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.
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 escape */
143 if (s
== 0 && buf
!= NULL
)
146 if ((cp
= realloc(buf
, len
+ s
+ 1)) == NULL
) {
152 (void) memcpy(buf
+ len
, ptr
, s
);
157 if ((flags
& FPARSELN_UNESCALL
) != 0 && esc
&& buf
!= NULL
&&
158 strchr(buf
, esc
) != NULL
) {
160 while (cp
[0] != '\0') {
163 while (cp
[0] != '\0' && cp
[0] != esc
)
165 if (cp
[0] == '\0' || cp
[1] == '\0')
170 skipesc
+= (flags
& FPARSELN_UNESCCOMM
);
172 skipesc
+= (flags
& FPARSELN_UNESCCONT
);
174 skipesc
+= (flags
& FPARSELN_UNESCESC
);
175 if (cp
[1] != com
&& cp
[1] != con
&& cp
[1] != esc
)
176 skipesc
= (flags
& FPARSELN_UNESCREST
);
196 main(int argc
, char *argv
[])
202 while ((ptr
= fparseln(stdin
, &size
, &line
, NULL
,
203 FPARSELN_UNESCALL
)) != NULL
)
204 printf("line %d (%d) |%s|\n", line
, size
, ptr
);
214 line 4 \# Not comment \\\\