locale/FreeBSD/wcstoimax.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  * 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[] = "from @(#)strtol.c       8.1 (Berkeley) 6/4/93";
  34 #endif /* LIBC_SCCS and not lint */
  35 __FBSDID("FreeBSD: src/lib/libc/stdlib/strtoimax.c,v 1.8 2002/09/06 11:23:59 tjr Exp ");
  36 #endif
  37 __FBSDID("$FreeBSD: src/lib/libc/locale/wcstoimax.c,v 1.3 2007/01/09 00:28:01 imp Exp $");
  38
  39 #include <errno.h>
  40 #include <inttypes.h>
  41 #include <stdlib.h>
  42 #include <wchar.h>
  43 #include <wctype.h>
  44
  45 /*
  46  * Convert a wide character string to an intmax_t integer.
  47  */
  48 intmax_t
  49 wcstoimax(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr,
  50     int base)
  51 {
  52         const wchar_t *s;
  53         uintmax_t acc;
  54         wchar_t c;
  55         uintmax_t cutoff;
  56         int neg, any, cutlim;
  57
  58         /*
  59          * See strtoimax 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'0' && (*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'0' ? 8 : 10;
  81         acc = any = 0;
  82         if (base < 2 || base > 36)
  83                 goto noconv;
  84
  85         cutoff = neg ? (uintmax_t)-(INTMAX_MIN + INTMAX_MAX) + INTMAX_MAX
  86             : INTMAX_MAX;
  87         cutlim = cutoff % base;
  88         cutoff /= base;
  89         for ( ; ; c = *s++) {
  90 #ifdef notyet
  91                 if (iswdigit(c))
  92                         c = digittoint(c);
  93                 else
  94 #endif
  95                 if (c >= L'0' && c <= L'9')
  96                         c -= L'0';
  97                 else if (c >= L'A' && c <= L'Z')
  98                         c -= L'A' - 10;
  99                 else if (c >= 'a' && c <= 'z')
 100                         c -= L'a' - 10;
 101                 else
 102                         break;
 103                 if (c >= base)
 104                         break;
 105                 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
 106                         any = -1;
 107                 else {
 108                         any = 1;
 109                         acc *= base;
 110                         acc += c;
 111                 }
 112         }
 113         if (any < 0) {
 114                 acc = neg ? INTMAX_MIN : INTMAX_MAX;
 115                 errno = ERANGE;
 116         } else if (!any) {
 117 noconv:
 118                 errno = EINVAL;
 119         } else if (neg)
 120                 acc = -acc;
 121         if (endptr != NULL)
 122                 *endptr = (wchar_t *)(any ? s - 1 : nptr);
 123         return (acc);
 124 }