/* Copyright © 2018, Keith Packard
   All rights reserved.

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions are met:

   * Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.
   * Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the
     distribution.
   * Neither the name of the copyright holders nor the names of
     contributors may be used to endorse or promote products derived
     from this software without specific prior written permission.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  POSSIBILITY OF SUCH DAMAGE. */

#include "dtoa_engine.h"

#ifndef DBL_MAX_10_EXP
#error DBL_MAX_10_EXP
#endif

#ifndef DBL_MIN_10_EXP
#error DBL_MIN_10_EXP
#endif

#ifndef DBL_DIG
#error DBL_DIG
#endif

const double __dtoa_scale_up[] = {
#if DBL_MAX_10_EXP >= 1
	1e1,
#endif
#if DBL_MAX_10_EXP >= 2
	1e2,
#endif
#if DBL_MAX_10_EXP >= 4
	1e4,
#endif
#if DBL_MAX_10_EXP >= 8
	1e8,
#endif
#if DBL_MAX_10_EXP >= 16
	1e16,
#endif
#if DBL_MAX_10_EXP >= 32
	1e32,
#endif
#if DBL_MAX_10_EXP >= 64
	1e64,
#endif
#if DBL_MAX_10_EXP >= 128
	1e128,
#endif
#if DBL_MAX_10_EXP >= 256
	1e256,
#endif
#if DBL_MAX_10_EXP >= 512
	1e512,
#endif
#if DBL_MAX_10_EXP >= 1024
	1e1024,
#endif
#if DBL_MAX_10_EXP >= 2048
	1e2048,
#endif
#if DBL_MAX_10_EXP >= 4096
	1e4096,
#endif
#if DBL_MAX_10_EXP >= 8192
	1e8192,
#endif
#if DBL_MAX_10_EXP >= 16384
	1e16384,
#endif
#if DBL_MAX_10_EXP >= 32768
	1e32768,
#endif
#if DBL_MAX_10_EXP >= 65536
	1e65536,
#endif
};

const double __dtoa_scale_down[] = {
#if DBL_MIN_10_EXP <= -1
	1e-1,
#endif
#if DBL_MIN_10_EXP <= -2
	1e-2,
#endif
#if DBL_MIN_10_EXP <= -4
	1e-4,
#endif
#if DBL_MIN_10_EXP <= -8
	1e-8,
#endif
#if DBL_MIN_10_EXP <= -16
	1e-16,
#endif
#if DBL_MIN_10_EXP <= -32
	1e-32,
#endif
#if DBL_MIN_10_EXP <= -64
	1e-64,
#endif
#if DBL_MIN_10_EXP <= -128
	1e-128,
#endif
#if DBL_MIN_10_EXP <= -256
	1e-256,
#endif
#if DBL_MIN_10_EXP <= -512
	1e-512,
#endif
#if DBL_MIN_10_EXP <= -1024
	1e-1024,
#endif
#if DBL_MIN_10_EXP <= -2048
	1e-2048,
#endif
#if DBL_MIN_10_EXP <= -4096
	1e-4096,
#endif
#if DBL_MIN_10_EXP <= -8192
	1e-8192,
#endif
#if DBL_MIN_10_EXP <= -16384
	1e-16384,
#endif
#if DBL_MIN_10_EXP <= -32768
	1e-32768,
#endif
#if DBL_MIN_10_EXP <= -65536
	1e-65536,
#endif
};

const double __dtoa_round[] = {
#if DBL_DIG >= 30
	5e30,
#endif
#if DBL_DIG >= 29
	5e29,
#endif
#if DBL_DIG >= 28
	5e28,
#endif
#if DBL_DIG >= 27
	5e27,
#endif
#if DBL_DIG >= 26
	5e26,
#endif
#if DBL_DIG >= 25
	5e25,
#endif
#if DBL_DIG >= 24
	5e24,
#endif
#if DBL_DIG >= 23
	5e23,
#endif
#if DBL_DIG >= 22
	5e22,
#endif
#if DBL_DIG >= 21
	5e21,
#endif
#if DBL_DIG >= 20
	5e20,
#endif
#if DBL_DIG >= 19
	5e19,
#endif
#if DBL_DIG >= 18
	5e18,
#endif
#if DBL_DIG >= 17
	5e17,
#endif
#if DBL_DIG >= 16
	5e16,
#endif
#if DBL_DIG >= 15
	5e15,
#endif
#if DBL_DIG >= 14
	5e14,
#endif
#if DBL_DIG >= 13
	5e13,
#endif
#if DBL_DIG >= 12
	5e12,
#endif
#if DBL_DIG >= 11
	5e11,
#endif
#if DBL_DIG >= 10
	5e10,
#endif
#if DBL_DIG >= 9
	5e9,
#endif
#if DBL_DIG >= 8
	5e8,
#endif
#if DBL_DIG >= 7
	5e7,
#endif
#if DBL_DIG >= 6
	5e6,
#endif
#if DBL_DIG >= 5
	5e5,
#endif
#if DBL_DIG >= 4
	5e4,
#endif
#if DBL_DIG >= 3
	5e3,
#endif
#if DBL_DIG >= 2
	5e2,
#endif
#if DBL_DIG >= 1
	5e1,
#endif
#if DBL_DIG >= 0
	5e0,
#endif
};

/*
 * Make sure the computed sizes of the arrays match the actual sizes
 * by declaring an array which is legal if the sizes match and illegal
 * if they do not
 */

#define count_of(n)	(sizeof (n) / sizeof (n[0]))
#define match(array,size)	(count_of(array) == size)
#define check_match(array,size)	(match(array, size) ? 1 : -1)

typedef struct {
	int	check_up[check_match(__dtoa_scale_up, DTOA_SCALE_UP_NUM)];
	int	check_down[check_match(__dtoa_scale_down, DTOA_SCALE_DOWN_NUM)];
	int	check_round[check_match(__dtoa_round, DTOA_ROUND_NUM)];
} check_sizes;
