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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License, Version 1.0 only
      6  * (the "License").  You may not use this file except in compliance
      7  * with the License.
      8  *
      9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
     10  * or http://www.opensolaris.org/os/licensing.
     11  * See the License for the specific language governing permissions
     12  * and limitations under the License.
     13  *
     14  * When distributing Covered Code, include this CDDL HEADER in each
     15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     16  * If applicable, add the following below this CDDL HEADER, with the
     17  * fields enclosed by brackets "[]" replaced with your own identifying
     18  * information: Portions Copyright [yyyy] [name of copyright owner]
     19  *
     20  * CDDL HEADER END
     21  */
     22 /*
     23  * Copyright (c) 2001 by Sun Microsystems, Inc.
     24  * All rights reserved.
     25  */
     26 
     27 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     28 
     29 #include <string.h>
     30 
     31 #include "options.h"
     32 
     33 static uchar_t bitlocation[8] = {1, 2, 4, 8, 0x10, 0x20, 0x40, 0x80};
     34 
     35 /*
     36  * Create a bytemask to store the command line options.
     37  */
     38 void
     39 set_options_mask(options *msk, char *str)
     40 {
     41 	int i;
     42 	(void) memset(msk, 0, sizeof (*msk));
     43 	for (i = 0; str[i] != 0; i++) {
     44 		add_option(msk, str[i]);
     45 	}
     46 }
     47 
     48 void
     49 add_option(options *msk, char option)
     50 {
     51 	uint_t loc;
     52 	loc = (uint_t)option;
     53 	loc &= 0x7f;
     54 	/* put option into the correct bucket */
     55 	msk->bitmap[loc >> 3] |= bitlocation[loc & 7];
     56 }
     57 
     58 /*
     59  * Compare the bytemask of the command line options used with
     60  * acceptable options. If an invalid option is found use it as
     61  * the return value.
     62  */
     63 int
     64 compare_options_mask(options *msk, options *specified)
     65 {
     66 	int i, j;
     67 	uchar_t bmap = 0;
     68 
     69 	for (i = 0; i < 16; i++) {
     70 		if (msk->bitmap[i] == specified->bitmap[i])
     71 			continue;
     72 		bmap = msk->bitmap[i] | specified->bitmap[i];
     73 		bmap ^= msk->bitmap[i];
     74 		if (bmap)
     75 			break;
     76 	}
     77 	if (i == 16) {
     78 		/* no invalid options found */
     79 		return (0);
     80 	}
     81 
     82 	for (j = 0; j < 8; j++) {
     83 		if (bmap & bitlocation[j])
     84 			break;
     85 	}
     86 	return ((i*8) + j);
     87 }
     88