40 lines
870 B
Plaintext
40 lines
870 B
Plaintext
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(* Version 1.10, Nov 1984 *)
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DEFINITION MODULE Keyboard;
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(*
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Default driver for terminal input.
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[Private module of the Modula-2 system]
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Derived from the Lilith Modula-2 system developed by the
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group of Prof. N. Wirth at ETH Zurich, Switzerland.
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*)
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EXPORT QUALIFIED Read, KeyPressed;
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PROCEDURE Read (VAR ch: CHAR);
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(*
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- Read a character from the keyboard.
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out: ch character read
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If necessary, Read waits for a character to be entered.
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Characters that have been entered are returned
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immediately, with no echoing, editing or buffering.
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- Ctrl-C terminates the current program
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- ASCII.cr is transformed into ASCII.EOL
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*)
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PROCEDURE KeyPressed (): BOOLEAN;
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(*
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- Test if a character is available from the keyboard.
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out: returns TRUE if a character is available
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for reading
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*)
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END Keyboard.
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