unix/file.c - lite/micropython - Linaro Git Browser

 /*
  * This file is part of the Micro Python project, http://micropython.org/
  *
  * The MIT License (MIT)
  *
  * Copyright (c) 2013, 2014 Damien P. George
  *
  * 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 <stdio.h>
 #include <unistd.h>
 #include <fcntl.h>
 #include <errno.h>
 #include <sys/stat.h>
 #include <sys/types.h>

 #include "py/nlr.h"
 #include "py/runtime.h"
 #include "py/stream.h"
 #include "py/builtin.h"
 #include "py/mphal.h"

 #if MICROPY_PY_IO

 #ifdef _WIN32
 #define fsync _commit
 #endif

 typedef struct _mp_obj_fdfile_t {
     mp_obj_base_t base;
     int fd;
 } mp_obj_fdfile_t;

 #ifdef MICROPY_CPYTHON_COMPAT
 STATIC void check_fd_is_open(const mp_obj_fdfile_t *o) {
     if (o->fd < 0) {
         nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "I/O operation on closed file"));
     }
 }
 #else
 #define check_fd_is_open(o)
 #endif

 extern const mp_obj_type_t mp_type_fileio;
 extern const mp_obj_type_t mp_type_textio;

 STATIC void fdfile_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
     (void)kind;
     mp_obj_fdfile_t *self = MP_OBJ_TO_PTR(self_in);
     mp_printf(print, "<io.%s %d>", mp_obj_get_type_str(self_in), self->fd);
 }

 STATIC mp_uint_t fdfile_read(mp_obj_t o_in, void *buf, mp_uint_t size, int *errcode) {
     mp_obj_fdfile_t *o = MP_OBJ_TO_PTR(o_in);
     check_fd_is_open(o);
     mp_int_t r = read(o->fd, buf, size);
     if (r == -1) {
         *errcode = errno;
         return MP_STREAM_ERROR;
     }
     return r;
 }

 STATIC mp_uint_t fdfile_write(mp_obj_t o_in, const void *buf, mp_uint_t size, int *errcode) {
     mp_obj_fdfile_t *o = MP_OBJ_TO_PTR(o_in);
     check_fd_is_open(o);
     #if MICROPY_PY_OS_DUPTERM
     if (o->fd <= STDERR_FILENO) {
         mp_hal_stdout_tx_strn(buf, size);
         return size;
     }
     #endif
     mp_int_t r = write(o->fd, buf, size);
     if (r == -1) {
         *errcode = errno;
         return MP_STREAM_ERROR;
     }
     return r;
 }

 STATIC mp_uint_t fdfile_ioctl(mp_obj_t o_in, mp_uint_t request, uintptr_t arg, int *errcode) {
     mp_obj_fdfile_t *o = MP_OBJ_TO_PTR(o_in);
     if (request == MP_STREAM_SEEK) {
         struct mp_stream_seek_t *s = (struct mp_stream_seek_t*)arg;
         off_t off = lseek(o->fd, s->offset, s->whence);
         if (off == (off_t)-1) {
             *errcode = errno;
             return MP_STREAM_ERROR;
         }
         s->offset = off;
         return 0;
     } else {
         *errcode = EINVAL;
         return MP_STREAM_ERROR;
     }
 }

 STATIC mp_obj_t fdfile_flush(mp_obj_t self_in) {
     mp_obj_fdfile_t *self = MP_OBJ_TO_PTR(self_in);
     check_fd_is_open(self);
     fsync(self->fd);
     return mp_const_none;
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_1(fdfile_flush_obj, fdfile_flush);

 STATIC mp_obj_t fdfile_close(mp_obj_t self_in) {
     mp_obj_fdfile_t *self = MP_OBJ_TO_PTR(self_in);
     close(self->fd);
 #ifdef MICROPY_CPYTHON_COMPAT
     self->fd = -1;
 #endif
     return mp_const_none;
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_1(fdfile_close_obj, fdfile_close);

