Subversion Repositories HelenOS

Rev

Rev 4509 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
996 cejka 1
/*
2071 jermar 2
 * Copyright (c) 2004 Jakub Jermar
996 cejka 3
 * All rights reserved.
4
 *
5
 * Redistribution and use in source and binary forms, with or without
6
 * modification, are permitted provided that the following conditions
7
 * are met:
8
 *
9
 * - Redistributions of source code must retain the above copyright
10
 *   notice, this list of conditions and the following disclaimer.
11
 * - Redistributions in binary form must reproduce the above copyright
12
 *   notice, this list of conditions and the following disclaimer in the
13
 *   documentation and/or other materials provided with the distribution.
14
 * - The name of the author may not be used to endorse or promote products
15
 *   derived from this software without specific prior written permission.
16
 *
17
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
 */
28
 
1866 jermar 29
/** @addtogroup libc
1653 cejka 30
 * @{
31
 */
32
/** @file
33
 */
34
 
4509 decky 35
#include <adt/list.h>
996 cejka 36
 
37
 
38
/** Check for membership
39
 *
40
 * Check whether link is contained in the list head.
41
 * The membership is defined as pointer equivalence.
42
 *
43
 * @param link Item to look for.
44
 * @param head List to look in.
45
 *
46
 * @return true if link is contained in head, false otherwise.
47
 *
48
 */
49
int list_member(const link_t *link, const link_t *head)
50
{
4415 decky 51
    int found = 0;
996 cejka 52
    link_t *hlp = head->next;
53
 
54
    while (hlp != head) {
55
        if (hlp == link) {
4415 decky 56
            found = 1;
996 cejka 57
            break;
58
        }
59
        hlp = hlp->next;
60
    }
61
 
62
    return found;
63
}
64
 
65
 
66
/** Concatenate two lists
67
 *
68
 * Concatenate lists head1 and head2, producing a single
69
 * list head1 containing items from both (in head1, head2
70
 * order) and empty list head2.
71
 *
72
 * @param head1 First list and concatenated output
73
 * @param head2 Second list and empty output.
74
 *
75
 */
76
void list_concat(link_t *head1, link_t *head2)
77
{
78
    if (list_empty(head2))
79
        return;
4415 decky 80
 
996 cejka 81
    head2->next->prev = head1->prev;
4415 decky 82
    head2->prev->next = head1;
996 cejka 83
    head1->prev->next = head2->next;
84
    head1->prev = head2->prev;
85
    list_initialize(head2);
86
}
1653 cejka 87
 
4415 decky 88
 
89
/** Count list items
90
 *
91
 * Return the number of items in the list.
92
 *
93
 * @param link List to count.
94
 *
95
 * @return Number of items in the list.
96
 *
97
 */
98
unsigned int list_count(const link_t *link)
99
{
100
    unsigned int count = 0;
101
    link_t *hlp = link->next;
102
 
103
    while (hlp != link) {
104
        count++;
105
        hlp = hlp->next;
106
    }
107
 
108
    return count;
109
}
110
 
1866 jermar 111
/** @}
1653 cejka 112
 */