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extmod/vfs: Implement mp_vfs_ilistdir(). 

uos.ilistdir() is the core function, returning an iterator that yields
3-tuples.  uos.listdir() is implemented in terms of ilistdir().
This commit is contained in:
Damien George 2017-05-05 23:31:51 +10:00
parent edc02bd952
commit 87283c1974
2 changed files with 70 additions and 15 deletions
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79
extmod/vfs.c
View File

@ -286,7 +286,49 @@ mp_obj_t mp_vfs_getcwd(void) {
}
MP_DEFINE_CONST_FUN_OBJ_0(mp_vfs_getcwd_obj, mp_vfs_getcwd);
mp_obj_t mp_vfs_listdir(size_t n_args, const mp_obj_t *args) {
typedef struct _mp_vfs_ilistdir_it_t {
mp_obj_base_t base;
mp_fun_1_t iternext;
union {
mp_vfs_mount_t *vfs;
mp_obj_t iter;
} cur;
bool is_str;
bool is_iter;
} mp_vfs_ilistdir_it_t;
STATIC mp_obj_t mp_vfs_ilistdir_it_iternext(mp_obj_t self_in) {
mp_vfs_ilistdir_it_t *self = MP_OBJ_TO_PTR(self_in);
if (self->is_iter) {
// continue delegating to root dir
return mp_iternext(self->cur.iter);
} else if (self->cur.vfs == NULL) {
// finished iterating mount points and no root dir is mounted
return MP_OBJ_STOP_ITERATION;
} else {
// continue iterating mount points
mp_vfs_mount_t *vfs = self->cur.vfs;
self->cur.vfs = vfs->next;
if (vfs->len == 1) {
// vfs is mounted at root dir, delegate to it
mp_obj_t root = mp_obj_new_str("/", 1, false);
self->is_iter = true;
self->cur.iter = mp_vfs_proxy_call(vfs, MP_QSTR_ilistdir, 1, &root);
return mp_iternext(self->cur.iter);
} else {
// a mounted directory
mp_obj_tuple_t *t = MP_OBJ_TO_PTR(mp_obj_new_tuple(3, NULL));
t->items[0] = mp_obj_new_str_of_type(
self->is_str ? &mp_type_str : &mp_type_bytes,
(const byte*)vfs->str + 1, vfs->len - 1);
t->items[1] = MP_OBJ_NEW_SMALL_INT(MP_S_IFDIR);
t->items[2] = MP_OBJ_NEW_SMALL_INT(0); // no inode number
return MP_OBJ_FROM_PTR(t);
}
}
}
mp_obj_t mp_vfs_ilistdir(size_t n_args, const mp_obj_t *args) {
mp_obj_t path_in;
if (n_args == 1) {
path_in = args[0];
@ -299,22 +341,29 @@ mp_obj_t mp_vfs_listdir(size_t n_args, const mp_obj_t *args) {
if (vfs == MP_VFS_ROOT) {
// list the root directory
mp_obj_t dir_list = mp_obj_new_list(0, NULL);
for (vfs = MP_STATE_VM(vfs_mount_table); vfs != NULL; vfs = vfs->next) {
if (vfs->len == 1) {
// vfs is mounted at root dir, delegate to it
mp_obj_t root = mp_obj_new_str("/", 1, false);
mp_obj_t dir_list2 = mp_vfs_proxy_call(vfs, MP_QSTR_listdir, 1, &root);
dir_list = mp_binary_op(MP_BINARY_OP_ADD, dir_list, dir_list2);
} else {
mp_obj_list_append(dir_list, mp_obj_new_str_of_type(mp_obj_get_type(path_in),
(const byte*)vfs->str + 1, vfs->len - 1));
}
}
return dir_list;
mp_vfs_ilistdir_it_t *iter = m_new_obj(mp_vfs_ilistdir_it_t);
iter->base.type = &mp_type_polymorph_iter;
iter->iternext = mp_vfs_ilistdir_it_iternext;
iter->cur.vfs = MP_STATE_VM(vfs_mount_table);
iter->is_str = mp_obj_get_type(path_in) == &mp_type_str;
iter->is_iter = false;
return MP_OBJ_FROM_PTR(iter);
}
return mp_vfs_proxy_call(vfs, MP_QSTR_listdir, 1, &path_out);
return mp_vfs_proxy_call(vfs, MP_QSTR_ilistdir, 1, &path_out);
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_vfs_ilistdir_obj, 0, 1, mp_vfs_ilistdir);
mp_obj_t mp_vfs_listdir(size_t n_args, const mp_obj_t *args) {
mp_obj_t iter = mp_vfs_ilistdir(n_args, args);
mp_obj_t dir_list = mp_obj_new_list(0, NULL);
mp_obj_t next;
while ((next = mp_iternext(iter)) != MP_OBJ_STOP_ITERATION) {
mp_obj_t *items;
mp_obj_get_array_fixed_n(next, 3, &items);
mp_obj_list_append(dir_list, items[0]);
}
return dir_list;
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_vfs_listdir_obj, 0, 1, mp_vfs_listdir);

6
extmod/vfs.h
View File

@ -35,6 +35,10 @@
#define MP_VFS_NONE ((mp_vfs_mount_t*)1)
#define MP_VFS_ROOT ((mp_vfs_mount_t*)0)
// MicroPython's port-standardized versions of stat constants
#define MP_S_IFDIR (0x4000)
#define MP_S_IFREG (0x8000)
// constants for block protocol ioctl
#define BP_IOCTL_INIT (1)
#define BP_IOCTL_DEINIT (2)
@ -56,6 +60,7 @@ mp_obj_t mp_vfs_umount(mp_obj_t mnt_in);
mp_obj_t mp_vfs_open(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args);
mp_obj_t mp_vfs_chdir(mp_obj_t path_in);
mp_obj_t mp_vfs_getcwd(void);
mp_obj_t mp_vfs_ilistdir(size_t n_args, const mp_obj_t *args);
mp_obj_t mp_vfs_listdir(size_t n_args, const mp_obj_t *args);
mp_obj_t mp_vfs_mkdir(mp_obj_t path_in);
mp_obj_t mp_vfs_remove(mp_obj_t path_in);
@ -69,6 +74,7 @@ MP_DECLARE_CONST_FUN_OBJ_1(mp_vfs_umount_obj);
MP_DECLARE_CONST_FUN_OBJ_KW(mp_vfs_open_obj);
MP_DECLARE_CONST_FUN_OBJ_1(mp_vfs_chdir_obj);
MP_DECLARE_CONST_FUN_OBJ_0(mp_vfs_getcwd_obj);
MP_DECLARE_CONST_FUN_OBJ_VAR_BETWEEN(mp_vfs_ilistdir_obj);
MP_DECLARE_CONST_FUN_OBJ_VAR_BETWEEN(mp_vfs_listdir_obj);
MP_DECLARE_CONST_FUN_OBJ_1(mp_vfs_mkdir_obj);
MP_DECLARE_CONST_FUN_OBJ_1(mp_vfs_remove_obj);