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