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1//
2// matherr.cpp
3//
4// Copyright (c) 2024 Timo Kreuzer
5//
6// User math error support.
7//
8// SPDX-License-Identifier: MIT
9//
10
11#include <math.h>
12#include <corecrt_startup.h>
13#include <corecrt_internal.h>
14
15static __crt_state_management::dual_state_global<_UserMathErrorFunctionPointer> __acrt_global_user_matherr;
16
17//
18// Declared in corecrt_internal.h
19// Called from initialize_pointers()
20//
21extern "C"
22void __cdecl __acrt_initialize_user_matherr(void* encoded_null)
23{
24 __acrt_global_user_matherr.initialize(
25 reinterpret_cast<_UserMathErrorFunctionPointer>(encoded_null));
26}
27
28//
29// Declared in corecrt_internal.h
30//
31extern "C"
32bool __cdecl __acrt_has_user_matherr(void)
33{
34 _UserMathErrorFunctionPointer user_matherr =
35 __crt_fast_decode_pointer(__acrt_global_user_matherr.value());
36 return user_matherr != nullptr;
37}
38
39//
40// Declared in corecrt_internal.h
41//
42extern "C"
43int __cdecl __acrt_invoke_user_matherr(struct _exception* _Exp)
44{
45 _UserMathErrorFunctionPointer user_matherr =
46 __crt_fast_decode_pointer(__acrt_global_user_matherr.value());
47 if (user_matherr != nullptr)
48 {
49 return user_matherr(_Exp);
50 }
51
52 return 0;
53}
54
55//
56// Declared in corecrt_startup.h
57//
58extern "C"
59void
60__cdecl
61__setusermatherr(
62 _UserMathErrorFunctionPointer _UserMathErrorFunction)
63{
64 _UserMathErrorFunctionPointer encodedPtr =
65 __crt_fast_encode_pointer(_UserMathErrorFunction);
66
67 __acrt_global_user_matherr.value() = encodedPtr;
68}
69
70//
71// Used by libm
72//
73extern "C"
74int
75__cdecl
76_invoke_matherr(
77 int type,
78 char* name,
79 double arg1,
80 double arg2,
81 double retval)
82{
83 struct _exception excpt;
84 excpt.type = type;
85 excpt.name = name;
86 excpt.arg1 = arg1;
87 excpt.arg2 = arg2;
88 excpt.retval = retval;
89 return __acrt_invoke_user_matherr(&excpt);
90}