1 /* $NetBSD: fparseln.c,v 1.2 2003/09/06 23:03:02 grant Exp $ */
4 * Copyright (c) 1997 Christos Zoulas. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed by Christos Zoulas.
17 * 4. The name of the author may not be used to endorse or promote products
18 * derived from this software without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 #include <nbcompat/cdefs.h>
34 #if defined(LIBC_SCCS) && !defined(lint)
35 __RCSID("$NetBSD: fparseln.c,v 1.5 2004/06/20 22:20:15 jmc Exp $");
36 #endif /* LIBC_SCCS and not lint */
39 #include "namespace.h"
42 #include <nbcompat/assert.h>
46 #include <nbcompat/stdio.h>
47 #include <nbcompat/string.h>
48 #include <nbcompat/stdlib.h>
52 __weak_alias(fparseln,_fparseln)
59 #ifndef HAVE_NBTOOL_CONFIG_H
60 #include "reentrant.h"
64 #define FUNLOCKFILE(fp)
69 #if defined(_REENTRANT) && !HAVE_NBTOOL_CONFIG_H
70 #define __fgetln(f, l) __fgetstr(f, l, '\n')
72 #define __fgetln(f, l) fgetln(f, l)
76 static int isescaped(const char *, const char *, int);
79 * Return true if the character in *p that belongs to a string
80 * that starts in *sp, is escaped by the escape character esc.
83 isescaped(const char *sp, const char *p, int esc)
88 /* No escape character */
92 /* Count the number of escape characters that precede ours */
93 for (ne = 0, cp = p; --cp >= sp && *cp == esc; ne++)
96 /* Return true if odd number of escape characters */
102 * Read a line from a file parsing continuations ending in \
103 * and eliminating trailing newlines, or comments starting with
107 fparseln(FILE *fp, size_t *size, size_t *lineno, const char str[3], int flags)
109 static const char dstr[3] = { '\\', '\\', '#' };
115 char esc, con, nl, com;
128 * XXX: it would be cool to be able to specify the newline character,
129 * but unfortunately, fgetln does not let us
139 if ((ptr = fgetln(fp, &s)) == NULL)
142 if (s && com) { /* Check and eliminate comments */
143 for (cp = ptr; cp < ptr + s; cp++)
144 if (*cp == com && !isescaped(ptr, cp, esc)) {
146 cnt = s == 0 && buf == NULL;
151 if (s && nl) { /* Check and eliminate newlines */
155 s--; /* forget newline */
158 if (s && con) { /* Check and eliminate continuations */
161 if (*cp == con && !isescaped(ptr, cp, esc)) {
162 s--; /* forget escape */
167 if (s == 0 && buf != NULL)
170 if ((cp = realloc(buf, len + s + 1)) == NULL) {
176 (void) memcpy(buf + len, ptr, s);
181 if ((flags & FPARSELN_UNESCALL) != 0 && esc && buf != NULL &&
182 strchr(buf, esc) != NULL) {
184 while (cp[0] != '\0') {
187 while (cp[0] != '\0' && cp[0] != esc)
189 if (cp[0] == '\0' || cp[1] == '\0')
194 skipesc += (flags & FPARSELN_UNESCCOMM);
196 skipesc += (flags & FPARSELN_UNESCCONT);
198 skipesc += (flags & FPARSELN_UNESCESC);
199 if (cp[1] != com && cp[1] != con && cp[1] != esc)
200 skipesc = (flags & FPARSELN_UNESCREST);
219 int main(int, char *[]);
222 main(int argc, char *argv[])
228 while ((ptr = fparseln(stdin, &size, &line, NULL,
229 FPARSELN_UNESCALL)) != NULL)
230 printf("line %d (%d) |%s|\n", line, size, ptr);
240 line 4 \# Not comment \\\\
249 #endif /* ! HAVE_FPARSELN */