From b68e14dd66d4cd7e2840a4218922dce6498ed8b0 Mon Sep 17 00:00:00 2001
From: c9s <yoanlin93@gmail.com>
Date: Tue, 3 Jun 2014 18:37:36 +0800
Subject: [PATCH] r3_tree_render_dot(const node * tree, FILE *fp); support

---
 include/r3_gvc.h  | 3 ++-
 src/gvc.c         | 4 ++--
 tests/check_gvc.c | 2 +-
 3 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/include/r3_gvc.h b/include/r3_gvc.h
index 1fe1f7d..1cd0765 100644
--- a/include/r3_gvc.h
+++ b/include/r3_gvc.h
@@ -7,11 +7,12 @@
 #ifndef R3_GVC_H
 #define R3_GVC_H
 
+#include <stdio.h>
 #include <gvc.h>
 
 void r3_tree_build_ag_nodes(Agraph_t * g, Agnode_t * ag_parent_node, const node * n, int node_cnt);
 
-int r3_tree_render_dot(const node * tree);
+int r3_tree_render_dot(const node * tree, FILE *fp);
 
 int r3_tree_render_file(const node * tree, const char * format, const char * filename);
 
diff --git a/src/gvc.c b/src/gvc.c
index b4669fe..6975fef 100644
--- a/src/gvc.c
+++ b/src/gvc.c
@@ -45,7 +45,7 @@ void r3_tree_build_ag_nodes(Agraph_t * g, Agnode_t * ag_parent_node, const node
 /**
  * Render a tree to tree graph image via graphviz (dot)
  */
-int r3_tree_render_dot(const node * tree)
+int r3_tree_render_dot(const node * tree, FILE *fp)
 {
     Agraph_t *g;
     /* set up a graphviz context - but only once even for multiple graphs */
@@ -61,7 +61,7 @@ int r3_tree_render_dot(const node * tree)
     Agnode_t *ag_root = agnode(g, "{root}", 1);
     r3_tree_build_ag_nodes(g, ag_root, tree, 0);
     gvLayout(gvc, g, "dot");
-    gvRender(gvc, g, "dot", stdout);
+    gvRender(gvc, g, "dot", fp);
     gvFreeLayout(gvc, g);
     agclose(g);
     return 0;
diff --git a/tests/check_gvc.c b/tests/check_gvc.c
index f622e98..7f3371b 100644
--- a/tests/check_gvc.c
+++ b/tests/check_gvc.c
@@ -27,7 +27,7 @@ START_TEST (test_gvc_render_dot)
 
     r3_tree_compile(n, NULL);
 
-    r3_tree_render_dot(n);
+    r3_tree_render_dot(n, stderr);
 
     r3_tree_free(n);
 }