usr/src/cmd/cdrw/options.c

   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 }