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Ben Gras
443
lib/libm2/Streams.mod
Executable file
443
lib/libm2/Streams.mod
Executable file
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#
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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 Streams;
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(*
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Module: Stream Input/Output
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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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FROM SYSTEM IMPORT BYTE, ADR;
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FROM Epilogue IMPORT CallAtEnd;
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FROM Storage IMPORT Allocate, Available;
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FROM StripUnix IMPORT
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open, close, lseek, read, write, creat;
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IMPORT StripUnix;
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CONST BUFSIZ = 1024; (* tunable *)
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TYPE IOB = RECORD
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kind: StreamKind;
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mode: StreamMode;
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eof: BOOLEAN;
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buffering: StreamBuffering;
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next : Stream;
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fildes: INTEGER;
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cnt, maxcnt: INTEGER;
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bufferedcnt: INTEGER;
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buf: ARRAY[1..BUFSIZ] OF BYTE;
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END;
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Stream = POINTER TO IOB;
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VAR
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ibuf, obuf, ebuf: IOB;
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head: Stream;
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PROCEDURE getstruct(VAR stream: Stream);
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BEGIN
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stream := head;
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WHILE (stream # NIL) AND (stream^.kind # none) DO
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stream := stream^.next;
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END;
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IF stream = NIL THEN
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IF NOT Available(SIZE(IOB)) THEN
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RETURN;
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END;
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Allocate(stream,SIZE(IOB));
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stream^.next := head;
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head := stream;
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END;
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END getstruct;
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PROCEDURE freestruct(stream: Stream);
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BEGIN
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stream^.kind := none;
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END freestruct;
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PROCEDURE OpenStream(VAR stream: Stream;
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filename: ARRAY OF CHAR;
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kind: StreamKind;
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mode: StreamMode;
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VAR result: StreamResult);
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VAR fd: INTEGER;
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i: CARDINAL;
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BEGIN
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IF kind = none THEN
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result := illegaloperation;
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RETURN;
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END;
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getstruct(stream);
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IF stream = NIL THEN
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result := nomemory;
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RETURN;
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END;
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WITH stream^ DO
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FOR i := 0 TO HIGH(filename) DO
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buf[i+1] := BYTE(filename[i]);
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END;
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buf[HIGH(filename)+2] := BYTE(0C);
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END;
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IF (mode = reading) THEN
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fd := open(ADR(stream^.buf), 0);
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ELSE
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fd := -1;
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IF (mode = appending) THEN
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fd := open(ADR(stream^.buf), 1);
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IF fd >= 0 THEN
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IF (lseek(fd, 0D , 2) < 0D) THEN ; END;
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END;
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END;
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IF fd < 0 THEN
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fd := creat(ADR(stream^.buf), 666B);
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END;
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END;
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IF fd < 0 THEN
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result := openfailed;
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freestruct(stream);
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stream := NIL;
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RETURN;
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END;
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result := succeeded;
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stream^.fildes := fd;
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stream^.kind := kind;
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stream^.mode := mode;
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stream^.buffering := blockbuffered;
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stream^.bufferedcnt := BUFSIZ;
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stream^.maxcnt := 0;
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stream^.eof := FALSE;
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IF mode = reading THEN
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stream^.cnt := 1;
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ELSE
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stream^.cnt := 0;
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END;
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END OpenStream;
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PROCEDURE SetStreamBuffering( stream: Stream;
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b: StreamBuffering;
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VAR result: StreamResult);
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BEGIN
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result := succeeded;
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IF (stream = NIL) OR (stream^.kind = none) THEN
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result := nostream;
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RETURN;
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END;
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IF (stream^.mode = reading) OR
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((b = linebuffered) AND (stream^.kind = binary)) THEN
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result := illegaloperation;
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RETURN;
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END;
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FlushStream(stream, result);
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IF b = unbuffered THEN
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stream^.bufferedcnt := 1;
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END;
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stream^.buffering := b;
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END SetStreamBuffering;
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PROCEDURE FlushStream(stream: Stream; VAR result: StreamResult);
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VAR cnt1: INTEGER;
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BEGIN
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result := succeeded;
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IF (stream = NIL) OR (stream^.kind = none) THEN
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result := nostream;
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RETURN;
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END;
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WITH stream^ DO
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IF mode = reading THEN
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result := illegaloperation;
