re PR libfortran/26499 (gfortran - End of File incorrectly positioned after binary I/O.)

2006-03-09  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

	PR libgfortran/26499
	* io/file_pos (st_rewind): Flush always.
	* io/unix.c (fd_truncate): Return SUCCESS rather than FAILURE for
	special files like /dev/null.
	* io/transfer.c (st_write_done): Remove broken logic that prevented
	calling fd_truncate.

From-SVN: r111924

libgfortran/ChangeLog

+2006-03-09  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
+
+	PR libgfortran/26499
+	* io/file_pos (st_rewind): Flush always.
+	* io/unix.c (fd_truncate): Return SUCCESS rather than FAILURE for
+	special files like /dev/null.
+	* io/transfer.c (st_write_done): Remove broken logic that prevented
+	calling fd_truncate.
+
 2006-03-05  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
 
 	PR libgfortran/26554

libgfortran/io/file_pos.c

@@ -246,15 +246,14 @@ st_rewind (st_parameter_filepos *fpp)
 			"Cannot REWIND a file opened for DIRECT access");
       else
 	{
-	  /* If we have been writing to the file, the last written record
-	     is the last record in the file, so truncate the file now.
-	     Reset to read mode so two consecutive rewind statements do not
-	     delete the file contents.  Flush buffer when switching mode.  */
-          if (u->mode == WRITING)
-	    {
-	      flush (u->s);
-	      struncate (u->s);
-	    }
+	  /* Flush the buffers.  If we have been writing to the file, the last
+	       written record is the last record in the file, so truncate the
+	       file now.  Reset to read mode so two consecutive rewind
+	       statements do not delete the file contents.  */
+	  flush (u->s);
+	  if (u->mode == WRITING)
+	    struncate (u->s);
+
 	  u->mode = READING;
 	  u->last_record = 0;
 	  if (sseek (u->s, 0) == FAILURE)

libgfortran/io/transfer.c

@@ -2189,7 +2189,8 @@ st_write_done (st_parameter_dt *dtp)
 
   /* Deal with endfile conditions associated with sequential files.  */
 
-  if (dtp->u.p.current_unit != NULL && dtp->u.p.current_unit->flags.access == ACCESS_SEQUENTIAL)
+  if (dtp->u.p.current_unit != NULL 
+      && dtp->u.p.current_unit->flags.access == ACCESS_SEQUENTIAL)
     switch (dtp->u.p.current_unit->endfile)
       {
       case AT_ENDFILE:		/* Remain at the endfile record.  */
@@ -2200,12 +2201,10 @@ st_write_done (st_parameter_dt *dtp)
 	break;
 
       case NO_ENDFILE:
-	if (dtp->u.p.current_unit->current_record > dtp->u.p.current_unit->last_record)
-	  {
-	    /* Get rid of whatever is after this record.  */
-	    if (struncate (dtp->u.p.current_unit->s) == FAILURE)
-	      generate_error (&dtp->common, ERROR_OS, NULL);
-	  }
+	/* Get rid of whatever is after this record.  */
+	flush (dtp->u.p.current_unit->s);
+	if (struncate (dtp->u.p.current_unit->s) == FAILURE)
+	  generate_error (&dtp->common, ERROR_OS, NULL);
 
 	dtp->u.p.current_unit->endfile = AT_ENDFILE;
 	break;

libgfortran/io/unix.c

@@ -586,7 +586,7 @@ fd_truncate (unix_stream * s)
 
   /* non-seekable files, like terminals and fifo's fail the lseek.
      Using ftruncate on a seekable special file (like /dev/null)
-     is undefined, so we treat it as if the ftruncate failed.
+     is undefined, so we treat it as if the ftruncate succeeded.
   */
 #ifdef HAVE_FTRUNCATE
   if (s->special_file || ftruncate (s->fd, s->logical_offset))
@@ -597,7 +597,7 @@ fd_truncate (unix_stream * s)
 #endif
     {
       s->physical_offset = s->file_length = 0;
-      return FAILURE;
+      return SUCCESS;
     }
 
   s->physical_offset = s->file_length = s->logical_offset;