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dir.cpp
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C/C++ Source or Header
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2002-08-12
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9KB
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346 lines
/////////////////////////////////////////////////////////////////////////////
// Name: unix/dir.cpp
// Purpose: wxDir implementation for Unix/POSIX systems
// Author: Vadim Zeitlin
// Modified by:
// Created: 08.12.99
// RCS-ID: $Id: dir.cpp,v 1.8 2002/08/10 11:54:51 RR Exp $
// Copyright: (c) 1999 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
// Licence: wxWindows license
/////////////////////////////////////////////////////////////////////////////
// ============================================================================
// declarations
// ============================================================================
// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------
#ifdef __GNUG__
#pragma implementation "dir.h"
#endif
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#ifndef WX_PRECOMP
#include "wx/intl.h"
#include "wx/log.h"
#endif // PCH
#include "wx/dir.h"
#include "wx/filefn.h" // for wxMatchWild
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <dirent.h>
// ----------------------------------------------------------------------------
// macros
// ----------------------------------------------------------------------------
#define M_DIR ((wxDirData *)m_data)
// ----------------------------------------------------------------------------
// private classes
// ----------------------------------------------------------------------------
// this class stores everything we need to enumerate the files
class wxDirData
{
public:
wxDirData(const wxString& dirname);
~wxDirData();
bool IsOk() const { return m_dir != NULL; }
void SetFileSpec(const wxString& filespec) { m_filespec = filespec; }
void SetFlags(int flags) { m_flags = flags; }
void Rewind() { rewinddir(m_dir); }
bool Read(wxString *filename);
const wxString& GetName() const { return m_dirname; }
private:
DIR *m_dir;
wxString m_dirname;
wxString m_filespec;
int m_flags;
};
// ============================================================================
// implementation
// ============================================================================
// ----------------------------------------------------------------------------
// wxDirData
// ----------------------------------------------------------------------------
#if !defined( __VMS__ ) || ( __VMS_VER >= 70000000 )
wxDirData::wxDirData(const wxString& dirname)
: m_dirname(dirname)
{
m_dir = NULL;
// throw away the trailing slashes
size_t n = m_dirname.length();
wxCHECK_RET( n, _T("empty dir name in wxDir") );
while ( n > 0 && m_dirname[--n] == '/' )
;
m_dirname.Truncate(n + 1);
// do open the dir
m_dir = opendir(m_dirname.fn_str());
}
wxDirData::~wxDirData()
{
if ( m_dir )
{
if ( closedir(m_dir) != 0 )
{
wxLogLastError(_T("closedir"));
}
}
}
bool wxDirData::Read(wxString *filename)
{
dirent *de = (dirent *)NULL; // just to silence compiler warnings
bool matches = FALSE;
// speed up string concatenation in the loop a bit
wxString path = m_dirname;
path += _T('/');
path.reserve(path.length() + 255);
wxString de_d_name;
while ( !matches )
{
de = readdir(m_dir);
if ( !de )
return FALSE;
#if wxUSE_UNICODE
de_d_name = wxConvLibc.cMB2WC( de->d_name );
#else
de_d_name = de->d_name;
#endif
// don't return "." and ".." unless asked for
if ( de->d_name[0] == '.' &&
((de->d_name[1] == '.' && de->d_name[2] == '\0') ||
(de->d_name[1] == '\0')) )
{
if ( !(m_flags & wxDIR_DOTDOT) )
continue;
// we found a valid match
break;
}
// check the type now
