Mateusz Kowalik / Application

USB Serial application

Fork of USBSerial_HelloWorld by Samuel Mokrani

mbed-dev/drivers/FileSystemLike.cpp@10:41552d038a69, 2017-01-10 (annotated)

Committer:
Zaitsev
Date:
Tue Jan 10 20:42:26 2017 +0000
Revision:
10:41552d038a69
USB Serial bi-directional bridge

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Zaitsev 10:41552d038a69 1 /* mbed Microcontroller Library
Zaitsev 10:41552d038a69 2 * Copyright (c) 2006-2013 ARM Limited
Zaitsev 10:41552d038a69 3 *
Zaitsev 10:41552d038a69 4 * Licensed under the Apache License, Version 2.0 (the "License");
Zaitsev 10:41552d038a69 5 * you may not use this file except in compliance with the License.
Zaitsev 10:41552d038a69 6 * You may obtain a copy of the License at
Zaitsev 10:41552d038a69 7 *
Zaitsev 10:41552d038a69 8 * http://www.apache.org/licenses/LICENSE-2.0
Zaitsev 10:41552d038a69 9 *
Zaitsev 10:41552d038a69 10 * Unless required by applicable law or agreed to in writing, software
Zaitsev 10:41552d038a69 11 * distributed under the License is distributed on an "AS IS" BASIS,
Zaitsev 10:41552d038a69 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
Zaitsev 10:41552d038a69 13 * See the License for the specific language governing permissions and
Zaitsev 10:41552d038a69 14 * limitations under the License.
Zaitsev 10:41552d038a69 15 */
Zaitsev 10:41552d038a69 16 #include "drivers/FileSystemLike.h"
Zaitsev 10:41552d038a69 17
Zaitsev 10:41552d038a69 18 namespace mbed {
Zaitsev 10:41552d038a69 19
Zaitsev 10:41552d038a69 20 class BaseDirHandle : public DirHandle {
Zaitsev 10:41552d038a69 21 public:
Zaitsev 10:41552d038a69 22 /*
Zaitsev 10:41552d038a69 23 We keep track of our current location as the n'th object in the
Zaitsev 10:41552d038a69 24 FileSystemLike list. Using a Base* instead would cause problems if that
Zaitsev 10:41552d038a69 25 object were to be destroyed between readdirs.
Zaitsev 10:41552d038a69 26 Using this method does mean though that destroying/creating objects can
Zaitsev 10:41552d038a69 27 give unusual results from readdir.
Zaitsev 10:41552d038a69 28 */
Zaitsev 10:41552d038a69 29 off_t n;
Zaitsev 10:41552d038a69 30 struct dirent cur_entry;
Zaitsev 10:41552d038a69 31
Zaitsev 10:41552d038a69 32 BaseDirHandle() : n(0), cur_entry() {
Zaitsev 10:41552d038a69 33 }
Zaitsev 10:41552d038a69 34
Zaitsev 10:41552d038a69 35 virtual int closedir() {
Zaitsev 10:41552d038a69 36 // No lock can be used in destructor
Zaitsev 10:41552d038a69 37 delete this;
Zaitsev 10:41552d038a69 38 return 0;
Zaitsev 10:41552d038a69 39 }
Zaitsev 10:41552d038a69 40
Zaitsev 10:41552d038a69 41 virtual struct dirent *readdir() {
Zaitsev 10:41552d038a69 42 lock();
Zaitsev 10:41552d038a69 43 FileBase *ptr = FileBase::get(n);
Zaitsev 10:41552d038a69 44 if (ptr == NULL) {
Zaitsev 10:41552d038a69 45 unlock();
Zaitsev 10:41552d038a69 46 return NULL;
Zaitsev 10:41552d038a69 47 }
Zaitsev 10:41552d038a69 48
Zaitsev 10:41552d038a69 49 /* Increment n, so next readdir gets the next item */
Zaitsev 10:41552d038a69 50 n++;
Zaitsev 10:41552d038a69 51
Zaitsev 10:41552d038a69 52 /* Setup cur entry and return a pointer to it */
Zaitsev 10:41552d038a69 53 std::strncpy(cur_entry.d_name, ptr->getName(), NAME_MAX);
Zaitsev 10:41552d038a69 54 unlock();
Zaitsev 10:41552d038a69 55 return &cur_entry;
Zaitsev 10:41552d038a69 56 }
Zaitsev 10:41552d038a69 57
Zaitsev 10:41552d038a69 58 virtual off_t telldir() {
Zaitsev 10:41552d038a69 59 lock();
Zaitsev 10:41552d038a69 60 off_t offset = n;
Zaitsev 10:41552d038a69 61 unlock();
Zaitsev 10:41552d038a69 62 return offset;
Zaitsev 10:41552d038a69 63 }
Zaitsev 10:41552d038a69 64
Zaitsev 10:41552d038a69 65 virtual void seekdir(off_t offset) {
Zaitsev 10:41552d038a69 66 lock();
Zaitsev 10:41552d038a69 67 n = offset;
Zaitsev 10:41552d038a69 68 unlock();
Zaitsev 10:41552d038a69 69 }
Zaitsev 10:41552d038a69 70
Zaitsev 10:41552d038a69 71 virtual void rewinddir() {
Zaitsev 10:41552d038a69 72 lock();
Zaitsev 10:41552d038a69 73 n = 0;
Zaitsev 10:41552d038a69 74 unlock();
Zaitsev 10:41552d038a69 75 }
Zaitsev 10:41552d038a69 76
Zaitsev 10:41552d038a69 77 protected:
Zaitsev 10:41552d038a69 78 PlatformMutex _mutex;
Zaitsev 10:41552d038a69 79
Zaitsev 10:41552d038a69 80 virtual void lock() {
Zaitsev 10:41552d038a69 81 _mutex.lock();
Zaitsev 10:41552d038a69 82 }
Zaitsev 10:41552d038a69 83
Zaitsev 10:41552d038a69 84 virtual void unlock() {
Zaitsev 10:41552d038a69 85 _mutex.unlock();
Zaitsev 10:41552d038a69 86 }
Zaitsev 10:41552d038a69 87 };
Zaitsev 10:41552d038a69 88
Zaitsev 10:41552d038a69 89 FileSystemLike::FileSystemLike(const char *name) : FileBase(name, FileSystemPathType) {
Zaitsev 10:41552d038a69 90
Zaitsev 10:41552d038a69 91 }
Zaitsev 10:41552d038a69 92
Zaitsev 10:41552d038a69 93 FileSystemLike::~FileSystemLike() {
Zaitsev 10:41552d038a69 94
Zaitsev 10:41552d038a69 95 }
Zaitsev 10:41552d038a69 96
Zaitsev 10:41552d038a69 97 DirHandle *FileSystemLike::opendir() {
Zaitsev 10:41552d038a69 98 return new BaseDirHandle();
Zaitsev 10:41552d038a69 99 }
Zaitsev 10:41552d038a69 100
Zaitsev 10:41552d038a69 101 } // namespace mbed