mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-19 10:53:58 +00:00
57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
/* $NetBSD: frexp.c,v 1.1 1995/02/10 17:50:22 cgd Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1994, 1995 Carnegie-Mellon University.
|
|
* All rights reserved.
|
|
*
|
|
* Author: Chris G. Demetriou
|
|
*
|
|
* Permission to use, copy, modify and distribute this software and
|
|
* its documentation is hereby granted, provided that both the copyright
|
|
* notice and this permission notice appear in all copies of the
|
|
* software, derivative works or modified versions, and any portions
|
|
* thereof, and that both notices appear in supporting documentation.
|
|
*
|
|
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
|
|
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
|
|
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
|
|
*
|
|
* Carnegie Mellon requests users of this software to return to
|
|
*
|
|
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
|
|
* School of Computer Science
|
|
* Carnegie Mellon University
|
|
* Pittsburgh PA 15213-3890
|
|
*
|
|
* any improvements or extensions that they make and grant Carnegie the
|
|
* rights to redistribute these changes.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/types.h>
|
|
#include <machine/ieee.h>
|
|
#include <math.h>
|
|
|
|
double
|
|
frexp(value, eptr)
|
|
double value;
|
|
int *eptr;
|
|
{
|
|
union doub {
|
|
double v;
|
|
struct ieee_double s;
|
|
} u;
|
|
|
|
if (value) {
|
|
u.v = value;
|
|
*eptr = u.s.dbl_exp - (DBL_EXP_BIAS - 1);
|
|
u.s.dbl_exp = DBL_EXP_BIAS - 1;
|
|
return(u.v);
|
|
} else {
|
|
*eptr = 0;
|
|
return((double)0);
|
|
}
|
|
}
|