Jing Qiu / mbed

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Fork of mbed by gokmen ascioglu

DirHandle.h@1:27d81db81dd7, 2015-03-03 (annotated)

Committer:
Jing_Qiu
Date:
Tue Mar 03 00:55:57 2015 +0000
Revision:
1:27d81db81dd7
Parent:
0:a8fa94490a0a 
revise

Who changed what in which revision?

UserRevisionLine numberNew contents of line
gokmenascioglu 0:a8fa94490a0a 1 /* mbed Microcontroller Library - DirHandler
gokmenascioglu 0:a8fa94490a0a 2 * Copyright (c) 2008-2009 ARM Limited. All rights reserved.
gokmenascioglu 0:a8fa94490a0a 3 */
gokmenascioglu 0:a8fa94490a0a 4
gokmenascioglu 0:a8fa94490a0a 5 #ifndef MBED_DIRHANDLE_H
gokmenascioglu 0:a8fa94490a0a 6 #define MBED_DIRHANDLE_H
gokmenascioglu 0:a8fa94490a0a 7
gokmenascioglu 0:a8fa94490a0a 8 #ifdef __ARMCC_VERSION
gokmenascioglu 0:a8fa94490a0a 9 # define NAME_MAX 255
gokmenascioglu 0:a8fa94490a0a 10 typedef int mode_t;
gokmenascioglu 0:a8fa94490a0a 11 #else
gokmenascioglu 0:a8fa94490a0a 12 # include <sys/syslimits.h>
gokmenascioglu 0:a8fa94490a0a 13 #endif
gokmenascioglu 0:a8fa94490a0a 14 #include "FileHandle.h"
gokmenascioglu 0:a8fa94490a0a 15
gokmenascioglu 0:a8fa94490a0a 16 struct dirent {
gokmenascioglu 0:a8fa94490a0a 17 char d_name[NAME_MAX+1];
gokmenascioglu 0:a8fa94490a0a 18 };
gokmenascioglu 0:a8fa94490a0a 19
gokmenascioglu 0:a8fa94490a0a 20 namespace mbed {
gokmenascioglu 0:a8fa94490a0a 21
gokmenascioglu 0:a8fa94490a0a 22 /* Class DirHandle
gokmenascioglu 0:a8fa94490a0a 23 * Represents a directory stream. Objects of this type are returned
gokmenascioglu 0:a8fa94490a0a 24 * by a FileSystemLike's opendir method. Implementations must define
gokmenascioglu 0:a8fa94490a0a 25 * at least closedir, readdir and rewinddir.
gokmenascioglu 0:a8fa94490a0a 26 *
gokmenascioglu 0:a8fa94490a0a 27 * If a FileSystemLike class defines the opendir method, then the
gokmenascioglu 0:a8fa94490a0a 28 * directories of an object of that type can be accessed by
gokmenascioglu 0:a8fa94490a0a 29 * DIR *d = opendir("/example/directory") (or opendir("/example")
gokmenascioglu 0:a8fa94490a0a 30 * to open the root of the filesystem), and then using readdir(d) etc.
gokmenascioglu 0:a8fa94490a0a 31 *
gokmenascioglu 0:a8fa94490a0a 32 * The root directory is considered to contain all FileLike and
gokmenascioglu 0:a8fa94490a0a 33 * FileSystemLike objects, so the DIR* returned by opendir("/") will
gokmenascioglu 0:a8fa94490a0a 34 * reflect this.
gokmenascioglu 0:a8fa94490a0a 35 */
gokmenascioglu 0:a8fa94490a0a 36 class DirHandle {
gokmenascioglu 0:a8fa94490a0a 37
gokmenascioglu 0:a8fa94490a0a 38 public:
gokmenascioglu 0:a8fa94490a0a 39 /* Function closedir
gokmenascioglu 0:a8fa94490a0a 40 * Closes the directory.
gokmenascioglu 0:a8fa94490a0a 41 *
gokmenascioglu 0:a8fa94490a0a 42 * Variables
gokmenascioglu 0:a8fa94490a0a 43 * returns - 0 on success, or -1 on error.
