Function pairsmeta

freebsd/contrib/openzfs/module/lua/lbaselib.c:178–192

static int pairsmeta (lua_State *L, const char *method, int iszero,
                      lua_CFunction iter) {
  if (!luaL_getmetafield(L, 1, method)) {  /* no metamethod? */
    luaL_checktype(L, 1, LUA_TTABLE);  /* argument must be a table */
    lua_pushcfunction(L, iter);  /* will return generator, */
    lua_pushvalue(L, 1);  /* state, */
    if (iszero) lua_pushinteger(L, 0);  /* and initial value */
    else lua_pushnil(L);
  }
  else {
    lua_pushvalue(L, 1);  /* argument 'self' to metamethod */
    lua_call(L, 1, 3);  /* get 3 values from metamethod */
  }
  return 3;
}


static int luaB_next (lua_State *L) {