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/* $OpenBSD: frexp.c,v 1.4 1997/07/23 20:55:17 kstailey Exp $ */
/* $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.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char *rcsid = "$OpenBSD: frexp.c,v 1.4 1997/07/23 20:55:17 kstailey Exp $";
#endif /* LIBC_SCCS and not lint */
#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);
}
}
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