370 lines
12 KiB
C
370 lines
12 KiB
C
/*
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* This file is part of the Micro Python project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2013, 2014 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdint.h>
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#include <string.h>
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#include "mpconfig.h"
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#include "nlr.h"
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#include "misc.h"
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#include "qstr.h"
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#include "obj.h"
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#include "objtuple.h"
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#include "systick.h"
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#include "rng.h"
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#include "storage.h"
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#include "ff.h"
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#include "file.h"
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#include "sdcard.h"
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#include "portmodules.h"
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/// \module os - basic "operating system" services
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///
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/// The `os` module contains functions for filesystem access and `urandom`.
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///
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/// The filesystem has `/` as the root directory, and the available physical
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/// drives are accessible from here. They are currently:
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///
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/// /flash -- the internal flash filesystem
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/// /sd -- the SD card (if it exists)
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///
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/// On boot up, the current directory is `/flash` if no SD card is inserted,
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/// otherwise it is `/sd`.
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#if _USE_LFN
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static char lfn[_MAX_LFN + 1]; /* Buffer to store the LFN */
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#endif
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STATIC bool sd_in_root(void) {
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#if MICROPY_HW_HAS_SDCARD
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// TODO this is not the correct logic to check for /sd
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return sdcard_is_present();
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#else
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return false;
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#endif
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}
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/// \function chdir(path)
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/// Change current directory.
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STATIC mp_obj_t os_chdir(mp_obj_t path_in) {
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const char *path;
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path = mp_obj_str_get_str(path_in);
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FRESULT res = f_chdrive(path);
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if (res == FR_OK) {
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res = f_chdir(path);
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}
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if (res != FR_OK) {
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// TODO should be mp_type_FileNotFoundError
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError, "No such file or directory: '%s'", path));
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}
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(os_chdir_obj, os_chdir);
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/// \function getcwd()
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/// Get the current directory.
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STATIC mp_obj_t os_getcwd(void) {
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char buf[MICROPY_ALLOC_PATH_MAX + 1];
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FRESULT res = f_getcwd(buf, sizeof buf);
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if (res != FR_OK) {
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError, MP_OBJ_NEW_SMALL_INT(fresult_to_errno_table[res])));
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}
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return mp_obj_new_str(buf, strlen(buf), false);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_0(os_getcwd_obj, os_getcwd);
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/// \function listdir([dir])
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/// With no argument, list the current directory. Otherwise list the given directory.
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STATIC mp_obj_t os_listdir(mp_uint_t n_args, const mp_obj_t *args) {
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bool is_str_type = true;
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const char *path;
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if (n_args == 1) {
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if (mp_obj_get_type(args[0]) == &mp_type_bytes) {
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is_str_type = false;
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}
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path = mp_obj_str_get_str(args[0]);
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} else {
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path = "";
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}
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// "hack" to list root directory
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if (path[0] == '/' && path[1] == '\0') {
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mp_obj_t dir_list = mp_obj_new_list(0, NULL);
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mp_obj_list_append(dir_list, MP_OBJ_NEW_QSTR(MP_QSTR_flash));
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if (sd_in_root()) {
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mp_obj_list_append(dir_list, MP_OBJ_NEW_QSTR(MP_QSTR_sd));
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}
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return dir_list;
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}
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FRESULT res;
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FILINFO fno;
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DIR dir;
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#if _USE_LFN
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fno.lfname = lfn;
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fno.lfsize = sizeof lfn;
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#endif
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res = f_opendir(&dir, path); /* Open the directory */
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if (res != FR_OK) {
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// TODO should be mp_type_FileNotFoundError
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError, "No such file or directory: '%s'", path));
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}
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mp_obj_t dir_list = mp_obj_new_list(0, NULL);
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for (;;) {
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res = f_readdir(&dir, &fno); /* Read a directory item */
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if (res != FR_OK || fno.fname[0] == 0) break; /* Break on error or end of dir */
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if (fno.fname[0] == '.' && fno.fname[1] == 0) continue; /* Ignore . entry */
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if (fno.fname[0] == '.' && fno.fname[1] == '.' && fno.fname[2] == 0) continue; /* Ignore .. entry */
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#if _USE_LFN
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char *fn = *fno.lfname ? fno.lfname : fno.fname;
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#else
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char *fn = fno.fname;
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#endif
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/*
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if (fno.fattrib & AM_DIR) {
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// dir
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} else {
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// file
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}
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*/
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// make a string object for this entry
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mp_obj_t entry_o;
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if (is_str_type) {
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entry_o = mp_obj_new_str(fn, strlen(fn), false);
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} else {
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entry_o = mp_obj_new_bytes((const byte*)fn, strlen(fn));
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}
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// add the entry to the list
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mp_obj_list_append(dir_list, entry_o);
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}
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f_closedir(&dir);
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return dir_list;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(os_listdir_obj, 0, 1, os_listdir);
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/// \function mkdir(path)
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/// Create a new directory.
