/* a generic graph library. */
-/* Copyright (c) 2006-2014. The SimGrid Team.
+/* Copyright (c) 2006-2020. The SimGrid Team.
* All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
#include "xbt/sysdep.h"
#include "xbt/log.h"
#include "xbt/graph.h"
-#include "graph_private.h"
#include "xbt/dict.h"
-#include "xbt/heap.h"
-#include "xbt/str.h"
-#include "xbt/file.h"
#include <errno.h>
+#include <stdio.h>
#include <stdlib.h>
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_graph, xbt, "Graph");
*/
xbt_graph_t xbt_graph_new_graph(unsigned short int directed, void *data)
{
- xbt_graph_t graph = NULL;
- graph = xbt_new0(struct xbt_graph, 1);
+ xbt_graph_t graph = xbt_new0(struct xbt_graph, 1);
graph->directed = directed;
graph->data = data;
graph->nodes = xbt_dynar_new(sizeof(xbt_node_t), NULL);
}
/** @brief add a node to the given graph */
-xbt_node_t xbt_graph_new_node(xbt_graph_t g, void *data)
+xbt_node_t xbt_graph_new_node(const s_xbt_graph_t* g, void* data)
{
- xbt_node_t node = NULL;
- node = xbt_new0(struct xbt_node, 1);
+ xbt_node_t node= xbt_new0(struct xbt_node, 1);
node->data = data;
if (g->directed)
/* only the "out" field is used */
}
/** @brief add an edge to the given graph */
-xbt_edge_t xbt_graph_new_edge(xbt_graph_t g, xbt_node_t src, xbt_node_t dst, void *data)
+xbt_edge_t xbt_graph_new_edge(const s_xbt_graph_t* g, xbt_node_t src, xbt_node_t dst, void* data)
{
- xbt_edge_t edge = NULL;
-
- edge = xbt_new0(struct xbt_edge, 1);
+ xbt_edge_t edge = xbt_new0(struct xbt_edge, 1);
xbt_dynar_push(src->out, &edge);
if (g->directed)
xbt_dynar_push(dst->in, &edge);
}
/** @brief Get the edge connecting src and dst */
-xbt_edge_t xbt_graph_get_edge(xbt_graph_t g, xbt_node_t src, xbt_node_t dst)
+xbt_edge_t xbt_graph_get_edge(const s_xbt_graph_t* g, const s_xbt_node_t* src, const s_xbt_node_t* dst)
{
xbt_edge_t edge;
unsigned int cursor;
}
/** @brief Get the user data associated to a node */
-void *xbt_graph_node_get_data(xbt_node_t node)
+void* xbt_graph_node_get_data(const s_xbt_node_t* node)
{
return node->data;
}
}
/** @brief Get the user data associated to a edge */
-void *xbt_graph_edge_get_data(xbt_edge_t edge)
+void* xbt_graph_edge_get_data(const s_xbt_edge_t* edge)
{
return edge->data;
}
}
/** @brief Retrieve the graph's nodes as a dynar */
-xbt_dynar_t xbt_graph_get_nodes(xbt_graph_t g)
+xbt_dynar_t xbt_graph_get_nodes(const s_xbt_graph_t* g)
{
return g->nodes;
}
/** @brief Retrieve the graph's edges as a dynar */
-xbt_dynar_t xbt_graph_get_edges(xbt_graph_t g)
+xbt_dynar_t xbt_graph_get_edges(const s_xbt_graph_t* g)
{
return g->edges;
}
/** @brief Retrieve the node at the source of the given edge */
-xbt_node_t xbt_graph_edge_get_source(xbt_edge_t e)
+xbt_node_t xbt_graph_edge_get_source(const s_xbt_edge_t* e)
{
return e->src;
}
/** @brief Retrieve the node being the target of the given edge */
-xbt_node_t xbt_graph_edge_get_target(xbt_edge_t e)
+xbt_node_t xbt_graph_edge_get_target(const s_xbt_edge_t* e)
{
return e->dst;
}
/** @brief Retrieve the outgoing edges of the given node */
-xbt_dynar_t xbt_graph_node_get_outedges(xbt_node_t n)
+xbt_dynar_t xbt_graph_node_get_outedges(const s_xbt_node_t* n)
{
return n->out;
}
-
-/** @brief Set the weight of the given edge */
-void xbt_graph_edge_set_length(xbt_edge_t e, double length)
-{
- e->length = length;
-
-}
-
-/** @brief Get the length of a edge */
-double xbt_graph_edge_get_length(xbt_edge_t edge)
-{
- return edge->length;
-}
-
-/** @brief Floyd-Warshall algorithm for shortest path finding
- *
- * From wikipedia:
- *
- * The Floyd-Warshall algorithm takes as input an adjacency matrix representation of a weighted, directed graph (V, E).
