1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
|
/* `HUGE_VAL' constant for IEEE 754 machines (where it is infinity).
Used by <stdlib.h> and <math.h> functions for overflow.
Copyright (C) 1992, 1995 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#ifndef _HUGE_VAL_H
#define _HUGE_VAL_H 1
#include <features.h>
#include <sys/cdefs.h>
#include <endian.h>
/* IEEE positive infinity (-HUGE_VAL is negative infinity). */
#if __BYTE_ORDER == __BIG_ENDIAN
#define __HUGE_VAL_bytes { 0x7f, 0xf0, 0, 0, 0, 0, 0, 0 }
#endif
#if __BYTE_ORDER == __LITTLE_ENDIAN
#define __HUGE_VAL_bytes { 0, 0, 0, 0, 0, 0, 0xf0, 0x7f }
#endif
#define __huge_val_t union { unsigned char __c[8]; double __d; }
#ifdef __GNUC__
#define HUGE_VAL (__extension__ \
((__huge_val_t) { __c: __HUGE_VAL_bytes }).__d)
#else /* Not GCC. */
static __huge_val_t __huge_val = { __HUGE_VAL_bytes };
#define HUGE_VAL (__huge_val.__d)
#endif /* GCC. */
/* GNU extensions: (float) HUGE_VALf and (long double) HUGE_VALl. */
#ifdef __USE_GNU
#if __BYTE_ORDER == __BIG_ENDIAN
#define __HUGE_VALf_bytes { 0x7f, 0x80, 0, 0 }
#endif
#if __BYTE_ORDER == __LITTLE_ENDIAN
#define __HUGE_VALf_bytes { 0, 0, 0x80, 0x7f }
#endif
#define __huge_valf_t union { unsigned char __c[4]; float __f; }
#ifdef __GNUC__
#define HUGE_VALf (__extension__ \
((__huge_valf_t) { __c: __HUGE_VALf_bytes }).__f)
#else /* Not GCC. */
static __huge_valf_t __huge_valf = { __HUGE_VALf_bytes };
#define HUGE_VALf (__huge_valf.__f)
#endif /* GCC. */
#if __BYTE_ORDER == __BIG_ENDIAN
#define __HUGE_VALl_bytes { 0x7f, 0xff, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
#endif
#if __BYTE_ORDER == __LITTLE_ENDIAN
#define __HUGE_VALl_bytes { 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0x7f, 0, 0 }
#endif
#define __huge_vall_t union { unsigned char __c[12]; long double __ld; }
#ifdef __GNUC__
#define HUGE_VALl (__extension__ \
((__huge_vall_t) { __c: __HUGE_VALl_bytes }).__ld)
#else /* Not GCC. */
static __huge_vall_t __huge_vall = { __HUGE_VALl_bytes };
#define HUGE_VALl (__huge_vall.__ld)
#endif /* GCC. */
#endif /* __USE_GNU. */
#endif /* huge_val.h */
|