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STATIC mp_obj_t os_mkdir(mp_obj_t path_o) {
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const char *path = mp_obj_str_get_str(path_o);
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FRESULT res = f_mkdir(path);
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switch (res) {
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case FR_OK:
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return mp_const_none;
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case FR_EXIST:
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// TODO should be FileExistsError
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError, "File exists: '%s'", path));
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default:
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError, "Error creating directory '%s'", path));
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}
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(os_mkdir_obj, os_mkdir);
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/// \function remove(path)
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/// Remove a file.
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STATIC mp_obj_t os_remove(mp_obj_t path_o) {
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const char *path = mp_obj_str_get_str(path_o);
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// TODO check that path is actually a file before trying to unlink it
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FRESULT res = f_unlink(path);
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switch (res) {
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case FR_OK:
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return mp_const_none;
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default:
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError, "Error removing file '%s'", path));
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}
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(os_remove_obj, os_remove);
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/// \function rmdir(path)
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/// Remove a directory.
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STATIC mp_obj_t os_rmdir(mp_obj_t path_o) {
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const char *path = mp_obj_str_get_str(path_o);
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// TODO check that path is actually a directory before trying to unlink it
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FRESULT res = f_unlink(path);
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switch (res) {
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case FR_OK:
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return mp_const_none;
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default:
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError, "Error removing directory '%s'", path));
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}
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(os_rmdir_obj, os_rmdir);
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// Checks for path equality, ignoring trailing slashes:
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// path_equal(/, /) -> true
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// path_equal(/flash//, /flash) -> true
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// second argument must be in canonical form (meaning no trailing slash, unless it's just /)
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STATIC bool path_equal(const char *path, const char *path_canonical) {
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for (; *path_canonical != '\0' && *path == *path_canonical; ++path, ++path_canonical) {
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}
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if (*path_canonical != '\0') {
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return false;
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}
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for (; *path == '/'; ++path) {
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}
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return *path == '\0';
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}
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/// \function stat(path)
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/// Get the status of a file or directory.
