Gan likun / mbed-dev

00

platform/FileBase.cpp@0:13413ea9a877, 2022-06-12 (annotated)

Committer:
ganlikun
Date:
Sun Jun 12 14:02:44 2022 +0000
Revision:
0:13413ea9a877
00

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ganlikun 0:13413ea9a877 1 /* mbed Microcontroller Library
ganlikun 0:13413ea9a877 2 * Copyright (c) 2006-2013 ARM Limited
ganlikun 0:13413ea9a877 3 *
ganlikun 0:13413ea9a877 4 * Licensed under the Apache License, Version 2.0 (the "License");
ganlikun 0:13413ea9a877 5 * you may not use this file except in compliance with the License.
ganlikun 0:13413ea9a877 6 * You may obtain a copy of the License at
ganlikun 0:13413ea9a877 7 *
ganlikun 0:13413ea9a877 8 * http://www.apache.org/licenses/LICENSE-2.0
ganlikun 0:13413ea9a877 9 *
ganlikun 0:13413ea9a877 10 * Unless required by applicable law or agreed to in writing, software
ganlikun 0:13413ea9a877 11 * distributed under the License is distributed on an "AS IS" BASIS,
ganlikun 0:13413ea9a877 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
ganlikun 0:13413ea9a877 13 * See the License for the specific language governing permissions and
ganlikun 0:13413ea9a877 14 * limitations under the License.
ganlikun 0:13413ea9a877 15 */
ganlikun 0:13413ea9a877 16 #include "platform/FileBase.h"
ganlikun 0:13413ea9a877 17 #include "platform/FileLike.h"
ganlikun 0:13413ea9a877 18 #include "platform/FileHandle.h"
ganlikun 0:13413ea9a877 19
ganlikun 0:13413ea9a877 20 namespace mbed {
ganlikun 0:13413ea9a877 21
ganlikun 0:13413ea9a877 22 FileBase *FileBase::_head = NULL;
ganlikun 0:13413ea9a877 23 SingletonPtr<PlatformMutex> FileBase::_mutex;
ganlikun 0:13413ea9a877 24
ganlikun 0:13413ea9a877 25 FileBase::FileBase(const char *name, PathType t) : _next(NULL),
ganlikun 0:13413ea9a877 26 _name(name),
ganlikun 0:13413ea9a877 27 _path_type(t) {
ganlikun 0:13413ea9a877 28 _mutex->lock();
ganlikun 0:13413ea9a877 29 if (name != NULL) {
ganlikun 0:13413ea9a877 30 // put this object at head of the list
ganlikun 0:13413ea9a877 31 _next = _head;
ganlikun 0:13413ea9a877 32 _head = this;
ganlikun 0:13413ea9a877 33 } else {
ganlikun 0:13413ea9a877 34 _next = NULL;
ganlikun 0:13413ea9a877 35 }
ganlikun 0:13413ea9a877 36 _mutex->unlock();
ganlikun 0:13413ea9a877 37 }
ganlikun 0:13413ea9a877 38
ganlikun 0:13413ea9a877 39 FileBase::~FileBase() {
ganlikun 0:13413ea9a877 40 _mutex->lock();
ganlikun 0:13413ea9a877 41 if (_name != NULL) {
ganlikun 0:13413ea9a877 42 // remove this object from the list
ganlikun 0:13413ea9a877 43 if (_head == this) { // first in the list, so just drop me
ganlikun 0:13413ea9a877 44 _head = _next;
ganlikun 0:13413ea9a877 45 } else { // find the object before me, then drop me
ganlikun 0:13413ea9a877 46 FileBase *p = _head;
ganlikun 0:13413ea9a877 47 while (p->_next != this) {
ganlikun 0:13413ea9a877 48 p = p->_next;
ganlikun 0:13413ea9a877 49 }
ganlikun 0:13413ea9a877 50 p->_next = _next;
ganlikun 0:13413ea9a877 51 }
ganlikun 0:13413ea9a877 52 }
ganlikun 0:13413ea9a877 53 _mutex->unlock();
ganlikun 0:13413ea9a877 54
ganlikun 0:13413ea9a877 55 if (getPathType() == FilePathType) {
ganlikun 0:13413ea9a877 56 extern void remove_filehandle(FileHandle *file);
ganlikun 0:13413ea9a877 57 remove_filehandle(static_cast<FileHandle*>(static_cast<FileLike*>(this)));
ganlikun 0:13413ea9a877 58 }
ganlikun 0:13413ea9a877 59 }
ganlikun 0:13413ea9a877 60
ganlikun 0:13413ea9a877 61 FileBase *FileBase::lookup(const char *name, unsigned int len) {
ganlikun 0:13413ea9a877 62 _mutex->lock();
ganlikun 0:13413ea9a877 63 FileBase *p = _head;
ganlikun 0:13413ea9a877 64 while (p != NULL) {
ganlikun 0:13413ea9a877 65 /* Check that p->_name matches name and is the correct length */
ganlikun 0:13413ea9a877 66 if (p->_name != NULL && std::strncmp(p->_name, name, len) == 0 && std::strlen(p->_name) == len) {
ganlikun 0:13413ea9a877 67 _mutex->unlock();
ganlikun 0:13413ea9a877 68 return p;
ganlikun 0:13413ea9a877 69 }
ganlikun 0:13413ea9a877 70 p = p->_next;
ganlikun 0:13413ea9a877 71 }
ganlikun 0:13413ea9a877 72 _mutex->unlock();
ganlikun 0:13413ea9a877 73 return NULL;
ganlikun 0:13413ea9a877 74 }
ganlikun 0:13413ea9a877 75
ganlikun 0:13413ea9a877 76 FileBase *FileBase::get(int n) {
ganlikun 0:13413ea9a877 77 _mutex->lock();
ganlikun 0:13413ea9a877 78 FileBase *p = _head;
ganlikun 0:13413ea9a877 79 int m = 0;
ganlikun 0:13413ea9a877 80 while (p != NULL) {
ganlikun 0:13413ea9a877 81 if (m == n) {
ganlikun 0:13413ea9a877 82 _mutex->unlock();
ganlikun 0:13413ea9a877 83 return p;
ganlikun 0:13413ea9a877 84 }
ganlikun 0:13413ea9a877 85
ganlikun 0:13413ea9a877 86 m++;
ganlikun 0:13413ea9a877 87 p = p->_next;
ganlikun 0:13413ea9a877 88 }
ganlikun 0:13413ea9a877 89 _mutex->unlock();
ganlikun 0:13413ea9a877 90 return NULL;
ganlikun 0:13413ea9a877 91 }
ganlikun 0:13413ea9a877 92
ganlikun 0:13413ea9a877 93 const char* FileBase::getName(void) {
ganlikun 0:13413ea9a877 94 // Constant read so no lock needed
ganlikun 0:13413ea9a877 95 return _name;
ganlikun 0:13413ea9a877 96 }
ganlikun 0:13413ea9a877 97
ganlikun 0:13413ea9a877 98 PathType FileBase::getPathType(void) {
ganlikun 0:13413ea9a877 99 // Constant read so no lock needed
ganlikun 0:13413ea9a877 100 return _path_type;
ganlikun 0:13413ea9a877 101 }
ganlikun 0:13413ea9a877 102
ganlikun 0:13413ea9a877 103 } // namespace mbed
ganlikun 0:13413ea9a877 104
ganlikun 0:13413ea9a877 105