Index: head/contrib/libgnuregex/regcomp.c =================================================================== --- head/contrib/libgnuregex/regcomp.c (revision 302831) +++ head/contrib/libgnuregex/regcomp.c (revision 302832) @@ -1,3860 +1,3851 @@ /* Extended regular expression matching and search library. Copyright (C) 2002-2007,2009,2010,2011,2012 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Isamu Hasegawa . The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see . */ static reg_errcode_t re_compile_internal (regex_t *preg, const char * pattern, size_t length, reg_syntax_t syntax); static void re_compile_fastmap_iter (regex_t *bufp, const re_dfastate_t *init_state, char *fastmap); static reg_errcode_t init_dfa (re_dfa_t *dfa, size_t pat_len); #ifdef RE_ENABLE_I18N static void free_charset (re_charset_t *cset); #endif /* RE_ENABLE_I18N */ static void free_workarea_compile (regex_t *preg); static reg_errcode_t create_initial_state (re_dfa_t *dfa); #ifdef RE_ENABLE_I18N static void optimize_utf8 (re_dfa_t *dfa); #endif static reg_errcode_t analyze (regex_t *preg); static reg_errcode_t preorder (bin_tree_t *root, reg_errcode_t (fn (void *, bin_tree_t *)), void *extra); static reg_errcode_t postorder (bin_tree_t *root, reg_errcode_t (fn (void *, bin_tree_t *)), void *extra); static reg_errcode_t optimize_subexps (void *extra, bin_tree_t *node); static reg_errcode_t lower_subexps (void *extra, bin_tree_t *node); static bin_tree_t *lower_subexp (reg_errcode_t *err, regex_t *preg, bin_tree_t *node); static reg_errcode_t calc_first (void *extra, bin_tree_t *node); static reg_errcode_t calc_next (void *extra, bin_tree_t *node); static reg_errcode_t link_nfa_nodes (void *extra, bin_tree_t *node); static int duplicate_node (re_dfa_t *dfa, int org_idx, unsigned int constraint); static int search_duplicated_node (const re_dfa_t *dfa, int org_node, unsigned int constraint); static reg_errcode_t calc_eclosure (re_dfa_t *dfa); static reg_errcode_t calc_eclosure_iter (re_node_set *new_set, re_dfa_t *dfa, int node, int root); static reg_errcode_t calc_inveclosure (re_dfa_t *dfa); static int fetch_number (re_string_t *input, re_token_t *token, reg_syntax_t syntax); static int peek_token (re_token_t *token, re_string_t *input, reg_syntax_t syntax) internal_function; static bin_tree_t *parse (re_string_t *regexp, regex_t *preg, reg_syntax_t syntax, reg_errcode_t *err); static bin_tree_t *parse_reg_exp (re_string_t *regexp, regex_t *preg, re_token_t *token, reg_syntax_t syntax, int nest, reg_errcode_t *err); static bin_tree_t *parse_branch (re_string_t *regexp, regex_t *preg, re_token_t *token, reg_syntax_t syntax, int nest, reg_errcode_t *err); static bin_tree_t *parse_expression (re_string_t *regexp, regex_t *preg, re_token_t *token, reg_syntax_t syntax, int nest, reg_errcode_t *err); static bin_tree_t *parse_sub_exp (re_string_t *regexp, regex_t *preg, re_token_t *token, reg_syntax_t syntax, int nest, reg_errcode_t *err); static bin_tree_t *parse_dup_op (bin_tree_t *dup_elem, re_string_t *regexp, re_dfa_t *dfa, re_token_t *token, reg_syntax_t syntax, reg_errcode_t *err); static bin_tree_t *parse_bracket_exp (re_string_t *regexp, re_dfa_t *dfa, re_token_t *token, reg_syntax_t syntax, reg_errcode_t *err); static reg_errcode_t parse_bracket_element (bracket_elem_t *elem, re_string_t *regexp, re_token_t *token, int token_len, re_dfa_t *dfa, reg_syntax_t syntax, int accept_hyphen); static reg_errcode_t parse_bracket_symbol (bracket_elem_t *elem, re_string_t *regexp, re_token_t *token); #ifdef RE_ENABLE_I18N static reg_errcode_t build_equiv_class (bitset_t sbcset, re_charset_t *mbcset, int *equiv_class_alloc, const unsigned char *name); static reg_errcode_t build_charclass (RE_TRANSLATE_TYPE trans, bitset_t sbcset, re_charset_t *mbcset, int *char_class_alloc, const unsigned char *class_name, reg_syntax_t syntax); #else /* not RE_ENABLE_I18N */ static reg_errcode_t build_equiv_class (bitset_t sbcset, const unsigned char *name); static reg_errcode_t build_charclass (RE_TRANSLATE_TYPE trans, bitset_t sbcset, const unsigned char *class_name, reg_syntax_t syntax); #endif /* not RE_ENABLE_I18N */ static bin_tree_t *build_charclass_op (re_dfa_t *dfa, RE_TRANSLATE_TYPE trans, const unsigned char *class_name, const unsigned char *extra, int non_match, reg_errcode_t *err); static bin_tree_t *create_tree (re_dfa_t *dfa, bin_tree_t *left, bin_tree_t *right, re_token_type_t type); static bin_tree_t *create_token_tree (re_dfa_t *dfa, bin_tree_t *left, bin_tree_t *right, const re_token_t *token); static bin_tree_t *duplicate_tree (const bin_tree_t *src, re_dfa_t *dfa); static void free_token (re_token_t *node); static reg_errcode_t free_tree (void *extra, bin_tree_t *node); static reg_errcode_t mark_opt_subexp (void *extra, bin_tree_t *node); /* This table gives an error message for each of the error codes listed in regex.h. Obviously the order here has to be same as there. POSIX doesn't require that we do anything for REG_NOERROR, but why not be nice? */ const char __re_error_msgid[] attribute_hidden = { #define REG_NOERROR_IDX 0 gettext_noop ("Success") /* REG_NOERROR */ "\0" #define REG_NOMATCH_IDX (REG_NOERROR_IDX + sizeof "Success") gettext_noop ("No match") /* REG_NOMATCH */ "\0" #define REG_BADPAT_IDX (REG_NOMATCH_IDX + sizeof "No match") gettext_noop ("Invalid regular expression") /* REG_BADPAT */ "\0" #define REG_ECOLLATE_IDX (REG_BADPAT_IDX + sizeof "Invalid regular expression") gettext_noop ("Invalid collation character") /* REG_ECOLLATE */ "\0" #define REG_ECTYPE_IDX (REG_ECOLLATE_IDX + sizeof "Invalid collation character") gettext_noop ("Invalid character class name") /* REG_ECTYPE */ "\0" #define REG_EESCAPE_IDX (REG_ECTYPE_IDX + sizeof "Invalid character class name") gettext_noop ("Trailing backslash") /* REG_EESCAPE */ "\0" #define REG_ESUBREG_IDX (REG_EESCAPE_IDX + sizeof "Trailing backslash") gettext_noop ("Invalid back reference") /* REG_ESUBREG */ "\0" #define REG_EBRACK_IDX (REG_ESUBREG_IDX + sizeof "Invalid back reference") gettext_noop ("Unmatched [ or [^") /* REG_EBRACK */ "\0" #define REG_EPAREN_IDX (REG_EBRACK_IDX + sizeof "Unmatched [ or [^") gettext_noop ("Unmatched ( or \\(") /* REG_EPAREN */ "\0" #define REG_EBRACE_IDX (REG_EPAREN_IDX + sizeof "Unmatched ( or \\(") gettext_noop ("Unmatched \\{") /* REG_EBRACE */ "\0" #define REG_BADBR_IDX (REG_EBRACE_IDX + sizeof "Unmatched \\{") gettext_noop ("Invalid content of \\{\\}") /* REG_BADBR */ "\0" #define REG_ERANGE_IDX (REG_BADBR_IDX + sizeof "Invalid content of \\{\\}") gettext_noop ("Invalid range end") /* REG_ERANGE */ "\0" #define REG_ESPACE_IDX (REG_ERANGE_IDX + sizeof "Invalid range end") gettext_noop ("Memory exhausted") /* REG_ESPACE */ "\0" #define REG_BADRPT_IDX (REG_ESPACE_IDX + sizeof "Memory exhausted") gettext_noop ("Invalid preceding regular expression") /* REG_BADRPT */ "\0" #define REG_EEND_IDX (REG_BADRPT_IDX + sizeof "Invalid preceding regular expression") gettext_noop ("Premature end of regular expression") /* REG_EEND */ "\0" #define REG_ESIZE_IDX (REG_EEND_IDX + sizeof "Premature end of regular expression") gettext_noop ("Regular expression too big") /* REG_ESIZE */ "\0" #define REG_ERPAREN_IDX (REG_ESIZE_IDX + sizeof "Regular expression too big") gettext_noop ("Unmatched ) or \\)") /* REG_ERPAREN */ }; const size_t __re_error_msgid_idx[] attribute_hidden = { REG_NOERROR_IDX, REG_NOMATCH_IDX, REG_BADPAT_IDX, REG_ECOLLATE_IDX, REG_ECTYPE_IDX, REG_EESCAPE_IDX, REG_ESUBREG_IDX, REG_EBRACK_IDX, REG_EPAREN_IDX, REG_EBRACE_IDX, REG_BADBR_IDX, REG_ERANGE_IDX, REG_ESPACE_IDX, REG_BADRPT_IDX, REG_EEND_IDX, REG_ESIZE_IDX, REG_ERPAREN_IDX }; /* Entry points for GNU code. */ /* re_compile_pattern is the GNU regular expression compiler: it compiles PATTERN (of length LENGTH) and puts the result in BUFP. Returns 0 if the pattern was valid, otherwise an error string. Assumes the `allocated' (and perhaps `buffer') and `translate' fields are set in BUFP on entry. */ const char * re_compile_pattern (pattern, length, bufp) const char *pattern; size_t length; struct re_pattern_buffer *bufp; { reg_errcode_t ret; /* And GNU code determines whether or not to get register information by passing null for the REGS argument to re_match, etc., not by setting no_sub, unless RE_NO_SUB is set. */ bufp->no_sub = !!(re_syntax_options & RE_NO_SUB); /* Match anchors at newline. */ bufp->newline_anchor = 1; ret = re_compile_internal (bufp, pattern, length, re_syntax_options); if (!ret) return NULL; return gettext (__re_error_msgid + __re_error_msgid_idx[(int) ret]); } #ifdef _LIBC weak_alias (__re_compile_pattern, re_compile_pattern) #endif /* Set by `re_set_syntax' to the current regexp syntax to recognize. Can also be assigned to arbitrarily: each pattern buffer stores its own syntax, so it can be changed between regex compilations. */ /* This has no initializer because initialized variables in Emacs become read-only after dumping. */ reg_syntax_t re_syntax_options; /* Specify the precise syntax of regexps for compilation. This provides for compatibility for various utilities which historically have different, incompatible syntaxes. The argument SYNTAX is a bit mask comprised of the various bits defined in regex.h. We return the old syntax. */ reg_syntax_t re_set_syntax (syntax) reg_syntax_t syntax; { reg_syntax_t ret = re_syntax_options; re_syntax_options = syntax; return ret; } #ifdef _LIBC weak_alias (__re_set_syntax, re_set_syntax) #endif int re_compile_fastmap (bufp) struct re_pattern_buffer *bufp; { re_dfa_t *dfa = (re_dfa_t *) bufp->buffer; char *fastmap = bufp->fastmap; memset (fastmap, '\0', sizeof (char) * SBC_MAX); re_compile_fastmap_iter (bufp, dfa->init_state, fastmap); if (dfa->init_state != dfa->init_state_word) re_compile_fastmap_iter (bufp, dfa->init_state_word, fastmap); if (dfa->init_state != dfa->init_state_nl) re_compile_fastmap_iter (bufp, dfa->init_state_nl, fastmap); if (dfa->init_state != dfa->init_state_begbuf) re_compile_fastmap_iter (bufp, dfa->init_state_begbuf, fastmap); bufp->fastmap_accurate = 1; return 0; } #ifdef _LIBC weak_alias (__re_compile_fastmap, re_compile_fastmap) #endif static inline void __attribute ((always_inline)) re_set_fastmap (char *fastmap, int icase, int ch) { fastmap[ch] = 1; if (icase) fastmap[tolower (ch)] = 1; } /* Helper function for re_compile_fastmap. Compile fastmap for the initial_state INIT_STATE. */ static void re_compile_fastmap_iter (regex_t *bufp, const re_dfastate_t *init_state, char *fastmap) { re_dfa_t *dfa = (re_dfa_t *) bufp->buffer; int node_cnt; int icase = (dfa->mb_cur_max == 1 && (bufp->syntax & RE_ICASE)); for (node_cnt = 0; node_cnt < init_state->nodes.nelem; ++node_cnt) { int node = init_state->nodes.elems[node_cnt]; re_token_type_t type = dfa->nodes[node].type; if (type == CHARACTER) { re_set_fastmap (fastmap, icase, dfa->nodes[node].opr.c); #ifdef RE_ENABLE_I18N if ((bufp->syntax & RE_ICASE) && dfa->mb_cur_max > 1) { unsigned char *buf = alloca (dfa->mb_cur_max), *p; wchar_t wc; mbstate_t state; p = buf; *p++ = dfa->nodes[node].opr.c; while (++node < dfa->nodes_len && dfa->nodes[node].type == CHARACTER && dfa->nodes[node].mb_partial) *p++ = dfa->nodes[node].opr.c; memset (&state, '\0', sizeof (state)); if (__mbrtowc (&wc, (const char *) buf, p - buf, &state) == p - buf && (__wcrtomb ((char *) buf, towlower (wc), &state) != (size_t) -1)) re_set_fastmap (fastmap, 0, buf[0]); } #endif } else if (type == SIMPLE_BRACKET) { int i, ch; for (i = 0, ch = 0; i < BITSET_WORDS; ++i) { int j; bitset_word_t w = dfa->nodes[node].opr.sbcset[i]; for (j = 0; j < BITSET_WORD_BITS; ++j, ++ch) if (w & ((bitset_word_t) 1 << j)) re_set_fastmap (fastmap, icase, ch); } } #ifdef RE_ENABLE_I18N else if (type == COMPLEX_BRACKET) { re_charset_t *cset = dfa->nodes[node].opr.mbcset; int i; # ifdef _LIBC /* See if we have to try all bytes which start multiple collation elements. e.g. In da_DK, we want to catch 'a' since "aa" is a valid collation element, and don't catch 'b' since 'b' is the only collation element which starts from 'b' (and it is caught by SIMPLE_BRACKET). */ if (_NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES) != 0 && (cset->ncoll_syms || cset->nranges)) { const int32_t *table = (const int32_t *) _NL_CURRENT (LC_COLLATE, _NL_COLLATE_TABLEMB); for (i = 0; i < SBC_MAX; ++i) if (table[i] < 0) re_set_fastmap (fastmap, icase, i); } # endif /* _LIBC */ /* See if we have to start the match at all multibyte characters, i.e. where we would not find an invalid sequence. This only applies to multibyte character sets; for single byte character sets, the SIMPLE_BRACKET again suffices. */ if (dfa->mb_cur_max > 1 && (cset->nchar_classes || cset->non_match || cset->nranges # ifdef _LIBC || cset->nequiv_classes # endif /* _LIBC */ )) { unsigned char c = 0; do { mbstate_t mbs; memset (&mbs, 0, sizeof (mbs)); if (__mbrtowc (NULL, (char *) &c, 1, &mbs) == (size_t) -2) re_set_fastmap (fastmap, false, (int) c); } while (++c != 0); } else { /* ... Else catch all bytes which can start the mbchars. */ for (i = 0; i < cset->nmbchars; ++i) { char buf[256]; mbstate_t state; memset (&state, '\0', sizeof (state)); if (__wcrtomb (buf, cset->mbchars[i], &state) != (size_t) -1) re_set_fastmap (fastmap, icase, *(unsigned char *) buf); if ((bufp->syntax & RE_ICASE) && dfa->mb_cur_max > 1) { if (__wcrtomb (buf, towlower (cset->mbchars[i]), &state) != (size_t) -1) re_set_fastmap (fastmap, false, *(unsigned char *) buf); } } } } #endif /* RE_ENABLE_I18N */ else if (type == OP_PERIOD #ifdef RE_ENABLE_I18N || type == OP_UTF8_PERIOD #endif /* RE_ENABLE_I18N */ || type == END_OF_RE) { memset (fastmap, '\1', sizeof (char) * SBC_MAX); if (type == END_OF_RE) bufp->can_be_null = 1; return; } } } /* Entry point for POSIX code. */ /* regcomp takes a regular expression as a string and compiles it. PREG is a regex_t *. We do not expect any fields to be initialized, since POSIX says we shouldn't. Thus, we set `buffer' to the compiled pattern; `used' to the length of the compiled pattern; `syntax' to RE_SYNTAX_POSIX_EXTENDED if the REG_EXTENDED bit in CFLAGS is set; otherwise, to RE_SYNTAX_POSIX_BASIC; `newline_anchor' to REG_NEWLINE being set in CFLAGS; `fastmap' to an allocated space for the fastmap; `fastmap_accurate' to zero; `re_nsub' to the number of subexpressions in PATTERN. PATTERN is the address of the pattern string. CFLAGS is a series of bits which affect compilation. If REG_EXTENDED is set, we use POSIX extended syntax; otherwise, we use POSIX basic syntax. If REG_NEWLINE is set, then . and [^...] don't match newline. Also, regexec will try a match beginning after every newline. If REG_ICASE is set, then we considers upper- and lowercase versions of letters to be equivalent when matching. If REG_NOSUB is set, then when PREG is passed to regexec, that routine will report only success or failure, and nothing about the registers. It returns 0 if it succeeds, nonzero if it doesn't. (See regex.h for the return codes and their meanings.) */ int regcomp (preg, pattern, cflags) regex_t *__restrict preg; const char *__restrict pattern; int cflags; { reg_errcode_t ret; reg_syntax_t syntax = ((cflags & REG_EXTENDED) ? RE_SYNTAX_POSIX_EXTENDED : RE_SYNTAX_POSIX_BASIC); preg->buffer = NULL; preg->allocated = 0; preg->used = 0; /* Try to allocate space for the fastmap. */ preg->fastmap = re_malloc (char, SBC_MAX); if (BE (preg->fastmap == NULL, 0)) return REG_ESPACE; syntax |= (cflags & REG_ICASE) ? RE_ICASE : 0; /* If REG_NEWLINE is set, newlines are treated differently. */ if (cflags & REG_NEWLINE) { /* REG_NEWLINE implies neither . nor [^...] match newline. */ syntax &= ~RE_DOT_NEWLINE; syntax |= RE_HAT_LISTS_NOT_NEWLINE; /* It also changes the matching behavior. */ preg->newline_anchor = 1; } else preg->newline_anchor = 0; preg->no_sub = !!(cflags & REG_NOSUB); preg->translate = NULL; ret = re_compile_internal (preg, pattern, strlen (pattern), syntax); /* POSIX doesn't distinguish between an unmatched open-group and an unmatched close-group: both are REG_EPAREN. */ if (ret == REG_ERPAREN) ret = REG_EPAREN; /* We have already checked preg->fastmap != NULL. */ if (BE (ret == REG_NOERROR, 1)) /* Compute the fastmap now, since regexec cannot modify the pattern buffer. This function never fails in this implementation. */ (void) re_compile_fastmap (preg); else { /* Some error occurred while compiling the expression. */ re_free (preg->fastmap); preg->fastmap = NULL; } return (int) ret; } #ifdef _LIBC weak_alias (__regcomp, regcomp) #endif /* Returns a message corresponding to an error code, ERRCODE, returned from either regcomp or regexec. We don't use PREG here. */ size_t regerror (errcode, preg, errbuf, errbuf_size) int errcode; const regex_t *__restrict preg; char *__restrict errbuf; size_t errbuf_size; { const char *msg; size_t msg_size; if (BE (errcode < 0 || errcode >= (int) (sizeof (__re_error_msgid_idx) / sizeof (__re_error_msgid_idx[0])), 0)) /* Only error codes returned by the rest of the code should be passed to this routine. If we are given anything else, or if other regex code generates an invalid error code, then the program has a bug. Dump core so we can fix it. */ abort (); msg = gettext (__re_error_msgid + __re_error_msgid_idx[errcode]); msg_size = strlen (msg) + 1; /* Includes the null. */ if (BE (errbuf_size != 0, 1)) { if (BE (msg_size > errbuf_size, 0)) { #if defined HAVE_MEMPCPY || defined _LIBC *((char *) __mempcpy (errbuf, msg, errbuf_size - 1)) = '\0'; #else memcpy (errbuf, msg, errbuf_size - 1); errbuf[errbuf_size - 1] = 0; #endif } else memcpy (errbuf, msg, msg_size); } return msg_size; } #ifdef _LIBC weak_alias (__regerror, regerror) #endif #ifdef RE_ENABLE_I18N /* This static array is used for the map to single-byte characters when UTF-8 is used. Otherwise we would allocate memory just to initialize it the same all the time. UTF-8 is the preferred encoding so this is a worthwhile optimization. */ static const bitset_t utf8_sb_map = { /* Set the first 128 bits. */ [0 ... 0x80 / BITSET_WORD_BITS - 1] = BITSET_WORD_MAX }; #endif static void free_dfa_content (re_dfa_t *dfa) { int i, j; if (dfa->nodes) for (i = 0; i < dfa->nodes_len; ++i) free_token (dfa->nodes + i); re_free (dfa->nexts); for (i = 0; i < dfa->nodes_len; ++i) { if (dfa->eclosures != NULL) re_node_set_free (dfa->eclosures + i); if (dfa->inveclosures != NULL) re_node_set_free (dfa->inveclosures + i); if (dfa->edests != NULL) re_node_set_free (dfa->edests + i); } re_free (dfa->edests); re_free (dfa->eclosures); re_free (dfa->inveclosures); re_free (dfa->nodes); if (dfa->state_table) for (i = 0; i <= dfa->state_hash_mask; ++i) { struct re_state_table_entry *entry = dfa->state_table + i; for (j = 0; j < entry->num; ++j) { re_dfastate_t *state = entry->array[j]; free_state (state); } re_free (entry->array); } re_free (dfa->state_table); #ifdef RE_ENABLE_I18N if (dfa->sb_char != utf8_sb_map) re_free (dfa->sb_char); #endif re_free (dfa->subexp_map); #ifdef DEBUG re_free (dfa->re_str); #endif re_free (dfa); } /* Free dynamically allocated space used by PREG. */ void regfree (preg) regex_t *preg; { re_dfa_t *dfa = (re_dfa_t *) preg->buffer; if (BE (dfa != NULL, 1)) free_dfa_content (dfa); preg->buffer = NULL; preg->allocated = 0; re_free (preg->fastmap); preg->fastmap = NULL; re_free (preg->translate); preg->translate = NULL; } #ifdef _LIBC weak_alias (__regfree, regfree) #endif /* Entry points compatible with 4.2 BSD regex library. We don't define them unless specifically requested. */ #if defined _REGEX_RE_COMP || defined _LIBC /* BSD has one and only one pattern buffer. */ static struct re_pattern_buffer re_comp_buf; char * # ifdef _LIBC /* Make these definitions weak in libc, so POSIX programs can redefine these names if they don't use our functions, and still use regcomp/regexec above without link errors. */ weak_function # endif re_comp (s) const char *s; { reg_errcode_t ret; char *fastmap; if (!s) { if (!re_comp_buf.buffer) return gettext ("No previous regular expression"); return 0; } if (re_comp_buf.buffer) { fastmap = re_comp_buf.fastmap; re_comp_buf.fastmap = NULL; __regfree (&re_comp_buf); memset (&re_comp_buf, '\0', sizeof (re_comp_buf)); re_comp_buf.fastmap = fastmap; } if (re_comp_buf.fastmap == NULL) { re_comp_buf.fastmap = (char *) malloc (SBC_MAX); if (re_comp_buf.fastmap == NULL) return (char *) gettext (__re_error_msgid + __re_error_msgid_idx[(int) REG_ESPACE]); } /* Since `re_exec' always passes NULL for the `regs' argument, we don't need to initialize the pattern buffer fields which affect it. */ /* Match anchors at newlines. */ re_comp_buf.newline_anchor = 1; ret = re_compile_internal (&re_comp_buf, s, strlen (s), re_syntax_options); if (!ret) return NULL; /* Yes, we're discarding `const' here if !HAVE_LIBINTL. */ return (char *) gettext (__re_error_msgid + __re_error_msgid_idx[(int) ret]); } #ifdef _LIBC libc_freeres_fn (free_mem) { __regfree (&re_comp_buf); } #endif #endif /* _REGEX_RE_COMP */ /* Internal entry point. Compile the regular expression PATTERN, whose length is LENGTH. SYNTAX indicate regular expression's syntax. */ static reg_errcode_t re_compile_internal (regex_t *preg, const char * pattern, size_t length, reg_syntax_t syntax) { reg_errcode_t err = REG_NOERROR; re_dfa_t *dfa; re_string_t regexp; /* Initialize the pattern buffer. */ preg->fastmap_accurate = 0; preg->syntax = syntax; preg->not_bol = preg->not_eol = 0; preg->used = 0; preg->re_nsub = 0; preg->can_be_null = 0; preg->regs_allocated = REGS_UNALLOCATED; /* Initialize the dfa. */ dfa = (re_dfa_t *) preg->buffer; if (BE (preg->allocated < sizeof (re_dfa_t), 0)) { /* If zero allocated, but buffer is non-null, try to realloc enough space. This loses if buffer's address is bogus, but that is the user's responsibility. If ->buffer is NULL this is a simple allocation. */ dfa = re_realloc (preg->buffer, re_dfa_t, 1); if (dfa == NULL) return REG_ESPACE; preg->allocated = sizeof (re_dfa_t); preg->buffer = (unsigned char *) dfa; } preg->used = sizeof (re_dfa_t); err = init_dfa (dfa, length); if (BE (err != REG_NOERROR, 0)) { free_dfa_content (dfa); preg->buffer = NULL; preg->allocated = 0; return err; } #ifdef DEBUG /* Note: length+1 will not overflow since it is checked in init_dfa. */ dfa->re_str = re_malloc (char, length + 1); strncpy (dfa->re_str, pattern, length + 1); #endif __libc_lock_init (dfa->lock); err = re_string_construct (®exp, pattern, length, preg->translate, syntax & RE_ICASE, dfa); if (BE (err != REG_NOERROR, 0)) { re_compile_internal_free_return: free_workarea_compile (preg); re_string_destruct (®exp); free_dfa_content (dfa); preg->buffer = NULL; preg->allocated = 0; return err; } /* Parse the regular expression, and build a structure tree. */ preg->re_nsub = 0; dfa->str_tree = parse (®exp, preg, syntax, &err); if (BE (dfa->str_tree == NULL, 0)) goto re_compile_internal_free_return; /* Analyze the tree and create the nfa. */ err = analyze (preg); if (BE (err != REG_NOERROR, 0)) goto re_compile_internal_free_return; #ifdef RE_ENABLE_I18N /* If possible, do searching in single byte encoding to speed things up. */ if (dfa->is_utf8 && !