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FreeBSD/Linux Kernel Cross Reference
sys/locale/wcstoull.c

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    1 /*-
    2  * Copyright (c) 1992, 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  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  */
   29 
   30 #include <sys/cdefs.h>
   31 #if 0
   32 #if defined(LIBC_SCCS) && !defined(lint)
   33 static char sccsid[] = "@(#)strtouq.c   8.1 (Berkeley) 6/4/93";
   34 #endif /* LIBC_SCCS and not lint */
   35 __FBSDID("FreeBSD: src/lib/libc/stdlib/strtoull.c,v 1.18 2002/09/06 11:23:59 tjr Exp ");
   36 #endif
   37 __FBSDID("$FreeBSD: stable/8/lib/libc/locale/wcstoull.c 165903 2007-01-09 00:28:16Z imp $");
   38 
   39 #include <errno.h>
   40 #include <limits.h>
   41 #include <stdlib.h>
   42 #include <wchar.h>
   43 #include <wctype.h>
   44 
   45 /*
   46  * Convert a wide character string to an unsigned long long integer.
   47  */
   48 unsigned long long
   49 wcstoull(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr,
   50     int base)
   51 {
   52         const wchar_t *s;
   53         unsigned long long acc;
   54         wchar_t c;
   55         unsigned long long cutoff;
   56         int neg, any, cutlim;
   57 
   58         /*
   59          * See strtoull for comments as to the logic used.
   60          */
   61         s = nptr;
   62         do {
   63                 c = *s++;
   64         } while (iswspace(c));
   65         if (c == L'-') {
   66                 neg = 1;
   67                 c = *s++;
   68         } else {
   69                 neg = 0;
   70                 if (c == L'+')
   71                         c = *s++;
   72         }
   73         if ((base == 0 || base == 16) &&
   74             c == L'' && (*s == L'x' || *s == L'X')) {
   75                 c = s[1];
   76                 s += 2;
   77                 base = 16;
   78         }
   79         if (base == 0)
   80                 base = c == L'' ? 8 : 10;
   81         acc = any = 0;
   82         if (base < 2 || base > 36)
   83                 goto noconv;
   84 
   85         cutoff = ULLONG_MAX / base;
   86         cutlim = ULLONG_MAX % base;
   87         for ( ; ; c = *s++) {
   88 #ifdef notyet
   89                 if (iswdigit(c))
   90                         c = digittoint(c);
   91                 else
   92 #endif
   93                 if (c >= L'' && c <= L'9')
   94                         c -= L'';
   95                 else if (c >= L'A' && c <= L'Z')
   96                         c -= L'A' - 10;
   97                 else if (c >= L'a' && c <= L'z')
   98                         c -= L'a' - 10;
   99                 else
  100                         break;
  101                 if (c >= base)
  102                         break;
  103                 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
  104                         any = -1;
  105                 else {
  106                         any = 1;
  107                         acc *= base;
  108                         acc += c;
  109                 }
  110         }
  111         if (any < 0) {
  112                 acc = ULLONG_MAX;
  113                 errno = ERANGE;
  114         } else if (!any) {
  115 noconv:
  116                 errno = EINVAL;
  117         } else if (neg)
  118                 acc = -acc;
  119         if (endptr != NULL)
  120                 *endptr = (wchar_t *)(any ? s - 1 : nptr);
  121         return (acc);
  122 }

Cache object: 494136d40af880ab7658c7a0afdcd27b


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