56 lines
2.1 KiB
C
56 lines
2.1 KiB
C
#include <string.h>
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#include "nlr.h"
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#include "misc.h"
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#include "mpconfig.h"
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#include "mpqstr.h"
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#include "obj.h"
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#include "stream.h"
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// This file defines generic Python stream read/write methods which
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// dispatch to the underlying stream interface of an object.
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static mp_obj_t stream_read(mp_obj_t self_in, mp_obj_t arg) {
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struct _mp_obj_base_t *o = (struct _mp_obj_base_t *)self_in;
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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 sz = mp_obj_get_int(arg);
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// +1 because so far we mark end of string with \0
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char *buf = m_new(char, sz + 1);
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int error;
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machine_int_t out_sz = o->type->stream_p.read(self_in, buf, sz, &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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} else {
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buf[out_sz] = 0;
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return mp_obj_new_str(qstr_from_str_take(buf, /*out_sz,*/ sz + 1));
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}
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}
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static mp_obj_t stream_write(mp_obj_t self_in, mp_obj_t arg) {
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struct _mp_obj_base_t *o = (struct _mp_obj_base_t *)self_in;
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if (o->type->stream_p.write == 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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const char *buf = qstr_str(mp_obj_get_qstr(arg));
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machine_int_t sz = strlen(buf);
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int error;
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machine_int_t out_sz = o->type->stream_p.write(self_in, buf, sz, &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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} else {
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// http://docs.python.org/3/library/io.html#io.RawIOBase.write
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// "None is returned if the raw stream is set not to block and no single byte could be readily written to it."
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// Do they mean that instead of 0 they return None?
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return MP_OBJ_NEW_SMALL_INT(out_sz);
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}
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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_2(mp_stream_write_obj, stream_write);
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