/* Copyright (c) 2019 Dennis Wölfing
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/* libc/src/strings/strcasecmp.c
 * Case insensitive string comparison.
 */

#include <ctype.h>
#include <strings.h>

int strcasecmp(const char* str1, const char* str2) {
    const unsigned char* s1 = (const unsigned char*) str1;
    const unsigned char* s2 = (const unsigned char*) str2;

    while (*s1 || *s2) {
        unsigned char c1 = tolower(*s1);
        unsigned char c2 = tolower(*s2);

        if (c1 < c2) {
            return -1;
        } else if (c1 > c2) {
            return 1;
        }

        s1++;
        s2++;
    }

    return 0;
}
