From b1deabf87933e51ec589619aefcfb4ab34aeea32 Mon Sep 17 00:00:00 2001
From: oetiker <oetiker@a5681a0c-68f1-0310-ab6d-d61299d08faa>
Date: Mon, 6 Apr 2009 14:08:16 +0000
Subject: [PATCH] lets have an error message when creating the graph fails

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk/program@1768 a5681a0c-68f1-0310-ab6d-d61299d08faa
---
 src/rrd_graph.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/rrd_graph.c b/src/rrd_graph.c
index eb90952..549e08c 100644
--- a/src/rrd_graph.c
+++ b/src/rrd_graph.c
@@ -3844,8 +3844,11 @@ int rrd_graph(
             (*prdata)[prlines] = NULL;
             strcpy((*prdata)[prlines - 1], walker->value.u_str);
         } else if (strcmp(walker->key, "image") == 0) {
-            fwrite(walker->value.u_blo.ptr, walker->value.u_blo.size, 1,
-                   (stream ? stream : stdout));
+            if ( fwrite(walker->value.u_blo.ptr, walker->value.u_blo.size, 1,
+                   (stream ? stream : stdout)) == 0 && ferror(stream ? stream : stdout)){
+                rrd_set_error("writing image");
+                return 0;
+            }
         }
         /* skip anything else */
         walker = walker->next;
-- 
2.11.0