mirror of https://github.com/ARMmbed/mbed-os.git
130 lines
3.0 KiB
C++
130 lines
3.0 KiB
C++
/* mbed Microcontroller Library
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* Copyright (c) 2006-2013 ARM Limited
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <cstring>
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#include "platform/FileBase.h"
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#include "platform/FileLike.h"
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#include "platform/FileHandle.h"
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namespace mbed {
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FileBase *FileBase::_head = NULL;
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SingletonPtr<PlatformMutex> FileBase::_mutex;
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FileBase *FileBase::_default = NULL;
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FileBase::FileBase(const char *name, PathType t) : _next(NULL),
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_name(name),
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_path_type(t)
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{
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_mutex->lock();
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if (name != NULL) {
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// put this object at head of the list
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_next = _head;
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_head = this;
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} else {
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_next = NULL;
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}
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_mutex->unlock();
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}
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FileBase::~FileBase()
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{
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_mutex->lock();
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if (_name != NULL) {
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// remove this object from the list
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if (_head == this) { // first in the list, so just drop me
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_head = _next;
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} else { // find the object before me, then drop me
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FileBase *p = _head;
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while (p->_next != this) {
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p = p->_next;
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}
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p->_next = _next;
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}
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}
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if (_default == this) {
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_default = NULL;
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}
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_mutex->unlock();
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if (getPathType() == FilePathType) {
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extern void remove_filehandle(FileHandle * file);
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remove_filehandle(static_cast<FileLike *>(this));
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}
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}
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void FileBase::set_as_default()
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{
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_mutex->lock();
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_default = this;
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_mutex->unlock();
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}
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FileBase *FileBase::lookup(const char *name, unsigned int len)
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{
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_mutex->lock();
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FileBase *p = _head;
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while (p != NULL) {
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/* Check that p->_name matches name and is the correct length */
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if (p->_name != NULL && len == std::strlen(p->_name) && std::memcmp(p->_name, name, len) == 0) {
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_mutex->unlock();
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return p;
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}
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p = p->_next;
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}
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if (len == (sizeof "default") - 1 && std::memcmp("default", name, len) == 0) {
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_mutex->unlock();
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return _default;
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}
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_mutex->unlock();
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return NULL;
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}
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FileBase *FileBase::get(int n)
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{
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_mutex->lock();
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FileBase *p = _head;
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int m = 0;
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while (p != NULL) {
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if (m == n) {
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_mutex->unlock();
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return p;
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}
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m++;
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p = p->_next;
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}
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_mutex->unlock();
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return NULL;
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}
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const char *FileBase::getName(void)
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{
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// Constant read so no lock needed
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return _name;
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}
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PathType FileBase::getPathType(void)
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{
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// Constant read so no lock needed
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return _path_type;
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}
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} // namespace mbed
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