/* 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 {
    int         base;
    const char  *f;
    long        want;
  } data[] = {
    { 10, "0",      0L },
    { 10, "1",      1L },
    { 10, "-1",     -1L },
    { 10, "2",      2L },
    { 10, "-2",     -2L },
    { 10, "12345",  12345L },
    { 10, "-12345", -12345L },

    /* fraction bits ignored */
    { 10, "0.5",    0L },
    { 10, "-0.5",   0L },
    { 10, "1.1",    1L },
    { 10, "-1.1",   -1L },
    { 10, "1.9",    1L },
    { 10, "-1.9",   -1L },
    { 16, "1.000000000000000000000000000000000000000000000000001", 1L },
    { 16, "-1.000000000000000000000000000000000000000000000000001", -1L },

    /* low bits extracted (this is undocumented) */
    { 16, "1000000000000000000000000000000000000000000000000001", 1L },
    { 16, "-1000000000000000000000000000000000000000000000000001", -1L },
  };

  int    i;
  mpf_t  f;
  long   got;

  mpf_init2 (f, 2000L);
  for (i = 0; i < numberof (data); i++)
    {
      mpf_set_str_or_abort (f, data[i].f, data[i].base);

      got = mpf_get_si (f);
      if (got != data[i].want)
	{
	  printf ("mpf_get_si wrong at data[%d]\n", i);
	  printf ("   f     \"%s\"\n", data[i].f);
	  printf ("     dec "); mpf_out_str (stdout, 10, 0, f); printf ("\n");
	  printf ("     hex "); mpf_out_str (stdout, 16, 0, f); printf ("\n");
	  printf ("     size %ld\n", (long) SIZ(f));
	  printf ("     exp  %ld\n", (long) EXP(f));
	  printf ("   got   %ld (0x%lX)\n", got, got);
	  printf ("   want  %ld (0x%lX)\n", data[i].want, data[i].want);
	  abort();
	}
    }
  mpf_clear (f);
}


void
check_max (void)
{
  mpf_t  f;
  long   want;
  long   got;

  mpf_init2 (f, 200L);

#define CHECK_MAX(name)                                         \
  if (got != want)                                              \
    {                                                           \
      printf ("mpf_get_si wrong on %s\n", name);                \
      printf ("   f    ");                                      \
      mpf_out_str (stdout, 10, 0, f); printf (", hex ");        \
      mpf_out_str (stdout, 16, 0, f); printf ("\n");            \
      printf ("   got  %ld, hex %lX\n", got, got);              \
      printf ("   want %ld, hex %lX\n", want, want);            \
      abort();                                                  \
    }

  want = LONG_MAX;
  mpf_set_si (f, want);
  got = mpf_get_si (f);
  CHECK_MAX ("LONG_MAX");

  want = LONG_MIN;
  mpf_set_si (f, want);
  got = mpf_get_si (f);
  CHECK_MAX ("LONG_MIN");

  mpf_clear (f);
}


void
check_limbdata (void)
{
#define M  GMP_NUMB_MAX

  static const struct {
    mp_exp_t       exp;
    mp_size_t      size;
    mp_limb_t      d[10];
    unsigned long  want;

  } data[] = {

    /* in the comments here, a "_" indicates a digit (ie. limb) position not
       included in the d data, and therefore zero */

    { 0, 0, { 0 }, 0L },    /* 0 */

    { 1,  1, { 1 }, 1L },   /* 1 */
    { 1, -1, { 1 }, -1L },  /* -1 */

    { 0,  1, { 1 }, 0L },   /* .1 */
    { 0, -1, { 1 }, 0L },   /* -.1 */

    { -1,  1, { 1 }, 0L },  /* ._1 */
    { -1, -1, { 1 }, 0L },  /* -._1 */

    { -999,          1, { 1 }, 0L },   /* .___1 small */
    { MP_EXP_T_MIN,  1, { 1 }, 0L },   /* .____1 very small */

    { 999,          1, { 1 }, 0L },    /* 1____. big */
    { MP_EXP_T_MAX, 1, { 1 }, 0L },    /* 1_____. very big */

    { 1, 2, { 999, 2 }, 2L },                  /* 2.9 */
    { 5, 8, { 7, 8, 9, 3, 0, 0, 0, 1 }, 3L },  /* 10003.987 */

    { 2, 2, { M, M },    LONG_MAX }, /* FF. */
    { 2, 2, { M, M, M }, LONG_MAX }, /* FF.F */
    { 3, 3, { M, M, M }, LONG_MAX }, /* FFF. */

#if GMP_NUMB_BITS >= BITS_PER_ULONG
    /* normal case, numb bigger than long */
    { 2,  1, { 1 },    0L },      /* 1_. */
    { 2,  2, { 0, 1 }, 0L },      /* 10. */
    { 2,  2, { 999, 1 }, 999L },  /* 19. */
    { 3,  2, { 999, 1 }, 0L },    /* 19_. */

#else
    /* nails case, numb smaller than long */
    { 2,  1, { 1 }, 1L << GMP_NUMB_BITS },  /* 1_. */
    { 3,  1, { 1 }, 0L },                   /* 1__. */

    { 2,  2, { 99, 1 },    99L + (1L << GMP_NUMB_BITS) },  /* 19. */
    { 3,  2, { 1, 99 },    1L << GMP_NUMB_BITS },          /* 91_. */
    { 3,  3, { 0, 1, 99 }, 1L << GMP_NUMB_BITS },          /* 910. */

#endif
  };

  mpf_t          f;
  unsigned long  got;
  int            i;
  mp_limb_t      buf[20 + numberof(data[i].d)];

  for (i = 0; i < numberof (data); i++)
    {
      refmpn_fill (buf, 10, CNST_LIMB(0xDEADBEEF));
      refmpn_copy (buf+10, data[i].d, ABS(data[i].size));
      refmpn_fill (buf+10+ABS(data[i].size), 10, CNST_LIMB(0xDEADBEEF));

      PTR(f) = buf+10;
      EXP(f) = data[i].exp;
      SIZ(f) = data[i].size;
      PREC(f) = numberof (data[i].d);
      MPF_CHECK_FORMAT (f);

      got = mpf_get_si (f);
      if (got != data[i].want)
	{
	  printf    ("mpf_get_si wrong at limb data[%d]\n", i);
	  mpf_trace ("  f", f);
	  mpn_trace ("  d", data[i].d, data[i].size);
	  printf    ("  size %ld\n", (long) data[i].size);
	  printf    ("  exp %ld\n", (long) data[i].exp);
	  printf    ("  got   %lu (0x%lX)\n", got, got);
	  printf    ("  want  %lu (0x%lX)\n", data[i].want, data[i].want);
	  abort();
	}
    }
}


int
main (void)
{
  tests_start ();

  check_data ();
  check_max ();
  check_limbdata ();

  tests_end ();
  exit (0);
}
