468 lines
9.1 KiB
Modula-2
468 lines
9.1 KiB
Modula-2
IMPLEMENTATION MODULE PascalIO;
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IMPORT Unix;
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IMPORT Conversions;
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IMPORT Traps;
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IMPORT RealConversions;
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FROM TTY IMPORT isatty;
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FROM Storage IMPORT ALLOCATE;
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FROM SYSTEM IMPORT ADR;
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TYPE charset = SET OF CHAR;
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btype = (reading, writing, free);
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CONST BUFSIZ = 1024; (* Tunable *)
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spaces = charset{11C, 12C, 13C, 14C, 15C, ' '};
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TYPE IOBuf = RECORD
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type: btype;
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eof: BOOLEAN;
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next: Text;
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fildes: INTEGER;
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cnt: INTEGER;
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maxcnt: INTEGER;
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bufferedcount: INTEGER;
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buf: ARRAY [1..BUFSIZ] OF CHAR;
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END;
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Text = POINTER TO IOBuf;
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numbuf = ARRAY[0..255] OF CHAR;
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VAR ibuf, obuf: IOBuf;
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head: Text;
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PROCEDURE Reset(VAR InputText: Text; Filename: ARRAY OF CHAR);
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BEGIN
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doclose(InputText);
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getstruct(InputText);
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WITH InputText^ DO
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eof := FALSE;
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fildes := Unix.open(ADR(Filename), 0);
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IF fildes < 0 THEN
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Traps.Message("could not open input file");
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HALT;
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END;
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type := reading;
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cnt := 1;
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maxcnt := 0;
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bufferedcount := BUFSIZ;
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END;
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END Reset;
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PROCEDURE Rewrite(VAR OutputText: Text; Filename: ARRAY OF CHAR);
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BEGIN
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doclose(OutputText);
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getstruct(OutputText);
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WITH OutputText^ DO
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eof := FALSE;
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fildes := Unix.creat(ADR(Filename), 666B);
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IF fildes < 0 THEN
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Traps.Message("could not open output file");
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HALT;
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END;
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type := writing;
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cnt := 0;
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maxcnt := 0;
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bufferedcount := BUFSIZ;
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END;
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END Rewrite;
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PROCEDURE CloseOutput();
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VAR text: Text;
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BEGIN
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text := head;
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WHILE text # NIL DO
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doclose(text);
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text := text^.next;
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END;
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END CloseOutput;
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PROCEDURE doclose(text: Text);
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VAR dummy: INTEGER;
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BEGIN
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IF text # Notext THEN
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WITH text^ DO
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IF type = writing THEN
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Flush(text);
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END;
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IF type # free THEN
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type := free;
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dummy := Unix.close(fildes);
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END;
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END;
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END;
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END doclose;
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PROCEDURE getstruct(VAR text: Text);
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BEGIN
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text := head;
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WHILE (text # NIL) AND (text^.type # free) DO
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text := text^.next;
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END;
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IF text = NIL THEN
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NEW(text);
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text^.next := head;
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head := text;
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END;
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END getstruct;
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PROCEDURE chk(text: Text; tp: btype);
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BEGIN
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IF text^.type # tp THEN
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IF tp = reading THEN
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Traps.Message("input text expected");
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ELSE
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Traps.Message("output text expected");
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END;
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HALT;
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END;
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END chk;
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PROCEDURE ReadChar(InputText: Text; VAR ch : CHAR);
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BEGIN
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ch := NextChar(InputText);
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Get(InputText);
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END ReadChar;
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PROCEDURE NextChar(InputText: Text): CHAR;
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VAR c: CHAR;
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BEGIN
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chk(InputText, reading);
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WITH InputText^ DO
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IF cnt <= maxcnt THEN
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c := buf[cnt];
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ELSE
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c := FillBuf(InputText);
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END;
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END;
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RETURN c;
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END NextChar;
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PROCEDURE Get(InputText: Text);
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VAR dummy: CHAR;
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BEGIN
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chk(InputText, reading);
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WITH InputText^ DO
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IF eof THEN
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Traps.Message("unexpected EOF");
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HALT;
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END;
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IF cnt > maxcnt THEN
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dummy := FillBuf(InputText);
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END;
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INC(cnt);
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END;
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END Get;
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PROCEDURE FillBuf(ib: Text) : CHAR;
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VAR c : CHAR;
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BEGIN
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WITH ib^ DO
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IF eof THEN RETURN 0C; END;
