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
40 ssize_t
getline(char ** __restrict buf,size_t * __restrict buflen,FILE * __restrict fp)41 getline(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 || *buflen < BUFSIZ) {
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