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' &&
  76             (*s == L'x' || *s == L'X') &&
  77             iswxdigit_l(s[1], locale))
  78         {
  79                 c = s[1];
  80                 s += 2;
  81                 base = 16;
  82         }
  83         if (base == 0)
  84                 base = c == L'0' ? 8 : 10;
  85         acc = any = 0;
  86         if (base < 2 || base > 36)
  87                 goto noconv;
  88
  89         cutoff = neg ? (unsigned long)-(LONG_MIN + LONG_MAX) + LONG_MAX
  90             : LONG_MAX;
  91         cutlim = cutoff % base;
  92         cutoff /= base;
  93         for ( ; ; c = *s++) {
  94 #ifdef notyet
  95                 if (iswdigit_l(c, locale))
  96                         c = digittoint_l(c, locale);
  97                 else
  98 #endif
  99                 if (c >= L'0' && c <= L'9')
 100                         c -= L'0';
 101                 else if (c >= L'A' && c <= L'Z')
 102                         c -= L'A' - 10;
 103                 else if (c >= L'a' && c <= L'z')
 104                         c -= L'a' - 10;
 105                 else
 106                         break;
 107                 if (c >= base)
 108                         break;
 109                 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
 110                         any = -1;
 111                 else {
 112                         any = 1;
 113                         acc *= base;
 114                         acc += c;
 115                 }
 116         }
 117         if (any < 0) {
 118                 acc = neg ? LONG_MIN : LONG_MAX;
 119                 errno = ERANGE;
 120         } else if (!any) {
 121 noconv:
 122                 errno = EINVAL;
 123         } else if (neg)
 124                 acc = -acc;
 125         if (endptr != NULL)
 126                 *endptr = (wchar_t *)(any ? s - 1 : nptr);
 127         return (acc);
 128 }
 129 long
 130 wcstol(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr, int base)
 131 {
 132         return wcstol_l(nptr, endptr, base, __get_locale());
 133 }