/* Exercise mpz_get_si.

Copyright 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 3 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.  If not, see http://www.gnu.org/licenses/.  */

#include <stdio.h>
#include <stdlib.h>
#include "gmp.h"
#include "gmp-impl.h"
#include "tests.h"


void
check_data (void)
{
  static const struct {
    const char  *n;
    long        want;
  } data[] = {
    { "0",      0L },
    { "1",      1L },
    { "-1",     -1L },
    { "2",      2L },
    { "-2",     -2L },
    { "12345",  12345L },
    { "-12345", -12345L },
  };

  int    i;
  mpz_t  n;
  long   got;

  mpz_init (n);
  for (i = 0; i < numberof (data); i++)
    {
      mpz_set_str_or_abort (n, data[i].n, 0);

      got = mpz_get_si (n);
      if (got != data[i].want)
	{
	  printf ("mpz_get_si wrong at data[%d]\n", i);
	  printf ("   n     \"%s\" (", data[i].n);
	  mpz_out_str (stdout, 10, n); printf (", hex ");
	  mpz_out_str (stdout, 16, n); printf (")\n");
	  printf ("   got   %ld (0x%lX)\n", got, got);
	  printf ("   want  %ld (0x%lX)\n", data[i].want, data[i].want);
	  abort();
	}
    }
  mpz_clear (n);
}


void
check_max (void)
{
  mpz_t  n;
  long   want;
  long   got;

  mpz_init (n);

#define CHECK_MAX(name)                                 \
  if (got != want)                                      \
    {                                                   \
      printf ("mpz_get_si wrong on %s\n", name);        \
      printf ("   n    ");                              \
      mpz_out_str (stdout, 10, n); printf (", hex ");   \
      mpz_out_str (stdout, 16, n); printf ("\n");       \
      printf ("   got  %ld, hex %lX\n", got, got);      \
      printf ("   want %ld, hex %lX\n", want, want);    \
      abort();                                          \
    }

  want = LONG_MAX;
  mpz_set_si (n, want);
  got = mpz_get_si (n);
  CHECK_MAX ("LONG_MAX");

  want = LONG_MIN;
  mpz_set_si (n, want);
  got = mpz_get_si (n);
  CHECK_MAX ("LONG_MIN");

  /* The following checks that -0x100000000 gives -0x80000000.  This doesn't
     actually fit in a long and the result from mpz_get_si() is undefined,
     but -0x80000000 is what comes out currently, and it should be that
     value irrespective of the mp_limb_t size (long or long long).  */

  want = LONG_MIN;
  mpz_mul_2exp (n, n, 1);
  CHECK_MAX ("-0x100...00");

  mpz_clear (n);
}


int
main (void)
{
  tests_start ();

  check_data ();
  check_max ();

  tests_end ();
  exit (0);
}
