/* Test for correct rounding of printf floating-point output.

   Copyright (C) 2012-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C 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 C 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 C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <array_length.h>

#include <fenv.h>

#include <stdio.h>

#include <string.h>

struct dec_test {

  double d;

  const char *fmt;

  const char *rd, *rn, *rz, *ru;

};

static const struct dec_test dec_tests[] = {

  { 1.5, "%.0f", "1", "2", "1", "2" },

  { -1.5, "%.0f", "-2", "-2", "-1", "-1" },

  { 2.5, "%.0f", "2", "2", "2", "3" },

  { -2.5, "%.0f", "-3", "-2", "-2", "-2" },

  { 1.4999, "%.0f", "1", "1", "1", "2" },

  { -1.4999, "%.0f", "-2", "-1", "-1", "-1" },

  { 1.5001, "%.0f", "1", "2", "1", "2" },

  { -1.5001, "%.0f", "-2", "-2", "-1", "-1" },

  { 2.4999, "%.0f", "2", "2", "2", "3" },

  { -2.4999, "%.0f", "-3", "-2", "-2", "-2" },

  { 2.5001, "%.0f", "2", "3", "2", "3" },

  { -2.5001, "%.0f", "-3", "-3", "-2", "-2" },

  { 1.0 / 3.0, "%f", "0.333333", "0.333333", "0.333333", "0.333334" },

  { -1.0 / 3.0, "%f", "-0.333334", "-0.333333", "-0.333333", "-0.333333" },

  { 0.2500001, "%.2e", "2.50e-01", "2.50e-01", "2.50e-01", "2.51e-01" },

  { -0.2500001, "%.2e", "-2.51e-01", "-2.50e-01", "-2.50e-01", "-2.50e-01" },

  { 1000001.0, "%.1e", "1.0e+06", "1.0e+06", "1.0e+06", "1.1e+06" },

  { -1000001.0, "%.1e", "-1.1e+06", "-1.0e+06", "-1.0e+06", "-1.0e+06" },

};

static int

test_dec_in_one_mode (double d, const char *fmt, const char *expected,

		      const char *mode_name)

{

  char buf[100];

  int ret = snprintf (buf, sizeof buf, fmt, d);

  if (ret <= 0 || ret >= (int) sizeof buf)

    {

      printf ("snprintf for %a returned %d\n", d, ret);

      return 1;

    }

  if (strcmp (buf, expected) == 0)

    return 0;

  else

    {

      printf ("snprintf (\"%s\", %a) returned \"%s\" not \"%s\" (%s)\n",

	      fmt, d, buf, expected, mode_name);

      return 1;

    }

}

struct hex_test

{

  double d;

  const char *fmt;

  const char *rd[4], *rn[4], *rz[4], *ru[4];

};

