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/*
* Replacement for a missing strndup.
*
* The canonical version of this file is maintained in the rra-c-util package,
* which can be found at <http://www.eyrie.org/~eagle/software/rra-c-util/>.
*
* Written by Russ Allbery <eagle@eyrie.org>
*
* The authors hereby relinquish any claim to any copyright that they may have
* in this work, whether granted under contract or by operation of law or
* international treaty, and hereby commit to the public, at large, that they
* shall not, at any time in the future, seek to enforce any copyright in this
* work against any person or entity, or prevent any person or entity from
* copying, publishing, distributing or creating derivative works of this
* work.
*/
#include <config.h>
#include <portable/system.h>
#include <errno.h>
/*
* If we're running the test suite, rename the functions to avoid conflicts
* with the system versions.
*/
#if TESTING
# undef strndup
# define strndup test_strndup
char *test_strndup(const char *, size_t);
#endif
char *
strndup(const char *s, size_t n)
{
const char *p;
size_t length;
char *copy;
if (s == NULL) {
errno = EINVAL;
return NULL;
}
/* Don't assume that the source string is nul-terminated. */
for (p = s; (size_t) (p - s) < n && *p != '\0'; p++)
;
length = p - s;
copy = malloc(length + 1);
if (copy == NULL)
return NULL;
memcpy(copy, s, length);
copy[length] = '\0';
return copy;
}
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