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https://github.com/radareorg/radare2.git
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235 lines
5.7 KiB
C
235 lines
5.7 KiB
C
/* radare - LGPL - Copyright 2007-2012 - pancake */
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#include <r_util.h>
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enum {
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WHITE_COLOR = 0,
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GRAY_COLOR,
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BLACK_COLOR
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};
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static RGraphNode *r_graph_node_new (void *data) {
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RGraphNode *p = R_NEW0 (RGraphNode);
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p->data = data;
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p->free = NULL;
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p->out_nodes = r_list_new ();
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p->in_nodes = r_list_new ();
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p->all_neighbours = r_list_new ();
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return p;
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}
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static void r_graph_node_free (RGraphNode *n) {
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if (!n) return;
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if (n->free)
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n->free (n->data);
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r_list_free (n->out_nodes);
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r_list_free (n->in_nodes);
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r_list_free (n->all_neighbours);
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free (n);
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}
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static int node_cmp (unsigned int idx, RGraphNode *b) {
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return idx == b->idx ? 0 : -1;
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}
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static void dfs_node (RGraph *g, RGraphNode *n, RGraphVisitor *vis, int color[]) {
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RStack *s;
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RGraphEdge *edg;
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if (g->n_edges == 0)
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return;
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s = r_stack_new (2 * g->n_edges);
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edg = R_NEW (RGraphEdge);
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edg->from = NULL;
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edg->to = n;
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r_stack_push (s, edg);
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while (!r_stack_is_empty (s)) {
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RGraphEdge *cur_edge = (RGraphEdge *)r_stack_pop (s);
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RGraphNode *v, *cur = cur_edge->to, *from = cur_edge->from;
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const RList *neighbours;
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RListIter *it;
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int i;
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if (from && cur) {
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if (color[cur->idx] == WHITE_COLOR && vis->tree_edge)
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vis->tree_edge (cur_edge, vis);
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else if (color[cur->idx] == GRAY_COLOR && vis->back_edge)
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vis->back_edge (cur_edge, vis);
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else if (color[cur->idx] == BLACK_COLOR && vis->fcross_edge)
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vis->fcross_edge (cur_edge, vis);
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} else if (!cur && from) {
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if (color[from->idx] != BLACK_COLOR && vis->finish_node)
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vis->finish_node (from, vis);
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color[from->idx] = BLACK_COLOR;
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}
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free (cur_edge);
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if (!cur || color[cur->idx] != WHITE_COLOR)
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continue;
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if (color[cur->idx] == WHITE_COLOR && vis->discover_node)
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vis->discover_node (cur, vis);
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color[cur->idx] = GRAY_COLOR;
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edg = R_NEW0 (RGraphEdge);
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edg->from = cur;
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r_stack_push (s, edg);
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i = 0;
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neighbours = r_graph_get_neighbours (g, cur);
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r_list_foreach (neighbours, it, v) {
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edg = R_NEW (RGraphEdge);
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edg->from = cur;
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edg->to = v;
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edg->nth = i++;
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r_stack_push (s, edg);
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}
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}
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r_stack_free (s);
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}
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R_API RGraph *r_graph_new () {
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RGraph *t = R_NEW0 (RGraph);
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t->nodes = r_list_new ();
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t->nodes->free = (RListFree)r_graph_node_free;
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t->n_nodes = 0;
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t->last_index = 0;
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return t;
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}
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R_API void r_graph_free (RGraph* t) {
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r_list_free (t->nodes);
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free (t);
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}
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R_API RGraphNode *r_graph_get_node (const RGraph *t, unsigned int idx) {
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RListIter *it = r_list_find (t->nodes, (void *)(size_t)idx, (RListComparator)node_cmp);
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if (!it)
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return NULL;
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return (RGraphNode *)it->data;
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}
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R_API RListIter *r_graph_node_iter (const RGraph *t, unsigned int idx) {
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return r_list_find (t->nodes, (void *)(size_t)idx, (RListComparator)node_cmp);
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}
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R_API void r_graph_reset (RGraph *t) {
