re PR libfortran/20950 ([4.0 only] segfault in INQUIRE asking for SEQUENTIAL status)

	PR libfortran/20950
	* io/inquire.c (inquire_via_unit): Check for the gfc_unit being
	NULL when setting ioparm.sequential.
	* gfortran.dg/pr20950.f: New test.

From-SVN: r98312

gcc/testsuite/ChangeLog

+2005-04-11  Francois-Xavier Coudert  <coudert@clipper.ens.fr>
+
+	PR libfortran/20950
+	* gfortran.dg/pr20950.f: New test.
+
 2005-04-18  Francois-Xavier Coudert  <coudert@clipper.ens.fr>
 
 	PR libfortran/19216

gcc/testsuite/gfortran.dg/pr20950.f

+! PR libfortran/20950
+! Original bug-report by Walt Brainerd, The Fortran Company
+! { dg-do run }
+      character*20 c
+      inquire (33, sequential = c)
+      if (c .ne. "UNKNOWN") call abort
+      end

libgfortran/ChangeLog

+2005-04-11  Francois-Xavier Coudert  <coudert@clipper.ens.fr>
+
+	PR libfortran/20950
+	* io/inquire.c (inquire_via_unit): Check for the gfc_unit being
+	NULL when setting ioparm.sequential.
+
 2005-04-17  Thomas Koenig  <Thomas.Koenig@online.de>
 
 	PR libfortran/21075

libgfortran/io/inquire.c

@@ -87,13 +87,16 @@ inquire_via_unit (gfc_unit * u)
 
   if (ioparm.sequential != NULL)
     {
-      /* disallow an open direct access file to be accessed
-         sequentially */
-      if (u->flags.access==ACCESS_DIRECT)
-        p = "NO";
-      else   
-        p = (u == NULL) ? inquire_sequential (NULL, 0) :
-        inquire_sequential (u->file, u->file_len);
+      if (u == NULL)
+	p = inquire_sequential (NULL, 0);
+      else
+	{
+          /* disallow an open direct access file to be accessed sequentially */
+          if (u->flags.access == ACCESS_DIRECT)
+            p = "NO";
+          else   
+            p = inquire_sequential (u->file, u->file_len);
+	}
 
       cf_strcpy (ioparm.sequential, ioparm.sequential_len, p);
     }