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add function for strtof

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This commit is contained in:
lilei19 2023-01-12 18:54:53 +08:00 committed by Xiang Xiao
parent 674b480198
commit 120594079a
5 changed files with 749 additions and 922 deletions
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1
LICENSE
View File

@ -5891,6 +5891,7 @@ POSSIBILITY OF SUCH DAMAGE.
libs/libc/math/scalbnf.c
libs/libc/math/scalbn.c
libs/libc/math/scalbnl.c
libs/libc/stdlib/lib_strtof.c
======================
Copyright © 2005-2020 Rich Felker, et al.

4
libs/libc/stdlib/Make.defs
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@ -24,8 +24,8 @@ CSRCS += lib_abs.c lib_abort.c lib_atof.c lib_atoi.c lib_getprogname.c
CSRCS += lib_atol.c lib_atoll.c lib_div.c lib_ldiv.c lib_lldiv.c lib_exit.c
CSRCS += lib_itoa.c lib_labs.c lib_llabs.c lib_realpath.c lib_bsearch.c
CSRCS += lib_rand.c lib_rand48.c lib_qsort.c lib_srand.c lib_strtol.c
CSRCS += lib_strtoll.c lib_strtoul.c lib_strtoull.c lib_strtod.c lib_strtof.c
CSRCS += lib_strtold.c lib_checkbase.c lib_mktemp.c lib_mkstemp.c lib_mkdtemp.c
CSRCS += lib_strtoll.c lib_strtoul.c lib_strtoull.c lib_strtold.c
CSRCS += lib_checkbase.c lib_mktemp.c lib_mkstemp.c lib_mkdtemp.c
CSRCS += lib_aligned_alloc.c lib_posix_memalign.c lib_valloc.c lib_mblen.c
CSRCS += lib_mbtowc.c lib_wctomb.c lib_mbstowcs.c lib_wcstombs.c
CSRCS += lib_atexit.c lib_cxa_atexit.c lib_onexit.c

