move larduinolib.c into ART's repo, add lua external library example

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2405 bbd45198-f89e-11dd-88c7-29a3b14d5316

components/external/lua/exlibs/lexamplelib.c

@@ -0,0 +1,75 @@
+/**
+ * example of adding lua external library
+ */
+
+#include "lua.h"
+#include "lauxlib.h"
+
+#include "lexlibs.h"
+
+#define VERSION         1
+
+int example_hello(lua_State *L)
+{
+    rt_kprintf("Hello, Lua on RT-Thead!\n");
+
+    return 0;
+}
+
+int example_print(lua_State *L)
+{
+    int n = lua_gettop(L);
+    int i;
+
+    for (i=1; i<=n; i++)
+    {
+        if (i>1)
+            rt_kprintf("\t");
+
+        if (lua_isstring(L,i))
+            rt_kprintf("%s",lua_tostring(L,i));
+        else if (lua_isnumber(L, i))
+            rt_kprintf("%d",lua_tointeger(L,i));
+        else if (lua_isnil(L,i))
+            rt_kprintf("%s","nil");
+        else if (lua_isboolean(L,i))
+            rt_kprintf("%s",lua_toboolean(L,i) ? "true" : "false");
+        else
+            rt_kprintf("%s:%p",luaL_typename(L,i),lua_topointer(L,i));
+    }
+
+    rt_kprintf("\n");
+
+    return 0;
+}
+
+    
+#define MIN_OPT_LEVEL       2
+#include "lrodefs.h"
+
+const LUA_REG_TYPE example_map[] =
+{
+    {LSTRKEY("hello"), LFUNCVAL(example_hello)},
+    {LSTRKEY("print"), LFUNCVAL(example_print)},
+#if LUA_OPTIMIZE_MEMORY > 0
+    {LSTRKEY("version"), LNUMVAL(VERSION)},
+#endif
+    {LNILKEY, LNILVAL}
+};
+
+/**
+ * Open exmaple library
+ */
+LUALIB_API int luaopen_example(lua_State *L)
+{
+#if LUA_OPTIMIZE_MEMORY > 0
+    return 0;
+#else
+    luaL_register(L, EXLIB_EXAMPLE, example_map);
+    lua_pushnumber(L, VERSION);
+    lua_setfield(L, -2, "version");
+    return 1;
+#endif
+}
+
+