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460b9539 | 1 | /* |
2 | * This file is part of DisOrder | |
65bb0fff | 3 | * Copyright (C) 2006, 2007 Richard Kettlewell |
460b9539 | 4 | * |
e7eb3a27 | 5 | * This program is free software: you can redistribute it and/or modify |
460b9539 | 6 | * it under the terms of the GNU General Public License as published by |
e7eb3a27 | 7 | * the Free Software Foundation, either version 3 of the License, or |
460b9539 | 8 | * (at your option) any later version. |
e7eb3a27 RK |
9 | * |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
460b9539 | 15 | * You should have received a copy of the GNU General Public License |
e7eb3a27 | 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
460b9539 | 17 | */ |
65bb0fff RK |
18 | /** @file lib/selection.c |
19 | * @brief Select management for Disobedience | |
20 | */ | |
460b9539 | 21 | |
05b75f8d | 22 | #include "common.h" |
460b9539 | 23 | |
24 | #include "mem.h" | |
25 | #include "hash.h" | |
26 | #include "selection.h" | |
27 | ||
65bb0fff RK |
28 | /** @brief Create a new selection manager |
29 | * @return Pointer to @ref hash used to manage the selection | |
30 | */ | |
460b9539 | 31 | hash *selection_new(void) { |
32 | return hash_new(sizeof (int)); | |
33 | } | |
34 | ||
65bb0fff RK |
35 | /** @brief Add or remove a key in a selection |
36 | * @param h Hash representing selection | |
37 | * @param key Key to insert | |
38 | * @param selected non-0 if key is selected, 0 if it is not | |
39 | * | |
40 | * @p key is copied so the pointer need not remain valid. Newly selected keys | |
41 | * are not marked as live. | |
42 | */ | |
460b9539 | 43 | void selection_set(hash *h, const char *key, int selected) { |
4a99f7ba RK |
44 | if(selected) { |
45 | int *const liveness = xmalloc_noptr(sizeof (int)); | |
46 | *liveness = 0; | |
47 | hash_add(h, key, liveness, HASH_INSERT_OR_REPLACE); | |
48 | } else | |
460b9539 | 49 | hash_remove(h, key); |
50 | } | |
51 | ||
65bb0fff RK |
52 | /** @brief Test whether a key is set in a selection |
53 | * @param h Hash representing selection | |
54 | * @param key Key to check | |
55 | * @return non-0 if key is present, 0 if it is not | |
56 | */ | |
460b9539 | 57 | int selection_selected(hash *h, const char *key) { |
58 | return hash_find(h, key) != 0; | |
59 | } | |
60 | ||
65bb0fff RK |
61 | /** @brief Invert a key's selection status |
62 | * @param h Hash representing selection | |
63 | * @param key Key to flip | |
64 | * | |
65 | * If the key is selected as a result it is not marked as live. | |
66 | */ | |
460b9539 | 67 | void selection_flip(hash *h, const char *key) { |
68 | selection_set(h, key, !selection_selected(h, key)); | |
69 | } | |
70 | ||
65bb0fff RK |
71 | /** @brief Mark a selection key as live |
72 | * @param h Hash representing selection | |
73 | * @param key Key to mark as live | |
74 | * | |
75 | * Live keys will survive a call to selection_cleanup(). @p need not be in the | |
76 | * selection (if it is not then the call will be ignored). | |
77 | */ | |
460b9539 | 78 | void selection_live(hash *h, const char *key) { |
79 | int *ptr = hash_find(h, key); | |
80 | ||
81 | if(ptr) | |
82 | *ptr = 1; | |
83 | } | |
84 | ||
85 | static int selection_cleanup_callback(const char *key, | |
86 | void *value, | |
87 | void *v) { | |
88 | if(*(int *)value) | |
89 | *(int *)value = 0; | |
90 | else | |
91 | hash_remove((hash *)v, key); | |
92 | return 0; | |
93 | } | |
94 | ||
65bb0fff RK |
95 | /** @brief Delete all non-live keys from a selection |
96 | * @param h Hash representing selection | |
97 | * | |
4a99f7ba | 98 | * After cleanup, no keys are marked as live. |
65bb0fff | 99 | */ |
460b9539 | 100 | void selection_cleanup(hash *h) { |
101 | hash_foreach(h, selection_cleanup_callback, h); | |
102 | } | |
103 | ||
104 | static int selection_empty_callback(const char *key, | |
105 | void attribute((unused)) *value, | |
106 | void *v) { | |
107 | hash_remove((hash *)v, key); | |
108 | return 0; | |
109 | } | |
110 | ||
65bb0fff RK |
111 | /** @brief Remove all keys from a selection |
112 | * @param h Hash representing selection | |
113 | */ | |
460b9539 | 114 | void selection_empty(hash *h) { |
115 | hash_foreach(h, selection_empty_callback, h); | |
116 | } | |
117 | ||
118 | /* | |
119 | Local Variables: | |
120 | c-basic-offset:2 | |
121 | comment-column:40 | |
122 | fill-column:79 | |
123 | indent-tabs-mode:nil | |
124 | End: | |
125 | */ |