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{ operations for input/output of data from the terminal.
Randall Venhola 5-May-1987 }
[environment('screenhandlers')] MODULE screenhandlers;
TYPE
wordinteger = [WORD] 0..65535;
byterange = [BYTE] 0..255;
VAR
terminalerror : [HIDDEN,STATIC] integer := 0;
cursorrow : [HIDDEN,STATIC] wordinteger := 1;
cursorcolumn : [HIDDEN,STATIC] wordinteger := 1;
[GLOBAL] PROCEDURE clearsubscreen( line, column : integer );
FUNCTION LIB$ERASE_PAGE(lineno, colno : wordinteger) : integer; extern;
VAR
l, c : wordinteger;
BEGIN
l := line;
c := column;
terminalerror := lib$erase_page(l,c);
END;
[GLOBAL] PROCEDURE clearscreen;
BEGIN
clearsubscreen(1,1);
END;
[GLOBAL] PROCEDURE positioncursor( line, column : integer );
FUNCTION LIB$SET_CURSOR( lineno, colno : wordinteger ) : integer; extern;
VAR
l, c : wordinteger;
BEGIN
l := line;
c := column;
terminalerror := lib$set_cursor(l,c);
cursorrow := line;
cursorcolumn := column
END;
[GLOBAL] PROCEDURE rollttyforward;
BEGIN
positioncursor(cursorrow+1, cursorcolumn)
END;
[GLOBAL] PROCEDURE rollttyback;
BEGIN
if cursorrow > 1 then
positioncursor(cursorrow-1, cursorcolumn)
END;
[GLOBAL] PROCEDURE putstringtoterminal( string : VARYING [limit] of CHAR;
line, column : integer;
reversevideo : boolean;
blinking : boolean);
CONST
maxscreenwidth = 132;
VAR
l, c, flags, newcolumn : wordinteger;
FUNCTION LIB$PUT_SCREEN(outtext : VARYING [C] OF CHAR;
lineno : wordinteger; colno : wordinteger;
flags : wordinteger) : integer; extern;
BEGIN
l := line;
c := column;
if reversevideo then
if blinking then
flags := 3
else
flags := 2
else
flags := 0;
terminalerror := lib$put_screen(string, l, c, flags);
newcolumn := 1 + length(string) + cursorcolumn;
if newcolumn > maxscreenwidth then
positioncursor(cursorrow + 1, 1)
else
positioncursor( cursorrow, newcolumn)
END;
[GLOBAL] PROCEDURE ttywriteln;
const
carriagereturn = 13;
linefeed = 10;
var
endofline : [STATIC] VARYING[2] of char;
BEGIN
endofline.body[1] := chr(carriagereturn);
endofline.body[2] := chr(linefeed);
endofline.length := 2;
putstringtoterminal(endofline, cursorrow, cursorcolumn, false, false);
positioncursor(cursorrow + 1, 1)
END;
[GLOBAL] PROCEDURE ttyreadln( VAR string : VARYING [limit] of char );
FUNCTION LIB$GET_SCREEN(VAR inputtext : VARYING [lim1] OF CHAR;
promptstring : VARYING [lim2] OF CHAR; VAR outlen : wordinteger := %IMMED 0) : integer; extern;
VAR
len : wordinteger;
prompt : [STATIC] VARYING [2] OF CHAR := '>';
BEGIN
terminalerror := lib$get_screen(string, prompt, len);
ttywriteln
END;
[GLOBAL] PROCEDURE findcursor( var line, column : integer );
BEGIN
line := cursorrow;
column := cursorcolumn;
END;
[GLOBAL] FUNCTION terminalerrorcode : integer;
BEGIN
terminalerrorcode := terminalerror;
END;
[GLOBAL] PROCEDURE ttywritestring( string : VARYING [limit] OF CHAR);
BEGIN
putstringtoterminal(string, cursorrow, cursorcolumn, false, false);
END;
[GLOBAL] PROCEDURE ttywriteint( int : integer );
const
maxintchars = 20;
var
s : varying[maxintchars] of char;
BEGIN
writev(s, int:1);
ttywritestring( s )
END;
[GLOBAL] PROCEDURE ttywritereal( floating : real; fieldwidth,
ndigits : integer);
const
maxfieldwidth = 30;
var
s : varying[maxfieldwidth] of char;
BEGIN
writev(s, floating:fieldwidth:ndigits);
ttywritestring( s )
END;
END.
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