120 lines
2.7 KiB
C
120 lines
2.7 KiB
C
/*
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hooks.c -- hooks management
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Copyright (C) 2002 Guus Sliepen <guus@sliepen.warande.net>,
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2002 Ivo Timmermans <ivo@o2w.nl>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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$Id: hooks.c,v 1.2 2002/05/02 11:50:07 zarq Exp $
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*/
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#include "config.h"
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#include <assert.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <avl_tree.h>
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#include <hooks.h>
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#include <xalloc.h>
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avl_tree_t *hooks_tree = NULL;
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struct hooks_node {
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const char *type;
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avl_tree_t *hooks;
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} hooks_node;
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static int hook_type_compare(const void *a, const void *b)
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{
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return strcmp(((const struct hooks_node*)a)->type,
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((const struct hooks_node*)b)->type);
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}
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static int hook_dummy_compare(const void *a, const void *b)
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{
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if(a < b)
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return -1;
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if(a > b)
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return 1;
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return 0;
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}
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void run_hooks(const char *type, ...)
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{
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avl_node_t *avlnode;
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va_list args;
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struct hooks_node *hn;
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struct hooks_node target;
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if(!hooks_tree)
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return;
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target.type = type;
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hn = (struct hooks_node*)avl_search(hooks_tree, &target);
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if(!hn || !(hn->hooks->head))
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{
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fprintf(stderr, "Warning, no hooks found for `%s'\n", type);
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return;
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}
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va_start(args, type);
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for(avlnode = hn->hooks->head; avlnode; avlnode = avlnode->next)
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{
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assert(avlnode->data);
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((hook_function_t*)(avlnode->data))(type, args);
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}
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va_end(args);
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}
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void add_hook(const char *type, hook_function_t *hook)
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{
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struct hooks_node *hn;
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struct hooks_node target;
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if(!hooks_tree)
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hooks_tree = avl_alloc_tree(hook_type_compare, NULL);
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target.type = type;
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hn = avl_search(hooks_tree, &target);
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if(!hn)
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{
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avl_tree_t *t;
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hn = xmalloc(sizeof(struct hooks_node));
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t = avl_alloc_tree(hook_dummy_compare, NULL);
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hn->type = type;
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hn->hooks = t;
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avl_insert(hooks_tree, (void*)hn);
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}
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avl_insert(hn->hooks, (void*)hook);
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}
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void del_hook(const char *type, hook_function_t *hook)
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{
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avl_tree_t *t;
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struct hooks_node target;
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if(!hooks_tree)
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return;
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target.type = type;
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t = avl_search(hooks_tree, &target);
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if(!t)
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return;
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avl_delete(t, (void*)hook);
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}
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