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| 1 | jermar | 1 | /* |
| 2 | * Copyright (C) 2004 Jakub Jermar |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 1248 | jermar | 29 | /** |
| 30 | * @file list.c |
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| 31 | * @brief Functions completing doubly linked circular list implementaion. |
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| 32 | * |
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| 33 | * This file contains some of the functions implementing doubly linked circular lists. |
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| 34 | * However, this ADT is mostly implemented in @ref list.h. |
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| 35 | */ |
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| 36 | |||
| 788 | jermar | 37 | #include <adt/list.h> |
| 1 | jermar | 38 | |
| 62 | decky | 39 | /** Check for membership |
| 40 | * |
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| 41 | * Check whether link is contained in the list head. |
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| 42 | * The membership is defined as pointer equivalence. |
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| 43 | * |
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| 44 | * @param link Item to look for. |
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| 45 | * @param head List to look in. |
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| 46 | * |
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| 67 | decky | 47 | * @return true if link is contained in head, false otherwise. |
| 62 | decky | 48 | * |
| 49 | */ |
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| 67 | decky | 50 | bool list_member(const link_t *link, const link_t *head) |
| 1 | jermar | 51 | { |
| 67 | decky | 52 | bool found = false; |
| 1 | jermar | 53 | link_t *hlp = head->next; |
| 54 | |||
| 55 | while (hlp != head) { |
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| 56 | if (hlp == link) { |
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| 67 | decky | 57 | found = true; |
| 1 | jermar | 58 | break; |
| 59 | } |
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| 60 | hlp = hlp->next; |
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| 61 | } |
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| 62 | |||
| 63 | return found; |
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| 64 | } |
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| 65 | |||
| 62 | decky | 66 | |
| 67 | /** Concatenate two lists |
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| 68 | * |
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| 69 | * Concatenate lists head1 and head2, producing a single |
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| 70 | * list head1 containing items from both (in head1, head2 |
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| 71 | * order) and empty list head2. |
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| 72 | * |
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| 73 | * @param head1 First list and concatenated output |
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| 74 | * @param head2 Second list and empty output. |
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| 75 | * |
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| 76 | */ |
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| 1 | jermar | 77 | void list_concat(link_t *head1, link_t *head2) |
| 78 | { |
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| 79 | if (list_empty(head2)) |
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| 80 | return; |
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| 81 | |||
| 82 | head2->next->prev = head1->prev; |
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| 83 | head2->prev->next = head1; |
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| 84 | head1->prev->next = head2->next; |
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| 85 | head1->prev = head2->prev; |
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| 86 | list_initialize(head2); |
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| 87 | } |