116 lines
3.5 KiB
Modula-2
116 lines
3.5 KiB
Modula-2
DEFINITION MODULE InOut;
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(*
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Module: Wirth's Input/Output module
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From: "Programming in Modula-2", 3rd, corrected edition, by N. Wirth
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Version: $Id$
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*)
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CONST EOL = 12C;
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VAR Done : BOOLEAN;
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termCH : CHAR;
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PROCEDURE OpenInput(defext: ARRAY OF CHAR);
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(* Request a file name from the standard input stream and open
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this file for reading.
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If the filename ends with a '.', append the "defext" extension.
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Done := "file was successfully opened".
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If open, subsequent input is read from this file.
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*)
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PROCEDURE OpenOutput(defext : ARRAY OF CHAR);
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(* Request a file name from the standard input stream and open
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this file for writing.
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If the filename ends with a '.', append the "defext" extension.
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Done := "file was successfully opened".
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If open, subsequent output is written to this file.
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Files left open at program termination are automatically closed.
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*)
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PROCEDURE OpenInputFile(filename: ARRAY OF CHAR);
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(* Like OpenInput, but filename given as parameter.
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This procedure is not in Wirth's InOut.
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*)
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PROCEDURE OpenOutputFile(filename: ARRAY OF CHAR);
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(* Like OpenOutput, but filename given as parameter.
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This procedure is not in Wirth's InOut.
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*)
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PROCEDURE CloseInput;
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(* Close input file. Subsequent input is read from the standard input
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stream.
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*)
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PROCEDURE CloseOutput;
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(* Close output file. Subsequent output is written to the standard
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output stream.
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*)
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PROCEDURE Read(VAR ch : CHAR);
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(* Read a character from the current input stream and leave it in "ch".
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Done := NOT "end of file".
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*)
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PROCEDURE ReadString(VAR s : ARRAY OF CHAR);
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(* Read a string from the current input stream and leave it in "s".
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A string is any sequence of characters not containing blanks or
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control characters; leading blanks are ignored.
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Input is terminated by any character <= " ".
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This character is assigned to termCH.
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DEL or BACKSPACE is used for backspacing when input from terminal.
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*)
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PROCEDURE ReadInt(VAR x : INTEGER);
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(* Read a string and convert it to INTEGER.
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Syntax: integer = ['+'|'-'] digit {digit}.
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Leading blanks are ignored.
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Done := "integer was read".
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*)
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PROCEDURE ReadCard(VAR x : CARDINAL);
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(* Read a string and convert it to CARDINAL.
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Syntax: cardinal = digit {digit}.
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Leading blanks are ignored.
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Done := "cardinal was read".
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*)
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PROCEDURE Write(ch : CHAR);
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(* Write character "ch" to the current output stream.
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*)
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PROCEDURE WriteLn;
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(* Terminate line.
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*)
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PROCEDURE WriteString(s : ARRAY OF CHAR);
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(* Write string "s" to the current output stream
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*)
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PROCEDURE WriteInt(x : INTEGER; n : CARDINAL);
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(* Write integer x with (at least) n characters on the current output
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stream. If n is greater that the number of digits needed,
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blanks are added preceding the number.
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*)
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PROCEDURE WriteCard(x, n : CARDINAL);
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(* Write cardinal x with (at least) n characters on the current output
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stream. If n is greater that the number of digits needed,
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blanks are added preceding the number.
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*)
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PROCEDURE WriteOct(x, n : CARDINAL);
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(* Write cardinal x as an octal number with (at least) n characters
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on the current output stream.
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If n is greater that the number of digits needed,
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blanks are added preceding the number.
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*)
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PROCEDURE WriteHex(x, n : CARDINAL);
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(* Write cardinal x as a hexadecimal number with (at least)
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n characters on the current output stream.
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If n is greater that the number of digits needed,
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blanks are added preceding the number.
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*)
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END InOut.
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