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 | |
27 | char * |
28 | fgetln(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 | |