- * The weight of a path between two vertices is the sum of the weights of the edges along that path. The edges E of the
- * graph may have negative weights, but the graph must not have any negative weight cycles. The algorithm computes, for
- * each pair of vertices, the minimum weight among all paths between the two vertices. The running time complexity is
- * Θ(|V|3).
- */
-void xbt_floyd_algorithm(xbt_graph_t g, double *adj, double *d, xbt_node_t * p)
-{
- unsigned long i, j, k;
- unsigned long n;
- n = xbt_dynar_length(g->nodes);
-
-# define D(u,v) d[(u)*n+(v)]
-# define P(u,v) p[(u)*n+(v)]
-
- for (i = 0; i < n * n; i++) {
- d[i] = adj[i];
- }
-
- for (i = 0; i < n; i++) {
- for (j = 0; j < n; j++) {
- if (D(i, j) != -1) {
- P(i, j) = *((xbt_node_t *) xbt_dynar_get_ptr(g->nodes, i));
- }
- }
- }
-
- for (k = 0; k < n; k++) {
- for (i = 0; i < n; i++) {
- for (j = 0; j < n; j++) {
- if ((D(i, k) != -1) && (D(k, j) != -1)) {
- if ((D(i, j) == -1) || (D(i, j) > D(i, k) + D(k, j))) {
- D(i, j) = D(i, k) + D(k, j);
- P(i, j) = P(k, j);
- }
- }
- }
- }
- }
-# undef P
-# undef D
-}
-
-/** @brief Export the given graph in the GraphViz formatting for visualization */
-void xbt_graph_export_graphviz(xbt_graph_t g, const char *filename, const char *(node_name) (xbt_node_t),
- const char *(edge_name) (xbt_edge_t))
-{
- unsigned int cursor = 0;
- xbt_node_t node = NULL;
- xbt_edge_t edge = NULL;
- FILE *file = NULL;
- const char *name = NULL;
-
- file = fopen(filename, "w");
- xbt_assert(file, "Failed to open %s \n", filename);
-
- if (g->directed)
- fprintf(file, "digraph test {\n");
- else
- fprintf(file, "graph test {\n");
-
- fprintf(file, " graph [overlap=scale]\n");
-
- fprintf(file, " node [shape=box, style=filled]\n");
- fprintf(file, " node [width=.3, height=.3, style=filled, color=skyblue]\n\n");
-
- xbt_dynar_foreach(g->nodes, cursor, node) {
- if (node_name){
- fprintf(file, " \"%s\";\n", node_name(node));
- }else{
- fprintf(file, " \"%p\";\n", node);
- }
- }
- xbt_dynar_foreach(g->edges, cursor, edge) {
- const char *c;
- const char *c_dir = "->";
- const char *c_ndir = "--";
- if (g->directed){
- c = c_dir;
- }else{
- c = c_ndir;
- }
- const char *src_name, *dst_name;
- if (node_name){
- src_name = node_name(edge->src);
- dst_name = node_name(edge->dst);
- fprintf(file, " \"%s\" %s \"%s\"", src_name, c, dst_name);
- }else{
- fprintf(file, " \"%p\" %s \"%p\"", edge->src, c, edge->dst);
- }
-
- if ((edge_name) && ((name = edge_name(edge))))
- fprintf(file, "[label=\"%s\"]", name);
- fprintf(file, ";\n");
- }
- fprintf(file, "}\n");
- fclose(file);
-}
