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Diff: drivers/FileSystemLike.cpp
- Revision:
- 149:156823d33999
- Child:
- 160:d5399cc887bb
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/drivers/FileSystemLike.cpp Fri Oct 28 11:17:30 2016 +0100 @@ -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