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"
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COPYRIGHT (c) 1989 by Claus Gittinger
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All Rights Reserved
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This software is furnished under a license and may be used
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only in accordance with the terms of that license and with the
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inclusion of the above copyright notice. This software may not
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be provided or otherwise made available to, or used by, any
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other person. No title to or ownership of the software is
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hereby transferred.
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"
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ExternalStream subclass:#NonPositionableExternalStream
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instanceVariableNames:''
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classVariableNames:'StdInStream StdOutStream StdErrorStream'
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poolDictionaries:''
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category:'Streams-External'
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!
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NonPositionableExternalStream comment:'
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COPYRIGHT (c) 1989 by Claus Gittinger
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All Rights Reserved
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'!
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%{
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#include <stdio.h>
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%}
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!NonPositionableExternalStream class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 1989 by Claus Gittinger
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All Rights Reserved
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This software is furnished under a license and may be used
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only in accordance with the terms of that license and with the
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inclusion of the above copyright notice. This software may not
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be provided or otherwise made available to, or used by, any
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other person. No title to or ownership of the software is
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hereby transferred.
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"
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!
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version
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"
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$Header: /cvs/stx/stx/libbasic/NonPositionableExternalStream.st,v 1.7 1994-06-02 16:20:59 claus Exp $
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"
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!
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documentation
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"
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This class provides common protocol for all non-positionable,
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external streams. Concrete subclasses are terminal streams, pipe streams,
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PrinterStreams, Sockets etc.
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There are three special instances of this class, representing stdin,
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stdout and stderr of the smalltalk/X process (see Unix manuals, if you
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dont know what those are used for).
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"
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! !
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!NonPositionableExternalStream class methodsFor:'instance creation'!
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forStdin
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"return a NonPositionableExternalStream object for reading from
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Unixes standard input file descriptor"
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StdInStream isNil ifTrue:[
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StdInStream := self basicNew initializeForStdin
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].
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^ StdInStream
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1
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!
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forStdout
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"return a NonPositionableExternalStream object for writing to
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Unixes standard output file descriptor"
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StdOutStream isNil ifTrue:[
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StdOutStream := self basicNew initializeForStdout
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].
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^ StdOutStream
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!
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forStderr
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"return a NonPositionableExternalStream object for writing to
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Unixes standard error output file descriptor"
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StdErrorStream isNil ifTrue:[
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StdErrorStream := self basicNew initializeForStderr
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].
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^ StdErrorStream
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! !
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!NonPositionableExternalStream methodsFor:'private'!
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initializeForStdin
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"setup for reading stdin"
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mode := #readonly.
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buffered := true.
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%{
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_INST(filePointer) = MKOBJ(stdin);
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%}
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!
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initializeForStdout
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"setup for writing to stdout"
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mode := #readwrite.
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buffered := false.
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%{
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_INST(filePointer) = MKOBJ(stdout);
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%}
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!
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initializeForStderr
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"setup for writing to stderr"
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mode := #readwrite.
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buffered := false.
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%{
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_INST(filePointer) = MKOBJ(stderr);
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%}
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!
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reOpen
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"reopen the stream after an image restart.
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If I am one of the standard streams, reopen is easy"
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1
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(self == #StdInStream) ifTrue:[
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^ self initializeForStdin
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].
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(self == #StdOutStream) ifTrue:[
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^ self initializeForStdout
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].
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(self == #StdErrorStream) ifTrue:[
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^ self initializeForStderr
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].
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^ super reOpen
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! !
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!NonPositionableExternalStream methodsFor:'redefind basic'!
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1
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size
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"report an error that this stream has no concept of size"
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self shouldNotImplement
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!
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1
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position
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10
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"report an error that this stream has no concept of position"
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self shouldNotImplement
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!
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position:anInteger
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10
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158 |
"report an error that this stream has no concept of position"
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159 |
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self shouldNotImplement
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1
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! !
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