Re: screen discards undefined escape sequences

Dan Nelson <[email protected]> writes:

> In the last episode (Jan 06), Mark Plaksin said:
>> screen discards certain escape sequences.  For example if you run this:
>> echo ^[Hello        # where ^[ is an actual escape character
>> 
>> you get this:
>> ello

...

>> Emacs' term-mode looks for an escape sequence (^[AnSiT) to do directory
>> tracking.  This fails inside of screen because screen discards the ^[A.
>
> ESC A doesn't appear in my table.  I don't actually have a copy of
> X3.64, though, so I can't say for sure whether unknown escapes are
> supposed to be eaten or passed through.  Can you tell Emacs to send
> something else?

Emacs can be made to look for something else, sure.  But let me
rephrase my question:

What is the right way to get screen to print ESC A to the screen?  I
have tried adding the following to DoESC in ansi.c but instead of an
escape character I get a colored non-ASCII character and then an A.  I
also have the dungeon collapse around me after running screen a while.

          struct mchar happymchar;
          happymchar.image = '\033';
          happymchar.attr = NATTR;
          happymchar.font = 0;
          happymchar.color = 9;
          MPutChar(curr, &happymchar, curr->w_x, curr->w_y);
          LPutChar(&curr->w_layer, &happymchar, curr->w_x, curr->w_y);
          curr->w_x++;
          happymchar.image = c;
          MPutChar(curr, &curr->w_rend, curr->w_x, curr->w_y);
          LPutChar(&curr->w_layer, &curr->w_rend, curr->w_x, curr->w_y);
          curr->w_x++;

What am I missing?


 

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