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FileBase.cpp
00001 /* mbed Microcontroller Library 00002 * Copyright (c) 2006-2013 ARM Limited 00003 * 00004 * Licensed under the Apache License, Version 2.0 (the "License"); 00005 * you may not use this file except in compliance with the License. 00006 * You may obtain a copy of the License at 00007 * 00008 * http://www.apache.org/licenses/LICENSE-2.0 00009 * 00010 * Unless required by applicable law or agreed to in writing, software 00011 * distributed under the License is distributed on an "AS IS" BASIS, 00012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 00013 * See the License for the specific language governing permissions and 00014 * limitations under the License. 00015 */ 00016 #include "platform/FileBase.h" 00017 #include "platform/FileLike.h" 00018 #include "platform/FileHandle.h" 00019 00020 namespace mbed { 00021 00022 FileBase *FileBase::_head = NULL; 00023 SingletonPtr<PlatformMutex> FileBase::_mutex; 00024 00025 FileBase::FileBase(const char *name, PathType t) : _next(NULL), 00026 _name(name), 00027 _path_type(t) { 00028 _mutex->lock(); 00029 if (name != NULL) { 00030 // put this object at head of the list 00031 _next = _head; 00032 _head = this; 00033 } else { 00034 _next = NULL; 00035 } 00036 _mutex->unlock(); 00037 } 00038 00039 FileBase::~FileBase() { 00040 _mutex->lock(); 00041 if (_name != NULL) { 00042 // remove this object from the list 00043 if (_head == this) { // first in the list, so just drop me 00044 _head = _next; 00045 } else { // find the object before me, then drop me 00046 FileBase *p = _head; 00047 while (p->_next != this) { 00048 p = p->_next; 00049 } 00050 p->_next = _next; 00051 } 00052 } 00053 _mutex->unlock(); 00054 00055 if (getPathType() == FilePathType) { 00056 extern void remove_filehandle(FileHandle *file); 00057 remove_filehandle(static_cast<FileHandle*>(static_cast<FileLike*>(this))); 00058 } 00059 } 00060 00061 FileBase *FileBase::lookup(const char *name, unsigned int len) { 00062 _mutex->lock(); 00063 FileBase *p = _head; 00064 while (p != NULL) { 00065 /* Check that p->_name matches name and is the correct length */ 00066 if (p->_name != NULL && std::strncmp(p->_name, name, len) == 0 && std::strlen(p->_name) == len) { 00067 _mutex->unlock(); 00068 return p; 00069 } 00070 p = p->_next; 00071 } 00072 _mutex->unlock(); 00073 return NULL; 00074 } 00075 00076 FileBase *FileBase::get(int n) { 00077 _mutex->lock(); 00078 FileBase *p = _head; 00079 int m = 0; 00080 while (p != NULL) { 00081 if (m == n) { 00082 _mutex->unlock(); 00083 return p; 00084 } 00085 00086 m++; 00087 p = p->_next; 00088 } 00089 _mutex->unlock(); 00090 return NULL; 00091 } 00092 00093 const char* FileBase::getName(void) { 00094 // Constant read so no lock needed 00095 return _name; 00096 } 00097 00098 PathType FileBase::getPathType(void) { 00099 // Constant read so no lock needed 00100 return _path_type; 00101 } 00102 00103 } // namespace mbed 00104
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