1 files changed, 93 insertions, 0 deletions
diff --git a/extmod/uos_dupterm.c b/extmod/uos_dupterm.c
new file mode 100644
index 0000000000..d888099dff
--- /dev/null
+++ b/extmod/uos_dupterm.c
@@ -0,0 +1,93 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 Paul Sokolovsky
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <errno.h>
+#include <string.h>
+#include "py/mpconfig.h"
+
+#include "py/nlr.h"
+#include "py/runtime.h"
+#include "py/objtuple.h"
+#include "py/objarray.h"
+#include "py/stream.h"
+
+#if MICROPY_PY_OS_DUPTERM
+
+void mp_uos_deactivate(const char *msg, mp_obj_t exc) {
+    mp_obj_t term = MP_STATE_PORT(term_obj);
+    MP_STATE_PORT(term_obj) = NULL;
+    mp_printf(&mp_plat_print, msg);
+    if (exc != MP_OBJ_NULL) {
+        mp_obj_print_exception(&mp_plat_print, exc);
+    }
+    mp_stream_close(term);
+}
+
+void mp_uos_dupterm_tx_strn(const char *str, size_t len) {
+    if (MP_STATE_PORT(term_obj) != MP_OBJ_NULL) {
+        nlr_buf_t nlr;
+        if (nlr_push(&nlr) == 0) {
+            mp_obj_t write_m[3];
+            mp_load_method(MP_STATE_PORT(term_obj), MP_QSTR_write, write_m);
+
+            mp_obj_array_t *arr = MP_OBJ_TO_PTR(MP_STATE_PORT(dupterm_arr_obj));
+            void *org_items = arr->items;
+            arr->items = (void*)str;
+            arr->len = len;
+            write_m[2] = MP_STATE_PORT(dupterm_arr_obj);
+            mp_call_method_n_kw(1, 0, write_m);
+            arr = MP_OBJ_TO_PTR(MP_STATE_PORT(dupterm_arr_obj));
+            arr->items = org_items;
+            arr->len = 1;
+            nlr_pop();
+        } else {
+            mp_uos_deactivate("dupterm: Exception in write() method, deactivating: ", nlr.ret_val);
+        }
+    }
+}
+
+STATIC mp_obj_t mp_uos_dupterm(mp_uint_t n_args, const mp_obj_t *args) {
+    if (n_args == 0) {
+        if (MP_STATE_PORT(term_obj) == MP_OBJ_NULL) {
+            return mp_const_none;
+        } else {
+            return MP_STATE_PORT(term_obj);
+        }
+    } else {
+        if (args[0] == mp_const_none) {
+            MP_STATE_PORT(term_obj) = MP_OBJ_NULL;
+        } else {
+            MP_STATE_PORT(term_obj) = args[0];
+            if (MP_STATE_PORT(dupterm_arr_obj) == MP_OBJ_NULL) {
+                MP_STATE_PORT(dupterm_arr_obj) = mp_obj_new_bytearray(1, "");
+            }
+        }
+        return mp_const_none;
+    }
+}
+MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_uos_dupterm_obj, 0, 1, mp_uos_dupterm);
+
+#endif