FATFS 初学之 f_opendir/ f_readdir

f_opendir：

 1 /*-----------------------------------------------------------------------*/
 2 /* Create a Directroy Object                                             */
 3 /*-----------------------------------------------------------------------*/
 4 
 5 FRESULT f_opendir (
 6     DIR *dj,            /* Pointer to directory object to create */
 7     const TCHAR *path    /* Pointer to the directory path */
 8 )
 9 {
10     FRESULT res;
11     DEF_NAMEBUF;
12 
13 
14     res = chk_mounted(&path, &dj->fs, 0);
15     if (res == FR_OK) {
16         INIT_BUF(*dj);
17         res = follow_path(dj, path);            /* Follow the path to the directory */
18         FREE_BUF();
19         if (res == FR_OK) {                        /* Follow completed */
20             if (dj->dir) {                        /* It is not the root dir */
21                 if (dj->dir[DIR_Attr] & AM_DIR) {    /* The object is a directory */
22                     dj->sclust = LD_CLUST(dj->dir);
23                 } else {                        /* The object is not a directory */
24                     res = FR_NO_PATH;
25                 }
26             }
27             if (res == FR_OK) {
28                 dj->id = dj->fs->id;
29                 res = dir_sdi(dj, 0);            /* Rewind dir */
30             }
31         }
32         if (res == FR_NO_FILE) res = FR_NO_PATH;
33     }
34 
35     LEAVE_FF(dj->fs, res);
36 }

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