Iftikhar Aziz / mbed-dev

4545

Dependents:   LSS_Rev_1

Fork of mbed-dev by Umar Naeem

drivers/FileSystemLike.cpp@166:33361e55dd8c, 2017-08-23 (annotated)

Committer:
iftaziz
Date:
Wed Aug 23 10:32:38 2017 +0000
Revision:
166:33361e55dd8c
Parent:
160:d5399cc887bb 
r1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 149:156823d33999 1 /* mbed Microcontroller Library
<> 149:156823d33999 2 * Copyright (c) 2006-2013 ARM Limited
<> 149:156823d33999 3 *
<> 149:156823d33999 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 149:156823d33999 5 * you may not use this file except in compliance with the License.
<> 149:156823d33999 6 * You may obtain a copy of the License at
<> 149:156823d33999 7 *
<> 149:156823d33999 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 149:156823d33999 9 *
<> 149:156823d33999 10 * Unless required by applicable law or agreed to in writing, software
<> 149:156823d33999 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 149:156823d33999 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 149:156823d33999 13 * See the License for the specific language governing permissions and
<> 149:156823d33999 14 * limitations under the License.
<> 149:156823d33999 15 */
<> 149:156823d33999 16 #include "drivers/FileSystemLike.h"
<> 149:156823d33999 17
<> 149:156823d33999 18 namespace mbed {
<> 149:156823d33999 19
<> 149:156823d33999 20 class BaseDirHandle : public DirHandle {
<> 149:156823d33999 21 public:
<> 149:156823d33999 22 /*
<> 149:156823d33999 23 We keep track of our current location as the n'th object in the
<> 149:156823d33999 24 FileSystemLike list. Using a Base* instead would cause problems if that
<> 149:156823d33999 25 object were to be destroyed between readdirs.
<> 149:156823d33999 26 Using this method does mean though that destroying/creating objects can
<> 149:156823d33999 27 give unusual results from readdir.
<> 149:156823d33999 28 */
<> 149:156823d33999 29 off_t n;
<> 149:156823d33999 30 struct dirent cur_entry;
<> 149:156823d33999 31
<> 160:d5399cc887bb 32 BaseDirHandle() : DirHandle(0), n(0), cur_entry() {
<> 149:156823d33999 33 }
<> 149:156823d33999 34
<> 149:156823d33999 35 virtual int closedir() {
<> 149:156823d33999 36 // No lock can be used in destructor
<> 149:156823d33999 37 delete this;
<> 149:156823d33999 38 return 0;
<> 149:156823d33999 39 }
<> 149:156823d33999 40
<> 149:156823d33999 41 virtual struct dirent *readdir() {
<> 149:156823d33999 42 lock();
<> 149:156823d33999 43 FileBase *ptr = FileBase::get(n);
<> 149:156823d33999 44 if (ptr == NULL) {
<> 149:156823d33999 45 unlock();
<> 149:156823d33999 46 return NULL;
<> 149:156823d33999 47 }
<> 149:156823d33999 48
<> 149:156823d33999 49 /* Increment n, so next readdir gets the next item */
<> 149:156823d33999 50 n++;
<> 149:156823d33999 51
<> 149:156823d33999 52 /* Setup cur entry and return a pointer to it */
<> 149:156823d33999 53 std::strncpy(cur_entry.d_name, ptr->getName(), NAME_MAX);
<> 149:156823d33999 54 unlock();
<> 149:156823d33999 55 return &cur_entry;
<> 149:156823d33999 56 }
<> 149:156823d33999 57
<> 149:156823d33999 58 virtual off_t telldir() {
<> 149:156823d33999 59 lock();
<> 149:156823d33999 60 off_t offset = n;
<> 149:156823d33999 61 unlock();
<> 149:156823d33999 62 return offset;
<> 149:156823d33999 63 }
<> 149:156823d33999 64
<> 149:156823d33999 65 virtual void seekdir(off_t offset) {
<> 149:156823d33999 66 lock();
<> 149:156823d33999 67 n = offset;
<> 149:156823d33999 68 unlock();
<> 149:156823d33999 69 }
<> 149:156823d33999 70
<> 149:156823d33999 71 virtual void rewinddir() {
<> 149:156823d33999 72 lock();
<> 149:156823d33999 73 n = 0;
<> 149:156823d33999 74 unlock();
<> 149:156823d33999 75 }
<> 149:156823d33999 76
<> 149:156823d33999 77 protected:
<> 149:156823d33999 78 PlatformMutex _mutex;
<> 149:156823d33999 79
<> 149:156823d33999 80 virtual void lock() {
<> 149:156823d33999 81 _mutex.lock();
<> 149:156823d33999 82 }
<> 149:156823d33999 83
<> 149:156823d33999 84 virtual void unlock() {
<> 149:156823d33999 85 _mutex.unlock();
<> 149:156823d33999 86 }
<> 149:156823d33999 87 };
<> 149:156823d33999 88
<> 149:156823d33999 89 FileSystemLike::FileSystemLike(const char *name) : FileBase(name, FileSystemPathType) {
<> 149:156823d33999 90
<> 149:156823d33999 91 }
<> 149:156823d33999 92
<> 149:156823d33999 93 FileSystemLike::~FileSystemLike() {
<> 149:156823d33999 94
<> 149:156823d33999 95 }
<> 149:156823d33999 96
<> 149:156823d33999 97 DirHandle *FileSystemLike::opendir() {
<> 149:156823d33999 98 return new BaseDirHandle();
<> 149:156823d33999 99 }
<> 149:156823d33999 100
<> 149:156823d33999 101 } // namespace mbed