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/* $OpenBSD: _wcstoul.h,v 1.3 2015/10/01 02:32:07 guenther Exp $ */
/* $NetBSD: _wcstoul.h,v 1.2 2003/08/07 16:43:03 agc Exp $ */
/*
* 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:
* @(#)strtoul.c 8.1 (Berkeley) 6/4/93
* Citrus: xpg4dl/FreeBSD/lib/libc/locale/wcstoul.c,v 1.2 2001/09/21 16:11:41 yamt Exp
* NetBSD: wcstoul.c,v 1.1 2001/09/27 16:30:37 yamt Exp
*/
/*
* function template for wcstoul, wcstoull and wcstoumax.
*
* parameters:
* FUNCNAME : function name
* uint_type : return type
* MAX_VALUE : upper limit of the return type
*/
uint_type
FUNCNAME(const wchar_t *nptr, wchar_t **endptr, int base)
{
const wchar_t *s;
uint_type acc, cutoff;
wint_t wc;
int i;
int neg, any, cutlim;
if (base && (base < 2 || base > 36)) {
errno = EINVAL;
return 0;
}
/*
* 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 {
wc = (wchar_t) *s++;
} while (iswspace(wc));
if (wc == L'-') {
neg = 1;
wc = *s++;
} else {
neg = 0;
if (wc == L'+')
wc = *s++;
}
if ((base == 0 || base == 16) &&
wc == L'0' && (*s == L'x' || *s == L'X')) {
wc = s[1];
s += 2;
base = 16;
}
if (base == 0)
base = wc == L'0' ? 8 : 10;
/*
* See strtoul for comments as to the logic used.
*/
cutoff = MAX_VALUE / (uint_type)base;
cutlim = (int)(MAX_VALUE % (uint_type)base);
for (acc = 0, any = 0;; wc = (wchar_t) *s++) {
i = wctoint(wc);
if (i == (wint_t)-1)
break;
if (i >= base)
break;
if (any < 0)
continue;
if (acc > cutoff || (acc == cutoff && i > cutlim)) {
any = -1;
acc = MAX_VALUE;
errno = ERANGE;
} else {
any = 1;
acc *= (uint_type)base;
acc += i;
}
}
if (neg && any > 0)
acc = -acc;
if (endptr != 0)
*endptr = (wchar_t *)(any ? s - 1 : nptr);
return (acc);
}
DEF_STRONG(FUNCNAME);
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