(syntax & RE_ICASE) && preg->translate == NULL) optimize_utf8 (dfa); #endif /* Then create the initial state of the dfa. */ err = create_initial_state (dfa); /* Release work areas. */ free_workarea_compile (preg); re_string_destruct (®exp); if (BE (err != REG_NOERROR, 0)) { free_dfa_content (dfa); preg->buffer = NULL; preg->allocated = 0; } return err; } /* Initialize DFA. We use the length of the regular expression PAT_LEN as the initial length of some arrays. */ static reg_errcode_t init_dfa (re_dfa_t *dfa, size_t pat_len) { unsigned int table_size; #ifndef _LIBC char *codeset_name; #endif memset (dfa, '\0', sizeof (re_dfa_t)); /* Force allocation of str_tree_storage the first time. */ dfa->str_tree_storage_idx = BIN_TREE_STORAGE_SIZE; /* Avoid overflows. */ if (pat_len == SIZE_MAX) return REG_ESPACE; dfa->nodes_alloc = pat_len + 1; dfa->nodes = re_malloc (re_token_t, dfa->nodes_alloc); /* table_size = 2 ^ ceil(log pat_len) */ for (table_size = 1; ; table_size <<= 1) if (table_size > pat_len) break; dfa->state_table = calloc (sizeof (struct re_state_table_entry), table_size); dfa->state_hash_mask = table_size - 1; dfa->mb_cur_max = MB_CUR_MAX; #ifdef _LIBC if (dfa->mb_cur_max == 6 && strcmp (_NL_CURRENT (LC_CTYPE, _NL_CTYPE_CODESET_NAME), "UTF-8") == 0) dfa->is_utf8 = 1; dfa->map_notascii = (_NL_CURRENT_WORD (LC_CTYPE, _NL_CTYPE_MAP_TO_NONASCII) != 0); #else # ifdef HAVE_LANGINFO_CODESET codeset_name = nl_langinfo (CODESET); # else codeset_name = getenv ("LC_ALL"); if (codeset_name == NULL || codeset_name[0] == '\0') codeset_name = getenv ("LC_CTYPE"); if (codeset_name == NULL || codeset_name[0] == '\0') codeset_name = getenv ("LANG"); if (codeset_name == NULL) codeset_name = ""; else if (strchr (codeset_name, '.') != NULL) codeset_name = strchr (codeset_name, '.') + 1; # endif if (strcasecmp (codeset_name, "UTF-8") == 0 || strcasecmp (codeset_name, "UTF8") == 0) dfa->is_utf8 = 1; /* We check exhaustively in the loop below if this charset is a superset of ASCII. */ dfa->map_notascii = 0; #endif #ifdef RE_ENABLE_I18N if (dfa->mb_cur_max > 1) { if (dfa->is_utf8) dfa->sb_char = (re_bitset_ptr_t) utf8_sb_map; else { int i, j, ch; dfa->sb_char = (re_bitset_ptr_t) calloc (sizeof (bitset_t), 1); if (BE (dfa->sb_char == NULL, 0)) return REG_ESPACE; /* Set the bits corresponding to single byte chars. */ for (i = 0, ch = 0; i < BITSET_WORDS; ++i) for (j = 0; j < BITSET_WORD_BITS; ++j, ++ch) { wint_t wch = __btowc (ch); if (wch != WEOF) dfa->sb_char[i] |= (bitset_word_t) 1 << j; # ifndef _LIBC if (isascii (ch) && wch != ch) dfa->map_notascii = 1; # endif } } } #endif if (BE (dfa->nodes == NULL || dfa->state_table == NULL, 0)) return REG_ESPACE; return REG_NOERROR; } /* Initialize WORD_CHAR table, which indicate which character is "word". In this case "word" means that it is the word construction character used by some operators like "\<", "\>", etc. */ static void internal_function init_word_char (re_dfa_t *dfa) { dfa->word_ops_used = 1; int i = 0; int ch = 0; if (BE (dfa->map_notascii == 0, 1)) { if (sizeof (dfa->word_char[0]) == 8) { /* The extra temporaries here avoid "implicitly truncated" warnings in the case when this is dead code, i.e. 32-bit. */ const uint64_t wc0 = UINT64_C (0x03ff000000000000); const uint64_t wc1 = UINT64_C (0x07fffffe87fffffe); dfa->word_char[0] = wc0; dfa->word_char[1] = wc1; i = 2; } else if (sizeof (dfa->word_char[0]) == 4) { dfa->word_char[0] = UINT32_C (0x00000000); dfa->word_char[1] = UINT32_C (0x03ff0000); dfa->word_char[2] = UINT32_C (0x87fffffe); dfa->word_char[3] = UINT32_C (0x07fffffe); i = 4; } else abort (); ch = 128; if (BE (dfa->is_utf8, 1)) { memset (&dfa->word_char[i], '\0', (SBC_MAX - ch) / 8); return; } } for (; i < BITSET_WORDS; ++i) for (int j = 0; j < BITSET_WORD_BITS; ++j, ++ch) if (isalnum (ch) || ch == '_') dfa->word_char[i] |= (bitset_word_t) 1 << j; } /* Free the work area which are only used while compiling. */ static void free_workarea_compile (regex_t *preg) { re_dfa_t *dfa = (re_dfa_t *) preg->buffer; bin_tree_storage_t *storage, *next; for (storage = dfa->str_tree_storage; storage; storage = next) { next = storage->next; re_free (storage); } dfa->str_tree_storage = NULL; dfa->str_tree_storage_idx = BIN_TREE_STORAGE_SIZE; dfa->str_tree = NULL; re_free (dfa->org_indices); dfa->org_indices = NULL; } /* Create initial states for all contexts. */ static reg_errcode_t create_initial_state (re_dfa_t *dfa) { int first, i; reg_errcode_t err; re_node_set init_nodes; /* Initial states have the epsilon closure of the node which is the first node of the regular expression. */ first = dfa->str_tree->first->node_idx; dfa->init_node = first; err = re_node_set_init_copy (&init_nodes, dfa->eclosures + first); if (BE (err != REG_NOERROR, 0)) return err; /* The back-references which are in initial states can epsilon transit, since in this case all of the subexpressions can be null. Then we add epsilon closures of the nodes which are the next nodes of the back-references. */ if (dfa->nbackref > 0) for (i = 0; i < init_nodes.nelem; ++i) { int node_idx = init_nodes.elems[i]; re_token_type_t type = dfa->nodes[node_idx].type; int clexp_idx; if (type != OP_BACK_REF) continue; for (clexp_idx = 0; clexp_idx < init_nodes.nelem; ++clexp_idx) { re_token_t *clexp_node; clexp_node = dfa->nodes + init_nodes.elems[clexp_idx]; if (clexp_node->type == OP_CLOSE_SUBEXP && clexp_node->opr.idx == dfa->nodes[node_idx].opr.idx) break; } if (clexp_idx == init_nodes.nelem) continue; if (type == OP_BACK_REF) { int dest_idx = dfa->edests[node_idx].elems[0]; if (!re_node_set_contains (&init_nodes, dest_idx)) { reg_errcode_t err = re_node_set_merge (&init_nodes, dfa->eclosures + dest_idx); if (err != REG_NOERROR) return err; i = 0; } } } /* It must be the first time to invoke acquire_state. */ dfa->init_state = re_acquire_state_context (&err, dfa, &init_nodes, 0); /* We don't check ERR here, since the initial state must not be NULL. */ if (BE (dfa->init_state == NULL, 0)) return err; if (dfa->init_state->has_constraint) { dfa->init_state_word = re_acquire_state_context (&err, dfa, &init_nodes, CONTEXT_WORD); dfa->init_state_nl = re_acquire_state_context (&err, dfa, &init_nodes, CONTEXT_NEWLINE); dfa->init_state_begbuf = re_acquire_state_context (&err, dfa, &init_nodes, CONTEXT_NEWLINE | CONTEXT_BEGBUF); if (BE (dfa->init_state_word == NULL || dfa->init_state_nl == NULL || dfa->init_state_begbuf == NULL, 0)) return err; } else dfa->init_state_word = dfa->init_state_nl = dfa->init_state_begbuf = dfa->init_state; re_node_set_free (&init_nodes); return REG_NOERROR; } #ifdef RE_ENABLE_I18N /* If it is possible to do searching in single byte encoding instead of UTF-8 to speed things up, set dfa->mb_cur_max to 1, clear is_utf8 and change DFA nodes where needed. */ static void optimize_utf8 (re_dfa_t *dfa) { int node, i, mb_chars = 0, has_period = 0; for (node = 0; node < dfa->nodes_len; ++node) switch (dfa->nodes[node].type) { case CHARACTER: if (dfa->nodes[node].opr.c >= 0x80) mb_chars = 1; break; case ANCHOR: switch (dfa->nodes[node].opr.ctx_type) { case LINE_FIRST: case LINE_LAST: case BUF_FIRST: case BUF_LAST: break; default: /* Word anchors etc. cannot be handled. It's okay to test opr.ctx_type since constraints (for all DFA nodes) are created by ORing one or more opr.ctx_type values. */ return; } break; case OP_PERIOD: has_period = 1; break; case OP_BACK_REF: case OP_ALT: case END_OF_RE: case OP_DUP_ASTERISK: case OP_OPEN_SUBEXP: case OP_CLOSE_SUBEXP: break; case COMPLEX_BRACKET: return; case SIMPLE_BRACKET: /* Just double check. The non-ASCII range starts at 0x80. */ assert (0x80 % BITSET_WORD_BITS == 0); for (i = 0x80 / BITSET_WORD_BITS; i < BITSET_WORDS; ++i) if (dfa->nodes[node].opr.sbcset[i]) return; break; default: abort (); } if (mb_chars || has_period) for (node = 0; node < dfa->nodes_len; ++node) { if (dfa->nodes[node].type == CHARACTER && dfa->nodes[node].opr.c >= 0x80) dfa->nodes[node].mb_partial = 0; else if (dfa->nodes[node].type == OP_PERIOD) dfa->nodes[node].type = OP_UTF8_PERIOD; } /* The search can be in single byte locale. */ dfa->mb_cur_max = 1; dfa->is_utf8 = 0; dfa->has_mb_node = dfa->nbackref > 0 || has_period; } #endif /* Analyze the structure tree, and calculate "first", "next", "edest", "eclosure", and "inveclosure". */ static reg_errcode_t analyze (regex_t *preg) { re_dfa_t *dfa = (re_dfa_t *) preg->buffer; reg_errcode_t ret; /* Allocate arrays. */ dfa->nexts = re_malloc (int, dfa->nodes_alloc); dfa->org_indices = re_malloc (int, dfa->nodes_alloc); dfa->edests = re_malloc (re_node_set, dfa->nodes_alloc); dfa->eclosures = re_malloc (re_node_set, dfa->nodes_alloc); if (BE (dfa->nexts == NULL || dfa->org_indices == NULL || dfa->edests == NULL || dfa->eclosures == NULL, 0)) return REG_ESPACE; dfa->subexp_map = re_malloc (int, preg->re_nsub); if (dfa->subexp_map != NULL) { int i; for (i = 0; i < preg->re_nsub; i++) dfa->subexp_map[i] = i; preorder (dfa->str_tree, optimize_subexps, dfa); for (i = 0; i < preg->re_nsub; i++) if (dfa->subexp_map[i] != i) break; if (i == preg->re_nsub) { free (dfa->subexp_map); dfa->subexp_map = NULL; } } ret = postorder (dfa->str_tree, lower_subexps, preg); if (BE (ret != REG_NOERROR, 0)) return ret; ret = postorder (dfa->str_tree, calc_first, dfa); if (BE (ret != REG_NOERROR, 0)) return ret; preorder (dfa->str_tree, calc_next, dfa); ret = preorder (dfa->str_tree, link_nfa_nodes, dfa); if (BE (ret != REG_NOERROR, 0)) return ret; ret = calc_eclosure (dfa); if (BE (ret != REG_NOERROR, 0)) return ret; /* We only need this during the prune_impossible_nodes pass in regexec.c; skip it if p_i_n will not run, as calc_inveclosure can be quadratic. */ if ((!preg->no_sub && preg->re_nsub > 0 && dfa->has_plural_match) || dfa->nbackref) { dfa->inveclosures = re_malloc (re_node_set, dfa->nodes_len); if (BE (dfa->inveclosures == NULL, 0)) return REG_ESPACE; ret = calc_inveclosure (dfa); } return ret; } /* Our parse trees are very unbalanced, so we cannot use a stack to implement parse tree visits. Instead, we use parent pointers and some hairy code in these two functions. */ static reg_errcode_t postorder (bin_tree_t *root, reg_errcode_t (fn (void *, bin_tree_t *)), void *extra) { bin_tree_t *node, *prev; for (node = root; ; ) { /* Descend down the tree, preferably to the left (or to the right if that's the only child). */ while (node->left || node->right) if (node->left) node = node->left; else node = node->right; do { reg_errcode_t err = fn (extra, node); if (BE (err != REG_NOERROR, 0)) return err; if (node->parent == NULL) return REG_NOERROR; prev = node; node = node->parent; } /* Go up while we have a node that is reached from the right. */ while (node->right == prev || node->right == NULL); node = node->right; } } static reg_errcode_t preorder (bin_tree_t *root, reg_errcode_t (fn (void *, bin_tree_t *)), void *extra) { bin_tree_t *node; for (node = root; ; ) { reg_errcode_t err = fn (extra, node); if (BE (err != REG_NOERROR, 0)) return err; /* Go to the left node, or up and to the right. */ if (node->left) node = node->left; else { bin_tree_t *prev = NULL; while (node->right == prev || node->right == NULL) { prev = node; node = node->parent; if (!node) return REG_NOERROR; } node = node->right; } } } /* Optimization pass: if a SUBEXP is entirely contained, strip it and tell re_search_internal to map the inner one's opr.idx to this one's. Adjust backreferences as well. Requires a preorder visit. */ static reg_errcode_t optimize_subexps (void *extra, bin_tree_t *node) { re_dfa_t *dfa = (re_dfa_t *) extra; if (node->token.type == OP_BACK_REF && dfa->subexp_map) { int idx = node->token.opr.idx; node->token.opr.idx = dfa->subexp_map[idx]; dfa->used_bkref_map |= 1 << node->token.opr.idx; } else if (node->token.type == SUBEXP && node->left && node->left->token.type == SUBEXP) { int other_idx = node->left->token.opr.idx; node->left = node->left->left; if (node->left) node->left->parent = node; dfa->subexp_map[other_idx] = dfa->subexp_map[node->token.opr.idx]; if (other_idx < BITSET_WORD_BITS) dfa->used_bkref_map &= ~((bitset_word_t) 1 << other_idx); } return REG_NOERROR; } /* Lowering pass: Turn each SUBEXP node into the appropriate concatenation of OP_OPEN_SUBEXP, the body of the SUBEXP (if any) and OP_CLOSE_SUBEXP. */ static reg_errcode_t lower_subexps (void *extra, bin_tree_t *node) { regex_t *preg = (regex_t *) extra; reg_errcode_t err = REG_NOERROR; if (node->left && node->left->token.type == SUBEXP) { node->left = lower_subexp (&err, preg, node->left); if (node->left) node->left->parent = node; } if (node->right && node->right->token.type == SUBEXP) { node->right = lower_subexp (&err, preg, node->right); if (node->right) node->right->parent = node; } return err; } static bin_tree_t * lower_subexp (reg_errcode_t *err, regex_t *preg, bin_tree_t *node) { re_dfa_t *dfa = (re_dfa_t *) preg->buffer; bin_tree_t *body = node->left; bin_tree_t *op, *cls, *tree1, *tree; if (preg->no_sub /* We do not optimize empty subexpressions, because otherwise we may have bad CONCAT nodes with NULL children. This is obviously not very common, so we do not lose much. An example that triggers this case is the sed "script" /\(\)/x. */ && node->left != NULL && (node->token.opr.idx >= BITSET_WORD_BITS || !(dfa->used_bkref_map & ((bitset_word_t) 1 << node->token.opr.idx)))) return node->left; /* Convert the SUBEXP node to the concatenation of an OP_OPEN_SUBEXP, the contents, and an OP_CLOSE_SUBEXP. */ op = create_tree (dfa, NULL, NULL, OP_OPEN_SUBEXP); cls = create_tree (dfa, NULL, NULL, OP_CLOSE_SUBEXP); tree1 = body ? create_tree (dfa, body, cls, CONCAT) : cls; tree = create_tree (dfa, op, tree1, CONCAT); if (BE (tree == NULL || tree1 == NULL || op == NULL || cls == NULL, 0)) { *err = REG_ESPACE; return NULL; } op->token.opr.idx = cls->token.opr.idx = node->token.opr.idx; op->token.opt_subexp = cls->token.opt_subexp = node->token.opt_subexp; return tree; } /* Pass 1 in building the NFA: compute FIRST and create unlinked automaton nodes. Requires a postorder visit. */ static reg_errcode_t calc_first (void *extra, bin_tree_t *node) { re_dfa_t *dfa = (re_dfa_t *) extra; if (node->token.type == CONCAT) { node->first = node->left->first; node->node_idx = node->left->node_idx; } else { node->first = node; node->node_idx = re_dfa_add_node (dfa, node->token); if (BE (node->node_idx == -1, 0)) return REG_ESPACE; if (node->token.type == ANCHOR) dfa->nodes[node->node_idx].constraint = node->token.opr.ctx_type; } return REG_NOERROR; } /* Pass 2: compute NEXT on the tree. Preorder visit. */ static reg_errcode_t calc_next (void *extra, bin_tree_t *node) { switch (node->token.type) { case OP_DUP_ASTERISK: node->left->next = node; break; case CONCAT: node->left->next = node->right->first; node->right->next = node->next; break; default: if (node->left) node->left->next = node->next; if (node->right) node->right->next = node->next; break; } return REG_NOERROR; } /* Pass 3: link all DFA nodes to their NEXT node (any order will do). */ static reg_errcode_t link_nfa_nodes (void *extra, bin_tree_t *node) { re_dfa_t *dfa = (re_dfa_t *) extra; int idx = node->node_idx; reg_errcode_t err = REG_NOERROR; switch (node->token.type) { case CONCAT: break; case END_OF_RE: assert (node->next == NULL); break; case OP_DUP_ASTERISK: case OP_ALT: { int left, right; dfa->has_plural_match = 1; if (node->left != NULL) left = node->left->first->node_idx; else left = node->next->node_idx; if (node->right != NULL) right = node->right->first->node_idx; else right = node->next->node_idx; assert (left > -1); assert (right > -1); err = re_node_set_init_2 (dfa->edests + idx, left, right); } break; case ANCHOR: case OP_OPEN_SUBEXP: case OP_CLOSE_SUBEXP: err = re_node_set_init_1 (dfa->edests + idx, node->next->node_idx); break; case OP_BACK_REF: dfa->nexts[idx] = node->next->node_idx; if (node->token.type == OP_BACK_REF) err = re_node_set_init_1 (dfa->edests + idx, dfa->nexts[idx]); break; default: assert (!IS_EPSILON_NODE (node->token.type)); dfa->nexts[idx] = node->next->node_idx; break; } return err; } /* Duplicate the epsilon closure of the node ROOT_NODE. Note that duplicated nodes have constraint INIT_CONSTRAINT in addition to their own constraint. */ static reg_errcode_t internal_function duplicate_node_closure (re_dfa_t *dfa, int top_org_node, int top_clone_node, int root_node, unsigned int init_constraint) { int org_node, clone_node, ret; unsigned int constraint = init_constraint; for (org_node = top_org_node, clone_node = top_clone_node;;) { int org_dest, clone_dest; if (dfa->nodes[org_node].type == OP_BACK_REF) { /* If the back reference epsilon-transit, its destination must also have the constraint. Then duplicate the epsilon closure of the destination of the back reference, and store it in edests of the back reference. */ org_dest = dfa->nexts[org_node]; re_node_set_empty (dfa->edests + clone_node); clone_dest = duplicate_node (dfa, org_dest, constraint); if (BE (clone_dest == -1, 0)) return REG_ESPACE; dfa->nexts[clone_node] = dfa->nexts[org_node]; ret = re_node_set_insert (dfa->edests + clone_node, clone_dest); if (BE (ret < 0, 0)) return REG_ESPACE; } else if (dfa->edests[org_node].nelem == 0) { /* In case of the node can't epsilon-transit, don't duplicate the destination and store the original destination as the destination of the node. */ dfa->nexts[clone_node] = dfa->nexts[org_node]; break; } else if (dfa->edests[org_node].nelem == 1) { /* In case of the node can epsilon-transit, and it has only one destination. */ org_dest = dfa->edests[org_node].elems[0]; re_node_set_empty (dfa->edests + clone_node); /* If the node is root_node itself, it means the epsilon clsoure has a loop. Then tie it to the destination of the root_node. */ if (org_node == root_node && clone_node != org_node) { ret = re_node_set_insert (dfa->edests + clone_node, org_dest); if (BE (ret < 0, 0)) return REG_ESPACE; break; } /* In case of the node has another constraint, add it. */ constraint |= dfa->nodes[org_node].constraint; clone_dest = duplicate_node (dfa, org_dest, constraint); if (BE (clone_dest == -1, 0)) return REG_ESPACE; ret = re_node_set_insert (dfa->edests + clone_node, clone_dest); if (BE (ret < 0, 0)) return REG_ESPACE; } else /* dfa->edests[org_node].nelem == 2 */ { /* In case of the node can epsilon-transit, and it has two destinations. In the bin_tree_t and DFA, that's '|' and '*'. */ org_dest = dfa->edests[org_node].elems[0]; re_node_set_empty (dfa->edests + clone_node); /* Search for a duplicated node which satisfies the constraint. */ clone_dest = search_duplicated_node (dfa, org_dest, constraint); if (clone_dest == -1) { /* There is no such duplicated node, create a new one. */ reg_errcode_t err; clone_dest = duplicate_node (dfa, org_dest, constraint); if (BE (clone_dest == -1, 0)) return REG_ESPACE; ret = re_node_set_insert (dfa->edests + clone_node, clone_dest); if (BE (ret < 0, 0)) return REG_ESPACE; err = duplicate_node_closure (dfa, org_dest, clone_dest, root_node, constraint); if (BE (err != REG_NOERROR, 0)) return err; } else { /* There is a duplicated node which satisfies the constraint, use it to avoid infinite loop. */ ret = re_node_set_insert (dfa->edests + clone_node, clone_dest); if (BE (ret < 0, 0)) return REG_ESPACE; } org_dest = dfa->edests[org_node].elems[1]; clone_dest = duplicate_node (dfa, org_dest, constraint); if (BE (clone_dest == -1, 0)) return REG_ESPACE; ret = re_node_set_insert (dfa->edests + clone_node, clone_dest); if (BE (ret < 0, 0)) return REG_ESPACE; } org_node = org_dest; clone_node = clone_dest; } return REG_NOERROR; } /* Search for a node which is duplicated from the node ORG_NODE, and satisfies the constraint CONSTRAINT. */ static int search_duplicated_node (const re_dfa_t *dfa, int org_node, unsigned int constraint) { int idx; for (idx = dfa->nodes_len - 1; dfa->nodes[idx].duplicated && idx > 0; --idx) { if (org_node == dfa->org_indices[idx] && constraint == dfa->nodes[idx].constraint) return idx; /* Found. */ } return -1; /* Not found. */ } /* Duplicate the node whose index is ORG_IDX and set the constraint CONSTRAINT. Return the index of the new node, or -1 if insufficient storage is available. */ static int duplicate_node (re_dfa_t *dfa, int org_idx, unsigned int constraint) { int dup_idx = re_dfa_add_node (dfa, dfa->nodes[org_idx]); if (BE (dup_idx != -1, 1)) { dfa->nodes[dup_idx].constraint = constraint; dfa->nodes[dup_idx].constraint |= dfa->nodes[org_idx].constraint; dfa->nodes[dup_idx].duplicated = 1; /* Store the index of the original node. */ dfa->org_indices[dup_idx] = org_idx; } return dup_idx; } static reg_errcode_t calc_inveclosure (re_dfa_t *dfa) { int src, idx, ret; for (idx = 0; idx < dfa->nodes_len; ++idx) re_node_set_init_empty (dfa->inveclosures + idx); for (src = 0; src < dfa->nodes_len; ++src) { int *elems = dfa->eclosures[src].elems; for (idx = 0; idx < dfa->eclosures[src].nelem; ++idx) { ret = re_node_set_insert_last (dfa->inveclosures + elems[idx], src); if (BE (ret == -1, 0)) return REG_ESPACE; } } return REG_NOERROR; } /* Calculate "eclosure" for all the node in DFA. */ static reg_errcode_t calc_eclosure (re_dfa_t *dfa) { int node_idx, incomplete; #ifdef DEBUG assert (dfa->nodes_len > 0); #endif incomplete = 0; /* For each nodes, calculate epsilon closure. */ for (node_idx = 0; ; ++node_idx) { reg_errcode_t err; re_node_set eclosure_elem; if (node_idx == dfa->nodes_len) { if (!incomplete) break; incomplete = 0; node_idx = 0; } #ifdef DEBUG assert (dfa->eclosures[node_idx].nelem != -1); #endif /* If we have already calculated, skip it. */ if (dfa->eclosures[node_idx].nelem != 0) continue; /* Calculate epsilon closure of `node_idx'. */ err = calc_eclosure_iter (&eclosure_elem, dfa, node_idx, 1); if (BE (err != REG_NOERROR, 0)) return err; if (dfa->eclosures[node_idx].nelem == 0) { incomplete = 1; re_node_set_free (&eclosure_elem); } } return REG_NOERROR; } /* Calculate epsilon closure of NODE. */ static reg_errcode_t calc_eclosure_iter (re_node_set *new_set, re_dfa_t *dfa, int node, int root) { reg_errcode_t err; int i; re_node_set eclosure; int ret; int incomplete = 0; err = re_node_set_alloc (&eclosure, dfa->edests[node].nelem + 1); if (BE (err != REG_NOERROR, 0)) return err; /* This indicates that we are calculating this node now. We reference this value to avoid infinite loop. */ dfa->eclosures[node].nelem = -1; /* If the current node has constraints, duplicate all nodes since they must inherit the constraints. */ if (dfa->nodes[node].constraint && dfa->edests[node].nelem && !dfa->nodes[dfa->edests[node].elems[0]].duplicated) { err = duplicate_node_closure (dfa, node, node, node, dfa->nodes[node].constraint); if (BE (err != REG_NOERROR, 0)) return err; } /* Expand each epsilon destination nodes. */ if (IS_EPSILON_NODE(dfa->nodes[node].type)) for (i = 0; i < dfa->edests[node].nelem; ++i) { re_node_set eclosure_elem; int edest = dfa->edests[node].elems[i]; /* If calculating the epsilon closure of `edest' is in progress, return intermediate result. */ if (dfa->eclosures[edest].nelem == -1) { incomplete = 1; continue; } /* If we haven't calculated the epsilon closure of `edest' yet, calculate now. Otherwise use calculated epsilon closure. */ if (dfa->eclosures[edest].nelem == 0) { err = calc_eclosure_iter (&eclosure_elem, dfa, edest, 0); if (BE (err != REG_NOERROR, 0)) return err; } else eclosure_elem = dfa->eclosures[edest]; /* Merge the epsilon closure of `edest'. */ err = re_node_set_merge (&eclosure, &eclosure_elem); if (BE (err != REG_NOERROR, 0)) return err; /* If the epsilon closure of `edest' is incomplete, the epsilon closure of this node is also incomplete. */ if (dfa->eclosures[edest].nelem == 0) { incomplete = 1; re_node_set_free (&eclosure_elem); } } /* An epsilon closure includes itself. */ ret = re_node_set_insert (&eclosure, node); if (BE (ret < 0, 0)) return REG_ESPACE; if (incomplete && !root) dfa->eclosures[node].nelem = 0; else dfa->eclosures[node] = eclosure; *new_set = eclosure; return REG_NOERROR; } /* Functions for token which are used in the parser. */ /* Fetch a token from INPUT. We must not use this function inside bracket expressions. */ static void internal_function fetch_token (re_token_t *result, re_string_t *input, reg_syntax_t syntax) { re_string_skip_bytes (input, peek_token (result, input, syntax)); } /* Peek a token from INPUT, and return the length of the token. We must not use this function inside bracket expressions. */ static int internal_function peek_token (re_token_t *token, re_string_t *input, reg_syntax_t syntax) { unsigned char c; if (re_string_eoi (input)) { token->type = END_OF_RE; return 0; } c = re_string_peek_byte (input, 0); token->opr.c = c; token->word_char = 0; #ifdef RE_ENABLE_I18N token->mb_partial = 0; if (input->mb_cur_max > 1 && !re_string_first_byte (input, re_string_cur_idx (input))) { token->type = CHARACTER; token->mb_partial = 1; return 1; } #endif if (c == '\\') { unsigned char c2; if (re_string_cur_idx (input) + 1 >= re_string_length (input)) { token->type = BACK_SLASH; return 1; } c2 = re_string_peek_byte_case (input, 1); token->opr.c = c2; token->type = CHARACTER; #ifdef RE_ENABLE_I18N if (input->mb_cur_max > 1) { wint_t wc = re_string_wchar_at (input, re_string_cur_idx (input) + 1); token->word_char = IS_WIDE_WORD_CHAR (wc) != 0; } else #endif token->word_char = IS_WORD_CHAR (c2) != 0; switch (c2) { case '|': if (!(syntax & RE_LIMITED_OPS) && !(syntax & RE_NO_BK_VBAR)) token->type = OP_ALT; break; case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': if (!(syntax & RE_NO_BK_REFS)) { token->type = OP_BACK_REF; token->opr.idx = c2 - '1'; } break; case '<': if (!(syntax & RE_NO_GNU_OPS)) { token->type = ANCHOR; token->opr.ctx_type = WORD_FIRST; } break; case '>': if (!(syntax & RE_NO_GNU_OPS)) { token->type = ANCHOR; token->opr.ctx_type = WORD_LAST; } break; case 'b': if (!(syntax & RE_NO_GNU_OPS)) { token->type = ANCHOR; token->opr.ctx_type = WORD_DELIM; } break; case 'B': if (!(syntax & RE_NO_GNU_OPS)) { token->type = ANCHOR; token->opr.ctx_type = NOT_WORD_DELIM; } break; case 'w': if (!(syntax & RE_NO_GNU_OPS)) token->type = OP_WORD; break; case 'W': if (!(syntax & RE_NO_GNU_OPS)) token->type = OP_NOTWORD; break; case 's': if (!(syntax & RE_NO_GNU_OPS)) token->type = OP_SPACE; break; case 'S': if (!(syntax & RE_NO_GNU_OPS)) token->type = OP_NOTSPACE; break; case '`': if (!(syntax & RE_NO_GNU_OPS)) { token->type = ANCHOR; token->opr.ctx_type = BUF_FIRST; } break; case '\'': if (!(syntax & RE_NO_GNU_OPS)) { token->type = ANCHOR; token->opr.ctx_type = BUF_LAST; } break; case '(': if (!(syntax & RE_NO_BK_PARENS)) token->type = OP_OPEN_SUBEXP; break; case ')': if (!(syntax & RE_NO_BK_PARENS)) token->type = OP_CLOSE_SUBEXP; break; case '+': if (!(syntax & RE_LIMITED_OPS) && (syntax & RE_BK_PLUS_QM)) token->type = OP_DUP_PLUS; break; case '?': if (!(syntax & RE_LIMITED_OPS) && (syntax & RE_BK_PLUS_QM)) token->type = OP_DUP_QUESTION; break; case '{': if ((syntax & RE_INTERVALS) && (!(syntax & RE_NO_BK_BRACES))) token->type = OP_OPEN_DUP_NUM; break; case '}': if ((syntax & RE_INTERVALS) && (!(syntax & RE_NO_BK_BRACES))) token->type = OP_CLOSE_DUP_NUM; break; default: break; } return 2; } token->type = CHARACTER; #ifdef RE_ENABLE_I18N if (input->mb_cur_max > 1) { wint_t wc = re_string_wchar_at (input, re_string_cur_idx (input)); token->word_char = IS_WIDE_WORD_CHAR (wc) != 0; } else #endif token->word_char = IS_WORD_CHAR (token->opr.c); switch (c) { case '\n': if (syntax & RE_NEWLINE_ALT) token->type = OP_ALT; break; case '|': if (!(syntax & RE_LIMITED_OPS) && (syntax & RE_NO_BK_VBAR)) token->type = OP_ALT; break; case '*': token->type = OP_DUP_ASTERISK; break; case '+': if (!(syntax & RE_LIMITED_OPS) && !(syntax & RE_BK_PLUS_QM)) token->type = OP_DUP_PLUS; break; case '?': if (!(syntax & RE_LIMITED_OPS) && !(syntax & RE_BK_PLUS_QM)) token->type = OP_DUP_QUESTION; break; case '{': if ((syntax & RE_INTERVALS) && (syntax & RE_NO_BK_BRACES)) token->type = OP_OPEN_DUP_NUM; break; case '}': if ((syntax & RE_INTERVALS) && (syntax & RE_NO_BK_BRACES)) token->type = OP_CLOSE_DUP_NUM; break; case '(': if (syntax & RE_NO_BK_PARENS) token->type = OP_OPEN_SUBEXP; break; case ')': if (syntax & RE_NO_BK_PARENS) token->type = OP_CLOSE_SUBEXP; break; case '[': token->type = OP_OPEN_BRACKET; break; case '.': token->type = OP_PERIOD; break; case '^': if (!(syntax & (RE_CONTEXT_INDEP_ANCHORS | RE_CARET_ANCHORS_HERE)) && re_string_cur_idx (input) != 0) { char prev = re_string_peek_byte (input, -1); if (!(syntax & RE_NEWLINE_ALT) || prev != '\n') break; } token->type = ANCHOR; token->opr.ctx_type = LINE_FIRST; break; case '$': if (!