]>
Commit | Line | Data |
---|---|---|
63551311 UD |
1 | /* Copyright (C) 1997 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. | |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Library General Public License as | |
6 | published by the Free Software Foundation; either version 2 of the | |
7 | License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Library General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Library General Public | |
15 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
16 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
17 | Boston, MA 02111-1307, USA. */ | |
18 | ||
19 | /* | |
20 | * ISO C 9X 7.6: Floating-point environment <fenv.h> | |
21 | */ | |
22 | ||
23 | #ifndef _FENV_H | |
24 | ||
779ae82e | 25 | #define _FENV_H 1 |
63551311 UD |
26 | #include <features.h> |
27 | ||
28 | /* Get the architecture dependend definitions. The following definitions | |
29 | are expected to be done: | |
30 | ||
31 | fenv_t type for object representing an entire floating-point | |
32 | environment | |
33 | ||
34 | FE_DFL_ENV macro of type pointer to fenv_t to be used as the argument | |
35 | to functions taking an argument of type fenv_t; in this | |
36 | case the default environment will be used | |
37 | ||
38 | fexcept_t type for object representing the floating-point exception | |
39 | flags including status associated with the flags | |
40 | ||
41 | The following macros are defined iff the implementation supports this | |
42 | kind of exception. | |
779ae82e | 43 | FE_INEXACT inexact result |
63551311 UD |
44 | FE_DIVBYZERO devision by zero |
45 | FE_UNDERFLOW result not representable due to underflow | |
46 | FE_OVERFLOW result not representable due to overflow | |
47 | FE_INVALID invalid operation | |
48 | ||
49 | FE_ALL_EXCEPT bitwise OR of all supported exceptions | |
50 | ||
51 | The next macros are defined iff the appropriate rounding mode is | |
52 | supported by the implementation. | |
53 | FE_TONEAREST round to nearest | |
54 | FE_UPWARD round toward +Inf | |
55 | FE_DOWNWARD round toward -Inf | |
56 | FE_TOWARDZERO round toward 0 | |
57 | */ | |
58 | #include <fenvbits.h> | |
59 | ||
60 | __BEGIN_DECLS | |
61 | ||
62 | /* Floating-point exception handling. */ | |
63 | ||
64 | /* Clear the supported exceptions represented by EXCEPTS. */ | |
65 | extern void feclearexcept __P ((int __excepts)); | |
66 | ||
67 | /* Store implementation-defined representation of the exception flags | |
68 | indicated by EXCEPTS in the object pointed to by FLAGP. */ | |
69 | extern void fegetexceptflag __P ((fexcept_t *__flagp, int __excepts)); | |
70 | ||
71 | /* Raise the supported exceptions represented by EXCEPTS. */ | |
72 | extern void feraiseexcept __P ((int __excepts)); | |
73 | ||
74 | /* Set complete status for exceptions inidicated by EXCEPTS according to | |
75 | the representation in the object pointed to by FLAGP. */ | |
76 | extern void fesetexceptflag __P ((__const fexcept_t *__flagp, int __excepts)); | |
77 | ||
78 | /* Determine which of subset of the exceptions specified by EXCEPTS are | |
79 | currently set. */ | |
80 | extern int fetestexcept __P ((int __excepts)); | |
81 | ||
82 | ||
83 | /* Rounding control. */ | |
84 | ||
85 | /* Get current rounding direction. */ | |
86 | extern int fegetround __P ((void)); | |
87 | ||
88 | /* Establish the rounding direction represented by ROUND. */ | |
779ae82e | 89 | extern int fesetround __P ((int __rounding_direction)); |
63551311 UD |
90 | |
91 | ||
92 | /* Floating-point environment. */ | |
93 | ||
94 | /* Store the current floating-point environment in the object pointed | |
95 | to by ENVP. */ | |
96 | extern void fegetenv __P ((fenv_t *__envp)); | |
97 | ||
98 | /* Save the current environment in the object pointed to by ENVP, clear | |
99 | exception flags and install a non-stop mode (if available) for all | |
100 | exceptions. */ | |
101 | extern int feholdexcept __P ((fenv_t *__envp)); | |
102 | ||
103 | /* Establish the floating-point environment represented by the object | |
104 | pointed to by ENVP. */ | |
105 | extern void fesetenv __P ((__const fenv_t *__envp)); | |
106 | ||
107 | /* Save current exceptions in temporary storage, install environment | |
108 | represented by object pointed to by ENVP and raise exceptions | |
109 | according to saved exceptions. */ | |
110 | extern void feupdateenv __P ((__const fenv_t *__envp)); | |
111 | ||
112 | __END_DECLS | |
113 | ||
114 | #endif /* fenv.h */ |