locale/FreeBSD/wcstol.c

   1 /*-
   2  * Copyright (c) 1990, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #include <sys/cdefs.h>
  31 __FBSDID("$FreeBSD: src/lib/libc/locale/wcstol.c,v 1.2 2007/01/09 00:28:01 imp Exp $");
  32
  33 #include "xlocale_private.h"
  34
  35 #include <ctype.h>
  36 #include <errno.h>
  37 #include <limits.h>
  38 #include <wchar.h>
  39 #include <wctype.h>
  40
  41 /*
  42  * Convert a string to a long integer.
  43  */
  44 long
  45 wcstol_l(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr,
  46     int base, locale_t loc)
  47 {
  48         const wchar_t *s;
  49         unsigned long acc;
  50         wchar_t c;
  51         unsigned long cutoff;
  52         int neg, any, cutlim;
  53
  54         NORMALIZE_LOCALE(loc);
  55         /*
  56          * See strtol for comments as to the logic used.
  57          */
  58         s = nptr;
  59         do {
  60                 c = *s++;
  61         } while (iswspace_l(c, loc));
  62         if (c == '-') {
  63                 neg = 1;
  64                 c = *s++;
  65         } else {
  66                 neg = 0;
  67                 if (c == L'+')
  68                         c = *s++;
  69         }
  70         if ((base == 0 || base == 16) &&
  71             c == L'0' && (*s == L'x' || *s == L'X')) {
  72                 c = s[1];
  73                 s += 2;
  74                 base = 16;
  75         }
  76         if (base == 0)
  77                 base = c == L'0' ? 8 : 10;
  78         acc = any = 0;
  79         if (base < 2 || base > 36)
  80                 goto noconv;
  81
  82         cutoff = neg ? (unsigned long)-(LONG_MIN + LONG_MAX) + LONG_MAX
  83             : LONG_MAX;
  84         cutlim = cutoff % base;
  85         cutoff /= base;
  86         for ( ; ; c = *s++) {
  87 #ifdef notyet
  88                 if (iswdigit_l(c, loc))
  89                         c = digittoint_l(c, loc);
  90                 else
  91 #endif
  92                 if (c >= L'0' && c <= L'9')
  93                         c -= L'0';
  94                 else if (c >= L'A' && c <= L'Z')
  95                         c -= L'A' - 10;
  96                 else if (c >= L'a' && c <= L'z')
  97                         c -= L'a' - 10;
  98                 else
  99                         break;
 100                 if (c >= base)
 101                         break;
 102                 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
 103                         any = -1;
 104                 else {
 105                         any = 1;
 106                         acc *= base;
 107                         acc += c;
 108                 }
 109         }
 110         if (any < 0) {
 111                 acc = neg ? LONG_MIN : LONG_MAX;
 112                 errno = ERANGE;
 113         } else if (!any) {
 114 noconv:
 115                 errno = EINVAL;
 116         } else if (neg)
 117                 acc = -acc;
 118         if (endptr != NULL)
 119                 *endptr = (wchar_t *)(any ? s - 1 : nptr);
 120         return (acc);
 121 }
 122
 123 long
 124 wcstol(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr, int base)
 125 {
 126         return wcstol_l(nptr, endptr, base, __current_locale());
 127 }