lib/libc/locale/_wcstol.h

   1 /* $NetBSD: _wcstol.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  * @(#)strtol.c 8.1 (Berkeley) 6/4/93
  33  * NetBSD: wcstol.c,v 1.1 2001/09/27 16:30:36 yamt Exp
  34  * Citrus: xpg4dl/FreeBSD/lib/libc/locale/wcstol.c,v 1.2 2001/09/21 16:11:41 yamt Exp
  35  */
  36
  37 /*
  38  * function template for wcstol, wcstoll and wcstoimax.
  39  *
  40  * parameters:
  41  *      _FUNCNAME : function name
  42  *      __INT     : return type
  43  *      __INT_MIN : lower limit of the return type
  44  *      __INT_MAX : upper limit of the return type
  45  */
  46
  47 #include <locale.h>
  48 #include "setlocale_local.h"
  49 #define INT_FUNCNAME_(pre, name, post)  pre ## name ## post
  50 #define INT_FUNCNAME(pre, name, post)   INT_FUNCNAME_(pre, name, post)
  51
  52 static __INT
  53 INT_FUNCNAME(_int_, _FUNCNAME, _l)(const wchar_t *nptr, wchar_t **endptr,
  54                                    int base, locale_t loc)
  55 {
  56         const wchar_t *s;
  57         __INT acc, cutoff;
  58         wint_t wc;
  59         int i;
  60         int neg, any, cutlim;
  61
  62         _DIAGASSERT(nptr != NULL);
  63         /* endptr may be NULL */
  64
  65 #ifdef __GNUC__
  66         (void)&acc; (void)&cutoff;
  67 #endif
  68
  69         /* check base value */
  70         if (base && (base < 2 || base > 36)) {
  71                 errno = EINVAL;
  72                 return 0;
  73         }
  74
  75         /*
  76          * Skip white space and pick up leading +/- sign if any.
  77          * If base is 0, allow 0x for hex and 0 for octal, else
  78          * assume decimal; if base is already 16, allow 0x.
  79          */
  80         s = nptr;
  81         do {
  82                 wc = (wchar_t) *s++;
  83         } while (iswspace_l(wc, loc));
  84         if (wc == L'-') {
  85                 neg = 1;
  86                 wc = *s++;
  87         } else {
  88                 neg = 0;
  89                 if (wc == L'+')
  90                         wc = *s++;
  91         }
  92         if ((base == 0 || base == 16) &&
  93             wc == L'0' && (*s == L'x' || *s == L'X')) {
  94                 wc = s[1];
  95                 s += 2;
  96                 base = 16;
  97         }
  98         if (base == 0)
  99                 base = wc == L'0' ? 8 : 10;
 100
 101         /*
 102          * See strtol for comments as to the logic used.
 103          */
 104         cutoff = neg ? __INT_MIN : __INT_MAX;
 105         cutlim = (int)(cutoff % base);
 106         cutoff /= base;
 107         if (neg) {
 108                 if (cutlim > 0) {
 109                         cutlim -= base;
 110                         cutoff += 1;
 111                 }
 112                 cutlim = -cutlim;
 113         }
 114         for (acc = 0, any = 0;; wc = (wchar_t) *s++) {
 115                 i = __wctoint(wc);
 116                 if (i == -1)
 117                         break;
 118                 if (i >= base)
 119                         break;
 120                 if (any < 0)
 121                         continue;
 122                 if (neg) {
 123                         if (acc < cutoff || (acc == cutoff && i > cutlim)) {
 124                                 any = -1;
 125                                 acc = __INT_MIN;
 126                                 errno = ERANGE;
 127                         } else {
 128                                 any = 1;
 129                                 acc *= base;
 130                                 acc -= i;
 131                         }
 132                 } else {
 133                         if (acc > cutoff || (acc == cutoff && i > cutlim)) {
 134                                 any = -1;
 135                                 acc = __INT_MAX;
 136                                 errno = ERANGE;
 137                         } else {
 138                                 any = 1;
 139                                 acc *= base;
 140                                 acc += i;
 141                         }
 142                 }
 143         }
 144         if (endptr != 0)
 145                 *endptr = __UNCONST(any ? s - 1 : nptr);
 146         return (acc);
 147 }
 148
 149 __INT
 150 _FUNCNAME(const wchar_t *nptr, wchar_t **endptr, int base)
 151 {
 152         return INT_FUNCNAME(_int_, _FUNCNAME, _l)(nptr, endptr, base,
 153                                                   _current_locale());
 154 }
 155
 156 __INT
 157 INT_FUNCNAME(, _FUNCNAME, _l)(const wchar_t *nptr, wchar_t **endptr,
 158                               int base, locale_t loc)
 159 {
 160         return INT_FUNCNAME(_int_, _FUNCNAME, _l)(nptr, endptr, base, loc);
 161 }