[svn-r1306] Changes since 19990602

----------------------

./doc/html/Datatypes.html
./test/dtypes.c
	Added documentation and tests for opaque types.

./tools/h5ls.c
	Added a `-x' or `--hexdump' argument which is not fully
	implemented (because I want to synchronize h5tools.c first)
	but which will eventually print raw data in hexadecimal format
	without any translation from disk. This would be useful for
	debugging references and VL types.

./tools/h5tools.c
	Added support for references (not quite finished yet, but
	compiles -- I wanted to sync up this file before Patrick and I
	got too far apart...)


./src/H5R.c
	Checked for error return value from H5R_get_object_type()

./src/H5A.c
./src/H5D.c
	Changed error return values from NULL to FAIL

./test/Makefile.in
./test/trefer.c
	Creates trefer1.h5 and trefer2.h5 so that the second test
	doesn't clobber the first file since the files might be useful
	for debugging.

1 files changed, 5 insertions, 2 deletions

diff --git a/src/H5R.c b/src/H5R.c
index 274b69f..6535ebf 100644
--- a/src/H5R.c
+++ b/src/H5R.c
@@ -733,8 +733,11 @@ H5Rget_object_type(hid_t dataset, void *_ref)
 		     "invalid reference pointer");
 
     /* Get the object information */
-    ret_value=H5R_get_object_type(dset,_ref);
-
+    if ((ret_value=H5R_get_object_type(dset,_ref))<0) {
+	HGOTO_ERROR(H5E_REFERENCE, H5E_CANTINIT, H5G_UNKNOWN,
+		    "unable to determine object type");
+    }
+    
 done:
     FUNC_LEAVE(ret_value);
 }   /* end H5Rget_object_type() */