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nuttx/libs/libc/stdio/lib_dtoa_engine.h
ligd c11c1dc8fd libs/libc/stdio: replace double_t to double 
Modify reason:

When build Nuttx SIM, in x86_64 system:

Compile with gcc option '-m64' (default):
sizeof(double_t) = 8
sizeof(double)   = 8

Compile with gcc option '-mx32':
sizeof(double_t) = 8
sizeof(double)   = 8

Compile with gcc option '-m32':
sizeof(double_t) = 12       // long double
sizeof(double)   = 8

When use '-m32', and print sth. like this:
printf("%f\n", (double)3.0);
SIM will print out: nan

This is because sizeof(double_t) is not equal with double.

Resolve:
replace all double_t to double in libs/libc/stdio.

As a user of '-m32', you should know double_t is one type
long double, and len is 12. And you use use '%lf' to print.
like:
printf("%lf\n", (double_t)3.0);

Currently we don't support '%lf'.

Change-Id: I9b9d11853140d5296dd80416c8ed6a260a9d2d9c
Signed-off-by: ligd <liguiding1@xiaomi.com>
2020-09-15 14:42:36 +08:00

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/****************************************************************************
* libs/libc/stdio/lib_dtoa_engine.h
*
* 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:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name NuttX nor the names of its 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.
*
****************************************************************************/
#ifndef __LIBS_LIBC_STDIO_LIB_DTOA_ENGINE_H
#define __LIBS_LIBC_STDIO_LIB_DTOA_ENGINE_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <math.h>
#include <stdint.h>
#include <float.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define DTOA_MAX_DIG DBL_DIG
#define DTOA_MINUS 1
#define DTOA_ZERO 2
#define DTOA_INF 4
#define DTOA_NAN 8
#define DTOA_CARRY 16 /* Carry was to master position. */
#if DBL_MAX_10_EXP >= 1 && DBL_MAX_10_EXP < 2
# define DTOA_SCALE_UP_NUM 1
#endif
#if DBL_MAX_10_EXP >= 2 && DBL_MAX_10_EXP < 4
# define DTOA_SCALE_UP_NUM 2
#endif
#if DBL_MAX_10_EXP >= 4 && DBL_MAX_10_EXP < 8
# define DTOA_SCALE_UP_NUM 3
#endif
#if DBL_MAX_10_EXP >= 8 && DBL_MAX_10_EXP < 16
# define DTOA_SCALE_UP_NUM 4
#endif
#if DBL_MAX_10_EXP >= 16 && DBL_MAX_10_EXP < 32
# define DTOA_SCALE_UP_NUM 5
#endif
#if DBL_MAX_10_EXP >= 32 && DBL_MAX_10_EXP < 64
# define DTOA_SCALE_UP_NUM 6
#endif
#if DBL_MAX_10_EXP >= 64 && DBL_MAX_10_EXP < 128
# define DTOA_SCALE_UP_NUM 7
#endif
#if DBL_MAX_10_EXP >= 128 && DBL_MAX_10_EXP < 256
# define DTOA_SCALE_UP_NUM 8
#endif
#if DBL_MAX_10_EXP >= 256 && DBL_MAX_10_EXP < 512
# define DTOA_SCALE_UP_NUM 9
#endif
#if DBL_MAX_10_EXP >= 512 && DBL_MAX_10_EXP < 1024
# define DTOA_SCALE_UP_NUM 10
#endif
#if DBL_MAX_10_EXP >= 1024 && DBL_MAX_10_EXP < 2048
# define DTOA_SCALE_UP_NUM 11
#endif
#if DBL_MAX_10_EXP >= 2048 && DBL_MAX_10_EXP < 4096
