1/*	$NetBSD: fgetln.c,v 1.11 2015/10/08 20:33:58 christos Exp $	*/
2
3/*
4 * Copyright (c) 2015 Joerg Jung <jung@openbsd.org>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19/*
20 * portable fgetln() version
21 */
22
23#ifdef HAVE_NBTOOL_CONFIG_H
24#include "nbtool_config.h"
25#endif
26
27#if !HAVE_FGETLN
28#include <stdlib.h>
29#ifndef HAVE_NBTOOL_CONFIG_H
30/* These headers are required, but included from nbtool_config.h */
31#include <stdio.h>
32#include <stdlib.h>
33#include <errno.h>
34#endif
35
36char *
37fgetln(FILE *fp, size_t *len)
38{
39	static char *buf = NULL;
40	static size_t bufsz = 0;
41	size_t r = 0;
42	char *p;
43	int c, e;
44
45	if (!fp || !len) {
46		errno = EINVAL;
47		return NULL;
48	}
49	if (!buf) {
50		if (!(buf = calloc(1, BUFSIZ)))
51			return NULL;
52		bufsz = BUFSIZ;
53	}
54	while ((c = getc(fp)) != EOF) {
55		buf[r++] = c;
56		if (r == bufsz) {
57			/*
58			 * Original uses reallocarray() but we don't have it
59			 * in tools.
60			 */
61			if (!(p = realloc(buf, 2 * bufsz))) {
62				e = errno;
63				free(buf);
64				errno = e;
65				buf = NULL, bufsz = 0;
66				return NULL;
67			}
68			buf = p, bufsz = 2 * bufsz;
69		}
70		if (c == '\n')
71			break;
72	}
73	return (*len = r) ? buf : NULL;
74}
75#endif
76
77
78#ifdef TEST
79int
80main(int argc, char *argv[])
81{
82	char *p;
83	size_t len;
84
85	while ((p = fgetln(stdin, &len)) != NULL) {
86		(void)printf("%zu %s", len, p);
87		free(p);
88	}
89	return 0;
90}
91#endif
92