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Add unbuffered readline() implementation for Raw I/O files.

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This commit is contained in:
Paul Sokolovsky 2014-01-15 23:39:44 +02:00
parent 24224d7c72
commit 9953ca432b
3 changed files with 46 additions and 0 deletions
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44
py/stream.c
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@ -92,6 +92,50 @@ static mp_obj_t stream_readall(mp_obj_t self_in) {
return mp_obj_new_str(qstr_from_str_take(buf, total_size + 1));
}
// Unbuffered, inefficient implementation of readline() for raw I/O files.
static mp_obj_t stream_unbuffered_readline(int n_args, const mp_obj_t *args) {
struct _mp_obj_base_t *o = (struct _mp_obj_base_t *)args[0];
if (o->type->stream_p.read == NULL) {
// CPython: io.UnsupportedOperation, OSError subclass
nlr_jump(mp_obj_new_exception_msg(MP_QSTR_OSError, "Operation not supported"));
}
machine_int_t max_size = -1;
if (n_args > 1) {
max_size = MP_OBJ_SMALL_INT_VALUE(args[1]);
}
vstr_t *vstr;
if (max_size != -1) {
vstr = vstr_new_size(max_size + 1); // TODO: \0
} else {
vstr = vstr_new();
}
int error;
while (max_size == -1 || max_size-- != 0) {
char *p = vstr_add_len(vstr, 1);
if (p == NULL) {
// TODO
nlr_jump(mp_obj_new_exception_msg_varg(MP_QSTR_OSError/*MP_QSTR_RuntimeError*/, "Out of memory"));
}
machine_int_t out_sz = o->type->stream_p.read(o, p, 1, &error);
if (out_sz == -1) {
nlr_jump(mp_obj_new_exception_msg_varg(MP_QSTR_OSError, "[Errno %d]", error));
}
if (out_sz == 0 || *p == '\n') {
break;
}
}
// TODO: \0
vstr_add_byte(vstr, 0);
vstr_shrink(vstr);
return mp_obj_new_str(qstr_from_str_take(vstr_str(vstr), vstr_len(vstr)));
}
MP_DEFINE_CONST_FUN_OBJ_2(mp_stream_read_obj, stream_read);
MP_DEFINE_CONST_FUN_OBJ_1(mp_stream_readall_obj, stream_readall);
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_stream_unbuffered_readline_obj, 1, 2, stream_unbuffered_readline);
MP_DEFINE_CONST_FUN_OBJ_2(mp_stream_write_obj, stream_write);

1
py/stream.h
View File

@ -1,3 +1,4 @@
extern const mp_obj_fun_native_t mp_stream_read_obj;
extern const mp_obj_fun_native_t mp_stream_readall_obj;
extern const mp_obj_fun_native_t mp_stream_unbuffered_readline_obj;
extern const mp_obj_fun_native_t mp_stream_write_obj;

1
unix/file.c
View File

@ -91,6 +91,7 @@ static mp_obj_t fdfile_make_new(mp_obj_t type_in, int n_args, const mp_obj_t *ar
static const mp_method_t rawfile_type_methods[] = {
{ "read", &mp_stream_read_obj },
{ "readall", &mp_stream_readall_obj },
{ "readline", &mp_stream_unbuffered_readline_obj},
{ "write", &mp_stream_write_obj },
{ "close", &fdfile_close_obj },
{ NULL, NULL },