 STATIC mp_obj_t fdfile___exit__(size_t n_args, const mp_obj_t *args) {
     (void)n_args;
     return fdfile_close(args[0]);
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(fdfile___exit___obj, 4, 4, fdfile___exit__);

 STATIC mp_obj_t fdfile_fileno(mp_obj_t self_in) {
     mp_obj_fdfile_t *self = MP_OBJ_TO_PTR(self_in);
     check_fd_is_open(self);
     return MP_OBJ_NEW_SMALL_INT(self->fd);
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_1(fdfile_fileno_obj, fdfile_fileno);

 // Note: encoding is ignored for now; it's also not a valid kwarg for CPython's FileIO,
 // but by adding it here we can use one single mp_arg_t array for open() and FileIO's constructor
 STATIC const mp_arg_t file_open_args[] = {
     { MP_QSTR_file, MP_ARG_OBJ | MP_ARG_REQUIRED, {.u_rom_obj = MP_ROM_PTR(&mp_const_none_obj)} },
     { MP_QSTR_mode, MP_ARG_OBJ, {.u_obj = MP_OBJ_NEW_QSTR(MP_QSTR_r)} },
     { MP_QSTR_encoding, MP_ARG_OBJ | MP_ARG_KW_ONLY, {.u_rom_obj = MP_ROM_PTR(&mp_const_none_obj)} },
 };
 #define FILE_OPEN_NUM_ARGS MP_ARRAY_SIZE(file_open_args)

 STATIC mp_obj_t fdfile_open(const mp_obj_type_t *type, mp_arg_val_t *args) {
     mp_obj_fdfile_t *o = m_new_obj(mp_obj_fdfile_t);
     const char *mode_s = mp_obj_str_get_str(args[1].u_obj);

     int mode = 0;
     while (*mode_s) {
         switch (*mode_s++) {
             // Note: these assume O_RDWR = O_RDONLY | O_WRONLY
             case 'r':
                 mode |= O_RDONLY;
                 break;
             case 'w':
                 mode |= O_WRONLY | O_CREAT | O_TRUNC;
                 break;
             case 'a':
                 mode |= O_WRONLY | O_CREAT | O_APPEND;
                 break;
             case '+':
                 mode |= O_RDWR;
                 break;
             #if MICROPY_PY_IO_FILEIO
             // If we don't have io.FileIO, then files are in text mode implicitly
             case 'b':
                 type = &mp_type_fileio;
                 break;
             case 't':
                 type = &mp_type_textio;
                 break;
             #endif
         }
     }

     o->base.type = type;

     mp_obj_t fid = args[0].u_obj;

     if (MP_OBJ_IS_SMALL_INT(fid)) {
         o->fd = MP_OBJ_SMALL_INT_VALUE(fid);
         return MP_OBJ_FROM_PTR(o);
     }

     const char *fname = mp_obj_str_get_str(fid);
     int fd = open(fname, mode, 0644);
     if (fd == -1) {
         nlr_raise(mp_obj_new_exception_arg1(&mp_type_OSError, MP_OBJ_NEW_SMALL_INT(errno)));
     }
     o->fd = fd;
     return MP_OBJ_FROM_PTR(o);
 }

 STATIC mp_obj_t fdfile_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
     mp_arg_val_t arg_vals[FILE_OPEN_NUM_ARGS];
     mp_arg_parse_all_kw_array(n_args, n_kw, args, FILE_OPEN_NUM_ARGS, file_open_args, arg_vals);
     return fdfile_open(type, arg_vals);
 }

