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stmhal, file: Implement a,x,+ open modes, seek and tell. 

Also now returns correct POSIX errno when an IO operation fails.

Addresses issues #516 and #676.
This commit is contained in:
Damien George 2014-06-11 15:41:14 +01:00
parent 58cbb4d661
commit b7572ad11b
3 changed files with 176 additions and 47 deletions
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217
stmhal/file.c
View File

@ -25,9 +25,11 @@
*/
#include <stdio.h>
#include <errno.h>
#include "misc.h"
#include "mpconfig.h"
#include "nlr.h"
#include "misc.h"
#include "qstr.h"
#include "obj.h"
#include "runtime.h"
@ -35,6 +37,33 @@
#include "file.h"
#include "ff.h"
extern const mp_obj_type_t mp_type_fileio;
extern const mp_obj_type_t mp_type_textio;
// this table converts from FRESULT to POSIX errno
STATIC const byte fresult_to_errno_table[] = {
[FR_OK] = 0,
[FR_DISK_ERR] = EIO,
[FR_INT_ERR] = EIO,
[FR_NOT_READY] = EBUSY,
[FR_NO_FILE] = ENOENT,
[FR_NO_PATH] = ENOENT,
[FR_INVALID_NAME] = EINVAL,
[FR_DENIED] = EACCES,
[FR_EXIST] = EEXIST,
[FR_INVALID_OBJECT] = EINVAL,
[FR_WRITE_PROTECTED] = EROFS,
[FR_INVALID_DRIVE] = ENODEV,
[FR_NOT_ENABLED] = ENODEV,
[FR_NO_FILESYSTEM] = ENODEV,
[FR_MKFS_ABORTED] = EIO,
[FR_TIMEOUT] = EIO,
[FR_LOCKED] = EIO,
[FR_NOT_ENOUGH_CORE] = ENOMEM,
[FR_TOO_MANY_OPEN_FILES] = EMFILE,
[FR_INVALID_PARAMETER] = EINVAL,
};
typedef struct _pyb_file_obj_t {
mp_obj_base_t base;
FIL fp;
@ -44,17 +73,25 @@ void file_obj_print(void (*print)(void *env, const char *fmt, ...), void *env, m
printf("<io.%s %p>", mp_obj_get_type_str(self_in), self_in);
}
STATIC machine_int_t file_read(mp_obj_t self_in, void *buf, machine_uint_t size, int *errcode) {
STATIC machine_int_t file_obj_read(mp_obj_t self_in, void *buf, machine_uint_t size, int *errcode) {
pyb_file_obj_t *self = self_in;
UINT sz_out;
*errcode = f_read(&self->fp, buf, size, &sz_out);
FRESULT res = f_read(&self->fp, buf, size, &sz_out);
if (res != FR_OK) {
*errcode = fresult_to_errno_table[res];
return -1;
}
return sz_out;
}
STATIC machine_int_t file_write(mp_obj_t self_in, const void *buf, machine_uint_t size, int *errcode) {
STATIC machine_int_t file_obj_write(mp_obj_t self_in, const void *buf, machine_uint_t size, int *errcode) {
pyb_file_obj_t *self = self_in;
UINT sz_out;
*errcode = f_write(&self->fp, buf, size, &sz_out);
FRESULT res = f_write(&self->fp, buf, size, &sz_out);
if (res != FR_OK) {
*errcode = fresult_to_errno_table[res];
return -1;
}
return sz_out;
}
@ -63,78 +100,164 @@ mp_obj_t file_obj_close(mp_obj_t self_in) {
f_close(&self->fp);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(file_obj_close_obj, file_obj_close);
mp_obj_t file_obj___exit__(uint n_args, const mp_obj_t *args) {
return file_obj_close(args[0]);
}
static MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(file_obj___exit___obj, 4, 4, file_obj___exit__);
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(file_obj___exit___obj, 4, 4, file_obj___exit__);
mp_obj_t file_obj_seek(uint n_args, const mp_obj_t *args) {
pyb_file_obj_t *self = args[0];
machine_int_t offset = mp_obj_get_int(args[1]);
machine_int_t whence = 0;
if (n_args == 3) {
whence = mp_obj_get_int(args[2]);
}
switch (whence) {
case 0: // SEEK_SET
f_lseek(&self->fp, offset);
break;
case 1: // SEEK_CUR
if (offset != 0) {
goto error;
}
// no-operation
break;
case 2: // SEEK_END
if (offset != 0) {
goto error;
}
f_lseek(&self->fp, f_size(&self->fp));
break;
default:
goto error;
}
return mp_obj_new_int_from_uint(f_tell(&self->fp));
error:
// A bad whence is a ValueError, while offset!=0 is an io.UnsupportedOperation.
// But the latter inherits ValueError (as well as IOError), so we just raise ValueError.
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "invalid whence and/or offset"));
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(file_obj_seek_obj, 2, 3, file_obj_seek);
mp_obj_t file_obj_tell(mp_obj_t self_in) {
pyb_file_obj_t *self = self_in;
return mp_obj_new_int_from_uint(f_tell(&self->fp));
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(file_obj_tell_obj, file_obj_tell);
STATIC mp_obj_t file_obj_make_new(mp_obj_t type, uint n_args, uint n_kw, const mp_obj_t *args) {
mp_arg_check_num(n_args, n_kw, 1, 2, false);
