open.c (test_endfile): Revert changes for 31052, restoring this function.

2007-04-14  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

	* io/open.c (test_endfile): Revert changes for 31052, restoring this
	function.

From-SVN: r123842

1 files changed, 23 insertions, 0 deletions

diff --git a/libgfortran/io/open.c b/libgfortran/io/open.c
index 742610a..55c3769 100644
--- a/libgfortran/io/open.c
+++ b/libgfortran/io/open.c
@@ -109,6 +109,20 @@ static const st_option convert_opt[] =
   { NULL, 0}
 };
 
+
+/* Given a unit, test to see if the file is positioned at the terminal
+   point, and if so, change state from NO_ENDFILE flag to AT_ENDFILE.
+   This prevents us from changing the state from AFTER_ENDFILE to
+   AT_ENDFILE.  */
+
+static void
+test_endfile (gfc_unit * u)
+{
+  if (u->endfile == NO_ENDFILE && file_length (u->s) == file_position (u->s))
+    u->endfile = AT_ENDFILE;
+}
+
+
 /* Change the modes of a file, those that are allowed * to be
    changed.  */
 
@@ -195,6 +209,8 @@ edit_modes (st_parameter_open *opp, gfc_unit * u, unit_flags * flags)
 
       u->current_record = 0;
       u->last_record = 0;
+
+      test_endfile (u);
       break;
 
     case POSITION_APPEND:
@@ -472,6 +488,13 @@ new_unit (st_parameter_open *opp, gfc_unit *u, unit_flags * flags)
   memmove (u->file, opp->file, opp->file_len);
   u->file_len = opp->file_len;
 
+  /* Curiously, the standard requires that the
+     position specifier be ignored for new files so a newly connected
+     file starts out at the initial point.  We still need to figure
+     out if the file is at the end or not.  */
+
+  test_endfile (u);
+
   if (flags->status == STATUS_SCRATCH && opp->file != NULL)
     free_mem (opp->file);
   return u;