From f4cecda288dbc2b469d908af4f6d71c7a7c018a3 Mon Sep 17 00:00:00 2001
From: Magnus Lundborg <lundborg.magnus@gmail.com>
Date: Mon, 30 Jun 2014 10:01:13 +0200
Subject: Fixed tng_num_frame_sets_get()

tng_num_frame_sets_get() should not fail if there are no frame sets.

Change-Id: Ie01a6b3230af7413a51ba144bd03c5fe00c25519

diff --git a/BuildTNG.cmake b/BuildTNG.cmake
index f4f2caf..77dd1d2 100644
--- a/BuildTNG.cmake
+++ b/BuildTNG.cmake
@@ -5,7 +5,7 @@ set(TNG_ROOT_BINARY_DIR ${CMAKE_BINARY_DIR}/${TNG_ROOT_BINARY_DIR})
 function (TNG_GENERATE_VERSION_H)
     set(TNG_MAJOR_VERSION "1")
     set(TNG_MINOR_VERSION "6")
-    set(TNG_VERSION_PATCH_LEVEL "0")
+    set(TNG_VERSION_PATCH_LEVEL "1")
     set(TNG_IO_VERSION "${TNG_MAJOR_VERSION}.${TNG_MINOR_VERSION}.${TNG_VERSION_PATCH_LEVEL}")
     set(TNG_API_VERSION "6")
     configure_file(${TNG_ROOT_SOURCE_DIR}/include/tng/version.h.in
diff --git a/src/lib/tng_io.c b/src/lib/tng_io.c
index 792be2e..fa4d3e5 100644
--- a/src/lib/tng_io.c
+++ b/src/lib/tng_io.c
@@ -11525,7 +11525,7 @@ tng_function_status DECLSPECDLLEXPORT tng_num_frame_sets_get
     int64_t long_stride_length, medium_stride_length;
     long file_pos, orig_frame_set_file_pos;
     tng_trajectory_frame_set_t frame_set;
-    struct tng_trajectory_frame_set   orig_frame_set;
+    struct tng_trajectory_frame_set orig_frame_set;
     tng_gen_block_t block;
     tng_function_status stat;
     int64_t cnt = 0;
@@ -11540,6 +11540,12 @@ tng_function_status DECLSPECDLLEXPORT tng_num_frame_sets_get
     orig_frame_set_file_pos = tng_data->current_trajectory_frame_set_input_file_pos;
     file_pos = (long)tng_data->first_trajectory_frame_set_input_file_pos;
 
+    if(file_pos < 0)
+    {
+        *n = tng_data->n_trajectory_frame_sets = cnt;
+        return(TNG_SUCCESS);
+    }
+
     tng_block_init(&block);
     fseek(tng_data->input_file,
           file_pos,
@@ -16903,7 +16909,12 @@ tng_function_status DECLSPECDLLEXPORT tng_util_trajectory_open
         /* Read the file headers */
         tng_file_headers_read(*tng_data_p, TNG_USE_HASH);
 
-        tng_num_frame_sets_get(*tng_data_p, &(*tng_data_p)->n_trajectory_frame_sets);
+        stat = tng_num_frame_sets_get(*tng_data_p, &(*tng_data_p)->n_trajectory_frame_sets);
+
+        if(stat != TNG_SUCCESS)
+        {
+            return(stat);
+        }
     }
 
     if(mode == 'w')
-- 
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