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r_list_free (t->nodes);
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t->nodes = r_list_new ();
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t->nodes->free = (RListFree)r_graph_node_free;
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t->n_nodes = 0;
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t->n_edges = 0;
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t->last_index = 0;
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}
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R_API RGraphNode *r_graph_add_node (RGraph *t, void *data) {
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RGraphNode *n = r_graph_node_new (data);
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n->idx = t->last_index++;
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r_list_append (t->nodes, n);
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t->n_nodes++;
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return n;
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}
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/* remove the node from the graph and free the node */
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/* users of this function should be aware they can't access n anymore */
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R_API void r_graph_del_node(RGraph *t, RGraphNode *n) {
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RGraphNode *gn;
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RListIter *it;
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if (!n) return;
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r_list_foreach (n->in_nodes, it, gn) {
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r_list_delete_data (gn->out_nodes, n);
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r_list_delete_data (gn->all_neighbours, n);
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t->n_edges--;
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}
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r_list_foreach (n->out_nodes, it, gn) {
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r_list_delete_data (gn->in_nodes, n);
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r_list_delete_data (gn->all_neighbours, n);
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t->n_edges--;
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}
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r_list_delete_data (t->nodes, n);
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t->n_nodes--;
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}
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R_API void r_graph_add_edge (RGraph *t, RGraphNode *from, RGraphNode *to) {
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r_graph_add_edge_at (t, from, to, -1);
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}
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R_API void r_graph_add_edge_at (RGraph *t, RGraphNode *from, RGraphNode *to, int nth) {
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if (!from || !to) return;
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r_list_insert(from->out_nodes, nth, to);
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r_list_append(from->all_neighbours, to);
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r_list_append(to->in_nodes, from);
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r_list_append(to->all_neighbours, from);
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t->n_edges++;
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}
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R_API void r_graph_del_edge (RGraph *t, RGraphNode *from, RGraphNode *to) {
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if (!from || !to || !r_graph_adjacent (t, from, to)) return;
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r_list_delete_data (from->out_nodes, to);
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r_list_delete_data (from->all_neighbours, to);
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r_list_delete_data (to->in_nodes, from);
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r_list_delete_data (to->all_neighbours, from);
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t->n_edges--;
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}
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R_API const RList *r_graph_get_neighbours (const RGraph *g, const RGraphNode *n) {
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if (!n) return NULL;
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return n->out_nodes;
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}
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R_API RGraphNode *r_graph_nth_neighbour (const RGraph *g, const RGraphNode *n, int nth) {
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if (!n) return NULL;
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return (RGraphNode *)r_list_get_n (n->out_nodes, nth);
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}
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R_API const RList *r_graph_innodes (const RGraph *g, const RGraphNode *n) {
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if (!n) return NULL;
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return n->in_nodes;
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}
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R_API const RList *r_graph_all_neighbours (const RGraph *g, const RGraphNode *n) {
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if (!n) return NULL;
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return n->all_neighbours;
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}
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R_API const RList *r_graph_get_nodes (const RGraph *g) {
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if (!g) return NULL;
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return g->nodes;
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}
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R_API int r_graph_adjacent (const RGraph *g, const RGraphNode *from, const RGraphNode *to) {
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if (!g || !from) return R_FALSE;
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return r_list_contains (from->out_nodes, to) ? R_TRUE : R_FALSE;
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}
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R_API void r_graph_dfs_node (RGraph *g, RGraphNode *n, RGraphVisitor *vis) {
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int *color;
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if (!g || !n || !vis) return;
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color = R_NEWS0 (int, g->last_index);
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dfs_node (g, n, vis, color);
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free (color);
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}
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R_API void r_graph_dfs (RGraph *g, RGraphVisitor *vis) {
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RGraphNode *n;
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RListIter *it;
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int *color;
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if (!g || !vis) return;
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color = R_NEWS0 (int, g->last_index);
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r_list_foreach (g->nodes, it, n) {
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if (color[n->idx] == WHITE_COLOR)
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dfs_node (g, n, vis, color);
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}
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free (color);
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}
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