/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * Copyright (c) 2011 The FreeBSD Foundation
 *
 * Portions of this software were developed by David Chisnall
 * under sponsorship from the FreeBSD Foundation.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <errno.h>
#include <inttypes.h>
#include <stdlib.h>
#include <wchar.h>
#include <wctype.h>
#include "xlocale_private.h"

/*
 * Convert a wide character string to an intmax_t integer.
 */
intmax_t
wcstoimax_l(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr,
    int base, locale_t locale)
{
        const wchar_t *s;
        uintmax_t acc;
        wchar_t c;
        uintmax_t cutoff;
        int neg, any, cutlim;
        FIX_LOCALE(locale);

        /*
         * See strtoimax for comments as to the logic used.
         */
        s = nptr;
        do {
                c = *s++;
        } while (iswspace_l(c, locale));
        if (c == L'-') {
                neg = 1;
                c = *s++;
        } else {
                neg = 0;
                if (c == L'+')
                        c = *s++;
        }
        if ((base == 0 || base == 16) &&
            c == L'0' && (*s == L'x' || *s == L'X') &&
            ((s[1] >= L'0' && s[1] <= L'9') ||
            (s[1] >= L'A' && s[1] <= L'F') ||
            (s[1] >= L'a' && s[1] <= L'f'))) {
                c = s[1];
                s += 2;
                base = 16;
        }
        if ((base == 0 || base == 2) &&
            c == L'0' && (*s == L'b' || *s == L'B') &&
            (s[1] >= L'0' && s[1] <= L'1')) {
                c = s[1];
                s += 2;
                base = 2;
        }
        if (base == 0)
                base = c == L'0' ? 8 : 10;
        acc = any = 0;
        if (base < 2 || base > 36)
                goto noconv;

        cutoff = neg ? (uintmax_t)-(INTMAX_MIN + INTMAX_MAX) + INTMAX_MAX
            : INTMAX_MAX;
        cutlim = cutoff % base;
        cutoff /= base;
        for ( ; ; c = *s++) {
#ifdef notyet
                if (iswdigit_l(c, locale))
                        c = digittoint_l(c, locale);
                else
#endif
                if (c >= L'0' && c <= L'9')
                        c -= L'0';
                else if (c >= L'A' && c <= L'Z')
                        c -= L'A' - 10;
                else if (c >= 'a' && c <= 'z')
                        c -= L'a' - 10;
                else
                        break;
                if (c >= base)
                        break;
                if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
                        any = -1;
                else {
                        any = 1;
                        acc *= base;
                        acc += c;
                }
        }
        if (any < 0) {
                acc = neg ? INTMAX_MIN : INTMAX_MAX;
                errno = ERANGE;
        } else if (!any) {
noconv:
                errno = EINVAL;
        } else if (neg)
                acc = -acc;
        if (endptr != NULL)
                *endptr = (wchar_t *)(any ? s - 1 : nptr);
        return (acc);
}
intmax_t
wcstoimax(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr,
    int base)
{
        return wcstoimax_l(nptr, endptr, base, __get_locale());
}