The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/libkern/strtoul.c

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    1 /*-
    2  * Copyright (c) 1990, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * Chris Torek.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. All advertising materials mentioning features or use of this software
   17  *    must display the following acknowledgement:
   18  *      This product includes software developed by the University of
   19  *      California, Berkeley and its contributors.
   20  * 4. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  * From: @(#)strtoul.c  8.1 (Berkeley) 6/4/93
   37  */
   38 
   39 #include <sys/cdefs.h>
   40 __FBSDID("$FreeBSD: releng/5.2/sys/libkern/strtoul.c 116189 2003-06-11 05:37:42Z obrien $");
   41 
   42 #include <sys/param.h>
   43 #include <sys/systm.h>
   44 #include <sys/ctype.h>
   45 #include <sys/limits.h>
   46 
   47 /*
   48  * Convert a string to an unsigned long integer.
   49  *
   50  * Ignores `locale' stuff.  Assumes that the upper and lower case
   51  * alphabets and digits are each contiguous.
   52  */
   53 unsigned long
   54 strtoul(nptr, endptr, base)
   55         const char *nptr;
   56         char **endptr;
   57         int base;
   58 {
   59         const char *s = nptr;
   60         unsigned long acc;
   61         unsigned char c;
   62         unsigned long cutoff;
   63         int neg = 0, any, cutlim;
   64 
   65         /*
   66          * See strtol for comments as to the logic used.
   67          */
   68         do {
   69                 c = *s++;
   70         } while (isspace(c));
   71         if (c == '-') {
   72                 neg = 1;
   73                 c = *s++;
   74         } else if (c == '+')
   75                 c = *s++;
   76         if ((base == 0 || base == 16) &&
   77             c == '' && (*s == 'x' || *s == 'X')) {
   78                 c = s[1];
   79                 s += 2;
   80                 base = 16;
   81         }
   82         if (base == 0)
   83                 base = c == '' ? 8 : 10;
   84         cutoff = (unsigned long)ULONG_MAX / (unsigned long)base;
   85         cutlim = (unsigned long)ULONG_MAX % (unsigned long)base;
   86         for (acc = 0, any = 0;; c = *s++) {
   87                 if (!isascii(c))
   88                         break;
   89                 if (isdigit(c))
   90                         c -= '';
   91                 else if (isalpha(c))
   92                         c -= isupper(c) ? 'A' - 10 : 'a' - 10;
   93                 else
   94                         break;
   95                 if (c >= base)
   96                         break;
   97                 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
   98                         any = -1;
   99                 else {
  100                         any = 1;
  101                         acc *= base;
  102                         acc += c;
  103                 }
  104         }
  105         if (any < 0) {
  106                 acc = ULONG_MAX;
  107         } else if (neg)
  108                 acc = -acc;
  109         if (endptr != 0)
  110                 *((const char **)endptr) = any ? s - 1 : nptr;
  111         return (acc);
  112 }

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