mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-24 11:29:10 +00:00
68 lines
2.4 KiB
C
68 lines
2.4 KiB
C
/*-
|
|
* Copyright (c) 1991, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#if defined(LIBC_RCS) && !defined(lint)
|
|
static const char rcsid[] = "$FreeBSD$";
|
|
#endif /* LIBC_RCS and not lint */
|
|
|
|
#include <sys/types.h>
|
|
#include <math.h>
|
|
|
|
double
|
|
frexp(value, eptr)
|
|
double value;
|
|
int *eptr;
|
|
{
|
|
union {
|
|
double v;
|
|
struct {
|
|
u_int u_mant2 : 32;
|
|
u_int u_mant1 : 20;
|
|
u_int u_exp : 11;
|
|
u_int u_sign : 1;
|
|
} s;
|
|
} u;
|
|
|
|
if (value) {
|
|
u.v = value;
|
|
*eptr = u.s.u_exp - 1022;
|
|
u.s.u_exp = 1022;
|
|
return(u.v);
|
|
} else {
|
|
*eptr = 0;
|
|
return((double)0);
|
|
}
|
|
}
|