 STATIC const mp_rom_map_elem_t rawfile_locals_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_fileno), MP_ROM_PTR(&fdfile_fileno_obj) },
     { MP_ROM_QSTR(MP_QSTR_read), MP_ROM_PTR(&mp_stream_read_obj) },
     { MP_ROM_QSTR(MP_QSTR_readall), MP_ROM_PTR(&mp_stream_readall_obj) },
     { MP_ROM_QSTR(MP_QSTR_readinto), MP_ROM_PTR(&mp_stream_readinto_obj) },
     { MP_ROM_QSTR(MP_QSTR_readline), MP_ROM_PTR(&mp_stream_unbuffered_readline_obj) },
     { MP_ROM_QSTR(MP_QSTR_readlines), MP_ROM_PTR(&mp_stream_unbuffered_readlines_obj) },
     { MP_ROM_QSTR(MP_QSTR_write), MP_ROM_PTR(&mp_stream_write_obj) },
     { MP_ROM_QSTR(MP_QSTR_seek), MP_ROM_PTR(&mp_stream_seek_obj) },
     { MP_ROM_QSTR(MP_QSTR_tell), MP_ROM_PTR(&mp_stream_tell_obj) },
     { MP_ROM_QSTR(MP_QSTR_flush), MP_ROM_PTR(&fdfile_flush_obj) },
     { MP_ROM_QSTR(MP_QSTR_close), MP_ROM_PTR(&fdfile_close_obj) },
     { MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&mp_identity_obj) },
     { MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&fdfile___exit___obj) },
 };

 STATIC MP_DEFINE_CONST_DICT(rawfile_locals_dict, rawfile_locals_dict_table);

 #if MICROPY_PY_IO_FILEIO
 STATIC const mp_stream_p_t fileio_stream_p = {
     .read = fdfile_read,
     .write = fdfile_write,
     .ioctl = fdfile_ioctl,
 };

 const mp_obj_type_t mp_type_fileio = {
     { &mp_type_type },
     .name = MP_QSTR_FileIO,
     .print = fdfile_print,
     .make_new = fdfile_make_new,
     .getiter = mp_identity,
     .iternext = mp_stream_unbuffered_iter,
     .stream_p = &fileio_stream_p,
     .locals_dict = (mp_obj_dict_t*)&rawfile_locals_dict,
 };
 #endif

 STATIC const mp_stream_p_t textio_stream_p = {
     .read = fdfile_read,
     .write = fdfile_write,
     .ioctl = fdfile_ioctl,
     .is_text = true,
 };

 const mp_obj_type_t mp_type_textio = {
     { &mp_type_type },
     .name = MP_QSTR_TextIOWrapper,
     .print = fdfile_print,
     .make_new = fdfile_make_new,
     .getiter = mp_identity,
     .iternext = mp_stream_unbuffered_iter,
     .stream_p = &textio_stream_p,
     .locals_dict = (mp_obj_dict_t*)&rawfile_locals_dict,
 };

 // Factory function for I/O stream classes
 mp_obj_t mp_builtin_open(size_t n_args, const mp_obj_t *args, mp_map_t *kwargs) {
     // TODO: analyze buffering args and instantiate appropriate type
     mp_arg_val_t arg_vals[FILE_OPEN_NUM_ARGS];
     mp_arg_parse_all(n_args, args, kwargs, FILE_OPEN_NUM_ARGS, file_open_args, arg_vals);
     return fdfile_open(&mp_type_textio, arg_vals);
 }
 MP_DEFINE_CONST_FUN_OBJ_KW(mp_builtin_open_obj, 1, mp_builtin_open);

 const mp_obj_fdfile_t mp_sys_stdin_obj  = { .base = {&mp_type_textio}, .fd = STDIN_FILENO };
 const mp_obj_fdfile_t mp_sys_stdout_obj = { .base = {&mp_type_textio}, .fd = STDOUT_FILENO };
 const mp_obj_fdfile_t mp_sys_stderr_obj = { .base = {&mp_type_textio}, .fd = STDERR_FILENO };

 #endif // MICROPY_PY_IO
	/*
	* This file is part of the Micro Python project, http://micropython.org/
	*
	* The MIT License (MIT)
	*
	* Copyright (c) 2013, 2014 Damien P. George
	*
	* 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 <stdio.h>
	#include <unistd.h>
	#include <fcntl.h>
	#include <errno.h>
	#include <sys/stat.h>
	#include <sys/types.h>

