rockOS/libc/string/memcmp.c

/**
 *  memcmp implementation of rockOS
 *  Copyright (C) 2022 Furkan Mudanyali
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, _either version 3 of the License, or
 *  (at your option) any later version.
 * 
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

#include <string.h>

int memcmp(const void* aptr, const void* bptr, size_t size) {
    const unsigned char* a = (const unsigned char*) aptr;
    const unsigned char* b = (const unsigned char*) bptr;
    for (size_t i = 0; i < size; i++) {
        if (a[i] < b[i]) {
            return -1;
        } else if (b[i] < a[i]) {
            return 1;
        }
    }
    return 0;
}