Subversion Repositories HelenOS

Rev

Rev 4509 | Go to most recent revision | 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 
 */