3 * This file has no copyright assigned and is placed in the Public Domain.
4 * This file is a part of the mingw-runtime package.
5 * No warranty is given; refer to the file DISCLAIMER within the package.
7 * Derived from DIRLIB.C by Matt J. Weinstein
8 * This note appears in the DIRLIB.H
9 * DIRLIB.H by M. J. Weinstein Released to public domain 1-Jan-89
11 * Updated by Jeremy Bettis <jeremy@hksys.com>
12 * Significantly revised and rewinddir, seekdir and telldir added by Colin
13 * Peters <colin@fu.is.saga-u.ac.jp>
24 #define WIN32_LEAN_AND_MEAN
25 #include <windows.h> /* for GetFileAttributes */
28 #define SUFFIX _T("*")
29 #define SLASH _T("\\")
32 /* Helper for opendir(). */
33 static inline unsigned _tGetFileAttributes (const _TCHAR * tPath)
36 /* GetFileAttributesW does not work on W9x, so convert to ANSI */
39 char aPath [MAX_PATH];
40 WideCharToMultiByte (CP_ACP, 0, tPath, -1, aPath, MAX_PATH, NULL,
42 return GetFileAttributesA (aPath);
44 return GetFileAttributesW (tPath);
46 return GetFileAttributesA (tPath);
53 * Returns a pointer to a DIR structure appropriately filled in to begin
54 * searching a directory.
57 _topendir (const _TCHAR *szPath)
61 _TCHAR szFullPath[MAX_PATH];
71 if (szPath[0] == _T('\0'))
77 /* Attempt to determine if the given path really is a directory. */
78 rc = _tGetFileAttributes (szPath);
79 if (rc == (unsigned int)-1)
81 /* call GetLastError for more error info */
85 if (!(rc & FILE_ATTRIBUTE_DIRECTORY))
87 /* Error, entry exists but not a directory. */
92 /* Make an absolute pathname. */
93 _tfullpath (szFullPath, szPath, MAX_PATH);
95 /* Allocate enough space to store DIR structure and the complete
96 * directory path given. */
97 nd = (_TDIR *) malloc (sizeof (_TDIR) + (_tcslen (szFullPath)
99 + _tcslen (SUFFIX) + 1)
104 /* Error, out of memory. */
109 /* Create the search expression. */
110 _tcscpy (nd->dd_name, szFullPath);
112 /* Add on a slash if the path does not end with one. */
113 if (nd->dd_name[0] != _T('\0')
114 && _tcsrchr (nd->dd_name, _T('/')) != nd->dd_name
115 + _tcslen (nd->dd_name) - 1
116 && _tcsrchr (nd->dd_name, _T('\\')) != nd->dd_name
117 + _tcslen (nd->dd_name) - 1)
119 _tcscat (nd->dd_name, SLASH);
122 /* Add on the search pattern */
123 _tcscat (nd->dd_name, SUFFIX);
125 /* Initialize handle to -1 so that a premature closedir doesn't try
126 * to call _findclose on it. */
129 /* Initialize the status. */
132 /* Initialize the dirent structure. ino and reclen are invalid under
133 * Win32, and name simply points at the appropriate part of the
134 * findfirst_t structure. */
135 nd->dd_dir.d_ino = 0;
136 nd->dd_dir.d_reclen = 0;
137 nd->dd_dir.d_namlen = 0;
138 memset (nd->dd_dir.d_name, 0, FILENAME_MAX);
147 * Return a pointer to a dirent structure filled with the information on the
148 * next entry in the directory.
151 _treaddir (_TDIR * dirp)
155 /* Check for valid DIR struct. */
159 return (struct _tdirent *) 0;
162 if (dirp->dd_stat < 0)
164 /* We have already returned all files in the directory
165 * (or the structure has an invalid dd_stat). */
166 return (struct _tdirent *) 0;
168 else if (dirp->dd_stat == 0)
170 /* We haven't started the search yet. */
171 /* Start the search */
172 dirp->dd_handle = _tfindfirst (dirp->dd_name, &(dirp->dd_dta));
174 if (dirp->dd_handle == -1)
176 /* Whoops! Seems there are no files in that
187 /* Get the next search entry. */
188 if (_tfindnext (dirp->dd_handle, &(dirp->dd_dta)))
190 /* We are off the end or otherwise error.
191 _findnext sets errno to ENOENT if no more file
193 DWORD winerr = GetLastError ();
194 if (winerr == ERROR_NO_MORE_FILES)
196 _findclose (dirp->dd_handle);
197 dirp->dd_handle = -1;
202 /* Update the status to indicate the correct
208 if (dirp->dd_stat > 0)
210 /* Successfully got an entry. Everything about the file is
211 * already appropriately filled in except the length of the
213 dirp->dd_dir.d_namlen = _tcslen (dirp->dd_dta.name);
214 _tcscpy (dirp->dd_dir.d_name, dirp->dd_dta.name);
215 return &dirp->dd_dir;
218 return (struct _tdirent *) 0;
225 * Frees up resources allocated by opendir.
228 _tclosedir (_TDIR * dirp)
241 if (dirp->dd_handle != -1)
243 rc = _findclose (dirp->dd_handle);
246 /* Delete the dir structure. */
255 * Return to the beginning of the directory "stream". We simply call findclose
256 * and then reset things like an opendir.
259 _trewinddir (_TDIR * dirp)
269 if (dirp->dd_handle != -1)
271 _findclose (dirp->dd_handle);
274 dirp->dd_handle = -1;
281 * Returns the "position" in the "directory stream" which can be used with
282 * seekdir to go back to an old entry. We simply return the value in stat.
285 _ttelldir (_TDIR * dirp)
294 return dirp->dd_stat;
300 * Seek to an entry previously returned by telldir. We rewind the directory
301 * and call readdir repeatedly until either dd_stat is the position number
302 * or -1 (off the end). This is not perfect, in that the directory may
303 * have changed while we weren't looking. But that is probably the case with
307 _tseekdir (_TDIR * dirp, long lPos)
319 /* Seeking to an invalid position. */
326 if (dirp->dd_handle != -1)
328 _findclose (dirp->dd_handle);
330 dirp->dd_handle = -1;
335 /* Rewind and read forward to the appropriate index. */
338 while ((dirp->dd_stat < lPos) && _treaddir (dirp))