1 /*
2  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
3  *
4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5  *
6  * This file contains Original Code and/or Modifications of Original Code
7  * as defined in and that are subject to the Apple Public Source License
8  * Version 2.0 (the 'License'). You may not use this file except in
9  * compliance with the License. The rights granted to you under the License
10  * may not be used to create, or enable the creation or redistribution of,
11  * unlawful or unlicensed copies of an Apple operating system, or to
12  * circumvent, violate, or enable the circumvention or violation of, any
13  * terms of an Apple operating system software license agreement.
14  *
15  * Please obtain a copy of the License at
16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
17  *
18  * The Original Code and all software distributed under the License are
19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23  * Please see the License for the specific language governing rights and
24  * limitations under the License.
25  *
26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27  */
28 #include <IOKit/pwr_mgt/IOPM.h>
29 #include <IOKit/pwr_mgt/IOPMPowerSourceList.h>
30 #include <IOKit/pwr_mgt/IOPMPowerSource.h>
31 
32 #define super OSObject
33 OSDefineMetaClassAndStructors(IOPMPowerSourceList,OSObject)
34 
35 //******************************************************************************
36 // init
37 //
38 //******************************************************************************
39 void IOPMPowerSourceList::initialize ( void )
40 {
41     firstItem = NULL;
42     length = 0;
43 }
44 
45 //******************************************************************************
46 // addToList
47 //
48 //******************************************************************************
49 
50 IOReturn IOPMPowerSourceList::addToList(IOPMPowerSource *newPowerSource)
51 {
52     IOPMPowerSource * nextPowerSource;
53 
54     // Is new object already in the list?
55     nextPowerSource = firstItem;
56     while (  nextPowerSource != NULL )
57     {
58         if ( nextPowerSource == newPowerSource )
59         {
60             // yes, just return
61             return IOPMNoErr;
62         }
63         nextPowerSource = nextInList(nextPowerSource);
64     }
65 
66     // add it to list
67     newPowerSource->nextInList = firstItem;
68     firstItem = newPowerSource;
69     length++;
70     return IOPMNoErr;
71 }
72 
73 
74 //******************************************************************************
75 // firstInList
76 //
77 //******************************************************************************
78 
79 IOPMPowerSource * IOPMPowerSourceList::firstInList ( void )
80 {
81     return firstItem;
82 }
83 
84 //******************************************************************************
85 // nextInList
86 //
87 //******************************************************************************
88 
89 IOPMPowerSource * IOPMPowerSourceList::nextInList(IOPMPowerSource *currentItem)
90 {
91     if ( currentItem != NULL ) {
92        return (currentItem->nextInList);
93     }
94     return NULL;
95 }
96 
97 //******************************************************************************
98 // numberOfItems
99 //
100 //******************************************************************************
101 
102 unsigned long IOPMPowerSourceList::numberOfItems ( void )
103 {
104     return length;
105 }
106 
107 //******************************************************************************
108 // removeFromList
109 //
110 // Find the item in the list, unlink it, and free it.
111 //******************************************************************************
112 
113 IOReturn IOPMPowerSourceList::removeFromList ( IOPMPowerSource * theItem )
114 {
115     IOPMPowerSource * item = firstItem;
116     IOPMPowerSource * temp;
117 
118     if ( NULL == item) goto exit;
119 
120     if ( item  == theItem ) {
121         firstItem = item->nextInList;
122         length--;
123         item->release();
124         return IOPMNoErr;
125     }
126     while ( item->nextInList != NULL ) {
127         if ( item->nextInList == theItem ) {
128             temp = item->nextInList;
129             item->nextInList = temp->nextInList;
130             length--;
131             temp->release();
132             return IOPMNoErr;
133         }
134         item = item->nextInList;
135     }
136 
137 exit:
138     return IOPMNoErr;
139 }
140 
141 
142 //******************************************************************************
143 // free
144 //
145 // Free all items in the list, and then free the list itself
146 //******************************************************************************
147 
148 void IOPMPowerSourceList::free (void )
149 {
150     IOPMPowerSource * next = firstItem;
151 
152     while ( next != NULL ) {
153         firstItem = next->nextInList;
154         length--;
155         next->release();
156         next = firstItem;
157     }
158     super::free();
159 }
160 
161 
162 
163 
164 
165 
166 
167