1/* $Id: compat_getline.c,v 1.2 2020/06/15 01:37:14 schwarze Exp $ */
2/*
3 * Copyright (c) 2015 Ingo Schwarze <schwarze@openbsd.org>
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17#include "config.h"
18
19#include <sys/types.h>
20#include <errno.h>
21#include <stdio.h>
22#include <stdlib.h>
23
24ssize_t
25getline(char **buf, size_t *bufsz, FILE *fp)
26{
27	char	*nbuf;
28	size_t	 nbufsz, pos;
29	int	 c;
30
31	if (buf == NULL || bufsz == NULL) {
32		errno = EINVAL;
33		return -1;
34	}
35
36	if (*buf == NULL)
37		*bufsz = 0;
38	else
39		**buf = '\0';
40
41	pos = 0;
42	for (;;) {
43		if (pos + 1 >= *bufsz) {
44			nbufsz = *bufsz ? *bufsz * 2 : BUFSIZ;
45			if ((nbuf = realloc(*buf, nbufsz)) == NULL)
46				return -1;
47			*buf = nbuf;
48			*bufsz = nbufsz;
49		}
50		if ((c = fgetc(fp)) == EOF) {
51			(*buf)[pos] = '\0';
52			return pos > 0 && feof(fp) ? (ssize_t)pos : -1;
53		}
54		(*buf)[pos++] = c;
55		(*buf)[pos] = '\0';
56		if (c == '\n')
57			return pos;
58	}
59}
60