src/unix/dir.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        unix/dir.cpp
   3 // Purpose:     wxDir implementation for Unix/POSIX systems
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     08.12.99
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1999 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  21     #pragma implementation "dir.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28     #pragma hdrstop
  29 #endif
  30
  31 #ifndef WX_PRECOMP
  32     #include "wx/intl.h"
  33     #include "wx/log.h"
  34 #endif // PCH
  35
  36 #include "wx/dir.h"
  37 #include "wx/filefn.h"          // for wxMatchWild
  38
  39 #include <sys/types.h>
  40 #include <sys/stat.h>
  41 #include <unistd.h>
  42
  43 #include <dirent.h>
  44
  45 // ----------------------------------------------------------------------------
  46 // macros
  47 // ----------------------------------------------------------------------------
  48
  49 #define M_DIR       ((wxDirData *)m_data)
  50
  51 // ----------------------------------------------------------------------------
  52 // private classes
  53 // ----------------------------------------------------------------------------
  54
  55 // this class stores everything we need to enumerate the files
  56 class wxDirData
  57 {
  58 public:
  59     wxDirData(const wxString& dirname);
  60     ~wxDirData();
  61
  62     bool IsOk() const { return m_dir != NULL; }
  63
  64     void SetFileSpec(const wxString& filespec) { m_filespec = filespec; }
  65     void SetFlags(int flags) { m_flags = flags; }
  66
  67     void Rewind() { rewinddir(m_dir); }
  68     bool Read(wxString *filename);
  69
  70     const wxString& GetName() const { return m_dirname; }
  71
  72 private:
  73     DIR     *m_dir;
  74
  75     wxString m_dirname;
  76     wxString m_filespec;
  77
  78     int      m_flags;
  79 };
  80
  81 // ============================================================================
  82 // implementation
  83 // ============================================================================
  84
  85 // ----------------------------------------------------------------------------
  86 // wxDirData
  87 // ----------------------------------------------------------------------------
  88
  89 #if !defined( __VMS__ ) || ( __VMS_VER >= 70000000 )
  90
  91 wxDirData::wxDirData(const wxString& dirname)
  92          : m_dirname(dirname)
  93 {
  94     m_dir = NULL;
  95
  96     // throw away the trailing slashes
  97     size_t n = m_dirname.length();
  98     wxCHECK_RET( n, _T("empty dir name in wxDir") );
  99
 100     while ( n > 0 && m_dirname[--n] == '/' )
 101         ;
 102
 103     m_dirname.Truncate(n + 1);
 104
 105     // do open the dir
 106     m_dir = opendir(m_dirname.fn_str());
 107 }
 108
 109 wxDirData::~wxDirData()
 110 {
 111     if ( m_dir )
 112     {
 113         if ( closedir(m_dir) != 0 )
 114         {
 115             wxLogLastError(_T("closedir"));
 116         }
 117     }
 118 }
 119
 120 bool wxDirData::Read(wxString *filename)
 121 {
 122     dirent *de = (dirent *)NULL;    // just to silence compiler warnings
 123     bool matches = false;
 124
 125     // speed up string concatenation in the loop a bit
 126     wxString path = m_dirname;
 127     path += _T('/');
 128     path.reserve(path.length() + 255);
 129
 130     wxString de_d_name;
 131
 132     while ( !matches )
 133     {
 134         de = readdir(m_dir);
 135         if ( !de )
 136             return false;
 137
 138 #if wxUSE_UNICODE
 139         de_d_name = wxConvFileName->cMB2WC( de->d_name );
 140 #else
 141         de_d_name = de->d_name;
 142 #endif
 143
 144         // don't return "." and ".." unless asked for
 145         if ( de->d_name[0] == '.' &&
 146              ((de->d_name[1] == '.' && de->d_name[2] == '\0') ||
 147               (de->d_name[1] == '\0')) )
 148         {
 149             if ( !(m_flags & wxDIR_DOTDOT) )
 150                 continue;
 151
 152             // we found a valid match
 153             break;
 154         }
 155
 156         // check the type now
 157         if ( !(m_flags & wxDIR_FILES) && !wxDir::Exists(path + de_d_name) )
 158         {
 159             // it's a file, but we don't want them
 160             continue;
 161         }
 162         else if ( !(m_flags & wxDIR_DIRS) && wxDir::Exists(path + de_d_name) )
 163         {
 164             // it's a dir, and we don't want it
 165             continue;
 166         }
 167
 168         // finally, check the name
 169         if ( m_filespec.empty() )
 170         {
 171             matches = m_flags & wxDIR_HIDDEN ? true : de->d_name[0] != '.';
 172         }
 173         else
 174         {
 175             // test against the pattern
 176             matches = wxMatchWild(m_filespec, de_d_name,
