lib/libc/locale/_wcstoul.h

   1 /* $NetBSD: _wcstoul.h,v 1.3 2005/11/29 03:11:59 christos 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 __UINT
  47 _FUNCNAME(nptr, endptr, base)
  48         const wchar_t *nptr;
  49         wchar_t **endptr;
  50         int base;
  51 {
  52         const wchar_t *s;
  53         __UINT acc, cutoff;
  54         wint_t wc;
  55         int i;
  56         int neg, any, cutlim;
  57
  58         _DIAGASSERT(nptr != NULL);
  59         /* endptr may be NULL */
  60
  61         if (base && (base < 2 || base > 36)) {
  62                 errno = EINVAL;
  63                 return 0;
  64         }
  65
  66         /*
  67          * Skip white space and pick up leading +/- sign if any.
  68          * If base is 0, allow 0x for hex and 0 for octal, else
  69          * assume decimal; if base is already 16, allow 0x.
  70          */
  71         s = nptr;
  72         do {
  73                 wc = (wchar_t) *s++;
  74         } while (iswspace(wc));
  75         if (wc == L'-') {
  76                 neg = 1;
  77                 wc = *s++;
  78         } else {
  79                 neg = 0;
  80                 if (wc == L'+')
  81                         wc = *s++;
  82         }
  83         if ((base == 0 || base == 16) &&
  84             wc == L'0' && (*s == L'x' || *s == L'X')) {
  85                 wc = s[1];
  86                 s += 2;
  87                 base = 16;
  88         }
  89         if (base == 0)
  90                 base = wc == L'0' ? 8 : 10;
  91
  92         /*
  93          * See strtoul for comments as to the logic used.
  94          */
  95         cutoff = __UINT_MAX / (__UINT)base;
  96         cutlim = (int)(__UINT_MAX % (__UINT)base);
  97         for (acc = 0, any = 0;; wc = (wchar_t) *s++) {
  98                 i = __wctoint(wc);
  99                 if (i == (wint_t)-1)
 100                         break;
 101                 if (i >= base)
 102                         break;
 103                 if (any < 0)
 104                         continue;
 105                 if (acc > cutoff || (acc == cutoff && i > cutlim)) {
 106                         any = -1;
 107                         acc = __UINT_MAX;
 108                         errno = ERANGE;
 109                 } else {
 110                         any = 1;
 111                         acc *= (__UINT)base;
 112                         acc += i;
 113                 }
 114         }
 115         if (neg && any > 0)
 116                 acc = -acc;
 117         if (endptr != 0)
 118                 *endptr = __UNCONST(any ? s - 1 : nptr);
 119         return (acc);
 120 }