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STATIC mp_obj_t os_stat(mp_obj_t path_in) {
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const char *path = mp_obj_str_get_str(path_in);
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FILINFO fno;
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#if _USE_LFN
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fno.lfname = NULL;
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fno.lfsize = 0;
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#endif
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FRESULT res;
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if (path_equal(path, "/") || path_equal(path, "/flash") || path_equal(path, "/sd")) {
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// stat built-in directory
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if (path[1] == 's' && !sd_in_root()) {
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// no /sd directory
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res = FR_NO_PATH;
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goto error;
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}
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fno.fsize = 0;
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fno.fdate = 0;
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fno.ftime = 0;
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fno.fattrib = AM_DIR;
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} else {
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res = f_stat(path, &fno);
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if (res != FR_OK) {
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goto error;
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}
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}
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mp_obj_tuple_t *t = mp_obj_new_tuple(10, NULL);
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mp_int_t mode = 0;
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if (fno.fattrib & AM_DIR) {
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mode |= 0x4000; // stat.S_IFDIR
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} else {
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mode |= 0x8000; // stat.S_IFREG
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}
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mp_int_t seconds = mod_time_seconds_since_2000(
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1980 + ((fno.fdate >> 9) & 0x7f),
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(fno.fdate >> 5) & 0x0f,
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fno.fdate & 0x1f,
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(fno.ftime >> 11) & 0x1f,
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(fno.ftime >> 5) & 0x3f,
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2 * (fno.ftime & 0x1f)
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);
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t->items[0] = MP_OBJ_NEW_SMALL_INT(mode); // st_mode
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t->items[1] = MP_OBJ_NEW_SMALL_INT(0); // st_ino
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t->items[2] = MP_OBJ_NEW_SMALL_INT(0); // st_dev
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t->items[3] = MP_OBJ_NEW_SMALL_INT(0); // st_nlink
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t->items[4] = MP_OBJ_NEW_SMALL_INT(0); // st_uid
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t->items[5] = MP_OBJ_NEW_SMALL_INT(0); // st_gid
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t->items[6] = MP_OBJ_NEW_SMALL_INT(fno.fsize); // st_size
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t->items[7] = MP_OBJ_NEW_SMALL_INT(seconds); // st_atime
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t->items[8] = MP_OBJ_NEW_SMALL_INT(seconds); // st_mtime
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t->items[9] = MP_OBJ_NEW_SMALL_INT(seconds); // st_ctime
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return t;
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error:
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nlr_raise(mp_obj_new_exception_arg1(&mp_type_OSError, MP_OBJ_NEW_SMALL_INT(fresult_to_errno_table[res])));
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(os_stat_obj, os_stat);
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/// \function sync()
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/// Sync all filesystems.
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STATIC mp_obj_t os_sync(void) {
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storage_flush();
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_0(os_sync_obj, os_sync);
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#if MICROPY_HW_ENABLE_RNG
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/// \function urandom(n)
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/// Return a bytes object with n random bytes, generated by the hardware
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/// random number generator.
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STATIC mp_obj_t os_urandom(mp_obj_t num) {
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mp_int_t n = mp_obj_get_int(num);
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byte *data;
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mp_obj_t o = mp_obj_str_builder_start(&mp_type_bytes, n, &data);
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for (int i = 0; i < n; i++) {
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data[i] = rng_get();
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}
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return mp_obj_str_builder_end(o);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(os_urandom_obj, os_urandom);
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#endif
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STATIC const mp_map_elem_t os_module_globals_table[] = {
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{ MP_OBJ_NEW_QSTR(MP_QSTR___name__), MP_OBJ_NEW_QSTR(MP_QSTR_os) },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_chdir), (mp_obj_t)&os_chdir_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_getcwd), (mp_obj_t)&os_getcwd_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_listdir), (mp_obj_t)&os_listdir_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_mkdir), (mp_obj_t)&os_mkdir_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_remove), (mp_obj_t)&os_remove_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_rmdir), (mp_obj_t)&os_rmdir_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_stat), (mp_obj_t)&os_stat_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_unlink), (mp_obj_t)&os_remove_obj }, // unlink aliases to remove
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{ MP_OBJ_NEW_QSTR(MP_QSTR_sync), (mp_obj_t)&os_sync_obj },
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/// \constant sep - separation character used in paths
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{ MP_OBJ_NEW_QSTR(MP_QSTR_sep), MP_OBJ_NEW_QSTR(MP_QSTR__slash_) },
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#if MICROPY_HW_ENABLE_RNG
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{ MP_OBJ_NEW_QSTR(MP_QSTR_urandom), (mp_obj_t)&os_urandom_obj },
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#endif
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};
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STATIC const mp_obj_dict_t os_module_globals = {
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.base = {&mp_type_dict},
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.map = {
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.all_keys_are_qstrs = 1,
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.table_is_fixed_array = 1,
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.used = MP_ARRAY_SIZE(os_module_globals_table),
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.alloc = MP_ARRAY_SIZE(os_module_globals_table),
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.table = (mp_map_elem_t*)os_module_globals_table,
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},
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};
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const mp_obj_module_t os_module = {
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.base = { &mp_type_module },
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.name = MP_QSTR_os,
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.globals = (mp_obj_dict_t*)&os_module_globals,
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};
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