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nuttx/libs/libc/stdio/lib_dtoa_engine.h

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libs/libc/stdio: Add newlib-nano fprintf as an option. This fprintf code was originally adapted from AVR libc and provides improved floating point output support, including 'g' mode and making 'f' mode include digits past the decimal by default. However, this version does not have any long long support. On a demonstration cortex M4 build, this version saves about 5kB of ROM. The newlib version can be found here: https://salsa.debian.org/electronics-team/toolchains/newlib-nano . That project is GPL overall, but the newlib-nano printf portions are BSD licensed as described in the COPYING.NEWLIB file.
2019-02-06 22:50:52 +01:00
/****************************************************************************
libs/libc/stdio: Rename all nano_*.c and nano_*.h files to lib_*.c and lib_*.h to emphasize that these are now the defaults, not an optional implementation.
2019-02-17 19:16:28 +01:00
* libs/libc/stdio/lib_dtoa_engine.h
libs/libc/stdio: Add newlib-nano fprintf as an option. This fprintf code was originally adapted from AVR libc and provides improved floating point output support, including 'g' mode and making 'f' mode include digits past the decimal by default. However, this version does not have any long long support. On a demonstration cortex M4 build, this version saves about 5kB of ROM. The newlib version can be found here: https://salsa.debian.org/electronics-team/toolchains/newlib-nano . That project is GPL overall, but the newlib-nano printf portions are BSD licensed as described in the COPYING.NEWLIB file.
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*
* 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.
*
****************************************************************************/
libs/libc/stdio: Rename all nano_*.c and nano_*.h files to lib_*.c and lib_*.h to emphasize that these are now the defaults, not an optional implementation.
2019-02-17 19:16:28 +01:00
#ifndef __LIBS_LIBC_STDIO_LIB_DTOA_ENGINE_H
#define __LIBS_LIBC_STDIO_LIB_DTOA_ENGINE_H
libs/libc/stdio: Add newlib-nano fprintf as an option. This fprintf code was originally adapted from AVR libc and provides improved floating point output support, including 'g' mode and making 'f' mode include digits past the decimal by default. However, this version does not have any long long support. On a demonstration cortex M4 build, this version saves about 5kB of ROM. The newlib version can be found here: https://salsa.debian.org/electronics-team/toolchains/newlib-nano . That project is GPL overall, but the newlib-nano printf portions are BSD licensed as described in the COPYING.NEWLIB file.
2019-02-06 22:50:52 +01:00
/****************************************************************************
* Included Files
****************************************************************************/
libc: Move double_t typedef from sys/types.h to math.h specified here: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/math.h.html Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com> Change-Id: I3497a73908301d999cf1cfc4a66552a7ca4868c6
2020-06-28 08:04:30 +02:00
#include <math.h>
libs/libc/stdio: Add newlib-nano fprintf as an option. This fprintf code was originally adapted from AVR libc and provides improved floating point output support, including 'g' mode and making 'f' mode include digits past the decimal by default. However, this version does not have any long long support. On a demonstration cortex M4 build, this version saves about 5kB of ROM. The newlib version can be found here: https://salsa.debian.org/electronics-team/toolchains/newlib-nano . That project is GPL overall, but the newlib-nano printf portions are BSD licensed as described in the COPYING.NEWLIB file.
2019-02-06 22:50:52 +01:00
#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
****************************************************************************/
libs/libc/stdio: A few more coding standard fixes for nano-printf file: all global data names must begin with g_. All structure names must end with _s.
2019-02-07 00:05:01 +01:00
struct dtoa_s
libs/libc/stdio: Add newlib-nano fprintf as an option. This fprintf code was originally adapted from AVR libc and provides improved floating point output support, including 'g' mode and making 'f' mode include digits past the decimal by default. However, this version does not have any long long support. On a demonstration cortex M4 build, this version saves about 5kB of ROM. The newlib version can be found here: https://salsa.debian.org/electronics-team/toolchains/newlib-nano . That project is GPL overall, but the newlib-nano printf portions are BSD licensed as described in the COPYING.NEWLIB file.
2019-02-06 22:50:52 +01:00
{
int32_t exp;
uint8_t flags;
char digits[DTOA_MAX_DIG + 1];
};
/****************************************************************************
* Public Data
****************************************************************************/
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>
2020-07-25 17:25:06 +02:00
extern const double g_dtoa_scale_up[];
extern const double g_dtoa_scale_down[];
extern const double g_dtoa_round[];
libs/libc/stdio: Add newlib-nano fprintf as an option. This fprintf code was originally adapted from AVR libc and provides improved floating point output support, including 'g' mode and making 'f' mode include digits past the decimal by default. However, this version does not have any long long support. On a demonstration cortex M4 build, this version saves about 5kB of ROM. The newlib version can be found here: https://salsa.debian.org/electronics-team/toolchains/newlib-nano . That project is GPL overall, but the newlib-nano printf portions are BSD licensed as described in the COPYING.NEWLIB file.
2019-02-06 22:50:52 +01:00
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
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>
2020-07-25 17:25:06 +02:00
int __dtoa_engine(double x, FAR struct dtoa_s *dtoa, int max_digits,
libs/libc/stdio: Add newlib-nano fprintf as an option. This fprintf code was originally adapted from AVR libc and provides improved floating point output support, including 'g' mode and making 'f' mode include digits past the decimal by default. However, this version does not have any long long support. On a demonstration cortex M4 build, this version saves about 5kB of ROM. The newlib version can be found here: https://salsa.debian.org/electronics-team/toolchains/newlib-nano . That project is GPL overall, but the newlib-nano printf portions are BSD licensed as described in the COPYING.NEWLIB file.
2019-02-06 22:50:52 +01:00
int max_decimals);
libs/libc/stdio: Rename all nano_*.c and nano_*.h files to lib_*.c and lib_*.h to emphasize that these are now the defaults, not an optional implementation.
2019-02-17 19:16:28 +01:00
#endif /* __LIBS_LIBC_STDIO_LIB_DTOA_ENGINE_H */
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