"

 COPYRIGHT (c) 1989 by Claus Gittinger

              All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

FileStream subclass:#DirectoryStream

       instanceVariableNames:'dirPointer readAhead'

       classVariableNames:''

       poolDictionaries:''

       category:'Streams-External'

!

DirectoryStream comment:'

COPYRIGHT (c) 1989 by Claus Gittinger

              All Rights Reserved

%{

#include <stdio.h>

#include <errno.h>

#ifndef transputer

# include <sys/types.h>

# include <sys/stat.h>

# ifdef HAS_OPENDIR

#  include <sys/types.h>

#  ifdef NEXT

#   include <sys/dir.h>

#  else

#   include <dirent.h>

#  endif

# endif

#endif

%}

!DirectoryStream methodsFor:'instance release'!

closeFile

    "a directoryStream has been collected - close it"

%{

#ifdef HAS_OPENDIR

    closedir((DIR *)MKFD(_INST(dirPointer)));

#endif

%}

! !

!DirectoryStream class methodsFor:'instance creation'!

directoryNamed:dirName

    "return a DirectoryStream for directory named dirName, aString"

    |newStream|

    newStream := (self basicNew) pathName:dirName.

    newStream openForReading isNil ifTrue:[^nil].

    ^ newStream

! !

!DirectoryStream methodsFor:'access reading'!

nextLine

    "return the next filename as a string"

    |prevEntry nextEntry|

%{

#ifdef HAS_OPENDIR

    DIR *d;

#ifdef NEXT

    struct direct *dp;

#else

    struct dirent *dp;

#endif

    extern errno;

    if (_INST(dirPointer) != nil) {

        d = (DIR *)MKFD(_INST(dirPointer));

        do {

            dp = readdir(d);

        } while ((dp == NULL) && (errno == EINTR));

        if (dp != NULL) {

            nextEntry = _MKSTRING((char *)(dp->d_name) COMMA_CON);

        }

        ExternalStream_LastErrorNumber = _MKSMALLINT(errno);

    }

#endif

%}

.

    prevEntry := readAhead.

    readAhead := nextEntry.

    ^ prevEntry

! !

!DirectoryStream methodsFor:'private'!

openForReading

    "open the file for readonly"

    |retVal|

    mode := #readonly.

%{

#ifdef HAS_OPENDIR

    DIR *d;

    OBJ path;

    extern errno;

    retVal = false;

    if (_INST(dirPointer) == nil) {

        path = _INST(pathName);

        if (__isString(path)) {

            do {

                d = opendir((char *) _stringVal(path));

            } while ((d == NULL) && (errno == EINTR));

            if (d == NULL) {

                ExternalStream_LastErrorNumber = _MKSMALLINT(errno);

            } else {

                _INST(dirPointer) = MKOBJ(d);

                retVal = true;

            }

        }

    }

#endif

%}

.

    retVal isNil ifTrue:[

        "opendir not avalable - use slow pipe"

        ^ PipeStream readingFrom:('cd ' , pathName , '; ls -a')

    ].

    (retVal == true) ifTrue:[

        Lobby register:self.

        self nextLine. "read 1st entry into readAhead buffer"

        ^ self

    ].

    ^ nil

!

reOpen

    "reOpen the stream after image restart"

    dirPointer := nil.

    super reOpen

! !

!DirectoryStream methodsFor:'testing'!

atEnd

    "return true, if position is at end"

    ^ readAhead == nil

! !

!DirectoryStream methodsFor:'closing'!

close

    "close the stream - tell operating system"

    dirPointer notNil ifTrue:[

        Lobby unregister:self.

        self closeFile.

        dirPointer := nil

    ]

! !