Function aux_lines

3rd/lua-5.4.3/src/liolib.c:363–371

** Auxiliary function to create the iteration function for 'lines'. ** The iteration function is a closure over 'io_readline', with ** the following upvalues: ** 1) The file being read (first value in the stack) ** 2) the number of arguments to read ** 3) a boolean, true iff file has to be closed when finished ('toclose') ** *) a variable number of format arguments (rest of the stack) */

** *) a variable number of format arguments (rest of the stack)
*/
static void aux_lines (lua_State *L, int toclose) {
  int n = lua_gettop(L) - 1;  /* number of arguments to read */
  luaL_argcheck(L, n <= MAXARGLINE, MAXARGLINE + 2, "too many arguments");
  lua_pushvalue(L, 1);  /* file */
  lua_pushinteger(L, n);  /* number of arguments to read */
  lua_pushboolean(L, toclose);  /* close/not close file when finished */
  lua_rotate(L, 2, 3);  /* move the three values to their positions */
  lua_pushcclosure(L, io_readline, 3 + n);
}


static int f_lines (lua_State *L) {