StdLib/LibC/Locale/_wcstol.h

   1 /** @file
   2   Copyright (c) 2010 - 2011, 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.
   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   @(#)strtol.c 8.1 (Berkeley) 6/4/93
  40   NetBSD: wcstol.c,v 1.1 2001/09/27 16:30:36 yamt Exp
  41   Citrus: xpg4dl/FreeBSD/lib/libc/locale/wcstol.c,v 1.2 2001/09/21 16:11:41 yamt Exp
  42   NetBSD: _wcstol.h,v 1.3 2005/11/29 03:11:59 christos Exp
  43  */
  44
  45 /*
  46  * function template for wcstol, wcstoll and wcstoimax.
  47  *
  48  * parameters:
  49  *  _FUNCNAME : function name
  50  *      __wINT     : return type
  51  *      __wINT_MIN : lower limit of the return type
  52  *      __wINT_MAX : upper limit of the return type
  53  */
  54
  55 __wINT
  56 _FUNCNAME(
  57   const wchar_t *nptr,
  58   wchar_t **endptr,
  59   int base
  60   )
  61 {
  62   const wchar_t *s;
  63   __wINT 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 #ifdef __GNUC__
  72   (void)&acc; (void)&cutoff;
  73 #endif
  74
  75   /* check base value */
  76   if (base && (base < 2 || base > 36)) {
  77     errno = EINVAL;
  78     return 0;
  79   }
  80
  81   /*
  82    * Skip white space and pick up leading +/- sign if any.
  83    * If base is 0, allow 0x for hex and 0 for octal, else
  84    * assume decimal; if base is already 16, allow 0x.
  85    */
  86   s = nptr;
  87   do {
  88     wc = (wchar_t) *s++;
  89   } while (iswspace(wc));
  90   if (wc == L'-') {
  91     neg = 1;
  92     wc = *s++;
  93   } else {
  94     neg = 0;
  95     if (wc == L'+')
  96       wc = *s++;
  97   }
  98   if ((base == 0 || base == 16) &&
  99       wc == L'0' && (*s == L'x' || *s == L'X')) {
 100     wc = s[1];
 101     s += 2;
 102     base = 16;
 103   }
 104   if (base == 0)
 105     base = ((wc == L'0') ? 8 : 10);
 106
 107   /*
 108    * See strtol for comments as to the logic used.
 109    */
 110   cutoff = neg ? __wINT_MIN : __wINT_MAX;
 111   cutlim = (int)(cutoff % base);
 112   cutoff /= base;
 113   if (neg) {
 114     if (cutlim > 0) {
 115       cutlim -= base;
 116       cutoff += 1;
 117     }
 118     cutlim = -cutlim;
 119   }
 120   for (acc = 0, any = 0;; wc = (wchar_t) *s++) {
 121     i = __wctoint((wchar_t)wc);
 122     if (i == -1)
 123       break;
 124     if (i >= base)
 125       break;
 126     if (any < 0)
 127       continue;
 128     if (neg) {
 129       if (acc < cutoff || (acc == cutoff && i > cutlim)) {
 130         any = -1;
 131         acc = __wINT_MIN;
 132         errno = ERANGE;
 133       } else {
 134         any = 1;
 135         acc *= base;
 136         acc -= i;
 137       }
 138     } else {
 139       if (acc > cutoff || (acc == cutoff && i > cutlim)) {
 140         any = -1;
 141         acc = __wINT_MAX;
 142         errno = ERANGE;
 143       } else {
 144         any = 1;
 145         acc *= base;
 146         acc += i;
 147       }
 148     }
 149   }
 150   if (endptr != 0)
 151     *endptr = __UNCONST(any ? s - 1 : nptr);
 152   return (acc);
 153 }