joey shelton / LED_Demo2

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Dependencies:   MAX44000 PWM_Tone_Library nexpaq_mdk

Fork of LED_Demo by joey shelton

mbd_os/hal/common/FileSystemLike.cpp@1:55a6170b404f, 2016-09-17 (annotated)

Committer:
nexpaq
Date:
Sat Sep 17 16:32:05 2016 +0000
Revision:
1:55a6170b404f
checking in for sharing

Who changed what in which revision?

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nexpaq 1:55a6170b404f 1 /* mbed Microcontroller Library
nexpaq 1:55a6170b404f 2 * Copyright (c) 2006-2013 ARM Limited
nexpaq 1:55a6170b404f 3 *
nexpaq 1:55a6170b404f 4 * Licensed under the Apache License, Version 2.0 (the "License");
nexpaq 1:55a6170b404f 5 * you may not use this file except in compliance with the License.
nexpaq 1:55a6170b404f 6 * You may obtain a copy of the License at
nexpaq 1:55a6170b404f 7 *
nexpaq 1:55a6170b404f 8 * http://www.apache.org/licenses/LICENSE-2.0
nexpaq 1:55a6170b404f 9 *
nexpaq 1:55a6170b404f 10 * Unless required by applicable law or agreed to in writing, software
nexpaq 1:55a6170b404f 11 * distributed under the License is distributed on an "AS IS" BASIS,
nexpaq 1:55a6170b404f 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
nexpaq 1:55a6170b404f 13 * See the License for the specific language governing permissions and
nexpaq 1:55a6170b404f 14 * limitations under the License.
nexpaq 1:55a6170b404f 15 */
nexpaq 1:55a6170b404f 16 #include "FileSystemLike.h"
nexpaq 1:55a6170b404f 17
nexpaq 1:55a6170b404f 18 namespace mbed {
nexpaq 1:55a6170b404f 19
nexpaq 1:55a6170b404f 20 class BaseDirHandle : public DirHandle {
nexpaq 1:55a6170b404f 21 public:
nexpaq 1:55a6170b404f 22 /*
nexpaq 1:55a6170b404f 23 We keep track of our current location as the n'th object in the
nexpaq 1:55a6170b404f 24 FileSystemLike list. Using a Base* instead would cause problems if that
nexpaq 1:55a6170b404f 25 object were to be destroyed between readdirs.
nexpaq 1:55a6170b404f 26 Using this method does mean though that destroying/creating objects can
nexpaq 1:55a6170b404f 27 give unusual results from readdir.
nexpaq 1:55a6170b404f 28 */
nexpaq 1:55a6170b404f 29 off_t n;
nexpaq 1:55a6170b404f 30 struct dirent cur_entry;
nexpaq 1:55a6170b404f 31
nexpaq 1:55a6170b404f 32 BaseDirHandle() : n(0), cur_entry() {
nexpaq 1:55a6170b404f 33 }
nexpaq 1:55a6170b404f 34
nexpaq 1:55a6170b404f 35 virtual int closedir() {
nexpaq 1:55a6170b404f 36 // No lock can be used in destructor
nexpaq 1:55a6170b404f 37 delete this;
nexpaq 1:55a6170b404f 38 return 0;
nexpaq 1:55a6170b404f 39 }
nexpaq 1:55a6170b404f 40
nexpaq 1:55a6170b404f 41 virtual struct dirent *readdir() {
nexpaq 1:55a6170b404f 42 lock();
nexpaq 1:55a6170b404f 43 FileBase *ptr = FileBase::get(n);
nexpaq 1:55a6170b404f 44 if (ptr == NULL) {
nexpaq 1:55a6170b404f 45 unlock();
nexpaq 1:55a6170b404f 46 return NULL;
nexpaq 1:55a6170b404f 47 }
nexpaq 1:55a6170b404f 48
nexpaq 1:55a6170b404f 49 /* Increment n, so next readdir gets the next item */
nexpaq 1:55a6170b404f 50 n++;
nexpaq 1:55a6170b404f 51
nexpaq 1:55a6170b404f 52 /* Setup cur entry and return a pointer to it */
nexpaq 1:55a6170b404f 53 std::strncpy(cur_entry.d_name, ptr->getName(), NAME_MAX);
nexpaq 1:55a6170b404f 54 unlock();
nexpaq 1:55a6170b404f 55 return &cur_entry;
nexpaq 1:55a6170b404f 56 }
nexpaq 1:55a6170b404f 57
nexpaq 1:55a6170b404f 58 virtual off_t telldir() {
nexpaq 1:55a6170b404f 59 lock();
nexpaq 1:55a6170b404f 60 off_t offset = n;
nexpaq 1:55a6170b404f 61 unlock();
nexpaq 1:55a6170b404f 62 return offset;
nexpaq 1:55a6170b404f 63 }
nexpaq 1:55a6170b404f 64
nexpaq 1:55a6170b404f 65 virtual void seekdir(off_t offset) {
nexpaq 1:55a6170b404f 66 lock();
nexpaq 1:55a6170b404f 67 n = offset;
nexpaq 1:55a6170b404f 68 unlock();
nexpaq 1:55a6170b404f 69 }
nexpaq 1:55a6170b404f 70
nexpaq 1:55a6170b404f 71 virtual void rewinddir() {
nexpaq 1:55a6170b404f 72 lock();
nexpaq 1:55a6170b404f 73 n = 0;
nexpaq 1:55a6170b404f 74 unlock();
nexpaq 1:55a6170b404f 75 }
nexpaq 1:55a6170b404f 76
nexpaq 1:55a6170b404f 77 protected:
nexpaq 1:55a6170b404f 78 PlatformMutex _mutex;
nexpaq 1:55a6170b404f 79
nexpaq 1:55a6170b404f 80 virtual void lock() {
nexpaq 1:55a6170b404f 81 _mutex.lock();
nexpaq 1:55a6170b404f 82 }
nexpaq 1:55a6170b404f 83
nexpaq 1:55a6170b404f 84 virtual void unlock() {
nexpaq 1:55a6170b404f 85 _mutex.unlock();
nexpaq 1:55a6170b404f 86 }
nexpaq 1:55a6170b404f 87 };
nexpaq 1:55a6170b404f 88
nexpaq 1:55a6170b404f 89 FileSystemLike::FileSystemLike(const char *name) : FileBase(name, FileSystemPathType) {
nexpaq 1:55a6170b404f 90
nexpaq 1:55a6170b404f 91 }
nexpaq 1:55a6170b404f 92
nexpaq 1:55a6170b404f 93 FileSystemLike::~FileSystemLike() {
nexpaq 1:55a6170b404f 94
nexpaq 1:55a6170b404f 95 }
nexpaq 1:55a6170b404f 96
nexpaq 1:55a6170b404f 97 DirHandle *FileSystemLike::opendir() {
nexpaq 1:55a6170b404f 98 return new BaseDirHandle();
nexpaq 1:55a6170b404f 99 }
nexpaq 1:55a6170b404f 100
nexpaq 1:55a6170b404f 101 } // namespace mbed