/*-
 * 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.
 * 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.
 *
 * Original version ID:
 * NetBSD: src/lib/libc/locale/_wcstoul.h,v 1.2 2003/08/07 16:43:03 agc Exp
 */

#include "dcmtk/config/osconfig.h"

/*
 * function template for strtoul, strtoull and strtoumax.
 *
 * parameters:
 *  _FUNCNAME  : function name
 *      __UINT     : return type
 *      UINT_MAX : upper limit of the return type
 */

__UINT
_FUNCNAME(const char *nptr, char **endptr, int base)
{
    const char *s;
    __UINT acc, cutoff;
    unsigned char c;
    int any, cutlim, i, neg;

    /* check base value */
    if (base && (base < 2 || base > 36)) {
#if !defined(_KERNEL) && !defined(_STANDALONE)
        errno = EINVAL;
        return (0);
#else
        panic("%s: invalid base %d", __func__, base);
#endif
    }

    /*
     * Skip white space and pick up leading +/- sign if any.
     * If base is 0, allow 0x for hex and 0 for octal, else
     * assume decimal; if base is already 16, allow 0x.
     */
    s = nptr;
    do {
        c = *s++;
    } while (isspace(c));
    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);

    /*
     * See strtol for comments as to the logic used.
     */
    cutoff = UINT_MAX / (__UINT)base;
    cutlim = (int)(UINT_MAX % (__UINT)base);
    for (acc = 0, any = 0;; c = *s++) {
        if (isdigit(c))
            i = c - '0';
        else if (isalpha(c))
            i = c - (isupper(c) ? 'A' - 10 : 'a' - 10);
        else
            break;
        if (i >= base)
            break;
        if (any < 0)
            continue;
        if (acc > cutoff || (acc == cutoff && i > cutlim)) {
            acc = UINT_MAX;
#if !defined(_KERNEL) && !defined(_STANDALONE)
            any = -1;
            errno = ERANGE;
#else
            any = 0;
            break;
#endif
        } else {
            any = 1;
            acc *= (__UINT)base;
            acc += i;
        }
    }

/* suppress MSVC 'unary minus operator applied to unsigned type' warning  */
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable: 4146)
#endif

    if (neg && any > 0)
        acc = -acc;

#ifdef _MSC_VER
#pragma warning(pop)
#endif

    if (endptr != NULL)
        /* LINTED interface specification */
        *endptr = CITRUS_DECONST(void *, any ? s - 1 : nptr);
    return (acc);
}