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