Mercurial > molko
diff extern/libcompat/src/strndup.c @ 258:f978fa0137ce
extern: provide libcompat
author | David Demelier <markand@malikania.fr> |
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date | Sat, 05 Dec 2020 15:57:02 +0100 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/extern/libcompat/src/strndup.c Sat Dec 05 15:57:02 2020 +0100 @@ -0,0 +1,42 @@ +/* + * strndup.c -- strndup implementation + * + * Copyright (c) 2020 David Demelier <markand@malikania.fr> + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#include <assert.h> +#include <stdlib.h> +#include <string.h> + +/* Requires strnlen. */ +#include "compat.h" + +char * +strndup(const char *src, size_t max) +{ + assert(src); + + char *ret; + size_t length; + + length = strnlen(src, max); + + if (!(ret = malloc(length + 1))) + return NULL; + + ret[length] = '\0'; + + return memcpy(ret, src, length); +}