Ermanno Brusadin / mbed-src

mbed library sources

common/FileSystemLike.cpp@0:0a673c671a56, 2016-07-27 (annotated)

Committer:
ebrus
Date:
Wed Jul 27 18:35:32 2016 +0000
Revision:
0:0a673c671a56
4

Who changed what in which revision?

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ebrus 0:0a673c671a56 1 /* mbed Microcontroller Library
ebrus 0:0a673c671a56 2 * Copyright (c) 2006-2013 ARM Limited
ebrus 0:0a673c671a56 3 *
ebrus 0:0a673c671a56 4 * Licensed under the Apache License, Version 2.0 (the "License");
ebrus 0:0a673c671a56 5 * you may not use this file except in compliance with the License.
ebrus 0:0a673c671a56 6 * You may obtain a copy of the License at
ebrus 0:0a673c671a56 7 *
ebrus 0:0a673c671a56 8 * http://www.apache.org/licenses/LICENSE-2.0
ebrus 0:0a673c671a56 9 *
ebrus 0:0a673c671a56 10 * Unless required by applicable law or agreed to in writing, software
ebrus 0:0a673c671a56 11 * distributed under the License is distributed on an "AS IS" BASIS,
ebrus 0:0a673c671a56 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
ebrus 0:0a673c671a56 13 * See the License for the specific language governing permissions and
ebrus 0:0a673c671a56 14 * limitations under the License.
ebrus 0:0a673c671a56 15 */
ebrus 0:0a673c671a56 16 #include "FileSystemLike.h"
ebrus 0:0a673c671a56 17
ebrus 0:0a673c671a56 18 namespace mbed {
ebrus 0:0a673c671a56 19
ebrus 0:0a673c671a56 20 class BaseDirHandle : public DirHandle {
ebrus 0:0a673c671a56 21 public:
ebrus 0:0a673c671a56 22 /*
ebrus 0:0a673c671a56 23 We keep track of our current location as the n'th object in the
ebrus 0:0a673c671a56 24 FileSystemLike list. Using a Base* instead would cause problems if that
ebrus 0:0a673c671a56 25 object were to be destroyed between readdirs.
ebrus 0:0a673c671a56 26 Using this method does mean though that destroying/creating objects can
ebrus 0:0a673c671a56 27 give unusual results from readdir.
ebrus 0:0a673c671a56 28 */
ebrus 0:0a673c671a56 29 off_t n;
ebrus 0:0a673c671a56 30 struct dirent cur_entry;
ebrus 0:0a673c671a56 31
ebrus 0:0a673c671a56 32 BaseDirHandle() : n(0), cur_entry() {
ebrus 0:0a673c671a56 33 }
ebrus 0:0a673c671a56 34
ebrus 0:0a673c671a56 35 virtual int closedir() {
ebrus 0:0a673c671a56 36 delete this;
ebrus 0:0a673c671a56 37 return 0;
ebrus 0:0a673c671a56 38 }
ebrus 0:0a673c671a56 39
ebrus 0:0a673c671a56 40 virtual struct dirent *readdir() {
ebrus 0:0a673c671a56 41 FileBase *ptr = FileBase::get(n);
ebrus 0:0a673c671a56 42 if (ptr == NULL) return NULL;
ebrus 0:0a673c671a56 43
ebrus 0:0a673c671a56 44 /* Increment n, so next readdir gets the next item */
ebrus 0:0a673c671a56 45 n++;
ebrus 0:0a673c671a56 46
ebrus 0:0a673c671a56 47 /* Setup cur entry and return a pointer to it */
ebrus 0:0a673c671a56 48 std::strncpy(cur_entry.d_name, ptr->getName(), NAME_MAX);
ebrus 0:0a673c671a56 49 return &cur_entry;
ebrus 0:0a673c671a56 50 }
ebrus 0:0a673c671a56 51
ebrus 0:0a673c671a56 52 virtual off_t telldir() {
ebrus 0:0a673c671a56 53 return n;
ebrus 0:0a673c671a56 54 }
ebrus 0:0a673c671a56 55
ebrus 0:0a673c671a56 56 virtual void seekdir(off_t offset) {
ebrus 0:0a673c671a56 57 n = offset;
ebrus 0:0a673c671a56 58 }
ebrus 0:0a673c671a56 59
ebrus 0:0a673c671a56 60 virtual void rewinddir() {
ebrus 0:0a673c671a56 61 n = 0;
ebrus 0:0a673c671a56 62 }
ebrus 0:0a673c671a56 63 };
ebrus 0:0a673c671a56 64
ebrus 0:0a673c671a56 65 FileSystemLike::FileSystemLike(const char *name) : FileBase(name, FileSystemPathType) {
ebrus 0:0a673c671a56 66
ebrus 0:0a673c671a56 67 }
ebrus 0:0a673c671a56 68
ebrus 0:0a673c671a56 69 FileSystemLike::~FileSystemLike() {
ebrus 0:0a673c671a56 70
ebrus 0:0a673c671a56 71 }
ebrus 0:0a673c671a56 72
ebrus 0:0a673c671a56 73 DirHandle *FileSystemLike::opendir() {
ebrus 0:0a673c671a56 74 return new BaseDirHandle();
ebrus 0:0a673c671a56 75 }
ebrus 0:0a673c671a56 76
ebrus 0:0a673c671a56 77 } // namespace mbed