The addition of setvbuf to liolib.c is welcome, however can we have an extra parameter to specifiy the buffer size? liolib.c 421 - return pushresult(L, setvbuf(f, NULL, mode[op], 0) == 0, NULL); + return pushresult(L, setvbuf(f, NULL, mode[op], + luaL_optinteger(L,3,0)) == 0, NULL); DB