PHung Tung / SRC_STM32F7

SPKT

Dependents:   WAV

common/FileSystemLike.cpp@0:e87aa4c49e95, 2019-06-04 (annotated)

Committer:
phungductung
Date:
Tue Jun 04 21:51:46 2019 +0000
Revision:
0:e87aa4c49e95
libray

Who changed what in which revision?

UserRevisionLine numberNew contents of line
phungductung 0:e87aa4c49e95 1 /* mbed Microcontroller Library
phungductung 0:e87aa4c49e95 2 * Copyright (c) 2006-2013 ARM Limited
phungductung 0:e87aa4c49e95 3 *
phungductung 0:e87aa4c49e95 4 * Licensed under the Apache License, Version 2.0 (the "License");
phungductung 0:e87aa4c49e95 5 * you may not use this file except in compliance with the License.
phungductung 0:e87aa4c49e95 6 * You may obtain a copy of the License at
phungductung 0:e87aa4c49e95 7 *
phungductung 0:e87aa4c49e95 8 * http://www.apache.org/licenses/LICENSE-2.0
phungductung 0:e87aa4c49e95 9 *
phungductung 0:e87aa4c49e95 10 * Unless required by applicable law or agreed to in writing, software
phungductung 0:e87aa4c49e95 11 * distributed under the License is distributed on an "AS IS" BASIS,
phungductung 0:e87aa4c49e95 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
phungductung 0:e87aa4c49e95 13 * See the License for the specific language governing permissions and
phungductung 0:e87aa4c49e95 14 * limitations under the License.
phungductung 0:e87aa4c49e95 15 */
phungductung 0:e87aa4c49e95 16 #include "FileSystemLike.h"
phungductung 0:e87aa4c49e95 17
phungductung 0:e87aa4c49e95 18 namespace mbed {
phungductung 0:e87aa4c49e95 19
phungductung 0:e87aa4c49e95 20 class BaseDirHandle : public DirHandle {
phungductung 0:e87aa4c49e95 21 public:
phungductung 0:e87aa4c49e95 22 /*
phungductung 0:e87aa4c49e95 23 We keep track of our current location as the n'th object in the
phungductung 0:e87aa4c49e95 24 FileSystemLike list. Using a Base* instead would cause problems if that
phungductung 0:e87aa4c49e95 25 object were to be destroyed between readdirs.
phungductung 0:e87aa4c49e95 26 Using this method does mean though that destroying/creating objects can
phungductung 0:e87aa4c49e95 27 give unusual results from readdir.
phungductung 0:e87aa4c49e95 28 */
phungductung 0:e87aa4c49e95 29 off_t n;
phungductung 0:e87aa4c49e95 30 struct dirent cur_entry;
phungductung 0:e87aa4c49e95 31
phungductung 0:e87aa4c49e95 32 BaseDirHandle() : n(0), cur_entry() {
phungductung 0:e87aa4c49e95 33 }
phungductung 0:e87aa4c49e95 34
phungductung 0:e87aa4c49e95 35 virtual int closedir() {
phungductung 0:e87aa4c49e95 36 delete this;
phungductung 0:e87aa4c49e95 37 return 0;
phungductung 0:e87aa4c49e95 38 }
phungductung 0:e87aa4c49e95 39
phungductung 0:e87aa4c49e95 40 virtual struct dirent *readdir() {
phungductung 0:e87aa4c49e95 41 FileBase *ptr = FileBase::get(n);
phungductung 0:e87aa4c49e95 42 if (ptr == NULL) return NULL;
phungductung 0:e87aa4c49e95 43
phungductung 0:e87aa4c49e95 44 /* Increment n, so next readdir gets the next item */
phungductung 0:e87aa4c49e95 45 n++;
phungductung 0:e87aa4c49e95 46
phungductung 0:e87aa4c49e95 47 /* Setup cur entry and return a pointer to it */
phungductung 0:e87aa4c49e95 48 std::strncpy(cur_entry.d_name, ptr->getName(), NAME_MAX);
phungductung 0:e87aa4c49e95 49 return &cur_entry;
phungductung 0:e87aa4c49e95 50 }
phungductung 0:e87aa4c49e95 51
phungductung 0:e87aa4c49e95 52 virtual off_t telldir() {
phungductung 0:e87aa4c49e95 53 return n;
phungductung 0:e87aa4c49e95 54 }
phungductung 0:e87aa4c49e95 55
phungductung 0:e87aa4c49e95 56 virtual void seekdir(off_t offset) {
phungductung 0:e87aa4c49e95 57 n = offset;
phungductung 0:e87aa4c49e95 58 }
phungductung 0:e87aa4c49e95 59
phungductung 0:e87aa4c49e95 60 virtual void rewinddir() {
phungductung 0:e87aa4c49e95 61 n = 0;
phungductung 0:e87aa4c49e95 62 }
phungductung 0:e87aa4c49e95 63 };
phungductung 0:e87aa4c49e95 64
phungductung 0:e87aa4c49e95 65 FileSystemLike::FileSystemLike(const char *name) : FileBase(name, FileSystemPathType) {
phungductung 0:e87aa4c49e95 66
phungductung 0:e87aa4c49e95 67 }
phungductung 0:e87aa4c49e95 68
phungductung 0:e87aa4c49e95 69 FileSystemLike::~FileSystemLike() {
phungductung 0:e87aa4c49e95 70
phungductung 0:e87aa4c49e95 71 }
phungductung 0:e87aa4c49e95 72
phungductung 0:e87aa4c49e95 73 DirHandle *FileSystemLike::opendir() {
phungductung 0:e87aa4c49e95 74 return new BaseDirHandle();
phungductung 0:e87aa4c49e95 75 }
phungductung 0:e87aa4c49e95 76
phungductung 0:e87aa4c49e95 77 } // namespace mbed