F_chmod/f_utime for beginners of fatfs

F_chmod:

 1 /*-----------------------------------------------------------------------*/ 2 /* Change Attribute                                                      */ 3 /*-----------------------------------------------------------------------*/ 4  5 FRESULT f_chmod ( 6     const TCHAR *path,    /* Pointer to the file path */ 7     BYTE value,            /* Attribute bits */ 8     BYTE mask            /* Attribute mask to change */ 9 )10 {11     FRESULT res;12     DIR dj;13     BYTE *dir;14     DEF_NAMEBUF;15 16 17     res = chk_mounted(&path, &dj.fs, 1);18     if (res == FR_OK) {19         INIT_BUF(dj);20         res = follow_path(&dj, path);        /* Follow the file path */21         FREE_BUF();22         if (_FS_RPATH && res == FR_OK && (dj.fn[NS] & NS_DOT))23             res = FR_INVALID_NAME;24         if (res == FR_OK) {25             dir = dj.dir;26             if (!dir) {                        /* Is it a root directory? */27                 res = FR_INVALID_NAME;28             } else {                        /* File or sub directory */29                 mask &= AM_RDO|AM_HID|AM_SYS|AM_ARC;    /* Valid attribute mask */30                 dir[DIR_Attr] = (value & mask) | (dir[DIR_Attr] & (BYTE)~mask);    /* Apply attribute change */31                 dj.fs->wflag = 1;32                 res = sync(dj.fs);33             }34         }35     }36 37     LEAVE_FF(dj.fs, res);38 }

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Function: modifies the attributes of a file or directory.

Description:

The f_chmod function is available when _ fs_readonly = 0 and _ fs_minimize = 0.
The f_chmod function modifies the attributes of a file or directory.

 

F_utime:

 1 /*-----------------------------------------------------------------------*/ 2 /* Change Timestamp                                                      */ 3 /*-----------------------------------------------------------------------*/ 4  5 FRESULT f_utime ( 6     const TCHAR *path,    /* Pointer to the file/directory name */ 7     const FILINFO *fno    /* Pointer to the time stamp to be set */ 8 ) 9 {10     FRESULT res;11     DIR dj;12     BYTE *dir;13     DEF_NAMEBUF;14 15 16     res = chk_mounted(&path, &dj.fs, 1);17     if (res == FR_OK) {18         INIT_BUF(dj);19         res = follow_path(&dj, path);    /* Follow the file path */20         FREE_BUF();21         if (_FS_RPATH && res == FR_OK && (dj.fn[NS] & NS_DOT))22             res = FR_INVALID_NAME;23         if (res == FR_OK) {24             dir = dj.dir;25             if (!dir) {                    /* Root directory */26                 res = FR_INVALID_NAME;27             } else {                    /* File or sub-directory */28                 ST_WORD(dir+DIR_WrtTime, fno->ftime);29                 ST_WORD(dir+DIR_WrtDate, fno->fdate);30                 dj.fs->wflag = 1;31                 res = sync(dj.fs);32             }33         }34     }35 36     LEAVE_FF(dj.fs, res);37 }

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Function: The f_utime function modifies the timestamp of a file or directory.

Description:

The f_utime function is available when _ fs_readonly = 0 and _ fs_minimize = 0.
The f_utime function modifies the timestamp of a file or directory (that is, the creation, modification, and access time in the file attribute ).

 

Example:

1 // set the read-only flag to clear the archive flag. Other flags remain unchanged. 2 f_chmod ("file.txt", ar_rdo, ar_rdo | ar_arc );

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