stdlib/strtoull-fbsd.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 #if defined(LIBC_SCCS) && !defined(lint)
  35 static char sccsid[] = "@(#)strtouq.c   8.1 (Berkeley) 6/4/93";
  36 #endif /* LIBC_SCCS and not lint */
  37 #include <sys/cdefs.h>
  38 __FBSDID("$FreeBSD: src/lib/libc/stdlib/strtoull.c,v 1.18 2002/09/06 11:23:59 tjr Exp $");
  39
  40 #include "xlocale_private.h"
  41
  42 #include <limits.h>
  43 #include <errno.h>
  44 #include <ctype.h>
  45 #include <stdlib.h>
  46
  47 /*
  48  * Convert a string to an unsigned long long integer.
  49  *
  50  * Assumes that the upper and lower case
  51  * alphabets and digits are each contiguous.
  52  */
  53 unsigned long long
  54 strtoull_l(const char * __restrict nptr, char ** __restrict endptr, int base,
  55     locale_t loc)
  56 {
  57         const char *s;
  58         unsigned long long acc;
  59         char c;
  60         unsigned long long cutoff;
  61         int neg, any, cutlim;
  62
  63         NORMALIZE_LOCALE(loc);
  64         /*
  65          * See strtoq for comments as to the logic used.
  66          */
  67         s = nptr;
  68         do {
  69                 c = *s++;
  70         } while (isspace_l((unsigned char)c, loc));
  71         if (c == '-') {
  72                 neg = 1;
  73                 c = *s++;
  74         } else {
  75                 neg = 0;
  76                 if (c == '+')
  77                         c = *s++;
  78         }
  79         if ((base == 0 || base == 16) &&
  80             c == '0' && (*s == 'x' || *s == 'X')) {
  81                 c = s[1];
  82                 s += 2;
  83                 base = 16;
  84         }
  85         if (base == 0)
  86                 base = c == '0' ? 8 : 10;
  87         acc = any = 0;
  88         if (base < 2 || base > 36)
  89                 goto noconv;
  90
  91         cutoff = ULLONG_MAX / base;
  92         cutlim = ULLONG_MAX % base;
  93         for ( ; ; c = *s++) {
  94                 if (c >= '0' && c <= '9')
  95                         c -= '0';
  96                 else if (c >= 'A' && c <= 'Z')
  97                         c -= 'A' - 10;
  98                 else if (c >= 'a' && c <= 'z')
  99                         c -= '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 = ULLONG_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 = (char *)(any ? s - 1 : nptr);
 122         return (acc);
 123 }
 124
 125 unsigned long long
 126 strtoull(const char * __restrict nptr, char ** __restrict endptr, int base)
 127 {
 128         return strtoull_l(nptr, endptr, base, __current_locale());
 129 }