re PR fortran/47778 (reading two arrays of structures from namelist fails)

2011-02-27  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

	PR libgfortran/47778
	* io/list_read.c (namelist_read): Intialize the error string buffere.
	If pprev_nl was used during the previous namelist read and the rank
	was zero, reset the pointer to NULL for the next namelist read.

From-SVN: r170548

libgfortran/ChangeLog

+2011-02-27  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
+
+	PR libgfortran/47778
+	* io/list_read.c (namelist_read): Intialize the error string buffere.
+	If pprev_nl was used during the previous namelist read and the rank
+	was zero, reset the pointer to NULL for the next namelist read.
+
 2011-02-26  Francois-Xavier Coudert  <fxcoudert@gcc.gnu.org>
 
 	PR libfortran/45165

libgfortran/io/list_read.c

@@ -2985,6 +2985,11 @@ namelist_read (st_parameter_dt *dtp)
 {
   int c;
   char nml_err_msg[200];
+
+  /* Initialize the error string buffer just in case we get an unexpected fail
+     somewhere and end up at nml_err_ret.  */
+  strcpy (nml_err_msg, "Internal namelist read error");
+
   /* Pointer to the previously read object, in case attempt is made to read
      new object name.  Should this fail, error message can give previous
      name.  */
@@ -3058,6 +3063,11 @@ find_nml_name:
 	    goto nml_err_ret;
 	  generate_error (&dtp->common, LIBERROR_READ_VALUE, nml_err_msg);
         }
+
+      /* Reset the previous namelist pointer if we know we are not going
+	 to be doing multiple reads within a single namelist object.  */
+      if (prev_nl && prev_nl->var_rank == 0)
+	prev_nl = NULL;
     }
 
   free_saved (dtp);