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smalltalk-1.1.1
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FileStream.st
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1991-09-12
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"======================================================================
|
| FileStream Method Definitions
|
======================================================================"
"======================================================================
|
| Copyright (C) 1990, 1991 Free Software Foundation, Inc.
| Written by Steve Byrne.
|
| This file is part of GNU Smalltalk.
|
| GNU Smalltalk is free software; you can redistribute it and/or modify it
| under the terms of the GNU General Public License as published by the Free
| Software Foundation; either version 1, or (at your option) any later version.
|
| GNU Smalltalk is distributed in the hope that it will be useful, but WITHOUT
| ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
| FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
| details.
|
| You should have received a copy of the GNU General Public License along with
| GNU Smalltalk; see the file COPYING. If not, write to the Free Software
| Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
|
======================================================================"
"
| Change Log
| ============================================================================
| Author Date Change
| sbyrne 19 May 90 Rewrite contents to take advantage of the new
| FileStream>>size method.
|
| sbyrne 19 Dec 89 added fileIn: and primitive file in.
|
| sbyrne 21 May 89 created.
|
"
ReadWriteStream subclass: #FileStream
instanceVariableNames: 'file name'
classVariableNames: ''
poolDictionaries: ''
category: nil.
FileStream comment:
'My instances are what conventional programmers think of as files.
My instance creation methods accept the name of a disk file (or any named
file object, such as /dev/rmt0 on UNIX or MTA0: on VMS).' !
!FileStream class methodsFor: 'basic'!
open: fileName mode: fileMode
| file |
file _ FileStream new.
file fileOp: 0 with: fileName with: fileMode.
^file
!
popen: commandName dir: direction
| file |
file _ FileStream new.
file fileOp: 7 with: commandName with: direction.
^file
!
fileIn: aFileName
| fileStream |
fileStream _ self open: aFileName mode: 'r'.
fileStream fileIn.
fileStream close
!!
!FileStream methodsFor: 'basic'!
close
self fileOp: 1
!
next
^self fileOp: 2
!
nextPut: aChar
self fileOp: 3 with: aChar
!
position: bytePosition
self fileOp: 4 with: bytePosition
!
position
^self fileOp: 5
!
contents
| str size | "this is a ### HACK"
size _ self size.
str _ String new: size.
1 to: size do:
[ :i | str at: i put: (self next) ].
^str
!
size
"Return the current size of the file, in bytes"
^self fileOp: 8
!!
!FileStream methodsFor: 'overriding inherited methods'!
reset
self position: 0
!
setToEnd
self position: self size
!
skip: anInteger
| pos |
pos _ ((self position + anInteger) max: 0) min: self size - 1.
self position: pos
!
reverseContents
^(ReadStream on: self contents) reverseContents
!
isEmpty
^self size == 0
!!
!FileStream methodsFor: 'testing'!
atEnd
^self fileOp: 6
!!