 177                                   !(m_flags & wxDIR_HIDDEN));
 178         }
 179     }
 180
 181     *filename = de_d_name;
 182
 183     return true;
 184 }
 185
 186 #else // old VMS (TODO)
 187
 188 wxDirData::wxDirData(const wxString& WXUNUSED(dirname))
 189 {
 190     wxFAIL_MSG(_T("not implemented"));
 191 }
 192
 193 wxDirData::~wxDirData()
 194 {
 195 }
 196
 197 bool wxDirData::Read(wxString * WXUNUSED(filename))
 198 {
 199     return false;
 200 }
 201
 202 #endif // not or new VMS/old VMS
 203
 204 // ----------------------------------------------------------------------------
 205 // wxDir helpers
 206 // ----------------------------------------------------------------------------
 207
 208 /* static */
 209 bool wxDir::Exists(const wxString& dir)
 210 {
 211     return wxDirExists(dir);
 212 }
 213
 214 // ----------------------------------------------------------------------------
 215 // wxDir construction/destruction
 216 // ----------------------------------------------------------------------------
 217
 218 wxDir::wxDir(const wxString& dirname)
 219 {
 220     m_data = NULL;
 221
 222     (void)Open(dirname);
 223 }
 224
 225 bool wxDir::Open(const wxString& dirname)
 226 {
 227     delete M_DIR;
 228     m_data = new wxDirData(dirname);
 229
 230     if ( !M_DIR->IsOk() )
 231     {
 232         wxLogSysError(_("Can not enumerate files in directory '%s'"),
 233                       dirname.c_str());
 234
 235         delete M_DIR;
 236         m_data = NULL;
 237
 238         return false;
 239     }
 240
 241     return true;
 242 }
 243
 244 bool wxDir::IsOpened() const
 245 {
 246     return m_data != NULL;
 247 }
 248
 249 wxString wxDir::GetName() const
 250 {
 251     wxString name;
 252     if ( m_data )
 253     {
 254         name = M_DIR->GetName();
 255         if ( !name.empty() && (name.Last() == _T('/')) )
 256         {
 257             // chop off the last (back)slash
 258             name.Truncate(name.length() - 1);
 259         }
 260     }
 261
 262     return name;
 263 }
 264
 265 wxDir::~wxDir()
 266 {
 267     delete M_DIR;
 268 }
 269
 270 // ----------------------------------------------------------------------------
 271 // wxDir enumerating
 272 // ----------------------------------------------------------------------------
 273
 274 bool wxDir::GetFirst(wxString *filename,
 275                      const wxString& filespec,
 276                      int flags) const
 277 {
 278     wxCHECK_MSG( IsOpened(), false, _T("must wxDir::Open() first") );
 279
 280     M_DIR->Rewind();
 281
 282     M_DIR->SetFileSpec(filespec);
 283     M_DIR->SetFlags(flags);
 284
 285     return GetNext(filename);
 286 }
 287
 288 bool wxDir::GetNext(wxString *filename) const
 289 {
 290     wxCHECK_MSG( IsOpened(), false, _T("must wxDir::Open() first") );
 291
 292     wxCHECK_MSG( filename, false, _T("bad pointer in wxDir::GetNext()") );
 293
 294     return M_DIR->Read(filename);
 295 }
 296
 297 bool wxDir::HasSubDirs(const wxString& spec)
 298 {
 299     wxCHECK_MSG( IsOpened(), false, _T("must wxDir::Open() first") );
 300
 301     if ( spec.empty() )
 302     {
 303         // faster check for presence of any subdirectory: normally each subdir
 304         // has a hard link to the parent directory and so, knowing that there
 305         // are at least "." and "..", we have a subdirectory if and only if
 306         // links number is > 2 - this is just a guess but it works fairly well
 307         // in practice
 308         //
 309         // note that we may guess wrongly in one direction only: i.e. we may
 310         // return true when there are no subdirectories but this is ok as the
 311         // caller will learn it soon enough when it calls GetFirst(wxDIR)
 312         // anyhow
 313         wxStructStat stBuf;
 314         if ( wxStat(M_DIR->GetName().c_str(), &stBuf) == 0 )
 315         {
 316             switch ( stBuf.st_nlink )
 317             {
 318                 case 2:
 319                     // just "." and ".."
 320                     return false;
 321
 322                 case 0:
 323                 case 1:
 324                     // weird filesystem, don't try to guess for it, use dumb
 325                     // method below
 326                     break;
 327
 328                 default:
 329                     // assume we have subdirs - may turn out to be wrong if we
 330                     // have other hard links to this directory but it's not
 331                     // that bad as explained above
 332                     return true;
 333             }
 334         }
 335     }
 336
 337     // just try to find first directory
 338     wxString s;
 339     return GetFirst(&s, spec, wxDIR_DIRS | wxDIR_HIDDEN);
 340 }
 341