third_party/ulib/musl/src/string/strlcat.c

#define _BSD_SOURCE
#include <string.h>

size_t strlcat(char* d, const char* s, size_t n) {
    size_t l = strnlen(d, n);
    if (l == n)
        return l + strlen(s);
    return l + strlcpy(d + l, s, n - l);
}