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RETURN;
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END;
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IF (cnt > 0) THEN
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cnt1 := cnt;
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cnt := 0;
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IF write(fildes, ADR(buf), cnt1) < 0 THEN END;
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END;
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END;
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END FlushStream;
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PROCEDURE CloseStream(VAR stream: Stream; VAR result: StreamResult);
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BEGIN
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IF (stream # NIL) AND (stream^.kind # none) THEN
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result := succeeded;
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IF stream^.mode # reading THEN
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FlushStream(stream, result);
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END;
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IF close(stream^.fildes) < 0 THEN ; END;
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freestruct(stream);
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ELSE
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result := nostream;
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END;
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stream := NIL;
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END CloseStream;
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PROCEDURE EndOfStream(stream: Stream; VAR result: StreamResult): BOOLEAN;
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BEGIN
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result := succeeded;
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IF (stream = NIL) OR (stream^.kind = none) THEN
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result := nostream;
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RETURN FALSE;
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END;
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IF stream^.mode # reading THEN
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result := illegaloperation;
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RETURN FALSE;
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END;
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IF stream^.eof THEN RETURN TRUE; END;
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RETURN (CHAR(NextByte(stream)) = 0C) AND stream^.eof;
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END EndOfStream;
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PROCEDURE FlushLineBuffers();
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VAR s: Stream;
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result: StreamResult;
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BEGIN
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s := head;
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WHILE s # NIL DO
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IF (s^.kind # none) AND (s^.buffering = linebuffered) THEN
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FlushStream(s, result);
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END;
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s := s^.next;
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END;
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END FlushLineBuffers;
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PROCEDURE NextByte(stream: Stream): BYTE;
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VAR c: BYTE;
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BEGIN
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WITH stream^ 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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IF eof THEN RETURN BYTE(0C); END;
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IF stream = InputStream THEN
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FlushLineBuffers();
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END;
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maxcnt := read(fildes, ADR(buf), bufferedcnt);
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cnt := 1;
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IF maxcnt <= 0 THEN
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eof := TRUE;
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c := BYTE(0C);
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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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END;
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RETURN c;
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END NextByte;
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PROCEDURE Read(stream: Stream; VAR ch: CHAR; VAR result: StreamResult);
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VAR EoF: BOOLEAN;
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BEGIN
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ch := 0C;
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EoF := EndOfStream(stream, result);
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IF result # succeeded THEN RETURN; END;
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IF EoF THEN
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result := endoffile;
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RETURN;
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END;
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WITH stream^ DO
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ch := CHAR(buf[cnt]);
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INC(cnt);
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END;
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END Read;
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PROCEDURE ReadByte(stream: Stream; VAR byte: BYTE; VAR result: StreamResult);
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VAR EoF: BOOLEAN;
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BEGIN
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byte := BYTE(0C);
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EoF := EndOfStream(stream, result);
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IF result # succeeded THEN RETURN; END;
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IF EoF THEN
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result := endoffile;
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RETURN;
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END;
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WITH stream^ DO
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byte := buf[cnt];
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INC(cnt);
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END;
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END ReadByte;
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PROCEDURE ReadBytes(stream: Stream;
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VAR bytes: ARRAY OF BYTE;
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VAR result: StreamResult);
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VAR i: CARDINAL;
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BEGIN
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FOR i := 0 TO HIGH(bytes) DO
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ReadByte(stream, bytes[i], result);
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END;
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END ReadBytes;
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PROCEDURE Write(stream: Stream; ch: CHAR; VAR result: StreamResult);
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BEGIN
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IF (stream = NIL) OR (stream^.kind = none) THEN
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result := nostream;
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RETURN;
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END;
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IF (stream^.kind # text) OR (stream^.mode = reading) THEN
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result := illegaloperation;
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RETURN;
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END;
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WITH stream^ DO
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INC(cnt);
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buf[cnt] := BYTE(ch);
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IF (cnt >= bufferedcnt) OR
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((ch = 12C) AND (buffering = linebuffered))
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THEN
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FlushStream(stream, result);
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END;
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END;
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END Write;
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PROCEDURE WriteByte(stream: Stream; byte: BYTE; VAR result: StreamResult);
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BEGIN
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IF (stream = NIL) OR (stream^.kind = none) THEN
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result := nostream;
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RETURN;
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END;
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IF (stream^.kind # binary) OR (stream^.mode = reading) THEN
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result := illegaloperation;
