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
47char *
48fgetln(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
95int
96main(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