osprey/cygnus/libiberty/strtol.c

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/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. [rescinded 22 July 1999]
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*

@deftypefn Supplemental {long int} strtol (const char *@var{string}, char **@var{endptr}, int @var{base})
@deftypefnx Supplemental {unsigned long int} strtoul (const char *@var{string}, char **@var{endptr}, int @var{base})

The @code{strtol} function converts the string in @var{string} to a
long integer value according to the given @var{base}, which must be
between 2 and 36 inclusive, or be the special value 0.  If @var{base}
is 0, @code{strtol} will look for the prefixes @code{0} and @code{0x}
to indicate bases 8 and 16, respectively, else default to base 10.
When the base is 16 (either explicitly or implicitly), a prefix of
@code{0x} is allowed.  The handling of @var{endptr} is as that of
@code{strtod} above.  The @code{strtoul} function is the same, except
that the converted value is unsigned.

@end deftypefn

*/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#include <errno.h>
#ifdef NEED_DECLARATION_ERRNO
extern int errno;
#endif
#include "safe-ctype.h"

/* FIXME: It'd be nice to configure around these, but the include files are too
   painful.  These macros should at least be more portable than hardwired hex
   constants. */

#ifndef ULONG_MAX
#define ULONG_MAX ((unsigned long)(~0L))    /* 0xFFFFFFFF */
#endif

#ifndef LONG_MAX
#define LONG_MAX  ((long)(ULONG_MAX >> 1))  /* 0x7FFFFFFF */
#endif

#ifndef LONG_MIN
#define LONG_MIN  ((long)(~LONG_MAX))   /* 0x80000000 */
#endif

/*
 * Convert a string to a long integer.
 *
 * Ignores `locale' stuff.  Assumes that the upper and lower case
 * alphabets and digits are each contiguous.
 */
long
strtol(nptr, endptr, base)
  const char *nptr;
  char **endptr;
  register int base;
{
  register const char *s = nptr;
  register unsigned long acc;
  register int c;
  register unsigned long cutoff;
  register int neg = 0, any, cutlim;

  /*
   * Skip white space and pick up leading +/- sign if any.
   * If base is 0, allow 0x for hex and 0 for octal, else
   * assume decimal; if base is already 16, allow 0x.
   */
  do {
    c = *s++;
  } while (ISSPACE(c));
  if (c == '-') {
    neg = 1;
    c = *s++;
  } else if (c == '+')
    c = *s++;
  if ((base == 0 || base == 16) &&
      c == '0' && (*s == 'x' || *s == 'X')) {
    c = s[1];
    s += 2;
    base = 16;
  }
  if (base == 0)
    base = c == '0' ? 8 : 10;

  /*
   * Compute the cutoff value between legal numbers and illegal
   * numbers.  That is the largest legal value, divided by the
   * base.  An input number that is greater than this value, if
   * followed by a legal input character, is too big.  One that
   * is equal to this value may be valid or not; the limit
   * between valid and invalid numbers is then based on the last
   * digit.  For instance, if the range for longs is
   * [-2147483648..2147483647] and the input base is 10,
   * cutoff will be set to 214748364 and cutlim to either
   * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated
   * a value > 214748364, or equal but the next digit is > 7 (or 8),
   * the number is too big, and we will return a range error.
   *
   * Set any if any `digits' consumed; make it negative to indicate
   * overflow.
   */
  cutoff = neg ? -(unsigned long)LONG_MIN : LONG_MAX;
  cutlim = cutoff % (unsigned long)base;
  cutoff /= (unsigned long)base;
  for (acc = 0, any = 0;; c = *s++) {
    if (ISDIGIT(c))
      c -= '0';
    else if (ISALPHA(c))
      c -= ISUPPER(c) ? 'A' - 10 : 'a' - 10;
    else
      break;
    if (c >= base)
      break;
    if (any < 0 || acc > cutoff || acc == cutoff && c > cutlim)
      any = -1;
    else {
      any = 1;
      acc *= base;
      acc += c;
    }
  }
  if (any < 0) {
    acc = neg ? LONG_MIN : LONG_MAX;
    errno = ERANGE;
  } else if (neg)
    acc = -acc;
  if (endptr != 0)
    *endptr = (char *) (any ? s - 1 : nptr);
  return (acc);
}

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