Vipin Ranka / MGAS_GR_Peach

This is the final version of Mini Gateway for Automation and Security desgined for Renesas GR Peach Design Contest

Dependencies:   GR-PEACH_video GraphicsFramework HTTPServer R_BSP mbed-rpc mbed-rtos Socket lwip-eth lwip-sys lwip FATFileSystem

Fork of mbed-os-example-mbed5-blinky by mbed-os-examples

mbed-dev/drivers/FileSystemLike.cpp@12:9a20164dcc47, 2017-01-11 (annotated)

Committer:
vipinranka
Date:
Wed Jan 11 11:41:30 2017 +0000
Revision:
12:9a20164dcc47
This is the final version MGAS Project for Renesas GR Peach Design Contest

Who changed what in which revision?

UserRevisionLine numberNew contents of line
vipinranka 12:9a20164dcc47 1 /* mbed Microcontroller Library
vipinranka 12:9a20164dcc47 2 * Copyright (c) 2006-2013 ARM Limited
vipinranka 12:9a20164dcc47 3 *
vipinranka 12:9a20164dcc47 4 * Licensed under the Apache License, Version 2.0 (the "License");
vipinranka 12:9a20164dcc47 5 * you may not use this file except in compliance with the License.
vipinranka 12:9a20164dcc47 6 * You may obtain a copy of the License at
vipinranka 12:9a20164dcc47 7 *
vipinranka 12:9a20164dcc47 8 * http://www.apache.org/licenses/LICENSE-2.0
vipinranka 12:9a20164dcc47 9 *
vipinranka 12:9a20164dcc47 10 * Unless required by applicable law or agreed to in writing, software
vipinranka 12:9a20164dcc47 11 * distributed under the License is distributed on an "AS IS" BASIS,
vipinranka 12:9a20164dcc47 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
vipinranka 12:9a20164dcc47 13 * See the License for the specific language governing permissions and
vipinranka 12:9a20164dcc47 14 * limitations under the License.
vipinranka 12:9a20164dcc47 15 */
vipinranka 12:9a20164dcc47 16 #include "drivers/FileSystemLike.h"
vipinranka 12:9a20164dcc47 17
vipinranka 12:9a20164dcc47 18 namespace mbed {
vipinranka 12:9a20164dcc47 19
vipinranka 12:9a20164dcc47 20 class BaseDirHandle : public DirHandle {
vipinranka 12:9a20164dcc47 21 public:
vipinranka 12:9a20164dcc47 22 /*
vipinranka 12:9a20164dcc47 23 We keep track of our current location as the n'th object in the
vipinranka 12:9a20164dcc47 24 FileSystemLike list. Using a Base* instead would cause problems if that
vipinranka 12:9a20164dcc47 25 object were to be destroyed between readdirs.
vipinranka 12:9a20164dcc47 26 Using this method does mean though that destroying/creating objects can
vipinranka 12:9a20164dcc47 27 give unusual results from readdir.
vipinranka 12:9a20164dcc47 28 */
vipinranka 12:9a20164dcc47 29 off_t n;
vipinranka 12:9a20164dcc47 30 struct dirent cur_entry;
vipinranka 12:9a20164dcc47 31
vipinranka 12:9a20164dcc47 32 BaseDirHandle() : n(0), cur_entry() {
vipinranka 12:9a20164dcc47 33 }
vipinranka 12:9a20164dcc47 34
vipinranka 12:9a20164dcc47 35 virtual int closedir() {
vipinranka 12:9a20164dcc47 36 // No lock can be used in destructor
vipinranka 12:9a20164dcc47 37 delete this;
vipinranka 12:9a20164dcc47 38 return 0;
vipinranka 12:9a20164dcc47 39 }
vipinranka 12:9a20164dcc47 40
vipinranka 12:9a20164dcc47 41 virtual struct dirent *readdir() {
vipinranka 12:9a20164dcc47 42 lock();
vipinranka 12:9a20164dcc47 43 FileBase *ptr = FileBase::get(n);
vipinranka 12:9a20164dcc47 44 if (ptr == NULL) {
vipinranka 12:9a20164dcc47 45 unlock();
vipinranka 12:9a20164dcc47 46 return NULL;
vipinranka 12:9a20164dcc47 47 }
vipinranka 12:9a20164dcc47 48
vipinranka 12:9a20164dcc47 49 /* Increment n, so next readdir gets the next item */
vipinranka 12:9a20164dcc47 50 n++;
vipinranka 12:9a20164dcc47 51
vipinranka 12:9a20164dcc47 52 /* Setup cur entry and return a pointer to it */
vipinranka 12:9a20164dcc47 53 std::strncpy(cur_entry.d_name, ptr->getName(), NAME_MAX);
vipinranka 12:9a20164dcc47 54 unlock();
vipinranka 12:9a20164dcc47 55 return &cur_entry;
vipinranka 12:9a20164dcc47 56 }
vipinranka 12:9a20164dcc47 57
vipinranka 12:9a20164dcc47 58 virtual off_t telldir() {
vipinranka 12:9a20164dcc47 59 lock();
vipinranka 12:9a20164dcc47 60 off_t offset = n;
vipinranka 12:9a20164dcc47 61 unlock();
vipinranka 12:9a20164dcc47 62 return offset;
vipinranka 12:9a20164dcc47 63 }
vipinranka 12:9a20164dcc47 64
vipinranka 12:9a20164dcc47 65 virtual void seekdir(off_t offset) {
vipinranka 12:9a20164dcc47 66 lock();
vipinranka 12:9a20164dcc47 67 n = offset;
vipinranka 12:9a20164dcc47 68 unlock();
vipinranka 12:9a20164dcc47 69 }
vipinranka 12:9a20164dcc47 70
vipinranka 12:9a20164dcc47 71 virtual void rewinddir() {
vipinranka 12:9a20164dcc47 72 lock();
vipinranka 12:9a20164dcc47 73 n = 0;
vipinranka 12:9a20164dcc47 74 unlock();
vipinranka 12:9a20164dcc47 75 }
vipinranka 12:9a20164dcc47 76
vipinranka 12:9a20164dcc47 77 protected:
vipinranka 12:9a20164dcc47 78 PlatformMutex _mutex;
vipinranka 12:9a20164dcc47 79
vipinranka 12:9a20164dcc47 80 virtual void lock() {
vipinranka 12:9a20164dcc47 81 _mutex.lock();
vipinranka 12:9a20164dcc47 82 }
vipinranka 12:9a20164dcc47 83
vipinranka 12:9a20164dcc47 84 virtual void unlock() {
vipinranka 12:9a20164dcc47 85 _mutex.unlock();
vipinranka 12:9a20164dcc47 86 }
vipinranka 12:9a20164dcc47 87 };
vipinranka 12:9a20164dcc47 88
vipinranka 12:9a20164dcc47 89 FileSystemLike::FileSystemLike(const char *name) : FileBase(name, FileSystemPathType) {
vipinranka 12:9a20164dcc47 90
vipinranka 12:9a20164dcc47 91 }
vipinranka 12:9a20164dcc47 92
vipinranka 12:9a20164dcc47 93 FileSystemLike::~FileSystemLike() {
vipinranka 12:9a20164dcc47 94
vipinranka 12:9a20164dcc47 95 }
vipinranka 12:9a20164dcc47 96
vipinranka 12:9a20164dcc47 97 DirHandle *FileSystemLike::opendir() {
vipinranka 12:9a20164dcc47 98 return new BaseDirHandle();
vipinranka 12:9a20164dcc47 99 }
vipinranka 12:9a20164dcc47 100
vipinranka 12:9a20164dcc47 101 } // namespace mbed