#include <klibc/string.h>
#include <lunaix/types.h>

void* weak
memcpy(void* dest, const void* src, unsigned long num)
{
    for (size_t i = 0; i < num; i++) {
        ((u8_t*)dest)[i] = ((u8_t*)src)[i];
    }

    return dest;
}

void* weak
memmove(void* dest, const void* src, unsigned long num)
{
    u8_t* dest_ptr = (u8_t*)dest;
    const u8_t* src_ptr = (const u8_t*)src;
    if (dest_ptr < src_ptr) {
        for (unsigned long i = 0; i < num; i++) {
            *(dest_ptr + i) = *(src_ptr + i);
        }
    } else {
        for (unsigned long i = num; i != 0; i--) {
            *(dest_ptr + i - 1) = *(src_ptr + i - 1);
        }
    }
    return dest;
}

void* weak
memset(void* ptr, int value, unsigned long num)
{
    for (size_t i = 0; i < num; i++) {
        ((u8_t*)ptr)[i] = 0;
    }

    return ptr;
}

int weak
memcmp(const void* ptr1, const void* ptr2, unsigned long num)
{
    u8_t* p1 = (u8_t*)ptr1;
    u8_t* p2 = (u8_t*)ptr2;
    for (unsigned long i = 0; i < num; i++) {
        int diff = *(p1 + i) - *(p2 + i);
        if (diff != 0) {
            return diff;
        }
    }
    return 0;
}