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maxcnt := Unix.read(fildes, ADR(buf), bufferedcount);
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cnt := 1;
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IF maxcnt <= 0 THEN
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c := 0C;
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eof := TRUE;
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ELSE
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c := buf[1];
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END;
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END;
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RETURN c;
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END FillBuf;
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PROCEDURE Eoln(InputText: Text): BOOLEAN;
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BEGIN
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RETURN NextChar(InputText) = 12C;
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END Eoln;
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PROCEDURE Eof(InputText: Text): BOOLEAN;
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BEGIN
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RETURN (NextChar(InputText) = 0C) AND InputText^.eof;
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END Eof;
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PROCEDURE ReadLn(InputText: Text);
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VAR ch: CHAR;
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BEGIN
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REPEAT
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ReadChar(InputText, ch)
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UNTIL ch = 12C;
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END ReadLn;
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PROCEDURE Flush(ob: Text);
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VAR dummy: INTEGER;
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BEGIN
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WITH ob^ DO
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dummy := Unix.write(fildes, ADR(buf), cnt);
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cnt := 0;
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END;
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END Flush;
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PROCEDURE WriteChar(OutputText: Text; ch: CHAR);
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BEGIN
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chk(OutputText, writing);
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WITH OutputText^ DO
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INC(cnt);
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buf[cnt] := ch;
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IF cnt >= bufferedcount THEN
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Flush(OutputText);
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END;
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END;
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END WriteChar;
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PROCEDURE WriteLn(OutputText: Text);
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BEGIN
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WriteChar(OutputText, 12C);
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END WriteLn;
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PROCEDURE Page(OutputText: Text);
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BEGIN
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WriteChar(OutputText, 14C);
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END Page;
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PROCEDURE ReadInteger(InputText: Text; VAR int : INTEGER);
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CONST
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SAFELIMITDIV10 = MAX(INTEGER) DIV 10;
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SAFELIMITREM10 = MAX(INTEGER) MOD 10;
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VAR
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neg : BOOLEAN;
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safedigit: CARDINAL;
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ch: CHAR;
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chvalue: CARDINAL;
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BEGIN
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WHILE NextChar(InputText) IN spaces DO
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Get(InputText);
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END;
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ch := NextChar(InputText);
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IF ch = '-' THEN
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Get(InputText);
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ch := NextChar(InputText);
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neg := TRUE;
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ELSIF ch = '+' THEN
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Get(InputText);
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ch := NextChar(InputText);
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neg := FALSE;
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ELSE
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neg := FALSE
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END;
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safedigit := SAFELIMITREM10;
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IF neg THEN safedigit := safedigit + 1 END;
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int := 0;
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IF (ch >= '0') AND (ch <= '9') THEN
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WHILE (ch >= '0') & (ch <= '9') DO
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chvalue := ORD(ch) - ORD('0');
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IF (int < -SAFELIMITDIV10) OR
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( (int = -SAFELIMITDIV10) AND
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(chvalue > safedigit)) THEN
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Traps.Message("integer too large");
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HALT;
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ELSE
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int := 10*int - VAL(INTEGER, chvalue);
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Get(InputText);
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ch := NextChar(InputText);
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END;
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END;
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IF NOT neg THEN
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int := -int
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END;
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ELSE
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Traps.Message("integer expected");
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HALT;
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END;
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END ReadInteger;
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PROCEDURE ReadCardinal(InputText: Text; VAR card : CARDINAL);
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CONST
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SAFELIMITDIV10 = MAX(CARDINAL) DIV 10;
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SAFELIMITREM10 = MAX(CARDINAL) MOD 10;
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VAR
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ch : CHAR;
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safedigit: CARDINAL;
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chvalue: CARDINAL;
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BEGIN
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WHILE NextChar(InputText) IN spaces DO
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Get(InputText);
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END;
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ch := NextChar(InputText);
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safedigit := SAFELIMITREM10;
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card := 0;
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IF (ch >= '0') AND (ch <= '9') THEN
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WHILE (ch >= '0') & (ch <= '9') DO
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chvalue := ORD(ch) - ORD('0');
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IF (card > SAFELIMITDIV10) OR
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( (card = SAFELIMITDIV10) AND
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(chvalue > safedigit)) THEN
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Traps.Message("cardinal too large");
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HALT;
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ELSE
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card := 10*card + chvalue;
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Get(InputText);
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ch := NextChar(InputText);
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END;
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END;
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ELSE
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Traps.Message("cardinal expected");
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HALT;
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END;
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END ReadCardinal;
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PROCEDURE ReadReal(InputText: Text; VAR real: REAL);
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VAR
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buf: numbuf;
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ch: CHAR;
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ok: BOOLEAN;
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index: INTEGER;
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PROCEDURE inch(): CHAR;
