From 2ae890547ab92eefa31307b48676917b5fb15871 Mon Sep 17 00:00:00 2001
From: Magnus Lundborg <lundborg.magnus@gmail.com>
Date: Fri, 25 Oct 2013 10:25:42 +0200
Subject: Check that writing frequency is OK before setting it.

In the high-level API return TNG_FAILURE if the specified
writing frequency is <= 0. Also give an error message.

In the low-level API this is silently fixed by setting it
to at least 1.

Fixes #1366.

diff --git a/src/lib/tng_io.c b/src/lib/tng_io.c
index a8f9a02..74a5228 100644
--- a/src/lib/tng_io.c
+++ b/src/lib/tng_io.c
@@ -14964,6 +14964,13 @@ tng_function_status DECLSPECDLLEXPORT tng_util_generic_write_frequency_set
         return(stat);
     }
 
+    if(f <= 0)
+    {
+        printf("Cannot set writing frequency to %"PRId64". %s: %d\n",
+               f, __FILE__, __LINE__);
+        return(TNG_FAILURE);
+    }
+
     frame_set = &tng_data->current_trajectory_frame_set;
 
     if(!frame_set || tng_data->n_trajectory_frame_sets <= 0)
-- 
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