From 4261744537e9d6bd356bf5d2b0e1f2882ed863de Mon Sep 17 00:00:00 2001
From: David Given <dg@cowlark.com>
Date: Sat, 8 Oct 2016 23:32:13 +0200
Subject: [PATCH] Replace pmap_get() with pmap_findleft() and pmap_findright(),
 to allow lookups in both directions.

---
 modules/src/data/pmap.c | 17 ++++++++++++++++-
 modules/src/data/pmap.h |  3 ++-
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/modules/src/data/pmap.c b/modules/src/data/pmap.c
index 9ed2d9fed..ae62af3c6 100644
--- a/modules/src/data/pmap.c
+++ b/modules/src/data/pmap.c
@@ -56,7 +56,7 @@ void pmap_add(void* mapp, void* left, void* right)
     append(map, left, right);
 }
 
-void* pmap_get(void* mapp, void* left)
+void* pmap_findleft(void* mapp, void* left)
 {
     struct pmap* map = mapp;
     int i;
@@ -71,4 +71,19 @@ void* pmap_get(void* mapp, void* left)
 	return NULL;
 }
 
+void* pmap_findright(void* mapp, void* right)
+{
+    struct pmap* map = mapp;
+    int i;
+
+    for (i=0; i<map->count; i++)
+    {
+        struct pmap_node* node = &map->item[i];
+		if (node->right == right)
+			return node->left;
+    }
+
+	return NULL;
+}
+
 
diff --git a/modules/src/data/pmap.h b/modules/src/data/pmap.h
index 19986fc12..8c06ec605 100644
--- a/modules/src/data/pmap.h
+++ b/modules/src/data/pmap.h
@@ -25,7 +25,8 @@ struct pmap
 
 extern void pmap_put(void* map, void* left, void* right);
 extern void pmap_add(void* map, void* left, void* right);
-extern void* pmap_get(void* map, void* left);
+extern void* pmap_findleft(void* map, void* left);
+extern void* pmap_findright(void* map, void* right);
 
 #endif