Re: [LINUX5250] Cursor positioning

[Scott Klement <klemscot@xxxxxxxxxxxx>]

On Thu, 6 Feb 2003 MarkB@cms400.com wrote:
>
> One issue that comes up with this fix, is that in general the most you have
> to type home to invoke it as an AID key should be twice.
> 1. -->to the home position if it's not already there.
> 2. -->AID key.
> Somehow, with this fix, you have to end up pressing it 3 times. This might
> be because the check to see if Home should be processed as an aid key is
> done at the end of tn5250_display_kf_home.
>

This issue does not appear to be your patch's fault :)   If you run a
trace file, and watch it with tail -f, you'll see that on the 2nd press
of the HOME key, tn5250 does in fact send an AID record.

The AS/400 sends back a screen that has an IC order that goes to x'01',
x'08' (the start of the COMMAND line in SEU).   However, TN5250 is
not positioning the cursor to this position.   The reason for this appears
to be that x_system is off...  it only wants to move the cursor to the IC
when the keyboard transitions from x_system to unlocked.

I believe that this is incorrect behavior.   There's a comment in the 5494
functions reference manual about bit 1 of the 2nd control byte which I
believe was taken out of context.   This bit was not even being checked :)

I have a fix that may be correct.   I say "may be" because I'm not quite
sure what else it breaks :)   I also wonder what is supposed to happen
for a 2nd WTD command...  I know that if an IC or MC order is sent, we are
to use it.   But, what if no IC or MC is sent?  Do we use the one from the
last WTD, or do we reset back to 0,0?

That's the one thing that I can figure would be affected by not resetting
pending_insert to 0.   If the new format has no IC order, the
pending_insert=1 may still be around from the last WTD, causing the cursor
to get reset to that same position (again).   But, maybe it shouldn't?
I'll take a look at that when I get a chance.

Please try this patch.   I think it's correct...  if not, please let me
know...


Index: display.c
===================================================================
RCS file: /cvsroot/tn5250/tn5250/src/display.c,v
retrieving revision 1.49
diff -u -r1.49 display.c
--- display.c   4 Nov 2002 08:55:56 -0000       1.49
+++ display.c   7 Feb 2003 00:52:00 -0000
@@ -541,7 +541,7 @@
 {
   if (This->pending_insert) {
       tn5250_dbuffer_goto_ic(This->display_buffers);
-      This->pending_insert = 0;
+ /*     This->pending_insert = 0; */
   } else {
       int y = 0, x = 0;
       Tn5250Field *iter = This->display_buffers->field_list;
Index: session.c
===================================================================
RCS file: /cvsroot/tn5250/tn5250/src/session.c,v
retrieving revision 1.59
diff -u -r1.59 session.c
--- session.c   4 Nov 2002 08:55:56 -0000       1.59
+++ session.c   7 Feb 2003 00:52:00 -0000
@@ -850,9 +850,10 @@
    is_x_system = (This->display->keystate != TN5250_KEYSTATE_UNLOCKED);
    will_be_unlocked = ((CC2 & TN5250_SESSION_CTL_UNLOCK) != 0);
    cur_opcode = tn5250_record_opcode(This->record);
-   if (end_y != 0xff && end_x != 0xff)
+   if (end_y != 0xff && end_x != 0xff && !(CC2 &
TN5250_SESSION_CTL_IC_ULOCK)) {
       tn5250_display_set_cursor(This->display, end_y, end_x);
-   else if((is_x_system && will_be_unlocked) ||
+   }
+   else if((will_be_unlocked && !(CC2 & TN5250_SESSION_CTL_IC_ULOCK)) ||
         cur_opcode == TN5250_RECORD_OPCODE_RESTORE_SCR) {
       tn5250_display_set_cursor_home (This->display);
    } else {