mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-11 15:50:06 +00:00
88 lines
2.7 KiB
C
88 lines
2.7 KiB
C
/* `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 */
|