StdLib/LibC/Locale/_wcstoul.h

   1 /** @file
   2   Copyright (c) 2010, Intel Corporation. All rights reserved.<BR>
   3   This program and the accompanying materials
   4   are licensed and made available under the terms and conditions of the BSD License
   5   which accompanies this distribution.  The full text of the license may be found at
   6   http://opensource.org/licenses/bsd-license.php
   7
   8   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
   9   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  10
  11   Copyright (c) 1990, 1993
  12   The Regents of the University of California.  All rights reserved.
  13
  14   Redistribution and use in source and binary forms, with or without
  15   modification, are permitted provided that the following conditions
  16   are met:
  17     1. Redistributions of source code must retain the above copyright
  18       notice, this list of conditions and the following disclaimer.
  19     2. Redistributions in binary form must reproduce the above copyright
  20       notice, this list of conditions and the following disclaimer in the
  21       documentation and/or other materials provided with the distribution.
  22     3. Neither the name of the University nor the names of its contributors
  23       may be used to endorse or promote products derived from this software
  24       without specific prior written permission.
  25
  26   THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27   ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28   IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29   ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30   FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32   OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33   HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34   LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35   OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36   SUCH DAMAGE.
  37
  38   Original version ID:
  39   @(#)strtoul.c  8.1 (Berkeley) 6/4/93
  40   Citrus: xpg4dl/FreeBSD/lib/libc/locale/wcstoul.c,v 1.2 2001/09/21 16:11:41 yamt Exp
  41   NetBSD: wcstoul.c,v 1.1 2001/09/27 16:30:37 yamt Exp
  42   NetBSD: _wcstoul.h,v 1.3 2005/11/29 03:11:59 christos Exp
  43  */
  44
  45 /*
  46  * function template for wcstoul, wcstoull and wcstoumax.
  47  *
  48  * parameters:
  49  *  _FUNCNAME  : function name
  50  *      __wUINT     : return type
  51  *      __wINT      : signed version of __wUINT
  52  *      __wUINT_MAX : upper limit of the return type
  53  */
  54
  55 __wUINT
  56 _FUNCNAME(
  57   const wchar_t *nptr,
  58   wchar_t **endptr,
  59   int base
  60   )
  61 {
  62   const wchar_t *s;
  63   __wUINT acc, cutoff;
  64   wint_t wc;
  65   int i;
  66   int neg, any, cutlim;
  67
  68   _DIAGASSERT(nptr != NULL);
  69   /* endptr may be NULL */
  70
  71   if (base && (base < 2 || base > 36)) {
  72     errno = EINVAL;
  73     return 0;
  74   }
  75
  76   /*
  77    * Skip white space and pick up leading +/- sign if any.
  78    * If base is 0, allow 0x for hex and 0 for octal, else
  79    * assume decimal; if base is already 16, allow 0x.
  80    */
  81   s = nptr;
  82   do {
  83     wc = (wchar_t) *s++;
  84   } while (iswspace(wc));
  85   if (wc == L'-') {
  86     neg = 1;
  87     wc = *s++;
  88   } else {
  89     neg = 0;
  90     if (wc == L'+')
  91       wc = *s++;
  92   }
  93   if ((base == 0 || base == 16) &&
  94       wc == L'0' && (*s == L'x' || *s == L'X')) {
  95     wc = s[1];
  96     s += 2;
  97     base = 16;
  98   }
  99   if (base == 0)
 100     base = wc == L'0' ? 8 : 10;
 101
 102   /*
 103    * See strtoul for comments as to the logic used.
 104    */
 105   cutoff = __wUINT_MAX / (__wUINT)base;
 106   cutlim = (int)(__wUINT_MAX % (__wUINT)base);
 107   for (acc = 0, any = 0;; wc = (wint_t) *s++) {
 108     i = __wctoint((wchar_t)wc);
 109     if (i == -1) {
 110       break;
 111     }
 112     if (i >= base)
 113       break;
 114     if (any < 0)
 115       continue;
 116     if (acc > cutoff || (acc == cutoff && i > cutlim)) {
 117       any = -1;
 118       acc = __wUINT_MAX;
 119       errno = ERANGE;
 120     } else {
 121       any = 1;
 122       acc *= (__wUINT)base;
 123       acc += i;
 124     }
 125   }
 126   if (neg && any > 0)
 127     acc = (__wUINT)(-((__wINT)acc));
 128   if (endptr != 0)
 129     *endptr = __UNCONST(any ? s - 1 : nptr);
 130   return (acc);
 131 }