112 lines
1.9 KiB
Modula-2
112 lines
1.9 KiB
Modula-2
#
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(*
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(c) copyright 1988 by the Vrije Universiteit, Amsterdam, The Netherlands.
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See the copyright notice in the ACK home directory, in the file "Copyright".
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*)
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(*$R-*)
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IMPLEMENTATION MODULE Terminal;
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(*
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Module: Input/Output to/from terminals
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Author: Ceriel J.H. Jacobs
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Version: $Header$
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Implementation for Unix.
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*)
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IMPORT Unix;
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FROM SYSTEM IMPORT ADR;
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VAR fildes: INTEGER;
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unreadch: CHAR;
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unread: BOOLEAN;
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tty: ARRAY[0..8] OF CHAR;
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PROCEDURE Read(VAR ch: CHAR);
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BEGIN
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IF unread THEN
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ch := unreadch;
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unread := FALSE
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ELSE
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IF Unix.read(fildes, ADR(ch), 1) < 0 THEN
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;
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END;
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END;
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unreadch := ch;
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END Read;
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PROCEDURE BusyRead(VAR ch: CHAR);
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VAR l: INTEGER;
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BEGIN
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IF unread THEN
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ch := unreadch;
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unread := FALSE
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ELSE
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#ifdef __USG
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l := Unix.fcntl(fildes, (*FGETFL*) 3, 0);
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IF Unix.fcntl(fildes,
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(* FSETFL *) 4,
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l + (*ONDELAY*) 2) < 0 THEN
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;
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END;
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IF Unix.read(fildes, ADR(ch), 1) = 0 THEN
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ch := 0C;
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ELSE
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unreadch := ch;
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END;
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IF Unix.fcntl(fildes, (*FSETFL*)4, l) < 0 THEN
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;
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END;
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#else
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#ifdef __BSD4_2
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IF Unix.ioctl(fildes, INTEGER(ORD('f')*256+127+4*65536+40000000H), ADR(l)) < 0 THEN
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#else
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IF Unix.ioctl(fildes, INTEGER(ORD('f')*256+127), ADR(l)) < 0 THEN
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#endif
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;
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END;
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IF l = 0 THEN
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ch := 0C;
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ELSE
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IF Unix.read(fildes, ADR(ch), 1) < 0 THEN
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;
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END;
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unreadch := ch;
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END;
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#endif
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END;
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END BusyRead;
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PROCEDURE ReadAgain;
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BEGIN
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unread := TRUE;
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END ReadAgain;
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PROCEDURE Write(ch: CHAR);
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BEGIN
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IF Unix.write(fildes, ADR(ch), 1) < 0 THEN
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;
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END;
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END Write;
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PROCEDURE WriteLn;
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BEGIN
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Write(12C);
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END WriteLn;
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PROCEDURE WriteString(s: ARRAY OF CHAR);
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VAR i: CARDINAL;
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BEGIN
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i := 0;
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WHILE (i <= HIGH(s)) & (s[i] # 0C) DO
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Write(s[i]);
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INC(i)
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END
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END WriteString;
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BEGIN
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tty := "/dev/tty";
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fildes := Unix.open(ADR(tty), 2);
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unread := FALSE;
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END Terminal.
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