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
46char *
47fgetln(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
94int
95main(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