Differential D5912 Diff 15080 contrib/blacklist/port/fparseln.c

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contrib/blacklist/port/fparseln.c

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				/* $NetBSD: fparseln.c,v 1.1 2015/01/22 03:48:07 christos Exp $ */

				/*
				* Copyright (c) 1997 Christos Zoulas. All rights reserved.
				*
				* 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.
				*
				* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
				*/
				#ifdef HAVE_CONFIG_H
				#include "config.h"
				#endif

				#include <sys/cdefs.h>
				#if defined(LIBC_SCCS) && !defined(lint)
				__RCSID("$NetBSD: fparseln.c,v 1.1 2015/01/22 03:48:07 christos Exp $");
				#endif /* LIBC_SCCS and not lint */

				#include <assert.h>
				#include <errno.h>
				#include <stdio.h>
				#include <string.h>
				#include <stdlib.h>

				#if ! HAVE_FPARSELN \|\| BROKEN_FPARSELN

				#define FLOCKFILE(fp)
				#define FUNLOCKFILE(fp)

				#if defined(_REENTRANT) && !HAVE_NBTOOL_CONFIG_H
				#define __fgetln(f, l) __fgetstr(f, l, '\n')
				#else
				#define __fgetln(f, l) fgetln(f, l)
				#endif

				static int isescaped(const char , const char , int);

				/* isescaped():
				* Return true if the character in *p that belongs to a string
				* that starts in *sp, is escaped by the escape character esc.
				*/
				static int
				isescaped(const char sp, const char p, int esc)
				{
				const char *cp;
				size_t ne;

				/* No escape character */
				if (esc == '\0')
				return 0;

				/* Count the number of escape characters that precede ours */
				for (ne = 0, cp = p; --cp >= sp && *cp == esc; ne++)
				continue;

				/* Return true if odd number of escape characters */
				return (ne & 1) != 0;
				}


				/* fparseln():
				* Read a line from a file parsing continuations ending in \
				* and eliminating trailing newlines, or comments starting with
				* the comment char.
				*/
				char *
				fparseln(FILE fp, size_t size, size_t *lineno, const char str[3], int flags)
				{
				static const char dstr[3] = { '\\', '\\', '#' };

				size_t s, len;
				char *buf;
				char ptr, cp;
				int cnt;
				char esc, con, nl, com;

				len = 0;
				buf = NULL;
				cnt = 1;

				if (str == NULL)
				str = dstr;

				esc = str[0];
				con = str[1];
				com = str[2];
				/*
				* XXX: it would be cool to be able to specify the newline character,
				* but unfortunately, fgetln does not let us
				*/
				nl = '\n';

				FLOCKFILE(fp);

				while (cnt) {
				cnt = 0;

				if (lineno)
				(*lineno)++;

				if ((ptr = __fgetln(fp, &s)) == NULL)
				break;

				if (s && com) { /* Check and eliminate comments */
				for (cp = ptr; cp < ptr + s; cp++)
				if (*cp == com && !isescaped(ptr, cp, esc)) {
				s = cp - ptr;
				cnt = s == 0 && buf == NULL;
				break;
				}
				}

				if (s && nl) { /* Check and eliminate newlines */
				cp = &ptr[s - 1];

				if (*cp == nl)
				s--; /* forget newline */
				}

				if (s && con) { /* Check and eliminate continuations */
				cp = &ptr[s - 1];

				if (*cp == con && !isescaped(ptr, cp, esc)) {
				s--; /* forget continuation char */
				cnt = 1;
				}
				}

				if (s == 0) {
				/*
				* nothing to add, skip realloc except in case
				* we need a minimal buf to return an empty line
				*/
				if (cnt \|\| buf != NULL)
				continue;
				}

				if ((cp = realloc(buf, len + s + 1)) == NULL) {
				FUNLOCKFILE(fp);
				free(buf);
				return NULL;
				}
				buf = cp;

				(void) memcpy(buf + len, ptr, s);
				len += s;
				buf[len] = '\0';
				}

				FUNLOCKFILE(fp);

				if ((flags & FPARSELN_UNESCALL) != 0 && esc && buf != NULL &&
				strchr(buf, esc) != NULL) {
				ptr = cp = buf;
				while (cp[0] != '\0') {
				int skipesc;

				while (cp[0] != '\0' && cp[0] != esc)
				ptr++ = cp++;
				if (cp[0] == '\0' \|\| cp[1] == '\0')
				break;

				skipesc = 0;
				if (cp[1] == com)
				skipesc += (flags & FPARSELN_UNESCCOMM);
				if (cp[1] == con)
				skipesc += (flags & FPARSELN_UNESCCONT);
				if (cp[1] == esc)
				skipesc += (flags & FPARSELN_UNESCESC);
				if (cp[1] != com && cp[1] != con && cp[1] != esc)
				skipesc = (flags & FPARSELN_UNESCREST);

				if (skipesc)
				cp++;
				else
				ptr++ = cp++;
				ptr++ = cp++;
				}
				*ptr = '\0';
				len = strlen(buf);
				}

				if (size)
				*size = len;
				return buf;
				}

				#ifdef TEST

				int main(int, char **);

				int
				main(int argc, char **argv)
				{
				char *ptr;
				size_t size, line;

				line = 0;
				while ((ptr = fparseln(stdin, &size, &line, NULL,
				FPARSELN_UNESCALL)) != NULL)
				printf("line %d (%d) \|%s\|\n", line, size, ptr);
				return 0;
				}

				/*

				# This is a test
				line 1
				line 2 \
				line 3 # Comment
				line 4 \# Not comment \\\\

				# And a comment \
				line 5 \\\
				line 6

				*/

				#endif /* TEST */
				#endif /* ! HAVE_FPARSELN \|\| BROKEN_FPARSELN */