lib/libc/locale/wcstoimax.c

   1 /*-
   2  * Copyright (c) 1992, 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  * from @(#)strtol.c    8.1 (Berkeley) 6/4/93
  35  * $FreeBSD: head/lib/libc/locale/wcstoimax.c 227753 2011-11-20 14:45:42Z theraven $
  36  */
  37
  38
  39 #include <errno.h>
  40 #include <inttypes.h>
  41 #include <stdlib.h>
  42 #include <wchar.h>
  43 #include <wctype.h>
  44 #include "xlocale_private.h"
  45
  46 /*
  47  * Convert a wide character string to an intmax_t integer.
  48  */
  49 intmax_t
  50 wcstoimax_l(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr,
  51     int base, locale_t locale)
  52 {
  53         const wchar_t *s;
  54         uintmax_t acc;
  55         wchar_t c;
  56         uintmax_t cutoff;
  57         int neg, any, cutlim;
  58         FIX_LOCALE(locale);
  59
  60         /*
  61          * See strtoimax for comments as to the logic used.
  62          */
  63         s = nptr;
  64         do {
  65                 c = *s++;
  66         } while (iswspace_l(c, locale));
  67         if (c == L'-') {
  68                 neg = 1;
  69                 c = *s++;
  70         } else {
  71                 neg = 0;
  72                 if (c == L'+')
  73                         c = *s++;
  74         }
  75         if ((base == 0 || base == 16) &&
  76             c == L'0' && (*s == L'x' || *s == L'X')) {
  77                 c = s[1];
  78                 s += 2;
  79                 base = 16;
  80         }
  81         if (base == 0)
  82                 base = c == L'0' ? 8 : 10;
  83         acc = any = 0;
  84         if (base < 2 || base > 36)
  85                 goto noconv;
  86
  87         cutoff = neg ? (uintmax_t)-(INTMAX_MIN + INTMAX_MAX) + INTMAX_MAX
  88             : INTMAX_MAX;
  89         cutlim = cutoff % base;
  90         cutoff /= base;
  91         for ( ; ; c = *s++) {
  92 #ifdef notyet
  93                 if (iswdigit_l(c, locale))
  94                         c = digittoint_l(c, locale);
  95                 else
  96 #endif
  97                 if (c >= L'0' && c <= L'9')
  98                         c -= L'0';
  99                 else if (c >= L'A' && c <= L'Z')
 100                         c -= L'A' - 10;
 101                 else if (c >= 'a' && c <= 'z')
 102                         c -= L'a' - 10;
 103                 else
 104                         break;
 105                 if (c >= base)
 106                         break;
 107                 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
 108                         any = -1;
 109                 else {
 110                         any = 1;
 111                         acc *= base;
 112                         acc += c;
 113                 }
 114         }
 115         if (any < 0) {
 116                 acc = neg ? INTMAX_MIN : INTMAX_MAX;
 117                 errno = ERANGE;
 118         } else if (!any) {
 119 noconv:
 120                 errno = EINVAL;
 121         } else if (neg)
 122                 acc = -acc;
 123         if (endptr != NULL)
 124                 *endptr = (wchar_t *)(any ? s - 1 : nptr);
 125         return (acc);
 126 }
 127 intmax_t
 128 wcstoimax(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr,
 129     int base)
 130 {
 131         return wcstoimax_l(nptr, endptr, base, __get_locale());
 132 }