(syntax & RE_CONTEXT_INDEP_ANCHORS) && re_string_cur_idx (input) + 1 != re_string_length (input)) { re_token_t next; re_string_skip_bytes (input, 1); peek_token (&next, input, syntax); re_string_skip_bytes (input, -1); if (next.type != OP_ALT && next.type != OP_CLOSE_SUBEXP) break; } token->type = ANCHOR; token->opr.ctx_type = LINE_LAST; break; default: break; } return 1; } /* Peek a token from INPUT, and return the length of the token. We must not use this function out of bracket expressions. */ static int internal_function peek_token_bracket (re_token_t *token, re_string_t *input, reg_syntax_t syntax) { unsigned char c; if (re_string_eoi (input)) { token->type = END_OF_RE; return 0; } c = re_string_peek_byte (input, 0); token->opr.c = c; #ifdef RE_ENABLE_I18N if (input->mb_cur_max > 1 && !re_string_first_byte (input, re_string_cur_idx (input))) { token->type = CHARACTER; return 1; } #endif /* RE_ENABLE_I18N */ if (c == '\\' && (syntax & RE_BACKSLASH_ESCAPE_IN_LISTS) && re_string_cur_idx (input) + 1 < re_string_length (input)) { /* In this case, '\' escape a character. */ unsigned char c2; re_string_skip_bytes (input, 1); c2 = re_string_peek_byte (input, 0); token->opr.c = c2; token->type = CHARACTER; return 1; } if (c == '[') /* '[' is a special char in a bracket exps. */ { unsigned char c2; int token_len; if (re_string_cur_idx (input) + 1 < re_string_length (input)) c2 = re_string_peek_byte (input, 1); else c2 = 0; token->opr.c = c2; token_len = 2; switch (c2) { case '.': token->type = OP_OPEN_COLL_ELEM; break; case '=': token->type = OP_OPEN_EQUIV_CLASS; break; case ':': if (syntax & RE_CHAR_CLASSES) { token->type = OP_OPEN_CHAR_CLASS; break; } /* else fall through. */ default: token->type = CHARACTER; token->opr.c = c; token_len = 1; break; } return token_len; } switch (c) { case '-': token->type = OP_CHARSET_RANGE; break; case ']': token->type = OP_CLOSE_BRACKET; break; case '^': token->type = OP_NON_MATCH_LIST; break; default: token->type = CHARACTER; } return 1; } /* Functions for parser. */ /* Entry point of the parser. Parse the regular expression REGEXP and return the structure tree. If an error is occured, ERR is set by error code, and return NULL. This function build the following tree, from regular expression : CAT / \ / \ EOR CAT means concatenation. EOR means end of regular expression. */ static bin_tree_t * parse (re_string_t *regexp, regex_t *preg, reg_syntax_t syntax, reg_errcode_t *err) { re_dfa_t *dfa = (re_dfa_t *) preg->buffer; bin_tree_t *tree, *eor, *root; re_token_t current_token; dfa->syntax = syntax; fetch_token (¤t_token, regexp, syntax | RE_CARET_ANCHORS_HERE); tree = parse_reg_exp (regexp, preg, ¤t_token, syntax, 0, err); if (BE (*err != REG_NOERROR && tree == NULL, 0)) return NULL; eor = create_tree (dfa, NULL, NULL, END_OF_RE); if (tree != NULL) root = create_tree (dfa, tree, eor, CONCAT); else root = eor; if (BE (eor == NULL || root == NULL, 0)) { *err = REG_ESPACE; return NULL; } return root; } /* This function build the following tree, from regular expression |: ALT / \ / \ ALT means alternative, which represents the operator `|'. */ static bin_tree_t * parse_reg_exp (re_string_t *regexp, regex_t *preg, re_token_t *token, reg_syntax_t syntax, int nest, reg_errcode_t *err) { re_dfa_t *dfa = (re_dfa_t *) preg->buffer; bin_tree_t *tree, *branch = NULL; tree = parse_branch (regexp, preg, token, syntax, nest, err); if (BE (*err != REG_NOERROR && tree == NULL, 0)) return NULL; while (token->type == OP_ALT) { fetch_token (token, regexp, syntax | RE_CARET_ANCHORS_HERE); if (token->type != OP_ALT && token->type != END_OF_RE && (nest == 0 || token->type != OP_CLOSE_SUBEXP)) { branch = parse_branch (regexp, preg, token, syntax, nest, err); if (BE (*err != REG_NOERROR && branch == NULL, 0)) return NULL; } else branch = NULL; tree = create_tree (dfa, tree, branch, OP_ALT); if (BE (tree == NULL, 0)) { *err = REG_ESPACE; return NULL; } } return tree; } /* This function build the following tree, from regular expression : CAT / \ / \ CAT means concatenation. */ static bin_tree_t * parse_branch (re_string_t *regexp, regex_t *preg, re_token_t *token, reg_syntax_t syntax, int nest, reg_errcode_t *err) { bin_tree_t *tree, *exp; re_dfa_t *dfa = (re_dfa_t *) preg->buffer; tree = parse_expression (regexp, preg, token, syntax, nest, err); if (BE (*err != REG_NOERROR && tree == NULL, 0)) return NULL; while (token->type != OP_ALT && token->type != END_OF_RE && (nest == 0 || token->type != OP_CLOSE_SUBEXP)) { exp = parse_expression (regexp, preg, token, syntax, nest, err); if (BE (*err != REG_NOERROR && exp == NULL, 0)) { if (tree != NULL) postorder (tree, free_tree, NULL); return NULL; } if (tree != NULL && exp != NULL) { bin_tree_t *newtree = create_tree (dfa, tree, exp, CONCAT); if (newtree == NULL) { postorder (exp, free_tree, NULL); postorder (tree, free_tree, NULL); *err = REG_ESPACE; return NULL; } tree = newtree; } else if (tree == NULL) tree = exp; /* Otherwise exp == NULL, we don't need to create new tree. */ } return tree; } /* This function build the following tree, from regular expression a*: * | a */ static bin_tree_t * parse_expression (re_string_t *regexp, regex_t *preg, re_token_t *token, reg_syntax_t syntax, int nest, reg_errcode_t *err) { re_dfa_t *dfa = (re_dfa_t *) preg->buffer; bin_tree_t *tree; switch (token->type) { case CHARACTER: tree = create_token_tree (dfa, NULL, NULL, token); if (BE (tree == NULL, 0)) { *err = REG_ESPACE; return NULL; } #ifdef RE_ENABLE_I18N if (dfa->mb_cur_max > 1) { while (!re_string_eoi (regexp) && !re_string_first_byte (regexp, re_string_cur_idx (regexp))) { bin_tree_t *mbc_remain; fetch_token (token, regexp, syntax); mbc_remain = create_token_tree (dfa, NULL, NULL, token); tree = create_tree (dfa, tree, mbc_remain, CONCAT); if (BE (mbc_remain == NULL || tree == NULL, 0)) { *err = REG_ESPACE; return NULL; } } } #endif break; case OP_OPEN_SUBEXP: tree = parse_sub_exp (regexp, preg, token, syntax, nest + 1, err); if (BE (*err != REG_NOERROR && tree == NULL, 0)) return NULL; break; case OP_OPEN_BRACKET: tree = parse_bracket_exp (regexp, dfa, token, syntax, err); if (BE (*err != REG_NOERROR && tree == NULL, 0)) return NULL; break; case OP_BACK_REF: if (!BE (dfa->completed_bkref_map & (1 << token->opr.idx), 1)) { *err = REG_ESUBREG; return NULL; } dfa->used_bkref_map |= 1 << token->opr.idx; tree = create_token_tree (dfa, NULL, NULL, token); if (BE (tree == NULL, 0)) { *err = REG_ESPACE; return NULL; } ++dfa->nbackref; dfa->has_mb_node = 1; break; case OP_OPEN_DUP_NUM: if (syntax & RE_CONTEXT_INVALID_DUP) { *err = REG_BADRPT; return NULL; } /* FALLTHROUGH */ case OP_DUP_ASTERISK: case OP_DUP_PLUS: case OP_DUP_QUESTION: if (syntax & RE_CONTEXT_INVALID_OPS) { *err = REG_BADRPT; return NULL; } else if (syntax & RE_CONTEXT_INDEP_OPS) { fetch_token (token, regexp, syntax); return parse_expression (regexp, preg, token, syntax, nest, err); } /* else fall through */ case OP_CLOSE_SUBEXP: if ((token->type == OP_CLOSE_SUBEXP) && !(syntax & RE_UNMATCHED_RIGHT_PAREN_ORD)) { *err = REG_ERPAREN; return NULL; } /* else fall through */ case OP_CLOSE_DUP_NUM: /* We treat it as a normal character. */ /* Then we can these characters as normal characters. */ token->type = CHARACTER; /* mb_partial and word_char bits should be initialized already by peek_token. */ tree = create_token_tree (dfa, NULL, NULL, token); if (BE (tree == NULL, 0)) { *err = REG_ESPACE; return NULL; } break; case ANCHOR: if ((token->opr.ctx_type & (WORD_DELIM | NOT_WORD_DELIM | WORD_FIRST | WORD_LAST)) && dfa->word_ops_used == 0) init_word_char (dfa); if (token->opr.ctx_type == WORD_DELIM || token->opr.ctx_type == NOT_WORD_DELIM) { bin_tree_t *tree_first, *tree_last; if (token->opr.ctx_type == WORD_DELIM) { token->opr.ctx_type = WORD_FIRST; tree_first = create_token_tree (dfa, NULL, NULL, token); token->opr.ctx_type = WORD_LAST; } else { token->opr.ctx_type = INSIDE_WORD; tree_first = create_token_tree (dfa, NULL, NULL, token); token->opr.ctx_type = INSIDE_NOTWORD; } tree_last = create_token_tree (dfa, NULL, NULL, token); tree = create_tree (dfa, tree_first, tree_last, OP_ALT); if (BE (tree_first == NULL || tree_last == NULL || tree == NULL, 0)) { *err = REG_ESPACE; return NULL; } } else { tree = create_token_tree (dfa, NULL, NULL, token); if (BE (tree == NULL, 0)) { *err = REG_ESPACE; return NULL; } } /* We must return here, since ANCHORs can't be followed by repetition operators. eg. RE"^*" is invalid or "", it must not be "". */ fetch_token (token, regexp, syntax); return tree; case OP_PERIOD: tree = create_token_tree (dfa, NULL, NULL, token); if (BE (tree == NULL, 0)) { *err = REG_ESPACE; return NULL; } if (dfa->mb_cur_max > 1) dfa->has_mb_node = 1; break; case OP_WORD: case OP_NOTWORD: tree = build_charclass_op (dfa, regexp->trans, (const unsigned char *) "alnum", (const unsigned char *) "_", token->type == OP_NOTWORD, err); if (BE (*err != REG_NOERROR && tree == NULL, 0)) return NULL; break; case OP_SPACE: case OP_NOTSPACE: tree = build_charclass_op (dfa, regexp->trans, (const unsigned char *) "space", (const unsigned char *) "", token->type == OP_NOTSPACE, err); if (BE (*err != REG_NOERROR && tree == NULL, 0)) return NULL; break; case OP_ALT: case END_OF_RE: return NULL; case BACK_SLASH: *err = REG_EESCAPE; return NULL; default: /* Must not happen? */ #ifdef DEBUG assert (0); #endif return NULL; } fetch_token (token, regexp, syntax); while (token->type == OP_DUP_ASTERISK || token->type == OP_DUP_PLUS || token->type == OP_DUP_QUESTION || token->type == OP_OPEN_DUP_NUM) { tree = parse_dup_op (tree, regexp, dfa, token, syntax, err); if (BE (*err != REG_NOERROR && tree == NULL, 0)) return NULL; /* In BRE consecutive duplications are not allowed. */ if ((syntax & RE_CONTEXT_INVALID_DUP) && (token->type == OP_DUP_ASTERISK || token->type == OP_OPEN_DUP_NUM)) { *err = REG_BADRPT; return NULL; } } return tree; } /* This function build the following tree, from regular expression (): SUBEXP | */ static bin_tree_t * parse_sub_exp (re_string_t *regexp, regex_t *preg, re_token_t *token, reg_syntax_t syntax, int nest, reg_errcode_t *err) { re_dfa_t *dfa = (re_dfa_t *) preg->buffer; bin_tree_t *tree; size_t cur_nsub; cur_nsub = preg->re_nsub++; fetch_token (token, regexp, syntax | RE_CARET_ANCHORS_HERE); /* The subexpression may be a null string. */ if (token->type == OP_CLOSE_SUBEXP) tree = NULL; else { tree = parse_reg_exp (regexp, preg, token, syntax, nest, err); if (BE (*err == REG_NOERROR && token->type != OP_CLOSE_SUBEXP, 0)) { if (tree != NULL) postorder (tree, free_tree, NULL); *err = REG_EPAREN; } if (BE (*err != REG_NOERROR, 0)) return NULL; } if (cur_nsub <= '9' - '1') dfa->completed_bkref_map |= 1 << cur_nsub; tree = create_tree (dfa, tree, NULL, SUBEXP); if (BE (tree == NULL, 0)) { *err = REG_ESPACE; return NULL; } tree->token.opr.idx = cur_nsub; return tree; } /* This function parse repetition operators like "*", "+", "{1,3}" etc. */ static bin_tree_t * parse_dup_op (bin_tree_t *elem, re_string_t *regexp, re_dfa_t *dfa, re_token_t *token, reg_syntax_t syntax, reg_errcode_t *err) { bin_tree_t *tree = NULL, *old_tree = NULL; int i, start, end, start_idx = re_string_cur_idx (regexp); re_token_t start_token = *token; if (token->type == OP_OPEN_DUP_NUM) { end = 0; start = fetch_number (regexp, token, syntax); if (start == -1) { if (token->type == CHARACTER && token->opr.c == ',') start = 0; /* We treat "{,m}" as "{0,m}". */ else { *err = REG_BADBR; /* {} is invalid. */ return NULL; } } if (BE (start != -2, 1)) { /* We treat "{n}" as "{n,n}". */ end = ((token->type == OP_CLOSE_DUP_NUM) ? start : ((token->type == CHARACTER && token->opr.c == ',') ? fetch_number (regexp, token, syntax) : -2)); } if (BE (start == -2 || end == -2, 0)) { /* Invalid sequence. */ if (BE (!(syntax & RE_INVALID_INTERVAL_ORD), 0)) { if (token->type == END_OF_RE) *err = REG_EBRACE; else *err = REG_BADBR; return NULL; } /* If the syntax bit is set, rollback. */ re_string_set_index (regexp, start_idx); *token = start_token; token->type = CHARACTER; /* mb_partial and word_char bits should be already initialized by peek_token. */ return elem; } if (BE ((end != -1 && start > end) || token->type != OP_CLOSE_DUP_NUM, 0)) { /* First number greater than second. */ *err = REG_BADBR; return NULL; } } else { start = (token->type == OP_DUP_PLUS) ? 1 : 0; end = (token->type == OP_DUP_QUESTION) ? 1 : -1; } fetch_token (token, regexp, syntax); if (BE (elem == NULL, 0)) return NULL; if (BE (start == 0 && end == 0, 0)) { postorder (elem, free_tree, NULL); return NULL; } /* Extract "{n,m}" to "...{0,}". */ if (BE (start > 0, 0)) { tree = elem; for (i = 2; i <= start; ++i) { elem = duplicate_tree (elem, dfa); tree = create_tree (dfa, tree, elem, CONCAT); if (BE (elem == NULL || tree == NULL, 0)) goto parse_dup_op_espace; } if (start == end) return tree; /* Duplicate ELEM before it is marked optional. */ elem = duplicate_tree (elem, dfa); old_tree = tree; } else old_tree = NULL; if (elem->token.type == SUBEXP) postorder (elem, mark_opt_subexp, (void *) (long) elem->token.opr.idx); tree = create_tree (dfa, elem, NULL, (end == -1 ? OP_DUP_ASTERISK : OP_ALT)); if (BE (tree == NULL, 0)) goto parse_dup_op_espace; /* This loop is actually executed only when end != -1, to rewrite {0,n} as ((...?)?)?... We have already created the start+1-th copy. */ for (i = start + 2; i <= end; ++i) { elem = duplicate_tree (elem, dfa); tree = create_tree (dfa, tree, elem, CONCAT); if (BE (elem == NULL || tree == NULL, 0)) goto parse_dup_op_espace; tree = create_tree (dfa, tree, NULL, OP_ALT); if (BE (tree == NULL, 0)) goto parse_dup_op_espace; } if (old_tree) tree = create_tree (dfa, old_tree, tree, CONCAT); return tree; parse_dup_op_espace: *err = REG_ESPACE; return NULL; } /* Size of the names for collating symbol/equivalence_class/character_class. I'm not sure, but maybe enough. */ #define BRACKET_NAME_BUF_SIZE 32 #ifndef _LIBC /* Local function for parse_bracket_exp only used in case of NOT _LIBC. Build the range expression which starts from START_ELEM, and ends at END_ELEM. The result are written to MBCSET and SBCSET. RANGE_ALLOC is the allocated size of mbcset->range_starts, and mbcset->range_ends, is a pointer argument sinse we may update it. */ static reg_errcode_t internal_function # ifdef RE_ENABLE_I18N build_range_exp (bitset_t sbcset, re_charset_t *mbcset, int *range_alloc, bracket_elem_t *start_elem, bracket_elem_t *end_elem) # else /* not RE_ENABLE_I18N */ build_range_exp (bitset_t sbcset, bracket_elem_t *start_elem, bracket_elem_t *end_elem) # endif /* not RE_ENABLE_I18N */ { unsigned int start_ch, end_ch; /* Equivalence Classes and Character Classes can't be a range start/end. */ if (BE (start_elem->type == EQUIV_CLASS || start_elem->type == CHAR_CLASS || end_elem->type == EQUIV_CLASS || end_elem->type == CHAR_CLASS, 0)) return REG_ERANGE; /* We can handle no multi character collating elements without libc support. */ if (BE ((start_elem->type == COLL_SYM && strlen ((char *) start_elem->opr.name) > 1) || (end_elem->type == COLL_SYM && strlen ((char *) end_elem->opr.name) > 1), 0)) return REG_ECOLLATE; # ifdef RE_ENABLE_I18N { wchar_t wc; wint_t start_wc; wint_t end_wc; wchar_t cmp_buf[6] = {L'\0', L'\0', L'\0', L'\0', L'\0', L'\0'}; start_ch = ((start_elem->type == SB_CHAR) ? start_elem->opr.ch : ((start_elem->type == COLL_SYM) ? start_elem->opr.name[0] : 0)); end_ch = ((end_elem->type == SB_CHAR) ? end_elem->opr.ch : ((end_elem->type == COLL_SYM) ? end_elem->opr.name[0] : 0)); start_wc = ((start_elem->type == SB_CHAR || start_elem->type == COLL_SYM) ? __btowc (start_ch) : start_elem->opr.wch); end_wc = ((end_elem->type == SB_CHAR || end_elem->type == COLL_SYM) ? __btowc (end_ch) : end_elem->opr.wch); if (start_wc == WEOF || end_wc == WEOF) return REG_ECOLLATE; cmp_buf[0] = start_wc; cmp_buf[4] = end_wc; -#ifdef __FreeBSD__ - if (wcscmp (cmp_buf, cmp_buf + 4) > 0) -#else if (wcscoll (cmp_buf, cmp_buf + 4) > 0) -#endif return REG_ERANGE; /* Got valid collation sequence values, add them as a new entry. However, for !_LIBC we have no collation elements: if the character set is single byte, the single byte character set that we build below suffices. parse_bracket_exp passes no MBCSET if dfa->mb_cur_max == 1. */ if (mbcset) { /* Check the space of the arrays. */ if (BE (*range_alloc == mbcset->nranges, 0)) { /* There is not enough space, need realloc. */ wchar_t *new_array_start, *new_array_end; int new_nranges; /* +1 in case of mbcset->nranges is 0. */ new_nranges = 2 * mbcset->nranges + 1; /* Use realloc since mbcset->range_starts and mbcset->range_ends are NULL if *range_alloc == 0. */ new_array_start = re_realloc (mbcset->range_starts, wchar_t, new_nranges); new_array_end = re_realloc (mbcset->range_ends, wchar_t, new_nranges); if (BE (new_array_start == NULL || new_array_end == NULL, 0)) return REG_ESPACE; mbcset->range_starts = new_array_start; mbcset->range_ends = new_array_end; *range_alloc = new_nranges; } mbcset->range_starts[mbcset->nranges] = start_wc; mbcset->range_ends[mbcset->nranges++] = end_wc; } /* Build the table for single byte characters. */ for (wc = 0; wc < SBC_MAX; ++wc) { cmp_buf[2] = wc; -#ifdef __FreeBSD__ - if (wcscmp (cmp_buf, cmp_buf + 2) <= 0 - && wcscmp (cmp_buf + 2, cmp_buf + 4) <= 0) -#else if (wcscoll (cmp_buf, cmp_buf + 2) <= 0 && wcscoll (cmp_buf + 2, cmp_buf + 4) <= 0) -#endif bitset_set (sbcset, wc); } } # else /* not RE_ENABLE_I18N */ { unsigned int ch; start_ch = ((start_elem->type == SB_CHAR ) ? start_elem->opr.ch : ((start_elem->type == COLL_SYM) ? start_elem->opr.name[0] : 0)); end_ch = ((end_elem->type == SB_CHAR ) ? end_elem->opr.ch : ((end_elem->type == COLL_SYM) ? end_elem->opr.name[0] : 0)); if (start_ch > end_ch) return REG_ERANGE; /* Build the table for single byte characters. */ for (ch = 0; ch < SBC_MAX; ++ch) if (start_ch <= ch && ch <= end_ch) bitset_set (sbcset, ch); } # endif /* not RE_ENABLE_I18N */ return REG_NOERROR; } #endif /* not _LIBC */ #ifndef _LIBC /* Helper function for parse_bracket_exp only used in case of NOT _LIBC.. Build the collating element which is represented by NAME. The result are written to MBCSET and SBCSET. COLL_SYM_ALLOC is the allocated size of mbcset->coll_sym, is a pointer argument since we may update it. */ static reg_errcode_t internal_function # ifdef RE_ENABLE_I18N build_collating_symbol (bitset_t sbcset, re_charset_t *mbcset, int *coll_sym_alloc, const unsigned char *name) # else /* not RE_ENABLE_I18N */ build_collating_symbol (bitset_t sbcset, const unsigned char *name) # endif /* not RE_ENABLE_I18N */ { size_t name_len = strlen ((const char *) name); if (BE (name_len != 1, 0)) return REG_ECOLLATE; else { bitset_set (sbcset, name[0]); return REG_NOERROR; } } #endif /* not _LIBC */ /* This function parse bracket expression like "[abc]", "[a-c]", "[[.a-a.]]" etc. */ static bin_tree_t * parse_bracket_exp (re_string_t *regexp, re_dfa_t *dfa, re_token_t *token, reg_syntax_t syntax, reg_errcode_t *err) { #ifdef _LIBC const unsigned char *collseqmb; const char *collseqwc; uint32_t nrules; int32_t table_size; const int32_t *symb_table; const unsigned char *extra; /* Local function for parse_bracket_exp used in _LIBC environement. Seek the collating symbol entry correspondings to NAME. Return the index of the symbol in the SYMB_TABLE, or -1 if not found. */ auto inline int32_t __attribute ((always_inline)) seek_collating_symbol_entry (const unsigned char *name, size_t name_len) { int32_t elem; for (elem = 0; elem < table_size; elem++) if (symb_table[2 * elem] != 0) { int32_t idx = symb_table[2 * elem + 1]; /* Skip the name of collating element name. */ idx += 1 + extra[idx]; if (/* Compare the length of the name. */ name_len == extra[idx] /* Compare the name. */ && memcmp (name, &extra[idx + 1], name_len) == 0) /* Yep, this is the entry. */ return elem; } return -1; } /* Local function for parse_bracket_exp used in _LIBC environment. Look up the collation sequence value of BR_ELEM. Return the value if succeeded, UINT_MAX otherwise. */ auto inline unsigned int __attribute ((always_inline)) lookup_collation_sequence_value (bracket_elem_t *br_elem) { if (br_elem->type == SB_CHAR) { /* if (MB_CUR_MAX == 1) */ if (nrules == 0) return collseqmb[br_elem->opr.ch]; else { wint_t wc = __btowc (br_elem->opr.ch); return __collseq_table_lookup (collseqwc, wc); } } else if (br_elem->type == MB_CHAR) { if (nrules != 0) return __collseq_table_lookup (collseqwc, br_elem->opr.wch); } else if (br_elem->type == COLL_SYM) { size_t sym_name_len = strlen ((char *) br_elem->opr.name); if (nrules != 0) { int32_t elem, idx; elem = seek_collating_symbol_entry (br_elem->opr.name, sym_name_len); if (elem != -1) { /* We found the entry. */ idx = symb_table[2 * elem + 1]; /* Skip the name of collating element name. */ idx += 1 + extra[idx]; /* Skip the byte sequence of the collating element. */ idx += 1 + extra[idx]; /* Adjust for the alignment. */ idx = (idx + 3) & ~3; /* Skip the multibyte collation sequence value. */ idx += sizeof (unsigned int); /* Skip the wide char sequence of the collating element. */ idx += sizeof (unsigned int) * (1 + *(unsigned int *) (extra + idx)); /* Return the collation sequence value. */ return *(unsigned int *) (extra + idx); } else if (sym_name_len == 1) { /* No valid character. Match it as a single byte character. */ return collseqmb[br_elem->opr.name[0]]; } } else if (sym_name_len == 1) return collseqmb[br_elem->opr.name[0]]; } return UINT_MAX; } /* Local function for parse_bracket_exp used in _LIBC environement. Build the range expression which starts from START_ELEM, and ends at END_ELEM. The result are written to MBCSET and SBCSET. RANGE_ALLOC is the allocated size of mbcset->range_starts, and mbcset->range_ends, is a pointer argument sinse we may update it. */ auto inline reg_errcode_t __attribute ((always_inline)) build_range_exp (bitset_t sbcset, re_charset_t *mbcset, int *range_alloc, bracket_elem_t *start_elem, bracket_elem_t *end_elem) { unsigned int ch; uint32_t start_collseq; uint32_t end_collseq; /* Equivalence Classes and Character Classes can't be a range start/end. */ if (BE (start_elem->type == EQUIV_CLASS || start_elem->type == CHAR_CLASS || end_elem->type == EQUIV_CLASS || end_elem->type == CHAR_CLASS, 0)) return REG_ERANGE; start_collseq = lookup_collation_sequence_value (start_elem); end_collseq = lookup_collation_sequence_value (end_elem); /* Check start/end collation sequence values. */ if (BE (start_collseq == UINT_MAX || end_collseq == UINT_MAX, 0)) return REG_ECOLLATE; if (BE ((syntax & RE_NO_EMPTY_RANGES) && start_collseq > end_collseq, 0)) return REG_ERANGE; /* Got valid collation sequence values, add them as a new entry. However, if we have no collation elements, and the character set is single byte, the single byte character set that we build below suffices. */ if (nrules > 0 || dfa->mb_cur_max > 1) { /* Check the space of the arrays. */ if (BE (*range_alloc == mbcset->nranges, 0)) { /* There is not enough space, need realloc. */ uint32_t *new_array_start; uint32_t *new_array_end; int new_nranges; /* +1 in case of mbcset->nranges is 0. */ new_nranges = 2 * mbcset->nranges + 1; new_array_start = re_realloc (mbcset->range_starts, uint32_t, new_nranges); new_array_end = re_realloc (mbcset->range_ends, uint32_t, new_nranges); if (BE (new_array_start == NULL || new_array_end == NULL, 0)) return REG_ESPACE; mbcset->range_starts = new_array_start; mbcset->range_ends = new_array_end; *range_alloc = new_nranges; } mbcset->range_starts[mbcset->nranges] = start_collseq; mbcset->range_ends[mbcset->nranges++] = end_collseq; } /* Build the table for single byte characters. */ for (ch = 0; ch < SBC_MAX; ch++) { uint32_t ch_collseq; /* if (MB_CUR_MAX == 1) */ if (nrules == 0) ch_collseq = collseqmb[ch]; else ch_collseq = __collseq_table_lookup (collseqwc, __btowc (ch)); if (start_collseq <= ch_collseq && ch_collseq <= end_collseq) bitset_set (sbcset, ch); } return REG_NOERROR; } /* Local function for parse_bracket_exp used in _LIBC environement. Build the collating element which is represented by NAME. The result are written to MBCSET and SBCSET. COLL_SYM_ALLOC is the allocated size of mbcset->coll_sym, is a pointer argument sinse we may update it. */ auto inline reg_errcode_t __attribute ((always_inline)) build_collating_symbol (bitset_t sbcset, re_charset_t *mbcset, int *coll_sym_alloc, const unsigned char *name) { int32_t elem, idx; size_t name_len = strlen ((const char *) name); if (nrules != 0) { elem = seek_collating_symbol_entry (name, name_len); if (elem != -1) { /* We found the entry. */ idx = symb_table[2 * elem + 1]; /* Skip the name of collating element name. */ idx += 1 + extra[idx]; } else if (name_len == 1) { /* No valid character, treat it as a normal character. */ bitset_set (sbcset, name[0]); return REG_NOERROR; } else return REG_ECOLLATE; /* Got valid collation sequence, add it as a new entry. */ /* Check the space of the arrays. */ if (BE (*coll_sym_alloc == mbcset->ncoll_syms, 0)) { /* Not enough, realloc it. */ /* +1 in case of mbcset->ncoll_syms is 0. */ int new_coll_sym_alloc = 2 * mbcset->ncoll_syms + 1; /* Use realloc since mbcset->coll_syms is NULL if *alloc == 0. */ int32_t *new_coll_syms = re_realloc (mbcset->coll_syms, int32_t, new_coll_sym_alloc); if (BE (new_coll_syms == NULL, 0)) return REG_ESPACE; mbcset->coll_syms = new_coll_syms; *coll_sym_alloc = new_coll_sym_alloc; } mbcset->coll_syms[mbcset->ncoll_syms++] = idx; return REG_NOERROR; } else { if (BE (name_len != 1, 0)) return REG_ECOLLATE; else { bitset_set (sbcset, name[0]); return REG_NOERROR; } } } #endif re_token_t br_token; re_bitset_ptr_t sbcset; #ifdef RE_ENABLE_I18N re_charset_t *mbcset; int coll_sym_alloc = 0, range_alloc = 0, mbchar_alloc = 0; int equiv_class_alloc = 0, char_class_alloc = 0; #endif /* not RE_ENABLE_I18N */ int non_match = 0; bin_tree_t *work_tree; int token_len; int first_round = 1; #ifdef _LIBC collseqmb = (const unsigned char *) _NL_CURRENT (LC_COLLATE, _NL_COLLATE_COLLSEQMB); nrules = _NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES); if (nrules) { /* if (MB_CUR_MAX > 1) */ collseqwc = _NL_CURRENT (LC_COLLATE, _NL_COLLATE_COLLSEQWC); table_size = _NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_SYMB_HASH_SIZEMB); symb_table = (const int32_t *) _NL_CURRENT (LC_COLLATE, _NL_COLLATE_SYMB_TABLEMB); extra = (const unsigned char *) _NL_CURRENT (LC_COLLATE, _NL_COLLATE_SYMB_EXTRAMB); } #endif sbcset = (re_bitset_ptr_t) calloc (sizeof (bitset_t), 1); #ifdef RE_ENABLE_I18N mbcset = (re_charset_t *) calloc (sizeof (re_charset_t), 1); #endif /* RE_ENABLE_I18N */ #ifdef RE_ENABLE_I18N if (BE (sbcset == NULL || mbcset == NULL, 0)) #else if (BE (sbcset == NULL, 0)) #endif /* RE_ENABLE_I18N */ { re_free (sbcset); #ifdef RE_ENABLE_I18N re_free (mbcset); #endif *err = REG_ESPACE; return NULL; } token_len = peek_token_bracket (token, regexp, syntax); if (BE (token->type == END_OF_RE, 0)) { *err = REG_BADPAT; goto parse_bracket_exp_free_return; } if (token->type == OP_NON_MATCH_LIST) { #ifdef RE_ENABLE_I18N mbcset->non_match = 1; #endif /* not RE_ENABLE_I18N */ non_match = 1; if (syntax & RE_HAT_LISTS_NOT_NEWLINE) bitset_set (sbcset, '\n'); re_string_skip_bytes (regexp, token_len); /* Skip a token. */ token_len = peek_token_bracket (token, regexp, syntax); if (BE (token->type == END_OF_RE, 0)) { *err = REG_BADPAT; goto parse_bracket_exp_free_return; } } /* We treat the first ']' as a normal character. */ if (token->type == OP_CLOSE_BRACKET) token->type = CHARACTER; while (1) { bracket_elem_t start_elem, end_elem; unsigned char start_name_buf[BRACKET_NAME_BUF_SIZE]; unsigned char end_name_buf[BRACKET_NAME_BUF_SIZE]; reg_errcode_t ret; int token_len2 = 0, is_range_exp = 0; re_token_t token2; start_elem.opr.name = start_name_buf; ret = parse_bracket_element (&start_elem, regexp, token, token_len, dfa, syntax, first_round); if (BE (ret != REG_NOERROR, 0)) { *err = ret; goto parse_bracket_exp_free_return; } first_round = 0; /* Get information about the next token. We need it in any case. */ token_len = peek_token_bracket (token, regexp, syntax); /* Do not check for ranges if we know they are not