aga: Simple test graphs

[ccan] / ccan / aga / test / chain.c

diff --git a/ccan/aga/test/chain.c b/ccan/aga/test/chain.c
new file mode 100644 (file)
index 0000000..fbb0f90
--- /dev/null
+++ b/ccan/aga/test/chain.c
@@ -0,0 +1,27 @@
+#include "config.h"
+
+#include <stdlib.h>
+
+#include <ccan/container_of/container_of.h>
+
+#include <ccan/aga/aga.h>
+
+#include "simple-graph.h"
+
+static int chain_edge_info(const struct aga_graph *g,
+                          const struct aga_node *node,
+                          struct aga_node *edge,
+                          struct aga_edge_info *ei)
+{
+       if ((edge == node + 1) || (node == edge + 1))
+               ei->to = edge;
+
+       return 0;
+}
+
+void chain_graph_init(struct chain_graph *cg, int nnodes)
+{
+       cg->fg.nnodes = nnodes;
+       simple_graph_init(&cg->fg.sg, full_first_edge, full_next_edge,
+                         chain_edge_info);
+}