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// -*- C++ -*-
//=============================================================================
/**
* @file Dirent.h
*
* $Id$
*
* Define a portable C++ interface to ACE_OS_Dirent directory-entry
* manipulation.
*
* @author Douglas C. Schmidt <schmidt@cs.wustl.edu>
*/
//=============================================================================
#ifndef ACE_DIRENT_H
#define ACE_DIRENT_H
#include /**/ "ace/pre.h"
#include /**/ "ace/ACE_export.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ace/OS_NS_dirent.h"
ACE_BEGIN_VERSIONED_NAMESPACE_DECL
/**
* @class ACE_Dirent
*
* @brief Define a portable C++ directory-entry iterator based on the POSIX API.
*/
class ACE_Export ACE_Dirent
{
public:
// = Initialization and termination methods.
/// Default constructor.
ACE_Dirent (void);
/// Constructor calls <opendir>
explicit ACE_Dirent (const ACE_TCHAR *dirname);
/// Opens the directory named by filename and associates a directory
/// stream with it.
int open (const ACE_TCHAR *filename);
/// Destructor calls <closedir>.
~ACE_Dirent (void);
/// Closes the directory stream and frees the <ACE_DIR> structure.
void close (void);
// = Iterator methods.
/**
* Returns a pointer to a structure representing the directory entry
* at the current position in the directory stream to which dirp
* refers, and positions the directory stream at the next entry,
* except on read-only filesystems. It returns a NULL pointer upon
* reaching the end of the directory stream, or upon detecting an
* invalid location in the directory. <readdir> shall not return
* directory entries containing empty names. It is unspecified
* whether entries are returned for dot or dot-dot. The pointer
* returned by <readdir> points to data that may be overwritten by
* another call to <readdir> on the same directory stream. This
* data shall not be overwritten by another call to <readdir> on a
* different directory stream. <readdir> may buffer several
* directory entries per actual read operation; <readdir> marks for
* update the st_atime field of the directory each time the
* directory is actually read.
*/
ACE_DIRENT *read (void);
/**
* Has the equivalent functionality as <readdir> except that an
* @a entry and @a result buffer must be supplied by the caller to
* store the result.
*/
int read (struct ACE_DIRENT *entry,
struct ACE_DIRENT **result);
// = Manipulators.
/// Returns the current location associated with the directory
/// stream.
long tell (void);
/**
* Sets the position of the next <readdir> operation on the
* directory stream. The new position reverts to the position
* associated with the directory stream at the time the <telldir>
* operation that provides loc was performed. Values returned by
* <telldir> are good only for the lifetime of the <ACE_DIR> pointer from
* which they are derived. If the directory is closed and then
* reopened, the <telldir> value may be invalidated due to
* undetected directory compaction. It is safe to use a previous
* <telldir> value immediately after a call to <opendir> and before
* any calls to readdir.
*/
void seek (long loc);
/**
* Resets the position of the directory stream to the beginning of
* the directory. It also causes the directory stream to refer to
* the current state of the corresponding directory, as a call to
* <opendir> would.
*/
void rewind (void);
private:
/// Pointer to the directory stream.
ACE_DIR *dirp_;
};
ACE_END_VERSIONED_NAMESPACE_DECL
#if defined (__ACE_INLINE__)
#include "ace/Dirent.inl"
#endif /* __ACE_INLINE__ */
#include /**/ "ace/post.h"
#endif /* ACE_DIRENT_H */
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