#include <string.h>
#include <stddef.h>

size_t strlcat(char *__restrict__ dst, const char *__restrict__ src, size_t capacity)
{
    if (!dst) { return 0; }
    if (!src) { return 0; }
    size_t used = strnlen(dst, capacity);
    if (used >= capacity) { used = capacity - 1; }
    size_t to_print = strlen(src);
    // to_print does not include the terminator
    const size_t needed = used + to_print + 1;
    if (needed > capacity) {
        to_print = capacity - used - 1;
    }
    memcpy(dst + used, src, to_print);
    *(dst + used + to_print) = '\0';
    return needed;
}

size_t strlncat(char *__restrict__ dst, const char *__restrict__ src, size_t capacity, size_t num)
{
    if (!dst) { return 0; }
    if (!src) { return 0; }
    size_t used = strnlen(dst, capacity);
    if (used >= capacity) { used = capacity - 1; }
    size_t to_print = strlen(src);
    if (to_print > num) {
        to_print = num;
    }
    // to_print does not include the terminator
    const size_t needed = used + to_print + 1;
    if (needed > capacity) {
        to_print = capacity - used - 1;
    }
    memcpy(dst + used, src, to_print);
    *(dst + used + to_print) = '\0';
    return needed;
}

size_t strlcpy(char *__restrict__ dst, const char *__restrict__ src, size_t capacity)
{
    if (!dst) { return 0; }
    if (!src) { return 0; }
    size_t to_print = strlen(src);
    // to_print does not include the terminator
    const size_t needed = to_print + 1;
    if (needed > capacity) {
        to_print = capacity - 1;
    }
    memcpy(dst, src, to_print);
    *(dst + to_print) = '\0';
    return needed;
}

size_t strlncpy(char *__restrict__ dst, const char *__restrict__ src, size_t capacity, size_t num)
{
    if (!dst) { return 0; }
    if (!src) { return 0; }
    size_t to_print = strlen(src);
    if (to_print > num) {
        to_print = num;
    }
    // to_print does not include the terminator
    const size_t needed = to_print + 1;
    if (needed > capacity) {
        to_print = capacity - 1;
    }
    memcpy(dst, src, to_print);
    *(dst + to_print) = '\0';
    return needed;
}