120 lines
3.3 KiB
C
120 lines
3.3 KiB
C
/*
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <ctype.h>
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#include <errno.h>
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#include <limits.h>
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#include <wchar.h>
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#include <wctype.h>
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/*
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* Convert a wide character string to an unsigned long integer.
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*/
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unsigned long
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wcstoul(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr, int base)
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{
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const wchar_t *s;
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unsigned long acc;
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wchar_t c;
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unsigned long cutoff;
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int neg, any, cutlim;
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/*
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* See strtol for comments as to the logic used.
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*/
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s = nptr;
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do {
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c = *s++;
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} while (iswspace(c));
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if (c == L'-') {
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neg = 1;
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c = *s++;
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} else {
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neg = 0;
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if (c == L'+')
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c = *s++;
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}
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if ((base == 0 || base == 16) &&
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c == L'0' && (*s == L'x' || *s == L'X')) {
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c = s[1];
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s += 2;
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base = 16;
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}
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if (base == 0)
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base = c == L'0' ? 8 : 10;
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acc = any = 0;
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if (base < 2 || base > 36)
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goto noconv;
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cutoff = ULONG_MAX / base;
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cutlim = ULONG_MAX % base;
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for ( ; ; c = *s++) {
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#ifdef notyet
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if (iswdigit(c))
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c = digittoint(c);
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else
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#endif
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if (c >= L'0' && c <= L'9')
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c -= L'0';
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else if (c >= L'A' && c <= L'Z')
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c -= L'A' - 10;
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else if (c >= L'a' && c <= L'z')
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c -= L'a' - 10;
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else
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break;
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if (c >= base)
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break;
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if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
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any = -1;
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else {
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any = 1;
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acc *= base;
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acc += c;
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}
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}
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if (any < 0) {
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acc = ULONG_MAX;
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errno = ERANGE;
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} else if (!any) {
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noconv:
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errno = EINVAL;
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} else if (neg)
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acc = -acc;
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if (endptr != NULL)
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*endptr = (wchar_t *)(any ? s - 1 : nptr);
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return (acc);
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}
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