141 lines
4.6 KiB
C
141 lines
4.6 KiB
C
/*
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This code is based on strtoul.c which has the following copyright.
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It is used to convert a wide string into a signed long long.
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long long _wcstoll_r (struct _reent *rptr, const wchar_t *s,
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wchar_t **ptr, int base);
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*/
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/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* 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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#ifdef __GNUC__
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#define _GNU_SOURCE
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#include <_ansi.h>
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#include <limits.h>
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#include <wctype.h>
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#include <errno.h>
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#include <wchar.h>
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#include <reent.h>
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/*
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* Convert a wide string to a long long integer.
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*
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* Ignores `locale' stuff. Assumes that the upper and lower case
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* alphabets and digits are each contiguous.
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*/
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long long
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_DEFUN (_wcstoll_r, (rptr, nptr, endptr, base),
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struct _reent *rptr _AND
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_CONST wchar_t *nptr _AND
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wchar_t **endptr _AND
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int base)
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{
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register const wchar_t *s = nptr;
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register unsigned long long acc;
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register int c;
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register unsigned long long cutoff;
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register int neg = 0, any, cutlim;
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/*
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* Skip white space and pick up leading +/- sign if any.
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* If base is 0, allow 0x for hex and 0 for octal, else
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* assume decimal; if base is already 16, allow 0x.
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*/
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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 if (c == L'+')
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c = *s++;
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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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/*
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* Compute the cutoff value between legal numbers and illegal
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* numbers. That is the largest legal value, divided by the
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* base. An input number that is greater than this value, if
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* followed by a legal input character, is too big. One that
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* is equal to this value may be valid or not; the limit
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* between valid and invalid numbers is then based on the last
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* digit. For instance, if the range for longs is
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* [-2147483648..2147483647] and the input base is 10,
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* cutoff will be set to 214748364 and cutlim to either
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* 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated
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* a value > 214748364, or equal but the next digit is > 7 (or 8),
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* the number is too big, and we will return a range error.
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*
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* Set any if any `digits' consumed; make it negative to indicate
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* overflow.
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*/
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cutoff = neg ? -(unsigned long long)LONG_LONG_MIN : LONG_LONG_MAX;
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cutlim = cutoff % (unsigned long long)base;
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cutoff /= (unsigned long long)base;
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for (acc = 0, any = 0;; c = *s++) {
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if (iswdigit(c))
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c -= L'0';
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else if (iswalpha(c))
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c -= iswupper(c) ? L'A' - 10 : 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 = neg ? LONG_LONG_MIN : LONG_LONG_MAX;
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rptr->_errno = ERANGE;
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} else if (neg)
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acc = -acc;
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if (endptr != 0)
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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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#endif /* __GNUC__ */
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