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
33OSDefineMetaClassAndStructors(IOPMPowerSourceList,OSObject)
34
35//******************************************************************************
36// init
37//
38//******************************************************************************
39void IOPMPowerSourceList::initialize ( void )
40{
41    firstItem = NULL;
42    length = 0;
43}
44
45//******************************************************************************
46// addToList
47//
48//******************************************************************************
49
50IOReturn 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
79IOPMPowerSource * IOPMPowerSourceList::firstInList ( void )
80{
81    return firstItem;
82}
83
84//******************************************************************************
85// nextInList
86//
87//******************************************************************************
88
89IOPMPowerSource * 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
102unsigned 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
113IOReturn 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
137exit:
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
148void 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}
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