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  * 4. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  * From: @(#)strtoul.c  8.1 (Berkeley) 6/4/93
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD: stable/11/sys/libkern/strtoul.c 298069 2016-04-15 16:10:11Z pfg $");
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/ctype.h>
   41 #include <sys/limits.h>
   42 
   43 /*
   44  * Convert a string to an unsigned long integer.
   45  *
   46  * Ignores `locale' stuff.  Assumes that the upper and lower case
   47  * alphabets and digits are each contiguous.
   48  */
   49 unsigned long
   50 strtoul(nptr, endptr, base)
   51         const char *nptr;
   52         char **endptr;
   53         int base;
   54 {
   55         const char *s = nptr;
   56         unsigned long acc;
   57         unsigned char c;
   58         unsigned long cutoff;
   59         int neg = 0, any, cutlim;
   60 
   61         /*
   62          * See strtol for comments as to the logic used.
   63          */
   64         do {
   65                 c = *s++;
   66         } while (isspace(c));
   67         if (c == '-') {
   68                 neg = 1;
   69                 c = *s++;
   70         } else if (c == '+')
   71                 c = *s++;
   72         if ((base == 0 || base == 16) &&
   73             c == '' && (*s == 'x' || *s == 'X')) {
   74                 c = s[1];
   75                 s += 2;
   76                 base = 16;
   77         }
   78         if (base == 0)
   79                 base = c == '' ? 8 : 10;
   80         cutoff = (unsigned long)ULONG_MAX / (unsigned long)base;
   81         cutlim = (unsigned long)ULONG_MAX % (unsigned long)base;
   82         for (acc = 0, any = 0;; c = *s++) {
   83                 if (!isascii(c))
   84                         break;
   85                 if (isdigit(c))
   86                         c -= '';
   87                 else if (isalpha(c))
   88                         c -= isupper(c) ? 'A' - 10 : 'a' - 10;
   89                 else
   90                         break;
   91                 if (c >= base)
   92                         break;
   93                 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
   94                         any = -1;
   95                 else {
   96                         any = 1;
   97                         acc *= base;
   98                         acc += c;
   99                 }
  100         }
  101         if (any < 0) {
  102                 acc = ULONG_MAX;
  103         } else if (neg)
  104                 acc = -acc;
  105         if (endptr != NULL)
  106                 *endptr = __DECONST(char *, any ? s - 1 : nptr);
  107         return (acc);
  108 }

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