tango.stdc.fenv source code

1 /**
2  * D header file for C99.
3  *
4  * Copyright: Public Domain
5  * License:   Public Domain
6  * Authors:   Sean Kelly, Walter Bright
7  * Standards: ISO/IEC 9899:1999 (E)
8  */
9 module tango.stdc.fenv;
10 
11 extern (C):
12 
13 version( Win32 )
14 {
15     struct fenv_t
16     {
17         ushort    status;
18         ushort    control;
19         ushort    round;
20         ushort[2] reserved;
21     }
22 
23     alias int fexcept_t;
24 }
25 else version( linux )
26 {
27     struct fenv_t
28     {
29         ushort __control_word;
30         ushort __unused1;
31         ushort __status_word;
32         ushort __unused2;
33         ushort __tags;
34         ushort __unused3;
35         uint   __eip;
36         ushort __cs_selector;
37         ushort __opcode;
38         uint   __data_offset;
39         ushort __data_selector;
40         ushort __unused5;
41     }
42 
43     alias int fexcept_t;
44 }
45 else version(OSX)
46 {
47     version ( BigEndian )
48     {
49         alias uint fenv_t;
50         alias uint fexcept_t;
51     }
52     version ( LittleEndian )
53     {
54         struct fenv_t
55         {
56             ushort  __control;
57             ushort  __status;
58             uint    __mxcsr;
59             byte[8] __reserved;
60         }
61 
62         alias ushort fexcept_t;
63     }
64 }
65 else version (FreeBSD)
66 {
67     struct fenv_t
68     {
69         ushort __control;
70         ushort __mxcsr_hi;
71         ushort __status;
72         ushort __mxcsr_lo;
73         uint __tag;
74         byte[16] __other;
75     }
76 
77     alias ushort fexcept_t;
78 }
79 else version ( solaris )
80 {
81 	private import tango.stdc.config;
82 	
83 	struct __fex_handler_struct
84 	{
85 		int	__mode;
86 		void function() handler;
87 	}
88 	alias __fex_handler_struct[12] __fex_handler_t;
89 	
90 	struct fenv_t
91 	{
92 		__fex_handler_t	__handlers;
93 		c_ulong	__fsr;
94 	}
95 	
96 	alias int fexcept_t;
97 }
98 else
99 {
100     static assert( false );
101 }
102 
103 enum
104 {
105     FE_INVALID      = 1,
106     FE_DENORMAL     = 2, // non-standard
107     FE_DIVBYZERO    = 4,
108     FE_OVERFLOW     = 8,
109     FE_UNDERFLOW    = 0x10,
110     FE_INEXACT      = 0x20,
111     FE_ALL_EXCEPT   = 0x3F,
112     FE_TONEAREST    = 0,
113     FE_UPWARD       = 0x800,
114     FE_DOWNWARD     = 0x400,
115     FE_TOWARDZERO   = 0xC00,
116 }
117 
118 version( Win32 )
119 {
120     private extern const fenv_t _FE_DFL_ENV;
121     const fenv_t* FE_DFL_ENV = &_FE_DFL_ENV;
122 }
123 else version( linux )
124 {
125     fenv_t* FE_DFL_ENV = cast(fenv_t*)(-1);
126 }
127 else version(OSX)
128 {
129     private extern const fenv_t _FE_DFL_ENV;
130     const fenv_t* FE_DFL_ENV = &_FE_DFL_ENV;
131 }
132 else version( FreeBSD )
133 {
134     private extern const fenv_t __fe_dfl_env;
135     const fenv_t* FE_DFL_ENV = &__fe_dfl_env;
136 }
137 else version( solaris )
138 {
139     private extern const fenv_t __fenv_dfl_env;
140     const fenv_t* FE_DFL_ENV = &__fe_dfl_env;
141 }
142 else
143 {
144     static assert( false );
145 }
146 
147 void feraiseexcept(int excepts);
148 void feclearexcept(int excepts);
149 
150 int fetestexcept(int excepts);
151 int feholdexcept(fenv_t* envp);
152 
153 void fegetexceptflag(fexcept_t* flagp, int excepts);
154 void fesetexceptflag(in fexcept_t* flagp, int excepts);
155 
156 int fegetround();
157 int fesetround(int round);
158 
159 void fegetenv(fenv_t* envp);
160 void fesetenv(in fenv_t* envp);
161 void feupdateenv(in fenv_t* envp);