Diff: drivers/FileSystemLike.cpp

Revision:

0:f269e3021894

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/drivers/FileSystemLike.cpp	Sun Oct 23 15:10:02 2016 +0000
@@ -0,0 +1,101 @@
+/* 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.
+ */
+#include "drivers/FileSystemLike.h"
+
+namespace mbed {
+
+class BaseDirHandle : public DirHandle {
+public:
+    /*
+      We keep track of our current location as the n'th object in the
+      FileSystemLike list. Using a Base* instead would cause problems if that
+      object were to be destroyed between readdirs.
+      Using this method does mean though that destroying/creating objects can
+      give unusual results from readdir.
+    */
+    off_t n;
+    struct dirent cur_entry;
+
+    BaseDirHandle() : n(0), cur_entry() {
+    }
+
+    virtual int closedir() {
+        // No lock can be used in destructor
+        delete this;
+        return 0;
+    }
+
+    virtual struct dirent *readdir() {
+        lock();
+        FileBase *ptr = FileBase::get(n);
+        if (ptr == NULL) {
+            unlock();
+            return NULL;
+        }
+
+        /* Increment n, so next readdir gets the next item */
+        n++;
+
+        /* Setup cur entry and return a pointer to it */
+        std::strncpy(cur_entry.d_name, ptr->getName(), NAME_MAX);
+        unlock();
+        return &cur_entry;
+    }
+
+    virtual off_t telldir() {
+        lock();
+        off_t offset = n;
+        unlock();
+        return offset;
+    }
+
+    virtual void seekdir(off_t offset) {
+        lock();
+        n = offset;
+        unlock();
+    }
+
+    virtual void rewinddir() {
+        lock();
+        n = 0;
+        unlock();
+    }
+
+protected:
+    PlatformMutex _mutex;
+
+    virtual void lock() {
+        _mutex.lock();
+    }
+
+    virtual void unlock() {
+        _mutex.unlock();
+    }
+};
+
+FileSystemLike::FileSystemLike(const char *name) : FileBase(name, FileSystemPathType) {
+
+}
+
+FileSystemLike::~FileSystemLike() {
+
+}
+
+DirHandle *FileSystemLike::opendir() {
+    return new BaseDirHandle();
+}
+
+} // namespace mbed