1 /* $NetBSD: fparseln.c,v 1.7 2007/03/08 19:57:53 drochner 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.
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
35 #include <sys/types.h>
43 static int isescaped(const char *, const char *, int);
46 * Return true if the character in *p that belongs to a string
47 * that starts in *sp, is escaped by the escape character esc.
50 isescaped(const char *sp, const char *p, int esc)
56 _DIAGASSERT(sp != NULL);
57 _DIAGASSERT(p != NULL);
60 /* No escape character */
64 /* Count the number of escape characters that precede ours */
65 for (ne = 0, cp = p; --cp >= sp && *cp == esc; ne++)
68 /* Return true if odd number of escape characters */
74 * Read a line from a file parsing continuations ending in \
75 * and eliminating trailing newlines, or comments starting with
79 fparseln(FILE *fp, size_t *size, size_t *lineno, const char str[3], int flags)
81 static const char dstr[3] = { '\\', '\\', '#' };
87 char esc, con, nl, com;
90 _DIAGASSERT(fp != NULL);
104 * XXX: it would be cool to be able to specify the newline character,
105 * but unfortunately, fgetln does not let us
115 if ((ptr = fgetln(fp, &s)) == NULL)
118 if (s && com) { /* Check and eliminate comments */
119 for (cp = ptr; cp < ptr + s; cp++)
120 if (*cp == com && !isescaped(ptr, cp, esc)) {
122 cnt = s == 0 && buf == NULL;
127 if (s && nl) { /* Check and eliminate newlines */
131 s--; /* forget newline */
134 if (s && con) { /* Check and eliminate continuations */
137 if (*cp == con && !isescaped(ptr, cp, esc)) {
138 s--; /* forget continuation char */
145 * nothing to add, skip realloc except in case
146 * we need a minimal buf to return an empty line
148 if (cnt || buf != NULL)
152 if ((cp = realloc(buf, len + s + 1)) == NULL) {
158 (void) memcpy(buf + len, ptr, s);
163 if ((flags & FPARSELN_UNESCALL) != 0 && esc && buf != NULL &&
164 strchr(buf, esc) != NULL) {
166 while (cp[0] != '\0') {
169 while (cp[0] != '\0' && cp[0] != esc)
171 if (cp[0] == '\0' || cp[1] == '\0')
176 skipesc += (flags & FPARSELN_UNESCCOMM);
178 skipesc += (flags & FPARSELN_UNESCCONT);
180 skipesc += (flags & FPARSELN_UNESCESC);
181 if (cp[1] != com && cp[1] != con && cp[1] != esc)
182 skipesc = (flags & FPARSELN_UNESCREST);
202 main(int argc, char *argv[])
208 while ((ptr = fparseln(stdin, &size, &line, NULL,
209 FPARSELN_UNESCALL)) != NULL)
210 printf("line %d (%d) |%s|\n", line, size, ptr);
220 line 4 \# Not comment \\\\