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circuitpython/shared-module/os/__init__.c

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/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 Damien P. George
* Copyright (c) 2015 Josef Gajdusek
* Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <string.h>
#include "extmod/vfs.h"
#include "py/mperrno.h"
#include "py/mpstate.h"
#include "py/obj.h"
#include "py/objstr.h"
#include "py/runtime.h"
#include "shared-bindings/os/__init__.h"
// This provides all VFS related OS functions so that ports can share the code
// as needed. It does not provide uname.
// Version of mp_vfs_lookup_path that takes and returns uPy string objects.
STATIC mp_vfs_mount_t *lookup_path(const char* path, mp_obj_t *path_out) {
const char *p_out;
mp_vfs_mount_t *vfs = mp_vfs_lookup_path(path, &p_out);
if (vfs != MP_VFS_NONE && vfs != MP_VFS_ROOT) {
*path_out = mp_obj_new_str_of_type(&mp_type_str,
(const byte*)p_out, strlen(p_out));
}
return vfs;
}
STATIC mp_obj_t mp_vfs_proxy_call(mp_vfs_mount_t *vfs, qstr meth_name, size_t n_args, const mp_obj_t *args) {
if (vfs == MP_VFS_NONE) {
// mount point not found
mp_raise_OSError(MP_ENODEV);
}
if (vfs == MP_VFS_ROOT) {
// can't do operation on root dir
mp_raise_OSError(MP_EPERM);
}
mp_obj_t meth[n_args + 2];
mp_load_method(vfs->obj, meth_name, meth);
if (args != NULL) {
memcpy(meth + 2, args, n_args * sizeof(*args));
}
return mp_call_method_n_kw(n_args, 0, meth);
}
void common_hal_os_chdir(const char* path) {
mp_obj_t path_out;
mp_vfs_mount_t *vfs = lookup_path(path, &path_out);
MP_STATE_VM(vfs_cur) = vfs;
if (vfs == MP_VFS_ROOT) {
// If we change to the root dir and a VFS is mounted at the root then
// we must change that VFS's current dir to the root dir so that any
// subsequent relative paths begin at the root of that VFS.
for (vfs = MP_STATE_VM(vfs_mount_table); vfs != NULL; vfs = vfs->next) {
if (vfs->len == 1) {
mp_obj_t root = mp_obj_new_str("/", 1);
mp_vfs_proxy_call(vfs, MP_QSTR_chdir, 1, &root);
break;
}
}
} else {
mp_vfs_proxy_call(vfs, MP_QSTR_chdir, 1, &path_out);
}
}
mp_obj_t common_hal_os_getcwd(void) {
return mp_vfs_getcwd();
}
mp_obj_t common_hal_os_listdir(const char* path) {
mp_obj_t path_out;
mp_vfs_mount_t *vfs = lookup_path(path, &path_out);
mp_vfs_ilistdir_it_t iter;
mp_obj_t iter_obj = MP_OBJ_FROM_PTR(&iter);
if (vfs == MP_VFS_ROOT) {
// list the root directory
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 = true;
iter.is_iter = false;
} else {
iter_obj = mp_vfs_proxy_call(vfs, MP_QSTR_ilistdir, 1, &path_out);
}
mp_obj_t dir_list = mp_obj_new_list(0, NULL);
mp_obj_t next;
while ((next = mp_iternext(iter_obj)) != MP_OBJ_STOP_ITERATION) {
// next[0] is the filename.
mp_obj_list_append(dir_list, mp_obj_subscr(next, MP_OBJ_NEW_SMALL_INT(0), MP_OBJ_SENTINEL));
}
return dir_list;
}
void common_hal_os_mkdir(const char* path) {
mp_obj_t path_out;
mp_vfs_mount_t *vfs = lookup_path(path, &path_out);
if (vfs == MP_VFS_ROOT || (vfs != MP_VFS_NONE && !strcmp(mp_obj_str_get_str(path_out), "/"))) {
mp_raise_OSError(MP_EEXIST);
}
mp_vfs_proxy_call(vfs, MP_QSTR_mkdir, 1, &path_out);
}
void common_hal_os_remove(const char* path) {
mp_obj_t path_out;
mp_vfs_mount_t *vfs = lookup_path(path, &path_out);
mp_vfs_proxy_call(vfs, MP_QSTR_remove, 1, &path_out);
}
void common_hal_os_rename(const char* old_path, const char* new_path) {
mp_obj_t args[2];
mp_vfs_mount_t *old_vfs = lookup_path(old_path, &args[0]);
mp_vfs_mount_t *new_vfs = lookup_path(new_path, &args[1]);
if (old_vfs != new_vfs) {
// can't rename across filesystems
mp_raise_OSError(MP_EPERM);
}
mp_vfs_proxy_call(old_vfs, MP_QSTR_rename, 2, args);
}
void common_hal_os_rmdir(const char* path) {
mp_obj_t path_out;
mp_vfs_mount_t *vfs = lookup_path(path, &path_out);
mp_vfs_proxy_call(vfs, MP_QSTR_rmdir, 1, &path_out);
}
mp_obj_t common_hal_os_stat(const char* path) {
mp_obj_t path_out;
mp_vfs_mount_t *vfs = lookup_path(path, &path_out);
if (vfs == MP_VFS_ROOT) {
mp_obj_tuple_t *t = MP_OBJ_TO_PTR(mp_obj_new_tuple(10, NULL));
t->items[0] = MP_OBJ_NEW_SMALL_INT(MP_S_IFDIR); // st_mode
for (int i = 1; i <= 9; ++i) {
t->items[i] = MP_OBJ_NEW_SMALL_INT(0); // dev, nlink, uid, gid, size, atime, mtime, ctime
}
return MP_OBJ_FROM_PTR(t);
}
return mp_vfs_proxy_call(vfs, MP_QSTR_stat, 1, &path_out);
}
mp_obj_t common_hal_os_statvfs(const char* path) {
mp_obj_t path_out;
mp_vfs_mount_t *vfs = lookup_path(path, &path_out);
if (vfs == MP_VFS_ROOT) {
// statvfs called on the root directory, see if there's anything mounted there
for (vfs = MP_STATE_VM(vfs_mount_table); vfs != NULL; vfs = vfs->next) {
if (vfs->len == 1) {
break;
}
}
// If there's nothing mounted at root then return a mostly-empty tuple
if (vfs == NULL) {
mp_obj_tuple_t *t = MP_OBJ_TO_PTR(mp_obj_new_tuple(10, NULL));
// fill in: bsize, frsize, blocks, bfree, bavail, files, ffree, favail, flags
for (int i = 0; i <= 8; ++i) {
t->items[i] = MP_OBJ_NEW_SMALL_INT(0);
}
// Put something sensible in f_namemax
t->items[9] = MP_OBJ_NEW_SMALL_INT(MICROPY_ALLOC_PATH_MAX);
return MP_OBJ_FROM_PTR(t);
}
// VFS mounted at root so delegate the call to it
path_out = MP_OBJ_NEW_QSTR(MP_QSTR__slash_);
}
return mp_vfs_proxy_call(vfs, MP_QSTR_statvfs, 1, &path_out);
}