fcvt.cpp File Reference

#include <corecrt_internal.h>
#include <corecrt_internal_fltintrn.h>
#include <corecrt_internal_ptd_propagation.h>
#include <corecrt_internal_securecrt.h>
#include <minmax.h>
#include <stdlib.h>

Include dependency graph for fcvt.cpp:

Go to the source code of this file.

Functions
static char *__cdecl	try_get_ptd_buffer (__crt_cached_ptd_host &ptd)
static errno_t __cdecl	internal_to_string (_Out_writes_z_(buffer_count) char *const buffer, size_t const buffer_count, STRFLT const strflt, int const requested_digits, int *const decimal_point, int *const sign, __crt_cached_ptd_host &ptd) throw ()
static errno_t __cdecl	_fcvt_s_internal (char *const buffer, size_t const buffer_count, double const value, int const requested_digits, int *const decimal_point, int *const sign, __crt_cached_ptd_host &ptd)
errno_t __cdecl	_fcvt_s (char *const buffer, size_t const buffer_count, double const value, int const requested_digits, int *const decimal_point, int *const sign)
static char *__cdecl	_fcvt_internal (double const value, int const requested_digits, int *const decimal_point, int *const sign, __crt_cached_ptd_host &ptd)
char *__cdecl	_fcvt (double const value, int const requested_digits, int *const decimal_point, int *const sign)
static errno_t __cdecl	_ecvt_s_internal (char *const buffer, size_t const buffer_count, double const value, int const requested_digits, int *const decimal_point, int *const sign, __crt_cached_ptd_host &ptd)
errno_t __cdecl	_ecvt_s (char *const buffer, size_t const buffer_count, double const value, int const requested_digits, int *const decimal_point, int *const sign)
static char *__cdecl	_ecvt_internal (double const value, int const requested_digits, int *const decimal_point, int *const sign, __crt_cached_ptd_host &ptd)
char *__cdecl	_ecvt (double const value, int const requested_digits, int *const decimal_point, int *const sign)

Function Documentation

_ecvt()

char *__cdecl _ecvt	(	double const	value,
		int const	requested_digits,
		int *const	decimal_point,
		int *const	sign
	)

Definition at line 287 of file fcvt.cpp.

{
    __crt_cached_ptd_host ptd;
    return _ecvt_internal(value, requested_digits, decimal_point, sign, ptd);
}

_ecvt_internal()

static char *__cdecl _ecvt_internal ( double const  value, int const  requested_digits, int *const  decimal_point, int *const  sign, __crt_cached_ptd_host &  ptd  )

static

Definition at line 258 of file fcvt.cpp.

{
    char* const buffer = try_get_ptd_buffer(ptd);
    if (!buffer)
    {
        return nullptr;
    }
 
    // Make sure we don't overflow the buffer.  If the user asks for more digits
    // than the buffer can handle, truncate it to the maximum size allowed in
    // the buffer.  The maximum size is two less than the buffer size because we
    // use one character for overflow and one for the null terminator.
    int const capped_digits = min(requested_digits, _CVTBUFSIZE - 2);
 
    errno_t const e = _ecvt_s_internal(buffer, _CVTBUFSIZE, value, capped_digits, decimal_point, sign, ptd);
    if (e != 0)
    {
        return nullptr;
    }
 
    return buffer;
}

Referenced by _ecvt().

_ecvt_s()

errno_t __cdecl _ecvt_s	(	char *const	buffer,
		size_t const	buffer_count,
		double const	value,
		int const	requested_digits,
		int *const	decimal_point,
		int *const	sign
	)

Definition at line 245 of file fcvt.cpp.

{
    __crt_cached_ptd_host ptd;
    return _ecvt_s_internal(buffer, buffer_count, value, requested_digits, decimal_point, sign, ptd);
}

_ecvt_s_internal()

static errno_t __cdecl _ecvt_s_internal ( char *const  buffer, size_t const  buffer_count, double const  value, int const  requested_digits, int *const  decimal_point, int *const  sign, __crt_cached_ptd_host &  ptd  )

static

Definition at line 201 of file fcvt.cpp.

