source: trunk/libs/newlib/src/newlib/libc/stdlib/strtoumax.c @ 471

/*-
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * Copyright (c) 2011 The FreeBSD Foundation
 * All rights reserved.
 * 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.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "from @(#)strtoul.c      8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: head/lib/libc/stdlib/strtoumax.c 251672 2013-06-13 00:19:30Z emaste $");

#include <ctype.h>
#include <errno.h>
#include <stdlib.h>
#include <inttypes.h>
#include <stdint.h>
#include <reent.h>
#include "../locale/setlocale.h"

/*
 * Convert a string to a uintmax_t integer.
 *
 * Assumes that the upper and lower case
 * alphabets and digits are each contiguous.
 */

/*
 *Reentrant version of strtoumax.
 */
static uintmax_t
_strtoumax_l(struct _reent *rptr, const char * __restrict nptr,
             char ** __restrict endptr, int base, locale_t loc)
{
        const char *s = (const unsigned char *)nptr;
        uintmax_t acc;
        char c;
        uintmax_t cutoff;
        int neg = 0, any, cutlim;

        /*
         * See strtoimax for comments as to the logic used.
         */
        do {
                c = *s++;
        } while (isspace_l(c, loc));
        if (c == '-') {
                neg = 1;
                c = *s++;
        } else {
                neg = 0;
                if (c == '+')
                        c = *s++;
        }
        if ((base == 0 || base == 16) &&
            c == '0' && (*s == 'x' || *s == 'X')) {
                c = s[1];
                s += 2;
                base = 16;
        }
        if (base == 0)
                base = c == '0' ? 8 : 10;
        acc = any = 0;
        if (base < 2 || base > 36)
                goto noconv;

        cutoff = UINTMAX_MAX / base;
        cutlim = UINTMAX_MAX % base;
        for ( ; ; c = *s++) {
                if (c >= '0' && c <= '9')
                        c -= '0';
                else if (c >= 'A' && c <= 'Z')
                        c -= 'A' - 10;
                else if (c >= 'a' && c <= 'z')
                        c -= '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 = UINTMAX_MAX;
                rptr->_errno = ERANGE;
        } else if (!any) {
noconv:
                rptr->_errno = EINVAL;
        } else if (neg)
                acc = -acc;
        if (endptr != NULL)
                *endptr = (char *)(any ? s - 1 : nptr);
        return (acc);
}

uintmax_t
_strtoumax_r(struct _reent *rptr, const char *__restrict nptr,
             char **__restrict endptr, int base)
{
        return _strtoumax_l(rptr, nptr, endptr, base, __get_current_locale());
}

#ifndef _REENT_ONLY

uintmax_t
strtoumax_l(const char * __restrict nptr, char ** __restrict endptr, int base,
            locale_t loc)
{
        return _strtoumax_l(_REENT, nptr, endptr, base, loc);
}

uintmax_t
strtoumax(const char* __restrict nptr, char** __restrict endptr, int base)
{
        return _strtoumax_l(_REENT, nptr, endptr, base, __get_current_locale());
}

#endif