The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/stdlib/strtol.c

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    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  * 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[] = "@(#)strtol.c    8.1 (Berkeley) 6/4/93";
   36 #endif /* LIBC_SCCS and not lint */
   37 #include <sys/cdefs.h>
   38 __FBSDID("$FreeBSD: stable/6/lib/libc/stdlib/strtol.c 140577 2005-01-21 13:31:02Z ache $");
   39 
   40 #include <limits.h>
   41 #include <ctype.h>
   42 #include <errno.h>
   43 #include <stdlib.h>
   44 
   45 
   46 /*
   47  * Convert a string to a long integer.
   48  *
   49  * Assumes that the upper and lower case
   50  * alphabets and digits are each contiguous.
   51  */
   52 long
   53 strtol(const char * __restrict nptr, char ** __restrict endptr, int base)
   54 {
   55         const char *s;
   56         unsigned long acc;
   57         char c;
   58         unsigned long cutoff;
   59         int neg, any, cutlim;
   60 
   61         /*
   62          * Skip white space and pick up leading +/- sign if any.
   63          * If base is 0, allow 0x for hex and 0 for octal, else
   64          * assume decimal; if base is already 16, allow 0x.
   65          */
   66         s = nptr;
   67         do {
   68                 c = *s++;
   69         } while (isspace((unsigned char)c));
   70         if (c == '-') {
   71                 neg = 1;
   72                 c = *s++;
   73         } else {
   74                 neg = 0;
   75                 if (c == '+')
   76                         c = *s++;
   77         }
   78         if ((base == 0 || base == 16) &&
   79             c == '' && (*s == 'x' || *s == 'X') &&
   80             ((s[1] >= '' && s[1] <= '9') ||
   81             (s[1] >= 'A' && s[1] <= 'F') ||
   82             (s[1] >= 'a' && s[1] <= 'f'))) {
   83                 c = s[1];
   84                 s += 2;
   85                 base = 16;
   86         }
   87         if (base == 0)
   88                 base = c == '' ? 8 : 10;
   89         acc = any = 0;
   90         if (base < 2 || base > 36)
   91                 goto noconv;
   92 
   93         /*
   94          * Compute the cutoff value between legal numbers and illegal
   95          * numbers.  That is the largest legal value, divided by the
   96          * base.  An input number that is greater than this value, if
   97          * followed by a legal input character, is too big.  One that
   98          * is equal to this value may be valid or not; the limit
   99          * between valid and invalid numbers is then based on the last
  100          * digit.  For instance, if the range for longs is
  101          * [-2147483648..2147483647] and the input base is 10,
  102          * cutoff will be set to 214748364 and cutlim to either
  103          * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated
  104          * a value > 214748364, or equal but the next digit is > 7 (or 8),
  105          * the number is too big, and we will return a range error.
  106          *
  107          * Set 'any' if any `digits' consumed; make it negative to indicate
  108          * overflow.
  109          */
  110         cutoff = neg ? (unsigned long)-(LONG_MIN + LONG_MAX) + LONG_MAX
  111             : LONG_MAX;
  112         cutlim = cutoff % base;
  113         cutoff /= base;
  114         for ( ; ; c = *s++) {
  115                 if (c >= '' && c <= '9')
  116                         c -= '';
  117                 else if (c >= 'A' && c <= 'Z')
  118                         c -= 'A' - 10;
  119                 else if (c >= 'a' && c <= 'z')
  120                         c -= 'a' - 10;
  121                 else
  122                         break;
  123                 if (c >= base)
  124                         break;
  125                 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
  126                         any = -1;
  127                 else {
  128                         any = 1;
  129                         acc *= base;
  130                         acc += c;
  131                 }
  132         }
  133         if (any < 0) {
  134                 acc = neg ? LONG_MIN : LONG_MAX;
  135                 errno = ERANGE;
  136         } else if (!any) {
  137 noconv:
  138                 errno = EINVAL;
  139         } else if (neg)
  140                 acc = -acc;
  141         if (endptr != NULL)
  142                 *endptr = (char *)(any ? s - 1 : nptr);
  143         return (acc);
  144 }

Cache object: 360b6f4c6a9566a3196bb8ca65973dfc


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