lib/libc/locale/wcstol.c

   1 /*-
   2  * Copyright (c) 1990, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Copyright (c) 2011 The FreeBSD Foundation
   6  * All rights reserved.
   7  * Portions of this software were developed by David Chisnall
   8  * under sponsorship from the FreeBSD Foundation.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $FreeBSD: head/lib/libc/locale/wcstol.c 227753 2011-11-20 14:45:42Z theraven $
  35  */
  36
  37
  38 #include <ctype.h>
  39 #include <errno.h>
  40 #include <limits.h>
  41 #include <wchar.h>
  42 #include <wctype.h>
  43 #include "xlocale_private.h"
  44
  45 /*
  46  * Convert a string to a long integer.
  47  */
  48 long
  49 wcstol_l(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr, int
  50                 base, locale_t locale)
  51 {
  52         const wchar_t *s;
  53         unsigned long acc;
  54         wchar_t c;
  55         unsigned long cutoff;
  56         int neg, any, cutlim;
  57         FIX_LOCALE(locale);
  58
  59         /*
  60          * See strtol for comments as to the logic used.
  61          */
  62         s = nptr;
  63         do {
  64                 c = *s++;
  65         } while (iswspace_l(c, locale));
  66         if (c == '-') {
  67                 neg = 1;
  68                 c = *s++;
  69         } else {
  70                 neg = 0;
  71                 if (c == L'+')
  72                         c = *s++;
  73         }
  74         if ((base == 0 || base == 16) &&
  75             c == L'0' && (*s == L'x' || *s == L'X')) {
  76                 c = s[1];
  77                 s += 2;
  78                 base = 16;
  79         }
  80         if (base == 0)
  81                 base = c == L'0' ? 8 : 10;
  82         acc = any = 0;
  83         if (base < 2 || base > 36)
  84                 goto noconv;
  85
  86         cutoff = neg ? (unsigned long)-(LONG_MIN + LONG_MAX) + LONG_MAX
  87             : LONG_MAX;
  88         cutlim = cutoff % base;
  89         cutoff /= base;
  90         for ( ; ; c = *s++) {
  91 #ifdef notyet
  92                 if (iswdigit_l(c, locale))
  93                         c = digittoint_l(c, locale);
  94                 else
  95 #endif
  96                 if (c >= L'0' && c <= L'9')
  97                         c -= L'0';
  98                 else if (c >= L'A' && c <= L'Z')
  99                         c -= L'A' - 10;
 100                 else if (c >= L'a' && c <= L'z')
 101                         c -= L'a' - 10;
 102                 else
 103                         break;
 104                 if (c >= base)
 105                         break;
 106                 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
 107                         any = -1;
 108                 else {
 109                         any = 1;
 110                         acc *= base;
 111                         acc += c;
 112                 }
 113         }
 114         if (any < 0) {
 115                 acc = neg ? LONG_MIN : LONG_MAX;
 116                 errno = ERANGE;
 117         } else if (!any) {
 118 noconv:
 119                 errno = EINVAL;
 120         } else if (neg)
 121                 acc = -acc;
 122         if (endptr != NULL)
 123                 *endptr = (wchar_t *)(any ? s - 1 : nptr);
 124         return (acc);
 125 }
 126 long
 127 wcstol(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr, int base)
 128 {
 129         return wcstol_l(nptr, endptr, base, __get_locale());
 130 }