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// -*- C++ -*-
//=============================================================================
/**
* @file Dirent.h
*
* Define a portable C++ interface to ACE_OS_Dirent directory-entry
* manipulation.
*
* @author Douglas C. Schmidt <d.schmidt@vanderbilt.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:
/// Default constructor.
ACE_Dirent ();
/// Constructor calls @c 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 @c closedir().
~ACE_Dirent ();
/// Closes the directory stream and frees the ACE_DIR structure.
void close ();
// = 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. @c read() shall not return
* directory entries containing empty names. It is unspecified
* whether entries are returned for dot or dot-dot. The pointer
* returned by @c read() points to data that may be overwritten by
* another call to @c read() on the same directory stream. This
* data shall not be overwritten by another call to @c read() on a
* different directory stream. @c read() may buffer several
* directory entries per actual read operation; @c read() marks for
* update the st_atime field of the directory each time the
* directory is actually read.
*/
ACE_DIRENT *read ();
// = Manipulators.
/// Returns the current location associated with the directory
/// stream.
long tell ();
/**
* Sets the position of the next @c read() operation on the
* directory stream. The new position reverts to the position
* associated with the directory stream at the time the @c tell()
* operation that provides loc was performed. Values returned by
* @c tell() 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 @c telldir() value may be invalidated due to
* undetected directory compaction. It is safe to use a previous
* @c telldir() value immediately after a call to @c 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
* @c opendir() would.
*/
void rewind ();
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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