allowed. */ if (start_elem.type != CHAR_CLASS && start_elem.type != EQUIV_CLASS) { if (BE (token->type == END_OF_RE, 0)) { *err = REG_EBRACK; goto parse_bracket_exp_free_return; } if (token->type == OP_CHARSET_RANGE) { re_string_skip_bytes (regexp, token_len); /* Skip '-'. */ token_len2 = peek_token_bracket (&token2, regexp, syntax); if (BE (token2.type == END_OF_RE, 0)) { *err = REG_EBRACK; goto parse_bracket_exp_free_return; } if (token2.type == OP_CLOSE_BRACKET) { /* We treat the last '-' as a normal character. */ re_string_skip_bytes (regexp, -token_len); token->type = CHARACTER; } else is_range_exp = 1; } } if (is_range_exp == 1) { end_elem.opr.name = end_name_buf; ret = parse_bracket_element (&end_elem, regexp, &token2, token_len2, dfa, syntax, 1); if (BE (ret != REG_NOERROR, 0)) { *err = ret; goto parse_bracket_exp_free_return; } token_len = peek_token_bracket (token, regexp, syntax); #ifdef _LIBC *err = build_range_exp (sbcset, mbcset, &range_alloc, &start_elem, &end_elem); #else # ifdef RE_ENABLE_I18N *err = build_range_exp (sbcset, dfa->mb_cur_max > 1 ? mbcset : NULL, &range_alloc, &start_elem, &end_elem); # else *err = build_range_exp (sbcset, &start_elem, &end_elem); # endif #endif /* RE_ENABLE_I18N */ if (BE (*err != REG_NOERROR, 0)) goto parse_bracket_exp_free_return; } else { switch (start_elem.type) { case SB_CHAR: bitset_set (sbcset, start_elem.opr.ch); break; #ifdef RE_ENABLE_I18N case MB_CHAR: /* Check whether the array has enough space. */ if (BE (mbchar_alloc == mbcset->nmbchars, 0)) { wchar_t *new_mbchars; /* Not enough, realloc it. */ /* +1 in case of mbcset->nmbchars is 0. */ mbchar_alloc = 2 * mbcset->nmbchars + 1; /* Use realloc since array is NULL if *alloc == 0. */ new_mbchars = re_realloc (mbcset->mbchars, wchar_t, mbchar_alloc); if (BE (new_mbchars == NULL, 0)) goto parse_bracket_exp_espace; mbcset->mbchars = new_mbchars; } mbcset->mbchars[mbcset->nmbchars++] = start_elem.opr.wch; break; #endif /* RE_ENABLE_I18N */ case EQUIV_CLASS: *err = build_equiv_class (sbcset, #ifdef RE_ENABLE_I18N mbcset, &equiv_class_alloc, #endif /* RE_ENABLE_I18N */ start_elem.opr.name); if (BE (*err != REG_NOERROR, 0)) goto parse_bracket_exp_free_return; break; case COLL_SYM: *err = build_collating_symbol (sbcset, #ifdef RE_ENABLE_I18N mbcset, &coll_sym_alloc, #endif /* RE_ENABLE_I18N */ start_elem.opr.name); if (BE (*err != REG_NOERROR, 0)) goto parse_bracket_exp_free_return; break; case CHAR_CLASS: *err = build_charclass (regexp->trans, sbcset, #ifdef RE_ENABLE_I18N mbcset, &char_class_alloc, #endif /* RE_ENABLE_I18N */ start_elem.opr.name, syntax); if (BE (*err != REG_NOERROR, 0)) goto parse_bracket_exp_free_return; break; default: assert (0); break; } } if (BE (token->type == END_OF_RE, 0)) { *err = REG_EBRACK; goto parse_bracket_exp_free_return; } if (token->type == OP_CLOSE_BRACKET) break; } re_string_skip_bytes (regexp, token_len); /* Skip a token. */ /* If it is non-matching list. */ if (non_match) bitset_not (sbcset); #ifdef RE_ENABLE_I18N /* Ensure only single byte characters are set. */ if (dfa->mb_cur_max > 1) bitset_mask (sbcset, dfa->sb_char); if (mbcset->nmbchars || mbcset->ncoll_syms || mbcset->nequiv_classes || mbcset->nranges || (dfa->mb_cur_max > 1 && (mbcset->nchar_classes || mbcset->non_match))) { bin_tree_t *mbc_tree; int sbc_idx; /* Build a tree for complex bracket. */ dfa->has_mb_node = 1; br_token.type = COMPLEX_BRACKET; br_token.opr.mbcset = mbcset; mbc_tree = create_token_tree (dfa, NULL, NULL, &br_token); if (BE (mbc_tree == NULL, 0)) goto parse_bracket_exp_espace; for (sbc_idx = 0; sbc_idx < BITSET_WORDS; ++sbc_idx) if (sbcset[sbc_idx]) break; /* If there are no bits set in sbcset, there is no point of having both SIMPLE_BRACKET and COMPLEX_BRACKET. */ if (sbc_idx < BITSET_WORDS) { /* Build a tree for simple bracket. */ br_token.type = SIMPLE_BRACKET; br_token.opr.sbcset = sbcset; work_tree = create_token_tree (dfa, NULL, NULL, &br_token); if (BE (work_tree == NULL, 0)) goto parse_bracket_exp_espace; /* Then join them by ALT node. */ work_tree = create_tree (dfa, work_tree, mbc_tree, OP_ALT); if (BE (work_tree == NULL, 0)) goto parse_bracket_exp_espace; } else { re_free (sbcset); work_tree = mbc_tree; } } else #endif /* not RE_ENABLE_I18N */ { #ifdef RE_ENABLE_I18N free_charset (mbcset); #endif /* Build a tree for simple bracket. */ br_token.type = SIMPLE_BRACKET; br_token.opr.sbcset = sbcset; work_tree = create_token_tree (dfa, NULL, NULL, &br_token); if (BE (work_tree == NULL, 0)) goto parse_bracket_exp_espace; } return work_tree; parse_bracket_exp_espace: *err = REG_ESPACE; parse_bracket_exp_free_return: re_free (sbcset); #ifdef RE_ENABLE_I18N free_charset (mbcset); #endif /* RE_ENABLE_I18N */ return NULL; } /* Parse an element in the bracket expression. */ static reg_errcode_t parse_bracket_element (bracket_elem_t *elem, re_string_t *regexp, re_token_t *token, int token_len, re_dfa_t *dfa, reg_syntax_t syntax, int accept_hyphen) { #ifdef RE_ENABLE_I18N int cur_char_size; cur_char_size = re_string_char_size_at (regexp, re_string_cur_idx (regexp)); if (cur_char_size > 1) { elem->type = MB_CHAR; elem->opr.wch = re_string_wchar_at (regexp, re_string_cur_idx (regexp)); re_string_skip_bytes (regexp, cur_char_size); return REG_NOERROR; } #endif /* RE_ENABLE_I18N */ re_string_skip_bytes (regexp, token_len); /* Skip a token. */ if (token->type == OP_OPEN_COLL_ELEM || token->type == OP_OPEN_CHAR_CLASS || token->type == OP_OPEN_EQUIV_CLASS) return parse_bracket_symbol (elem, regexp, token); if (BE (token->type == OP_CHARSET_RANGE, 0) && !accept_hyphen) { /* A '-' must only appear as anything but a range indicator before the closing bracket. Everything else is an error. */ re_token_t token2; (void) peek_token_bracket (&token2, regexp, syntax); if (token2.type != OP_CLOSE_BRACKET) /* The actual error value is not standardized since this whole case is undefined. But ERANGE makes good sense. */ return REG_ERANGE; } elem->type = SB_CHAR; elem->opr.ch = token->opr.c; return REG_NOERROR; } /* Parse a bracket symbol in the bracket expression. Bracket symbols are such as [::], [..], and [==]. */ static reg_errcode_t parse_bracket_symbol (bracket_elem_t *elem, re_string_t *regexp, re_token_t *token) { unsigned char ch, delim = token->opr.c; int i = 0; if (re_string_eoi(regexp)) return REG_EBRACK; for (;; ++i) { if (i >= BRACKET_NAME_BUF_SIZE) return REG_EBRACK; if (token->type == OP_OPEN_CHAR_CLASS) ch = re_string_fetch_byte_case (regexp); else ch = re_string_fetch_byte (regexp); if (re_string_eoi(regexp)) return REG_EBRACK; if (ch == delim && re_string_peek_byte (regexp, 0) == ']') break; elem->opr.name[i] = ch; } re_string_skip_bytes (regexp, 1); elem->opr.name[i] = '\0'; switch (token->type) { case OP_OPEN_COLL_ELEM: elem->type = COLL_SYM; break; case OP_OPEN_EQUIV_CLASS: elem->type = EQUIV_CLASS; break; case OP_OPEN_CHAR_CLASS: elem->type = CHAR_CLASS; break; default: break; } return REG_NOERROR; } /* Helper function for parse_bracket_exp. Build the equivalence class which is represented by NAME. The result are written to MBCSET and SBCSET. EQUIV_CLASS_ALLOC is the allocated size of mbcset->equiv_classes, is a pointer argument sinse we may update it. */ static reg_errcode_t #ifdef RE_ENABLE_I18N build_equiv_class (bitset_t sbcset, re_charset_t *mbcset, int *equiv_class_alloc, const unsigned char *name) #else /* not RE_ENABLE_I18N */ build_equiv_class (bitset_t sbcset, const unsigned char *name) #endif /* not RE_ENABLE_I18N */ { #ifdef _LIBC uint32_t nrules = _NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES); if (nrules != 0) { const int32_t *table, *indirect; const unsigned char *weights, *extra, *cp; unsigned char char_buf[2]; int32_t idx1, idx2; unsigned int ch; size_t len; /* This #include defines a local function! */ # include /* Calculate the index for equivalence class. */ cp = name; table = (const int32_t *) _NL_CURRENT (LC_COLLATE, _NL_COLLATE_TABLEMB); weights = (const unsigned char *) _NL_CURRENT (LC_COLLATE, _NL_COLLATE_WEIGHTMB); extra = (const unsigned char *) _NL_CURRENT (LC_COLLATE, _NL_COLLATE_EXTRAMB); indirect = (const int32_t *) _NL_CURRENT (LC_COLLATE, _NL_COLLATE_INDIRECTMB); idx1 = findidx (&cp, -1); if (BE (idx1 == 0 || *cp != '\0', 0)) /* This isn't a valid character. */ return REG_ECOLLATE; /* Build single byte matcing table for this equivalence class. */ len = weights[idx1 & 0xffffff]; for (ch = 0; ch < SBC_MAX; ++ch) { char_buf[0] = ch; cp = char_buf; idx2 = findidx (&cp, 1); /* idx2 = table[ch]; */ if (idx2 == 0) /* This isn't a valid character. */ continue; /* Compare only if the length matches and the collation rule index is the same. */ if (len == weights[idx2 & 0xffffff] && (idx1 >> 24) == (idx2 >> 24)) { int cnt = 0; while (cnt <= len && weights[(idx1 & 0xffffff) + 1 + cnt] == weights[(idx2 & 0xffffff) + 1 + cnt]) ++cnt; if (cnt > len) bitset_set (sbcset, ch); } } /* Check whether the array has enough space. */ if (BE (*equiv_class_alloc == mbcset->nequiv_classes, 0)) { /* Not enough, realloc it. */ /* +1 in case of mbcset->nequiv_classes is 0. */ int new_equiv_class_alloc = 2 * mbcset->nequiv_classes + 1; /* Use realloc since the array is NULL if *alloc == 0. */ int32_t *new_equiv_classes = re_realloc (mbcset->equiv_classes, int32_t, new_equiv_class_alloc); if (BE (new_equiv_classes == NULL, 0)) return REG_ESPACE; mbcset->equiv_classes = new_equiv_classes; *equiv_class_alloc = new_equiv_class_alloc; } mbcset->equiv_classes[mbcset->nequiv_classes++] = idx1; } else #endif /* _LIBC */ { if (BE (strlen ((const char *) name) != 1, 0)) return REG_ECOLLATE; bitset_set (sbcset, *name); } return REG_NOERROR; } /* Helper function for parse_bracket_exp. Build the character class which is represented by NAME. The result are written to MBCSET and SBCSET. CHAR_CLASS_ALLOC is the allocated size of mbcset->char_classes, is a pointer argument sinse we may update it. */ static reg_errcode_t #ifdef RE_ENABLE_I18N build_charclass (RE_TRANSLATE_TYPE trans, bitset_t sbcset, re_charset_t *mbcset, int *char_class_alloc, const unsigned char *class_name, reg_syntax_t syntax) #else /* not RE_ENABLE_I18N */ build_charclass (RE_TRANSLATE_TYPE trans, bitset_t sbcset, const unsigned char *class_name, reg_syntax_t syntax) #endif /* not RE_ENABLE_I18N */ { int i; const char *name = (const char *) class_name; /* In case of REG_ICASE "upper" and "lower" match the both of upper and lower cases. */ if ((syntax & RE_ICASE) && (strcmp (name, "upper") == 0 || strcmp (name, "lower") == 0)) name = "alpha"; #ifdef RE_ENABLE_I18N /* Check the space of the arrays. */ if (BE (*char_class_alloc == mbcset->nchar_classes, 0)) { /* Not enough, realloc it. */ /* +1 in case of mbcset->nchar_classes is 0. */ int new_char_class_alloc = 2 * mbcset->nchar_classes + 1; /* Use realloc since array is NULL if *alloc == 0. */ wctype_t *new_char_classes = re_realloc (mbcset->char_classes, wctype_t, new_char_class_alloc); if (BE (new_char_classes == NULL, 0)) return REG_ESPACE; mbcset->char_classes = new_char_classes; *char_class_alloc = new_char_class_alloc; } mbcset->char_classes[mbcset->nchar_classes++] = __wctype (name); #endif /* RE_ENABLE_I18N */ #define BUILD_CHARCLASS_LOOP(ctype_func) \ do { \ if (BE (trans != NULL, 0)) \ { \ for (i = 0; i < SBC_MAX; ++i) \ if (ctype_func (i)) \ bitset_set (sbcset, trans[i]); \ } \ else \ { \ for (i = 0; i < SBC_MAX; ++i) \ if (ctype_func (i)) \ bitset_set (sbcset, i); \ } \ } while (0) if (strcmp (name, "alnum") == 0) BUILD_CHARCLASS_LOOP (isalnum); else if (strcmp (name, "cntrl") == 0) BUILD_CHARCLASS_LOOP (iscntrl); else if (strcmp (name, "lower") == 0) BUILD_CHARCLASS_LOOP (islower); else if (strcmp (name, "space") == 0) BUILD_CHARCLASS_LOOP (isspace); else if (strcmp (name, "alpha") == 0) BUILD_CHARCLASS_LOOP (isalpha); else if (strcmp (name, "digit") == 0) BUILD_CHARCLASS_LOOP (isdigit); else if (strcmp (name, "print") == 0) BUILD_CHARCLASS_LOOP (isprint); else if (strcmp (name, "upper") == 0) BUILD_CHARCLASS_LOOP (isupper); else if (strcmp (name, "blank") == 0) BUILD_CHARCLASS_LOOP (isblank); else if (strcmp (name, "graph") == 0) BUILD_CHARCLASS_LOOP (isgraph); else if (strcmp (name, "punct") == 0) BUILD_CHARCLASS_LOOP (ispunct); else if (strcmp (name, "xdigit") == 0) BUILD_CHARCLASS_LOOP (isxdigit); else return REG_ECTYPE; return REG_NOERROR; } static bin_tree_t * build_charclass_op (re_dfa_t *dfa, RE_TRANSLATE_TYPE trans, const unsigned char *class_name, const unsigned char *extra, int non_match, reg_errcode_t *err) { re_bitset_ptr_t sbcset; #ifdef RE_ENABLE_I18N re_charset_t *mbcset; int alloc = 0; #endif /* not RE_ENABLE_I18N */ reg_errcode_t ret; re_token_t br_token; bin_tree_t *tree; sbcset = (re_bitset_ptr_t) calloc (sizeof (bitset_t), 1); #ifdef RE_ENABLE_I18N mbcset = (re_charset_t *) calloc (sizeof (re_charset_t), 1); #endif /* RE_ENABLE_I18N */ #ifdef RE_ENABLE_I18N if (BE (sbcset == NULL || mbcset == NULL, 0)) #else /* not RE_ENABLE_I18N */ if (BE (sbcset == NULL, 0)) #endif /* not RE_ENABLE_I18N */ { *err = REG_ESPACE; return NULL; } if (non_match) { #ifdef RE_ENABLE_I18N mbcset->non_match = 1; #endif /* not RE_ENABLE_I18N */ } /* We don't care the syntax in this case. */ ret = build_charclass (trans, sbcset, #ifdef RE_ENABLE_I18N mbcset, &alloc, #endif /* RE_ENABLE_I18N */ class_name, 0); if (BE (ret != REG_NOERROR, 0)) { re_free (sbcset); #ifdef RE_ENABLE_I18N free_charset (mbcset); #endif /* RE_ENABLE_I18N */ *err = ret; return NULL; } /* \w match '_' also. */ for (; *extra; extra++) bitset_set (sbcset, *extra); /* If it is non-matching list. */ if (non_match) bitset_not (sbcset); #ifdef RE_ENABLE_I18N /* Ensure only single byte characters are set. */ if (dfa->mb_cur_max > 1) bitset_mask (sbcset, dfa->sb_char); #endif /* Build a tree for simple bracket. */ br_token.type = SIMPLE_BRACKET; br_token.opr.sbcset = sbcset; tree = create_token_tree (dfa, NULL, NULL, &br_token); if (BE (tree == NULL, 0)) goto build_word_op_espace; #ifdef RE_ENABLE_I18N if (dfa->mb_cur_max > 1) { bin_tree_t *mbc_tree; /* Build a tree for complex bracket. */ br_token.type = COMPLEX_BRACKET; br_token.opr.mbcset = mbcset; dfa->has_mb_node = 1; mbc_tree = create_token_tree (dfa, NULL, NULL, &br_token); if (BE (mbc_tree == NULL, 0)) goto build_word_op_espace; /* Then join them by ALT node. */ tree = create_tree (dfa, tree, mbc_tree, OP_ALT); if (BE (mbc_tree != NULL, 1)) return tree; } else { free_charset (mbcset); return tree; } #else /* not RE_ENABLE_I18N */ return tree; #endif /* not RE_ENABLE_I18N */ build_word_op_espace: re_free (sbcset); #ifdef RE_ENABLE_I18N free_charset (mbcset); #endif /* RE_ENABLE_I18N */ *err = REG_ESPACE; return NULL; } /* This is intended for the expressions like "a{1,3}". Fetch a number from `input', and return the number. Return -1, if the number field is empty like "{,1}". Return -2, If an error is occured. */ static int fetch_number (re_string_t *input, re_token_t *token, reg_syntax_t syntax) { int num = -1; unsigned char c; while (1) { fetch_token (token, input, syntax); c = token->opr.c; if (BE (token->type == END_OF_RE, 0)) return -2; if (token->type == OP_CLOSE_DUP_NUM || c == ',') break; num = ((token->type != CHARACTER || c < '0' || '9' < c || num == -2) ? -2 : ((num == -1) ? c - '0' : num * 10 + c - '0')); num = (num > RE_DUP_MAX) ? -2 : num; } return num; } #ifdef RE_ENABLE_I18N static void free_charset (re_charset_t *cset) { re_free (cset->mbchars); # ifdef _LIBC re_free (cset->coll_syms); re_free (cset->equiv_classes); re_free (cset->range_starts); re_free (cset->range_ends); # endif re_free (cset->char_classes); re_free (cset); } #endif /* RE_ENABLE_I18N */ /* Functions for binary tree operation. */ /* Create a tree node. */ static bin_tree_t * create_tree (re_dfa_t *dfa, bin_tree_t *left, bin_tree_t *right, re_token_type_t type) { re_token_t t; t.type = type; return create_token_tree (dfa, left, right, &t); } static bin_tree_t * create_token_tree (re_dfa_t *dfa, bin_tree_t *left, bin_tree_t *right, const re_token_t *token) { bin_tree_t *tree; if (BE (dfa->str_tree_storage_idx == BIN_TREE_STORAGE_SIZE, 0)) { bin_tree_storage_t *storage = re_malloc (bin_tree_storage_t, 1); if (storage == NULL) return NULL; storage->next = dfa->str_tree_storage; dfa->str_tree_storage = storage; dfa->str_tree_storage_idx = 0; } tree = &dfa->str_tree_storage->data[dfa->str_tree_storage_idx++]; tree->parent = NULL; tree->left = left; tree->right = right; tree->token = *token; tree->token.duplicated = 0; tree->token.opt_subexp = 0; tree->first = NULL; tree->next = NULL; tree->node_idx = -1; if (left != NULL) left->parent = tree; if (right != NULL) right->parent = tree; return tree; } /* Mark the tree SRC as an optional subexpression. To be called from preorder or postorder. */ static reg_errcode_t mark_opt_subexp (void *extra, bin_tree_t *node) { int idx = (int) (long) extra; if (node->token.type == SUBEXP && node->token.opr.idx == idx) node->token.opt_subexp = 1; return REG_NOERROR; } /* Free the allocated memory inside NODE. */ static void free_token (re_token_t *node) { #ifdef RE_ENABLE_I18N if (node->type == COMPLEX_BRACKET && node->duplicated == 0) free_charset (node->opr.mbcset); else #endif /* RE_ENABLE_I18N */ if (node->type == SIMPLE_BRACKET && node->duplicated == 0) re_free (node->opr.sbcset); } /* Worker function for tree walking. Free the allocated memory inside NODE and its children. */ static reg_errcode_t free_tree (void *extra, bin_tree_t *node) { free_token (&node->token); return REG_NOERROR; } /* Duplicate the node SRC, and return new node. This is a preorder visit similar to the one implemented by the generic visitor, but we need more infrastructure to maintain two parallel trees --- so, it's easier to duplicate. */ static bin_tree_t * duplicate_tree (const bin_tree_t *root, re_dfa_t *dfa) { const bin_tree_t *node; bin_tree_t *dup_root; bin_tree_t **p_new = &dup_root, *dup_node = root->parent; for (node = root; ; ) { /* Create a new tree and link it back to the current parent. */ *p_new = create_token_tree (dfa, NULL, NULL, &node->token); if (*p_new == NULL) return NULL; (*p_new)->parent = dup_node; (*p_new)->token.duplicated = 1; dup_node = *p_new; /* Go to the left node, or up and to the right. */ if (node->left) { node = node->left; p_new = &dup_node->left; } else { const bin_tree_t *prev = NULL; while (node->right == prev || node->right == NULL) { prev = node; node = node->parent; dup_node = dup_node->parent; if (!node) return dup_root; } node = node->right; p_new = &dup_node->right; } } } Index: head/contrib/libgnuregex/regexec.c =================================================================== --- head/contrib/libgnuregex/regexec.c (revision 302831) +++ head/contrib/libgnuregex/regexec.c (revision 302832) @@ -1,4385 +1,4380 @@ /* Extended regular expression matching and search library. Copyright (C) 2002-2005,2007,2009,2010,2011 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Isamu Hasegawa . The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see . */ static reg_errcode_t match_ctx_init (re_match_context_t *cache, int eflags, int n) internal_function; static void match_ctx_clean (re_match_context_t *mctx) internal_function; static void match_ctx_free (re_match_context_t *cache) internal_function; static reg_errcode_t match_ctx_add_entry (re_match_context_t *cache, int node, int str_idx, int from, int to) internal_function; static int search_cur_bkref_entry (const re_match_context_t *mctx, int str_idx) internal_function; static reg_errcode_t match_ctx_add_subtop (re_match_context_t *mctx, int node, int str_idx) internal_function; static re_sub_match_last_t * match_ctx_add_sublast (re_sub_match_top_t *subtop, int node, int str_idx) internal_function; static void sift_ctx_init (re_sift_context_t *sctx, re_dfastate_t **sifted_sts, re_dfastate_t **limited_sts, int last_node, int last_str_idx) internal_function; static reg_errcode_t re_search_internal (const regex_t *preg, const char *string, int length, int start, int range, int stop, size_t nmatch, regmatch_t pmatch[], int eflags) internal_function; static int re_search_2_stub (struct re_pattern_buffer *bufp, const char *string1, int length1, const char *string2, int length2, int start, int range, struct re_registers *regs, int stop, int ret_len) internal_function; static int re_search_stub (struct re_pattern_buffer *bufp, const char *string, int length, int start, int range, int stop, struct re_registers *regs, int ret_len) internal_function; static unsigned re_copy_regs (struct re_registers *regs, regmatch_t *pmatch, int nregs, int regs_allocated) internal_function; static reg_errcode_t prune_impossible_nodes (re_match_context_t *mctx) internal_function; static int check_matching (re_match_context_t *mctx, int fl_longest_match, int *p_match_first) internal_function; static int check_halt_state_context (const re_match_context_t *mctx, const re_dfastate_t *state, int idx) internal_function; static void update_regs (const re_dfa_t *dfa, regmatch_t *pmatch, regmatch_t *prev_idx_match, int cur_node, int cur_idx, int nmatch) internal_function; static reg_errcode_t push_fail_stack (struct re_fail_stack_t *fs, int str_idx, int dest_node, int nregs, regmatch_t *regs, re_node_set *eps_via_nodes) internal_function; static reg_errcode_t set_regs (const regex_t *preg, const re_match_context_t *mctx, size_t nmatch, regmatch_t *pmatch, int fl_backtrack) internal_function; static reg_errcode_t free_fail_stack_return (struct re_fail_stack_t *fs) internal_function; #ifdef RE_ENABLE_I18N static int sift_states_iter_mb (const re_match_context_t *mctx, re_sift_context_t *sctx, int node_idx, int str_idx, int max_str_idx) internal_function; #endif /* RE_ENABLE_I18N */ static reg_errcode_t sift_states_backward (const re_match_context_t *mctx, re_sift_context_t *sctx) internal_function; static reg_errcode_t build_sifted_states (const re_match_context_t *mctx, re_sift_context_t *sctx, int str_idx, re_node_set *cur_dest) internal_function; static reg_errcode_t update_cur_sifted_state (const re_match_context_t *mctx, re_sift_context_t *sctx, int str_idx, re_node_set *dest_nodes) internal_function; static reg_errcode_t add_epsilon_src_nodes (const re_dfa_t *dfa, re_node_set *dest_nodes, const re_node_set *candidates) internal_function; static int check_dst_limits (const re_match_context_t *mctx, re_node_set *limits, int dst_node, int dst_idx, int src_node, int src_idx) internal_function; static int check_dst_limits_calc_pos_1 (const re_match_context_t *mctx, int boundaries, int subexp_idx, int from_node, int bkref_idx) internal_function; static int check_dst_limits_calc_pos (const re_match_context_t *mctx, int limit, int subexp_idx, int node, int str_idx, int bkref_idx) internal_function; static reg_errcode_t check_subexp_limits (const re_dfa_t *dfa, re_node_set *dest_nodes, const re_node_set *candidates, re_node_set *limits, struct re_backref_cache_entry *bkref_ents, int str_idx) internal_function; static reg_errcode_t sift_states_bkref (const re_match_context_t *mctx, re_sift_context_t *sctx, int str_idx, const re_node_set *candidates) internal_function; static reg_errcode_t merge_state_array (const re_dfa_t *dfa, re_dfastate_t **dst, re_dfastate_t **src, int num) internal_function; static re_dfastate_t *find_recover_state (reg_errcode_t *err, re_match_context_t *mctx) internal_function; static re_dfastate_t *transit_state (reg_errcode_t *err, re_match_context_t *mctx, re_dfastate_t *state) internal_function; static re_dfastate_t *merge_state_with_log (reg_errcode_t *err, re_match_context_t *mctx, re_dfastate_t *next_state) internal_function; static reg_errcode_t check_subexp_matching_top (re_match_context_t *mctx, re_node_set *cur_nodes, int str_idx) internal_function; #if 0 static re_dfastate_t *transit_state_sb (reg_errcode_t *err, re_match_context_t *mctx, re_dfastate_t *pstate) internal_function; #endif #ifdef RE_ENABLE_I18N static reg_errcode_t transit_state_mb (re_match_context_t *mctx, re_dfastate_t *pstate) internal_function; #endif /* RE_ENABLE_I18N */ static reg_errcode_t transit_state_bkref (re_match_context_t *mctx, const re_node_set *nodes) internal_function; static reg_errcode_t get_subexp (re_match_context_t *mctx, int bkref_node, int bkref_str_idx) internal_function; static reg_errcode_t get_subexp_sub (re_match_context_t *mctx, const re_sub_match_top_t *sub_top, re_sub_match_last_t *sub_last, int bkref_node, int bkref_str) internal_function; static int find_subexp_node (const re_dfa_t *dfa, const re_node_set *nodes, int subexp_idx, int type) internal_function; static reg_errcode_t check_arrival (re_match_context_t *mctx, state_array_t *path, int top_node, int top_str, int last_node, int last_str, int type) internal_function; static reg_errcode_t check_arrival_add_next_nodes (re_match_context_t *mctx, int str_idx, re_node_set *cur_nodes, re_node_set *next_nodes) internal_function; static reg_errcode_t check_arrival_expand_ecl (const re_dfa_t *dfa, re_node_set *cur_nodes, int ex_subexp, int type) internal_function; static reg_errcode_t check_arrival_expand_ecl_sub (const re_dfa_t *dfa, re_node_set *dst_nodes, int target, int ex_subexp, int type) internal_function; static reg_errcode_t expand_bkref_cache (re_match_context_t *mctx, re_node_set *cur_nodes, int cur_str, int subexp_num, int type) internal_function; static int build_trtable (const re_dfa_t *dfa, re_dfastate_t *state) internal_function; #ifdef RE_ENABLE_I18N static int check_node_accept_bytes (const re_dfa_t *dfa, int node_idx, const re_string_t *input, int idx) internal_function; # ifdef _LIBC static unsigned int find_collation_sequence_value (const unsigned char *mbs, size_t name_len) internal_function; # endif /* _LIBC */ #endif /* RE_ENABLE_I18N */ static int group_nodes_into_DFAstates (const re_dfa_t *dfa, const re_dfastate_t *state, re_node_set *states_node, bitset_t *states_ch) internal_function; static int check_node_accept (const re_match_context_t *mctx, const re_token_t *node, int idx) internal_function; static reg_errcode_t extend_buffers (re_match_context_t *mctx, int min_len) internal_function; /* Entry point for POSIX code. */ /* regexec searches for a given pattern, specified by PREG, in the string STRING. If NMATCH is zero or REG_NOSUB was set in the cflags argument to `regcomp', we ignore PMATCH. Otherwise, we assume PMATCH has at least NMATCH elements, and we set them to the offsets of the corresponding matched substrings. EFLAGS specifies `execution flags' which affect matching: if REG_NOTBOL is set, then ^ does not match at the beginning of the string; if REG_NOTEOL is set, then $ does not match at the end. We return 0 if we find