X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/ad5a61715d2113a2b341b6e867e65588dd4faf68..8a67f74657d886d80a3512beb8b9b522fd3e9d13:/src/xbt/graph.c

diff --git a/src/xbt/graph.c b/src/xbt/graph.c
index 22a91260fc..0c8325a789 100644
--- a/src/xbt/graph.c
+++ b/src/xbt/graph.c
@@ -1 +1,303 @@
+/* a generic graph library.                                                 */
+
+/* Copyright (c) 2006-2014. The SimGrid Team.
+ * All rights reserved.                                                     */
+
+/* This program is free software; you can redistribute it and/or modify it
+ * under the terms of the license (GNU LGPL) which comes with this package. */
+
+#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 <stdlib.h>
+
+XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_graph, xbt, "Graph");
+
+/** @brief Constructor
+ *  @return a new 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);
+  graph->directed = directed;
+  graph->data = data;
+  graph->nodes = xbt_dynar_new(sizeof(xbt_node_t), NULL);
+  graph->edges = xbt_dynar_new(sizeof(xbt_edge_t), NULL);
+
+  return graph;
+}
+
+/** @brief add a node to the given graph */
+xbt_node_t xbt_graph_new_node(xbt_graph_t g, void *data)
+{
+  xbt_node_t node = NULL;
+  node = xbt_new0(struct xbt_node, 1);
+  node->data = data;
+  if (g->directed)
+    /* only the "out" field is used */
+    node->in = xbt_dynar_new(sizeof(xbt_edge_t), NULL);
+
+  node->out = xbt_dynar_new(sizeof(xbt_edge_t), NULL);
+  node->position_x = -1.0;
+  node->position_y = -1.0;
+
+  xbt_dynar_push(g->nodes, &node);
+
+  return node;
+}
+
+/** @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 edge = NULL;
+
+  edge = xbt_new0(struct xbt_edge, 1);
+  xbt_dynar_push(src->out, &edge);
+  if (g->directed)
+    xbt_dynar_push(dst->in, &edge);
+  else                          /* only the "out" field is used */
+    xbt_dynar_push(dst->out, &edge);
+
+  edge->data = data;
+  edge->src = src;
+  edge->dst = dst;
+
+  xbt_dynar_push(g->edges, &edge);
+
+  return 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 edge;
+  unsigned int cursor;
+
+  xbt_dynar_foreach(src->out, cursor, edge) {
+    XBT_DEBUG("%p = %p--%p", edge, edge->src, edge->dst);
+    if ((edge->src == src) && (edge->dst == dst))
+      return edge;
+  }
+  if (!g->directed) {
+    xbt_dynar_foreach(src->out, cursor, edge) {
+      XBT_DEBUG("%p = %p--%p", edge, edge->src, edge->dst);
+      if ((edge->dst == src) && (edge->src == dst))
+        return edge;
+    }
+  }
+  return NULL;
+}
+
+/** @brief Get the user data associated to a node */
+void *xbt_graph_node_get_data(xbt_node_t node)
+{
+  return node->data;
+}
+
+/** @brief Set the user data associated to a node */
+void xbt_graph_node_set_data(xbt_node_t node, void *data)
+{
+  node->data = data;
+}
+
+/** @brief Get the user data associated to a edge */
+void *xbt_graph_edge_get_data(xbt_edge_t edge)
+{
+  return edge->data;
+}
+
+/** @brief Set the user data associated to a edge */
+void xbt_graph_edge_set_data(xbt_edge_t edge, void *data)
+{
+  edge->data = data;
+}
+
+/** @brief Destructor
+ *  @param g: poor victim
+ *  @param node_free_function: function to use to free data associated to each node
+ *  @param edge_free_function: function to use to free data associated to each edge
+ *  @param graph_free_function: function to use to free data associated to g
+ *
+ * Free the graph structure.
+ */
+void xbt_graph_free_graph(xbt_graph_t g, void_f_pvoid_t node_free_function, void_f_pvoid_t edge_free_function,
+                          void_f_pvoid_t graph_free_function)
+{
+  unsigned int cursor;
+  xbt_node_t node;
+  xbt_edge_t edge;
+
+  xbt_dynar_foreach(g->edges, cursor, edge) {
+    if (edge_free_function)
+      edge_free_function(edge->data);
+    free(edge);
+  }
+  xbt_dynar_free(&(g->edges));
+
+  xbt_dynar_foreach(g->nodes, cursor, node) {
+    xbt_dynar_free(&(node->out));
+    xbt_dynar_free(&(node->in));
+    if (node_free_function)
+      node_free_function(node->data);
+    free(node);
+  }
+  xbt_dynar_free(&(g->nodes));
+
+  if (graph_free_function)
+    graph_free_function(g->data);
+  free(g);
+}
+
+/** @brief Retrieve the graph's nodes as a dynar */
+xbt_dynar_t xbt_graph_get_nodes(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)
+{
+  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)
+{
+  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)
+{
+  return e->dst;
+}
+
+/** @brief Retrieve the outgoing edges of the given node */
+xbt_dynar_t xbt_graph_node_get_outedges(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);
+}