Function loadfunc

3rd/lua-5.4.3/src/loadlib.c:562–577

** Try to find a load function for module 'modname' at file 'filename'. ** First, change '.' to '_' in 'modname'; then, if 'modname' has ** the form X-Y (that is, it has an "ignore mark"), build a function ** name "luaopen_X" and look for it. (For compatibility, if that ** fails, it also tries "luaopen_Y".) If there is no ignore mark, ** look for a function named "luaopen_modname". */

** look for a function named "luaopen_modname".
*/
static int loadfunc (lua_State *L, const char *filename, const char *modname) {
  const char *openfunc;
  const char *mark;
  modname = luaL_gsub(L, modname, ".", LUA_OFSEP);
  mark = strchr(modname, *LUA_IGMARK);
  if (mark) {
    int stat;
    openfunc = lua_pushlstring(L, modname, mark - modname);
    openfunc = lua_pushfstring(L, LUA_POF"%s", openfunc);
    stat = lookforfunc(L, filename, openfunc);
    if (stat != ERRFUNC) return stat;
    modname = mark + 1;  /* else go ahead and try old-style name */
  }
  openfunc = lua_pushfstring(L, LUA_POF"%s", modname);
  return lookforfunc(L, filename, openfunc);
}


static int searcher_C (lua_State *L) {