a match and REG_NOMATCH if not. */ int regexec (preg, string, nmatch, pmatch, eflags) const regex_t *__restrict preg; const char *__restrict string; size_t nmatch; regmatch_t pmatch[]; int eflags; { reg_errcode_t err; int start, length; re_dfa_t *dfa = (re_dfa_t *) preg->buffer; if (eflags & ~(REG_NOTBOL | REG_NOTEOL | REG_STARTEND)) return REG_BADPAT; if (eflags & REG_STARTEND) { start = pmatch[0].rm_so; length = pmatch[0].rm_eo; } else { start = 0; length = strlen (string); } __libc_lock_lock (dfa->lock); if (preg->no_sub) err = re_search_internal (preg, string, length, start, length - start, length, 0, NULL, eflags); else err = re_search_internal (preg, string, length, start, length - start, length, nmatch, pmatch, eflags); __libc_lock_unlock (dfa->lock); return err != REG_NOERROR; } #ifdef _LIBC # include versioned_symbol (libc, __regexec, regexec, GLIBC_2_3_4); # if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_3_4) __typeof__ (__regexec) __compat_regexec; int attribute_compat_text_section __compat_regexec (const regex_t *__restrict preg, const char *__restrict string, size_t nmatch, regmatch_t pmatch[], int eflags) { return regexec (preg, string, nmatch, pmatch, eflags & (REG_NOTBOL | REG_NOTEOL)); } compat_symbol (libc, __compat_regexec, regexec, GLIBC_2_0); # endif #endif /* Entry points for GNU code. */ /* re_match, re_search, re_match_2, re_search_2 The former two functions operate on STRING with length LENGTH, while the later two operate on concatenation of STRING1 and STRING2 with lengths LENGTH1 and LENGTH2, respectively. re_match() matches the compiled pattern in BUFP against the string, starting at index START. re_search() first tries matching at index START, then it tries to match starting from index START + 1, and so on. The last start position tried is START + RANGE. (Thus RANGE = 0 forces re_search to operate the same way as re_match().) The parameter STOP of re_{match,search}_2 specifies that no match exceeding the first STOP characters of the concatenation of the strings should be concerned. If REGS is not NULL, and BUFP->no_sub is not set, the offsets of the match and all groups is stroed in REGS. (For the "_2" variants, the offsets are computed relative to the concatenation, not relative to the individual strings.) On success, re_match* functions return the length of the match, re_search* return the position of the start of the match. Return value -1 means no match was found and -2 indicates an internal error. */ int re_match (bufp, string, length, start, regs) struct re_pattern_buffer *bufp; const char *string; int length, start; struct re_registers *regs; { return re_search_stub (bufp, string, length, start, 0, length, regs, 1); } #ifdef _LIBC weak_alias (__re_match, re_match) #endif int re_search (bufp, string, length, start, range, regs) struct re_pattern_buffer *bufp; const char *string; int length, start, range; struct re_registers *regs; { return re_search_stub (bufp, string, length, start, range, length, regs, 0); } #ifdef _LIBC weak_alias (__re_search, re_search) #endif int re_match_2 (bufp, string1, length1, string2, length2, start, regs, stop) struct re_pattern_buffer *bufp; const char *string1, *string2; int length1, length2, start, stop; struct re_registers *regs; { return re_search_2_stub (bufp, string1, length1, string2, length2, start, 0, regs, stop, 1); } #ifdef _LIBC weak_alias (__re_match_2, re_match_2) #endif int re_search_2 (bufp, string1, length1, string2, length2, start, range, regs, stop) struct re_pattern_buffer *bufp; const char *string1, *string2; int length1, length2, start, range, stop; struct re_registers *regs; { return re_search_2_stub (bufp, string1, length1, string2, length2, start, range, regs, stop, 0); } #ifdef _LIBC weak_alias (__re_search_2, re_search_2) #endif static int re_search_2_stub (bufp, string1, length1, string2, length2, start, range, regs, stop, ret_len) struct re_pattern_buffer *bufp; const char *string1, *string2; int length1, length2, start, range, stop, ret_len; struct re_registers *regs; { const char *str; int rval; int len = length1 + length2; char *s = NULL; if (BE (length1 < 0 || length2 < 0 || stop < 0 || len < length1, 0)) return -2; /* Concatenate the strings. */ if (length2 > 0) if (length1 > 0) { s = re_malloc (char, len); if (BE (s == NULL, 0)) return -2; #ifdef _LIBC memcpy (__mempcpy (s, string1, length1), string2, length2); #else memcpy (s, string1, length1); memcpy (s + length1, string2, length2); #endif str = s; } else str = string2; else str = string1; rval = re_search_stub (bufp, str, len, start, range, stop, regs, ret_len); re_free (s); return rval; } /* The parameters have the same meaning as those of re_search. Additional parameters: If RET_LEN is nonzero the length of the match is returned (re_match style); otherwise the position of the match is returned. */ static int re_search_stub (bufp, string, length, start, range, stop, regs, ret_len) struct re_pattern_buffer *bufp; const char *string; int length, start, range, stop, ret_len; struct re_registers *regs; { reg_errcode_t result; regmatch_t *pmatch; int nregs, rval; int eflags = 0; re_dfa_t *dfa = (re_dfa_t *) bufp->buffer; /* Check for out-of-range. */ if (BE (start < 0 || start > length, 0)) return -1; if (BE (start + range > length, 0)) range = length - start; else if (BE (start + range < 0, 0)) range = -start; __libc_lock_lock (dfa->lock); eflags |= (bufp->not_bol) ? REG_NOTBOL : 0; eflags |= (bufp->not_eol) ? REG_NOTEOL : 0; /* Compile fastmap if we haven't yet. */ if (range > 0 && bufp->fastmap != NULL && !bufp->fastmap_accurate) re_compile_fastmap (bufp); if (BE (bufp->no_sub, 0)) regs = NULL; /* We need at least 1 register. */ if (regs == NULL) nregs = 1; else if (BE (bufp->regs_allocated == REGS_FIXED && regs->num_regs < bufp->re_nsub + 1, 0)) { nregs = regs->num_regs; if (BE (nregs < 1, 0)) { /* Nothing can be copied to regs. */ regs = NULL; nregs = 1; } } else nregs = bufp->re_nsub + 1; pmatch = re_malloc (regmatch_t, nregs); if (BE (pmatch == NULL, 0)) { rval = -2; goto out; } result = re_search_internal (bufp, string, length, start, range, stop, nregs, pmatch, eflags); rval = 0; /* I hope we needn't fill ther regs with -1's when no match was found. */ if (result != REG_NOERROR) rval = -1; else if (regs != NULL) { /* If caller wants register contents data back, copy them. */ bufp->regs_allocated = re_copy_regs (regs, pmatch, nregs, bufp->regs_allocated); if (BE (bufp->regs_allocated == REGS_UNALLOCATED, 0)) rval = -2; } if (BE (rval == 0, 1)) { if (ret_len) { assert (pmatch[0].rm_so == start); rval = pmatch[0].rm_eo - start; } else rval = pmatch[0].rm_so; } re_free (pmatch); out: __libc_lock_unlock (dfa->lock); return rval; } static unsigned re_copy_regs (regs, pmatch, nregs, regs_allocated) struct re_registers *regs; regmatch_t *pmatch; int nregs, regs_allocated; { int rval = REGS_REALLOCATE; int i; int need_regs = nregs + 1; /* We need one extra element beyond `num_regs' for the `-1' marker GNU code uses. */ /* Have the register data arrays been allocated? */ if (regs_allocated == REGS_UNALLOCATED) { /* No. So allocate them with malloc. */ regs->start = re_malloc (regoff_t, need_regs); if (BE (regs->start == NULL, 0)) return REGS_UNALLOCATED; regs->end = re_malloc (regoff_t, need_regs); if (BE (regs->end == NULL, 0)) { re_free (regs->start); return REGS_UNALLOCATED; } regs->num_regs = need_regs; } else if (regs_allocated == REGS_REALLOCATE) { /* Yes. If we need more elements than were already allocated, reallocate them. If we need fewer, just leave it alone. */ if (BE (need_regs > regs->num_regs, 0)) { regoff_t *new_start = re_realloc (regs->start, regoff_t, need_regs); regoff_t *new_end; if (BE (new_start == NULL, 0)) return REGS_UNALLOCATED; new_end = re_realloc (regs->end, regoff_t, need_regs); if (BE (new_end == NULL, 0)) { re_free (new_start); return REGS_UNALLOCATED; } regs->start = new_start; regs->end = new_end; regs->num_regs = need_regs; } } else { assert (regs_allocated == REGS_FIXED); /* This function may not be called with REGS_FIXED and nregs too big. */ assert (regs->num_regs >= nregs); rval = REGS_FIXED; } /* Copy the regs. */ for (i = 0; i < nregs; ++i) { regs->start[i] = pmatch[i].rm_so; regs->end[i] = pmatch[i].rm_eo; } for ( ; i < regs->num_regs; ++i) regs->start[i] = regs->end[i] = -1; return rval; } /* Set REGS to hold NUM_REGS registers, storing them in STARTS and ENDS. Subsequent matches using PATTERN_BUFFER and REGS will use this memory for recording register information. STARTS and ENDS must be allocated using the malloc library routine, and must each be at least NUM_REGS * sizeof (regoff_t) bytes long. If NUM_REGS == 0, then subsequent matches should allocate their own register data. Unless this function is called, the first search or match using PATTERN_BUFFER will allocate its own register data, without freeing the old data. */ void re_set_registers (bufp, regs, num_regs, starts, ends) struct re_pattern_buffer *bufp; struct re_registers *regs; unsigned num_regs; regoff_t *starts, *ends; { if (num_regs) { bufp->regs_allocated = REGS_REALLOCATE; regs->num_regs = num_regs; regs->start = starts; regs->end = ends; } else { bufp->regs_allocated = REGS_UNALLOCATED; regs->num_regs = 0; regs->start = regs->end = (regoff_t *) 0; } } #ifdef _LIBC weak_alias (__re_set_registers, re_set_registers) #endif /* Entry points compatible with 4.2 BSD regex library. We don't define them unless specifically requested. */ #if defined _REGEX_RE_COMP || defined _LIBC int # ifdef _LIBC weak_function # endif re_exec (s) const char *s; { return 0 == regexec (&re_comp_buf, s, 0, NULL, 0); } #endif /* _REGEX_RE_COMP */ /* Internal entry point. */ /* Searches for a compiled pattern PREG in the string STRING, whose length is LENGTH. NMATCH, PMATCH, and EFLAGS have the same mingings with regexec. START, and RANGE have the same meanings with re_search. Return REG_NOERROR if we find a match, and REG_NOMATCH if not, otherwise return the error code. Note: We assume front end functions already check ranges. (START + RANGE >= 0 && START + RANGE <= LENGTH) */ static reg_errcode_t __attribute_warn_unused_result__ re_search_internal (preg, string, length, start, range, stop, nmatch, pmatch, eflags) const regex_t *preg; const char *string; int length, start, range, stop, eflags; size_t nmatch; regmatch_t pmatch[]; { reg_errcode_t err; const re_dfa_t *dfa = (const re_dfa_t *) preg->buffer; int left_lim, right_lim, incr; int fl_longest_match, match_first, match_kind, match_last = -1; int extra_nmatch; int sb, ch; #if defined _LIBC || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L) re_match_context_t mctx = { .dfa = dfa }; #else re_match_context_t mctx; #endif char *fastmap = (preg->fastmap != NULL && preg->fastmap_accurate && range && !preg->can_be_null) ? preg->fastmap : NULL; RE_TRANSLATE_TYPE t = preg->translate; #if !(defined _LIBC || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)) memset (&mctx, '\0', sizeof (re_match_context_t)); mctx.dfa = dfa; #endif extra_nmatch = (nmatch > preg->re_nsub) ? nmatch - (preg->re_nsub + 1) : 0; nmatch -= extra_nmatch; /* Check if the DFA haven't been compiled. */ if (BE (preg->used == 0 || dfa->init_state == NULL || dfa->init_state_word == NULL || dfa->init_state_nl == NULL || dfa->init_state_begbuf == NULL, 0)) return REG_NOMATCH; #ifdef DEBUG /* We assume front-end functions already check them. */ assert (start + range >= 0 && start + range <= length); #endif /* If initial states with non-begbuf contexts have no elements, the regex must be anchored. If preg->newline_anchor is set, we'll never use init_state_nl, so do not check it. */ if (dfa->init_state->nodes.nelem == 0 && dfa->init_state_word->nodes.nelem == 0 && (dfa->init_state_nl->nodes.nelem == 0 || !preg->newline_anchor)) { if (start != 0 && start + range != 0) return REG_NOMATCH; start = range = 0; } /* We must check the longest matching, if nmatch > 0. */ fl_longest_match = (nmatch != 0 || dfa->nbackref); err = re_string_allocate (&mctx.input, string, length, dfa->nodes_len + 1, preg->translate, preg->syntax & RE_ICASE, dfa); if (BE (err != REG_NOERROR, 0)) goto free_return; mctx.input.stop = stop; mctx.input.raw_stop = stop; mctx.input.newline_anchor = preg->newline_anchor; err = match_ctx_init (&mctx, eflags, dfa->nbackref * 2); if (BE (err != REG_NOERROR, 0)) goto free_return; /* We will log all the DFA states through which the dfa pass, if nmatch > 1, or this dfa has "multibyte node", which is a back-reference or a node which can accept multibyte character or multi character collating element. */ if (nmatch > 1 || dfa->has_mb_node) { /* Avoid overflow. */ if (BE (SIZE_MAX / sizeof (re_dfastate_t *) <= mctx.input.bufs_len, 0)) { err = REG_ESPACE; goto free_return; } mctx.state_log = re_malloc (re_dfastate_t *, mctx.input.bufs_len + 1); if (BE (mctx.state_log == NULL, 0)) { err = REG_ESPACE; goto free_return; } } else mctx.state_log = NULL; match_first = start; mctx.input.tip_context = (eflags & REG_NOTBOL) ? CONTEXT_BEGBUF : CONTEXT_NEWLINE | CONTEXT_BEGBUF; /* Check incrementally whether of not the input string match. */ incr = (range < 0) ? -1 : 1; left_lim = (range < 0) ? start + range : start; right_lim = (range < 0) ? start : start + range; sb = dfa->mb_cur_max == 1; match_kind = (fastmap ? ((sb || !(preg->syntax & RE_ICASE || t) ? 4 : 0) | (range >= 0 ? 2 : 0) | (t != NULL ? 1 : 0)) : 8); for (;; match_first += incr) { err = REG_NOMATCH; if (match_first < left_lim || right_lim < match_first) goto free_return; /* Advance as rapidly as possible through the string, until we find a plausible place to start matching. This may be done with varying efficiency, so there are various possibilities: only the most common of them are specialized, in order to save on code size. We use a switch statement for speed. */ switch (match_kind) { case 8: /* No fastmap. */ break; case 7: /* Fastmap with single-byte translation, match forward. */ while (BE (match_first < right_lim, 1) && !fastmap[t[(unsigned char) string[match_first]]]) ++match_first; goto forward_match_found_start_or_reached_end; case 6: /* Fastmap without translation, match forward. */ while (BE (match_first < right_lim, 1) && !fastmap[(unsigned char) string[match_first]]) ++match_first; forward_match_found_start_or_reached_end: if (BE (match_first == right_lim, 0)) { ch = match_first >= length ? 0 : (unsigned char) string[match_first]; if (!fastmap[t ? t[ch] : ch]) goto free_return; } break; case 4: case 5: /* Fastmap without multi-byte translation, match backwards. */ while (match_first >= left_lim) { ch = match_first >= length ? 0 : (unsigned char) string[match_first]; if (fastmap[t ? t[ch] : ch]) break; --match_first; } if (match_first < left_lim) goto free_return; break; default: /* In this case, we can't determine easily the current byte, since it might be a component byte of a multibyte character. Then we use the constructed buffer instead. */ for (;;) { /* If MATCH_FIRST is out of the valid range, reconstruct the buffers. */ unsigned int offset = match_first - mctx.input.raw_mbs_idx; if (BE (offset >= (unsigned int) mctx.input.valid_raw_len, 0)) { err = re_string_reconstruct (&mctx.input, match_first, eflags); if (BE (err != REG_NOERROR, 0)) goto free_return; offset = match_first - mctx.input.raw_mbs_idx; } /* If MATCH_FIRST is out of the buffer, leave it as '\0'. Note that MATCH_FIRST must not be smaller than 0. */ ch = (match_first >= length ? 0 : re_string_byte_at (&mctx.input, offset)); if (fastmap[ch]) break; match_first += incr; if (match_first < left_lim || match_first > right_lim) { err = REG_NOMATCH; goto free_return; } } break; } /* Reconstruct the buffers so that the matcher can assume that the matching starts from the beginning of the buffer. */ err = re_string_reconstruct (&mctx.input, match_first, eflags); if (BE (err != REG_NOERROR, 0)) goto free_return; #ifdef RE_ENABLE_I18N /* Don't consider this char as a possible match start if it part, yet isn't the head, of a multibyte character. */ if (!sb && !re_string_first_byte (&mctx.input, 0)) continue; #endif /* It seems to be appropriate one, then use the matcher. */ /* We assume that the matching starts from 0. */ mctx.state_log_top = mctx.nbkref_ents = mctx.max_mb_elem_len = 0; match_last = check_matching (&mctx, fl_longest_match, range >= 0 ? &match_first : NULL); if (match_last != -1) { if (BE (match_last == -2, 0)) { err = REG_ESPACE; goto free_return; } else { mctx.match_last = match_last; if ((!preg->no_sub && nmatch > 1) || dfa->nbackref) { re_dfastate_t *pstate = mctx.state_log[match_last]; mctx.last_node = check_halt_state_context (&mctx, pstate, match_last); } if ((!preg->no_sub && nmatch > 1 && dfa->has_plural_match) || dfa->nbackref) { err = prune_impossible_nodes (&mctx); if (err == REG_NOERROR) break; if (BE (err != REG_NOMATCH, 0)) goto free_return; match_last = -1; } else break; /* We found a match. */ } } match_ctx_clean (&mctx); } #ifdef DEBUG assert (match_last != -1); assert (err == REG_NOERROR); #endif /* Set pmatch[] if we need. */ if (nmatch > 0) { int reg_idx; /* Initialize registers. */ for (reg_idx = 1; reg_idx < nmatch; ++reg_idx) pmatch[reg_idx].rm_so = pmatch[reg_idx].rm_eo = -1; /* Set the points where matching start/end. */ pmatch[0].rm_so = 0; pmatch[0].rm_eo = mctx.match_last; if (!preg->no_sub && nmatch > 1) { err = set_regs (preg, &mctx, nmatch, pmatch, dfa->has_plural_match && dfa->nbackref > 0); if (BE (err != REG_NOERROR, 0)) goto free_return; } /* At last, add the offset to the each registers, since we slided the buffers so that we could assume that the matching starts from 0. */ for (reg_idx = 0; reg_idx < nmatch; ++reg_idx) if (pmatch[reg_idx].rm_so != -1) { #ifdef RE_ENABLE_I18N if (BE (mctx.input.offsets_needed != 0, 0)) { pmatch[reg_idx].rm_so = (pmatch[reg_idx].rm_so == mctx.input.valid_len ? mctx.input.valid_raw_len : mctx.input.offsets[pmatch[reg_idx].rm_so]); pmatch[reg_idx].rm_eo = (pmatch[reg_idx].rm_eo == mctx.input.valid_len ? mctx.input.valid_raw_len : mctx.input.offsets[pmatch[reg_idx].rm_eo]); } #else assert (mctx.input.offsets_needed == 0); #endif pmatch[reg_idx].rm_so += match_first; pmatch[reg_idx].rm_eo += match_first; } for (reg_idx = 0; reg_idx < extra_nmatch; ++reg_idx) { pmatch[nmatch + reg_idx].rm_so = -1; pmatch[nmatch + reg_idx].rm_eo = -1; } if (dfa->subexp_map) for (reg_idx = 0; reg_idx + 1 < nmatch; reg_idx++) if (dfa->subexp_map[reg_idx] != reg_idx) { pmatch[reg_idx + 1].rm_so = pmatch[dfa->subexp_map[reg_idx] + 1].rm_so; pmatch[reg_idx + 1].rm_eo = pmatch[dfa->subexp_map[reg_idx] + 1].rm_eo; } } free_return: re_free (mctx.state_log); if (dfa->nbackref) match_ctx_free (&mctx); re_string_destruct (&mctx.input); return err; } static reg_errcode_t __attribute_warn_unused_result__ prune_impossible_nodes (mctx) re_match_context_t *mctx; { const re_dfa_t *const dfa = mctx->dfa; int halt_node, match_last; reg_errcode_t ret; re_dfastate_t **sifted_states; re_dfastate_t **lim_states = NULL; re_sift_context_t sctx; #ifdef DEBUG assert (mctx->state_log != NULL); #endif match_last = mctx->match_last; halt_node = mctx->last_node; /* Avoid overflow. */ if (BE (SIZE_MAX / sizeof (re_dfastate_t *) <= match_last, 0)) return REG_ESPACE; sifted_states = re_malloc (re_dfastate_t *, match_last + 1); if (BE (sifted_states == NULL, 0)) { ret = REG_ESPACE; goto free_return; } if (dfa->nbackref) { lim_states = re_malloc (re_dfastate_t *, match_last + 1); if (BE (lim_states == NULL, 0)) { ret = REG_ESPACE; goto free_return; } while (1) { memset (lim_states, '\0', sizeof (re_dfastate_t *) * (match_last + 1)); sift_ctx_init (&sctx, sifted_states, lim_states, halt_node, match_last); ret = sift_states_backward (mctx, &sctx); re_node_set_free (&sctx.limits); if (BE (ret != REG_NOERROR, 0)) goto free_return; if (sifted_states[0] != NULL || lim_states[0] != NULL) break; do { --match_last; if (match_last < 0) { ret = REG_NOMATCH; goto free_return; } } while (mctx->state_log[match_last] == NULL || !mctx->state_log[match_last]->halt); halt_node = check_halt_state_context (mctx, mctx->state_log[match_last], match_last); } ret = merge_state_array (dfa, sifted_states, lim_states, match_last + 1); re_free (lim_states); lim_states = NULL; if (BE (ret != REG_NOERROR, 0)) goto free_return; } else { sift_ctx_init (&sctx, sifted_states, lim_states, halt_node, match_last); ret = sift_states_backward (mctx, &sctx); re_node_set_free (&sctx.limits); if (BE (ret != REG_NOERROR, 0)) goto free_return; if (sifted_states[0] == NULL) { ret = REG_NOMATCH; goto free_return; } } re_free (mctx->state_log); mctx->state_log = sifted_states; sifted_states = NULL; mctx->last_node = halt_node; mctx->match_last = match_last; ret = REG_NOERROR; free_return: re_free (sifted_states); re_free (lim_states); return ret; } /* Acquire an initial state and return it. We must select appropriate initial state depending on the context, since initial states may have constraints like "\<", "^", etc.. */ static inline re_dfastate_t * __attribute ((always_inline)) internal_function acquire_init_state_context (reg_errcode_t *err, const re_match_context_t *mctx, int idx) { const re_dfa_t *const dfa = mctx->dfa; if (dfa->init_state->has_constraint) { unsigned int context; context = re_string_context_at (&mctx->input, idx - 1, mctx->eflags); if (IS_WORD_CONTEXT (context)) return dfa->init_state_word; else if (IS_ORDINARY_CONTEXT (context)) return dfa->init_state; else if (IS_BEGBUF_CONTEXT (context) && IS_NEWLINE_CONTEXT (context)) return dfa->init_state_begbuf; else if (IS_NEWLINE_CONTEXT (context)) return dfa->init_state_nl; else if (IS_BEGBUF_CONTEXT (context)) { /* It is relatively rare case, then calculate on demand. */ return re_acquire_state_context (err, dfa, dfa->init_state->entrance_nodes, context); } else /* Must not happen? */ return dfa->init_state; } else return dfa->init_state; } /* Check whether the regular expression match input string INPUT or not, and return the index where the matching end, return -1 if not match, or return -2 in case of an error. FL_LONGEST_MATCH means we want the POSIX longest matching. If P_MATCH_FIRST is not NULL, and the match fails, it is set to the next place where we may want to try matching. Note that the matcher assume that the maching starts from the current index of the buffer. */ static int internal_function __attribute_warn_unused_result__ check_matching (re_match_context_t *mctx, int fl_longest_match, int *p_match_first) { const re_dfa_t *const dfa = mctx->dfa; reg_errcode_t err; int match = 0; int match_last = -1; int cur_str_idx = re_string_cur_idx (&mctx->input); re_dfastate_t *cur_state; int at_init_state = p_match_first != NULL; int next_start_idx = cur_str_idx; err = REG_NOERROR; cur_state = acquire_init_state_context (&err, mctx, cur_str_idx); /* An initial state must not be NULL (invalid). */ if (BE (cur_state == NULL, 0)) { assert (err == REG_ESPACE); return -2; } if (mctx->state_log != NULL) { mctx->state_log[cur_str_idx] = cur_state; /* Check OP_OPEN_SUBEXP in the initial state in case that we use them later. E.g. Processing back references. */ if (BE (dfa->nbackref, 0)) { at_init_state = 0; err = check_subexp_matching_top (mctx, &cur_state->nodes, 0); if (BE (err != REG_NOERROR, 0)) return err; if (cur_state->has_backref) { err = transit_state_bkref (mctx, &cur_state->nodes); if (BE (err != REG_NOERROR, 0)) return err; } } } /* If the RE accepts NULL string. */ if (BE (cur_state->halt, 0)) { if (!cur_state->has_constraint || check_halt_state_context (mctx, cur_state, cur_str_idx)) { if (!fl_longest_match) return cur_str_idx; else { match_last = cur_str_idx; match = 1; } } } while (!re_string_eoi (&mctx->input)) { re_dfastate_t *old_state = cur_state; int next_char_idx = re_string_cur_idx (&mctx->input) + 1; if ((BE (next_char_idx >= mctx->input.bufs_len, 0) && mctx->input.bufs_len < mctx->input.len) || (BE (next_char_idx >= mctx->input.valid_len, 0) && mctx->input.valid_len < mctx->input.len)) { err = extend_buffers (mctx, next_char_idx + 1); if (BE (err != REG_NOERROR, 0)) { assert (err == REG_ESPACE); return -2; } } cur_state = transit_state (&err, mctx, cur_state); if (mctx->state_log != NULL) cur_state = merge_state_with_log (&err, mctx, cur_state); if (cur_state == NULL) { /* Reached the invalid state or an error. Try to recover a valid state using the state log, if available and if we have not already found a valid (even if not the longest) match. */ if (BE (err != REG_NOERROR, 0)) return -2; if (mctx->state_log == NULL || (match && !fl_longest_match) || (cur_state = find_recover_state (&err, mctx)) == NULL) break; } if (BE (at_init_state, 0)) { if (old_state == cur_state) next_start_idx = next_char_idx; else at_init_state = 0; } if (cur_state->halt) { /* Reached a halt state. Check the halt state can satisfy the current context. */ if (!cur_state->has_constraint || check_halt_state_context (mctx, cur_state, re_string_cur_idx (&mctx->input))) { /* We found an appropriate halt state. */ match_last = re_string_cur_idx (&mctx->input); match = 1; /* We found a match, do not modify match_first below. */ p_match_first = NULL; if (!fl_longest_match) break; } } } if (p_match_first) *p_match_first += next_start_idx; return match_last; } /* Check NODE match the current context. */ static int internal_function check_halt_node_context (const re_dfa_t *dfa, int node, unsigned int context) { re_token_type_t type = dfa->nodes[node].type; unsigned int constraint = dfa->nodes[node].constraint; if (type != END_OF_RE) return 0; if (!constraint) return 1; if (NOT_SATISFY_NEXT_CONSTRAINT (constraint, context)) return 0; return 1; } /* Check the halt state STATE match the current context. Return 0 if not match, if the node, STATE has, is a halt node and match the context, return the node. */ static int internal_function check_halt_state_context (const re_match_context_t *mctx, const re_dfastate_t *state, int idx) { int i; unsigned int context; #ifdef DEBUG assert (state->halt); #endif context = re_string_context_at (&mctx->input, idx, mctx->eflags); for (i = 0; i < state->nodes.nelem; ++i) if (check_halt_node_context (mctx->dfa, state->nodes.elems[i], context)) return state->nodes.elems[i]; return 0; } /* Compute the next node to which "NFA" transit from NODE("NFA" is a NFA corresponding to the DFA). Return the destination node, and update EPS_VIA_NODES, return -1 in case of errors. */ static int internal_function proceed_next_node (const re_match_context_t *mctx, int nregs, regmatch_t *regs, int *pidx, int node, re_node_set *eps_via_nodes, struct re_fail_stack_t *fs) { const re_dfa_t *const dfa = mctx->dfa; int i, err; if (IS_EPSILON_NODE (dfa->nodes[node].type)) { re_node_set *cur_nodes = &mctx->state_log[*pidx]->nodes; re_node_set *edests = &dfa->edests[node]; int dest_node; err = re_node_set_insert (eps_via_nodes, node); if (BE (err < 0, 0)) return -2; /* Pick up a valid destination, or return -1 if none is found. */ for (dest_node = -1, i = 0; i < edests->nelem; ++i) { int candidate = edests->elems[i]; if (!re_node_set_contains (cur_nodes, candidate)) continue; if (dest_node == -1) dest_node = candidate; else { /* In order to avoid infinite loop like "(a*)*", return the second epsilon-transition if the first was already considered. */ if (re_node_set_contains (eps_via_nodes, dest_node)) return candidate; /* Otherwise, push the second epsilon-transition on the fail stack. */ else if (fs != NULL && push_fail_stack (fs, *pidx, candidate, nregs, regs, eps_via_nodes)) return -2; /* We know we are going to exit. */ break; } } return dest_node; } else { int naccepted = 0; re_token_type_t type = dfa->nodes[node].type; #ifdef RE_ENABLE_I18N if (dfa->nodes[node].accept_mb) naccepted = check_node_accept_bytes (dfa, node, &mctx->input, *pidx); else #endif /* RE_ENABLE_I18N */ if (type == OP_BACK_REF) { int subexp_idx = dfa->nodes[node].opr.idx + 1; naccepted = regs[subexp_idx].rm_eo - regs[subexp_idx].rm_so; if (fs != NULL) { if (regs[subexp_idx].rm_so == -1 || regs[subexp_idx].rm_eo == -1) return -1; else if (naccepted) { char *buf = (char *) re_string_get_buffer (&mctx->input); if (memcmp (buf + regs[subexp_idx].rm_so, buf + *pidx, naccepted) != 0) return -1; } } if (naccepted == 0) { int dest_node; err = re_node_set_insert (eps_via_nodes, node); if (BE (err < 0, 0)) return -2; dest_node = dfa->edests[node].elems[0]; if (re_node_set_contains (&mctx->state_log[*pidx]->nodes, dest_node)) return dest_node; } } if (naccepted != 0 || check_node_accept (mctx, dfa->nodes + node, *pidx)) { int dest_node = dfa->nexts[node]; *pidx = (naccepted == 0) ? *pidx + 1 : *pidx + naccepted; if (fs && (*pidx > mctx->match_last || mctx->state_log[*pidx] == NULL || !re_node_set_contains (&mctx->state_log[*pidx]->nodes, dest_node))) return -1; re_node_set_empty (eps_via_nodes); return dest_node; } } return -1; } static reg_errcode_t internal_function __attribute_warn_unused_result__ push_fail_stack (struct re_fail_stack_t *fs, int str_idx, int dest_node, int nregs, regmatch_t *regs, re_node_set *eps_via_nodes) { reg_errcode_t err; int num = fs->num++; if (fs->num == fs->alloc) { struct re_fail_stack_ent_t *new_array; new_array = realloc (fs->stack, (sizeof (struct re_fail_stack_ent_t) * fs->alloc * 2)); if (new_array == NULL) return REG_ESPACE; fs->alloc *= 2; fs->stack = new_array; } fs->stack[num].idx = str_idx; fs->stack[num].node = dest_node; fs->stack[num].regs = re_malloc (regmatch_t, nregs); if (fs->stack[num].regs == NULL) return REG_ESPACE; memcpy (fs->stack[num].regs, regs, sizeof (regmatch_t) * nregs); err = re_node_set_init_copy (&fs->stack[num].eps_via_nodes, eps_via_nodes); return err; } static int internal_function pop_fail_stack (struct re_fail_stack_t *fs, int *pidx, int nregs, regmatch_t *regs, re_node_set *eps_via_nodes) { int num = --fs->num; assert (num >= 0); *pidx = fs->stack[num].idx; memcpy (regs, fs->stack[num].regs, sizeof (regmatch_t) * nregs); re_node_set_free (eps_via_nodes); re_free (fs->stack[num].regs); *eps_via_nodes = fs->stack[num].eps_via_nodes; return fs->stack[num].node; } /* Set the positions where the subexpressions are starts/ends to registers PMATCH. Note: We assume that pmatch[0] is already set, and pmatch[i].rm_so == pmatch[i].rm_eo == -1 for 0 < i < nmatch. */ static reg_errcode_t internal_function __attribute_warn_unused_result__ set_regs (const regex_t *preg, const re_match_context_t *mctx, size_t nmatch, regmatch_t *pmatch, int fl_backtrack) { const re_dfa_t *dfa = (const re_dfa_t *) preg->buffer; int idx, cur_node; re_node_set eps_via_nodes; struct re_fail_stack_t *fs; struct re_fail_stack_t fs_body = { 0, 2, NULL }; regmatch_t *prev_idx_match; int prev_idx_match_malloced = 0; #ifdef DEBUG assert (nmatch > 1); assert (mctx->state_log != NULL); #endif if (fl_backtrack) { fs = &fs_body; fs->stack = re_malloc (struct re_fail_stack_ent_t, fs->alloc); if (fs->stack == NULL) return REG_ESPACE; } else fs = NULL; cur_node = dfa->init_node; re_node_set_init_empty (&eps_via_nodes); if (__libc_use_alloca (nmatch * sizeof (regmatch_t))) prev_idx_match = (regmatch_t *) alloca (nmatch * sizeof (regmatch_t)); else { prev_idx_match = re_malloc (regmatch_t, nmatch); if (prev_idx_match == NULL) { free_fail_stack_return (fs); return REG_ESPACE; } prev_idx_match_malloced = 1; } memcpy (prev_idx_match, pmatch, sizeof (regmatch_t) * nmatch); for (idx = pmatch[0].rm_so; idx <= pmatch[0].rm_eo ;) { update_regs (dfa, pmatch, prev_idx_match, cur_node, idx, nmatch); if (idx == pmatch[0].rm_eo && cur_node == mctx->last_node) { int reg_idx; if (fs) { for (reg_idx = 0; reg_idx < nmatch; ++reg_idx) if (pmatch[reg_idx].rm_so > -1 && pmatch[reg_idx].rm_eo == -1) break; if (reg_idx == nmatch) { re_node_set_free (&eps_via_nodes); if (prev_idx_match_malloced) re_free (prev_idx_match); return free_fail_stack_return (fs); } cur_node = pop_fail_stack (fs, &idx, nmatch, pmatch, &eps_via_nodes); } else { re_node_set_free (&eps_via_nodes); if (prev_idx_match_malloced) re_free (prev_idx_match); return REG_NOERROR; } } /* Proceed to next node. */ cur_node = proceed_next_node (mctx, nmatch, pmatch, &idx, cur_node, &eps_via_nodes, fs); if (BE (cur_node < 0, 0)) { if (BE (cur_node == -2, 0)) { re_node_set_free (&eps_via_nodes); if (prev_idx_match_malloced) re_free (prev_idx_match); free_fail_stack_return (fs); return REG_ESPACE; } if (fs) cur_node = pop_fail_stack (fs, &idx, nmatch, pmatch, &eps_via_nodes); else { re_node_set_free (&eps_via_nodes); if (prev_idx_match_malloced) re_free (prev_idx_match); return REG_NOMATCH; } } } re_node_set_free (&eps_via_nodes); if (prev_idx_match_malloced) re_free (prev_idx_match); return free_fail_stack_return (fs); } static reg_errcode_t internal_function free_fail_stack_return (struct re_fail_stack_t *fs) { if (fs) { int fs_idx; for (fs_idx = 0; fs_idx < fs->num; ++fs_idx) { re_node_set_free (&fs->stack[fs_idx].eps_via_nodes); re_free (fs->stack[fs_idx].regs); } re_free (fs->stack); } return REG_NOERROR; } static void internal_function update_regs (const re_dfa_t *dfa, regmatch_t *pmatch, regmatch_t *prev_idx_match, int cur_node, int cur_idx, int nmatch) { int type = dfa->nodes[cur_node].type; if (type == OP_OPEN_SUBEXP) { int reg_num = dfa->nodes[cur_node].opr.idx + 1; /* We are at the first node of this sub expression. */ if (reg_num < nmatch) { pmatch[reg_num].rm_so = cur_idx; pmatch[reg_num].rm_eo = -1; } } else if (type == OP_CLOSE_SUBEXP) { int reg_num = dfa->nodes[cur_node].opr.idx + 1; if (reg_num < nmatch) { /* We are at the last node of this sub expression. */ if (pmatch[reg_num].rm_so < cur_idx) { pmatch[reg_num].rm_eo = cur_idx; /* This is a non-empty match or we are not inside an optional subexpression. Accept this right away. */ memcpy (prev_idx_match, pmatch, sizeof (regmatch_t) * nmatch); } else { if (dfa->nodes[cur_node].opt_subexp && prev_idx_match[reg_num].rm_so != -1) /* We transited through an empty match for an optional subexpression, like (a?)*, and this is not the subexp's first match. Copy back the old content of the registers so that matches of an inner subexpression are undone as well, like in ((a?))*. */ memcpy (pmatch, prev_idx_match, sizeof (regmatch_t) * nmatch); else /* We completed a subexpression, but it may be part of an optional one, so do not update PREV_IDX_MATCH. */ pmatch[reg_num].rm_eo = cur_idx; } } } } /* This function checks the STATE_LOG from the SCTX->last_str_idx to 0 and sift the nodes in each states according to the following rules. Updated state_log will be wrote to STATE_LOG. Rules: We throw away the Node `a' in the STATE_LOG[STR_IDX] if... 1. When STR_IDX == MATCH_LAST(the last index in the state_log): If `a' isn't the LAST_NODE and `a' can't epsilon transit to the LAST_NODE, we throw away the node `a'. 2. When 0 <= STR_IDX < MATCH_LAST and `a' accepts string `s' and transit to `b': i. If 'b' isn't in the STATE_LOG[STR_IDX+strlen('s')], we throw away the node `a'. ii. If 'b' is in the STATE_LOG[STR_IDX+strlen('s')] but 'b' is thrown away, we throw away the node `a'. 3. When 0 <= STR_IDX < MATCH_LAST and 'a' epsilon transit to 'b': i. If 'b' isn't in the STATE_LOG[STR_IDX], we throw away the node `a'. ii. If 'b' is in the STATE_LOG[STR_IDX] but 'b' is thrown away, we throw away the node `a'. */ #define STATE_NODE_CONTAINS(state,node) \ ((state) != NULL && re_node_set_contains (&(state)->nodes, node)) static reg_errcode_t internal_function sift_states_backward (const re_match_context_t *mctx, re_sift_context_t *sctx) { reg_errcode_t err; int null_cnt = 0; int str_idx = sctx->last_str_idx; re_node_set cur_dest; #ifdef DEBUG assert (mctx->state_log != NULL && mctx->state_log[str_idx] != NULL); #endif /* Build sifted state_log[str_idx]. It has the nodes which can epsilon transit to the last_node and the last_node itself. */ err = re_node_set_init_1 (&cur_dest, sctx->last_node); if (BE (err != REG_NOERROR, 0)) return err; err = update_cur_sifted_state (mctx, sctx, str_idx, &cur_dest); if (BE (err != REG_NOERROR, 0)) goto free_return; /* Then check each states in the state_log. */ while (str_idx > 0) { /* Update counters. */ null_cnt = (sctx->sifted_states[str_idx] == NULL) ? null_cnt + 1 : 0; if (null_cnt > mctx->max_mb_elem_len) { memset (sctx->sifted_states, '\0', sizeof (re_dfastate_t *) * str_idx); re_node_set_free (&cur_dest); return REG_NOERROR; } re_node_set_empty (&cur_dest); --str_idx; if (mctx->state_log[str_idx]) { err = build_sifted_states (mctx, sctx, str_idx, &cur_dest); if (BE (err != REG_NOERROR, 0)) goto free_return; } /* Add all the nodes which satisfy the following conditions: - It can epsilon transit to a node in CUR_DEST. - It is in CUR_SRC. And update state_log. */ err = update_cur_sifted_state (mctx, sctx, str_idx, &cur_dest); if (BE (err != REG_NOERROR, 0)) goto free_return; } err = REG_NOERROR; free_return: re_node_set_free (&cur_dest); return err; } static reg_errcode_t internal_function __attribute_warn_unused_result__ build_sifted_states (const re_match_context_t *mctx, re_sift_context_t *sctx, int str_idx, re_node_set *cur_dest) { const re_dfa_t *const dfa = mctx->dfa; const re_node_set *cur_src = &mctx->state_log[str_idx]->non_eps_nodes; int i; /* Then build the next sifted state. We build the next sifted state on `cur_dest', and update `sifted_states[str_idx]' with `cur_dest'. Note: `cur_dest' is the sifted state from `state_log[str_idx + 1]'. `cur_src' points the node_set of the old `state_log[str_idx]' (with the epsilon nodes pre-filtered out). */ for (i = 0; i < cur_src->nelem; i++) { int prev_node = cur_src->elems[i]; int naccepted = 0; int ret; #ifdef DEBUG re_token_type_t type = dfa->nodes[prev_node].type; assert (!IS_EPSILON_NODE (type)); #endif #ifdef RE_ENABLE_I18N /* If the node may accept `multi byte'. */ if (dfa->nodes[prev_node].accept_mb) naccepted = sift_states_iter_mb (mctx, sctx, prev_node, str_idx, sctx->last_str_idx); #endif /* RE_ENABLE_I18N */ /* We don't check backreferences here. See update_cur_sifted_state(). */ if (!naccepted && check_node_accept (mctx, dfa->nodes + prev_node, str_idx) && STATE_NODE_CONTAINS (sctx->sifted_states[str_idx + 1], dfa->nexts[prev_node])) naccepted = 1; if (naccepted == 0) continue; if (sctx->limits.nelem) { int to_idx = str_idx + naccepted; if (check_dst_limits (mctx, &sctx->limits, dfa->nexts[prev_node], to_idx, prev_node, str_idx)) continue; } ret = re_node_set_insert (cur_dest, prev_node); if (BE (ret == -1, 0)) return REG_ESPACE; } return REG_NOERROR; } /* Helper functions. */ static reg_errcode_t internal_function clean_state_log_if_needed (re_match_context_t *mctx, int next_state_log_idx) { int top = mctx->state_log_top; if ((next_state_log_idx >= mctx->input.bufs_len && mctx->input.bufs_len < mctx->input.len) || (next_state_log_idx >= mctx->input.valid_len && mctx->input.valid_len < mctx->input.len)) { reg_errcode_t err; err = extend_buffers (mctx, next_state_log_idx + 1); if (BE (err != REG_NOERROR, 0)) return err; } if (top < next_state_log_idx) { memset (mctx->state_log + top + 1, '\0', sizeof (re_dfastate_t *) * (next_state_log_idx - top)); mctx->state_log_top = next_state_log_idx; } return REG_NOERROR; } static reg_errcode_t internal_function merge_state_array (const re_dfa_t *dfa, re_dfastate_t **dst, re_dfastate_t **src, int num) { int st_idx; reg_errcode_t err; for (st_idx = 0; st_idx < num; ++st_idx) { if (dst[st_idx] == NULL) dst[st_idx] = src[st_idx]; else if (src[st_idx] != NULL) { re_node_set merged_set; err = re_node_set_init_union (&merged_set, &dst[st_idx]->nodes, &src[st_idx]->nodes); if (BE (err != REG_NOERROR, 0)) return err; dst[st_idx] = re_acquire_state (&err, dfa, &merged_set); re_node_set_free (&merged_set); if (BE (err != REG_NOERROR, 0)) return err; } } return REG_NOERROR; } static reg_errcode_t internal_function update_cur_sifted_state (const re_match_context_t *mctx, re_sift_context_t *sctx, int str_idx, re_node_set *dest_nodes) { const re_dfa_t *const dfa = mctx->dfa; reg_errcode_t err = REG_NOERROR; const re_node_set *candidates; candidates = ((mctx->state_log[str_idx] == NULL) ? NULL : &mctx->state_log[str_idx]->nodes); if (dest_nodes->nelem == 0) sctx->sifted_states[str_idx] = NULL; else { if (candidates) { /* At first, add the nodes which can epsilon transit to a node in DEST_NODE. */ err = add_epsilon_src_nodes (dfa, dest_nodes, candidates); if (BE (err != REG_NOERROR, 0)) return err; /* Then, check the limitations in the current sift_context. */ if (sctx->limits.nelem) { err = check_subexp_limits (dfa, dest_nodes, candidates, &sctx->limits, mctx->bkref_ents, str_idx); if (BE (err != REG_NOERROR, 0)) return err; } } sctx->sifted_states[str_idx] = re_acquire_state (&err, dfa, dest_nodes); if (BE (err != REG_NOERROR, 0)) return err; } if (candidates && mctx->state_log[str_idx]->has_backref) { err = sift_states_bkref (mctx, sctx, str_idx, candidates); if (BE (err != REG_NOERROR, 0)) return err; } return REG_NOERROR; } static reg_errcode_t internal_function __attribute_warn_unused_result__ add_epsilon_src_nodes (const re_dfa_t *dfa, re_node_set *dest_nodes, const re_node_set *candidates) { reg_errcode_t err = REG_NOERROR; int i; re_dfastate_t *state = re_acquire_state (&err, dfa, dest_nodes); if (BE (err != REG_NOERROR, 0)) return err; if (!state->inveclosure.alloc) { err = re_node_set_alloc (&state->inveclosure, dest_nodes->nelem); if (BE (err != REG_NOERROR, 0)) return REG_ESPACE; for (i = 0; i < dest_nodes->nelem; i++) { err = re_node_set_merge (&state->inveclosure, dfa->inveclosures + dest_nodes->elems[i]); if (BE (err != REG_NOERROR, 0)) return REG_ESPACE; } } return re_node_set_add_intersect (dest_nodes, candidates, &state->inveclosure); } static reg_errcode_t internal_function sub_epsilon_src_nodes (const re_dfa_t *dfa, int node, re_node_set *dest_nodes, const re_node_set *candidates) { int ecl_idx; reg_errcode_t err; re_node_set *inv_eclosure = dfa->inveclosures + node; re_node_set except_nodes; re_node_set_init_empty (&except_nodes); for (ecl_idx = 0; ecl_idx < inv_eclosure->nelem; ++ecl_idx) { int cur_node = inv_eclosure->elems[ecl_idx]; if (cur_node == node) continue; if (IS_EPSILON_NODE (dfa->nodes[cur_node].type)) { int edst1 = dfa->edests[cur_node].elems[0]; int edst2 = ((dfa->edests[cur_node].nelem > 1) ? dfa->edests[cur_node].elems[1] : -1); if ((!re_node_set_contains (inv_eclosure, edst1) && re_node_set_contains (dest_nodes, edst1)) || (edst2 > 0 && !re_node_set_contains (inv_eclosure, edst2) && re_node_set_contains (dest_nodes, edst2))) { err = re_node_set_add_intersect (&except_nodes, candidates, dfa->inveclosures + cur_node); if (BE (err != REG_NOERROR, 0)) { re_node_set_free (&except_nodes); return err; } } } } for (ecl_idx = 0; ecl_idx < inv_eclosure->nelem; ++ecl_idx) { int cur_node = inv_eclosure->elems[ecl_idx]; if (!re_node_set_contains (&except_nodes, cur_node)) { int idx = re_node_set_contains (dest_nodes, cur_node) - 1; re_node_set_remove_at (dest_nodes, idx); } } re_node_set_free (&except_nodes); return REG_NOERROR; } static int internal_function check_dst_limits (const re_match_context_t *mctx, re_node_set *limits, int dst_node, int dst_idx, int src_node, int src_idx) { const re_dfa_t *const dfa = mctx->dfa; int lim_idx, src_pos, dst_pos; int dst_bkref_idx = search_cur_bkref_entry (mctx, dst_idx); int src_bkref_idx = search_cur_bkref_entry (mctx, src_idx); for (lim_idx = 0; lim_idx < limits->nelem; ++lim_idx) { int subexp_idx; struct re_backref_cache_entry *ent; ent = mctx->bkref_ents + limits->elems[lim_idx]; subexp_idx = dfa->nodes[ent->node].opr.idx; dst_pos = check_dst_limits_calc_pos (mctx, limits->elems[lim_idx], subexp_idx, dst_node, dst_idx, dst_bkref_idx); src_pos = check_dst_limits_calc_pos (mctx, limits->elems[lim_idx], subexp_idx, src_node, src_idx, src_bkref_idx); /* In case of: ( ) ( ) ( ) */ if (src_pos == dst_pos) continue; /* This is unrelated limitation. */ else return 1; } return 0; } static int internal_function check_dst_limits_calc_pos_1 (const re_match_context_t *mctx, int boundaries, int subexp_idx, int from_node, int bkref_idx) { const re_dfa_t *const dfa = mctx->dfa; const re_node_set *eclosures = dfa->eclosures + from_node; int node_idx; /* Else, we are on the boundary: examine the nodes on the epsilon closure. */ for (node_idx = 0; node_idx < eclosures->nelem; ++node_idx) { int node = eclosures->elems[node_idx]; switch (dfa->nodes[node].type) { case OP_BACK_REF: if (bkref_idx != -1) { struct re_backref_cache_entry *ent = mctx->bkref_ents + bkref_idx; do { int dst, cpos; if (ent->node != node) continue; if (subexp_idx < BITSET_WORD_BITS && !(ent->eps_reachable_subexps_map & ((bitset_word_t) 1 << subexp_idx))) continue; /* Recurse trying to reach the OP_OPEN_SUBEXP and OP_CLOSE_SUBEXP cases below. But, if the destination node is the same node as the source node, don't recurse because it would cause an infinite loop: a regex that exhibits this behavior is ()\1*\1* */ dst = dfa->edests[node].elems[0]; if (dst == from_node) { if (boundaries & 1) return -1; else /* if (boundaries & 2) */ return 0; } cpos = check_dst_limits_calc_pos_1 (mctx, boundaries, subexp_idx, dst, bkref_idx); if (cpos == -1 /* && (boundaries & 1) */) return -1; if (cpos == 0 && (boundaries & 2)) return 0; if (subexp_idx < BITSET_WORD_BITS) ent->eps_reachable_subexps_map &= ~((bitset_word_t) 1 << subexp_idx); } while (ent++->more); } break; case OP_OPEN_SUBEXP: if ((boundaries & 1) && subexp_idx == dfa->nodes[node].opr.idx) return -1; break; case OP_CLOSE_SUBEXP: if ((boundaries & 2) && subexp_idx == dfa->nodes[node].opr.idx) return 0; break; default: break; } } return (boundaries & 2) ? 1 : 0; } static int internal_function check_dst_limits_calc_pos (const re_match_context_t *mctx, int limit, int subexp_idx, int from_node, int str_idx, int bkref_idx) { struct re_backref_cache_entry *lim = mctx->bkref_ents + limit; int boundaries; /* If we are outside the range of the subexpression, return -1 or 1. */ if (str_idx < lim->subexp_from) return -1; if (lim->subexp_to < str_idx) return 1; /* If we are within the subexpression, return 0. */ boundaries = (str_idx == lim->subexp_from); boundaries |= (str_idx == lim->subexp_to) << 1; if (boundaries == 0) return 0; /* Else, examine epsilon closure. */ return check_dst_limits_calc_pos_1 (mctx, boundaries, subexp_idx, from_node, bkref_idx); } /* Check the limitations of sub expressions LIMITS, and remove the nodes which are against limitations from DEST_NODES. */ static reg_errcode_t internal_function check_subexp_limits (const re_dfa_t *dfa, re_node_set *dest_nodes, const re_node_set *candidates, re_node_set *limits, struct re_backref_cache_entry *bkref_ents, int str_idx) { reg_errcode_t err; int node_idx, lim_idx; for (lim_idx = 0; lim_idx < limits->nelem; ++lim_idx) { int subexp_idx; struct re_backref_cache_entry *ent; ent = bkref_ents + limits->elems[lim_idx]; if (str_idx <= ent->subexp_from || ent->str_idx < str_idx) continue; /* This is unrelated limitation. */ subexp_idx = dfa->nodes[ent->node].opr.idx; if (ent->subexp_to == str_idx) { int ops_node = -1; int cls_node = -1; for (node_idx = 0; node_idx < dest_nodes->nelem; ++node_idx) { int node = dest_nodes->elems[node_idx]; re_token_type_t type = dfa->nodes[node].type; if (type == OP_OPEN_SUBEXP && subexp_idx == dfa->nodes[node].opr.idx) ops_node = node; else if (type == OP_CLOSE_SUBEXP && subexp_idx == dfa->nodes[node].opr.idx) cls_node = node; } /* Check the limitation of the open subexpression. */ /* Note that (ent->subexp_to = str_idx != ent->subexp_from). */ if (ops_node >= 0) { err = sub_epsilon_src_nodes (dfa, ops_node, dest_nodes, candidates); if (BE (err != REG_NOERROR, 0)) return err; } /* Check the limitation of the close subexpression. */ if (cls_node >= 0) for (node_idx = 0; node_idx < dest_nodes->nelem; ++node_idx) { int node = dest_nodes->elems[node_idx]; if (!re_node_set_contains (dfa->inveclosures + node, cls_node) && !re_node_set_contains (dfa->eclosures + node, cls_node)) { /* It is against this limitation. Remove it form the current sifted state. */ err = sub_epsilon_src_nodes (dfa, node, dest_nodes, candidates); if (BE (err != REG_NOERROR, 0)) return err; --node_idx; } } } else /* (ent->subexp_to != str_idx) */ { for (node_idx = 0; node_idx < dest_nodes->nelem; ++node_idx) { int node = dest_nodes->elems[node_idx]; re_token_type_t type = dfa->nodes[node].type; if (type == OP_CLOSE_SUBEXP || type == OP_OPEN_SUBEXP) { if (subexp_idx != dfa->nodes[node].opr.idx) continue; /* It is against this limitation. Remove it form the current sifted state. */ err = sub_epsilon_src_nodes (dfa, node, dest_nodes, candidates); if (BE (err != REG_NOERROR, 0)) return err; } } } } return REG_NOERROR; } static reg_errcode_t internal_function __attribute_warn_unused_result__ sift_states_bkref (const re_match_context_t *mctx, re_sift_context_t *sctx, int str_idx, const re_node_set *candidates) { const re_dfa_t *const dfa = mctx->dfa; reg_errcode_t err; int node_idx, node; re_sift_context_t local_sctx; int first_idx = search_cur_bkref_entry (mctx, str_idx); if (first_idx == -1) return REG_NOERROR; local_sctx.sifted_states = NULL; /* Mark that it hasn't been initialized. */ for (node_idx = 0; node_idx < candidates->nelem; ++node_idx) { int enabled_idx; re_token_type_t type; struct re_backref_cache_entry *entry; node = candidates->elems[node_idx]; type = dfa->nodes[node].type; /* Avoid infinite loop for the REs like "()\1+". */ if (node == sctx->last_node && str_idx == sctx->last_str_idx) continue; if (type != OP_BACK_REF) continue; entry = mctx->bkref_ents + first_idx; enabled_idx = first_idx; do { int subexp_len; int to_idx; int dst_node; int ret; re_dfastate_t *cur_state; if (entry->node != node) continue; subexp_len = entry->subexp_to - entry->subexp_from; to_idx = str_idx + subexp_len; dst_node = (subexp_len ? dfa->nexts[node] : dfa->edests[node].elems[0]); if (to_idx > sctx->last_str_idx || sctx->sifted_states[to_idx] == NULL || !STATE_NODE_CONTAINS (sctx->sifted_states[to_idx], dst_node) || check_dst_limits (mctx, &sctx->limits, node, str_idx, dst_node, to_idx)) continue; if (local_sctx.sifted_states == NULL) { local_sctx = *sctx; err = re_node_set_init_copy (&local_sctx.limits, &sctx->limits); if (BE (err != REG_NOERROR, 0)) goto free_return; } local_sctx.last_node = node; local_sctx.last_str_idx = str_idx; ret = re_node_set_insert (&local_sctx.limits, enabled_idx); if (BE (ret < 0, 0)) { err = REG_ESPACE; goto free_return; } cur_state = local_sctx.sifted_states[str_idx]; err = sift_states_backward (mctx, &local_sctx); if (BE (err != REG_NOERROR, 0)) goto free_return; if (sctx->limited_states != NULL) { err = merge_state_array (dfa, sctx->limited_states, local_sctx.sifted_states, str_idx + 1); if (BE (err != REG_NOERROR, 0)) goto free_return; } local_sctx.sifted_states[str_idx] = cur_state; re_node_set_remove (&local_sctx.limits, enabled_idx); /* mctx->bkref_ents may have changed, reload the pointer. */ entry = mctx->bkref_ents + enabled_idx; } while (enabled_idx++, entry++->more); } err = REG_NOERROR; free_return: if (local_sctx.sifted_states != NULL) { re_node_set_free (&local_sctx.limits); } return err; } #ifdef RE_ENABLE_I18N static int internal_function sift_states_iter_mb (const re_match_context_t *mctx, re_sift_context_t *sctx, int node_idx, int str_idx, int max_str_idx) { const re_dfa_t *const dfa = mctx->dfa; int naccepted; /* Check the node can accept `multi byte'. */ naccepted = check_node_accept_bytes (dfa, node_idx, &mctx->input, str_idx); if (naccepted > 0 && str_idx + naccepted <= max_str_idx && !STATE_NODE_CONTAINS (sctx->sifted_states[str_idx + naccepted], dfa->nexts[node_idx])) /* The node can't accept the `multi byte', or the destination was already thrown away, then the node could't accept the current input `multi byte'. */ naccepted = 0; /* Otherwise, it is sure that the node could accept `naccepted' bytes input. */ return naccepted; } #endif /* RE_ENABLE_I18N */ /* Functions for state transition. */ /* Return the next state to which the current state STATE will transit by accepting the current input byte, and update STATE_LOG if necessary. If STATE can accept a multibyte char/collating element/back reference update the destination of STATE_LOG. */ static re_dfastate_t * internal_function __attribute_warn_unused_result__ transit_state (reg_errcode_t *err, re_match_context_t *mctx, re_dfastate_t *state) { re_dfastate_t **trtable; unsigned char ch; #ifdef RE_ENABLE_I18N /* If the current state can accept multibyte. */ if (BE (state->accept_mb, 0)) { *err = transit_state_mb (mctx, state); if (BE (*err != REG_NOERROR, 0)) return NULL; } #endif /* RE_ENABLE_I18N */ /* Then decide the next state with the single byte. */ #if 0 if (0) /* don't use transition table */ return transit_state_sb (err, mctx, state); #endif /* Use transition table */ ch = re_string_fetch_byte (&mctx->input); for (;;) { trtable = state->trtable; if (BE (trtable != NULL, 1)) return trtable[ch]; trtable = state->word_trtable; if (BE (trtable != NULL, 1)) { unsigned int context; context = re_string_context_at (&mctx->input, re_string_cur_idx (&mctx->input) - 1, mctx->eflags); if (IS_WORD_CONTEXT (context)) return trtable[ch + SBC_MAX]; else return trtable[ch]; } if (!build_trtable (mctx->dfa, state)) { *err = REG_ESPACE; return NULL; } /* Retry, we now have a transition table. */ } } /* Update the state_log if we need */ re_dfastate_t * internal_function merge_state_with_log (reg_errcode_t *err, re_match_context_t *mctx, re_dfastate_t *next_state) { const re_dfa_t *const dfa = mctx->dfa; int cur_idx = re_string_cur_idx (&mctx->input); if (cur_idx > mctx->state_log_top) { mctx->state_log[cur_idx] = next_state; mctx->state_log_top = cur_idx; } else if (mctx->state_log[cur_idx] == 0) { mctx->state_log[cur_idx] = next_state; } else { re_dfastate_t *pstate; unsigned int context; re_node_set next_nodes, *log_nodes, *table_nodes = NULL; /* If (state_log[cur_idx] != 0), it implies that cur_idx is the destination of a multibyte char/collating element/ back reference. Then the next state is the union set of these destinations and the results of the transition table. */ pstate = mctx->state_log[cur_idx]; log_nodes = pstate->entrance_nodes; if (next_state != NULL) { table_nodes = next_state->entrance_nodes; *err = re_node_set_init_union (&next_nodes, table_nodes, log_nodes); if (BE (*err != REG_NOERROR, 0)) return NULL; } else next_nodes = *log_nodes; /* Note: We already add the nodes of the initial state, then we don't need to add them here. */ context = re_string_context_at (&mctx->input, re_string_cur_idx (&mctx->input) - 1, mctx->eflags); next_state = mctx->state_log[cur_idx] = re_acquire_state_context (err, dfa, &next_nodes, context); /* We don't need to check errors here, since the return value of this function is next_state and ERR is already set. */ if (table_nodes != NULL) re_node_set_free (&next_nodes); } if (BE (dfa->nbackref, 0) && next_state != NULL) { /* Check OP_OPEN_SUBEXP in the current state in case that we use them later. We must check them here, since the back references in the next state might use them. */ *err = check_subexp_matching_top (mctx, &next_state->nodes, cur_idx); if (BE (*err != REG_NOERROR, 0)) return NULL; /* If the next state has back references. */ if (next_state->has_backref) { *err = transit_state_bkref (mctx, &next_state->nodes); if (BE (*err != REG_NOERROR, 0)) return NULL; next_state = mctx->state_log[cur_idx]; } } return next_state; } /* Skip bytes in the input that correspond to part of a multi-byte match, then look in the log for a state from which to restart matching. */ re_dfastate_t * internal_function find_recover_state (reg_errcode_t *err, re_match_context_t *mctx) { re_dfastate_t *cur_state; do { int max = mctx->state_log_top; int cur_str_idx = re_string_cur_idx (&mctx->input); do { if (++cur_str_idx > max) return NULL; re_string_skip_bytes (&mctx->input, 1); } while (mctx->state_log[cur_str_idx] == NULL); cur_state = merge_state_with_log (err, mctx, NULL); } while (*err == REG_NOERROR && cur_state == NULL); return cur_state; } /* Helper functions for transit_state. */ /* From the node set CUR_NODES, pick up the nodes whose types are OP_OPEN_SUBEXP and which have corresponding back references in the regular expression. And register them to use them later for evaluating the correspoding back references. */ static reg_errcode_t internal_function check_subexp_matching_top (re_match_context_t *mctx, re_node_set *cur_nodes, int str_idx) { const re_dfa_t *const dfa = mctx->dfa; int node_idx; reg_errcode_t err; /* TODO: This isn't efficient. Because there might be more than one nodes whose types are OP_OPEN_SUBEXP and whose index is SUBEXP_IDX, we must check all nodes. E.g. RE: (a){2} */ for (node_idx = 0; node_idx < cur_nodes->nelem; ++node_idx) { int node = cur_nodes->elems[node_idx]; if (dfa->nodes[node].type == OP_OPEN_SUBEXP && dfa->nodes[node].opr.idx < BITSET_WORD_BITS && (dfa->used_bkref_map & ((bitset_word_t) 1 << dfa->nodes[node].opr.idx))) { err = match_ctx_add_subtop (mctx, node, str_idx); if (BE (err != REG_NOERROR, 0)) return err; } } return REG_NOERROR; } #if 0 /* Return the next state to which the current state STATE will transit by accepting the current input byte. */ static re_dfastate_t * transit_state_sb (reg_errcode_t *err, re_match_context_t *mctx, re_dfastate_t *state) { const re_dfa_t *const dfa = mctx->dfa; re_node_set next_nodes; re_dfastate_t *next_state; int node_cnt, cur_str_idx = re_string_cur_idx (&mctx->input); unsigned int context; *err = re_node_set_alloc (&next_nodes, state->nodes.nelem + 1); if (BE (*err != REG_NOERROR, 0)) return NULL; for (node_cnt = 0; node_cnt < state->nodes.nelem; ++node_cnt) { int cur_node = state->nodes.elems[node_cnt]; if (check_node_accept (mctx, dfa->nodes + cur_node, cur_str_idx)) { *err = re_node_set_merge (&next_nodes, dfa->eclosures + dfa->nexts[cur_node]); if (BE (*err != REG_NOERROR, 0)) { re_node_set_free (&next_nodes); return NULL; } } } context = re_string_context_at (&mctx->input, cur_str_idx, mctx->eflags); next_state = re_acquire_state_context (err, dfa, &next_nodes, context); /* We don't need to check errors here, since the return value of this function is next_state and ERR is already set. */ re_node_set_free (&next_nodes); re_string_skip_bytes (&mctx->input, 1); return next_state; } #endif #ifdef RE_ENABLE_I18N static reg_errcode_t internal_function transit_state_mb (re_match_context_t *mctx, re_dfastate_t *pstate) { const re_dfa_t *const dfa = mctx->dfa; reg_errcode_t err; int i; for (i = 0; i < pstate->nodes.nelem; ++i) { re_node_set dest_nodes, *new_nodes; int cur_node_idx = pstate->nodes.elems[i]; int naccepted, dest_idx; unsigned int context; re_dfastate_t *dest_state; if (!dfa->nodes[cur_node_idx].accept_mb) continue; if (dfa->nodes[cur_node_idx].constraint) { context = re_string_context_at (&mctx->input, re_string_cur_idx (&mctx->input), mctx->eflags); if (NOT_SATISFY_NEXT_CONSTRAINT (dfa->nodes[cur_node_idx].constraint, context)) continue; } /* How many bytes the node can accept? */ naccepted = check_node_accept_bytes (dfa, cur_node_idx, &mctx->input, re_string_cur_idx (&mctx->input)); if (naccepted == 0) continue; /* The node can accepts `naccepted' bytes. */ dest_idx = re_string_cur_idx (&mctx->input) + naccepted; mctx->max_mb_elem_len = ((mctx->max_mb_elem_len < naccepted) ? naccepted : mctx->max_mb_elem_len); err = clean_state_log_if_needed (mctx, dest_idx); if (BE (err != REG_NOERROR, 0)) return err; #ifdef DEBUG assert (dfa->nexts[cur_node_idx] != -1); #endif new_nodes = dfa->eclosures + dfa->nexts[cur_node_idx]; dest_state = mctx->state_log[dest_idx]; if (dest_state == NULL) dest_nodes = *new_nodes; else { err = re_node_set_init_union (&dest_nodes, dest_state->entrance_nodes, new_nodes); if (BE (err != REG_NOERROR, 0)) return err; } context = re_string_context_at (&mctx->input, dest_idx - 1, mctx->eflags); mctx->state_log[dest_idx] = re_acquire_state_context (&err, dfa, &dest_nodes, context); if (dest_state != NULL) re_node_set_free (&dest_nodes); if (BE (mctx->state_log[dest_idx] == NULL && err != REG_NOERROR, 0)) return err; } return REG_NOERROR; } #endif /* RE_ENABLE_I18N */ static reg_errcode_t internal_function transit_state_bkref (re_match_context_t *mctx, const re_node_set *nodes) { const re_dfa_t *const dfa = mctx->dfa; reg_errcode_t err; int i; int cur_str_idx = re_string_cur_idx (&mctx->input); for (i = 0; i < nodes->nelem; ++i) { int dest_str_idx, prev_nelem, bkc_idx; int node_idx = nodes->elems[i]; unsigned int context; const re_token_t *node = dfa->nodes + node_idx; re_node_set *new_dest_nodes; /* Check whether `node' is a backreference or not. */ if (node->type != OP_BACK_REF) continue; if (node->constraint) { context = re_string_context_at (&mctx->input, cur_str_idx, mctx->eflags); if (NOT_SATISFY_NEXT_CONSTRAINT (node->constraint, context)) continue; } /* `node' is a backreference. Check the substring which the substring matched. */ bkc_idx = mctx->nbkref_ents; err = get_subexp (mctx, node_idx, cur_str_idx); if (BE (err != REG_NOERROR, 0)) goto free_return; /* And add the epsilon closures (which is `new_dest_nodes') of the backreference to appropriate state_log. */ #ifdef DEBUG assert (dfa->nexts[node_idx] != -1); #endif for (; bkc_idx < mctx->nbkref_ents; ++bkc_idx) { int subexp_len; re_dfastate_t *dest_state; struct re_backref_cache_entry *bkref_ent; bkref_ent = mctx->bkref_ents + bkc_idx; if (bkref_ent->node != node_idx || bkref_ent->str_idx != cur_str_idx) continue; subexp_len = bkref_ent->subexp_to - bkref_ent->subexp_from; new_dest_nodes = (subexp_len == 0 ? dfa->eclosures + dfa->edests[node_idx].elems[0] : dfa->eclosures + dfa->nexts[node_idx]); dest_str_idx = (cur_str_idx + bkref_ent->subexp_to - bkref_ent->subexp_from); context = re_string_context_at (&mctx->input, dest_str_idx - 1, mctx->eflags); dest_state = mctx->state_log[dest_str_idx]; prev_nelem = ((mctx->state_log[cur_str_idx] == NULL) ? 0 : mctx->state_log[cur_str_idx]->nodes.nelem); /* Add `new_dest_node' to state_log. */ if (dest_state == NULL) { mctx->state_log[dest_str_idx] = re_acquire_state_context (&err, dfa, new_dest_nodes, context); if (BE (mctx->state_log[dest_str_idx] == NULL && err != REG_NOERROR, 0)) goto free_return; } else { re_node_set dest_nodes; err = re_node_set_init_union (&dest_nodes, dest_state->entrance_nodes, new_dest_nodes); if (BE (err != REG_NOERROR, 0)) { re_node_set_free (&dest_nodes); goto free_return; } mctx->state_log[dest_str_idx] = re_acquire_state_context (&err, dfa, &dest_nodes, context); re_node_set_free (&dest_nodes); if (BE (mctx->state_log[dest_str_idx] == NULL && err != REG_NOERROR, 0)) goto free_return; } /* We need to check recursively if the backreference can epsilon transit. */ if (subexp_len == 0 && mctx->state_log[cur_str_idx]->nodes.nelem > prev_nelem) { err = check_subexp_matching_top (mctx, new_dest_nodes, cur_str_idx); if (BE (err != REG_NOERROR, 0)) goto free_return; err = transit_state_bkref (mctx, new_dest_nodes); if (BE (err != REG_NOERROR, 0)) goto free_return; } } } err = REG_NOERROR; free_return: return err; } /* Enumerate all the candidates which the backreference BKREF_NODE can match at BKREF_STR_IDX, and register them by match_ctx_add_entry(). Note that we might collect inappropriate candidates here. However, the cost of checking them strictly here is too high, then we delay these checking for prune_impossible_nodes(). */ static reg_errcode_t internal_function __attribute_warn_unused_result__ get_subexp (re_match_context_t *mctx, int bkref_node, int bkref_str_idx) { const re_dfa_t *const dfa = mctx->dfa; int subexp_num, sub_top_idx; const char *buf = (const char *) re_string_get_buffer (&mctx->input); /* Return if we have already checked BKREF_NODE at BKREF_STR_IDX. */ int cache_idx = search_cur_bkref_entry (mctx, bkref_str_idx); if (cache_idx != -1) { const struct re_backref_cache_entry *entry = mctx->bkref_ents + cache_idx; do if (entry->node == bkref_node) return REG_NOERROR; /* We already checked it. */ while (entry++->more); } subexp_num = dfa->nodes[bkref_node].opr.idx; /* For each sub expression */ for (sub_top_idx = 0; sub_top_idx < mctx->nsub_tops; ++sub_top_idx) { reg_errcode_t err; re_sub_match_top_t *sub_top = mctx->sub_tops[sub_top_idx]; re_sub_match_last_t *sub_last; int sub_last_idx, sl_str, bkref_str_off; if (dfa->nodes[sub_top->node].opr.idx != subexp_num) continue; /* It isn't related. */ sl_str = sub_top->str_idx; bkref_str_off = bkref_str_idx; /* At first, check the last node of sub expressions we already evaluated. */ for (sub_last_idx = 0; sub_last_idx < sub_top->nlasts; ++sub_last_idx) { int sl_str_diff; sub_last = sub_top->lasts[sub_last_idx]; sl_str_diff = sub_last->str_idx - sl_str; /* The matched string by the sub expression match with the substring at the back reference? */ if (sl_str_diff > 0) { if (BE (bkref_str_off + sl_str_diff > mctx->input.valid_len, 0)) { /* Not enough chars for a successful match. */ if (bkref_str_off + sl_str_diff > mctx->input.len) break; err = clean_state_log_if_needed (mctx, bkref_str_off + sl_str_diff); if (BE (err != REG_NOERROR, 0)) return err; buf = (const char *) re_string_get_buffer (&mctx->input); } if (memcmp (buf + bkref_str_off, buf + sl_str, sl_str_diff) != 0) /* We don't need to search this sub expression any more. */ break; } bkref_str_off += sl_str_diff; sl_str += sl_str_diff; err = get_subexp_sub (mctx, sub_top, sub_last, bkref_node, bkref_str_idx); /* Reload buf, since the preceding call might have reallocated the buffer. */ buf = (const char *) re_string_get_buffer (&mctx->input); if (err == REG_NOMATCH) continue; if (BE (err != REG_NOERROR, 0)) return err; } if (sub_last_idx < sub_top->nlasts) continue; if (sub_last_idx > 0) ++sl_str; /* Then, search for the other last nodes of the sub expression. */ for (; sl_str <= bkref_str_idx; ++sl_str) { int cls_node, sl_str_off; const re_node_set *nodes; sl_str_off = sl_str - sub_top->str_idx; /* The matched string by the sub expression match with the substring at the back reference? */ if (sl_str_off > 0) { if (BE (bkref_str_off >= mctx->input.valid_len, 0)) { /* If we are at the end of the input, we cannot match. */ if (bkref_str_off >= mctx->input.len) break; err = extend_buffers (mctx, bkref_str_off + 1); if (BE (err != REG_NOERROR, 0)) return err; buf = (const char *) re_string_get_buffer (&mctx->input); } if (buf [bkref_str_off++] != buf[sl_str - 1]) break; /* We don't need to search this sub expression any more. */ } if (mctx->state_log[sl_str] == NULL) continue; /* Does this state have a ')' of the sub expression? */ nodes = &mctx->state_log[sl_str]->nodes; cls_node = find_subexp_node (dfa, nodes, subexp_num, OP_CLOSE_SUBEXP); if (cls_node == -1) continue; /* No. */ if (sub_top->path == NULL) { sub_top->path = calloc (sizeof (state_array_t), sl_str - sub_top->str_idx + 1); if (sub_top->path == NULL) return REG_ESPACE; } /* Can the OP_OPEN_SUBEXP node arrive the OP_CLOSE_SUBEXP node in the current context? */ err = check_arrival (mctx, sub_top->path, sub_top->node, sub_top->str_idx, cls_node, sl_str, OP_CLOSE_SUBEXP); if (err == REG_NOMATCH) continue; if (BE (err != REG_NOERROR, 0)) return err; sub_last = match_ctx_add_sublast (sub_top, cls_node, sl_str); if (BE (sub_last == NULL, 0)) return REG_ESPACE; err = get_subexp_sub (mctx, sub_top, sub_last, bkref_node, bkref_str_idx); if (err == REG_NOMATCH) continue; } } return REG_NOERROR; } /* Helper functions for get_subexp(). */ /* Check SUB_LAST can arrive to the back reference BKREF_NODE at BKREF_STR. If it can arrive, register the sub expression expressed with SUB_TOP and SUB_LAST. */ static reg_errcode_t internal_function get_subexp_sub (re_match_context_t *mctx, const re_sub_match_top_t *sub_top, re_sub_match_last_t *sub_last, int bkref_node, int bkref_str) { reg_errcode_t err; int to_idx; /* Can the subexpression arrive the back reference? */ err = check_arrival (mctx, &sub_last->path, sub_last->node, sub_last->str_idx, bkref_node, bkref_str, OP_OPEN_SUBEXP); if (err != REG_NOERROR) return err; err = match_ctx_add_entry (mctx, bkref_node, bkref_str, sub_top->str_idx, sub_last->str_idx); if (BE (err != REG_NOERROR, 0)) return err; to_idx = bkref_str + sub_last->str_idx - sub_top->str_idx; return clean_state_log_if_needed (mctx, to_idx); } /* Find the first node which is '(' or ')' and whose index is SUBEXP_IDX. Search '(' if FL_OPEN, or search ')' otherwise. TODO: This function isn't efficient... Because there might be more than one nodes whose types are OP_OPEN_SUBEXP and whose index is SUBEXP_IDX, we must check all nodes. E.g. RE: (a){2} */ static int internal_function find_subexp_node (const re_dfa_t *dfa, const re_node_set *nodes, int subexp_idx, int type) { int cls_idx; for (cls_idx = 0; cls_idx < nodes->nelem; ++cls_idx) { int cls_node = nodes->elems[cls_idx]; const re_token_t *node = dfa->nodes + cls_node; if (node->type == type && node->opr.idx == subexp_idx) return cls_node; } return -1; } /* Check whether the node TOP_NODE at TOP_STR can arrive to the node LAST_NODE at LAST_STR. We record the path onto PATH since it will be heavily reused. Return REG_NOERROR if it can arrive, or REG_NOMATCH otherwise. */ static reg_errcode_t internal_function __attribute_warn_unused_result__ check_arrival (re_match_context_t *mctx, state_array_t *path, int top_node, int top_str, int last_node, int last_str, int type) { const re_dfa_t *const dfa = mctx->dfa; reg_errcode_t err = REG_NOERROR; int subexp_num, backup_cur_idx, str_idx, null_cnt; re_dfastate_t *cur_state = NULL; re_node_set *cur_nodes, next_nodes; re_dfastate_t **backup_state_log; unsigned int context; subexp_num = dfa->nodes[top_node].opr.idx; /* Extend the buffer if we need. */ if (BE (path->alloc < last_str + mctx->max_mb_elem_len + 1, 0)) { re_dfastate_t **new_array; int old_alloc = path->alloc; path->alloc += last_str + mctx->max_mb_elem_len + 1; new_array = re_realloc (path->array, re_dfastate_t *, path->alloc); if (BE (new_array == NULL, 0)) { path->alloc = old_alloc; return REG_ESPACE; } path->array = new_array; memset (new_array + old_alloc, '\0', sizeof (re_dfastate_t *) * (path->alloc - old_alloc)); } str_idx = path->next_idx ?: top_str; /* Temporary modify MCTX. */ backup_state_log = mctx->state_log; backup_cur_idx = mctx->input.cur_idx; mctx->state_log = path->array; mctx->input.cur_idx = str_idx; /* Setup initial node set. */ context = re_string_context_at (&mctx->input, str_idx - 1, mctx->eflags); if (str_idx == top_str) { err = re_node_set_init_1 (&next_nodes, top_node); if (BE (err != REG_NOERROR, 0)) return err; err = check_arrival_expand_ecl (dfa, &next_nodes, subexp_num, type); if (BE (err != REG_NOERROR, 0)) { re_node_set_free (&next_nodes); return err; } } else { cur_state = mctx->state_log[str_idx]; if (cur_state && cur_state->has_backref) { err = re_node_set_init_copy (&next_nodes, &cur_state->nodes); if (BE (err != REG_NOERROR, 0)) return err; } else re_node_set_init_empty (&next_nodes); } if (str_idx == top_str || (cur_state && cur_state->has_backref)) { if (next_nodes.nelem) { err = expand_bkref_cache (mctx, &next_nodes, str_idx, subexp_num, type); if (BE (err != REG_NOERROR, 0)) { re_node_set_free (&next_nodes); return err; } } cur_state = re_acquire_state_context (&err, dfa, &next_nodes, context); if (BE (cur_state == NULL && err != REG_NOERROR, 0)) { re_node_set_free (&next_nodes); return err; } mctx->state_log[str_idx] = cur_state; } for (null_cnt = 0; str_idx < last_str && null_cnt <= mctx->max_mb_elem_len;) { re_node_set_empty (&next_nodes); if (mctx->state_log[str_idx + 1]) { err = re_node_set_merge (&next_nodes, &mctx->state_log[str_idx + 1]->nodes); if (BE (err != REG_NOERROR, 0)) { re_node_set_free (&next_nodes); return err; } } if (cur_state) { err = check_arrival_add_next_nodes (mctx, str_idx, &cur_state->non_eps_nodes, &next_nodes); if (BE (err != REG_NOERROR, 0)) { re_node_set_free (&next_nodes); return err; } } ++str_idx; if (next_nodes.nelem) { err = check_arrival_expand_ecl (dfa, &next_nodes, subexp_num, type); if (BE (err != REG_NOERROR, 0)) { re_node_set_free (&next_nodes); return err; } err = expand_bkref_cache (mctx, &next_nodes, str_idx, subexp_num, type); if (BE (err != REG_NOERROR, 0)) { re_node_set_free (&next_nodes); return err; } } context = re_string_context_at (&mctx->input, str_idx - 1, mctx->eflags); cur_state = re_acquire_state_context (&err, dfa, &next_nodes, context); if (BE (cur_state == NULL && err != REG_NOERROR, 0)) { re_node_set_free (&next_nodes); return err; } mctx->state_log[str_idx] = cur_state; null_cnt = cur_state == NULL ? null_cnt + 1 : 0; } re_node_set_free (&next_nodes); cur_nodes = (mctx->state_log[last_str] == NULL ? NULL : &mctx->state_log[last_str]->nodes); path->next_idx = str_idx; /* Fix MCTX. */ mctx->state_log = backup_state_log; mctx->input.cur_idx = backup_cur_idx; /* Then check the current node set has the node LAST_NODE. */ if (cur_nodes != NULL && re_node_set_contains (cur_nodes, last_node)) return REG_NOERROR; return REG_NOMATCH; } /* Helper functions for check_arrival. */ /* Calculate the destination nodes of CUR_NODES at STR_IDX, and append them to NEXT_NODES. TODO: This function is similar to the functions transit_state*(), however this function has many additional works. Can't we unify them? */ static reg_errcode_t internal_function __attribute_warn_unused_result__ check_arrival_add_next_nodes (re_match_context_t *mctx, int str_idx, re_node_set *cur_nodes, re_node_set *next_nodes) { const re_dfa_t *const dfa = mctx->dfa; int result; int cur_idx; reg_errcode_t err = REG_NOERROR; re_node_set union_set; re_node_set_init_empty (&union_set); for (cur_idx = 0; cur_idx < cur_nodes->nelem; ++cur_idx) { int naccepted = 0; int cur_node = cur_nodes->elems[cur_idx]; #ifdef DEBUG re_token_type_t type = dfa->nodes[cur_node].type; assert (!IS_EPSILON_NODE (type)); #endif #ifdef RE_ENABLE_I18N /* If the node may accept `multi byte'. */ if (dfa->nodes[cur_node].accept_mb) { naccepted = check_node_accept_bytes (dfa, cur_node, &mctx->input, str_idx); if (naccepted > 1) { re_dfastate_t *dest_state; int next_node = dfa->nexts[cur_node]; int next_idx = str_idx + naccepted; dest_state = mctx->state_log[next_idx]; re_node_set_empty (&union_set); if (dest_state) { err = re_node_set_merge (&union_set, &dest_state->nodes); if (BE (err != REG_NOERROR, 0)) { re_node_set_free (&union_set); return err; } } result = re_node_set_insert (&union_set, next_node); if (BE (result < 0, 0)) { re_node_set_free (&union_set); return REG_ESPACE; } mctx->state_log[next_idx] = re_acquire_state (&err, dfa, &union_set); if (BE (mctx->state_log[next_idx] == NULL && err != REG_NOERROR, 0)) { re_node_set_free (&union_set); return err; } } } #endif /* RE_ENABLE_I18N */ if (naccepted || check_node_accept (mctx, dfa->nodes + cur_node, str_idx)) { result = re_node_set_insert (next_nodes, dfa->nexts[cur_node]); if (BE (result < 0, 0)) { re_node_set_free (&union_set); return REG_ESPACE; } } } re_node_set_free (&union_set); return REG_NOERROR; } /* For all the nodes in CUR_NODES, add the epsilon closures of them to CUR_NODES, however exclude the nodes which are: - inside the sub expression whose number is EX_SUBEXP, if FL_OPEN. - out of the sub expression whose number is EX_SUBEXP, if !FL_OPEN. */ static reg_errcode_t internal_function check_arrival_expand_ecl (const re_dfa_t *dfa, re_node_set *cur_nodes, int ex_subexp, int type) { reg_errcode_t err; int idx, outside_node; re_node_set new_nodes; #ifdef DEBUG assert (cur_nodes->nelem); #endif err = re_node_set_alloc (&new_nodes, cur_nodes->nelem); if (BE (err != REG_NOERROR, 0)) return err; /* Create a new node set NEW_NODES with the nodes which are epsilon closures of the node in CUR_NODES. */ for (idx = 0; idx < cur_nodes->nelem; ++idx) { int cur_node = cur_nodes->elems[idx]; const re_node_set *eclosure = dfa->eclosures + cur_node; outside_node = find_subexp_node (dfa, eclosure, ex_subexp, type); if (outside_node == -1) { /* There are no problematic nodes, just merge them. */ err = re_node_set_merge (&new_nodes, eclosure); if (BE (err != REG_NOERROR, 0)) { re_node_set_free (&new_nodes); return err; } } else { /* There are problematic nodes, re-calculate incrementally. */ err = check_arrival_expand_ecl_sub (dfa, &new_nodes, cur_node, ex_subexp, type); if (BE (err != REG_NOERROR, 0)) { re_node_set_free (&new_nodes); return err; } } } re_node_set_free (cur_nodes); *cur_nodes = new_nodes; return REG_NOERROR; } /* Helper function for check_arrival_expand_ecl. Check incrementally the epsilon closure of TARGET, and if it isn't problematic append it to DST_NODES. */ static reg_errcode_t internal_function __attribute_warn_unused_result__ check_arrival_expand_ecl_sub (const re_dfa_t *dfa, re_node_set *dst_nodes, int target, int ex_subexp, int type) { int cur_node; for (cur_node = target; !re_node_set_contains (dst_nodes, cur_node);) { int err; if (dfa->nodes[cur_node].type == type && dfa->nodes[cur_node].opr.idx == ex_subexp) { if (type == OP_CLOSE_SUBEXP) { err = re_node_set_insert (dst_nodes, cur_node); if (BE (err == -1, 0)) return REG_ESPACE; } break; } err = re_node_set_insert (dst_nodes, cur_node); if (BE (err == -1, 0)) return REG_ESPACE; if (dfa->edests[cur_node].nelem == 0) break; if (dfa->edests[cur_node].nelem == 2) { err = check_arrival_expand_ecl_sub (dfa, dst_nodes, dfa->edests[cur_node].elems[1], ex_subexp, type); if (BE (err != REG_NOERROR, 0)) return err; } cur_node = dfa->edests[cur_node].elems[0]; } return REG_NOERROR; } /* For all the back references in the current state, calculate the destination of the back references by the appropriate entry in MCTX->BKREF_ENTS. */ static reg_errcode_t internal_function __attribute_warn_unused_result__ expand_bkref_cache (re_match_context_t *mctx, re_node_set *cur_nodes, int cur_str, int subexp_num, int type) { const re_dfa_t *const dfa = mctx->dfa; reg_errcode_t err; int cache_idx_start = search_cur_bkref_entry (mctx, cur_str); struct re_backref_cache_entry *ent; if (cache_idx_start == -1) return REG_NOERROR; restart: ent = mctx->bkref_ents + cache_idx_start; do { int to_idx, next_node; /* Is this entry ENT is appropriate? */ if (!re_node_set_contains (cur_nodes, ent->node)) continue; /* No. */ to_idx = cur_str + ent->subexp_to - ent->subexp_from; /* Calculate the destination of the back reference, and append it to MCTX->STATE_LOG. */ if (to_idx == cur_str) { /* The backreference did epsilon transit, we must re-check all the node in the current state. */ re_node_set new_dests; reg_errcode_t err2, err3; next_node = dfa->edests[ent->node].elems[0]; if (re_node_set_contains (cur_nodes, next_node)) continue; err = re_node_set_init_1 (&new_dests, next_node); err2 = check_arrival_expand_ecl (dfa, &new_dests, subexp_num, type); err3 = re_node_set_merge (cur_nodes, &new_dests); re_node_set_free (&new_dests); if (BE (err != REG_NOERROR || err2 != REG_NOERROR || err3 != REG_NOERROR, 0)) { err = (err != REG_NOERROR ? err : (err2 != REG_NOERROR ? err2 : err3)); return err; } /* TODO: It is still inefficient... */ goto restart; } else { re_node_set union_set; next_node = dfa->nexts[ent->node]; if (mctx->state_log[to_idx]) { int ret; if (re_node_set_contains (&mctx->state_log[to_idx]->nodes, next_node)) continue; err = re_node_set_init_copy (&union_set, &mctx->state_log[to_idx]->nodes); ret = re_node_set_insert (&union_set, next_node); if (BE (err != REG_NOERROR || ret < 0, 0)) { re_node_set_free (&union_set); err = err != REG_NOERROR ? err : REG_ESPACE; return err; } } else { err = re_node_set_init_1 (&union_set, next_node); if (BE (err != REG_NOERROR, 0)) return err; } mctx->state_log[to_idx] = re_acquire_state (&err, dfa, &union_set); re_node_set_free (&union_set); if (BE (mctx->state_log[to_idx] == NULL && err != REG_NOERROR, 0)) return err; } } while (ent++->more); return REG_NOERROR; } /* Build transition table for the state. Return 1 if succeeded, otherwise return NULL. */ static int internal_function