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DirHandle.h
00001 /* mbed Microcontroller Library - DirHandler 00002 * Copyright (c) 2008-2009 ARM Limited. All rights reserved. 00003 */ 00004 00005 #ifndef MBED_DIRHANDLE_H 00006 #define MBED_DIRHANDLE_H 00007 00008 #ifdef __ARMCC_VERSION 00009 # define NAME_MAX 255 00010 typedef int mode_t; 00011 #else 00012 # include <sys/syslimits.h> 00013 #endif 00014 #include "FileHandle.h" 00015 00016 struct dirent { 00017 char d_name[NAME_MAX+1]; 00018 }; 00019 00020 namespace mbed { 00021 00022 /* Class DirHandle 00023 * Represents a directory stream. Objects of this type are returned 00024 * by a FileSystemLike's opendir method. Implementations must define 00025 * at least closedir, readdir and rewinddir. 00026 * 00027 * If a FileSystemLike class defines the opendir method, then the 00028 * directories of an object of that type can be accessed by 00029 * DIR *d = opendir("/example/directory") (or opendir("/example") 00030 * to open the root of the filesystem), and then using readdir(d) etc. 00031 * 00032 * The root directory is considered to contain all FileLike and 00033 * FileSystemLike objects, so the DIR* returned by opendir("/") will 00034 * reflect this. 00035 */ 00036 class DirHandle { 00037 00038 public: 00039 /* Function closedir 00040 * Closes the directory. 00041 * 00042 * Variables 00043 * returns - 0 on success, or -1 on error. 00044 */ 00045 virtual int closedir()=0; 00046 00047 /* Function readdir 00048 * Return the directory entry at the current position, and 00049 * advances the position to the next entry. 00050 * 00051 * Returns 00052 * A pointer to a dirent structure representing the 00053 * directory entry at the current position, or NULL on reaching 00054 * end of directory or error. 00055 */ 00056 virtual struct dirent *readdir()=0; 00057 00058 /* Function rewinddir 00059 * Resets the position to the beginning of the directory. 00060 */ 00061 virtual void rewinddir()=0; 00062 00063 /* Function telldir 00064 * Returns the current position of the DirHandle. 00065 * 00066 * Returns 00067 * The current position, or -1 on error. 00068 */ 00069 virtual off_t telldir() { return -1; } 00070 00071 /* Function seekdir 00072 * Sets the position of the DirHandle. 00073 * 00074 * Variables 00075 * location - The location to seek to. Must be a value returned 00076 * by telldir. 00077 */ 00078 virtual void seekdir(off_t location) { } 00079 00080 }; 00081 00082 } // namespace mbed 00083 00084 typedef mbed::DirHandle DIR; 00085 00086 extern "C" { 00087 DIR *opendir(const char*); 00088 struct dirent *readdir(DIR *); 00089 int closedir(DIR*); 00090 void rewinddir(DIR*); 00091 long telldir(DIR*); 00092 void seekdir(DIR*, long); 00093 int mkdir(const char *name, mode_t n); 00094 }; 00095 00096 #endif /* MBED_DIRHANDLE_H */
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