Index: head/bin/sh/var.c =================================================================== --- head/bin/sh/var.c (revision 342739) +++ head/bin/sh/var.c (revision 342740) @@ -1,971 +1,971 @@ /*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 1991, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Kenneth Almquist. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef lint #if 0 static char sccsid[] = "@(#)var.c 8.3 (Berkeley) 5/4/95"; #endif #endif /* not lint */ #include __FBSDID("$FreeBSD$"); #include #include #include /* * Shell variables. */ #include #include #include "shell.h" #include "output.h" #include "expand.h" #include "nodes.h" /* for other headers */ #include "eval.h" /* defines cmdenviron */ #include "exec.h" #include "syntax.h" #include "options.h" #include "mail.h" #include "var.h" #include "memalloc.h" #include "error.h" #include "mystring.h" #include "parser.h" #include "builtins.h" #ifndef NO_HISTORY #include "myhistedit.h" #endif #ifndef VTABSIZE #define VTABSIZE 39 #endif struct varinit { struct var *var; int flags; const char *text; void (*func)(const char *); }; #ifndef NO_HISTORY struct var vhistsize; struct var vterm; #endif struct var vifs; struct var vmail; struct var vmpath; struct var vpath; struct var vps1; struct var vps2; struct var vps4; static struct var voptind; struct var vdisvfork; struct localvar *localvars; int forcelocal; static const struct varinit varinit[] = { #ifndef NO_HISTORY { &vhistsize, VUNSET, "HISTSIZE=", sethistsize }, #endif { &vifs, 0, "IFS= \t\n", NULL }, { &vmail, VUNSET, "MAIL=", NULL }, { &vmpath, VUNSET, "MAILPATH=", NULL }, { &vpath, 0, "PATH=" _PATH_DEFPATH, changepath }, /* * vps1 depends on uid */ { &vps2, 0, "PS2=> ", NULL }, { &vps4, 0, "PS4=+ ", NULL }, #ifndef NO_HISTORY { &vterm, VUNSET, "TERM=", setterm }, #endif { &voptind, 0, "OPTIND=1", getoptsreset }, { &vdisvfork, VUNSET, "SH_DISABLE_VFORK=", NULL }, { NULL, 0, NULL, NULL } }; static struct var *vartab[VTABSIZE]; static const char *const locale_names[7] = { "LC_COLLATE", "LC_CTYPE", "LC_MONETARY", "LC_NUMERIC", "LC_TIME", "LC_MESSAGES", NULL }; static const int locale_categories[7] = { LC_COLLATE, LC_CTYPE, LC_MONETARY, LC_NUMERIC, LC_TIME, LC_MESSAGES, 0 }; static int varequal(const char *, const char *); static struct var *find_var(const char *, struct var ***, int *); static int localevar(const char *); static void setvareq_const(const char *s, int flags); extern char **environ; /* * This routine initializes the builtin variables and imports the environment. * It is called when the shell is initialized. */ void initvar(void) { char ppid[20]; const struct varinit *ip; struct var *vp; struct var **vpp; char **envp; for (ip = varinit ; (vp = ip->var) != NULL ; ip++) { if (find_var(ip->text, &vpp, &vp->name_len) != NULL) continue; vp->next = *vpp; *vpp = vp; vp->text = __DECONST(char *, ip->text); vp->flags = ip->flags | VSTRFIXED | VTEXTFIXED; vp->func = ip->func; } /* * PS1 depends on uid */ if (find_var("PS1", &vpp, &vps1.name_len) == NULL) { vps1.next = *vpp; *vpp = &vps1; vps1.text = __DECONST(char *, geteuid() ? "PS1=$ " : "PS1=# "); vps1.flags = VSTRFIXED|VTEXTFIXED; } fmtstr(ppid, sizeof(ppid), "%d", (int)getppid()); setvarsafe("PPID", ppid, 0); for (envp = environ ; *envp ; envp++) { if (strchr(*envp, '=')) { setvareq(*envp, VEXPORT|VTEXTFIXED); } } setvareq_const("OPTIND=1", 