343
libs/libc/stdlib/lib_strtod.c
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@ -1,343 +0,0 @@
/****************************************************************************
* libs/libc/stdlib/lib_strtod.c
* Convert string to double
*
* Copyright (C) 2002 Michael Ringgaard. All rights reserved.
* Copyright (C) 2006-2007 H. Peter Anvin.
*
* 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 of the project 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <nuttx/compiler.h>
#include <stdlib.h>
#include <ctype.h>
#include <errno.h>
#include <stdbool.h>
#ifdef CONFIG_HAVE_DOUBLE
/****************************************************************************
* Pre-processor definitions
****************************************************************************/
/* These are predefined with GCC, but could be issues for other compilers. If
* not defined, an arbitrary big number is put in for now. These should be
* added to nuttx/compiler for your compiler.
*/
#if !defined(__DBL_MIN_EXP__) || !defined(__DBL_MAX_EXP__)
# ifdef CONFIG_CPP_HAVE_WARNING
# warning "Size of exponent is unknown"
# endif
# undef __DBL_MIN_EXP__
# define __DBL_MIN_EXP__ (-1021)
# undef __DBL_MAX_EXP__
# define __DBL_MAX_EXP__ (1024)
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
static inline int is_real(double x)
{
/* NOTE: Windows MSVC restrictions, MSVC doesn't allow division through a
* zero literal, but allows it through non-const variable set to zero
*/
const double divzero = 0.0;
const double infinite = 1.0 / divzero;
return (x < infinite) && (x >= -infinite);
}
static bool chtod(char c, double base, FAR double *number)
{
/* This function is to determine if c is keyword
* Then set number + base
*/
double tmp = base;
if (isdigit(c))
{
tmp = c - '0';
}
else if (c >= 'a' && c <= 'f')
{
tmp = c - 'a' + 10;
}
else if (c >= 'A' && c <= 'F')
{
tmp = c - 'A' + 10;
}
if (tmp >= base)
{
return false;
}
*number = *number * base + tmp;
return true;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: strtod
*
* Description:
* Convert a string to a double value
*
* NOTE: This implementation is limited as compared to POSIX:
* - Hexadecimal input is not supported
* - INF, INFINITY, NAN, and NAN(...) are not supported
*
****************************************************************************/
double strtod(FAR const char *str, FAR char **endptr)
{
double number;
int exponent;
int negative;
FAR char *p = (FAR char *) str;
double p10;
int n;
int num_digits;
int num_decimals;
/* NOTE: Windows MSVC restrictions, MSVC doesn't allow division through a
* zero literal, but allows it through non-const variable set to zero
*/
const double divzero = 0.0;
const double infinite = 1.0 / divzero;
/* Skip leading whitespace */
while (isspace(*p))
{
p++;
}
/* Handle optional sign */
negative = 0;
switch (*p)
{
case '-':
negative = 1; /* Fall through to increment position */
/* FALLTHROUGH */
case '+':
p++;
/* FALLTHROUGH */
default:
break;
}
p10 = 10.;
number = 0.;
exponent = 0;
num_digits = 0;
num_decimals = 0;
/* Process optional 0x prefix */
if (*p == '0' && tolower(*(p + 1)) == 'x')
{
p += 2;
p10 = 16.;
}
/* Process string of digits */
while (chtod(*p, p10, &number))
{
p++;
num_digits++;
}
/* Process decimal part */
if (*p == '.')
{
p++;
while (chtod(*p, p10, &number))
{
p++;
num_digits++;
num_decimals++;
}
exponent -= num_decimals;
}
if (num_digits == 0)
{
set_errno(ERANGE);
number = 0.0;
p = (FAR char *)str;
goto errout;
}
/* Correct for sign */
if (negative)
{
number = -number;
}
/* Process an exponent string */
if ((p10 == 10. && (*p == 'e' || *p == 'E'))
|| (p10 == 16. && (*p == 'p' || *p == 'P')))
{
/* if the Hexadecimal system */
if (p10 == 16.)
{
exponent *= 4;
p10 = 2.0;
}
/* Handle optional sign */
negative = 0;
switch (*++p)
{
case '-':
negative = 1; /* Fall through to increment pos */
/* FALLTHROUGH */
case '+':
p++;
/* FALLTHROUGH */
default:
break;
}
/* Process string of digits */
if (!isdigit(*p))
{
set_errno(ERANGE);
number = 0.0;
p = (FAR char *)str;
goto errout;
}
n = 0;
while (isdigit(*p))
{
n = n * 10 + (*p - '0');
p++;
}
if (negative)
{
exponent -= n;
}
else
{
exponent += n;
}
}
if (exponent < __DBL_MIN_EXP__ ||
exponent > __DBL_MAX_EXP__)
{
set_errno(ERANGE);
if (exponent < __DBL_MIN_EXP__)
{
number = divzero;
}
else
{
number = infinite;
}
goto errout;
}
/* Scale the result */
n = exponent;
if (n < 0)
{
n = -n;
}
while (n)
{
if (n & 1)
{
if (exponent < 0)
{
number /= p10;
}
else
{
number *= p10;
}
}
n >>= 1;
p10 *= p10;
}
if (!is_real(number))
{
set_errno(ERANGE);
}
errout:
if (endptr)
{
*endptr = p;
}
return number;
}
#endif /* CONFIG_HAVE_DOUBLE */

