iokit/Kernel/IOPMPowerSourceList.cpp

   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 #include <IOKit/pwr_mgt/IOPM.h>
  23 #include <IOKit/pwr_mgt/IOPMPowerSourceList.h>
  24 #include <IOKit/pwr_mgt/IOPMPowerSource.h>
  25
  26 #define super OSObject
  27 OSDefineMetaClassAndStructors(IOPMPowerSourceList,OSObject)
  28
  29 //*********************************************************************************
  30 // init
  31 //
  32 //*********************************************************************************
  33 void IOPMPowerSourceList::initialize ( void )
  34 {
  35     firstItem = NULL;
  36     length = 0;
  37 }
  38
  39 //*********************************************************************************
  40 // addToList
  41 //
  42 //*********************************************************************************
  43
  44 IOReturn IOPMPowerSourceList::addToList ( IOPMPowerSource * newPowerSource )
  45 {
  46     IOPMPowerSource * nextPowerSource;
  47     nextPowerSource = firstItem;                                // Is new object already in the list?
  48     while (  nextPowerSource != NULL ) {
  49         if ( nextPowerSource == newPowerSource ) {
  50             return IOPMNoErr;                           // yes, just return
  51         }
  52         nextPowerSource = nextInList(nextPowerSource);
  53     }
  54     newPowerSource->nextInList = firstItem;             // add it to list
  55     firstItem = newPowerSource;
  56     length += 1;
  57     return IOPMNoErr;
  58 }
  59
  60
  61 //*********************************************************************************
  62 // firstInList
  63 //
  64 //*********************************************************************************
  65
  66 IOPMPowerSource * IOPMPowerSourceList::firstInList ( void )
  67 {
  68     return firstItem;
  69 }
  70
  71 //*********************************************************************************
  72 // nextInList
  73 //
  74 //*********************************************************************************
  75
  76 IOPMPowerSource * IOPMPowerSourceList::nextInList ( IOPMPowerSource * currentItem )
  77 {
  78     if ( currentItem != NULL ) {
  79        return (currentItem->nextInList);
  80     }
  81     return NULL;
  82 }
  83
  84 //*********************************************************************************
  85 // numberOfItems
  86 //
  87 //*********************************************************************************
  88
  89 unsigned long IOPMPowerSourceList::numberOfItems ( void )
  90 {
  91     return length;
  92 }
  93
  94 //*********************************************************************************
  95 // removeFromList
  96 //
  97 // Find the item in the list, unlink it, and free it.
  98 //*********************************************************************************
  99
 100 IOReturn IOPMPowerSourceList::removeFromList ( IOPMPowerSource * theItem )
 101 {
 102     IOPMPowerSource * item = firstItem;
 103     IOPMPowerSource * temp;
 104
 105     if ( item != NULL ) {
 106         if ( item  == theItem ) {
 107             firstItem = item->nextInList;
 108             length--;
 109             item->release();
 110             return IOPMNoErr;
 111         }
 112         while ( item->nextInList != NULL ) {
 113             if ( item->nextInList == theItem ) {
 114                 temp = item->nextInList;
 115                 item->nextInList = temp->nextInList;
 116                 length--;
 117                 temp->release();
 118                 return IOPMNoErr;
 119             }
 120             item = item->nextInList;
 121         }
 122     }
 123     return IOPMNoErr;
 124 }
 125
 126
 127 //*********************************************************************************
 128 // free
 129 //
 130 // Free all items in the list, and then free the list itself
 131 //*********************************************************************************
 132
 133 void IOPMPowerSourceList::free (void )
 134 {
 135     IOPMPowerSource * next = firstItem;
 136
 137     while ( next != NULL ) {
 138         firstItem = next->nextInList;
 139         length--;
 140         next->release();
 141         next = firstItem;
 142     }
 143 super::free();
 144 }
 145
 146
 147
 148
 149
 150
 151