locale/wcstoul-fbsd.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  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include <sys/cdefs.h>
  35 __FBSDID("$FreeBSD: src/lib/libc/locale/wcstoul.c,v 1.1 2002/09/08 13:27:26 tjr Exp $");
  36
  37 #include "xlocale_private.h"
  38
  39 #include <ctype.h>
  40 #include <errno.h>
  41 #include <limits.h>
  42 #include <wchar.h>
  43 #include <wctype.h>
  44
  45 /*
  46  * Convert a wide character string to an unsigned long integer.
  47  */
  48 unsigned long
  49 wcstoul_l(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr,
  50     int base, locale_t loc)
  51 {
  52         const wchar_t *s;
  53         unsigned long acc;
  54         wchar_t c;
  55         unsigned long cutoff;
  56         int neg, any, cutlim;
  57
  58         NORMALIZE_LOCALE(loc);
  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, loc));
  66         if (c == L'-') {
  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 = ULONG_MAX / base;
  87         cutlim = ULONG_MAX % base;
  88         for ( ; ; c = *s++) {
  89 #ifdef notyet
  90                 if (iswdigit_l(c, loc))
  91                         c = digittoint_l(c, loc);
  92                 else
  93 #endif
  94                 if (c >= L'0' && c <= L'9')
  95                         c -= L'0';
  96                 else if (c >= L'A' && c <= L'Z')
  97                         c -= L'A' - 10;
  98                 else if (c >= L'a' && c <= L'z')
  99                         c -= L'a' - 10;
 100                 else
 101                         break;
 102                 if (c >= base)
 103                         break;
 104                 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
 105                         any = -1;
 106                 else {
 107                         any = 1;
 108                         acc *= base;
 109                         acc += c;
 110                 }
 111         }
 112         if (any < 0) {
 113                 acc = ULONG_MAX;
 114                 errno = ERANGE;
 115         } else if (!any) {
 116 noconv:
 117                 errno = EINVAL;
 118         } else if (neg)
 119                 acc = -acc;
 120         if (endptr != NULL)
 121                 *endptr = (wchar_t *)(any ? s - 1 : nptr);
 122         return (acc);
 123 }
 124
 125 unsigned long
 126 wcstoul(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr, int base)
 127 {
 128         return wcstoul_l(nptr, endptr, base, __current_locale());
 129 }