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[CRT:MATH] Implement _finite, _finitef

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This commit is contained in:
Timo Kreuzer
2024-12-02 20:17:14 +02:00
parent 50028685dc
commit e01231bd49
5 changed files with 41 additions and 17 deletions
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2
dll/win32/ucrtbase/ucrtbase.spec
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@@ -371,7 +371,7 @@
@ cdecl _findnext64(long ptr)
@ cdecl _findnext64i32(long ptr)
@ cdecl _finite(double)
@ cdecl -stub -arch=!i386 _finitef(float)
@ cdecl -arch=!i386 _finitef(float)
@ cdecl _flushall()
@ cdecl _fpclass(double)
@ cdecl -stub -arch=!i386 _fpclassf(float)

16
sdk/lib/crt/float/isnan.c
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@@ -36,19 +36,3 @@ int CDECL _isnan(double __x)
x.__x = &__x;
return ( x.x->exponent == 0x7ff && ( x.x->mantissah != 0 || x.x->mantissal != 0 ));
}
/*
* @implemented
*/
int CDECL _finite(double __x)
{
union
{
double* __x;
double_s* x;
} x;
x.__x = &__x;
return ((x.x->exponent & 0x7ff) != 0x7ff);
}

19
sdk/lib/crt/math/_finite.c Normal file
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@@ -0,0 +1,19 @@
/*
* PROJECT: ReactOS CRT
* LICENSE: MIT (https://spdx.org/licenses/MIT)
* PURPOSE: Implementation of _finite.
* COPYRIGHT: Copyright 2025 Timo Kreuzer <timo.kreuzer@reactos.org>
*/
#include <float.h>
#include <stdint.h>
_Check_return_
int
__cdecl
_finite(_In_ double _X)
{
union { double f; uint64_t ui64; } u = { _X };
uint64_t exp = u.ui64 & 0x7FF0000000000000;
return (exp != 0x7FF0000000000000);
}

19
sdk/lib/crt/math/_finitef.c Normal file
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@@ -0,0 +1,19 @@
/*
* PROJECT: ReactOS CRT
* LICENSE: MIT (https://spdx.org/licenses/MIT)
* PURPOSE: Implementation of _finitef.
* COPYRIGHT: Copyright 2025 Timo Kreuzer <timo.kreuzer@reactos.org>
*/
#include <float.h>
#include <stdint.h>
_Check_return_
int
__cdecl
_finitef(_In_ float _X)
{
union { float f; uint32_t ui32; } u = { _X };
uint32_t exp = u.ui32 & 0x7F800000;
return (exp != 0x7F800000);
}

2
sdk/lib/crt/math/math.cmake
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@@ -5,6 +5,8 @@ list(APPEND LIBCNTPR_MATH_SOURCE
math/_chgsignf.c
math/_dsign.c
math/_fdsign.c
math/_finite.c
math/_finitef.c
math/_invoke_matherr.c
math/abs.c
math/div.c