t-conv.c

a very popular packet of cryptography tools,it encloses the most common used algorithm and protocols

/* Test mpf_get_str and mpf_set_str.

Copyright 1996, 2000, 2001 Free Software Foundation, Inc.

This file is part of the GNU MP Library.

The GNU MP Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or (at your
option) any later version.

The GNU MP Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
License for more details.

You should have received a copy of the GNU Lesser General Public License
along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */

#include <stdio.h>
#include <stdlib.h>
#include <string.h> /* for strlen */

#include "gmp.h"
#include "gmp-impl.h"
#include "tests.h"

#ifndef SIZE
#define SIZE 10
#endif

#ifndef EXPO
#define EXPO 20
#endif

int
main (int argc, char **argv)
{
  mpf_t x, y;
  int reps = 20000;
  int i;
  mp_size_t bprec = 100;
  mpf_t d, rerr, max_rerr, limit_rerr;
  char *str;
  mp_exp_t bexp;
  long size, exp;
  int base;
  char buf[SIZE * BITS_PER_MP_LIMB + 5];

  tests_start ();

  if (argc > 1)
    {
      reps = strtol (argv[1], 0, 0);
      if (argc > 2)
	bprec = strtol (argv[2], 0, 0);
    }

  mpf_set_default_prec (bprec);

  mpf_init_set_ui (limit_rerr, 1);
  mpf_div_2exp (limit_rerr, limit_rerr, bprec);
#if VERBOSE
  mpf_dump (limit_rerr);
#endif
  mpf_init (rerr);
  mpf_init_set_ui (max_rerr, 0);

  mpf_init (x);
  mpf_init (y);
  mpf_init (d);

  for (i = 0; i < reps; i++)
    {
      if (i == 0)
        {
          /* exercise the special case in get_str for for x==0 */
          mpf_set_ui (x, 0L);
          base = 10;
        }
      else
        {
          size = urandom () % (2 * SIZE) - SIZE;
          exp = urandom () % EXPO;
          mpf_random2 (x, size, exp);
          base = urandom () % 35 + 2;
        }

      str = mpf_get_str (0, &bexp, base, 0, x);

      if (str[0] == '-')
	sprintf (buf, "-0.%s@%ld", str + 1, bexp);
      else
	sprintf (buf, "0.%s@%ld", str, bexp);

      mpf_set_str_or_abort (y, buf, -base);
      (*__gmp_free_func) (str, strlen (str) + 1);

      mpf_reldiff (rerr, x, y);
      if (mpf_cmp (rerr, max_rerr) > 0)
	{
	  mpf_set (max_rerr, rerr);
#if VERBOSE
	  mpf_dump (max_rerr);
#endif
	  if (mpf_cmp (rerr, limit_rerr) > 0)
	    {
	      printf ("ERROR after %d tests\n", i);
	      printf ("base = %d\n", base);
	      printf ("   x = "); mpf_dump (x);
	      printf ("   y = "); mpf_dump (y);
	      abort ();
	    }
	}
    }

  mpf_clear (limit_rerr);
  mpf_clear (rerr);
  mpf_clear (max_rerr);

  mpf_clear (x);
  mpf_clear (y);
  mpf_clear (d);

  tests_end ();
  exit (0);
}