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() {
00033         n = 0;
00034     }
00035 
00036     virtual int closedir() {
00037         delete this;
00038         return 0;
00039     }
00040 
00041     virtual struct dirent *readdir() {
00042         FileBase *ptr = FileBase::get(n);
00043         if (ptr == NULL) return NULL;
00044 
00045         /* Increment n, so next readdir gets the next item */
00046         n++;
00047 
00048         /* Setup cur entry and return a pointer to it */
00049         std::strncpy(cur_entry.d_name, ptr->getName(), NAME_MAX);
00050         return &cur_entry;
00051     }
00052 
00053     virtual off_t telldir() {
00054         return n;
00055     }
00056 
00057     virtual void seekdir(off_t offset) {
00058         n = offset;
00059     }
00060 
00061     virtual void rewinddir() {
00062         n = 0;
00063     }
00064 };
00065 
00066 FileSystemLike::FileSystemLike(const char *name) : FileBase(name, FileSystemPathType) {
00067 
00068 }
00069 
00070 FileSystemLike::~FileSystemLike() {
00071 
00072 }
00073 
00074 DirHandle *FileSystemLike::opendir() {
00075     return new BaseDirHandle();
00076 }
00077 
00078 } // namespace mbed