/*
 * Copyright 2025, Haiku, Inc. All rights reserved.
 * Copyright 2008, Axel Dörfler, axeld@pinc-software.de.
 * Distributed under the terms of the MIT license.
 */


#include <stdint.h>
#include <string.h>
#undef memcmp


#define MISALIGNMENT(PTR, TYPE) ((addr_t)(PTR) & (sizeof(TYPE) - 1))

int
memcmp(const void *_a, const void *_b, size_t count)
{
        const unsigned char *a = (const unsigned char *)_a;
        const unsigned char *b = (const unsigned char *)_b;

        if (MISALIGNMENT(a, size_t) == 0 && MISALIGNMENT(b, size_t) == 0) {
                size_t *asz = (size_t *)a;
                size_t *bsz = (size_t *)b;

                while (count >= sizeof(size_t) && *asz == *bsz) {
                        asz++;
                        bsz++;
                        count -= sizeof(size_t);
                }
                a = (const unsigned char *)asz;
                b = (const unsigned char *)bsz;
        }

        while (count > 0 && *a == *b) {
                a++;
                b++;
                count--;
        }

        if (count == 0)
                return 0;

        return *a - *b;
}