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BEGIN
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buf[index] := ch;
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INC(index);
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Get(InputText);
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RETURN NextChar(InputText);
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END inch;
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BEGIN
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index := 0;
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ok := TRUE;
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WHILE NextChar(InputText) IN spaces DO
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Get(InputText);
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END;
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ch := NextChar(InputText);
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IF (ch ='+') OR (ch = '-') THEN
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ch := inch();
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END;
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IF (ch >= '0') AND (ch <= '9') THEN
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WHILE (ch >= '0') AND (ch <= '9') DO
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ch := inch();
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END;
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IF (ch = '.') THEN
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ch := inch();
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IF (ch >= '0') AND (ch <= '9') THEN
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WHILE (ch >= '0') AND (ch <= '9') DO
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ch := inch();
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END;
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ELSE
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ok := FALSE;
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END;
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END;
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IF ok AND (ch = 'E') THEN
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ch := inch();
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IF (ch ='+') OR (ch = '-') THEN
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ch := inch();
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END;
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IF (ch >= '0') AND (ch <= '9') THEN
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WHILE (ch >= '0') AND (ch <= '9') DO
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ch := inch();
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END;
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ELSE
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ok := FALSE;
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END;
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END;
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ELSE
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ok := FALSE;
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END;
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IF ok THEN
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buf[index] := 0C;
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RealConversions.StringToReal(buf, real, ok);
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END;
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IF NOT ok THEN
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Traps.Message("Illegal real");
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HALT;
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END;
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END ReadReal;
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PROCEDURE WriteCardinal(OutputText: Text; card: CARDINAL; width: CARDINAL);
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VAR
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buf : numbuf;
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BEGIN
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Conversions.ConvertCardinal(card, 1, buf);
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WriteString(OutputText, buf, width);
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END WriteCardinal;
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PROCEDURE WriteInteger(OutputText: Text; int: INTEGER; width: CARDINAL);
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VAR
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buf : numbuf;
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BEGIN
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Conversions.ConvertInteger(int, 1, buf);
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WriteString(OutputText, buf, width);
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END WriteInteger;
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PROCEDURE WriteBoolean(OutputText: Text; bool: BOOLEAN; width: CARDINAL);
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BEGIN
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IF bool THEN
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WriteString(OutputText, " TRUE", width);
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ELSE
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WriteString(OutputText, "FALSE", width);
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END;
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END WriteBoolean;
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PROCEDURE WriteReal(OutputText: Text; real: REAL; width, nfrac: CARDINAL);
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VAR
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buf: numbuf;
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ok: BOOLEAN;
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digits: INTEGER;
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BEGIN
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IF width > SIZE(buf) THEN
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width := SIZE(buf);
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END;
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IF nfrac > 0 THEN
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RealConversions.RealToString(real, width, nfrac, buf, ok);
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ELSE
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IF width < 9 THEN width := 9; END;
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IF real < 0.0 THEN
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digits := 7 - INTEGER(width);
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ELSE
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digits := 6 - INTEGER(width);
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END;
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RealConversions.RealToString(real, width, digits, buf, ok);
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END;
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WriteString(OutputText, buf, 0);
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END WriteReal;
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PROCEDURE WriteString(OutputText: Text; str: ARRAY OF CHAR; width: CARDINAL);
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VAR index: CARDINAL;
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BEGIN
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index := 0;
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WHILE (index <= HIGH(str)) AND (str[index] # Eos) DO
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INC(index);
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END;
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WHILE index < width DO
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WriteChar(OutputText, " ");
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INC(index);
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END;
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index := 0;
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WHILE (index <= HIGH(str)) AND (str[index] # Eos) DO
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WriteChar(OutputText, str[index]);
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INC(index);
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END;
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END WriteString;
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BEGIN (* PascalIO initialization *)
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WITH ibuf DO
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eof := FALSE;
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type := reading;
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fildes := 0;
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bufferedcount := BUFSIZ;
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maxcnt := 0;
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cnt := 1;
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END;
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WITH obuf DO
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eof := FALSE;
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type := writing;
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fildes := 1;
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IF isatty(1) THEN
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bufferedcount := 1;
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ELSE
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bufferedcount := BUFSIZ;
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END;
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cnt := 0;
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END;
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Notext := NIL;
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Input := ADR(ibuf);
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Output := ADR(obuf);
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Input^.next := Output;
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Output^.next := NIL;
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head := Input;
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END PascalIO.
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