src/rrd_daemon.c: Catch invalid uses of `flush'.

And don't run into an assertion in that case.

diff --git a/src/rrd_daemon.c b/src/rrd_daemon.c
index 024738b..1f961db 100644 (file)
--- a/src/rrd_daemon.c
+++ b/src/rrd_daemon.c
@@ -516,6 +516,9 @@ static int buffer_get_field (char **buffer_ret, /* {{{ */
   field = *buffer_ret;
   field_size = 0;
 
+  if (buffer_size <= 0)
+    return (-1);
+
   /* This is ensured by `handle_request'. */
   assert (buffer[buffer_size - 1] == ' ');
 
@@ -668,19 +671,20 @@ static int handle_request_flush (int fd, /* {{{ */
   status = buffer_get_field (&buffer, &buffer_size, &file);
   if (status != 0)
   {
-    RRDD_LOG (LOG_INFO, "handle_request_flush: Cannot get file name.");
-    return (-1);
+    strncpy (result, "-1 Usage: flush <filename>\n", sizeof (result));
   }
-
-  status = flush_file (file);
-  if (status == 0)
-    snprintf (result, sizeof (result), "0 Successfully flushed %s.\n", file);
-  else if (status == ENOENT)
-    snprintf (result, sizeof (result), "-1 No such file: %s.\n", file);
-  else if (status < 0)
-    strncpy (result, "-1 Internal error.\n", sizeof (result));
   else
-    snprintf (result, sizeof (result), "-1 Failed with status %i.\n", status);
+  {
+    status = flush_file (file);
+    if (status == 0)
+      snprintf (result, sizeof (result), "0 Successfully flushed %s.\n", file);
+    else if (status == ENOENT)
+      snprintf (result, sizeof (result), "-1 No such file: %s.\n", file);
+    else if (status < 0)
+      strncpy (result, "-1 Internal error.\n", sizeof (result));
+    else
+      snprintf (result, sizeof (result), "-1 Failed with status %i.\n", status);
+  }
   result[sizeof (result) - 1] = 0;
 
   status = write (fd, result, strlen (result));