0); setvareq_const("IFS= \t\n", 0); } /* * Safe version of setvar, returns 1 on success 0 on failure. */ int setvarsafe(const char *name, const char *val, int flags) { struct jmploc jmploc; struct jmploc *const savehandler = handler; int err = 0; int inton; inton = is_int_on(); if (setjmp(jmploc.loc)) err = 1; else { handler = &jmploc; setvar(name, val, flags); } handler = savehandler; SETINTON(inton); return err; } /* * Set the value of a variable. The flags argument is stored with the * flags of the variable. If val is NULL, the variable is unset. */ void setvar(const char *name, const char *val, int flags) { const char *p; size_t len; size_t namelen; size_t vallen; char *nameeq; int isbad; isbad = 0; p = name; if (! is_name(*p)) isbad = 1; p++; for (;;) { if (! is_in_name(*p)) { if (*p == '\0' || *p == '=') break; isbad = 1; } p++; } namelen = p - name; if (isbad) error("%.*s: bad variable name", (int)namelen, name); len = namelen + 2; /* 2 is space for '=' and '\0' */ if (val == NULL) { flags |= VUNSET; vallen = 0; } else { vallen = strlen(val); len += vallen; } INTOFF; nameeq = ckmalloc(len); memcpy(nameeq, name, namelen); nameeq[namelen] = '='; if (val) memcpy(nameeq + namelen + 1, val, vallen + 1); else nameeq[namelen + 1] = '\0'; setvareq(nameeq, flags); INTON; } static int localevar(const char *s) { const char *const *ss; if (*s != 'L') return 0; if (varequal(s + 1, "ANG")) return 1; if (strncmp(s + 1, "C_", 2) != 0) return 0; if (varequal(s + 3, "ALL")) return 1; for (ss = locale_names; *ss ; ss++) if (varequal(s + 3, *ss + 3)) return 1; return 0; } /* * Sets/unsets an environment variable from a pointer that may actually be a * pointer into environ where the string should not be manipulated. */ static void change_env(const char *s, int set) { char *eqp; char *ss; INTOFF; ss = savestr(s); if ((eqp = strchr(ss, '=')) != NULL) *eqp = '\0'; if (set && eqp != NULL) (void) setenv(ss, eqp + 1, 1); else (void) unsetenv(ss); ckfree(ss); INTON; return; } /* * Same as setvar except that the variable and value are passed in * the first argument as name=value. Since the first argument will * be actually stored in the table, it should not be a string that * will go away. */ void setvareq(char *s, int flags) { struct var *vp, **vpp; int nlen; if (aflag) flags |= VEXPORT; if (forcelocal && !(flags & (VNOSET | VNOLOCAL))) mklocal(s); vp = find_var(s, &vpp, &nlen); if (vp != NULL) { if (vp->flags & VREADONLY) { if ((flags & (VTEXTFIXED|VSTACK)) == 0) ckfree(s); error("%.*s: is read only", vp->name_len, vp->text); } if (flags & VNOSET) { if ((flags & (VTEXTFIXED|VSTACK)) == 0) ckfree(s); return; } INTOFF; if (vp->func && (flags & VNOFUNC) == 0) (*vp->func)(s + vp->name_len + 1); if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0) ckfree(vp->text); vp->flags &= ~(VTEXTFIXED|VSTACK|VUNSET); vp->flags |= flags; vp->text = s; /* * We could roll this to a function, to handle it as * a regular variable function callback, but why bother? * * Note: this assumes iflag is not set to 1 initially. * As part of initvar(), this is called before arguments * are looked at. */ if ((vp == &vmpath || (vp == &vmail && ! mpathset())) && iflag == 1) chkmail(1); if ((vp->flags & VEXPORT) && localevar(s)) { change_env(s, 1); (void) setlocale(LC_ALL, ""); updatecharset(); } INTON; return; } /* not found */ if (flags & VNOSET) { if ((flags & (VTEXTFIXED|VSTACK)) == 0) ckfree(s); return; } INTOFF; vp = ckmalloc(sizeof (*vp)); vp->flags = flags; vp->text = s; vp->name_len = nlen; vp->next = *vpp; vp->func = NULL; *vpp = vp; if ((vp->flags & VEXPORT) && localevar(s)) { change_env(s, 1); (void) setlocale(LC_ALL, ""); updatecharset(); } INTON; } static void setvareq_const(const char *s, int flags) { setvareq(__DECONST(char *, s), flags | VTEXTFIXED); } /* * Process a linked list of variable assignments. */ void listsetvar(struct arglist *list, int flags) { int i; INTOFF; for (i = 0; i < list->count; i++) setvareq(savestr(list->args[i]), flags); INTON; } /* * Find the value of a variable. Returns NULL if not set. */ char * lookupvar(const char *name) { struct var *v; v = find_var(name, NULL, NULL); if (v == NULL || v->flags & VUNSET) return NULL; return v->text + v->name_len + 1; } /* * Search the environment of a builtin command. If the second argument * is nonzero, return the value of a variable even if it hasn't been * exported. */ char * bltinlookup(const char *name, int doall) { struct var *v; char *result; int i; result = NULL; if (cmdenviron) for (i = 0; i < cmdenviron->count; i++) { if (varequal(cmdenviron->args[i], name)) result = strchr(cmdenviron->args[i], '=') + 1; } if (result != NULL) return result; v = find_var(name, NULL, NULL); if (v == NULL || v->flags & VUNSET || (!doall && (v->flags & VEXPORT) == 0)) return NULL; return v->text + v->name_len + 1; } /* * Set up locale for a builtin (LANG/LC_* assignments). */ void bltinsetlocale(void) { int act = 0; char *loc, *locdef; int i; if (cmdenviron) for (i = 0; i < cmdenviron->count; i++) { if (localevar(cmdenviron->args[i])) { act = 1; break; } } if (!act) return; loc = bltinlookup("LC_ALL", 0); INTOFF; if (loc != NULL) { setlocale(LC_ALL, loc); INTON; updatecharset(); return; } locdef = bltinlookup("LANG", 0); for (i = 0; locale_names[i] != NULL; i++) { loc = bltinlookup(locale_names[i], 0); if (loc == NULL) loc = locdef; if (loc != NULL) setlocale(locale_categories[i], loc); } INTON; updatecharset(); } /* * Undo the effect of bltinlocaleset(). */ void bltinunsetlocale(void) { int i; INTOFF; if (cmdenviron) for (i = 0; i < cmdenviron->count; i++) { if (localevar(cmdenviron->args[i])) { setlocale(LC_ALL, ""); updatecharset(); break; } } INTON; } /* * Update the localeisutf8 flag. */ void updatecharset(void) { char *charset; charset = nl_langinfo(CODESET); localeisutf8 = !strcmp(charset, "UTF-8"); } void initcharset(void) { updatecharset(); initial_localeisutf8 = localeisutf8; } /* * Generate a list of exported variables. This routine is used to construct * the third argument to execve when executing a program. */ char ** environment(void) { int nenv; struct var **vpp; struct var *vp; char **env, **ep; nenv = 0; for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { for (vp = *vpp ; vp ; vp = vp->next) - if (vp->flags & VEXPORT) + if ((vp->flags & (VEXPORT|VUNSET)) == VEXPORT) nenv++; } ep = env = stalloc((nenv + 1) * sizeof *env); for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { for (vp = *vpp ; vp ; vp = vp->next) - if (vp->flags & VEXPORT) + if ((vp->flags & (VEXPORT|VUNSET)) == VEXPORT) *ep++ = vp->text; } *ep = NULL; return env; } static int var_compare(const void *a, const void *b) { const char *const *sa, *const *sb; sa = a; sb = b; /* * This compares two var=value strings which creates a different * order from what you would probably expect. POSIX is somewhat * ambiguous on what should be sorted exactly. */ return strcoll(*sa, *sb); } /* * Command to list all variables which are set. This is invoked from the * set command when it is called without any options or operands. */ int showvarscmd(int argc __unused, char **argv __unused) { struct var **vpp; struct var *vp; const char *s; const char **vars; int i, n; /* * POSIX requires us to sort the variables. */ n = 0; for (vpp = vartab; vpp < vartab + VTABSIZE; vpp++) { for (vp = *vpp; vp; vp = vp->next) { if (!(vp->flags & VUNSET)) n++; } } INTOFF; vars = ckmalloc(n * sizeof(*vars)); i = 0; for (vpp = vartab; vpp < vartab + VTABSIZE; vpp++) { for (vp = *vpp; vp; vp = vp->next) { if (!(vp->flags & VUNSET)) vars[i++] = vp->text; } } qsort(vars, n, sizeof(*vars), var_compare); for (i = 0; i < n; i++) { /* * Skip improper variable names so the output remains usable as * shell input. */ if (!isassignment(vars[i])) continue; s = strchr(vars[i], '='); s++; outbin(vars[i], s - vars[i], out1); out1qstr(s); out1c('\n'); } ckfree(vars); INTON; return 0; } /* * The export and readonly commands. */ int exportcmd(int argc __unused, char **argv) { struct var **vpp; struct var *vp; char **ap; char *name; char *p; char *cmdname; int ch, values; int flag = argv[0][0] == 'r'? VREADONLY : VEXPORT; cmdname = argv[0]; values = 0; while ((ch = nextopt("p")) != '\0') { switch (ch) { case 'p': values = 1; break; } } if (values && *argptr != NULL) error("-p requires no arguments"); if (*argptr != NULL) { for (ap = argptr; (name = *ap) != NULL; ap++) { if ((p = strchr(name, '=')) != NULL) { p++; } else { vp = find_var(name, NULL, NULL); if (vp != NULL) { vp->flags |= flag; if ((vp->flags & VEXPORT) && localevar(vp->text)) { change_env(vp->text, 1); (void) setlocale(LC_ALL, ""); updatecharset(); } continue; } } setvar(name, p, flag); } } else { for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { for (vp = *vpp ; vp ; vp = vp->next) { if (vp->flags & flag) { if (values) { /* * Skip improper variable names * so the output remains usable * as shell input. */ if (!isassignment(vp->text)) continue; out1str(cmdname); out1c(' '); } if (values && !(vp->flags & VUNSET)) { outbin(vp->text, vp->name_len + 1, out1); out1qstr(vp->text + vp->name_len + 1); } else outbin(vp->text, vp->name_len, out1); out1c('\n'); } } } } return 0; } /* * The "local" command. */ int localcmd(int argc __unused, char **argv __unused) { char *name; nextopt(""); if (! in_function()) error("Not in a function"); while ((name = *argptr++) != NULL) { mklocal(name); } return 0; } /* * Make a variable a local variable. When a variable is made local, it's * value and flags are saved in a localvar structure. The saved values * will be restored when the shell function returns. We handle the name * "-" as a special case. */ void mklocal(char *name) { struct localvar *lvp; struct var **vpp; struct var *vp; INTOFF; lvp = ckmalloc(sizeof (struct localvar)); if (name[0] == '-' && name[1] == '\0') { lvp->text = ckmalloc(sizeof optval); memcpy(lvp->text, optval, sizeof optval); vp = NULL; } else { vp = find_var(name, &vpp, NULL); if (vp == NULL) { if (strchr(name, '=')) setvareq(savestr(name), VSTRFIXED | VNOLOCAL); else setvar(name, NULL, VSTRFIXED | VNOLOCAL); vp = *vpp; /* the new variable */ lvp->text = NULL; lvp->flags = VUNSET; } else { lvp->text = vp->text; lvp->flags = vp->flags; vp->flags |= VSTRFIXED|VTEXTFIXED; if (name[vp->name_len] == '=') setvareq(savestr(name), VNOLOCAL); } } lvp->vp = vp; lvp->next = localvars; localvars = lvp; INTON; } /* * Called after a function returns. */ void poplocalvars(void) { struct localvar *lvp; struct var *vp; int islocalevar; INTOFF; while ((lvp = localvars) != NULL) { localvars = lvp->next; vp = lvp->vp; if (vp == NULL) { /* $- saved */ memcpy(optval, lvp->text, sizeof optval); ckfree(lvp->text); optschanged(); } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) { vp->flags &= ~VREADONLY; (void)unsetvar(vp->text); } else { islocalevar = (vp->flags | lvp->flags) & VEXPORT && localevar(lvp->text); if ((vp->flags & VTEXTFIXED) == 0) ckfree(vp->text); vp->flags = lvp->flags; vp->text = lvp->text; if (vp->func) (*vp->func)(vp->text + vp->name_len + 1); if (islocalevar) { change_env(vp->text, vp->flags & VEXPORT && (vp->flags & VUNSET) == 0); setlocale(LC_ALL, ""); updatecharset(); } } ckfree(lvp); } INTON; } int setvarcmd(int argc, char **argv) { if (argc <= 2) return unsetcmd(argc, argv); else if (argc == 3) setvar(argv[1], argv[2], 0); else error("too many arguments"); return 0; } /* * The unset builtin command. */ int unsetcmd(int argc __unused, char **argv __unused) { char **ap; int i; int flg_func = 0; int flg_var = 0; int ret = 0; while ((i = nextopt("vf")) != '\0') { if (i == 'f') flg_func = 1; else flg_var = 1; } if (flg_func == 0 && flg_var == 0) flg_var = 1; INTOFF; for (ap = argptr; *ap ; ap++) { if (flg_func) ret |= unsetfunc(*ap); if (flg_var) ret |= unsetvar(*ap); } INTON; return ret; } /* * Unset the specified variable. * Called with interrupts off. */ int unsetvar(const char *s) { struct var **vpp; struct var *vp; vp = find_var(s, &vpp, NULL); if (vp == NULL) return (0); if (vp->flags & VREADONLY) return (1); if (vp->text[vp->name_len + 1] != '\0') setvar(s, "", 0); if ((vp->flags & VEXPORT) && localevar(vp->text)) { change_env(s, 0); setlocale(LC_ALL, ""); updatecharset(); } vp->flags &= ~VEXPORT; vp->flags |= VUNSET; if ((vp->flags & VSTRFIXED) == 0) { if ((vp->flags & VTEXTFIXED) == 0) ckfree(vp->text); *vpp = vp->next; ckfree(vp); } return (0); } /* * Returns true if the two strings specify the same variable. The first * variable name is terminated by '='; the second may be terminated by * either '=' or '\0'. */ static int varequal(const char *p, const char *q) { while (*p == *q++) { if (*p++ == '=') return 1; } if (*p == '=' && *(q - 1) == '\0') return 1; return 0; } /* * Search for a variable. * 'name' may be terminated by '=' or a NUL. * vppp is set to the pointer to vp, or the list head if vp isn't found * lenp is set to the number of characters in 'name' */ static struct var * find_var(const char *name, struct var ***vppp, int *lenp) { unsigned int hashval; int len; struct var *vp, **vpp; const char *p = name; hashval = 0; while (*p && *p != '=') hashval = 2 * hashval + (unsigned char)*p++; len = p - name; if (lenp) *lenp = len; vpp = &vartab[hashval % VTABSIZE]; if (vppp) *vppp = vpp; for (vp = *vpp ; vp ; vpp = &vp->next, vp = *vpp) { if (vp->name_len != len) continue; if (memcmp(vp->text, name, len) != 0) continue; if (vppp) *vppp = vpp; return vp; } return NULL; }