mbed library sources. Supersedes mbed-src.
Dependents: LPCXpresso1769_blinky
Fork of mbed-dev by
FileSystemLike.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 "FileSystemLike.h" 00017 00018 namespace mbed { 00019 00020 class BaseDirHandle : public DirHandle { 00021 public: 00022 /* 00023 We keep track of our current location as the n'th object in the 00024 FileSystemLike list. Using a Base* instead would cause problems if that 00025 object were to be destroyed between readdirs. 00026 Using this method does mean though that destroying/creating objects can 00027 give unusual results from readdir. 00028 */ 00029 off_t n; 00030 struct dirent cur_entry; 00031 00032 BaseDirHandle() : n(0), cur_entry() { 00033 } 00034 00035 virtual int closedir() { 00036 // No lock can be used in destructor 00037 delete this; 00038 return 0; 00039 } 00040 00041 virtual struct dirent *readdir() { 00042 lock(); 00043 FileBase *ptr = FileBase::get(n); 00044 if (ptr == NULL) { 00045 unlock(); 00046 return NULL; 00047 } 00048 00049 /* Increment n, so next readdir gets the next item */ 00050 n++; 00051 00052 /* Setup cur entry and return a pointer to it */ 00053 std::strncpy(cur_entry.d_name, ptr->getName(), NAME_MAX); 00054 unlock(); 00055 return &cur_entry; 00056 } 00057 00058 virtual off_t telldir() { 00059 lock(); 00060 off_t offset = n; 00061 unlock(); 00062 return offset; 00063 } 00064 00065 virtual void seekdir(off_t offset) { 00066 lock(); 00067 n = offset; 00068 unlock(); 00069 } 00070 00071 virtual void rewinddir() { 00072 lock(); 00073 n = 0; 00074 unlock(); 00075 } 00076 00077 protected: 00078 PlatformMutex _mutex; 00079 00080 virtual void lock() { 00081 _mutex.lock(); 00082 } 00083 00084 virtual void unlock() { 00085 _mutex.unlock(); 00086 } 00087 }; 00088 00089 FileSystemLike::FileSystemLike(const char *name) : FileBase(name, FileSystemPathType) { 00090 00091 } 00092 00093 FileSystemLike::~FileSystemLike() { 00094 00095 } 00096 00097 DirHandle *FileSystemLike::opendir() { 00098 return new BaseDirHandle(); 00099 } 00100 00101 } // namespace mbed
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