1#define _BSD_SOURCE
2#include <string.h>
3
4size_t strlcat(char* d, const char* s, size_t n) {
5    size_t l = strnlen(d, n);
6    if (l == n)
7        return l + strlen(s);
8    return l + strlcpy(d + l, s, n - l);
9}
10