Thor Hall / mbed-dev_mbed_lib_v125

This fork captures the mbed lib v125 for ease of integration into older projects.

Fork of mbed-dev by mbed official

common/FileSystemLike.cpp@187:92cbb9eec47b, 2018-07-20 (annotated)

Committer:
apluscw
Date:
Fri Jul 20 21:24:42 2018 +0000
Revision:
187:92cbb9eec47b
Mbed library with source code from mbed lib v125. Posted to ease integration with some older projects.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
apluscw 187:92cbb9eec47b 1 /* mbed Microcontroller Library
apluscw 187:92cbb9eec47b 2 * Copyright (c) 2006-2013 ARM Limited
apluscw 187:92cbb9eec47b 3 *
apluscw 187:92cbb9eec47b 4 * Licensed under the Apache License, Version 2.0 (the "License");
apluscw 187:92cbb9eec47b 5 * you may not use this file except in compliance with the License.
apluscw 187:92cbb9eec47b 6 * You may obtain a copy of the License at
apluscw 187:92cbb9eec47b 7 *
apluscw 187:92cbb9eec47b 8 * http://www.apache.org/licenses/LICENSE-2.0
apluscw 187:92cbb9eec47b 9 *
apluscw 187:92cbb9eec47b 10 * Unless required by applicable law or agreed to in writing, software
apluscw 187:92cbb9eec47b 11 * distributed under the License is distributed on an "AS IS" BASIS,
apluscw 187:92cbb9eec47b 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
apluscw 187:92cbb9eec47b 13 * See the License for the specific language governing permissions and
apluscw 187:92cbb9eec47b 14 * limitations under the License.
apluscw 187:92cbb9eec47b 15 */
apluscw 187:92cbb9eec47b 16 #include "FileSystemLike.h"
apluscw 187:92cbb9eec47b 17
apluscw 187:92cbb9eec47b 18 namespace mbed {
apluscw 187:92cbb9eec47b 19
apluscw 187:92cbb9eec47b 20 class BaseDirHandle : public DirHandle {
apluscw 187:92cbb9eec47b 21 public:
apluscw 187:92cbb9eec47b 22 /*
apluscw 187:92cbb9eec47b 23 We keep track of our current location as the n'th object in the
apluscw 187:92cbb9eec47b 24 FileSystemLike list. Using a Base* instead would cause problems if that
apluscw 187:92cbb9eec47b 25 object were to be destroyed between readdirs.
apluscw 187:92cbb9eec47b 26 Using this method does mean though that destroying/creating objects can
apluscw 187:92cbb9eec47b 27 give unusual results from readdir.
apluscw 187:92cbb9eec47b 28 */
apluscw 187:92cbb9eec47b 29 off_t n;
apluscw 187:92cbb9eec47b 30 struct dirent cur_entry;
apluscw 187:92cbb9eec47b 31
apluscw 187:92cbb9eec47b 32 BaseDirHandle() : n(0), cur_entry() {
apluscw 187:92cbb9eec47b 33 }
apluscw 187:92cbb9eec47b 34
apluscw 187:92cbb9eec47b 35 virtual int closedir() {
apluscw 187:92cbb9eec47b 36 // No lock can be used in destructor
apluscw 187:92cbb9eec47b 37 delete this;
apluscw 187:92cbb9eec47b 38 return 0;
apluscw 187:92cbb9eec47b 39 }
apluscw 187:92cbb9eec47b 40
apluscw 187:92cbb9eec47b 41 virtual struct dirent *readdir() {
apluscw 187:92cbb9eec47b 42 lock();
apluscw 187:92cbb9eec47b 43 FileBase *ptr = FileBase::get(n);
apluscw 187:92cbb9eec47b 44 if (ptr == NULL) {
apluscw 187:92cbb9eec47b 45 unlock();
apluscw 187:92cbb9eec47b 46 return NULL;
apluscw 187:92cbb9eec47b 47 }
apluscw 187:92cbb9eec47b 48
apluscw 187:92cbb9eec47b 49 /* Increment n, so next readdir gets the next item */
apluscw 187:92cbb9eec47b 50 n++;
apluscw 187:92cbb9eec47b 51
apluscw 187:92cbb9eec47b 52 /* Setup cur entry and return a pointer to it */
apluscw 187:92cbb9eec47b 53 std::strncpy(cur_entry.d_name, ptr->getName(), NAME_MAX);
apluscw 187:92cbb9eec47b 54 unlock();
apluscw 187:92cbb9eec47b 55 return &cur_entry;
apluscw 187:92cbb9eec47b 56 }
apluscw 187:92cbb9eec47b 57
apluscw 187:92cbb9eec47b 58 virtual off_t telldir() {
apluscw 187:92cbb9eec47b 59 lock();
apluscw 187:92cbb9eec47b 60 off_t offset = n;
apluscw 187:92cbb9eec47b 61 unlock();
apluscw 187:92cbb9eec47b 62 return offset;
apluscw 187:92cbb9eec47b 63 }
apluscw 187:92cbb9eec47b 64
apluscw 187:92cbb9eec47b 65 virtual void seekdir(off_t offset) {
apluscw 187:92cbb9eec47b 66 lock();
apluscw 187:92cbb9eec47b 67 n = offset;
apluscw 187:92cbb9eec47b 68 unlock();
apluscw 187:92cbb9eec47b 69 }
apluscw 187:92cbb9eec47b 70
apluscw 187:92cbb9eec47b 71 virtual void rewinddir() {
apluscw 187:92cbb9eec47b 72 lock();
apluscw 187:92cbb9eec47b 73 n = 0;
apluscw 187:92cbb9eec47b 74 unlock();
apluscw 187:92cbb9eec47b 75 }
apluscw 187:92cbb9eec47b 76
apluscw 187:92cbb9eec47b 77 protected:
apluscw 187:92cbb9eec47b 78 PlatformMutex _mutex;
apluscw 187:92cbb9eec47b 79
apluscw 187:92cbb9eec47b 80 virtual void lock() {
apluscw 187:92cbb9eec47b 81 _mutex.lock();
apluscw 187:92cbb9eec47b 82 }
apluscw 187:92cbb9eec47b 83
apluscw 187:92cbb9eec47b 84 virtual void unlock() {
apluscw 187:92cbb9eec47b 85 _mutex.unlock();
apluscw 187:92cbb9eec47b 86 }
apluscw 187:92cbb9eec47b 87 };
apluscw 187:92cbb9eec47b 88
apluscw 187:92cbb9eec47b 89 FileSystemLike::FileSystemLike(const char *name) : FileBase(name, FileSystemPathType) {
apluscw 187:92cbb9eec47b 90
apluscw 187:92cbb9eec47b 91 }
apluscw 187:92cbb9eec47b 92
apluscw 187:92cbb9eec47b 93 FileSystemLike::~FileSystemLike() {
apluscw 187:92cbb9eec47b 94
apluscw 187:92cbb9eec47b 95 }
apluscw 187:92cbb9eec47b 96
apluscw 187:92cbb9eec47b 97 DirHandle *FileSystemLike::opendir() {
apluscw 187:92cbb9eec47b 98 return new BaseDirHandle();
apluscw 187:92cbb9eec47b 99 }
apluscw 187:92cbb9eec47b 100
apluscw 187:92cbb9eec47b 101 } // namespace mbed