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comparison extern/libcompat/src/strndup.c @ 258:f978fa0137ce

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extern: provide libcompat
author David Demelier <markand@malikania.fr>
date Sat, 05 Dec 2020 15:57:02 +0100
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257:251de91394b7 258:f978fa0137ce
1 /*
2 * strndup.c -- strndup implementation
3 *
4 * Copyright (c) 2020 David Demelier <markand@malikania.fr>
5 *
6 * Permission to use, copy, modify, and/or distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 #include <assert.h>
20 #include <stdlib.h>
21 #include <string.h>
22
23 /* Requires strnlen. */
24 #include "compat.h"
25
26 char *
27 strndup(const char *src, size_t max)
28 {
29 assert(src);
30
31 char *ret;
32 size_t length;
33
34 length = strnlen(src, max);
35
36 if (!(ret = malloc(length + 1)))
37 return NULL;
38
39 ret[length] = '\0';
40
41 return memcpy(ret, src, length);
42 }