/*-

 * Copyright (c) 1990, 1993

 *	The Regents of the University of California.  All rights reserved.

 *

 * 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.

 * 4. 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 <sys/cdefs.h>

__FBSDID("$FreeBSD: src/lib/libc/locale/wcstol.c,v 1.1 2002/09/08 13:27:26 tjr Exp $");

#include <ctype.h>

#include <errno.h>

#include <limits.h>

#include <wchar.h>

#include <wctype.h>

/*

 * Convert a string to a long integer.

 */

EXPORT_C long

wcstol(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr, int base)

{

	const wchar_t *s;

	unsigned long acc;

	wchar_t c;

	unsigned long cutoff;

	int neg, any, cutlim;

	/*

	 * See strtol for comments as to the logic used.

	 */

	s = nptr;

	do {

		c = *s++;

	} while (iswspace(c));

	if (c == '-') {

		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')) {

		c = s[1];

		s += 2;

		base = 16;

	}

	if (base == 0)

		base = c == L'0' ? 8 : 10;

	acc = any = 0;

	if (base < 2 || base > 36)

		goto noconv;

	cutoff = neg ? (unsigned long)-(LONG_MIN + LONG_MAX) + LONG_MAX

	    : LONG_MAX;

	cutlim = cutoff % base;

	cutoff /= base;

	for ( ; ; c = *s++) {

#ifdef notyet

		if (iswdigit(c))

			c = digittoint(c);

		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 >= L'a' && c <= L'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 ? LONG_MIN : LONG_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);

}