--- a/src/ls-hdf5.h
+++ b/src/ls-hdf5.h
@@ -50,17 +50,17 @@
   hdf5_fstreambase (const char *name, int mode, int /* prot */ = 0)
     {
       if (mode & std::ios::in)
-	file_id = H5Fopen (name, H5F_ACC_RDONLY, H5P_DEFAULT);
+        file_id = H5Fopen (name, H5F_ACC_RDONLY, H5P_DEFAULT);
       else if (mode & std::ios::out)
-	{
-	  if (mode & std::ios::app && H5Fis_hdf5 (name) > 0)
-	    file_id = H5Fopen (name, H5F_ACC_RDWR, H5P_DEFAULT);
-	  else
-	    file_id = H5Fcreate (name, H5F_ACC_TRUNC, H5P_DEFAULT, 
-				 H5P_DEFAULT);
-	}
+        {
+          if (mode & std::ios::app && H5Fis_hdf5 (name) > 0)
+            file_id = H5Fopen (name, H5F_ACC_RDWR, H5P_DEFAULT);
+          else
+            file_id = H5Fcreate (name, H5F_ACC_TRUNC, H5P_DEFAULT, 
+                                 H5P_DEFAULT);
+        }
       if (file_id < 0)
-	std::ios::setstate (std::ios::badbit);
+        std::ios::setstate (std::ios::badbit);
 
       current_item = 0;
     }
@@ -68,11 +68,11 @@
   void close ()
     { 
       if (file_id >= 0)
-	{
-	  if (H5Fclose (file_id) < 0)
-	    std::ios::setstate (std::ios::badbit);
-	  file_id = -1;
-	}
+        {
+          if (H5Fclose (file_id) < 0)
+            std::ios::setstate (std::ios::badbit);
+          file_id = -1;
+        }
     }
 
   void open (const char *name, int mode, int)
@@ -80,17 +80,17 @@
       clear ();
 
       if (mode & std::ios::in)
-	file_id = H5Fopen (name, H5F_ACC_RDONLY, H5P_DEFAULT);
+        file_id = H5Fopen (name, H5F_ACC_RDONLY, H5P_DEFAULT);
       else if (mode & std::ios::out)
-	{
-	  if (mode & std::ios::app && H5Fis_hdf5 (name) > 0)
-	    file_id = H5Fopen (name, H5F_ACC_RDWR, H5P_DEFAULT);
-	  else
-	    file_id = H5Fcreate (name, H5F_ACC_TRUNC, H5P_DEFAULT, 
-				 H5P_DEFAULT);
-	}
+        {
+          if (mode & std::ios::app && H5Fis_hdf5 (name) > 0)
+            file_id = H5Fopen (name, H5F_ACC_RDWR, H5P_DEFAULT);
+          else
+            file_id = H5Fcreate (name, H5F_ACC_TRUNC, H5P_DEFAULT, 
+                                 H5P_DEFAULT);
+        }
       if (file_id < 0)
-	std::ios::setstate (std::ios::badbit);
+        std::ios::setstate (std::ios::badbit);
 
       current_item = 0;
     }
@@ -106,11 +106,11 @@
   hdf5_ifstream () : hdf5_fstreambase (), std::istream (0) { }
 
   hdf5_ifstream (const char *name, int mode = std::ios::in|std::ios::binary,
-		 int prot = 0)
+                 int prot = 0)
     : hdf5_fstreambase (name, mode, prot), std::istream (0) { }
 
   void open (const char *name, int mode = std::ios::in|std::ios::binary,
-	     int prot = 0)
+             int prot = 0)
     { hdf5_fstreambase::open (name, mode, prot); }
 };
 
@@ -121,11 +121,11 @@
   hdf5_ofstream () : hdf5_fstreambase (), std::ostream (0) { }
 
   hdf5_ofstream (const char *name, int mode = std::ios::out|std::ios::binary,
-		 int prot = 0)
+                 int prot = 0)
     : hdf5_fstreambase (name, mode, prot), std::ostream (0) { }
 
   void open (const char *name, int mode = std::ios::out|std::ios::binary,
-	     int prot = 0)
+             int prot = 0)
     { hdf5_fstreambase::open (name, mode, prot); }
 };
 
@@ -168,8 +168,8 @@
 
 extern OCTINTERP_API bool
 add_hdf5_data (hid_t loc_id, const octave_value& tc,
-	       const std::string& name, const std::string& doc,
-	       bool mark_as_global, bool save_as_floats);
+               const std::string& name, const std::string& doc,
+               bool mark_as_global, bool save_as_floats);
 
 extern OCTINTERP_API int
 save_hdf5_empty (hid_t loc_id, const char *name, const dim_vector d);
@@ -179,12 +179,12 @@
 
 extern OCTINTERP_API std::string
 read_hdf5_data (std::istream& is,  const std::string& filename, bool& global,
-		octave_value& tc, std::string& doc);
+                octave_value& tc, std::string& doc);
 
 extern OCTINTERP_API bool
 save_hdf5_data (std::ostream& os, const octave_value& tc,
-		const std::string& name, const std::string& doc,
-		bool mark_as_global, bool save_as_floats);
+                const std::string& name, const std::string& doc,
+                bool mark_as_global, bool save_as_floats);
 
 #ifdef IDX_TYPE_LONG
 #define H5T_NATIVE_IDX H5T_NATIVE_LONG