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From: sansom@trwrb.UUCP (Richard Sansom)
Newsgroups: comp.sys.atari.st
Subject: VT52 Macros
Message-ID: <1777@trwrb.UUCP>
Date: Thu, 16-Apr-87 22:59:14 EST
Article-I.D.: trwrb.1777
Posted: Thu Apr 16 22:59:14 1987
Date-Received: Sun, 19-Apr-87 11:08:10 EST
Reply-To: sansom@trwrb.UUCP (Richard Sansom)
Organization: TRW EDS, Redondo Beach, CA
Lines: 129

I received a few requests for these macro definitions, so I decided to 
post them.  They're pretty easy to figure out, and not too terribly clever,
but they do work (I _think_ I've used them all at one time or another).

Enjoy.

-Rich

p.s. - I've _never_ used these in combination with GEM stuff, so I can't
tell you what to expect if that's what you intend to do with'em.

--- cut here, extract file vt52.h ---
/*
 * vt52.h -- Atari ST VT52 "glass terminal" macros.
 *
 * Richard E. Sansom	April 16, 1987
 * sansom@trwrb.UUCP
 *
 * These macros are fairly easy to understand (in my opinion).  Simply
 * invoke them in your C source code, and they do what their names imply.
 *
 * For example, to clear the screen and turn inverse on, you would use:
 *
 *    Clear_Home();
 *    Inverse_On();
 *
 * The only "tricky" ones are the ones dealing with color, since the ST
 * can operate in 3 different resolution/color combinations.  If you have a
 * mono system, needless to say, you have no colors to work with (just B & W).
 * If you like the low rez color screen, you have 16 colors to work with.
 * As for me, I pretty much limit myself to the medium rez when I'm dealing
 * with text on my color monitor, hence the 4 #defines you see below.
 *
 */

/* define the real workhorse routines */

extern long bios();
extern long gemdos();

/*
 * These four macros manipulate the cursor as you might
 * expect - they move it 1 character in the indicated direction.
 */
#define Cursor_Up()	    gemdos(9,"\033A");
#define Cursor_Dn()	    gemdos(9,"\033B");
#define Cursor_Rt()	    gemdos(9,"\033C");
#define Cursor_Lf()	    gemdos(9,"\033D");

/*
 * These move the cursor to the "home" position.
 * The first one also clears the screen in the process.
 */
#define Clear_Home()	    gemdos(9,"\033E");
#define Cursor_Home()	    gemdos(9,"\033H");

/*
 * These are pretty much self-explanatory.  Scroll_Up()
 * scrolls the entire screen up by one line, Clear_Eod()
 * clears the screen from the current cursor position
 * to the end of the display, and Clear_Eol() clears the
 * current line from the cursor position.
 */
#define Scroll_Up()	    gemdos(9,"\033I");
#define Clear_Eod()	    gemdos(9,"\033J");
#define Clear_Eol()	    gemdos(9,"\033K");

/*
 * These are pretty obvious.
 */
#define Insert_Line()	    gemdos(9,"\033L");
#define Delete_Line()	    gemdos(9,"\033M");

/*
 * This is a handy one - it positions the cursor
 * to the x, y position you specify.
 */
#define Pos_Cursor(x,y)	gemdos(9,"\033Y"); bios(3,2,32+y); bios(3,2,32+x)

/*
 * The color stuff - obviously, I do most of my color text in
 * medium rez.  Fg_Color() sets the foreground color (the color
 * of the text), and Bg_Color() sets the background color (the
 * color of the screen surrounding the text).  You can get some
 * pretty spiffy looking displays by playing with these guys.
 */

#define WHITE		    0
#define RED		    1
#define GREEN		    2
#define BLACK		    3

#define Fg_Color(x)	    gemdos(9, "\033b"); bios(3,2,x)
#define Bg_Color(x)	    gemdos(9, "\033c"); bios(3,2,x)

/*
 * Some of these are a bit more obscure, but are also probably
 * not used too much.  Clear_Bod() clears the screen from the
 * current cursor position to the beginning of the display,
 * Save_Cursor() saves the current x, y coordinates of the
 * cursor, and Restore_Cursor() restores the x, y coordinates
 * to their saved values.
 */
#define Clear_Bod()	    gemdos(9, "\033d")
#define Show_Cursor()	    gemdos(9, "\033e")
#define Hide_Cursor()	    gemdos(9, "\033f")
#define Save_Cursor()	    gemdos(9, "\033j")
#define Restore_Cursor()    gemdos(9, "\033k")
#define Clear_Line()	    gemdos(9, "\033l")
#define Clear_Bol()	    gemdos(9, "\033o")

/*
 * These two begin and end inverse video mode.
 */
#define Inverse_On()	    gemdos(9, "\033p")
#define Inverse_Off()	    gemdos(9, "\033q")

/*
 * Finally, these two toggle line wrap.
 */
#define Wrap_On()	    gemdos(9, "\033v")
#define Wrap_Off()	    gemdos(9, "\033w")

--- cut here ---
-- 
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  /// Richard E. Sansom                   TRW Electronics & Defense Sector \\\
  \\\ {decvax,ucbvax,ihnp4}!trwrb!sansom  Redondo Beach, CA                ///
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