const char *fname = mp_obj_str_get_str(args[0]);
int mode = 0;
if (n_args == 1) {
mode = FA_READ;
} else {
const char *mode_s = mp_obj_str_get_str(args[1]);
// TODO make sure only one of r, w, x, a, and b, t are specified
while (*mode_s) {
switch (*mode_s++) {
case 'r':
mode |= FA_READ;
break;
case 'w':
mode |= FA_WRITE | FA_CREATE_ALWAYS;
break;
case 'x':
mode |= FA_WRITE | FA_CREATE_NEW;
break;
case 'a':
mode |= FA_WRITE | FA_OPEN_ALWAYS;
break;
case '+':
mode |= FA_READ | FA_WRITE;
break;
#if MICROPY_PY_IO_FILEIO
case 'b':
type = (mp_obj_t)&mp_type_fileio;
break;
#endif
case 't':
type = (mp_obj_t)&mp_type_textio;
break;
}
}
}
pyb_file_obj_t *o = m_new_obj_with_finaliser(pyb_file_obj_t);
o->base.type = type;
FRESULT res = f_open(&o->fp, fname, mode);
if (res != FR_OK) {
m_del_obj(pyb_file_obj_t, o);
nlr_raise(mp_obj_new_exception_arg1(&mp_type_OSError, MP_OBJ_NEW_SMALL_INT((machine_int_t)fresult_to_errno_table[res])));
}
return o;
}
// TODO gc hook to close the file if not already closed
STATIC const mp_map_elem_t file_locals_dict_table[] = {
STATIC const mp_map_elem_t rawfile_locals_dict_table[] = {
{ 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)&file_obj_close_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_seek), (mp_obj_t)&file_obj_seek_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_tell), (mp_obj_t)&file_obj_tell_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR___del__), (mp_obj_t)&file_obj_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)&file_obj___exit___obj },
};
STATIC MP_DEFINE_CONST_DICT(file_locals_dict, file_locals_dict_table);
STATIC MP_DEFINE_CONST_DICT(rawfile_locals_dict, rawfile_locals_dict_table);
STATIC mp_obj_t file_obj_make_new(mp_obj_t type_in, uint n_args, uint n_kw, const mp_obj_t *args);
#if MICROPY_PY_IO_FILEIO
STATIC const mp_stream_p_t fileio_stream_p = {
.read = file_obj_read,
.write = file_obj_write,
.is_bytes = true,
};
STATIC const mp_stream_p_t file_obj_stream_p = {
.read = file_read,
.write = file_write,
const mp_obj_type_t mp_type_fileio = {
{ &mp_type_type },
.name = MP_QSTR_FileIO,
.print = file_obj_print,
.make_new = file_obj_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 = file_obj_read,
.write = file_obj_write,
};
const mp_obj_type_t mp_type_textio = {
{ &mp_type_type },
.name = MP_QSTR_FileIO,
.make_new = file_obj_make_new,
.name = MP_QSTR_TextIOWrapper,
.print = file_obj_print,
.make_new = file_obj_make_new,
.getiter = mp_identity,
.iternext = mp_stream_unbuffered_iter,
.stream_p = &file_obj_stream_p,
.locals_dict = (mp_obj_t)&file_locals_dict,
.stream_p = &textio_stream_p,
.locals_dict = (mp_obj_t)&rawfile_locals_dict,
};
STATIC mp_obj_t file_obj_make_new(mp_obj_t type_in, uint n_args, uint n_kw, const mp_obj_t *args) {
mp_arg_check_num(n_args, n_kw, 1, 2, false);
const char *filename = mp_obj_str_get_str(args[0]);
const char *mode = "r";
if (n_args > 1) {
mode = mp_obj_str_get_str(args[1]);
}
pyb_file_obj_t *self = m_new_obj_with_finaliser(pyb_file_obj_t);
self->base.type = &mp_type_textio;
if (mode[0] == 'r') {
// open for reading
FRESULT res = f_open(&self->fp, filename, FA_READ);
if (res != FR_OK) {
printf("FileNotFoundError: [Errno 2] No such file or directory: '%s'\n", filename);
return mp_const_none;
}
} else if (mode[0] == 'w') {
// open for writing, truncate the file first
FRESULT res = f_open(&self->fp, filename, FA_WRITE | FA_CREATE_ALWAYS);
if (res != FR_OK) {
printf("?FileError: could not create file: '%s'\n", filename);
return mp_const_none;
}
} else {
printf("ValueError: invalid mode: '%s'\n", mode);
return mp_const_none;
}
return self;
}
// Factory function for I/O stream classes
STATIC mp_obj_t pyb_io_open(uint n_args, const mp_obj_t *args) {
// TODO: analyze mode and buffering args and instantiate appropriate type

2
stmhal/mpconfigport.h
View File

@ -48,6 +48,8 @@
#define MICROPY_PY_SYS_EXIT (1)
#define MICROPY_PY_SYS_STDFILES (1)
#define MICROPY_PY_CMATH (1)
#define MICROPY_PY_IO (1)
#define MICROPY_PY_IO_FILEIO (1)
// extra built in names to add to the global namespace
extern const struct _mp_obj_fun_native_t mp_builtin_help_obj;

4
stmhal/qstrdefsport.h
View File

@ -66,6 +66,10 @@ Q(0:/)
Q(0:/lib)
Q(millis)
// for file class
Q(seek)
Q(tell)
// for RTC class
Q(RTC)
Q(info)