pub fn buf_init(state: &mut LuaState, buf: &mut LuaBuffer)Expand description
Initialize buf and associate it with state.
Pushes a placeholder light-userdata onto state to anchor the buffer in C.
In Rust the Vec is self-contained; we still push a placeholder for stack-slot
compatibility with code that later calls add_value / push_result.
C: LUALIB_API void luaL_buffinit(lua_State *L, luaL_Buffer *B)