1 /* $NetBSD: fgetln.c,v 1.1 2015/01/22 03:48:07 christos 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_CONFIG_H
33 #include "config.h"
34 #endif
35
36 #if !HAVE_FGETLN
37 #include <stdlib.h>
38 #ifndef HAVE_NBTOOL_CONFIG_H
39 /* These headers are required, but included from nbtool_config.h */
40 #include <stdio.h>
41 #include <unistd.h>
42 #include <errno.h>
43 #include <string.h>
44 #endif
45
46 char *
fgetln(FILE * fp,size_t * len)47 fgetln(FILE *fp, size_t *len)
48 {
49 static char *buf = NULL;
50 static size_t bufsiz = 0;
51 char *ptr;
52
53
54 if (buf == NULL) {
55 bufsiz = BUFSIZ;
56 if ((buf = malloc(bufsiz)) == NULL)
57 return NULL;
58 }
59
60 if (fgets(buf, bufsiz, fp) == NULL)
61 return NULL;
62
63 *len = 0;
64 while ((ptr = strchr(&buf[*len], '\n')) == NULL) {
65 size_t nbufsiz = bufsiz + BUFSIZ;
66 char *nbuf = realloc(buf, nbufsiz);
67
68 if (nbuf == NULL) {
69 int oerrno = errno;
70 free(buf);
71 errno = oerrno;
72 buf = NULL;
73 return NULL;
74 } else
75 buf = nbuf;
76
77 if (fgets(&buf[bufsiz], BUFSIZ, fp) == NULL) {
78 buf[bufsiz] = '\0';
79 *len = strlen(buf);
80 return buf;
81 }
82
83 *len = bufsiz;
84 bufsiz = nbufsiz;
85 }
86
87 *len = (ptr - buf) + 1;
88 return buf;
89 }
90
91 #endif
92
93 #ifdef TEST
94 int
main(int argc,char * argv[])95 main(int argc, char *argv[])
96 {
97 char *p;
98 size_t len;
99
100 while ((p = fgetln(stdin, &len)) != NULL) {
101 (void)printf("%zu %s", len, p);
102 free(p);
103 }
104 return 0;
105 }
106 #endif
107