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/* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
changed for long double by olaf flebbe
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. */
#include <ansidecl.h>
#include <errno.h>
#if defined(__i386__)
#include <fpu_control.h>
#include <signal.h>
#endif /* defined(__i386__) */
/* Deal with an infinite or NaN result.
If ERROR is ERANGE, result is +Inf;
if ERROR is - ERANGE, result is -Inf;
otherwise result is NaN.
This will set `errno' to either ERANGE or EDOM,
and may return an infinity or NaN, or may do something else. */
long double
DEFUN(__infnanl, (error), int error)
{
union {
unsigned int i[3];
long double d;
}u;
u.i[0] = 0;
u.i[1] = 0;
switch (error)
{
case ERANGE:
errno = ERANGE;
#if defined(__i386__)
if (!(__getfpucw() & _FPU_MASK_OM))
(void) raise(SIGFPE);
#endif /* defined(__i386__) */
u.i[2] = 0x7fff;
return (u.d);
case - ERANGE:
errno = ERANGE;
#if defined(__i386__)
if (!(__getfpucw() & _FPU_MASK_OM))
(void) raise(SIGFPE);
#endif /* defined(__i386__) */
u.i[2] = 0xffff;
return (u.d);
default:
errno = EDOM;
#if defined(__i386__)
if (!(__getfpucw() & _FPU_MASK_IM))
(void) raise(SIGFPE);
#endif /* defined(__i386__) */
u.i[2] = 0xffff;
u.i[1] = 0xC0000000;
return (u.d);
}
}
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