lib/libc/locale/_wcstol.h

   1 /* $NetBSD: src/lib/libc/locale/_wcstol.h,v 1.2 2003/08/07 16:43:03 agc Exp $ */
   2 /* $DragonFly: src/lib/libc/locale/_wcstol.h,v 1.1 2005/03/16 06:54:41 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  * @(#)strtol.c 8.1 (Berkeley) 6/4/93
  34  * NetBSD: wcstol.c,v 1.1 2001/09/27 16:30:36 yamt Exp
  35  * Citrus: xpg4dl/FreeBSD/lib/libc/locale/wcstol.c,v 1.2 2001/09/21 16:11:41 yamt Exp
  36  */
  37
  38 /*
  39  * function template for wcstol, wcstoll and wcstoimax.
  40  *
  41  * parameters:
  42  *      _FUNCNAME : function name
  43  *      __INT     : return type
  44  *      __INT_MIN : lower limit of the return type
  45  *      __INT_MAX : upper limit of the return type
  46  */
  47
  48 __INT
  49 _FUNCNAME(const wchar_t *nptr, wchar_t **endptr, int base)
  50 {
  51         const wchar_t *s;
  52         __INT acc, cutoff;
  53         wint_t wc;
  54         int i;
  55         int neg, any, cutlim;
  56
  57         _DIAGASSERT(nptr != NULL);
  58         /* endptr may be NULL */
  59
  60         /* check base value */
  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 strtol for comments as to the logic used.
  94          */
  95         cutoff = neg ? __INT_MIN : __INT_MAX;
  96         cutlim = (int)(cutoff % base);
  97         cutoff /= base;
  98         if (neg) {
  99                 if (cutlim > 0) {
 100                         cutlim -= base;
 101                         cutoff += 1;
 102                 }
 103                 cutlim = -cutlim;
 104         }
 105         for (acc = 0, any = 0;; wc = (wchar_t) *s++) {
 106                 i = __wctoint(wc);
 107                 if (i == -1)
 108                         break;
 109                 if (i >= base)
 110                         break;
 111                 if (any < 0)
 112                         continue;
 113                 if (neg) {
 114                         if (acc < cutoff || (acc == cutoff && i > cutlim)) {
 115                                 any = -1;
 116                                 acc = __INT_MIN;
 117                                 errno = ERANGE;
 118                         } else {
 119                                 any = 1;
 120                                 acc *= base;
 121                                 acc -= i;
 122                         }
 123                 } else {
 124                         if (acc > cutoff || (acc == cutoff && i > cutlim)) {
 125                                 any = -1;
 126                                 acc = __INT_MAX;
 127                                 errno = ERANGE;
 128                         } else {
 129                                 any = 1;
 130                                 acc *= base;
 131                                 acc += i;
 132                         }
 133                 }
 134         }
 135         if (endptr != 0)
 136                 /* LINTED interface specification */
 137                 *endptr = (wchar_t *)(any ? s - 1 : nptr);
 138         return(acc);
 139 }