/* Test mpz_add, mpz_add_ui, mpz_cmp, mpz_cmp, mpz_mul, mpz_sqrtrem.

Copyright (C) 1991, 1993 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 General Public License as published by
the Free Software Foundation; either version 2, 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with the GNU MP Library; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include <stdio.h>
#include "gmp.h"
#include "gmp-impl.h"
#include "urandom.h"

void debug_mp ();

#ifndef SIZE
#define SIZE 8
#endif

main (argc, argv)
     int argc;
     char **argv;
{
  MP_INT x2;
  MP_INT x, rem;
  MP_INT temp, temp2;
  mp_size x2_size;
  int i;
  int reps = 100000;

  if (argc == 2)
     reps = atoi (argv[1]);

  mpz_init (&x2);
  mpz_init (&x);
  mpz_init (&rem);
  mpz_init (&temp);
  mpz_init (&temp2);

  for (i = 0; i < reps; i++)
    {
      x2_size = urandom () % SIZE;

      mpz_random2 (&x2, x2_size);

      mpz_sqrtrem (&x, &rem, &x2);
      mpz_mul (&temp, &x, &x);

      /* Is square of result > argument?  */
      if (mpz_cmp (&temp, &x2) > 0)
	dump_abort (&x2, &x, &rem);

      mpz_add_ui (&temp2, &x, 1);
      mpz_mul (&temp2, &temp2, &temp2);

      /* Is square of (result + 1) <= argument?  */
      if (mpz_cmp (&temp2, &x2) <= 0)
	dump_abort (&x2, &x, &rem);

      mpz_add (&temp2, &temp, &rem);

      /* Is the remainder wrong?  */
      if (mpz_cmp (&x2, &temp2) != 0)
	dump_abort (&x2, &x, &rem);
    }

  exit (0);
}

dump_abort (x2, x, rem)
     MP_INT *x2, *x, *rem;
{
  fprintf (stderr, "ERROR\n");
  fprintf (stderr, "x2        = "); debug_mp (x2, -16);
  fprintf (stderr, "x         = "); debug_mp (x, -16);
  fprintf (stderr, "remainder = "); debug_mp (rem, -16);
  abort();
}

void
debug_mp (x, base)
     MP_INT *x;
{
  mpz_out_str (stderr, base, x); fputc ('\n', stderr);
}