{
    _UCRT_VALIDATE_RETURN_ERRCODE(ptd, buffer != nullptr, EINVAL);
    _UCRT_VALIDATE_RETURN_ERRCODE(ptd, buffer_count > 0,  EINVAL);
    _RESET_STRING(buffer, buffer_count);
    _UCRT_VALIDATE_RETURN_ERRCODE(ptd, decimal_point != nullptr, EINVAL);
    _UCRT_VALIDATE_RETURN_ERRCODE(ptd, sign != nullptr,          EINVAL);
 
    char result_string[_CVTBUFSIZE + 1];
 
    _strflt strflt{};
    __acrt_fltout(
        reinterpret_cast<_CRT_DOUBLE const&>(value),
        _countof(result_string),
        __acrt_precision_style::fixed,
        &strflt,
        result_string,
        _countof(result_string));
 
    errno_t const e = internal_to_string(buffer, buffer_count, &strflt, requested_digits, decimal_point, sign, ptd);
 
    // Make sure we don't overflow the buffer.  If the user asks for more digits
    // than the buffer can handle, truncate it to the maximum size allowed in
    // the buffer.  The maximum size is two less than the buffer size because we
    // use one character for overflow and one for the null terminator.
    int const capped_digits = min(requested_digits, static_cast<int>(buffer_count - 2));
 
    // The conversion function occasionally returns an extra char in the buffer:
    if (capped_digits >= 0 && buffer[capped_digits])
    {
        buffer[capped_digits] = '\0';
    }
 
    return e;
}

Referenced by _ecvt_internal(), and _ecvt_s().

_fcvt()

char *__cdecl _fcvt	(	double const	value,
		int const	requested_digits,
		int *const	decimal_point,
		int *const	sign
	)

Definition at line 177 of file fcvt.cpp.

{
    __crt_cached_ptd_host ptd;
    return _fcvt_internal(value, requested_digits, decimal_point, sign, ptd);
}

_fcvt_internal()

static char *__cdecl _fcvt_internal ( double const  value, int const  requested_digits, int *const  decimal_point, int *const  sign, __crt_cached_ptd_host &  ptd  )

static

Definition at line 137 of file fcvt.cpp.

{
    char* const buffer = try_get_ptd_buffer(ptd);
    if (!buffer)
    {
        return nullptr;
    }
 
    char result_string[_CVTBUFSIZE + 1];
 
    _strflt strflt{};
    __acrt_fltout(
        reinterpret_cast<_CRT_DOUBLE const&>(value),
        _countof(result_string),
        __acrt_precision_style::fixed,
        &strflt,
        result_string,
        _countof(result_string));
 
    // Make sure we don't overflow the buffer.  If the user asks for more digits
    // than the buffer can handle, truncate it to the maximum size allowed in
    // the buffer.  The maximum size is two less than the buffer size because we
    // use one character for overflow and one for the null terminator.
    int const capped_digits = min(requested_digits, _CVTBUFSIZE - 2 - strflt.decpt);
 
    errno_t const status = _fcvt_s_internal(buffer, _CVTBUFSIZE, value, capped_digits, decimal_point, sign, ptd);
    if (status != 0)
    {
        return nullptr;
    }
 
    return buffer;
}

Referenced by _fcvt().

_fcvt_s()

errno_t __cdecl _fcvt_s	(	char *const	buffer,
		size_t const	buffer_count,
		double const	value,
		int const	requested_digits,
		int *const	decimal_point,
		int *const	sign
	)

Definition at line 124 of file fcvt.cpp.

