1 /* $NetBSD: fgetln.c,v 1.9 2008/04/29 06:53:03 martin Exp $ */
2
3 /*-
4 * Copyright (c) 1998 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Christos Zoulas.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #ifdef HAVE_NBTOOL_CONFIG_H
33 #include "nbtool_config.h"
34 #endif
35
36 #if !HAVE_FGETLN
37 #include "config.h"
38 #include <stdlib.h>
39 #ifndef HAVE_NBTOOL_CONFIG_H
40 /* These headers are required, but included from nbtool_config.h */
41 #include <stdio.h>
42 #include <unistd.h>
43 #include <errno.h>
44 #include <string.h>
45 #endif
46
47 char *
fgetln(FILE * fp,size_t * len)48 fgetln(FILE *fp, size_t *len)
49 {
50 static char *buf = NULL;
51 static size_t bufsiz = 0;
52 char *ptr;
53
54
55 if (buf == NULL) {
56 bufsiz = BUFSIZ;
57 if ((buf = malloc(bufsiz)) == NULL)
58 return NULL;
59 }
60
61 if (fgets(buf, bufsiz, fp) == NULL)
62 return NULL;
63
64 *len = 0;
65 while ((ptr = strchr(&buf[*len], '\n')) == NULL) {
66 size_t nbufsiz = bufsiz + BUFSIZ;
67 char *nbuf = realloc(buf, nbufsiz);
68
69 if (nbuf == NULL) {
70 int oerrno = errno;
71 free(buf);
72 errno = oerrno;
73 buf = NULL;
74 return NULL;
75 } else
76 buf = nbuf;
77
78 if (fgets(&buf[bufsiz], BUFSIZ, fp) == NULL) {
79 buf[bufsiz] = '\0';
80 *len = strlen(buf);
81 return buf;
82 }
83
84 *len = bufsiz;
85 bufsiz = nbufsiz;
86 }
87
88 *len = (ptr - buf) + 1;
89 return buf;
90 }
91
92 #endif
93
94 #ifdef TEST
95 int
main(int argc,char * argv[])96 main(int argc, char *argv[])
97 {
98 char *p;
99 size_t len;
100
101 while ((p = fgetln(stdin, &len)) != NULL) {
102 (void)printf("%zu %s", len, p);
103 free(p);
104 }
105 return 0;
106 }
107 #endif
108