	#include "py/nlr.h"
	#include "py/runtime.h"
	#include "py/stream.h"
	#include "py/builtin.h"
	#include "py/mphal.h"

	#if MICROPY_PY_IO

	#ifdef _WIN32
	#define fsync _commit
	#endif

	typedef struct _mp_obj_fdfile_t {
	mp_obj_base_t base;
	int fd;
	} mp_obj_fdfile_t;

	#ifdef MICROPY_CPYTHON_COMPAT
	STATIC void check_fd_is_open(const mp_obj_fdfile_t *o) {
	if (o->fd < 0) {
	nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "I/O operation on closed file"));
	}
	}
	#else
	#define check_fd_is_open(o)
	#endif

	extern const mp_obj_type_t mp_type_fileio;
	extern const mp_obj_type_t mp_type_textio;

	STATIC void fdfile_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
	(void)kind;
	mp_obj_fdfile_t *self = MP_OBJ_TO_PTR(self_in);
	mp_printf(print, "<io.%s %d>", mp_obj_get_type_str(self_in), self->fd);
	}

	STATIC mp_uint_t fdfile_read(mp_obj_t o_in, void buf, mp_uint_t size, int errcode) {
	mp_obj_fdfile_t *o = MP_OBJ_TO_PTR(o_in);
	check_fd_is_open(o);
	mp_int_t r = read(o->fd, buf, size);
	if (r == -1) {
	*errcode = errno;
	return MP_STREAM_ERROR;
	}
	return r;
	}

	STATIC mp_uint_t fdfile_write(mp_obj_t o_in, const void buf, mp_uint_t size, int errcode) {
	mp_obj_fdfile_t *o = MP_OBJ_TO_PTR(o_in);
	check_fd_is_open(o);
	#if MICROPY_PY_OS_DUPTERM
	if (o->fd <= STDERR_FILENO) {
	mp_hal_stdout_tx_strn(buf, size);
	return size;
	}
	#endif
	mp_int_t r = write(o->fd, buf, size);
	if (r == -1) {
	*errcode = errno;
	return MP_STREAM_ERROR;
	}
	return r;
	}

	STATIC mp_uint_t fdfile_ioctl(mp_obj_t o_in, mp_uint_t request, uintptr_t arg, int *errcode) {
	mp_obj_fdfile_t *o = MP_OBJ_TO_PTR(o_in);
	if (request == MP_STREAM_SEEK) {
	struct mp_stream_seek_t s = (struct mp_stream_seek_t)arg;
	off_t off = lseek(o->fd, s->offset, s->whence);
	if (off == (off_t)-1) {
	*errcode = errno;
	return MP_STREAM_ERROR;
	}
	s->offset = off;
	return 0;
	} else {
	*errcode = EINVAL;
	return MP_STREAM_ERROR;
	}
	}

	STATIC mp_obj_t fdfile_flush(mp_obj_t self_in) {
	mp_obj_fdfile_t *self = MP_OBJ_TO_PTR(self_in);
	check_fd_is_open(self);
	fsync(self->fd);
	return mp_const_none;
	}
	STATIC MP_DEFINE_CONST_FUN_OBJ_1(fdfile_flush_obj, fdfile_flush);

	STATIC mp_obj_t fdfile_close(mp_obj_t self_in) {
	mp_obj_fdfile_t *self = MP_OBJ_TO_PTR(self_in);
	close(self->fd);
	#ifdef MICROPY_CPYTHON_COMPAT
	self->fd = -1;
	#endif
	return mp_const_none;
	}
	STATIC MP_DEFINE_CONST_FUN_OBJ_1(fdfile_close_obj, fdfile_close);

