1 /* $NetBSD: fparseln.c,v 1.9 1999/09/20 04:48:06 lukem 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.
31 * $FreeBSD: head/lib/libutil/fparseln.c 121193 2003-10-18 10:04:16Z markm $
34 #include <sys/types.h>
42 static int isescaped(const char *, const char *, int);
45 * Return true if the character in *p that belongs to a string
46 * that starts in *sp, is escaped by the escape character esc.
49 isescaped(const char *sp, const char *p, int esc)
55 _DIAGASSERT(sp != NULL);
56 _DIAGASSERT(p != NULL);
59 /* No escape character */
63 /* Count the number of escape characters that precede ours */
64 for (ne = 0, cp = p; --cp >= sp && *cp == esc; ne++)
67 /* Return true if odd number of escape characters */
73 * Read a line from a file parsing continuations ending in \
74 * and eliminating trailing newlines, or comments starting with
78 fparseln(FILE *fp, size_t *size, size_t *lineno, const char str[3], int flags)
80 static const char dstr[3] = { '\\', '\\', '#' };
86 char esc, con, nl, com;
89 _DIAGASSERT(fp != NULL);
103 * XXX: it would be cool to be able to specify the newline character,
104 * but unfortunately, fgetln does not let us
114 if ((ptr = fgetln(fp, &s)) == NULL)
117 if (s && com) { /* Check and eliminate comments */
118 for (cp = ptr; cp < ptr + s; cp++)
119 if (*cp == com && !isescaped(ptr, cp, esc)) {
121 cnt = s == 0 && buf == NULL;
126 if (s && nl) { /* Check and eliminate newlines */
130 s--; /* forget newline */
133 if (s && con) { /* Check and eliminate continuations */
136 if (*cp == con && !isescaped(ptr, cp, esc)) {
137 s--; /* forget escape */
142 if (s == 0 && buf != NULL)
145 if ((cp = realloc(buf, len + s + 1)) == NULL) {
151 (void) memcpy(buf + len, ptr, s);
156 if ((flags & FPARSELN_UNESCALL) != 0 && esc && buf != NULL &&
157 strchr(buf, esc) != NULL) {
159 while (cp[0] != '\0') {
162 while (cp[0] != '\0' && cp[0] != esc)
164 if (cp[0] == '\0' || cp[1] == '\0')
169 skipesc += (flags & FPARSELN_UNESCCOMM);
171 skipesc += (flags & FPARSELN_UNESCCONT);
173 skipesc += (flags & FPARSELN_UNESCESC);
174 if (cp[1] != com && cp[1] != con && cp[1] != esc)
175 skipesc = (flags & FPARSELN_UNESCREST);
195 main(int argc, char *argv[])
201 while ((ptr = fparseln(stdin, &size, &line, NULL,
202 FPARSELN_UNESCALL)) != NULL)
203 printf("line %d (%d) |%s|\n", line, size, ptr);
213 line 4 \# Not comment \\\\