locale/FreeBSD/wcstoul.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 <ctype.h>
  38 #include <errno.h>
  39 #include <limits.h>
  40 #include <wchar.h>
  41 #include <wctype.h>
  42
  43 /*
  44  * Convert a wide character string to an unsigned long integer.
  45  */
  46 unsigned long
  47 wcstoul(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr, int base)
  48 {
  49         const wchar_t *s;
  50         unsigned long acc;
  51         wchar_t c;
  52         unsigned long cutoff;
  53         int neg, any, cutlim;
  54
  55         /*
  56          * See strtol for comments as to the logic used.
  57          */
  58         s = nptr;
  59         do {
  60                 c = *s++;
  61         } while (iswspace(c));
  62         if (c == L'-') {
  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 = ULONG_MAX / base;
  83         cutlim = ULONG_MAX % base;
  84         for ( ; ; c = *s++) {
  85 #ifdef notyet
  86                 if (iswdigit(c))
  87                         c = digittoint(c);
  88                 else
  89 #endif
  90                 if (c >= L'0' && c <= L'9')
  91                         c -= L'0';
  92                 else if (c >= L'A' && c <= L'Z')
  93                         c -= L'A' - 10;
  94                 else if (c >= L'a' && c <= L'z')
  95                         c -= L'a' - 10;
  96                 else
  97                         break;
  98                 if (c >= base)
  99                         break;
 100                 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
 101                         any = -1;
 102                 else {
 103                         any = 1;
 104                         acc *= base;
 105                         acc += c;
 106                 }
 107         }
 108         if (any < 0) {
 109                 acc = ULONG_MAX;
 110                 errno = ERANGE;
 111         } else if (!any) {
 112 noconv:
 113                 errno = EINVAL;
 114         } else if (neg)
 115                 acc = -acc;
 116         if (endptr != NULL)
 117                 *endptr = (wchar_t *)(any ? s - 1 : nptr);
 118         return (acc);
 119 }