From 20f305f0c6577be1c95de373d0fe07998334234d Mon Sep 17 00:00:00 2001
From: Magnus Lundborg <magnus.lundborg@scilifelab.se>
Date: Mon, 28 Jan 2013 09:37:18 +0100
Subject: Update first trajectory frame set (if needed) when writing frame set

Conflicts:

	src/lib/tng_io.c

diff --git a/src/lib/tng_io.c b/src/lib/tng_io.c
index eeba683..e6f2956 100644
--- a/src/lib/tng_io.c
+++ b/src/lib/tng_io.c
@@ -7981,7 +7981,6 @@ tng_function_status tng_frame_set_write(tng_trajectory_t tng_data,
     &tng_data->current_trajectory_frame_set;
     
     tng_function_status stat;
-    
 
     tng_data->current_trajectory_frame_set_output_file_pos =
     tng_data->last_trajectory_frame_set_output_file_pos = 
@@ -7992,6 +7991,12 @@ tng_function_status tng_frame_set_write(tng_trajectory_t tng_data,
         return(TNG_FAILURE);
     }
 
+    if(tng_data->first_trajectory_frame_set_output_file_pos == -1)
+    {
+        tng_data->first_trajectory_frame_set_output_file_pos =
+        tng_data->current_trajectory_frame_set_output_file_pos;
+    }
+
     tng_block_init(&block);
 
     if(tng_frame_set_block_write(tng_data, block, hash_mode) != TNG_SUCCESS)
-- 
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