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 <stddef.h>
23 #include <IOKit/pwr_mgt/IOPM.h>
24 #include <IOKit/pwr_mgt/IOPMPowerSourceList.h>
25 #include <IOKit/pwr_mgt/IOPMPowerSource.h>
26 
27 #define super OSObject
28 OSDefineMetaClassAndStructors(IOPMPowerSourceList,OSObject)
29 
30 //*********************************************************************************
31 // init
32 //
33 //*********************************************************************************
34 void IOPMPowerSourceList::initialize ( void )
35 {
36     firstItem = NULL;
37     length = 0;
38 }
39 
40 //*********************************************************************************
41 // addToList
42 //
43 //*********************************************************************************
44 
45 IOReturn IOPMPowerSourceList::addToList ( IOPMPowerSource * newPowerSource )
46 {
47     IOPMPowerSource * nextPowerSource;
48     nextPowerSource = firstItem;				// Is new object already in the list?
49     while (  nextPowerSource != NULL ) {
50         if ( nextPowerSource == newPowerSource ) {
51             return IOPMNoErr;				// yes, just return
52         }
53         nextPowerSource = nextInList(nextPowerSource);
54     }
55     newPowerSource->nextInList = firstItem;		// add it to list
56     firstItem = newPowerSource;
57     length += 1;
58     return IOPMNoErr;
59 }
60 
61 
62 //*********************************************************************************
63 // firstInList
64 //
65 //*********************************************************************************
66 
67 IOPMPowerSource * IOPMPowerSourceList::firstInList ( void )
68 {
69     return firstItem;
70 }
71 
72 //*********************************************************************************
73 // nextInList
74 //
75 //*********************************************************************************
76 
77 IOPMPowerSource * IOPMPowerSourceList::nextInList ( IOPMPowerSource * currentItem )
78 {
79     if ( currentItem != NULL ) {
80        return (currentItem->nextInList);
81     }
82     return NULL;
83 }
84 
85 //*********************************************************************************
86 // numberOfItems
87 //
88 //*********************************************************************************
89 
90 unsigned long IOPMPowerSourceList::numberOfItems ( void )
91 {
92     return length;
93 }
94 
95 //*********************************************************************************
96 // removeFromList
97 //
98 // Find the item in the list, unlink it, and free it.
99 //*********************************************************************************
100 
101 IOReturn IOPMPowerSourceList::removeFromList ( IOPMPowerSource * theItem )
102 {
103     IOPMPowerSource * item = firstItem;
104     IOPMPowerSource * temp;
105 
106     if ( item != NULL ) {
107         if ( item  == theItem ) {
108             firstItem = item->nextInList;
109             length--;
110             item->release();
111             return IOPMNoErr;
112         }
113         while ( item->nextInList != NULL ) {
114             if ( item->nextInList == theItem ) {
115                 temp = item->nextInList;
116                 item->nextInList = temp->nextInList;
117                 length--;
118                 temp->release();
119                 return IOPMNoErr;
120             }
121             item = item->nextInList;
122         }
123     }
124     return IOPMNoErr;
125 }
126 
127 
128 //*********************************************************************************
129 // free
130 //
131 // Free all items in the list, and then free the list itself
132 //*********************************************************************************
133 
134 void IOPMPowerSourceList::free (void )
135 {
136     IOPMPowerSource * next = firstItem;
137 
138     while ( next != NULL ) {
139         firstItem = next->nextInList;
140         length--;
141         next->release();
142         next = firstItem;
143     }
144 super::free();
145 }
146 
147 
148 
149 
150 
151 
152 
153