# define DTOA_SCALE_UP_NUM 12
#endif
#if DBL_MAX_10_EXP >= 4096 && DBL_MAX_10_EXP < 8192
# define DTOA_SCALE_UP_NUM 13
#endif
#if DBL_MAX_10_EXP >= 8192 && DBL_MAX_10_EXP < 16384
# define DTOA_SCALE_UP_NUM 14
#endif
#if DBL_MAX_10_EXP >= 16384 && DBL_MAX_10_EXP < 32768
# define DTOA_SCALE_UP_NUM 15
#endif
#if DBL_MAX_10_EXP >= 32768 && DBL_MAX_10_EXP < 65536
# define DTOA_SCALE_UP_NUM 16
#endif
#if DBL_MAX_10_EXP >= 65536 && DBL_MAX_10_EXP < 131072
# define DTOA_SCALE_UP_NUM 17
#endif
#if DBL_MIN_10_EXP <= -1 && DBL_MIN_10_EXP > -2
# define DTOA_SCALE_DOWN_NUM 1
#endif
#if DBL_MIN_10_EXP <= -2 && DBL_MIN_10_EXP > -4
# define DTOA_SCALE_DOWN_NUM 2
#endif
#if DBL_MIN_10_EXP <= -4 && DBL_MIN_10_EXP > -8
# define DTOA_SCALE_DOWN_NUM 3
#endif
#if DBL_MIN_10_EXP <= -8 && DBL_MIN_10_EXP > -16
# define DTOA_SCALE_DOWN_NUM 4
#endif
#if DBL_MIN_10_EXP <= -16 && DBL_MIN_10_EXP > -32
# define DTOA_SCALE_DOWN_NUM 5
#endif
#if DBL_MIN_10_EXP <= -32 && DBL_MIN_10_EXP > -64
# define DTOA_SCALE_DOWN_NUM 6
#endif
#if DBL_MIN_10_EXP <= -64 && DBL_MIN_10_EXP > -128
# define DTOA_SCALE_DOWN_NUM 7
#endif
#if DBL_MIN_10_EXP <= -128 && DBL_MIN_10_EXP > -256
# define DTOA_SCALE_DOWN_NUM 8
#endif
#if DBL_MIN_10_EXP <= -256 && DBL_MIN_10_EXP > -512
# define DTOA_SCALE_DOWN_NUM 9
#endif
#if DBL_MIN_10_EXP <= -512 && DBL_MIN_10_EXP > -1024
# define DTOA_SCALE_DOWN_NUM 10
#endif
#if DBL_MIN_10_EXP <= -1024 && DBL_MIN_10_EXP > -2048
# define DTOA_SCALE_DOWN_NUM 11
#endif
#if DBL_MIN_10_EXP <= -2048 && DBL_MIN_10_EXP > -4096
# define DTOA_SCALE_DOWN_NUM 12
#endif
#if DBL_MIN_10_EXP <= -4096 && DBL_MIN_10_EXP > -8192
# define DTOA_SCALE_DOWN_NUM 13
#endif
#if DBL_MIN_10_EXP <= -8192 && DBL_MIN_10_EXP > -16384
# define DTOA_SCALE_DOWN_NUM 14
#endif
#if DBL_MIN_10_EXP <= -16384 && DBL_MIN_10_EXP > -32768
# define DTOA_SCALE_DOWN_NUM 15
#endif
#if DBL_MIN_10_EXP <= -32768 && DBL_MIN_10_EXP > -65536
# define DTOA_SCALE_DOWN_NUM 16
#endif
#if DBL_MIN_10_EXP <= -65536 && DBL_MIN_10_EXP > -131072
# define DTOA_SCALE_DOWN_NUM 17
#endif
#define DTOA_ROUND_NUM (DBL_DIG + 1)
/****************************************************************************
* Public Types
****************************************************************************/
struct dtoa_s
{
int32_t exp;
uint8_t flags;
char digits[DTOA_MAX_DIG + 1];
};
/****************************************************************************
* Public Data
****************************************************************************/
extern const double g_dtoa_scale_up[];
extern const double g_dtoa_scale_down[];
extern const double g_dtoa_round[];
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
int __dtoa_engine(double x, FAR struct dtoa_s *dtoa, int max_digits,
int max_decimals);
#endif /* __LIBS_LIBC_STDIO_LIB_DTOA_ENGINE_H */
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