| 1 | /* |
| 2 | * This file is part of DisOrder |
| 3 | * Copyright (C) 2006, 2007 Richard Kettlewell |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, but |
| 11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
| 18 | * USA |
| 19 | */ |
| 20 | /** @file lib/selection.c |
| 21 | * @brief Select management for Disobedience |
| 22 | */ |
| 23 | |
| 24 | #include <config.h> |
| 25 | #include "types.h" |
| 26 | |
| 27 | #include "mem.h" |
| 28 | #include "hash.h" |
| 29 | #include "selection.h" |
| 30 | |
| 31 | /** @brief Create a new selection manager |
| 32 | * @return Pointer to @ref hash used to manage the selection |
| 33 | */ |
| 34 | hash *selection_new(void) { |
| 35 | return hash_new(sizeof (int)); |
| 36 | } |
| 37 | |
| 38 | /** @brief Add or remove a key in a selection |
| 39 | * @param h Hash representing selection |
| 40 | * @param key Key to insert |
| 41 | * @param selected non-0 if key is selected, 0 if it is not |
| 42 | * |
| 43 | * @p key is copied so the pointer need not remain valid. Newly selected keys |
| 44 | * are not marked as live. |
| 45 | */ |
| 46 | void selection_set(hash *h, const char *key, int selected) { |
| 47 | if(selected) { |
| 48 | int *const liveness = xmalloc_noptr(sizeof (int)); |
| 49 | *liveness = 0; |
| 50 | hash_add(h, key, liveness, HASH_INSERT_OR_REPLACE); |
| 51 | } else |
| 52 | hash_remove(h, key); |
| 53 | } |
| 54 | |
| 55 | /** @brief Test whether a key is set in a selection |
| 56 | * @param h Hash representing selection |
| 57 | * @param key Key to check |
| 58 | * @return non-0 if key is present, 0 if it is not |
| 59 | */ |
| 60 | int selection_selected(hash *h, const char *key) { |
| 61 | return hash_find(h, key) != 0; |
| 62 | } |
| 63 | |
| 64 | /** @brief Invert a key's selection status |
| 65 | * @param h Hash representing selection |
| 66 | * @param key Key to flip |
| 67 | * |
| 68 | * If the key is selected as a result it is not marked as live. |
| 69 | */ |
| 70 | void selection_flip(hash *h, const char *key) { |
| 71 | selection_set(h, key, !selection_selected(h, key)); |
| 72 | } |
| 73 | |
| 74 | /** @brief Mark a selection key as live |
| 75 | * @param h Hash representing selection |
| 76 | * @param key Key to mark as live |
| 77 | * |
| 78 | * Live keys will survive a call to selection_cleanup(). @p need not be in the |
| 79 | * selection (if it is not then the call will be ignored). |
| 80 | */ |
| 81 | void selection_live(hash *h, const char *key) { |
| 82 | int *ptr = hash_find(h, key); |
| 83 | |
| 84 | if(ptr) |
| 85 | *ptr = 1; |
| 86 | } |
| 87 | |
| 88 | static int selection_cleanup_callback(const char *key, |
| 89 | void *value, |
| 90 | void *v) { |
| 91 | if(*(int *)value) |
| 92 | *(int *)value = 0; |
| 93 | else |
| 94 | hash_remove((hash *)v, key); |
| 95 | return 0; |
| 96 | } |
| 97 | |
| 98 | /** @brief Delete all non-live keys from a selection |
| 99 | * @param h Hash representing selection |
| 100 | * |
| 101 | * After cleanup, no keys are marked as live. |
| 102 | */ |
| 103 | void selection_cleanup(hash *h) { |
| 104 | hash_foreach(h, selection_cleanup_callback, h); |
| 105 | } |
| 106 | |
| 107 | static int selection_empty_callback(const char *key, |
| 108 | void attribute((unused)) *value, |
| 109 | void *v) { |
| 110 | hash_remove((hash *)v, key); |
| 111 | return 0; |
| 112 | } |
| 113 | |
| 114 | /** @brief Remove all keys from a selection |
| 115 | * @param h Hash representing selection |
| 116 | */ |
| 117 | void selection_empty(hash *h) { |
| 118 | hash_foreach(h, selection_empty_callback, h); |
| 119 | } |
| 120 | |
| 121 | /* |
| 122 | Local Variables: |
| 123 | c-basic-offset:2 |
| 124 | comment-column:40 |
| 125 | fill-column:79 |
| 126 | indent-tabs-mode:nil |
| 127 | End: |
| 128 | */ |