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Annotation of XNU/iokit/Families/IOHIDSystem/IOHIDDescriptorParser/HIDUsageInRange.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
                      3:  *
                      4:  * @APPLE_LICENSE_HEADER_START@
                      5:  * 
                      6:  * The contents of this file constitute Original Code as defined in and
                      7:  * are subject to the Apple Public Source License Version 1.1 (the
                      8:  * "License").  You may not use this file except in compliance with the
                      9:  * License.  Please obtain a copy of the License at
                     10:  * http://www.apple.com/publicsource and read it before using this file.
                     11:  * 
                     12:  * This Original Code and all software distributed under the License are
                     13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
                     14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
                     15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
                     16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
                     17:  * License for the specific language governing rights and limitations
                     18:  * under the License.
                     19:  * 
                     20:  * @APPLE_LICENSE_HEADER_END@
                     21:  */
                     22: /*
                     23:        File:           HIDUsageInRange.c
                     24: 
                     25:        Contains:       xxx put contents here xxx
                     26: 
                     27:        Version:        xxx put version here xxx
                     28: 
                     29:        Copyright:      � 1999 by Apple Computer, Inc., all rights reserved.
                     30: 
                     31:        File Ownership:
                     32: 
                     33:                DRI:                            xxx put dri here xxx
                     34: 
                     35:                Other Contact:          xxx put other contact here xxx
                     36: 
                     37:                Technology:                     xxx put technology here xxx
                     38: 
                     39:        Writers:
                     40: 
                     41:                (BWS)   Brent Schorsch
                     42: 
                     43:        Change History (most recent first):
                     44: 
                     45:          <USB1>          3/5/99        BWS             first checked in
                     46: */
                     47: 
                     48: #include "HIDLib.h"
                     49: 
                     50: /*
                     51:  *------------------------------------------------------------------------------
                     52:  *
                     53:  * HIDUsageInRange
                     54:  *
                     55:  *      Input:
                     56:  *                       ptUsage                               - The usage/UsageRange Item
                     57:  *                       usagePage                        - The usagePage of the Item - or zero
                     58:  *                       usage                            - The usage of the Item
                     59:  *      Output:
                     60:  *      Returns:
                     61:  *                       true                                  - usagePage/usage is in usage/UsageRange
                     62:  *                       false                                 - usagePage/usage is not in usage/UsageRange
                     63:  *
                     64:  *------------------------------------------------------------------------------
                     65: */
                     66: Boolean HIDUsageInRange (HIDP_UsageItem *ptUsage, HIDUsage usagePage, HIDUsage usage)
                     67: {
                     68: /*
                     69:  *     Disallow Null Pointers
                     70: */
                     71:        if (ptUsage == NULL)
                     72:                return false;
                     73: /*
                     74:  *     Check for the proper Page, 0 means don't care
                     75: */
                     76:        if ((usagePage != 0) && (ptUsage->usagePage != usagePage))
                     77:                return false;
                     78: /*
                     79:  *     usage = 0 means don't care
                     80: */
                     81:        if (usage == 0)
                     82:                return true;
                     83: /*
                     84:  *     The requested usage must match or be in the range
                     85: */
                     86:        if (ptUsage->isRange)
                     87:        {
                     88:                if ((ptUsage->usageMinimum > usage) || (ptUsage->usageMaximum < usage))
                     89:                        return false;
                     90:        }
                     91:        else
                     92:        {
                     93:                if (ptUsage->usage != usage)
                     94:                        return false;
                     95:        }
                     96:        return true;
                     97: }

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