2 hooks.c -- hooks management
3 Copyright (C) 2002 Guus Sliepen <guus@sliepen.warande.net>,
4 2002 Ivo Timmermans <ivo@o2w.nl>
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 $Id: hooks.c,v 1.1.2.3 2002/04/16 21:24:55 zarq Exp $
33 avl_tree_t *hooks_tree = NULL;
40 static int hook_type_compare(const void *a, const void *b)
42 /* This is not exactly how AVL was meant to be used, but since we
43 only use a limited number of functions, I do this anyway. Assume
44 the left parameter (a) is the value we give as target, the right
45 (b) will be the value in the data pointer of an avl_node_t
46 struct, which is a struct hooks_node in our case. */
47 /* So you should FIXME. */
48 return strcmp((const char*)a,
49 /* ((const struct hooks_node*)a)->type, */
50 ((const struct hooks_node*)b)->type);
53 static int hook_dummy_compare(const void *a, const void *b)
62 void run_hooks(const char *type, ...)
66 struct hooks_node *hn;
70 hn = (struct hooks_node*)avl_search(hooks_tree, type);
73 fprintf(stderr, "Warning, no hooks found for `%s'\n", type);
78 for(avlnode = hn->hooks->head; avlnode; avlnode = avlnode->next)
80 assert(avlnode->data);
81 ((hook_function_t*)(avlnode->data))(type, args);
86 void add_hook(const char *type, hook_function_t *hook)
88 struct hooks_node *hn;
91 hooks_tree = avl_alloc_tree(hook_type_compare, NULL);
93 hn = avl_search(hooks_tree, type);
98 hn = xmalloc(sizeof(struct hooks_node));
99 t = avl_alloc_tree(hook_dummy_compare, NULL);
102 avl_insert(hooks_tree, (void*)hn);
105 avl_insert(hn->hooks, (void*)hook);
108 void del_hook(const char *type, hook_function_t *hook)
115 t = avl_search(hooks_tree, type);
119 avl_delete(t, (void*)hook);