1/*
2 * dhcpcd - DHCP client daemon
3 * Copyright (c) 2006-2009 Roy Marples <roy@marples.name>
4 * All rights reserved
5
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <errno.h>
29#include <stdint.h>
30#include <stdlib.h>
31#include <stdio.h>
32#include <string.h>
33
34#include "getline.h"
35
36/* Redefine a small buffer for our simple text config files */
37#undef BUFSIZ
38#define BUFSIZ 128
39
40ssize_t
41getline(char ** __restrict buf, size_t * __restrict buflen,
42    FILE * __restrict fp)
43{
44	size_t bytes, newlen;
45	char *newbuf, *p;
46
47	if (buf == NULL || buflen == NULL) {
48		errno = EINVAL;
49		return -1;
50	}
51	if (*buf == NULL)
52		*buflen = 0;
53
54	bytes = 0;
55	do {
56		if (feof(fp))
57			break;
58		if (*buf == NULL || bytes != 0) {
59			newlen = *buflen + BUFSIZ;
60			newbuf = realloc(*buf, newlen);
61			if (newbuf == NULL)
62				return -1;
63			*buf = newbuf;
64			*buflen = newlen;
65		}
66		p = *buf + bytes;
67		memset(p, 0, BUFSIZ);
68		if (fgets(p, BUFSIZ, fp) == NULL)
69			break;
70		bytes += strlen(p);
71	} while (bytes == 0 || *(*buf + (bytes - 1)) != '\n');
72	if (bytes == 0)
73		return -1;
74	return bytes;
75}
76