1 /* $NetBSD: fparseln.c,v 1.9 1999/09/20 04:48:06 lukem Exp $ */
2 /* $FreeBSD: src/lib/libutil/fparseln.c,v 1.2 1999/12/29 17:50:33 peter Exp $ */
3 /* $DragonFly: src/lib/libutil/fparseln.c,v 1.6 2005/03/16 07:35:48 cpressey Exp $ */
6 * Copyright (c) 1997 Christos Zoulas. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by Christos Zoulas.
19 * 4. The name of the author may not be used to endorse or promote products
20 * derived from this software without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 * $FreeBSD: src/lib/libutil/fparseln.c,v 1.2 1999/12/29 17:50:33 peter Exp $
36 #include <sys/types.h>
46 static int isescaped (const char *, const char *, int);
49 * Return true if the character in *p that belongs to a string
50 * that starts in *sp, is escaped by the escape character esc.
53 isescaped(const char *sp
, const char *p
, int esc
)
58 _DIAGASSERT(sp
!= NULL
);
59 _DIAGASSERT(p
!= NULL
);
61 /* No escape character */
65 /* Count the number of escape characters that precede ours */
66 for (ne
= 0, cp
= p
; --cp
>= sp
&& *cp
== esc
; ne
++)
69 /* Return true if odd number of escape characters */
75 * Read a line from a file parsing continuations ending in \
76 * and eliminating trailing newlines, or comments starting with
80 fparseln(FILE *fp
, size_t *size
, size_t *lineno
, const char str
[3], int flags
)
82 static const char dstr
[3] = { '\\', '\\', '#' };
88 char esc
, con
, nl
, com
;
90 _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 \\\\