1/*
2 * Copyright (c) 2015 Joerg Jung <[email protected]>
3 *
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16
17/*
18 * portable fgetln() version, NOT reentrant
19 */
20
21#include <stdio.h>
22#include <stdlib.h>
23#include <errno.h>
24
25#include "compat.h"
26
27char *
28fgetln(FILE *fp, size_t *len)
29{
30 static char *buf = NULL;
31 static size_t bufsz = 0;
32 size_t r = 0;
33 char *p;
34 int c, e;
35
36 if (!fp || !len) {
37 errno = EINVAL;
38 return NULL;
39 }
40 if (!buf) {
41 if (!(buf = calloc(1, BUFSIZ)))
42 return NULL;
43 bufsz = BUFSIZ;
44 }
45 while ((c = getc(fp)) != EOF) {
46 buf[r++] = c;
47 if (r == bufsz) {
48 if (!(p = reallocarray(buf, 2, bufsz))) {
49 e = errno;
50 free(buf);
51 errno = e;
52 buf = NULL, bufsz = 0;
53 return NULL;
54 }
55 buf = p, bufsz = 2 * bufsz;
56 }
57 if (c == '\n')
58 break;
59 }
60 return (*len = r) ? buf : NULL;
61}
62