Diff: drivers/DirHandle.h

Revision:

149:156823d33999

diff -r 21d94c44109e -r 156823d33999 drivers/DirHandle.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/drivers/DirHandle.h	Fri Oct 28 11:17:30 2016 +0100
@@ -0,0 +1,124 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef MBED_DIRHANDLE_H
+#define MBED_DIRHANDLE_H
+
+#if defined(__ARMCC_VERSION) || defined(__ICCARM__)
+#   define NAME_MAX 255
+typedef int mode_t;
+
+#else
+#   include <sys/syslimits.h>
+#endif
+
+#include "FileHandle.h"
+
+struct dirent {
+    char d_name[NAME_MAX+1];
+};
+
+namespace mbed {
+/** \addtogroup drivers */
+/** @{*/
+
+/** Represents a directory stream. Objects of this type are returned
+ *  by a FileSystemLike's opendir method. Implementations must define
+ *  at least closedir, readdir and rewinddir.
+ *
+ *  If a FileSystemLike class defines the opendir method, then the
+ *  directories of an object of that type can be accessed by
+ *  DIR *d = opendir("/example/directory") (or opendir("/example")
+ *  to open the root of the filesystem), and then using readdir(d) etc.
+ *
+ *  The root directory is considered to contain all FileLike and
+ *  FileSystemLike objects, so the DIR* returned by opendir("/") will
+ *  reflect this.
+ *
+ *  @Note Synchronization level: Set by subclass
+ */
+class DirHandle {
+
+public:
+    /** Closes the directory.
+     *
+     *  @returns
+     *    0 on success,
+     *   -1 on error.
+     */
+    virtual int closedir()=0;
+
+    /** Return the directory entry at the current position, and
+     *  advances the position to the next entry.
+     *
+     * @returns
+     *  A pointer to a dirent structure representing the
+     *  directory entry at the current position, or NULL on reaching
+     *  end of directory or error.
+     */
+    virtual struct dirent *readdir()=0;
+
+    /** Resets the position to the beginning of the directory.
+     */
+    virtual void rewinddir()=0;
+
+    /** Returns the current position of the DirHandle.
+     *
+     * @returns
+     *   the current position,
+     *  -1 on error.
+     */
+    virtual off_t telldir() { return -1; }
+
+    /** Sets the position of the DirHandle.
+     *
+     *  @param location The location to seek to. Must be a value returned by telldir.
+     */
+    virtual void seekdir(off_t location) { (void)location;}
+
+    virtual ~DirHandle() {}
+
+protected:
+
+    /** Acquire exclusive access to this object.
+     */
+    virtual void lock() {
+        // Stub
+    }
+
+    /** Release exclusive access to this object.
+     */
+    virtual void unlock() {
+        // Stub
+    }
+};
+
+} // namespace mbed
+
+typedef mbed::DirHandle DIR;
+
+extern "C" {
+    DIR *opendir(const char*);
+    struct dirent *readdir(DIR *);
+    int closedir(DIR*);
+    void rewinddir(DIR*);
+    long telldir(DIR*);
+    void seekdir(DIR*, long);
+    int mkdir(const char *name, mode_t n);
+};
+
+#endif /* MBED_DIRHANDLE_H */
+
+/** @}*/