tmk_core/tool/mbed/mbed-sdk/libraries/mbed/api/DirHandle.h

   1 /* mbed Microcontroller Library
   2  * Copyright (c) 2006-2013 ARM Limited
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 #ifndef MBED_DIRHANDLE_H
  17 #define MBED_DIRHANDLE_H
  18
  19 #if defined(__ARMCC_VERSION) || defined(__ICCARM__)
  20 #   define NAME_MAX 255
  21 typedef int mode_t;
  22
  23 #else
  24 #   include <sys/syslimits.h>
  25 #endif
  26
  27 #include "FileHandle.h"
  28
  29 struct dirent {
  30     char d_name[NAME_MAX+1];
  31 };
  32
  33 namespace mbed {
  34
  35 /** Represents a directory stream. Objects of this type are returned
  36  *  by a FileSystemLike's opendir method. Implementations must define
  37  *  at least closedir, readdir and rewinddir.
  38  *
  39  *  If a FileSystemLike class defines the opendir method, then the
  40  *  directories of an object of that type can be accessed by
  41  *  DIR *d = opendir("/example/directory") (or opendir("/example")
  42  *  to open the root of the filesystem), and then using readdir(d) etc.
  43  *
  44  *  The root directory is considered to contain all FileLike and
  45  *  FileSystemLike objects, so the DIR* returned by opendir("/") will
  46  *  reflect this.
  47  */
  48 class DirHandle {
  49
  50 public:
  51     /** Closes the directory.
  52      *
  53      *  @returns
  54      *    0 on success,
  55      *   -1 on error.
  56      */
  57     virtual int closedir()=0;
  58
  59     /** Return the directory entry at the current position, and
  60      *  advances the position to the next entry.
  61      *
  62      * @returns
  63      *  A pointer to a dirent structure representing the
  64      *  directory entry at the current position, or NULL on reaching
  65      *  end of directory or error.
  66      */
  67     virtual struct dirent *readdir()=0;
  68
  69     /** Resets the position to the beginning of the directory.
  70      */
  71     virtual void rewinddir()=0;
  72
  73     /** Returns the current position of the DirHandle.
  74      *
  75      * @returns
  76      *   the current position,
  77      *  -1 on error.
  78      */
  79     virtual off_t telldir() { return -1; }
  80
  81     /** Sets the position of the DirHandle.
  82      *
  83      *  @param location The location to seek to. Must be a value returned by telldir.
  84      */
  85     virtual void seekdir(off_t location) { }
  86
  87     virtual ~DirHandle() {}
  88 };
  89
  90 } // namespace mbed
  91
  92 typedef mbed::DirHandle DIR;
  93
  94 extern "C" {
  95     DIR *opendir(const char*);
  96     struct dirent *readdir(DIR *);
  97     int closedir(DIR*);
  98     void rewinddir(DIR*);
  99     long telldir(DIR*);
 100     void seekdir(DIR*, long);
 101     int mkdir(const char *name, mode_t n);
 102 };
 103
 104 #endif /* MBED_DIRHANDLE_H */