lib/libc/locale/_wcstol.h

   1 /* $NetBSD: _wcstol.h,v 1.2 2003/08/07 16:43:03 agc 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 __INT
  48 _FUNCNAME(nptr, endptr, base)
  49         const wchar_t *nptr;
  50         wchar_t **endptr;
  51         int base;
  52 {
  53         const wchar_t *s;
  54         __INT acc, cutoff;
  55         wint_t wc;
  56         int i;
  57         int neg, any, cutlim;
  58
  59         _DIAGASSERT(nptr != NULL);
  60         /* endptr may be NULL */
  61
  62 #ifdef __GNUC__
  63         (void)&acc; (void)&cutoff;
  64 #endif
  65
  66         /* check base value */
  67         if (base && (base < 2 || base > 36)) {
  68                 errno = EINVAL;
  69                 return 0;
  70         }
  71
  72         /*
  73          * Skip white space and pick up leading +/- sign if any.
  74          * If base is 0, allow 0x for hex and 0 for octal, else
  75          * assume decimal; if base is already 16, allow 0x.
  76          */
  77         s = nptr;
  78         do {
  79                 wc = (wchar_t) *s++;
  80         } while (iswspace(wc));
  81         if (wc == L'-') {
  82                 neg = 1;
  83                 wc = *s++;
  84         } else {
  85                 neg = 0;
  86                 if (wc == L'+')
  87                         wc = *s++;
  88         }
  89         if ((base == 0 || base == 16) &&
  90             wc == L'0' && (*s == L'x' || *s == L'X')) {
  91                 wc = s[1];
  92                 s += 2;
  93                 base = 16;
  94         }
  95         if (base == 0)
  96                 base = wc == L'0' ? 8 : 10;
  97
  98         /*
  99          * See strtol for comments as to the logic used.
 100          */
 101         cutoff = neg ? __INT_MIN : __INT_MAX;
 102         cutlim = (int)(cutoff % base);
 103         cutoff /= base;
 104         if (neg) {
 105                 if (cutlim > 0) {
 106                         cutlim -= base;
 107                         cutoff += 1;
 108                 }
 109                 cutlim = -cutlim;
 110         }
 111         for (acc = 0, any = 0;; wc = (wchar_t) *s++) {
 112                 i = __wctoint(wc);
 113                 if (i == -1)
 114                         break;
 115                 if (i >= base)
 116                         break;
 117                 if (any < 0)
 118                         continue;
 119                 if (neg) {
 120                         if (acc < cutoff || (acc == cutoff && i > cutlim)) {
 121                                 any = -1;
 122                                 acc = __INT_MIN;
 123                                 errno = ERANGE;
 124                         } else {
 125                                 any = 1;
 126                                 acc *= base;
 127                                 acc -= i;
 128                         }
 129                 } else {
 130                         if (acc > cutoff || (acc == cutoff && i > cutlim)) {
 131                                 any = -1;
 132                                 acc = __INT_MAX;
 133                                 errno = ERANGE;
 134                         } else {
 135                                 any = 1;
 136                                 acc *= base;
 137                                 acc += i;
 138                         }
 139                 }
 140         }
 141         if (endptr != 0)
 142                 *endptr = __UNCONST(any ? s - 1 : nptr);
 143         return (acc);
 144 }