lib/libc/locale/_wcstoul.h

   1 /* $NetBSD: _wcstoul.h,v 1.6 2013/05/17 12:55:57 joerg Exp $ */
   2
   3 /*
   4  * Copyright (c) 1990, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  * Original version ID:
  32  * @(#)strtoul.c        8.1 (Berkeley) 6/4/93
  33  * Citrus: xpg4dl/FreeBSD/lib/libc/locale/wcstoul.c,v 1.2 2001/09/21 16:11:41 yamt Exp
  34  * NetBSD: wcstoul.c,v 1.1 2001/09/27 16:30:37 yamt Exp
  35  */
  36
  37 /*
  38  * function template for wcstoul, wcstoull and wcstoumax.
  39  *
  40  * parameters:
  41  *      _FUNCNAME  : function name
  42  *      __UINT     : return type
  43  *      __UINT_MAX : upper limit of the return type
  44  */
  45
  46 #include <locale.h>
  47 #include "setlocale_local.h"
  48 #define INT_FUNCNAME_(pre, name, post)  pre ## name ## post
  49 #define INT_FUNCNAME(pre, name, post)   INT_FUNCNAME_(pre, name, post)
  50
  51 static __UINT
  52 INT_FUNCNAME(_int_, _FUNCNAME, _l)(const wchar_t *nptr, wchar_t **endptr,
  53                                    int base, locale_t loc)
  54 {
  55         const wchar_t *s;
  56         __UINT acc, cutoff;
  57         wint_t wc;
  58         int i;
  59         int neg, any, cutlim;
  60
  61         _DIAGASSERT(nptr != NULL);
  62         /* endptr may be NULL */
  63
  64         if (base && (base < 2 || base > 36)) {
  65                 errno = EINVAL;
  66                 return 0;
  67         }
  68
  69         /*
  70          * Skip white space and pick up leading +/- sign if any.
  71          * If base is 0, allow 0x for hex and 0 for octal, else
  72          * assume decimal; if base is already 16, allow 0x.
  73          */
  74         s = nptr;
  75         do {
  76                 wc = (wchar_t) *s++;
  77         } while (iswspace_l(wc, loc));
  78         if (wc == L'-') {
  79                 neg = 1;
  80                 wc = *s++;
  81         } else {
  82                 neg = 0;
  83                 if (wc == L'+')
  84                         wc = *s++;
  85         }
  86         if ((base == 0 || base == 16) &&
  87             wc == L'0' && (*s == L'x' || *s == L'X')) {
  88                 wc = s[1];
  89                 s += 2;
  90                 base = 16;
  91         }
  92         if (base == 0)
  93                 base = wc == L'0' ? 8 : 10;
  94
  95         /*
  96          * See strtoul for comments as to the logic used.
  97          */
  98         cutoff = __UINT_MAX / (__UINT)base;
  99         cutlim = (int)(__UINT_MAX % (__UINT)base);
 100         for (acc = 0, any = 0;; wc = (wchar_t) *s++) {
 101                 i = __wctoint(wc);
 102                 if (i == (wint_t)-1)
 103                         break;
 104                 if (i >= base)
 105                         break;
 106                 if (any < 0)
 107                         continue;
 108                 if (acc > cutoff || (acc == cutoff && i > cutlim)) {
 109                         any = -1;
 110                         acc = __UINT_MAX;
 111                         errno = ERANGE;
 112                 } else {
 113                         any = 1;
 114                         acc *= (__UINT)base;
 115                         acc += i;
 116                 }
 117         }
 118         if (neg && any > 0)
 119                 acc = -acc;
 120         if (endptr != 0)
 121                 *endptr = __UNCONST(any ? s - 1 : nptr);
 122         return (acc);
 123 }
 124
 125 __UINT
 126 _FUNCNAME(const wchar_t *nptr, wchar_t **endptr, int base)
 127 {
 128         return INT_FUNCNAME(_int_, _FUNCNAME, _l)(nptr, endptr, base,
 129                                                   _current_locale());
 130 }
 131
 132 __UINT
 133 INT_FUNCNAME(, _FUNCNAME, _l)(const wchar_t *nptr, wchar_t **endptr,
 134                               int base, locale_t loc)
 135 {
 136         return INT_FUNCNAME(_int_, _FUNCNAME, _l)(nptr, endptr, base, loc);
 137 }