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/*
* Replacement for a missing strlcat.
*
* Provides the same functionality as the *BSD function strlcat, originally
* developed by Todd Miller and Theo de Raadt. strlcat works similarly to
* strncat, except simpler. The result is always nul-terminated even if the
* source string is longer than the space remaining in the destination string,
* and the total space required is returned. The third argument is the total
* space available in the destination buffer, not just the amount of space
* remaining.
*
* 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>
/*
* If we're running the test suite, rename strlcat to avoid conflicts with
* the system version.
*/
#if TESTING
# undef strlcat
# define strlcat test_strlcat
size_t test_strlcat(char *, const char *, size_t);
#endif
size_t
strlcat(char *dst, const char *src, size_t size)
{
size_t used, length, copy;
used = strlen(dst);
length = strlen(src);
if (size > 0 && used < size - 1) {
copy = (length >= size - used) ? size - used - 1 : length;
memcpy(dst + used, src, copy);
dst[used + copy] = '\0';
}
return used + length;
}
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