Add unbuffered readline() implementation for Raw I/O files.
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24224d7c72
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44
py/stream.c
44
py/stream.c
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@ -92,6 +92,50 @@ static mp_obj_t stream_readall(mp_obj_t self_in) {
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return mp_obj_new_str(qstr_from_str_take(buf, total_size + 1));
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}
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// Unbuffered, inefficient implementation of readline() for raw I/O files.
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static mp_obj_t stream_unbuffered_readline(int n_args, const mp_obj_t *args) {
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struct _mp_obj_base_t *o = (struct _mp_obj_base_t *)args[0];
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if (o->type->stream_p.read == NULL) {
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// CPython: io.UnsupportedOperation, OSError subclass
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nlr_jump(mp_obj_new_exception_msg(MP_QSTR_OSError, "Operation not supported"));
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}
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machine_int_t max_size = -1;
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if (n_args > 1) {
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max_size = MP_OBJ_SMALL_INT_VALUE(args[1]);
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}
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vstr_t *vstr;
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if (max_size != -1) {
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vstr = vstr_new_size(max_size + 1); // TODO: \0
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} else {
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vstr = vstr_new();
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}
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int error;
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while (max_size == -1 || max_size-- != 0) {
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char *p = vstr_add_len(vstr, 1);
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if (p == NULL) {
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// TODO
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nlr_jump(mp_obj_new_exception_msg_varg(MP_QSTR_OSError/*MP_QSTR_RuntimeError*/, "Out of memory"));
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}
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machine_int_t out_sz = o->type->stream_p.read(o, p, 1, &error);
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if (out_sz == -1) {
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nlr_jump(mp_obj_new_exception_msg_varg(MP_QSTR_OSError, "[Errno %d]", error));
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}
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if (out_sz == 0 || *p == '\n') {
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break;
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}
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}
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// TODO: \0
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vstr_add_byte(vstr, 0);
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vstr_shrink(vstr);
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return mp_obj_new_str(qstr_from_str_take(vstr_str(vstr), vstr_len(vstr)));
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}
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MP_DEFINE_CONST_FUN_OBJ_2(mp_stream_read_obj, stream_read);
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MP_DEFINE_CONST_FUN_OBJ_1(mp_stream_readall_obj, stream_readall);
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MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_stream_unbuffered_readline_obj, 1, 2, stream_unbuffered_readline);
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MP_DEFINE_CONST_FUN_OBJ_2(mp_stream_write_obj, stream_write);
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@ -1,3 +1,4 @@
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extern const mp_obj_fun_native_t mp_stream_read_obj;
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extern const mp_obj_fun_native_t mp_stream_readall_obj;
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extern const mp_obj_fun_native_t mp_stream_unbuffered_readline_obj;
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extern const mp_obj_fun_native_t mp_stream_write_obj;
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@ -91,6 +91,7 @@ static mp_obj_t fdfile_make_new(mp_obj_t type_in, int n_args, const mp_obj_t *ar
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static const mp_method_t rawfile_type_methods[] = {
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{ "read", &mp_stream_read_obj },
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{ "readall", &mp_stream_readall_obj },
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{ "readline", &mp_stream_unbuffered_readline_obj},
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{ "write", &mp_stream_write_obj },
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{ "close", &fdfile_close_obj },
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{ NULL, NULL },
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