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stmhal: Switch to file.seek() implementation using stream ioctl.

This commit is contained in:
Paul Sokolovsky 2014-11-17 00:16:14 +02:00
parent c7d5500142
commit fa2edabc5c
2 changed files with 33 additions and 38 deletions
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70
stmhal/file.c
View File

@ -114,45 +114,38 @@ mp_obj_t file_obj___exit__(mp_uint_t n_args, const mp_obj_t *args) {
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(file_obj___exit___obj, 4, 4, file_obj___exit__);
mp_obj_t file_obj_seek(mp_uint_t n_args, const mp_obj_t *args) {
pyb_file_obj_t *self = args[0];
mp_int_t offset = mp_obj_get_int(args[1]);
mp_int_t whence = 0;
if (n_args == 3) {
whence = mp_obj_get_int(args[2]);
STATIC mp_uint_t file_obj_ioctl(mp_obj_t o_in, mp_uint_t request, mp_uint_t arg, int *errcode) {
pyb_file_obj_t *self = o_in;
if (request == MP_STREAM_SEEK) {
struct mp_stream_seek_t *s = (struct mp_stream_seek_t*)arg;
switch (s->whence) {
case 0: // SEEK_SET
f_lseek(&self->fp, s->offset);
break;
case 1: // SEEK_CUR
if (s->offset != 0) {
*errcode = ENOTSUP;
return MP_STREAM_ERROR;
}
// no-operation
break;
case 2: // SEEK_END
f_lseek(&self->fp, f_size(&self->fp) + s->offset);
break;
}
s->offset = f_tell(&self->fp);
return 0;
} else {
*errcode = EINVAL;
return MP_STREAM_ERROR;
}
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;
@ -236,7 +229,7 @@ STATIC const mp_map_elem_t rawfile_locals_dict_table[] = {
{ MP_OBJ_NEW_QSTR(MP_QSTR_write), (mp_obj_t)&mp_stream_write_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_flush), (mp_obj_t)&file_obj_flush_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_seek), (mp_obj_t)&mp_stream_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 },
@ -249,6 +242,7 @@ STATIC MP_DEFINE_CONST_DICT(rawfile_locals_dict, rawfile_locals_dict_table);
STATIC const mp_stream_p_t fileio_stream_p = {
.read = file_obj_read,
.write = file_obj_write,
.ioctl = file_obj_ioctl,
};
const mp_obj_type_t mp_type_fileio = {

1
stmhal/mpconfigport.h
View File

@ -124,6 +124,7 @@ typedef int mp_int_t; // must be pointer size
typedef unsigned int mp_uint_t; // must be pointer size
typedef void *machine_ptr_t; // must be of pointer size
typedef const void *machine_const_ptr_t; // must be of pointer size
typedef long mp_off_t;
// We have inlined IRQ functions for efficiency (they are generally
// 1 machine instruction).