xref: /onnv-gate/usr/src/cmd/acct/lib/expand.c (revision 428:a261479c3dbd)
10Sstevel@tonic-gate /*
20Sstevel@tonic-gate  * CDDL HEADER START
30Sstevel@tonic-gate  *
40Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
50Sstevel@tonic-gate  * Common Development and Distribution License, Version 1.0 only
60Sstevel@tonic-gate  * (the "License").  You may not use this file except in compliance
70Sstevel@tonic-gate  * with the License.
80Sstevel@tonic-gate  *
90Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
100Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
110Sstevel@tonic-gate  * See the License for the specific language governing permissions
120Sstevel@tonic-gate  * and limitations under the License.
130Sstevel@tonic-gate  *
140Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
150Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
160Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
170Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
180Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
190Sstevel@tonic-gate  *
200Sstevel@tonic-gate  * CDDL HEADER END
210Sstevel@tonic-gate  */
220Sstevel@tonic-gate /*
23*428Ssl108498  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
240Sstevel@tonic-gate  * Use is subject to license terms.
250Sstevel@tonic-gate  */
260Sstevel@tonic-gate 
270Sstevel@tonic-gate /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
280Sstevel@tonic-gate /*	  All Rights Reserved  	*/
290Sstevel@tonic-gate 
300Sstevel@tonic-gate 
310Sstevel@tonic-gate #pragma ident	"%Z%%M%	%I%	%E% SMI"	/* SVr4.0 1.7	*/
320Sstevel@tonic-gate 
330Sstevel@tonic-gate #include <sys/types.h>
340Sstevel@tonic-gate #include <sys/param.h>
350Sstevel@tonic-gate #include <sys/acct.h>
360Sstevel@tonic-gate 
370Sstevel@tonic-gate #ifdef uts
380Sstevel@tonic-gate float
390Sstevel@tonic-gate #else
400Sstevel@tonic-gate /*
410Sstevel@tonic-gate  * For as long as ct is of type comp_t, and comp_t is defined to be of type
420Sstevel@tonic-gate  * unsigned short, the maximum value of ct will be 2^16-1 ie 65535. Based on
430Sstevel@tonic-gate  * this input value, the maximum value that expand() can return will therefore
440Sstevel@tonic-gate  * be 4292870144. A return type of ulong_t ensures we don't overflow.
450Sstevel@tonic-gate  */
460Sstevel@tonic-gate ulong_t
470Sstevel@tonic-gate #endif
expand(comp_t ct)480Sstevel@tonic-gate expand(comp_t ct)
490Sstevel@tonic-gate {
50*428Ssl108498 	int e;
510Sstevel@tonic-gate #ifdef uts
520Sstevel@tonic-gate 	float f;
530Sstevel@tonic-gate #else
540Sstevel@tonic-gate 	ulong_t f;
550Sstevel@tonic-gate #endif
560Sstevel@tonic-gate 	e = (ct >> 13) & 07;
570Sstevel@tonic-gate 	f = ct & 017777;
580Sstevel@tonic-gate 
590Sstevel@tonic-gate 	while (e-- > 0)
600Sstevel@tonic-gate #ifdef uts
610Sstevel@tonic-gate 		f *= 8.0;		/* can't shift a float */
620Sstevel@tonic-gate #else
630Sstevel@tonic-gate 		f <<=3;
640Sstevel@tonic-gate #endif
650Sstevel@tonic-gate 
660Sstevel@tonic-gate 	return f;
670Sstevel@tonic-gate }
68