agar: Re-entrant Abstract Graph Algorithms

[ccan] / ccan / agar / test / error-graph.c

diff --git a/ccan/agar/test/error-graph.c b/ccan/agar/test/error-graph.c
new file mode 100644 (file)
index 0000000..efd83a3
--- /dev/null
+++ b/ccan/agar/test/error-graph.c
@@ -0,0 +1,55 @@
+#include "config.h"
+
+#include <assert.h>
+
+#include <ccan/agar/agar.h>
+#include <ccan/container_of/container_of.h>
+#include <ccan/ptrint/ptrint.h>
+
+#include "simple-graphr.h"
+
+static const void *error_first_edge_r(const struct agar_graph *gr,
+                                     const void *nr)
+{
+       return int2ptr(1);
+}
+
+static const void *error_next_edge_r(const struct agar_graph *gr,
+                                    const void *nr, const void *e)
+{
+       assert(ptr2int(e) == 1);
+
+       return NULL;
+}
+
+static int error_edge_info_r(const struct agar_graph *gr,
+                            const void *nr, const void *e,
+                            struct agar_edge_info *eir)
+{
+       int fromindex = ptr2int(nr);
+
+       switch (fromindex) {
+       case 1:
+               eir->to = int2ptr(2);
+               break;
+
+       case 2:
+               eir->to = NULL;
+               break;
+
+       case 3:
+               eir->to = int2ptr(4);
+               break;
+
+       default:
+               return -1;
+       }
+
+       return 0;
+}
+
+void error_graphr_init(struct error_graphr *egr)
+{
+       agar_init_graph(&egr->gr, error_first_edge_r, error_next_edge_r,
+                       error_edge_info_r);
+}