circuitpython/unix/file.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
*
* 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 "mpconfig.h"
#include "nlr.h"
#include "misc.h"
#include "qstr.h"
#include "obj.h"
#include "runtime.h"
#include "stream.h"
typedef struct _mp_obj_fdfile_t {
mp_obj_base_t base;
int fd;
} mp_obj_fdfile_t;
#ifdef MICROPY_CPYTHON_COMPAT
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(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {
mp_obj_fdfile_t *self = self_in;
print(env, "<io.%s %d>", mp_obj_get_type_str(self), self->fd);
}
STATIC machine_int_t fdfile_read(mp_obj_t o_in, void *buf, machine_uint_t size, int *errcode) {
mp_obj_fdfile_t *o = o_in;
check_fd_is_open(o);
machine_int_t r = read(o->fd, buf, size);
if (r == -1) {
*errcode = errno;
}
return r;
}
STATIC machine_int_t fdfile_write(mp_obj_t o_in, const void *buf, machine_uint_t size, int *errcode) {
mp_obj_fdfile_t *o = o_in;
check_fd_is_open(o);
machine_int_t r = write(o->fd, buf, size);
if (r == -1) {
*errcode = errno;
}
return r;
}
STATIC mp_obj_t fdfile_close(mp_obj_t self_in) {
mp_obj_fdfile_t *self = 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);
mp_obj_t fdfile___exit__(uint n_args, const mp_obj_t *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 = self_in;
check_fd_is_open(self);
return MP_OBJ_NEW_SMALL_INT((machine_int_t)self->fd);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(fdfile_fileno_obj, fdfile_fileno);
STATIC mp_obj_t fdfile_make_new(mp_obj_t type_in, uint n_args, uint n_kw, const mp_obj_t *args) {
mp_obj_fdfile_t *o = m_new_obj(mp_obj_fdfile_t);
mp_const_obj_t type = type_in;
const char *mode_s;
if (n_args > 1) {
mode_s = mp_obj_str_get_str(args[1]);
} else {
mode_s = "r";
}
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_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;
if (MP_OBJ_IS_SMALL_INT(args[0])) {
o->fd = MP_OBJ_SMALL_INT_VALUE(args[0]);
return o;
}
const char *fname = mp_obj_str_get_str(args[0]);
int fd = open(fname, mode, 0644);
if (fd == -1) {
nlr_raise(mp_obj_new_exception_arg1(&mp_type_OSError, MP_OBJ_NEW_SMALL_INT((machine_int_t)errno)));
}
o->fd = fd;
return o;
}
STATIC const mp_map_elem_t rawfile_locals_dict_table[] = {
{ MP_OBJ_NEW_QSTR(MP_QSTR_fileno), (mp_obj_t)&fdfile_fileno_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_read), (mp_obj_t)&mp_stream_read_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_readall), (mp_obj_t)&mp_stream_readall_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_readline), (mp_obj_t)&mp_stream_unbuffered_readline_obj},
{ MP_OBJ_NEW_QSTR(MP_QSTR_readlines), (mp_obj_t)&mp_stream_unbuffered_readlines_obj},
{ MP_OBJ_NEW_QSTR(MP_QSTR_write), (mp_obj_t)&mp_stream_write_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_close), (mp_obj_t)&fdfile_close_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR___enter__), (mp_obj_t)&mp_identity_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR___exit__), (mp_obj_t)&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,
.is_bytes = true,
};
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_t)&rawfile_locals_dict,
};
#endif
STATIC const mp_stream_p_t textio_stream_p = {
.read = fdfile_read,
.write = fdfile_write,
};
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_t)&rawfile_locals_dict,
};
// Factory function for I/O stream classes
mp_obj_t mp_builtin_open(uint n_args, const mp_obj_t *args) {
// TODO: analyze mode and buffering args and instantiate appropriate type
return fdfile_make_new((mp_obj_t)&mp_type_textio, n_args, 0, args);
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_builtin_open_obj, 1, 2, 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 };