lib/libc/locale/_wcstoul.h

   1 /* $NetBSD: src/lib/libc/locale/_wcstoul.h,v 1.2 2003/08/07 16:43:03 agc Exp $ */
   2 /* $DragonFly: src/lib/libc/locale/_wcstoul.h,v 1.1 2005/03/16 07:54:41 joerg Exp $ */
   3
   4 /*
   5  * Copyright (c) 1990, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * Original version ID:
  33  * @(#)strtoul.c        8.1 (Berkeley) 6/4/93
  34  * Citrus: xpg4dl/FreeBSD/lib/libc/locale/wcstoul.c,v 1.2 2001/09/21 16:11:41 yamt Exp
  35  * NetBSD: wcstoul.c,v 1.1 2001/09/27 16:30:37 yamt Exp
  36  */
  37
  38 /*
  39  * function template for wcstoul, wcstoull and wcstoumax.
  40  *
  41  * parameters:
  42  *      _FUNCNAME  : function name
  43  *      __UINT     : return type
  44  *      __UINT_MAX : upper limit of the return type
  45  */
  46
  47 __UINT
  48 _FUNCNAME(const wchar_t *nptr, wchar_t **endptr, int base)
  49 {
  50         const wchar_t *s;
  51         __UINT acc, cutoff;
  52         wint_t wc;
  53         int i;
  54         int neg, any, cutlim;
  55
  56         _DIAGASSERT(nptr != NULL);
  57         /* endptr may be NULL */
  58
  59         if (base && (base < 2 || base > 36)) {
  60                 errno = EINVAL;
  61                 return(0);
  62         }
  63
  64         /*
  65          * Skip white space and pick up leading +/- sign if any.
  66          * If base is 0, allow 0x for hex and 0 for octal, else
  67          * assume decimal; if base is already 16, allow 0x.
  68          */
  69         s = nptr;
  70         do {
  71                 wc = (wchar_t) *s++;
  72         } while (iswspace(wc));
  73         if (wc == L'-') {
  74                 neg = 1;
  75                 wc = *s++;
  76         } else {
  77                 neg = 0;
  78                 if (wc == L'+')
  79                         wc = *s++;
  80         }
  81         if ((base == 0 || base == 16) &&
  82             wc == L'0' && (*s == L'x' || *s == L'X')) {
  83                 wc = s[1];
  84                 s += 2;
  85                 base = 16;
  86         }
  87         if (base == 0)
  88                 base = wc == L'0' ? 8 : 10;
  89
  90         /*
  91          * See strtoul for comments as to the logic used.
  92          */
  93         cutoff = __UINT_MAX / (__UINT)base;
  94         cutlim = (int)(__UINT_MAX % (__UINT)base);
  95         for (acc = 0, any = 0;; wc = (wchar_t) *s++) {
  96                 i = __wctoint(wc);
  97                 if (i == (wint_t)-1)
  98                         break;
  99                 if (i >= base)
 100                         break;
 101                 if (any < 0)
 102                         continue;
 103                 if (acc > cutoff || (acc == cutoff && i > cutlim)) {
 104                         any = -1;
 105                         acc = __UINT_MAX;
 106                         errno = ERANGE;
 107                 } else {
 108                         any = 1;
 109                         acc *= (__UINT)base;
 110                         acc += i;
 111                 }
 112         }
 113         if (neg && any > 0)
 114                 acc = -acc;
 115         if (endptr != 0)
 116                 /* LINTED interface specification */
 117                 *endptr = (wchar_t *)(any ? s - 1 : nptr);
 118         return(acc);
 119 }