tout_str.c

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

/* Test file for mpfr_out_str.

Copyright 1999, 2001, 2002 Free Software Foundation, Inc.

This file is part of the MPFR Library.

The MPFR 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 MPFR 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 MPFR 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 <math.h>
#include <float.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "gmp.h"
#include "mpfr.h"
#include "mpfr-test.h"

FILE *fout;

#define check(d,r,b) check4(d,r,b,53)

void check4 _PROTO((double, mp_rnd_t, int, int)); 
void check_large _PROTO((void)); 

void
check4(double d, mp_rnd_t rnd, int base, int prec)
{
  mpfr_t x;

  mpfr_init2(x, prec);
  mpfr_set_d(x, d, rnd);
  fprintf(fout, "%1.19e base %d rnd %d:\n ", d, base, rnd);
  mpfr_out_str(fout, base, (base==2) ? prec : 0, x, rnd);
  fputc('\n', fout);
  mpfr_clear(x);
}

void
check_large (void)
{
  mpfr_t x; mp_exp_t e; char *s;

  mpfr_init(x);

  mpfr_set_prec (x, 7);
  mpfr_set_str_raw (x, "0.1010101E10");
  s = mpfr_get_str (NULL, &e, 10, 2, x, GMP_RNDU);
  free (s);

  /* checks rounding of negative numbers */
  mpfr_set_prec (x, 7);
  mpfr_set_d (x, -11.5, GMP_RNDN);
  s = mpfr_get_str (NULL, &e, 10, 2, x, GMP_RNDD);
  if (strcmp (s, "-12"))
    {
      fprintf (stderr, "Error in mpfr_get_str for x=-11.5 and rnd=GMP_RNDD\n");
      free (s);
      mpfr_clear (x);
      exit (1);
  }
  free (s);

  s = mpfr_get_str (NULL, &e, 10, 2, x, GMP_RNDU);
  if (strcmp (s, "-11"))
    {
      fprintf (stderr, "Error in mpfr_get_str for x=-11.5 and rnd=GMP_RNDU\n");
      free (s);
      mpfr_clear (x);
      exit (1);
    }
  free (s);

  /* bug found by Jean-Pierre Merlet, produced error in mpfr_get_str */
  mpfr_set_prec (x, 128);
  mpfr_set_str_raw (x, "0.10111001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011010E3");
  s = mpfr_get_str (NULL, &e, 10, 0, x, GMP_RNDU);
  free (s);

  mpfr_set_prec (x, 381);
  mpfr_set_str_raw (x, "0.111111111111111111111111111111111111111111111111111111111111111111101110110000100110011101101101001010111000101111000100100011110101010110101110100000010100001000110100000100011111001000010010000010001010111001011110000001110010111101100001111000101101100000010110000101100100000101010110010110001010100111001111100011100101100000100100111001100010010011110011011010110000001000010");
  s = mpfr_get_str (NULL, &e, 10, 0, x, GMP_RNDD);
  if (e != 0)
    {
      fprintf (stderr, "Error in mpfr_get_str for x=0.999999..., exponent is %d instead of 0\n", (int) e);
      exit (1);
    }
  free (s);

  mpfr_clear (x);
}

int
main (int argc, char *argv[])
{
  int i,N=10000,r,p; double d;

  check_large();
  /* with no argument: prints to /dev/null,
     tout_str N: prints N tests to stdout */
  if (argc==1) fout=fopen("/dev/null", "w");
  else { fout=stdout; N=atoi(argv[1]); }
  check(-1.37247529013405550000e+15, GMP_RNDN, 7);
  check(-1.5674376729569697500e+15, GMP_RNDN, 19);
  check(-5.71262771772792640000e-79, GMP_RNDU, 16);
  check(-0.0, GMP_RNDU, 7);
  check(-4.5306392613572974756e-308, GMP_RNDN, 8);
  check(-6.7265890111403371523e-165, GMP_RNDN, 4);
  check(-1.3242553591261807653e+156, GMP_RNDN, 16);
  check(-6.606499965302424244461355e233, GMP_RNDN, 10);
  check4(1.0, GMP_RNDN, 10, 120);
  check(1.0, GMP_RNDU, 10);
  check(4.059650008e-83, GMP_RNDN, 10);
  check(-7.4, GMP_RNDN, 10);
  check(0.997, GMP_RNDN, 10);
  check(-4.53063926135729747564e-308, GMP_RNDN, 10);
  check(2.14478198760196000000e+16, GMP_RNDN, 10);
  check(7.02293374921793516813e-84, GMP_RNDN, 10);

  /* random tests */
  SEED_RAND (time(NULL));
  for (i=0;i<N;i++)
    {
      do
        {
          d = drand ();
        }
#ifdef HAVE_DENORMS
      while (0);
#else
      while (ABS(d) < DBL_MIN);
#endif
      r = LONG_RAND() % 4;
      p = 2 + LONG_RAND() % 35;
      check (d, r, p);
    }

  return 0;
}