agar: Re-entrant Abstract Graph Algorithms

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

diff --git a/ccan/agar/test/chain.c b/ccan/agar/test/chain.c
new file mode 100644 (file)
index 0000000..e563dea
--- /dev/null
+++ b/ccan/agar/test/chain.c
@@ -0,0 +1,30 @@
+#include "config.h"
+
+#include <stdlib.h>
+
+#include <ccan/container_of/container_of.h>
+#include <ccan/ptrint/ptrint.h>
+
+#include <ccan/agar/agar.h>
+
+#include "simple-graphr.h"
+
+static int chain_edge_info_r(const struct agar_graph *gr,
+                            const void *nr, const void *e,
+                            struct agar_edge_info *eir)
+{
+       int fromi = ptr2int(nr);
+       int toi = ptr2int(e);
+
+       if ((toi == fromi + 1) || (fromi == toi + 1))
+               eir->to = int2ptr(toi);
+
+       return 0;
+}
+
+void chain_graphr_init(struct chain_graphr *cgr, int nnodes)
+{
+       cgr->fgr.nnodes = nnodes;
+       agar_init_graph(&cgr->fgr.gr, full_first_edge_r, full_next_edge_r,
+                       chain_edge_info_r);
+}