stdlib/FreeBSD/strtoull.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 #if defined(LIBC_SCCS) && !defined(lint)
  31 static char sccsid[] = "@(#)strtouq.c   8.1 (Berkeley) 6/4/93";
  32 #endif /* LIBC_SCCS and not lint */
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD: src/lib/libc/stdlib/strtoull.c,v 1.21 2007/01/09 00:28:10 imp Exp $");
  35
  36 #include "xlocale_private.h"
  37
  38 #include <limits.h>
  39 #include <errno.h>
  40 #include <ctype.h>
  41 #include <stdlib.h>
  42
  43 /*
  44  * Convert a string to an unsigned long long integer.
  45  *
  46  * Assumes that the upper and lower case
  47  * alphabets and digits are each contiguous.
  48  */
  49 unsigned long long
  50 strtoull_l(const char * __restrict nptr, char ** __restrict endptr, int base,
  51     locale_t loc)
  52 {
  53         const char *s;
  54         unsigned long long acc;
  55         char c;
  56         unsigned long long cutoff;
  57         int neg, any, cutlim;
  58
  59         NORMALIZE_LOCALE(loc);
  60         /*
  61          * See strtoq for comments as to the logic used.
  62          */
  63         s = nptr;
  64         do {
  65                 c = *s++;
  66         } while (isspace_l((unsigned char)c, loc));
  67         if (c == '-') {
  68                 neg = 1;
  69                 c = *s++;
  70         } else {
  71                 neg = 0;
  72                 if (c == '+')
  73                         c = *s++;
  74         }
  75         if ((base == 0 || base == 16) &&
  76             c == '0' && (*s == 'x' || *s == 'X') &&
  77             ((s[1] >= '0' && s[1] <= '9') ||
  78             (s[1] >= 'A' && s[1] <= 'F') ||
  79             (s[1] >= 'a' && s[1] <= 'f'))) {
  80                 c = s[1];
  81                 s += 2;
  82                 base = 16;
  83         }
  84         if (base == 0)
  85                 base = c == '0' ? 8 : 10;
  86         acc = any = 0;
  87         if (base < 2 || base > 36)
  88                 goto noconv;
  89
  90         cutoff = ULLONG_MAX / base;
  91         cutlim = ULLONG_MAX % base;
  92         for ( ; ; c = *s++) {
  93                 if (c >= '0' && c <= '9')
  94                         c -= '0';
  95                 else if (c >= 'A' && c <= 'Z')
  96                         c -= 'A' - 10;
  97                 else if (c >= 'a' && c <= 'z')
  98                         c -= 'a' - 10;
  99                 else
 100                         break;
 101                 if (c >= base)
 102                         break;
 103                 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
 104                         any = -1;
 105                 else {
 106                         any = 1;
 107                         acc *= base;
 108                         acc += c;
 109                 }
 110         }
 111         if (any < 0) {
 112                 acc = ULLONG_MAX;
 113                 errno = ERANGE;
 114         } else if (!any) {
 115 noconv:
 116                 errno = EINVAL;
 117         } else if (neg)
 118                 acc = -acc;
 119         if (endptr != NULL)
 120                 *endptr = (char *)(any ? s - 1 : nptr);
 121         return (acc);
 122 }
 123
 124 unsigned long long
 125 strtoull(const char * __restrict nptr, char ** __restrict endptr, int base)
 126 {
 127         return strtoull_l(nptr, endptr, base, __current_locale());
 128 }