Function strncat

freebsd/libkern/strncat.c:45–63

* Concatenate src on the end of dst. At most strlen(dst)+n+1 bytes * are written at dst (at most n+1 bytes being appended). Return dst. */

 * are written at dst (at most n+1 bytes being appended).  Return dst.
 */
char *
strncat(char *dst, const char *src, size_t n)
{

	if (n != 0) {
		char *d = dst;
		const char *s = src;

		while (*d != 0)
			d++;
		do {
			if ((*d = *s++) == '\0')
				break;
			d++;
		} while (--n != 0);
		*d = '\0';
	}
	return (dst);
}