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 */