gokmenascioglu 0:a8fa94490a0a 44 */
gokmenascioglu 0:a8fa94490a0a 45 virtual int closedir()=0;
gokmenascioglu 0:a8fa94490a0a 46
gokmenascioglu 0:a8fa94490a0a 47 /* Function readdir
gokmenascioglu 0:a8fa94490a0a 48 * Return the directory entry at the current position, and
gokmenascioglu 0:a8fa94490a0a 49 * advances the position to the next entry.
gokmenascioglu 0:a8fa94490a0a 50 *
gokmenascioglu 0:a8fa94490a0a 51 * Returns
gokmenascioglu 0:a8fa94490a0a 52 * A pointer to a dirent structure representing the
gokmenascioglu 0:a8fa94490a0a 53 * directory entry at the current position, or NULL on reaching
gokmenascioglu 0:a8fa94490a0a 54 * end of directory or error.
gokmenascioglu 0:a8fa94490a0a 55 */
gokmenascioglu 0:a8fa94490a0a 56 virtual struct dirent *readdir()=0;
gokmenascioglu 0:a8fa94490a0a 57
gokmenascioglu 0:a8fa94490a0a 58 /* Function rewinddir
gokmenascioglu 0:a8fa94490a0a 59 * Resets the position to the beginning of the directory.
gokmenascioglu 0:a8fa94490a0a 60 */
gokmenascioglu 0:a8fa94490a0a 61 virtual void rewinddir()=0;
gokmenascioglu 0:a8fa94490a0a 62
gokmenascioglu 0:a8fa94490a0a 63 /* Function telldir
gokmenascioglu 0:a8fa94490a0a 64 * Returns the current position of the DirHandle.
gokmenascioglu 0:a8fa94490a0a 65 *
gokmenascioglu 0:a8fa94490a0a 66 * Returns
gokmenascioglu 0:a8fa94490a0a 67 * The current position, or -1 on error.
gokmenascioglu 0:a8fa94490a0a 68 */
gokmenascioglu 0:a8fa94490a0a 69 virtual off_t telldir() { return -1; }
gokmenascioglu 0:a8fa94490a0a 70
gokmenascioglu 0:a8fa94490a0a 71 /* Function seekdir
gokmenascioglu 0:a8fa94490a0a 72 * Sets the position of the DirHandle.
gokmenascioglu 0:a8fa94490a0a 73 *
gokmenascioglu 0:a8fa94490a0a 74 * Variables
gokmenascioglu 0:a8fa94490a0a 75 * location - The location to seek to. Must be a value returned
gokmenascioglu 0:a8fa94490a0a 76 * by telldir.
gokmenascioglu 0:a8fa94490a0a 77 */
gokmenascioglu 0:a8fa94490a0a 78 virtual void seekdir(off_t location) { }
gokmenascioglu 0:a8fa94490a0a 79
gokmenascioglu 0:a8fa94490a0a 80 };
gokmenascioglu 0:a8fa94490a0a 81
gokmenascioglu 0:a8fa94490a0a 82 } // namespace mbed
gokmenascioglu 0:a8fa94490a0a 83
gokmenascioglu 0:a8fa94490a0a 84 typedef mbed::DirHandle DIR;
gokmenascioglu 0:a8fa94490a0a 85
gokmenascioglu 0:a8fa94490a0a 86 extern "C" {
gokmenascioglu 0:a8fa94490a0a 87 DIR *opendir(const char*);
gokmenascioglu 0:a8fa94490a0a 88 struct dirent *readdir(DIR *);
gokmenascioglu 0:a8fa94490a0a 89 int closedir(DIR*);
gokmenascioglu 0:a8fa94490a0a 90 void rewinddir(DIR*);
gokmenascioglu 0:a8fa94490a0a 91 long telldir(DIR*);
gokmenascioglu 0:a8fa94490a0a 92 void seekdir(DIR*, long);
gokmenascioglu 0:a8fa94490a0a 93 int mkdir(const char *name, mode_t n);
gokmenascioglu 0:a8fa94490a0a 94 };
gokmenascioglu 0:a8fa94490a0a 95
gokmenascioglu 0:a8fa94490a0a 96 #endif /* MBED_DIRHANDLE_H */