343
libs/libc/stdlib/lib_strtof.c
View File

@ -1,343 +0,0 @@
/****************************************************************************
* libs/libc/stdlib/lib_strtof.c
* Convert string to float
*
* Copyright (C) 2016 Gregory Nutt. All rights reserved.
*
* A pretty straight forward conversion fo strtod():
*
* Copyright (C) 2002 Michael Ringgaard. All rights reserved.
* Copyright (C) 2006-2007 H. Peter Anvin.
*
* 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 of the project 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <nuttx/compiler.h>
#include <stdlib.h>
#include <ctype.h>
#include <errno.h>
#include <stdbool.h>
/****************************************************************************
* Pre-processor definitions
****************************************************************************/
/* These are predefined with GCC, but could be issues for other compilers. If
* not defined, an arbitrary big number is put in for now. These should be
* added to nuttx/compiler for your compiler.
*/
#if !defined(__FLT_MIN_EXP__) || !defined(__FLT_MAX_EXP__)
# ifdef CONFIG_CPP_HAVE_WARNING
# warning "Size of exponent is unknown"
# endif
# undef __FLT_MIN_EXP__
# define __FLT_MIN_EXP__ (-125)
# undef __FLT_MAX_EXP__
# define __FLT_MAX_EXP__ (128)
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
static inline int is_real(float x)
{
/* NOTE: Windows MSVC restrictions, MSVC doesn't allow division through a
* zero literal, but allows it through non-const variable set to zero
*/
float divzero = 0.0F;
const float infinite = 1.0F / divzero;
return (x < infinite) && (x >= -infinite);
}
static bool chtof(char c, float base, FAR float *number)
{
/* This function is to determine if c is keyword
* Then set number + base
*/
float tmp = base;
if (isdigit(c))
{
tmp = c - '0';
}
else if (c >= 'a' && c <= 'f')
{
tmp = c - 'a' + 10;
}
else if (c >= 'A' && c <= 'F')
{
tmp = c - 'A' + 10;
}
if (tmp >= base)
{
return false;
}
*number = *number * base + tmp;
return true;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: strtof
*
* Description:
* Convert a string to a float value
*
* NOTE: This implementation is limited as compared to POSIX:
* - Hexadecimal input is not supported
* - INF, INFINITY, NAN, and NAN(...) are not supported
*
****************************************************************************/
float strtof(FAR const char *str, FAR char **endptr)
{
float number;
int exponent;
int negative;
FAR char *p = (FAR char *) str;
float p10;
int n;
int num_digits;
int num_decimals;
/* NOTE: Windows MSVC restrictions, MSVC doesn't allow division through a
* zero literal, but allows it through non-const variable set to zero
*/
float divzero = 0.0F;
const float infinite = 1.0F / divzero;
/* Skip leading whitespace */
while (isspace(*p))
{
p++;
}
/* Handle optional sign */
negative = 0;
switch (*p)
{
case '-':
negative = 1; /* Fall through to increment position */
/* FALLTHROUGH */
case '+':
p++;
/* FALLTHROUGH */
default:
break;
}
p10 = 10.0f;
number = 0.0F;
exponent = 0;
num_digits = 0;
num_decimals = 0;
/* Process optional 0x prefix */
if (*p == '0' && tolower(*(p + 1)) == 'x')
{
p += 2;
p10 = 16.0f;
}
/* Process string of digits */
while (chtof(*p, p10, &number))
{
p++;
num_digits++;
}
/* Process decimal part */
if (*p == '.')
{
p++;
while (chtof(*p, p10, &number))
{
p++;
num_digits++;
num_decimals++;
}
exponent -= num_decimals;
}
if (num_digits == 0)
{
set_errno(ERANGE);
number = 0.0F;
p = (FAR char *)str;
goto errout;
}
/* Correct for sign */
if (negative)
{
number = -number;
}
/* Process an exponent string */
if ((p10 == 10.0f && (*p == 'e' || *p == 'E'))
|| (p10 == 16.0f && (*p == 'p' || *p == 'P')))
{
/* if the Hexadecimal system */
if (p10 == 16.0f)
{
exponent *= 4;
p10 = 2.0f;
}
/* Handle optional sign */
negative = 0;
switch (*++p)
{
case '-':
negative = 1; /* Fall through to increment pos */
/* FALLTHROUGH */
case '+':
p++;
/* FALLTHROUGH */
default:
break;
}
/* Process string of digits */
if (!isdigit(*p))
{
set_errno(ERANGE);
number = 0.0F;
p = (FAR char *)str;
goto errout;
}
n = 0;
while (isdigit(*p))
{
n = n * 10 + (*p - '0');
p++;
}
if (negative)
{
exponent -= n;
}
else
{
exponent += n;
}
}
if (exponent < __FLT_MIN_EXP__ ||
exponent > __FLT_MAX_EXP__)
{
set_errno(ERANGE);
if (exponent < __FLT_MIN_EXP__)
{
number = divzero;
}
else
{
number = infinite;
}
goto errout;
}
/* Scale the result */
n = exponent;
if (n < 0)
{
n = -n;
}
while (n)
{
if (n & 1)
{
if (exponent < 0)
{
number /= p10;
}
else
{
number *= p10;
}
}
n >>= 1;
p10 *= p10;
}
if (!is_real(number))
{
set_errno(ERANGE);
}
errout:
if (endptr)
{
*endptr = p;
}
return number;
}

980
libs/libc/stdlib/lib_strtold.c
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