{
    __crt_cached_ptd_host ptd;
    return _fcvt_s_internal(buffer, buffer_count, value, requested_digits, decimal_point, sign, ptd);
}

_fcvt_s_internal()

static errno_t __cdecl _fcvt_s_internal ( char *const  buffer, size_t const  buffer_count, double const  value, int const  requested_digits, int *const  decimal_point, int *const  sign, __crt_cached_ptd_host &  ptd  )

static

Definition at line 86 of file fcvt.cpp.

{
    _UCRT_VALIDATE_RETURN_ERRCODE(ptd, buffer != nullptr, EINVAL);
    _UCRT_VALIDATE_RETURN_ERRCODE(ptd, buffer_count > 0,  EINVAL);
    _RESET_STRING(buffer, buffer_count);
    _UCRT_VALIDATE_RETURN_ERRCODE(ptd, decimal_point != nullptr, EINVAL);
    _UCRT_VALIDATE_RETURN_ERRCODE(ptd, sign != nullptr,          EINVAL);
 
    char result_string[_CVTBUFSIZE + 1];
 
    _strflt strflt{};
    __acrt_fltout(
        reinterpret_cast<_CRT_DOUBLE const&>(value),
        _countof(result_string),
        __acrt_precision_style::fixed,
        &strflt,
        result_string,
        _countof(result_string));
 
    int const actual_digits = strflt.decpt + requested_digits;
 
    bool const buffer_insufficiently_large =
        requested_digits > 0 && strflt.decpt > 0 &&
        actual_digits < requested_digits;
 
    int const capped_digits = buffer_insufficiently_large ? INT_MAX : actual_digits;
 
    return internal_to_string(buffer, buffer_count, &strflt, capped_digits, decimal_point, sign, ptd);
}

Referenced by _fcvt_internal(), and _fcvt_s().

internal_to_string()

static errno_t __cdecl internal_to_string ( _Out_writes_z_(buffer_count) char *const  buffer, size_t const  buffer_count, STRFLT const  strflt, int const  requested_digits, int *const  decimal_point, int *const  sign, __crt_cached_ptd_host &  ptd  ) throw ( )

static

Definition at line 40 of file fcvt.cpp.

{
    // Make sure we don't overflow the buffer.  If the user asks for more digits
    // than the buffer can handle, truncate it to the maximum size allowed in
    // the buffer.  The maximum size is two less than the buffer size because we
    // use one character for overflow and one for the null terminator.
    size_t const minimum_buffer_count = static_cast<size_t>((requested_digits > 0 ? requested_digits : 0) + 2);
 
    _UCRT_VALIDATE_RETURN_ERRCODE(ptd, buffer_count >= minimum_buffer_count, ERANGE);
 
    int const capped_digits = min(requested_digits, static_cast<int>(buffer_count - 2));
 
    errno_t const e = __acrt_fp_strflt_to_string(buffer, buffer_count, capped_digits, strflt, __acrt_has_trailing_digits::trailing, __acrt_rounding_mode::legacy, ptd);
 
    if (e != 0)
    {
        return ptd.get_errno().set(e);
    }
 
    *sign          = strflt->sign == '-' ? 1 : 0;
    *decimal_point = strflt->decpt;
 
    return 0;
}

Referenced by _ecvt_s_internal(), and _fcvt_s_internal().

try_get_ptd_buffer()

static char *__cdecl try_get_ptd_buffer ( __crt_cached_ptd_host &  ptd )

static

Definition at line 18 of file fcvt.cpp.

{
    __acrt_ptd* const raw_ptd = ptd.get_raw_ptd_noexit();
    if (!raw_ptd)
    {
        return nullptr;
    }
 
    if (raw_ptd->_cvtbuf)
    {
        return raw_ptd->_cvtbuf;
    }
 
    raw_ptd->_cvtbuf = _malloc_crt_t(char, _CVTBUFSIZE).detach();
 
    return raw_ptd->_cvtbuf;
}

Referenced by _ecvt_internal(), and _fcvt_internal().