[patch, libgfortran] Bug 78123 - Short reads with T edit descriptor not padding correctly

[Jerry DeLisle]

See patch below which is very simple. We were handling the case where we tabbed 
left of current position in the record by clearing the seen_eor flag. We were 
not handling the case where we tab toward the right and so are still at eor.

New test case attached. Regression tested on x86-64-linux.

OK to commit?

This is a regression relative to g77. Its simple enough I think it should go to 
5 and 6 as well.

Regards,

Jerry

2016-10-30  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

	PR fortran/79123
	* io/transfer.c (formatted_transfer_scalar_read): Clear seen_eor
	only if we have tabbed to left of current position.


diff --git a/libgfortran/io/transfer.c b/libgfortran/io/transfer.c
index b8eb5ed..5830362 100644
--- a/libgfortran/io/transfer.c
+++ b/libgfortran/io/transfer.c
@@ -1579,7 +1579,8 @@ formatted_transfer_scalar_read (st_parameter_dt *dtp, bt 
type, void *p, int kind
                dtp->u.p.current_unit->bytes_left -= dtp->u.p.sf_seen_eor;
                dtp->u.p.skips -= dtp->u.p.sf_seen_eor;
               bytes_used = pos;
-             dtp->u.p.sf_seen_eor = 0;
+             if (dtp->u.p.pending_spaces == 0)
+               dtp->u.p.sf_seen_eor = 0;
             }
           if (dtp->u.p.skips < 0)
             {
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