1 /* $NetBSD: fparseln.c,v 1.1 2015/01/22 03:48:07 christos 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.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 #include <sys/cdefs.h>
31 #if defined(LIBC_SCCS) && !defined(lint)
32 __RCSID("$NetBSD: fparseln.c,v 1.1 2015/01/22 03:48:07 christos Exp $");
33 #endif /* LIBC_SCCS and not lint */
41 #if ! HAVE_FPARSELN || BROKEN_FPARSELN
44 #define FUNLOCKFILE(fp)
46 #if defined(_REENTRANT) && !HAVE_NBTOOL_CONFIG_H
47 #define __fgetln(f, l) __fgetstr(f, l, '\n')
49 #define __fgetln(f, l) fgetln(f, l)
52 static int isescaped(const char *, const char *, int);
55 * Return true if the character in *p that belongs to a string
56 * that starts in *sp, is escaped by the escape character esc.
59 isescaped(const char *sp, const char *p, int esc)
64 /* No escape character */
68 /* Count the number of escape characters that precede ours */
69 for (ne = 0, cp = p; --cp >= sp && *cp == esc; ne++)
72 /* Return true if odd number of escape characters */
78 * Read a line from a file parsing continuations ending in \
79 * and eliminating trailing newlines, or comments starting with
83 fparseln(FILE *fp, size_t *size, size_t *lineno, const char str[3], int flags)
85 static const char dstr[3] = { '\\', '\\', '#' };
91 char esc, con, nl, com;
104 * XXX: it would be cool to be able to specify the newline character,
105 * but unfortunately, fgetln does not let us
117 if ((ptr = __fgetln(fp, &s)) == NULL)
120 if (s && com) { /* Check and eliminate comments */
121 for (cp = ptr; cp < ptr + s; cp++)
122 if (*cp == com && !isescaped(ptr, cp, esc)) {
124 cnt = s == 0 && buf == NULL;
129 if (s && nl) { /* Check and eliminate newlines */
133 s--; /* forget newline */
136 if (s && con) { /* Check and eliminate continuations */
139 if (*cp == con && !isescaped(ptr, cp, esc)) {
140 s--; /* forget continuation char */
147 * nothing to add, skip realloc except in case
148 * we need a minimal buf to return an empty line
150 if (cnt || buf != NULL)
154 if ((cp = realloc(buf, len + s + 1)) == NULL) {
161 (void) memcpy(buf + len, ptr, s);
168 if ((flags & FPARSELN_UNESCALL) != 0 && esc && buf != NULL &&
169 strchr(buf, esc) != NULL) {
171 while (cp[0] != '\0') {
174 while (cp[0] != '\0' && cp[0] != esc)
176 if (cp[0] == '\0' || cp[1] == '\0')
181 skipesc += (flags & FPARSELN_UNESCCOMM);
183 skipesc += (flags & FPARSELN_UNESCCONT);
185 skipesc += (flags & FPARSELN_UNESCESC);
186 if (cp[1] != com && cp[1] != con && cp[1] != esc)
187 skipesc = (flags & FPARSELN_UNESCREST);
206 int main(int, char **);
209 main(int argc, char **argv)
215 while ((ptr = fparseln(stdin, &size, &line, NULL,
216 FPARSELN_UNESCALL)) != NULL)
217 printf("line %d (%d) |%s|\n", line, size, ptr);
227 line 4 \# Not comment \\\\
236 #endif /* ! HAVE_FPARSELN || BROKEN_FPARSELN */