locale/FreeBSD/wcstoll.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[] = "@(#)strtoq.c    8.1 (Berkeley) 6/4/93";
  34 #endif /* LIBC_SCCS and not lint */
  35 __FBSDID("FreeBSD: src/lib/libc/stdlib/strtoll.c,v 1.19 2002/09/06 11:23:59 tjr Exp ");
  36 #endif
  37 __FBSDID("$FreeBSD: src/lib/libc/locale/wcstoll.c,v 1.2 2007/01/09 00:28:01 imp Exp $");
  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 a long long integer.
  47  */
  48 long long
  49 wcstoll(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr, int base)
  50 {
  51         const wchar_t *s;
  52         unsigned long long acc;
  53         wchar_t c;
  54         unsigned long long cutoff;
  55         int neg, any, cutlim;
  56
  57         /*
  58          * See strtoll for comments as to the logic used.
  59          */
  60         s = nptr;
  61         do {
  62                 c = *s++;
  63         } while (iswspace(c));
  64         if (c == L'-') {
  65                 neg = 1;
  66                 c = *s++;
  67         } else {
  68                 neg = 0;
  69                 if (c == L'+')
  70                         c = *s++;
  71         }
  72         if ((base == 0 || base == 16) &&
  73             c == L'0' && (*s == L'x' || *s == L'X')) {
  74                 c = s[1];
  75                 s += 2;
  76                 base = 16;
  77         }
  78         if (base == 0)
  79                 base = c == L'0' ? 8 : 10;
  80         acc = any = 0;
  81         if (base < 2 || base > 36)
  82                 goto noconv;
  83
  84         cutoff = neg ? (unsigned long long)-(LLONG_MIN + LLONG_MAX) + LLONG_MAX
  85             : LLONG_MAX;
  86         cutlim = cutoff % base;
  87         cutoff /= base;
  88         for ( ; ; c = *s++) {
  89 #ifdef notyet
  90                 if (iswdigit(c))
  91                         c = digittoint(c);
  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 = neg ? LLONG_MIN : LLONG_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 }