1 files changed, 43 insertions, 0 deletions
diff --git a/src/nvim/yankmap.c b/src/nvim/yankmap.c
new file mode 100644
index 0000000000..c5b8ca8838
--- /dev/null
+++ b/src/nvim/yankmap.c
@@ -0,0 +1,43 @@
+#include "nvim/yankmap.h"
+
+#include "nvim/memory.h"
+
+void init_yankmap(yankmap_T* map)
+{
+  memset(map, 0, sizeof(yankmap_T));
+
+  map_init(int, ptr_t, &map->reg_to_yankreg);
+  map_init(ptr_t, int, &map->yankreg_to_reg);
+}
+
+yankreg_T* yankmap_get(yankmap_T* yankmap, int reg)
+{
+  yankreg_T** ret =
+    (yankreg_T**) map_ref(int, ptr_t)(&yankmap->reg_to_yankreg, reg, true);
+
+  if (ret) {
+    if (! (*ret)) {
+      *ret = xcalloc(sizeof(yankreg_T), 1);
+      (*ret)->name = reg;
+    }
+
+    /* Add the back-reference */
+    int* ref = map_ref(ptr_t, int)(&yankmap->yankreg_to_reg, *ret, true);
+    *ref = reg;
+
+    return *ret;
+  }
+
+  return NULL;
+}
+
+int yankmap_find(yankmap_T* yankmap, yankreg_T* yankreg)
+{
+  int* ref = map_ref(ptr_t, int)(&yankmap->yankreg_to_reg, yankreg, false);
+
+  if (ref) {
+    return *ref;
+  }
+
+  return -1;
+}