if ( !(m_flags & wxDIR_FILES) && !wxDir::Exists(path + de_d_name) )
{
// it's a file, but we don't want them
continue;
}
else if ( !(m_flags & wxDIR_DIRS) && wxDir::Exists(path + de_d_name) )
{
// it's a dir, and we don't want it
continue;
}
// finally, check the name
if ( m_filespec.empty() )
{
matches = m_flags & wxDIR_HIDDEN ? TRUE : de->d_name[0] != '.';
}
else
{
#if wxUSE_UNICODE
matches = TRUE; // FIXME
#else
// test against the pattern
matches = wxMatchWild(m_filespec, de_d_name,
!(m_flags & wxDIR_HIDDEN));
#endif
}
}
*filename = de_d_name;
return TRUE;
}
#else // old VMS (TODO)
wxDirData::wxDirData(const wxString& WXUNUSED(dirname))
{
wxFAIL_MSG(_T("not implemented"));
}
wxDirData::~wxDirData()
{
}
bool wxDirData::Read(wxString * WXUNUSED(filename))
{
return FALSE;
}
#endif // not or new VMS/old VMS
// ----------------------------------------------------------------------------
// wxDir helpers
// ----------------------------------------------------------------------------
/* static */
bool wxDir::Exists(const wxString& dir)
{
return wxPathExists(dir);
}
// ----------------------------------------------------------------------------
// wxDir construction/destruction
// ----------------------------------------------------------------------------
wxDir::wxDir(const wxString& dirname)
{
m_data = NULL;
(void)Open(dirname);
}
bool wxDir::Open(const wxString& dirname)
{
delete M_DIR;
m_data = new wxDirData(dirname);
if ( !M_DIR->IsOk() )
{
wxLogSysError(_("Can not enumerate files in directory '%s'"),
dirname.c_str());
delete M_DIR;
m_data = NULL;
return FALSE;
}
return TRUE;
}
bool wxDir::IsOpened() const
{
return m_data != NULL;
}
wxString wxDir::GetName() const
{
wxString name;
if ( m_data )
{
name = M_DIR->GetName();
if ( !name.empty() && (name.Last() == _T('/')) )
{
// chop off the last (back)slash
name.Truncate(name.length() - 1);
}
}
return name;
}
wxDir::~wxDir()
{
delete M_DIR;
}
// ----------------------------------------------------------------------------
// wxDir enumerating
// ----------------------------------------------------------------------------
bool wxDir::GetFirst(wxString *filename,
const wxString& filespec,
int flags) const
{
wxCHECK_MSG( IsOpened(), FALSE, _T("must wxDir::Open() first") );
M_DIR->Rewind();
M_DIR->SetFileSpec(filespec);
M_DIR->SetFlags(flags);
return GetNext(filename);
}
bool wxDir::GetNext(wxString *filename) const
{
wxCHECK_MSG( IsOpened(), FALSE, _T("must wxDir::Open() first") );
wxCHECK_MSG( filename, FALSE, _T("bad pointer in wxDir::GetNext()") );
return M_DIR->Read(filename);
}
bool wxDir::HasSubDirs(const wxString& spec)
{
wxCHECK_MSG( IsOpened(), FALSE, _T("must wxDir::Open() first") );
if ( spec.empty() )
{
// faster check for presence of any subdirectory: normally each subdir
// has a hard link to the parent directory and so, knowing that there
// are at least "." and "..", we have a subdirectory if and only if
// links number is > 2 - this is just a guess but it works fairly well
// in practice
//
// note that we may guess wrongly in one direction only: i.e. we may
// return true when there are no subdirectories but this is ok as the
// caller will learn it soon enough when it calls GetFirst(wxDIR)
// anyhow
wxStructStat stBuf;
if ( wxStat(M_DIR->GetName().c_str(), &stBuf) == 0 )
{
switch ( stBuf.st_nlink )
{
case 2:
// just "." and ".."
return FALSE;
case 0:
case 1:
// weird filesystem, don't try to guess for it, use dumb
// method below
break;
default:
// assume we have subdirs - may turn out to be wrong if we
// have other hard links to this directory but it's not
// that bad as explained above
return TRUE;
}
}
}
// just try to find first directory
wxString s;
return GetFirst(&s, spec, wxDIR_DIRS | wxDIR_HIDDEN);
}