2 edge.c -- edge tree management
3 Copyright (C) 2000,2001 Guus Sliepen <guus@sliepen.warande.net>,
4 2000,2001 Ivo Timmermans <itimmermans@bigfoot.com>
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: edge.c,v 1.1.2.5 2001/11/16 12:21:49 zarq Exp $
32 #include "net.h" /* Don't ask. */
41 avl_tree_t *edge_tree; /* Tree with all known edges (replaces active_tree) */
42 avl_tree_t *edge_weight_tree; /* Tree with all edges, sorted on weight */
44 int edge_compare(edge_t *a, edge_t *b)
48 result = strcmp(a->from->name, b->from->name);
53 return strcmp(a->to->name, b->to->name);
56 /* Evil edge_compare() from a parallel universe ;)
58 int edge_compare(edge_t *a, edge_t *b)
62 return (result = strcmp(a->from->name, b->from->name)) || (result = strcmp(a->to->name, b->to->name)), result;
67 int edge_name_compare(edge_t *a, edge_t *b)
70 char *name_a1, *name_a2, *name_b1, *name_b2;
72 if(strcmp(a->from->name, a->to->name) < 0)
73 name_a1 = a->from->name, name_a2 = a->to->name;
75 name_a1 = a->to->name, name_a2 = a->from->name;
77 if(strcmp(b->from->name, b->to->name) < 0)
78 name_b1 = b->from->name, name_b2 = b->to->name;
80 name_b1 = b->to->name, name_b2 = b->from->name;
82 result = strcmp(name_a1, name_b1);
87 return strcmp(name_a2, name_b2);
90 int edge_weight_compare(edge_t *a, edge_t *b)
94 result = a->weight - b->weight;
99 return edge_name_compare(a, b);
102 void init_edges(void)
105 edge_tree = avl_alloc_tree((avl_compare_t)edge_compare, NULL);
106 edge_weight_tree = avl_alloc_tree((avl_compare_t)edge_weight_compare, NULL);
110 avl_tree_t *new_edge_tree(void)
113 return avl_alloc_tree((avl_compare_t)edge_name_compare, NULL);
117 void free_edge_tree(avl_tree_t *edge_tree)
120 avl_delete_tree(edge_tree);
124 void exit_edges(void)
127 avl_delete_tree(edge_tree);
131 /* Creation and deletion of connection elements */
133 edge_t *new_edge(void)
137 e = (edge_t *)xmalloc_and_zero(sizeof(*e));
142 void free_edge(edge_t *e)
149 void edge_add(edge_t *e)
152 avl_insert(edge_tree, e);
153 avl_insert(edge_weight_tree, e);
154 avl_insert(e->from->edge_tree, e);
155 avl_insert(e->to->edge_tree, e);
159 void edge_del(edge_t *e)
162 avl_delete(edge_tree, e);
163 avl_delete(edge_weight_tree, e);
164 avl_delete(e->from->edge_tree, e);
165 avl_delete(e->to->edge_tree, e);
169 edge_t *lookup_edge(node_t *from, node_t *to)
176 result = avl_search(edge_tree, &v);
184 return avl_search(edge_tree, &v);
187 void dump_edges(void)
192 syslog(LOG_DEBUG, _("Edges:"));
194 for(node = edge_tree->head; node; node = node->next)
196 e = (edge_t *)node->data;
197 syslog(LOG_DEBUG, _(" %s - %s options %ld weight %d"),
198 e->from->name, e->to->name, e->options, e->weight);
201 syslog(LOG_DEBUG, _("End of edges."));