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RETURN;
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END;
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WITH stream^ DO
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INC(cnt);
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buf[cnt] := byte;
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IF cnt >= bufferedcnt THEN
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FlushStream(stream, result);
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END;
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END;
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END WriteByte;
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PROCEDURE WriteBytes(stream: Stream; bytes: ARRAY OF BYTE; VAR result: StreamResult);
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VAR i: CARDINAL;
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BEGIN
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FOR i := 0 TO HIGH(bytes) DO
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WriteByte(stream, bytes[i], result);
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END;
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END WriteBytes;
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PROCEDURE EndIt;
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VAR h, h1 : Stream;
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result: StreamResult;
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BEGIN
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h := head;
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WHILE h # NIL DO
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h1 := h;
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CloseStream(h1, result);
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h := h^.next;
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END;
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END EndIt;
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PROCEDURE GetPosition(s: Stream; VAR position: LONGINT;
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VAR result: StreamResult);
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BEGIN
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IF (s = NIL) OR (s^.kind = none) THEN
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result := illegaloperation;
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RETURN;
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END;
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IF (s^.mode # reading) THEN FlushStream(s, result); END;
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position := lseek(s^.fildes, 0D, 1);
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IF position < 0D THEN
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result := illegaloperation;
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RETURN;
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END;
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IF s^.mode = reading THEN
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position := position + LONG(s^.maxcnt - s^.cnt + 1);
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END;
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END GetPosition;
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PROCEDURE SetPosition(s: Stream; position: LONGINT; VAR result: StreamResult);
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VAR currpos: LONGINT;
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BEGIN
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currpos := 0D;
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IF (s = NIL) OR (s^.kind = none) THEN
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result := nostream;
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RETURN;
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END;
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IF (s^.mode # reading) THEN
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FlushStream(s, result);
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ELSE
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s^.maxcnt := 0;
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s^.eof := FALSE;
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END;
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IF s^.mode = appending THEN
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currpos := lseek(s^.fildes, 0D, 1);
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IF currpos < 0D THEN
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result := illegaloperation;
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RETURN;
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END;
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END;
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IF position < currpos THEN
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result := illegaloperation;
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RETURN;
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END;
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currpos := lseek(s^.fildes, position, 0);
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IF currpos < 0D THEN
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result := illegaloperation;
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RETURN;
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END;
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result := succeeded;
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END SetPosition;
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PROCEDURE isatty(stream: Stream; VAR result: StreamResult): BOOLEAN;
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BEGIN
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IF (stream = NIL) OR (stream^.kind = none) THEN
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result := nostream;
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RETURN FALSE;
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END;
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RETURN StripUnix.isatty(stream^.fildes);
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END isatty;
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PROCEDURE InitStreams;
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VAR result: StreamResult;
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BEGIN
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InputStream := ADR(ibuf);
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OutputStream := ADR(obuf);
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ErrorStream := ADR(ebuf);
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WITH ibuf DO
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kind := text;
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mode := reading;
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eof := FALSE;
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next := ADR(obuf);
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fildes := 0;
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maxcnt := 0;
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cnt := 1;
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bufferedcnt := BUFSIZ;
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END;
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WITH obuf DO
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kind := text;
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mode := writing;
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eof := TRUE;
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next := ADR(ebuf);
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fildes := 1;
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maxcnt := 0;
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cnt := 0;
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bufferedcnt := BUFSIZ;
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IF isatty(OutputStream, result) THEN
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buffering := linebuffered;
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ELSE
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buffering := blockbuffered;
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END;
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END;
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WITH ebuf DO
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kind := text;
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mode := writing;
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eof := TRUE;
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next := NIL;
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fildes := 2;
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maxcnt := 0;
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cnt := 0;
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bufferedcnt := BUFSIZ;
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IF isatty(ErrorStream, result) THEN
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buffering := linebuffered;
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ELSE
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buffering := blockbuffered;
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END;
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END;
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head := InputStream;
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IF CallAtEnd(EndIt) THEN ; END;
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END InitStreams;
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BEGIN
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InitStreams
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END Streams.
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Reference in New Issue
Block a user