Function db_traceback

3rd/lua-5.4.3/src/ldblib.c:435–446

static int db_traceback (lua_State *L) {
  int arg;
  lua_State *L1 = getthread(L, &arg);
  const char *msg = lua_tostring(L, arg + 1);
  if (msg == NULL && !lua_isnoneornil(L, arg + 1))  /* non-string 'msg'? */
    lua_pushvalue(L, arg + 1);  /* return it untouched */
  else {
    int level = (int)luaL_optinteger(L, arg + 2, (L == L1) ? 1 : 0);
    luaL_traceback(L, L1, msg, level);
  }
  return 1;
}


static int db_setcstacklimit (lua_State *L) {