add utf8.reverse

1 files changed, 57 insertions, 0 deletions

diff --git a/core/src/xmake/utf8/reverse.c b/core/src/xmake/utf8/reverse.c
new file mode 100644
index 000000000..0c0b7aaf7
--- /dev/null
+++ b/core/src/xmake/utf8/reverse.c
@@ -0,0 +1,57 @@
+/*!A cross-platform build utility based on Lua
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Copyright (C) 2015-present, Xmake Open Source Community.
+ *
+ * @author      ruki
+ * @file        reverse.c
+ *
+ */
+
+/* //////////////////////////////////////////////////////////////////////////////////////
+ * includes
+ */
+#include "utf8.h"
+
+/* //////////////////////////////////////////////////////////////////////////////////////
+ * implementation
+ */
+
+/* utf8.reverse(s)
+ */
+tb_int_t xm_utf8_reverse(lua_State *lua) {
+    size_t len;
+    tb_char_t const* s = luaL_checklstring(lua, 1, &len);
+    if (len == 0) {
+        lua_pushliteral(lua, "");
+        return 1;
+    }
+
+    // do reverse
+    if (len < 1024) {
+        tb_char_t buf[1024 + 1];
+        xm_utf8_reverse_impl(s, len, buf);
+        lua_pushlstring(lua, buf, len);
+    } else {
+        tb_char_t* buf = (tb_char_t*)tb_malloc_bytes(len + 1);
+        if (buf) {
+            xm_utf8_reverse_impl(s, len, buf);
+            lua_pushlstring(lua, buf, len);
+            tb_free(buf);
+        } else {
+            lua_pushnil(lua);
+        }
+    }
+    return 1;
+}