locale/FreeBSD/wcstol.c

   1 /*-
   2  * Copyright (c) 1990, 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 __FBSDID("$FreeBSD: src/lib/libc/locale/wcstol.c,v 1.2 2007/01/09 00:28:01 imp Exp $");
  32
  33 #include <ctype.h>
  34 #include <errno.h>
  35 #include <limits.h>
  36 #include <wchar.h>
  37 #include <wctype.h>
  38
  39 /*
  40  * Convert a string to a long integer.
  41  */
  42 long
  43 wcstol(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr, int base)
  44 {
  45         const wchar_t *s;
  46         unsigned long acc;
  47         wchar_t c;
  48         unsigned long cutoff;
  49         int neg, any, cutlim;
  50
  51         /*
  52          * See strtol for comments as to the logic used.
  53          */
  54         s = nptr;
  55         do {
  56                 c = *s++;
  57         } while (iswspace(c));
  58         if (c == '-') {
  59                 neg = 1;
  60                 c = *s++;
  61         } else {
  62                 neg = 0;
  63                 if (c == L'+')
  64                         c = *s++;
  65         }
  66         if ((base == 0 || base == 16) &&
  67             c == L'0' && (*s == L'x' || *s == L'X')) {
  68                 c = s[1];
  69                 s += 2;
  70                 base = 16;
  71         }
  72         if (base == 0)
  73                 base = c == L'0' ? 8 : 10;
  74         acc = any = 0;
  75         if (base < 2 || base > 36)
  76                 goto noconv;
  77
  78         cutoff = neg ? (unsigned long)-(LONG_MIN + LONG_MAX) + LONG_MAX
  79             : LONG_MAX;
  80         cutlim = cutoff % base;
  81         cutoff /= base;
  82         for ( ; ; c = *s++) {
  83 #ifdef notyet
  84                 if (iswdigit(c))
  85                         c = digittoint(c);
  86                 else
  87 #endif
  88                 if (c >= L'0' && c <= L'9')
  89                         c -= L'0';
  90                 else if (c >= L'A' && c <= L'Z')
  91                         c -= L'A' - 10;
  92                 else if (c >= L'a' && c <= L'z')
  93                         c -= L'a' - 10;
  94                 else
  95                         break;
  96                 if (c >= base)
  97                         break;
  98                 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
  99                         any = -1;
 100                 else {
 101                         any = 1;
 102                         acc *= base;
 103                         acc += c;
 104                 }
 105         }
 106         if (any < 0) {
 107                 acc = neg ? LONG_MIN : LONG_MAX;
 108                 errno = ERANGE;
 109         } else if (!any) {
 110 noconv:
 111                 errno = EINVAL;
 112         } else if (neg)
 113                 acc = -acc;
 114         if (endptr != NULL)
 115                 *endptr = (wchar_t *)(any ? s - 1 : nptr);
 116         return (acc);
 117 }