build_trtable (const re_dfa_t *dfa, re_dfastate_t *state) { reg_errcode_t err; int i, j, ch, need_word_trtable = 0; bitset_word_t elem, mask; bool dests_node_malloced = false; bool dest_states_malloced = false; int ndests; /* Number of the destination states from `state'. */ re_dfastate_t **trtable; re_dfastate_t **dest_states = NULL, **dest_states_word, **dest_states_nl; re_node_set follows, *dests_node; bitset_t *dests_ch; bitset_t acceptable; struct dests_alloc { re_node_set dests_node[SBC_MAX]; bitset_t dests_ch[SBC_MAX]; } *dests_alloc; /* We build DFA states which corresponds to the destination nodes from `state'. `dests_node[i]' represents the nodes which i-th destination state contains, and `dests_ch[i]' represents the characters which i-th destination state accepts. */ if (__libc_use_alloca (sizeof (struct dests_alloc))) dests_alloc = (struct dests_alloc *) alloca (sizeof (struct dests_alloc)); else { dests_alloc = re_malloc (struct dests_alloc, 1); if (BE (dests_alloc == NULL, 0)) return 0; dests_node_malloced = true; } dests_node = dests_alloc->dests_node; dests_ch = dests_alloc->dests_ch; /* Initialize transiton table. */ state->word_trtable = state->trtable = NULL; /* At first, group all nodes belonging to `state' into several destinations. */ ndests = group_nodes_into_DFAstates (dfa, state, dests_node, dests_ch); if (BE (ndests <= 0, 0)) { if (dests_node_malloced) free (dests_alloc); /* Return 0 in case of an error, 1 otherwise. */ if (ndests == 0) { state->trtable = (re_dfastate_t **) calloc (sizeof (re_dfastate_t *), SBC_MAX); if (BE (state->trtable == NULL, 0)) return 0; return 1; } return 0; } err = re_node_set_alloc (&follows, ndests + 1); if (BE (err != REG_NOERROR, 0)) goto out_free; /* Avoid arithmetic overflow in size calculation. */ if (BE ((((SIZE_MAX - (sizeof (re_node_set) + sizeof (bitset_t)) * SBC_MAX) / (3 * sizeof (re_dfastate_t *))) < ndests), 0)) goto out_free; if (__libc_use_alloca ((sizeof (re_node_set) + sizeof (bitset_t)) * SBC_MAX + ndests * 3 * sizeof (re_dfastate_t *))) dest_states = (re_dfastate_t **) alloca (ndests * 3 * sizeof (re_dfastate_t *)); else { dest_states = (re_dfastate_t **) malloc (ndests * 3 * sizeof (re_dfastate_t *)); if (BE (dest_states == NULL, 0)) { out_free: if (dest_states_malloced) free (dest_states); re_node_set_free (&follows); for (i = 0; i < ndests; ++i) re_node_set_free (dests_node + i); if (dests_node_malloced) free (dests_alloc); return 0; } dest_states_malloced = true; } dest_states_word = dest_states + ndests; dest_states_nl = dest_states_word + ndests; bitset_empty (acceptable); /* Then build the states for all destinations. */ for (i = 0; i < ndests; ++i) { int next_node; re_node_set_empty (&follows); /* Merge the follows of this destination states. */ for (j = 0; j < dests_node[i].nelem; ++j) { next_node = dfa->nexts[dests_node[i].elems[j]]; if (next_node != -1) { err = re_node_set_merge (&follows, dfa->eclosures + next_node); if (BE (err != REG_NOERROR, 0)) goto out_free; } } dest_states[i] = re_acquire_state_context (&err, dfa, &follows, 0); if (BE (dest_states[i] == NULL && err != REG_NOERROR, 0)) goto out_free; /* If the new state has context constraint, build appropriate states for these contexts. */ if (dest_states[i]->has_constraint) { dest_states_word[i] = re_acquire_state_context (&err, dfa, &follows, CONTEXT_WORD); if (BE (dest_states_word[i] == NULL && err != REG_NOERROR, 0)) goto out_free; if (dest_states[i] != dest_states_word[i] && dfa->mb_cur_max > 1) need_word_trtable = 1; dest_states_nl[i] = re_acquire_state_context (&err, dfa, &follows, CONTEXT_NEWLINE); if (BE (dest_states_nl[i] == NULL && err != REG_NOERROR, 0)) goto out_free; } else { dest_states_word[i] = dest_states[i]; dest_states_nl[i] = dest_states[i]; } bitset_merge (acceptable, dests_ch[i]); } if (!BE (need_word_trtable, 0)) { /* We don't care about whether the following character is a word character, or we are in a single-byte character set so we can discern by looking at the character code: allocate a 256-entry transition table. */ trtable = state->trtable = (re_dfastate_t **) calloc (sizeof (re_dfastate_t *), SBC_MAX); if (BE (trtable == NULL, 0)) goto out_free; /* For all characters ch...: */ for (i = 0; i < BITSET_WORDS; ++i) for (ch = i * BITSET_WORD_BITS, elem = acceptable[i], mask = 1; elem; mask <<= 1, elem >>= 1, ++ch) if (BE (elem & 1, 0)) { /* There must be exactly one destination which accepts character ch. See group_nodes_into_DFAstates. */ for (j = 0; (dests_ch[j][i] & mask) == 0; ++j) ; /* j-th destination accepts the word character ch. */ if (dfa->word_char[i] & mask) trtable[ch] = dest_states_word[j]; else trtable[ch] = dest_states[j]; } } else { /* We care about whether the following character is a word character, and we are in a multi-byte character set: discern by looking at the character code: build two 256-entry transition tables, one starting at trtable[0] and one starting at trtable[SBC_MAX]. */ trtable = state->word_trtable = (re_dfastate_t **) calloc (sizeof (re_dfastate_t *), 2 * SBC_MAX); if (BE (trtable == NULL, 0)) goto out_free; /* For all characters ch...: */ for (i = 0; i < BITSET_WORDS; ++i) for (ch = i * BITSET_WORD_BITS, elem = acceptable[i], mask = 1; elem; mask <<= 1, elem >>= 1, ++ch) if (BE (elem & 1, 0)) { /* There must be exactly one destination which accepts character ch. See group_nodes_into_DFAstates. */ for (j = 0; (dests_ch[j][i] & mask) == 0; ++j) ; /* j-th destination accepts the word character ch. */ trtable[ch] = dest_states[j]; trtable[ch + SBC_MAX] = dest_states_word[j]; } } /* new line */ if (bitset_contain (acceptable, NEWLINE_CHAR)) { /* The current state accepts newline character. */ for (j = 0; j < ndests; ++j) if (bitset_contain (dests_ch[j], NEWLINE_CHAR)) { /* k-th destination accepts newline character. */ trtable[NEWLINE_CHAR] = dest_states_nl[j]; if (need_word_trtable) trtable[NEWLINE_CHAR + SBC_MAX] = dest_states_nl[j]; /* There must be only one destination which accepts newline. See group_nodes_into_DFAstates. */ break; } } if (dest_states_malloced) free (dest_states); re_node_set_free (&follows); for (i = 0; i < ndests; ++i) re_node_set_free (dests_node + i); if (dests_node_malloced) free (dests_alloc); return 1; } /* Group all nodes belonging to STATE into several destinations. Then for all destinations, set the nodes belonging to the destination to DESTS_NODE[i] and set the characters accepted by the destination to DEST_CH[i]. This function return the number of destinations. */ static int internal_function group_nodes_into_DFAstates (const re_dfa_t *dfa, const re_dfastate_t *state, re_node_set *dests_node, bitset_t *dests_ch) { reg_errcode_t err; int result; int i, j, k; int ndests; /* Number of the destinations from `state'. */ bitset_t accepts; /* Characters a node can accept. */ const re_node_set *cur_nodes = &state->nodes; bitset_empty (accepts); ndests = 0; /* For all the nodes belonging to `state', */ for (i = 0; i < cur_nodes->nelem; ++i) { re_token_t *node = &dfa->nodes[cur_nodes->elems[i]]; re_token_type_t type = node->type; unsigned int constraint = node->constraint; /* Enumerate all single byte character this node can accept. */ if (type == CHARACTER) bitset_set (accepts, node->opr.c); else if (type == SIMPLE_BRACKET) { bitset_merge (accepts, node->opr.sbcset); } else if (type == OP_PERIOD) { #ifdef RE_ENABLE_I18N if (dfa->mb_cur_max > 1) bitset_merge (accepts, dfa->sb_char); else #endif bitset_set_all (accepts); if (!(dfa->syntax & RE_DOT_NEWLINE)) bitset_clear (accepts, '\n'); if (dfa->syntax & RE_DOT_NOT_NULL) bitset_clear (accepts, '\0'); } #ifdef RE_ENABLE_I18N else if (type == OP_UTF8_PERIOD) { memset (accepts, '\xff', sizeof (bitset_t) / 2); if (!(dfa->syntax & RE_DOT_NEWLINE)) bitset_clear (accepts, '\n'); if (dfa->syntax & RE_DOT_NOT_NULL) bitset_clear (accepts, '\0'); } #endif else continue; /* Check the `accepts' and sift the characters which are not match it the context. */ if (constraint) { if (constraint & NEXT_NEWLINE_CONSTRAINT) { bool accepts_newline = bitset_contain (accepts, NEWLINE_CHAR); bitset_empty (accepts); if (accepts_newline) bitset_set (accepts, NEWLINE_CHAR); else continue; } if (constraint & NEXT_ENDBUF_CONSTRAINT) { bitset_empty (accepts); continue; } if (constraint & NEXT_WORD_CONSTRAINT) { bitset_word_t any_set = 0; if (type == CHARACTER && !node->word_char) { bitset_empty (accepts); continue; } #ifdef RE_ENABLE_I18N if (dfa->mb_cur_max > 1) for (j = 0; j < BITSET_WORDS; ++j) any_set |= (accepts[j] &= (dfa->word_char[j] | ~dfa->sb_char[j])); else #endif for (j = 0; j < BITSET_WORDS; ++j) any_set |= (accepts[j] &= dfa->word_char[j]); if (!any_set) continue; } if (constraint & NEXT_NOTWORD_CONSTRAINT) { bitset_word_t any_set = 0; if (type == CHARACTER && node->word_char) { bitset_empty (accepts); continue; } #ifdef RE_ENABLE_I18N if (dfa->mb_cur_max > 1) for (j = 0; j < BITSET_WORDS; ++j) any_set |= (accepts[j] &= ~(dfa->word_char[j] & dfa->sb_char[j])); else #endif for (j = 0; j < BITSET_WORDS; ++j) any_set |= (accepts[j] &= ~dfa->word_char[j]); if (!any_set) continue; } } /* Then divide `accepts' into DFA states, or create a new state. Above, we make sure that accepts is not empty. */ for (j = 0; j < ndests; ++j) { bitset_t intersec; /* Intersection sets, see below. */ bitset_t remains; /* Flags, see below. */ bitset_word_t has_intersec, not_subset, not_consumed; /* Optimization, skip if this state doesn't accept the character. */ if (type == CHARACTER && !bitset_contain (dests_ch[j], node->opr.c)) continue; /* Enumerate the intersection set of this state and `accepts'. */ has_intersec = 0; for (k = 0; k < BITSET_WORDS; ++k) has_intersec |= intersec[k] = accepts[k] & dests_ch[j][k]; /* And skip if the intersection set is empty. */ if (!has_intersec) continue; /* Then check if this state is a subset of `accepts'. */ not_subset = not_consumed = 0; for (k = 0; k < BITSET_WORDS; ++k) { not_subset |= remains[k] = ~accepts[k] & dests_ch[j][k]; not_consumed |= accepts[k] = accepts[k] & ~dests_ch[j][k]; } /* If this state isn't a subset of `accepts', create a new group state, which has the `remains'. */ if (not_subset) { bitset_copy (dests_ch[ndests], remains); bitset_copy (dests_ch[j], intersec); err = re_node_set_init_copy (dests_node + ndests, &dests_node[j]); if (BE (err != REG_NOERROR, 0)) goto error_return; ++ndests; } /* Put the position in the current group. */ result = re_node_set_insert (&dests_node[j], cur_nodes->elems[i]); if (BE (result < 0, 0)) goto error_return; /* If all characters are consumed, go to next node. */ if (!not_consumed) break; } /* Some characters remain, create a new group. */ if (j == ndests) { bitset_copy (dests_ch[ndests], accepts); err = re_node_set_init_1 (dests_node + ndests, cur_nodes->elems[i]); if (BE (err != REG_NOERROR, 0)) goto error_return; ++ndests; bitset_empty (accepts); } } return ndests; error_return: for (j = 0; j < ndests; ++j) re_node_set_free (dests_node + j); return -1; } #ifdef RE_ENABLE_I18N /* Check how many bytes the node `dfa->nodes[node_idx]' accepts. Return the number of the bytes the node accepts. STR_IDX is the current index of the input string. This function handles the nodes which can accept one character, or one collating element like '.', '[a-z]', opposite to the other nodes can only accept one byte. */ static int internal_function check_node_accept_bytes (const re_dfa_t *dfa, int node_idx, const re_string_t *input, int str_idx) { const re_token_t *node = dfa->nodes + node_idx; int char_len, elem_len; int i; if (BE (node->type == OP_UTF8_PERIOD, 0)) { unsigned char c = re_string_byte_at (input, str_idx), d; if (BE (c < 0xc2, 1)) return 0; if (str_idx + 2 > input->len) return 0; d = re_string_byte_at (input, str_idx + 1); if (c < 0xe0) return (d < 0x80 || d > 0xbf) ? 0 : 2; else if (c < 0xf0) { char_len = 3; if (c == 0xe0 && d < 0xa0) return 0; } else if (c < 0xf8) { char_len = 4; if (c == 0xf0 && d < 0x90) return 0; } else if (c < 0xfc) { char_len = 5; if (c == 0xf8 && d < 0x88) return 0; } else if (c < 0xfe) { char_len = 6; if (c == 0xfc && d < 0x84) return 0; } else return 0; if (str_idx + char_len > input->len) return 0; for (i = 1; i < char_len; ++i) { d = re_string_byte_at (input, str_idx + i); if (d < 0x80 || d > 0xbf) return 0; } return char_len; } char_len = re_string_char_size_at (input, str_idx); if (node->type == OP_PERIOD) { if (char_len <= 1) return 0; /* FIXME: I don't think this if is needed, as both '\n' and '\0' are char_len == 1. */ /* '.' accepts any one character except the following two cases. */ if ((!(dfa->syntax & RE_DOT_NEWLINE) && re_string_byte_at (input, str_idx) == '\n') || ((dfa->syntax & RE_DOT_NOT_NULL) && re_string_byte_at (input, str_idx) == '\0')) return 0; return char_len; } elem_len = re_string_elem_size_at (input, str_idx); if ((elem_len <= 1 && char_len <= 1) || char_len == 0) return 0; if (node->type == COMPLEX_BRACKET) { const re_charset_t *cset = node->opr.mbcset; # ifdef _LIBC const unsigned char *pin = ((const unsigned char *) re_string_get_buffer (input) + str_idx); int j; uint32_t nrules; # endif /* _LIBC */ int match_len = 0; wchar_t wc = ((cset->nranges || cset->nchar_classes || cset->nmbchars) ? re_string_wchar_at (input, str_idx) : 0); /* match with multibyte character? */ for (i = 0; i < cset->nmbchars; ++i) if (wc == cset->mbchars[i]) { match_len = char_len; goto check_node_accept_bytes_match; } /* match with character_class? */ for (i = 0; i < cset->nchar_classes; ++i) { wctype_t wt = cset->char_classes[i]; if (__iswctype (wc, wt)) { match_len = char_len; goto check_node_accept_bytes_match; } } # ifdef _LIBC nrules = _NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES); if (nrules != 0) { unsigned int in_collseq = 0; const int32_t *table, *indirect; const unsigned char *weights, *extra; const char *collseqwc; /* This #include defines a local function! */ # include /* match with collating_symbol? */ if (cset->ncoll_syms) extra = (const unsigned char *) _NL_CURRENT (LC_COLLATE, _NL_COLLATE_SYMB_EXTRAMB); for (i = 0; i < cset->ncoll_syms; ++i) { const unsigned char *coll_sym = extra + cset->coll_syms[i]; /* Compare the length of input collating element and the length of current collating element. */ if (*coll_sym != elem_len) continue; /* Compare each bytes. */ for (j = 0; j < *coll_sym; j++) if (pin[j] != coll_sym[1 + j]) break; if (j == *coll_sym) { /* Match if every bytes is equal. */ match_len = j; goto check_node_accept_bytes_match; } } if (cset->nranges) { if (elem_len <= char_len) { collseqwc = _NL_CURRENT (LC_COLLATE, _NL_COLLATE_COLLSEQWC); in_collseq = __collseq_table_lookup (collseqwc, wc); } else in_collseq = find_collation_sequence_value (pin, elem_len); } /* match with range expression? */ for (i = 0; i < cset->nranges; ++i) if (cset->range_starts[i] <= in_collseq && in_collseq <= cset->range_ends[i]) { match_len = elem_len; goto check_node_accept_bytes_match; } /* match with equivalence_class? */ if (cset->nequiv_classes) { const unsigned char *cp = pin; table = (const int32_t *) _NL_CURRENT (LC_COLLATE, _NL_COLLATE_TABLEMB); weights = (const unsigned char *) _NL_CURRENT (LC_COLLATE, _NL_COLLATE_WEIGHTMB); extra = (const unsigned char *) _NL_CURRENT (LC_COLLATE, _NL_COLLATE_EXTRAMB); indirect = (const int32_t *) _NL_CURRENT (LC_COLLATE, _NL_COLLATE_INDIRECTMB); int32_t idx = findidx (&cp, elem_len); if (idx > 0) for (i = 0; i < cset->nequiv_classes; ++i) { int32_t equiv_class_idx = cset->equiv_classes[i]; size_t weight_len = weights[idx & 0xffffff]; if (weight_len == weights[equiv_class_idx & 0xffffff] && (idx >> 24) == (equiv_class_idx >> 24)) { int cnt = 0; idx &= 0xffffff; equiv_class_idx &= 0xffffff; while (cnt <= weight_len && (weights[equiv_class_idx + 1 + cnt] == weights[idx + 1 + cnt])) ++cnt; if (cnt > weight_len) { match_len = elem_len; goto check_node_accept_bytes_match; } } } } } else # endif /* _LIBC */ { /* match with range expression? */ #if __GNUC__ >= 2 wchar_t cmp_buf[] = {L'\0', L'\0', wc, L'\0', L'\0', L'\0'}; #else wchar_t cmp_buf[] = {L'\0', L'\0', L'\0', L'\0', L'\0', L'\0'}; cmp_buf[2] = wc; #endif for (i = 0; i < cset->nranges; ++i) { cmp_buf[0] = cset->range_starts[i]; cmp_buf[4] = cset->range_ends[i]; -#ifdef __FreeBSD__ - if (wcscmp (cmp_buf, cmp_buf + 2) <= 0 - && wcscmp (cmp_buf + 2, cmp_buf + 4) <= 0) -#else if (wcscoll (cmp_buf, cmp_buf + 2) <= 0 && wcscoll (cmp_buf + 2, cmp_buf + 4) <= 0) -#endif { match_len = char_len; goto check_node_accept_bytes_match; } } } check_node_accept_bytes_match: if (!cset->non_match) return match_len; else { if (match_len > 0) return 0; else return (elem_len > char_len) ? elem_len : char_len; } } return 0; } # ifdef _LIBC static unsigned int internal_function find_collation_sequence_value (const unsigned char *mbs, size_t mbs_len) { uint32_t nrules = _NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES); if (nrules == 0) { if (mbs_len == 1) { /* No valid character. Match it as a single byte character. */ const unsigned char *collseq = (const unsigned char *) _NL_CURRENT (LC_COLLATE, _NL_COLLATE_COLLSEQMB); return collseq[mbs[0]]; } return UINT_MAX; } else { int32_t idx; const unsigned char *extra = (const unsigned char *) _NL_CURRENT (LC_COLLATE, _NL_COLLATE_SYMB_EXTRAMB); int32_t extrasize = (const unsigned char *) _NL_CURRENT (LC_COLLATE, _NL_COLLATE_SYMB_EXTRAMB + 1) - extra; for (idx = 0; idx < extrasize;) { int mbs_cnt, found = 0; int32_t elem_mbs_len; /* Skip the name of collating element name. */ idx = idx + extra[idx] + 1; elem_mbs_len = extra[idx++]; if (mbs_len == elem_mbs_len) { for (mbs_cnt = 0; mbs_cnt < elem_mbs_len; ++mbs_cnt) if (extra[idx + mbs_cnt] != mbs[mbs_cnt]) break; if (mbs_cnt == elem_mbs_len) /* Found the entry. */ found = 1; } /* Skip the byte sequence of the collating element. */ idx += elem_mbs_len; /* Adjust for the alignment. */ idx = (idx + 3) & ~3; /* Skip the collation sequence value. */ idx += sizeof (uint32_t); /* Skip the wide char sequence of the collating element. */ idx = idx + sizeof (uint32_t) * (*(int32_t *) (extra + idx) + 1); /* If we found the entry, return the sequence value. */ if (found) return *(uint32_t *) (extra + idx); /* Skip the collation sequence value. */ idx += sizeof (uint32_t); } return UINT_MAX; } } # endif /* _LIBC */ #endif /* RE_ENABLE_I18N */ /* Check whether the node accepts the byte which is IDX-th byte of the INPUT. */ static int internal_function check_node_accept (const re_match_context_t *mctx, const re_token_t *node, int idx) { unsigned char ch; ch = re_string_byte_at (&mctx->input, idx); switch (node->type) { case CHARACTER: if (node->opr.c != ch) return 0; break; case SIMPLE_BRACKET: if (!bitset_contain (node->opr.sbcset, ch)) return 0; break; #ifdef RE_ENABLE_I18N case OP_UTF8_PERIOD: if (ch >= 0x80) return 0; /* FALLTHROUGH */ #endif case OP_PERIOD: if ((ch == '\n' && !(mctx->dfa->syntax & RE_DOT_NEWLINE)) || (ch == '\0' && (mctx->dfa->syntax & RE_DOT_NOT_NULL))) return 0; break; default: return 0; } if (node->constraint) { /* The node has constraints. Check whether the current context satisfies the constraints. */ unsigned int context = re_string_context_at (&mctx->input, idx, mctx->eflags); if (NOT_SATISFY_NEXT_CONSTRAINT (node->constraint, context)) return 0; } return 1; } /* Extend the buffers, if the buffers have run out. */ static reg_errcode_t internal_function __attribute_warn_unused_result__ extend_buffers (re_match_context_t *mctx, int min_len) { reg_errcode_t ret; re_string_t *pstr = &mctx->input; /* Avoid overflow. */ if (BE (INT_MAX / 2 / sizeof (re_dfastate_t *) <= pstr->bufs_len, 0)) return REG_ESPACE; /* Double the lengthes of the buffers, but allocate at least MIN_LEN. */ ret = re_string_realloc_buffers (pstr, MAX (min_len, MIN (pstr->len, pstr->bufs_len * 2))); if (BE (ret != REG_NOERROR, 0)) return ret; if (mctx->state_log != NULL) { /* And double the length of state_log. */ /* XXX We have no indication of the size of this buffer. If this allocation fail we have no indication that the state_log array does not have the right size. */ re_dfastate_t **new_array = re_realloc (mctx->state_log, re_dfastate_t *, pstr->bufs_len + 1); if (BE (new_array == NULL, 0)) return REG_ESPACE; mctx->state_log = new_array; } /* Then reconstruct the buffers. */ if (pstr->icase) { #ifdef RE_ENABLE_I18N if (pstr->mb_cur_max > 1) { ret = build_wcs_upper_buffer (pstr); if (BE (ret != REG_NOERROR, 0)) return ret; } else #endif /* RE_ENABLE_I18N */ build_upper_buffer (pstr); } else { #ifdef RE_ENABLE_I18N if (pstr->mb_cur_max > 1) build_wcs_buffer (pstr); else #endif /* RE_ENABLE_I18N */ { if (pstr->trans != NULL) re_string_translate_buffer (pstr); } } return REG_NOERROR; } /* Functions for matching context. */ /* Initialize MCTX. */ static reg_errcode_t internal_function __attribute_warn_unused_result__ match_ctx_init (re_match_context_t *mctx, int eflags, int n) { mctx->eflags = eflags; mctx->match_last = -1; if (n > 0) { mctx->bkref_ents = re_malloc (struct re_backref_cache_entry, n); mctx->sub_tops = re_malloc (re_sub_match_top_t *, n); if (BE (mctx->bkref_ents == NULL || mctx->sub_tops == NULL, 0)) return REG_ESPACE; } /* Already zero-ed by the caller. else mctx->bkref_ents = NULL; mctx->nbkref_ents = 0; mctx->nsub_tops = 0; */ mctx->abkref_ents = n; mctx->max_mb_elem_len = 1; mctx->asub_tops = n; return REG_NOERROR; } /* Clean the entries which depend on the current input in MCTX. This function must be invoked when the matcher changes the start index of the input, or changes the input string. */ static void internal_function match_ctx_clean (re_match_context_t *mctx) { int st_idx; for (st_idx = 0; st_idx < mctx->nsub_tops; ++st_idx) { int sl_idx; re_sub_match_top_t *top = mctx->sub_tops[st_idx]; for (sl_idx = 0; sl_idx < top->nlasts; ++sl_idx) { re_sub_match_last_t *last = top->lasts[sl_idx]; re_free (last->path.array); re_free (last); } re_free (top->lasts); if (top->path) { re_free (top->path->array); re_free (top->path); } free (top); } mctx->nsub_tops = 0; mctx->nbkref_ents = 0; } /* Free all the memory associated with MCTX. */ static void internal_function match_ctx_free (re_match_context_t *mctx) { /* First, free all the memory associated with MCTX->SUB_TOPS. */ match_ctx_clean (mctx); re_free (mctx->sub_tops); re_free (mctx->bkref_ents); } /* Add a new backreference entry to MCTX. Note that we assume that caller never call this function with duplicate entry, and call with STR_IDX which isn't smaller than any existing entry. */ static reg_errcode_t internal_function __attribute_warn_unused_result__ match_ctx_add_entry (re_match_context_t *mctx, int node, int str_idx, int from, int to) { if (mctx->nbkref_ents >= mctx->abkref_ents) { struct re_backref_cache_entry* new_entry; new_entry = re_realloc (mctx->bkref_ents, struct re_backref_cache_entry, mctx->abkref_ents * 2); if (BE (new_entry == NULL, 0)) { re_free (mctx->bkref_ents); return REG_ESPACE; } mctx->bkref_ents = new_entry; memset (mctx->bkref_ents + mctx->nbkref_ents, '\0', sizeof (struct re_backref_cache_entry) * mctx->abkref_ents); mctx->abkref_ents *= 2; } if (mctx->nbkref_ents > 0 && mctx->bkref_ents[mctx->nbkref_ents - 1].str_idx == str_idx) mctx->bkref_ents[mctx->nbkref_ents - 1].more = 1; mctx->bkref_ents[mctx->nbkref_ents].node = node; mctx->bkref_ents[mctx->nbkref_ents].str_idx = str_idx; mctx->bkref_ents[mctx->nbkref_ents].subexp_from = from; mctx->bkref_ents[mctx->nbkref_ents].subexp_to = to; /* This is a cache that saves negative results of check_dst_limits_calc_pos. If bit N is clear, means that this entry won't epsilon-transition to an OP_OPEN_SUBEXP or OP_CLOSE_SUBEXP for the N+1-th subexpression. If it is set, check_dst_limits_calc_pos_1 will recurse and try to find one such node. A backreference does not epsilon-transition unless it is empty, so set to all zeros if FROM != TO. */ mctx->bkref_ents[mctx->nbkref_ents].eps_reachable_subexps_map = (from == to ? ~0 : 0); mctx->bkref_ents[mctx->nbkref_ents++].more = 0; if (mctx->max_mb_elem_len < to - from) mctx->max_mb_elem_len = to - from; return REG_NOERROR; } /* Search for the first entry which has the same str_idx, or -1 if none is found. Note that MCTX->BKREF_ENTS is already sorted by MCTX->STR_IDX. */ static int internal_function search_cur_bkref_entry (const re_match_context_t *mctx, int str_idx) { int left, right, mid, last; last = right = mctx->nbkref_ents; for (left = 0; left < right;) { mid = (left + right) / 2; if (mctx->bkref_ents[mid].str_idx < str_idx) left = mid + 1; else right = mid; } if (left < last && mctx->bkref_ents[left].str_idx == str_idx) return left; else return -1; } /* Register the node NODE, whose type is OP_OPEN_SUBEXP, and which matches at STR_IDX. */ static reg_errcode_t internal_function __attribute_warn_unused_result__ match_ctx_add_subtop (re_match_context_t *mctx, int node, int str_idx) { #ifdef DEBUG assert (mctx->sub_tops != NULL); assert (mctx->asub_tops > 0); #endif if (BE (mctx->nsub_tops == mctx->asub_tops, 0)) { int new_asub_tops = mctx->asub_tops * 2; re_sub_match_top_t **new_array = re_realloc (mctx->sub_tops, re_sub_match_top_t *, new_asub_tops); if (BE (new_array == NULL, 0)) return REG_ESPACE; mctx->sub_tops = new_array; mctx->asub_tops = new_asub_tops; } mctx->sub_tops[mctx->nsub_tops] = calloc (1, sizeof (re_sub_match_top_t)); if (BE (mctx->sub_tops[mctx->nsub_tops] == NULL, 0)) return REG_ESPACE; mctx->sub_tops[mctx->nsub_tops]->node = node; mctx->sub_tops[mctx->nsub_tops++]->str_idx = str_idx; return REG_NOERROR; } /* Register the node NODE, whose type is OP_CLOSE_SUBEXP, and which matches at STR_IDX, whose corresponding OP_OPEN_SUBEXP is SUB_TOP. */ static re_sub_match_last_t * internal_function match_ctx_add_sublast (re_sub_match_top_t *subtop, int node, int str_idx) { re_sub_match_last_t *new_entry; if (BE (subtop->nlasts == subtop->alasts, 0)) { int new_alasts = 2 * subtop->alasts + 1; re_sub_match_last_t **new_array = re_realloc (subtop->lasts, re_sub_match_last_t *, new_alasts); if (BE (new_array == NULL, 0)) return NULL; subtop->lasts = new_array; subtop->alasts = new_alasts; } new_entry = calloc (1, sizeof (re_sub_match_last_t)); if (BE (new_entry != NULL, 1)) { subtop->lasts[subtop->nlasts] = new_entry; new_entry->node = node; new_entry->str_idx = str_idx; ++subtop->nlasts; } return new_entry; } static void internal_function sift_ctx_init (re_sift_context_t *sctx, re_dfastate_t **sifted_sts, re_dfastate_t **limited_sts, int last_node, int last_str_idx) { sctx->sifted_states = sifted_sts; sctx->limited_states = limited_sts; sctx->last_node = last_node; sctx->last_str_idx = last_str_idx; re_node_set_init_empty (&sctx->limits); }