Lee Kai Xuan / mbed-os

mbed-os

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drivers/FileBase.cpp@0:f269e3021894, 2016-10-23 (annotated)

Committer:
elessair
Date:
Sun Oct 23 15:10:02 2016 +0000
Revision:
0:f269e3021894
Initial commit

Who changed what in which revision?

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elessair 0:f269e3021894 1 /* mbed Microcontroller Library
elessair 0:f269e3021894 2 * Copyright (c) 2006-2013 ARM Limited
elessair 0:f269e3021894 3 *
elessair 0:f269e3021894 4 * Licensed under the Apache License, Version 2.0 (the "License");
elessair 0:f269e3021894 5 * you may not use this file except in compliance with the License.
elessair 0:f269e3021894 6 * You may obtain a copy of the License at
elessair 0:f269e3021894 7 *
elessair 0:f269e3021894 8 * http://www.apache.org/licenses/LICENSE-2.0
elessair 0:f269e3021894 9 *
elessair 0:f269e3021894 10 * Unless required by applicable law or agreed to in writing, software
elessair 0:f269e3021894 11 * distributed under the License is distributed on an "AS IS" BASIS,
elessair 0:f269e3021894 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
elessair 0:f269e3021894 13 * See the License for the specific language governing permissions and
elessair 0:f269e3021894 14 * limitations under the License.
elessair 0:f269e3021894 15 */
elessair 0:f269e3021894 16 #include "drivers/FileBase.h"
elessair 0:f269e3021894 17
elessair 0:f269e3021894 18 namespace mbed {
elessair 0:f269e3021894 19
elessair 0:f269e3021894 20 FileBase *FileBase::_head = NULL;
elessair 0:f269e3021894 21 SingletonPtr<PlatformMutex> FileBase::_mutex;
elessair 0:f269e3021894 22
elessair 0:f269e3021894 23 FileBase::FileBase(const char *name, PathType t) : _next(NULL),
elessair 0:f269e3021894 24 _name(name),
elessair 0:f269e3021894 25 _path_type(t) {
elessair 0:f269e3021894 26 _mutex->lock();
elessair 0:f269e3021894 27 if (name != NULL) {
elessair 0:f269e3021894 28 // put this object at head of the list
elessair 0:f269e3021894 29 _next = _head;
elessair 0:f269e3021894 30 _head = this;
elessair 0:f269e3021894 31 } else {
elessair 0:f269e3021894 32 _next = NULL;
elessair 0:f269e3021894 33 }
elessair 0:f269e3021894 34 _mutex->unlock();
elessair 0:f269e3021894 35 }
elessair 0:f269e3021894 36
elessair 0:f269e3021894 37 FileBase::~FileBase() {
elessair 0:f269e3021894 38 _mutex->lock();
elessair 0:f269e3021894 39 if (_name != NULL) {
elessair 0:f269e3021894 40 // remove this object from the list
elessair 0:f269e3021894 41 if (_head == this) { // first in the list, so just drop me
elessair 0:f269e3021894 42 _head = _next;
elessair 0:f269e3021894 43 } else { // find the object before me, then drop me
elessair 0:f269e3021894 44 FileBase *p = _head;
elessair 0:f269e3021894 45 while (p->_next != this) {
elessair 0:f269e3021894 46 p = p->_next;
elessair 0:f269e3021894 47 }
elessair 0:f269e3021894 48 p->_next = _next;
elessair 0:f269e3021894 49 }
elessair 0:f269e3021894 50 }
elessair 0:f269e3021894 51 _mutex->unlock();
elessair 0:f269e3021894 52 }
elessair 0:f269e3021894 53
elessair 0:f269e3021894 54 FileBase *FileBase::lookup(const char *name, unsigned int len) {
elessair 0:f269e3021894 55 _mutex->lock();
elessair 0:f269e3021894 56 FileBase *p = _head;
elessair 0:f269e3021894 57 while (p != NULL) {
elessair 0:f269e3021894 58 /* Check that p->_name matches name and is the correct length */
elessair 0:f269e3021894 59 if (p->_name != NULL && std::strncmp(p->_name, name, len) == 0 && std::strlen(p->_name) == len) {
elessair 0:f269e3021894 60 _mutex->unlock();
elessair 0:f269e3021894 61 return p;
elessair 0:f269e3021894 62 }
elessair 0:f269e3021894 63 p = p->_next;
elessair 0:f269e3021894 64 }
elessair 0:f269e3021894 65 _mutex->unlock();
elessair 0:f269e3021894 66 return NULL;
elessair 0:f269e3021894 67 }
elessair 0:f269e3021894 68
elessair 0:f269e3021894 69 FileBase *FileBase::get(int n) {
elessair 0:f269e3021894 70 _mutex->lock();
elessair 0:f269e3021894 71 FileBase *p = _head;
elessair 0:f269e3021894 72 int m = 0;
elessair 0:f269e3021894 73 while (p != NULL) {
elessair 0:f269e3021894 74 if (m == n) {
elessair 0:f269e3021894 75 _mutex->unlock();
elessair 0:f269e3021894 76 return p;
elessair 0:f269e3021894 77 }
elessair 0:f269e3021894 78
elessair 0:f269e3021894 79 m++;
elessair 0:f269e3021894 80 p = p->_next;
elessair 0:f269e3021894 81 }
elessair 0:f269e3021894 82 _mutex->unlock();
elessair 0:f269e3021894 83 return NULL;
elessair 0:f269e3021894 84 }
elessair 0:f269e3021894 85
elessair 0:f269e3021894 86 const char* FileBase::getName(void) {
elessair 0:f269e3021894 87 // Constant read so no lock needed
elessair 0:f269e3021894 88 return _name;
elessair 0:f269e3021894 89 }
elessair 0:f269e3021894 90
elessair 0:f269e3021894 91 PathType FileBase::getPathType(void) {
elessair 0:f269e3021894 92 // Constant read so no lock needed
elessair 0:f269e3021894 93 return _path_type;
elessair 0:f269e3021894 94 }
elessair 0:f269e3021894 95
elessair 0:f269e3021894 96 } // namespace mbed
elessair 0:f269e3021894 97