	STATIC mp_obj_t fdfile___exit__(size_t n_args, const mp_obj_t *args) {
	(void)n_args;
	return fdfile_close(args[0]);
	}
	STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(fdfile___exit___obj, 4, 4, fdfile___exit__);

	STATIC mp_obj_t fdfile_fileno(mp_obj_t self_in) {
	mp_obj_fdfile_t *self = MP_OBJ_TO_PTR(self_in);
	check_fd_is_open(self);
	return MP_OBJ_NEW_SMALL_INT(self->fd);
	}
	STATIC MP_DEFINE_CONST_FUN_OBJ_1(fdfile_fileno_obj, fdfile_fileno);

	// Note: encoding is ignored for now; it's also not a valid kwarg for CPython's FileIO,
	// but by adding it here we can use one single mp_arg_t array for open() and FileIO's constructor
	STATIC const mp_arg_t file_open_args[] = {
	{ MP_QSTR_file, MP_ARG_OBJ \| MP_ARG_REQUIRED, {.u_rom_obj = MP_ROM_PTR(&mp_const_none_obj)} },
	{ MP_QSTR_mode, MP_ARG_OBJ, {.u_obj = MP_OBJ_NEW_QSTR(MP_QSTR_r)} },
	{ MP_QSTR_encoding, MP_ARG_OBJ \| MP_ARG_KW_ONLY, {.u_rom_obj = MP_ROM_PTR(&mp_const_none_obj)} },
	};
	#define FILE_OPEN_NUM_ARGS MP_ARRAY_SIZE(file_open_args)

	STATIC mp_obj_t fdfile_open(const mp_obj_type_t type, mp_arg_val_t args) {
	mp_obj_fdfile_t *o = m_new_obj(mp_obj_fdfile_t);
	const char *mode_s = mp_obj_str_get_str(args[1].u_obj);

	int mode = 0;
	while (*mode_s) {
	switch (*mode_s++) {
	// Note: these assume O_RDWR = O_RDONLY \| O_WRONLY
	case 'r':
	mode \|= O_RDONLY;
	break;
	case 'w':
	mode \|= O_WRONLY \| O_CREAT \| O_TRUNC;
	break;
	case 'a':
	mode \|= O_WRONLY \| O_CREAT \| O_APPEND;
	break;
	case '+':
	mode \|= O_RDWR;
	break;
	#if MICROPY_PY_IO_FILEIO
	// If we don't have io.FileIO, then files are in text mode implicitly
	case 'b':
	type = &mp_type_fileio;
	break;
	case 't':
	type = &mp_type_textio;
	break;
	#endif
	}
	}

	o->base.type = type;

	mp_obj_t fid = args[0].u_obj;

	if (MP_OBJ_IS_SMALL_INT(fid)) {
	o->fd = MP_OBJ_SMALL_INT_VALUE(fid);
	return MP_OBJ_FROM_PTR(o);
	}

	const char *fname = mp_obj_str_get_str(fid);
	int fd = open(fname, mode, 0644);
	if (fd == -1) {
	nlr_raise(mp_obj_new_exception_arg1(&mp_type_OSError, MP_OBJ_NEW_SMALL_INT(errno)));
	}
	o->fd = fd;
	return MP_OBJ_FROM_PTR(o);
	}

	STATIC mp_obj_t fdfile_make_new(const mp_obj_type_t type, size_t n_args, size_t n_kw, const mp_obj_t args) {
	mp_arg_val_t arg_vals[FILE_OPEN_NUM_ARGS];
	mp_arg_parse_all_kw_array(n_args, n_kw, args, FILE_OPEN_NUM_ARGS, file_open_args, arg_vals);
	return fdfile_open(type, arg_vals);
	}

