/* * @APPLE_LICENSE_HEADER_START@ * * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this * file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* File: HIDUsageListDifference.c Contains: xxx put contents here xxx Version: xxx put version here xxx Copyright: © 1999 by Apple Computer, Inc., all rights reserved. File Ownership: DRI: xxx put dri here xxx Other Contact: xxx put other contact here xxx Technology: xxx put technology here xxx Writers: (BWS) Brent Schorsch Change History (most recent first): <USB1> 3/5/99 BWS first checked in */ #include "HIDLib.h" /* *------------------------------------------------------------------------------ * * In - Is a usage in a UsageList? * * Input: * piUsageList - usage List * iUsageListLength - Max entries in usage Lists * usage - The usage * Output: * Returns: true or false * *------------------------------------------------------------------------------ */ static Boolean IsUsageInUsageList(HIDUsage *piUsageList, UInt32 iUsageListLength, HIDUsage usage) { unsigned int i; for (i = 0; i < iUsageListLength; i++) if (piUsageList[i] == usage) return true; return false; } /* *------------------------------------------------------------------------------ * * HIDUsageListDifference - Return adds and drops given present and past * * Input: * piPreviouUL - Previous usage List * piCurrentUL - Current usage List * piBreakUL - Break usage List * piMakeUL - Make usage List * iUsageListLength - Max entries in usage Lists * Output: * piBreakUL - Break usage List * piMakeUL - Make usage List * Returns: * *------------------------------------------------------------------------------ */ OSStatus HIDUsageListDifference(HIDUsage *piPreviousUL, HIDUsage *piCurrentUL, HIDUsage *piBreakUL, HIDUsage *piMakeUL, UInt32 iUsageListLength) { int i; HIDUsage usage; int iBreakLength=0; int iMakeLength=0; for (i = 0; i < iUsageListLength; i++) { /* * If in Current but not Previous then it's a Make */ usage = piCurrentUL[i]; if ((usage != 0) && (!IsUsageInUsageList(piPreviousUL,iUsageListLength,usage)) && (!IsUsageInUsageList(piMakeUL,iMakeLength,usage))) piMakeUL[iMakeLength++] = usage; /* * If in Previous but not Current then it's a Break */ usage = piPreviousUL[i]; if ((usage != 0) && (!IsUsageInUsageList(piCurrentUL,iUsageListLength,usage)) && (!IsUsageInUsageList(piBreakUL,iBreakLength,usage))) piBreakUL[iBreakLength++] = usage; } /* * Clear the rest of the usage Lists */ while (iMakeLength < iUsageListLength) piMakeUL[iMakeLength++] = 0; while (iBreakLength < iUsageListLength) piBreakUL[iBreakLength++] = 0; return kHIDSuccess; }