/* Copyright (c) 2019, 2022 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/stdlib/mbtowc.c
 * Convert a multi byte character to a wide character. (C89)
 */

#define mbrtowc __mbrtowc
#include <errno.h>
#include <stdlib.h>
#include <wchar.h>

int mbtowc(wchar_t* restrict wc, const char* restrict s, size_t size) {
    if (!s) return 0;
    mbstate_t ps = {0};
    size_t result = mbrtowc(wc, s, size, &ps);
    if (result == (size_t) -2) {
        errno = EILSEQ;
        return -1;
    }
    return result;
}