	STATIC const mp_rom_map_elem_t rawfile_locals_dict_table[] = {
	{ MP_ROM_QSTR(MP_QSTR_fileno), MP_ROM_PTR(&fdfile_fileno_obj) },
	{ MP_ROM_QSTR(MP_QSTR_read), MP_ROM_PTR(&mp_stream_read_obj) },
	{ MP_ROM_QSTR(MP_QSTR_readall), MP_ROM_PTR(&mp_stream_readall_obj) },
	{ MP_ROM_QSTR(MP_QSTR_readinto), MP_ROM_PTR(&mp_stream_readinto_obj) },
	{ MP_ROM_QSTR(MP_QSTR_readline), MP_ROM_PTR(&mp_stream_unbuffered_readline_obj) },
	{ MP_ROM_QSTR(MP_QSTR_readlines), MP_ROM_PTR(&mp_stream_unbuffered_readlines_obj) },
	{ MP_ROM_QSTR(MP_QSTR_write), MP_ROM_PTR(&mp_stream_write_obj) },
	{ MP_ROM_QSTR(MP_QSTR_seek), MP_ROM_PTR(&mp_stream_seek_obj) },
	{ MP_ROM_QSTR(MP_QSTR_tell), MP_ROM_PTR(&mp_stream_tell_obj) },
	{ MP_ROM_QSTR(MP_QSTR_flush), MP_ROM_PTR(&fdfile_flush_obj) },
	{ MP_ROM_QSTR(MP_QSTR_close), MP_ROM_PTR(&fdfile_close_obj) },
	{ MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&mp_identity_obj) },
	{ MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&fdfile___exit___obj) },
	};

	STATIC MP_DEFINE_CONST_DICT(rawfile_locals_dict, rawfile_locals_dict_table);

	#if MICROPY_PY_IO_FILEIO
	STATIC const mp_stream_p_t fileio_stream_p = {
	.read = fdfile_read,
	.write = fdfile_write,
	.ioctl = fdfile_ioctl,
	};

	const mp_obj_type_t mp_type_fileio = {
	{ &mp_type_type },
	.name = MP_QSTR_FileIO,
	.print = fdfile_print,
	.make_new = fdfile_make_new,
	.getiter = mp_identity,
	.iternext = mp_stream_unbuffered_iter,
	.stream_p = &fileio_stream_p,
	.locals_dict = (mp_obj_dict_t*)&rawfile_locals_dict,
	};
	#endif

	STATIC const mp_stream_p_t textio_stream_p = {
	.read = fdfile_read,
	.write = fdfile_write,
	.ioctl = fdfile_ioctl,
	.is_text = true,
	};

	const mp_obj_type_t mp_type_textio = {
	{ &mp_type_type },
	.name = MP_QSTR_TextIOWrapper,
	.print = fdfile_print,
	.make_new = fdfile_make_new,
	.getiter = mp_identity,
	.iternext = mp_stream_unbuffered_iter,
	.stream_p = &textio_stream_p,
	.locals_dict = (mp_obj_dict_t*)&rawfile_locals_dict,
	};

	// Factory function for I/O stream classes
	mp_obj_t mp_builtin_open(size_t n_args, const mp_obj_t args, mp_map_t kwargs) {
	// TODO: analyze buffering args and instantiate appropriate type
	mp_arg_val_t arg_vals[FILE_OPEN_NUM_ARGS];
	mp_arg_parse_all(n_args, args, kwargs, FILE_OPEN_NUM_ARGS, file_open_args, arg_vals);
	return fdfile_open(&mp_type_textio, arg_vals);
	}
	MP_DEFINE_CONST_FUN_OBJ_KW(mp_builtin_open_obj, 1, mp_builtin_open);

	const mp_obj_fdfile_t mp_sys_stdin_obj = { .base = {&mp_type_textio}, .fd = STDIN_FILENO };
	const mp_obj_fdfile_t mp_sys_stdout_obj = { .base = {&mp_type_textio}, .fd = STDOUT_FILENO };
	const mp_obj_fdfile_t mp_sys_stderr_obj = { .base = {&mp_type_textio}, .fd = STDERR_FILENO };

	#endif // MICROPY_PY_IO