locale/FreeBSD/wcstoumax.c

   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  * 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 #if 0
  36 #if defined(LIBC_SCCS) && !defined(lint)
  37 static char sccsid[] = "from @(#)strtoul.c      8.1 (Berkeley) 6/4/93";
  38 #endif /* LIBC_SCCS and not lint */
  39 __FBSDID("FreeBSD: src/lib/libc/stdlib/strtoumax.c,v 1.8 2002/09/06 11:23:59 tjr Exp ");
  40 #endif
  41 __FBSDID("$FreeBSD: src/lib/libc/locale/wcstoumax.c,v 1.1 2002/09/22 08:06:45 tjr Exp $");
  42
  43 #include <errno.h>
  44 #include <inttypes.h>
  45 #include <stdlib.h>
  46 #include <wchar.h>
  47 #include <wctype.h>
  48
  49 /*
  50  * Convert a wide character string to a uintmax_t integer.
  51  */
  52 uintmax_t
  53 wcstoumax(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr,
  54     int base)
  55 {
  56         const wchar_t *s;
  57         uintmax_t acc;
  58         wchar_t c;
  59         uintmax_t cutoff;
  60         int neg, any, cutlim;
  61
  62         /*
  63          * See strtoimax for comments as to the logic used.
  64          */
  65         s = nptr;
  66         do {
  67                 c = *s++;
  68         } while (iswspace(c));
  69         if (c == L'-') {
  70                 neg = 1;
  71                 c = *s++;
  72         } else {
  73                 neg = 0;
  74                 if (c == L'+')
  75                         c = *s++;
  76         }
  77         if ((base == 0 || base == 16) &&
  78             c == L'0' && (*s == L'x' || *s == L'X')) {
  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 = UINTMAX_MAX / base;
  90         cutlim = UINTMAX_MAX % base;
  91         for ( ; ; c = *s++) {
  92 #ifdef notyet
  93                 if (iswdigit(c))
  94                         c = digittoint(c);
  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 >= L'a' && c <= L'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 = UINTMAX_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 }