mirror of https://github.com/ARMmbed/mbed-os.git
102 lines
2.4 KiB
C++
102 lines
2.4 KiB
C++
/* mbed Microcontroller Library
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* Copyright (c) 2006-2013 ARM Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "drivers/FileSystemLike.h"
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namespace mbed {
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class BaseDirHandle : public DirHandle {
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public:
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/*
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We keep track of our current location as the n'th object in the
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FileSystemLike list. Using a Base* instead would cause problems if that
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object were to be destroyed between readdirs.
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Using this method does mean though that destroying/creating objects can
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give unusual results from readdir.
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*/
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off_t n;
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struct dirent cur_entry;
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BaseDirHandle() : DirHandle(0), n(0), cur_entry() {
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}
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virtual int closedir() {
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// No lock can be used in destructor
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delete this;
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return 0;
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}
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virtual struct dirent *readdir() {
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lock();
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FileBase *ptr = FileBase::get(n);
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if (ptr == NULL) {
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unlock();
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return NULL;
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}
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/* Increment n, so next readdir gets the next item */
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n++;
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/* Setup cur entry and return a pointer to it */
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std::strncpy(cur_entry.d_name, ptr->getName(), NAME_MAX);
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unlock();
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return &cur_entry;
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}
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virtual off_t telldir() {
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lock();
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off_t offset = n;
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unlock();
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return offset;
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}
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virtual void seekdir(off_t offset) {
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lock();
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n = offset;
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unlock();
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}
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virtual void rewinddir() {
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lock();
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n = 0;
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unlock();
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}
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protected:
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PlatformMutex _mutex;
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virtual void lock() {
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_mutex.lock();
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}
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virtual void unlock() {
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_mutex.unlock();
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}
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};
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FileSystemLike::FileSystemLike(const char *name) : FileBase(name, FileSystemPathType) {
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}
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FileSystemLike::~FileSystemLike() {
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}
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DirHandle *FileSystemLike::opendir() {
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return new BaseDirHandle();
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}
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} // namespace mbed
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