FATFS 初学之 f_mkdir/ unlink
2014-08-14 10:13 Danhuise 阅读(6649) 评论(0) 编辑 收藏 举报f_mkdir：
1 /*-----------------------------------------------------------------------*/ 2 /* Create a Directory */ 3 /*-----------------------------------------------------------------------*/ 4 5 FRESULT f_mkdir ( 6 const TCHAR *path /* Pointer to the directory path */ 7 ) 8 { 9 FRESULT res; 10 DIR dj; 11 BYTE *dir, n; 12 DWORD dsc, dcl, pcl, tim = get_fattime(); 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 if (res == FR_OK) res = FR_EXIST; /* Any object with same name is already existing */ 21 if (_FS_RPATH && res == FR_NO_FILE && (dj.fn[NS] & NS_DOT)) 22 res = FR_INVALID_NAME; 23 if (res == FR_NO_FILE) { /* Can create a new directory */ 24 dcl = create_chain(dj.fs, 0); /* Allocate a cluster for the new directory table */ 25 res = FR_OK; 26 if (dcl == 0) res = FR_DENIED; /* No space to allocate a new cluster */ 27 if (dcl == 1) res = FR_INT_ERR; 28 if (dcl == 0xFFFFFFFF) res = FR_DISK_ERR; 29 if (res == FR_OK) /* Flush FAT */ 30 res = move_window(dj.fs, 0); 31 if (res == FR_OK) { /* Initialize the new directory table */ 32 dsc = clust2sect(dj.fs, dcl); 33 dir = dj.fs->win; 34 mem_set(dir, 0, SS(dj.fs)); 35 mem_set(dir+DIR_Name, ' ', 8+3); /* Create "." entry */ 36 dir[DIR_Name] = '.'; 37 dir[DIR_Attr] = AM_DIR; 38 ST_DWORD(dir+DIR_WrtTime, tim); 39 ST_CLUST(dir, dcl); 40 mem_cpy(dir+SZ_DIR, dir, SZ_DIR); /* Create ".." entry */ 41 dir[33] = '.'; pcl = dj.sclust; 42 if (dj.fs->fs_type == FS_FAT32 && pcl == dj.fs->dirbase) 43 pcl = 0; 44 ST_CLUST(dir+SZ_DIR, pcl); 45 for (n = dj.fs->csize; n; n--) { /* Write dot entries and clear following sectors */ 46 dj.fs->winsect = dsc++; 47 dj.fs->wflag = 1; 48 res = move_window(dj.fs, 0); 49 if (res != FR_OK) break; 50 mem_set(dir, 0, SS(dj.fs)); 51 } 52 } 53 if (res == FR_OK) res = dir_register(&dj); /* Register the object to the directoy */ 54 if (res != FR_OK) { 55 remove_chain(dj.fs, dcl); /* Could not register, remove cluster chain */ 56 } else { 57 dir = dj.dir; 58 dir[DIR_Attr] = AM_DIR; /* Attribute */ 59 ST_DWORD(dir+DIR_WrtTime, tim); /* Created time */ 60 ST_CLUST(dir, dcl); /* Table start cluster */ 61 dj.fs->wflag = 1; 62 res = sync(dj.fs); 63 } 64 } 65 FREE_BUF(); 66 } 67 68 LEAVE_FF(dj.fs, res); 69 }
函数功能：创建一个目录
描述：
f_mkdir函数当_FS_READONLY == 0并且_FS_MINIMIZE == 0时可用。
f_mkdir函数创建一个新目录。
f_unlink：
1 /*-----------------------------------------------------------------------*/ 2 /* Delete a File or Directory */ 3 /*-----------------------------------------------------------------------*/ 4 5 FRESULT f_unlink ( 6 const TCHAR *path /* Pointer to the file or directory path */ 7 ) 8 { 9 FRESULT res; 10 DIR dj, sdj; 11 BYTE *dir; 12 DWORD dclst; 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 if (_FS_RPATH && res == FR_OK && (dj.fn[NS] & NS_DOT)) 21 res = FR_INVALID_NAME; /* Cannot remove dot entry */ 22 #if _FS_SHARE 23 if (res == FR_OK) res = chk_lock(&dj, 2); /* Cannot remove open file */ 24 #endif 25 if (res == FR_OK) { /* The object is accessible */ 26 dir = dj.dir; 27 if (!dir) { 28 res = FR_INVALID_NAME; /* Cannot remove the start directory */ 29 } else { 30 if (dir[DIR_Attr] & AM_RDO) 31 res = FR_DENIED; /* Cannot remove R/O object */ 32 } 33 dclst = LD_CLUST(dir); 34 if (res == FR_OK && (dir[DIR_Attr] & AM_DIR)) { /* Is it a sub-dir? */ 35 if (dclst < 2) { 36 res = FR_INT_ERR; 37 } else { 38 mem_cpy(&sdj, &dj, sizeof(DIR)); /* Check if the sub-dir is empty or not */ 39 sdj.sclust = dclst; 40 res = dir_sdi(&sdj, 2); /* Exclude dot entries */ 41 if (res == FR_OK) { 42 res = dir_read(&sdj); 43 if (res == FR_OK /* Not empty dir */ 44 #if _FS_RPATH 45 || dclst == sdj.fs->cdir /* Current dir */ 46 #endif 47 ) res = FR_DENIED; 48 if (res == FR_NO_FILE) res = FR_OK; /* Empty */ 49 } 50 } 51 } 52 if (res == FR_OK) { 53 res = dir_remove(&dj); /* Remove the directory entry */ 54 if (res == FR_OK) { 55 if (dclst) /* Remove the cluster chain if exist */ 56 res = remove_chain(dj.fs, dclst); 57 if (res == FR_OK) res = sync(dj.fs); 58 } 59 } 60 } 61 FREE_BUF(); 62 } 63 LEAVE_FF(dj.fs, res); 64 }
函数功能：移除一个对象
描述：
f_unlink函数当_FS_READONLY == 0并且_FS_MINIMIZE == 0时可用。
f_unlink函数移除一个对象。不要移除打开的对象或当前目录。
例：
1 res = f_mkdir("sub1"); // 在根目录下创建 sub1目录 2 if (res) die(res); 3 res = f_mkdir("sub1/sub2"); // 在 sub1目录下创建 sub2目录 4 if (res) die(res); 5 res = f_mkdir("sub1/sub2/sub3"); 6 if (res) die(res); 7 // ... 8 f_unlink("SD.txt"); //删除跟目录下文件 SD.txt
