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  * 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[] = "@(#)strtoq.c    8.1 (Berkeley) 6/4/93";
  38 #endif /* LIBC_SCCS and not lint */
  39 __FBSDID("FreeBSD: src/lib/libc/stdlib/strtoll.c,v 1.19 2002/09/06 11:23:59 tjr Exp ");
  40 #endif
  41 __FBSDID("$FreeBSD: src/lib/libc/locale/wcstoll.c,v 1.1 2002/09/22 08:06:45 tjr Exp $");
  42
  43 #include <errno.h>
  44 #include <limits.h>
  45 #include <stdlib.h>
  46 #include <wchar.h>
  47 #include <wctype.h>
  48
  49 /*
  50  * Convert a wide character string to a long long integer.
  51  */
  52 long long
  53 wcstoll(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr, int base)
  54 {
  55         const wchar_t *s;
  56         unsigned long long acc;
  57         wchar_t c;
  58         unsigned long long cutoff;
  59         int neg, any, cutlim;
  60
  61         /*
  62          * See strtoll for comments as to the logic used.
  63          */
  64         s = nptr;
  65         do {
  66                 c = *s++;
  67         } while (iswspace(c));
  68         if (c == L'-') {
  69                 neg = 1;
  70                 c = *s++;
  71         } else {
  72                 neg = 0;
  73                 if (c == L'+')
  74                         c = *s++;
  75         }
  76         if ((base == 0 || base == 16) &&
  77             c == L'0' && (*s == L'x' || *s == L'X')) {
  78                 c = s[1];
  79                 s += 2;
  80                 base = 16;
  81         }
  82         if (base == 0)
  83                 base = c == L'0' ? 8 : 10;
  84         acc = any = 0;
  85         if (base < 2 || base > 36)
  86                 goto noconv;
  87
  88         cutoff = neg ? (unsigned long long)-(LLONG_MIN + LLONG_MAX) + LLONG_MAX
  89             : LLONG_MAX;
  90         cutlim = cutoff % base;
  91         cutoff /= base;
  92         for ( ; ; c = *s++) {
  93 #ifdef notyet
  94                 if (iswdigit(c))
  95                         c = digittoint(c);
  96                 else
  97 #endif
  98                 if (c >= L'0' && c <= L'9')
  99                         c -= L'0';
 100                 else if (c >= L'A' && c <= L'Z')
 101                         c -= L'A' - 10;
 102                 else if (c >= L'a' && c <= L'z')
 103                         c -= L'a' - 10;
 104                 else
 105                         break;
 106                 if (c >= base)
 107                         break;
 108                 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
 109                         any = -1;
 110                 else {
 111                         any = 1;
 112                         acc *= base;
 113                         acc += c;
 114                 }
 115         }
 116         if (any < 0) {
 117                 acc = neg ? LLONG_MIN : LLONG_MAX;
 118                 errno = ERANGE;
 119         } else if (!any) {
 120 noconv:
 121                 errno = EINVAL;
 122         } else if (neg)
 123                 acc = -acc;
 124         if (endptr != NULL)
 125                 *endptr = (wchar_t *)(any ? s - 1 : nptr);
 126         return (acc);
 127 }