static const struct hex_test hex_tests[] =

  {

    {

      0x1.fffffp+4, "%.1a",

      { "0x1.fp+4", "0x3.fp+3", "0x7.fp+2", "0xf.fp+1" },

      { "0x2.0p+4", "0x4.0p+3", "0x8.0p+2", "0x1.0p+5" },

      { "0x1.fp+4", "0x3.fp+3", "0x7.fp+2", "0xf.fp+1" },

      { "0x2.0p+4", "0x4.0p+3", "0x8.0p+2", "0x1.0p+5" }

    },

    {

      -0x1.fffffp+4, "%.1a",

      { "-0x2.0p+4", "-0x4.0p+3", "-0x8.0p+2", "-0x1.0p+5" },

      { "-0x2.0p+4", "-0x4.0p+3", "-0x8.0p+2", "-0x1.0p+5" },

      { "-0x1.fp+4", "-0x3.fp+3", "-0x7.fp+2", "-0xf.fp+1" },

      { "-0x1.fp+4", "-0x3.fp+3", "-0x7.fp+2", "-0xf.fp+1" }

    },

    {

      0x1.88p+4, "%.1a",

      { "0x1.8p+4", "0x3.1p+3", "0x6.2p+2", "0xc.4p+1" },

      { "0x1.8p+4", "0x3.1p+3", "0x6.2p+2", "0xc.4p+1" },

      { "0x1.8p+4", "0x3.1p+3", "0x6.2p+2", "0xc.4p+1" },

      { "0x1.9p+4", "0x3.1p+3", "0x6.2p+2", "0xc.4p+1" }

    },

    {

      -0x1.88p+4, "%.1a",

      { "-0x1.9p+4", "-0x3.1p+3", "-0x6.2p+2", "-0xc.4p+1" },

      { "-0x1.8p+4", "-0x3.1p+3", "-0x6.2p+2", "-0xc.4p+1" },

      { "-0x1.8p+4", "-0x3.1p+3", "-0x6.2p+2", "-0xc.4p+1" },

      { "-0x1.8p+4", "-0x3.1p+3", "-0x6.2p+2", "-0xc.4p+1" }

    },

    {

      0x1.78p+4, "%.1a",

      { "0x1.7p+4", "0x2.fp+3", "0x5.ep+2", "0xb.cp+1" },

      { "0x1.8p+4", "0x2.fp+3", "0x5.ep+2", "0xb.cp+1" },

      { "0x1.7p+4", "0x2.fp+3", "0x5.ep+2", "0xb.cp+1" },

      { "0x1.8p+4", "0x2.fp+3", "0x5.ep+2", "0xb.cp+1" }

    },

    {

      -0x1.78p+4, "%.1a",

      { "-0x1.8p+4", "-0x2.fp+3", "-0x5.ep+2", "-0xb.cp+1" },

      { "-0x1.8p+4", "-0x2.fp+3", "-0x5.ep+2", "-0xb.cp+1" },

      { "-0x1.7p+4", "-0x2.fp+3", "-0x5.ep+2", "-0xb.cp+1" },

      { "-0x1.7p+4", "-0x2.fp+3", "-0x5.ep+2", "-0xb.cp+1" }

    },

    {

      64.0 / 3.0, "%.1a",

      { "0x1.5p+4", "0x2.ap+3", "0x5.5p+2", "0xa.ap+1" },

      { "0x1.5p+4", "0x2.bp+3", "0x5.5p+2", "0xa.bp+1" },

      { "0x1.5p+4", "0x2.ap+3", "0x5.5p+2", "0xa.ap+1" },

      { "0x1.6p+4", "0x2.bp+3", "0x5.6p+2", "0xa.bp+1" }

    },

    {

      -64.0 / 3.0, "%.1a",

      { "-0x1.6p+4", "-0x2.bp+3", "-0x5.6p+2", "-0xa.bp+1" },

      { "-0x1.5p+4", "-0x2.bp+3", "-0x5.5p+2", "-0xa.bp+1" },

      { "-0x1.5p+4", "-0x2.ap+3", "-0x5.5p+2", "-0xa.ap+1" },

      { "-0x1.5p+4", "-0x2.ap+3", "-0x5.5p+2", "-0xa.ap+1" }

    },

  };

static int

test_hex_in_one_mode (double d, const char *fmt, const char *const expected[4],

		      const char *mode_name)

{

  char buf[100];

  int ret = snprintf (buf, sizeof buf, fmt, d);

  if (ret <= 0 || ret >= (int) sizeof buf)

    {

      printf ("snprintf for %a returned %d\n", d, ret);

      return 1;

    }

  if (strcmp (buf, expected[0]) == 0

      || strcmp (buf, expected[1]) == 0

      || strcmp (buf, expected[2]) == 0

      || strcmp (buf, expected[3]) == 0)

    return 0;

  else

    {

      printf ("snprintf (\"%s\", %a) returned \"%s\" not "

	      "\"%s\" or \"%s\" or \"%s\" or \"%s\" (%s)\n",

	      fmt, d, buf, expected[0], expected[1], expected[2], expected[3],

	      mode_name);

      return 1;

    }

}

static int

do_test (void)

{

  int save_round_mode __attribute__ ((unused)) = fegetround ();

  int result = 0;

  for (size_t i = 0; i < array_length (dec_tests); i++)

    {

      result |= test_dec_in_one_mode (dec_tests[i].d, dec_tests[i].fmt,

				      dec_tests[i].rn, "default rounding mode");

#ifdef FE_DOWNWARD

      if (!fesetround (FE_DOWNWARD))

	{

	  result |= test_dec_in_one_mode (dec_tests[i].d, dec_tests[i].fmt,

					  dec_tests[i].rd, "FE_DOWNWARD");

	  fesetround (save_round_mode);

	}

#endif

#ifdef FE_TOWARDZERO

      if (!fesetround (FE_TOWARDZERO))

	{

	  result |= test_dec_in_one_mode (dec_tests[i].d, dec_tests[i].fmt,

					  dec_tests[i].rz, "FE_TOWARDZERO");

	  fesetround (save_round_mode);

	}

#endif

#ifdef FE_UPWARD

      if (!fesetround (FE_UPWARD))

	{

	  result |= test_dec_in_one_mode (dec_tests[i].d, dec_tests[i].fmt,

					  dec_tests[i].ru, "FE_UPWARD");

	  fesetround (save_round_mode);

	}

#endif

    }

  for (size_t i = 0; i < array_length (hex_tests); i++)

    {

      result |= test_hex_in_one_mode (hex_tests[i].d, hex_tests[i].fmt,

				      hex_tests[i].rn, "default rounding mode");

#ifdef FE_DOWNWARD

      if (!fesetround (FE_DOWNWARD))

	{

	  result |= test_hex_in_one_mode (hex_tests[i].d, hex_tests[i].fmt,

					  hex_tests[i].rd, "FE_DOWNWARD");

	  fesetround (save_round_mode);

	}

#endif

#ifdef FE_TOWARDZERO

      if (!fesetround (FE_TOWARDZERO))

	{

	  result |= test_hex_in_one_mode (hex_tests[i].d, hex_tests[i].fmt,

					  hex_tests[i].rz, "FE_TOWARDZERO");

	  fesetround (save_round_mode);

	}

#endif

#ifdef FE_UPWARD

      if (!fesetround (FE_UPWARD))

	{

	  result |= test_hex_in_one_mode (hex_tests[i].d, hex_tests[i].fmt,

					  hex_tests[i].ru, "FE_UPWARD");

	  fesetround (save_round_mode);

	}

#endif

    }

  return result;

}

#define TEST_FUNCTION do_test ()

#include "../test-skeleton.c"