improve bytes for lua

1 files changed, 58 insertions, 0 deletions

diff --git a/core/src/xmake/libc/strndup.c b/core/src/xmake/libc/strndup.c
new file mode 100644
index 000000000..e0e1a1e02
--- /dev/null
+++ b/core/src/xmake/libc/strndup.c
@@ -0,0 +1,58 @@
+/*!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, TBOOX Open Source Group.
+ *
+ * @author      ruki
+ * @file        strndup.c
+ *
+ */
+
+/* //////////////////////////////////////////////////////////////////////////////////////
+ * trace
+ */
+#define TB_TRACE_MODULE_NAME    "strndup"
+#define TB_TRACE_MODULE_DEBUG   (0)
+
+/* //////////////////////////////////////////////////////////////////////////////////////
+ * includes
+ */
+#include "prefix.h"
+
+/* //////////////////////////////////////////////////////////////////////////////////////
+ * implementation
+ */
+tb_int_t xm_libc_strndup(lua_State* lua)
+{
+    // check
+    tb_assert_and_check_return_val(lua, 0);
+
+    // check arguments?
+    if (!xm_lua_ispointer(lua, 1) || !xm_lua_ispointer(lua, 2) || !lua_isnumber(lua, 3))
+        xm_libc_return_error(lua, "strndup(invalid args)!");
+
+    // do strndup
+    tb_char_t const* s = tb_null;
+    if (xm_lua_ispointer(lua, 1))
+        s = (tb_char_t const*)xm_lua_topointer(lua, 1);
+    else if (lua_isstring(lua, 2))
+        s = lua_tostring(lua, 2);
+    else xm_libc_return_error(lua, "strndup(invalid args)!");
+    tb_int_t n = (tb_int_t)lua_tointeger(lua, 2);
+    if (s && n >= 0)
+        lua_pushlstring(lua, s, n);
+    else lua_pushliteral(lua, "");
+    return 1;
+}
+