LXR syslinux/com32/lua/src/loadlib.c

   1/*
   2** $Id: loadlib.c,v 1.52.1.4 2009/09/09 13:17:16 roberto Exp $
   3** Dynamic library loader for Lua
   4** See Copyright Notice in lua.h
   5**
   6** This module contains an implementation of loadlib for Unix systems
   7** that have dlfcn, an implementation for Darwin (Mac OS X), an
   8** implementation for Windows, and a stub for other systems.
   9*/
  10
  11
  12#include <stdlib.h>
  13#include <string.h>
  14
  15
  16#define loadlib_c
  17#define LUA_LIB
  18
  19#include "lua.h"
  20
  21#include "lauxlib.h"
  22#include "lualib.h"
  23
  24
  25/* prefix for open functions in C libraries */
  26#define LUA_POF         "luaopen_"
  27
  28/* separator for open functions in C libraries */
  29#define LUA_OFSEP       "_"
  30
  31
  32#define LIBPREFIX       "LOADLIB: "
  33
  34#define POF             LUA_POF
  35#define LIB_FAIL        "open"
  36
  37
  38/* error codes for ll_loadfunc */
  39#define ERRLIB          1
  40#define ERRFUNC         2
  41
  42#define setprogdir(L)           ((void)0)
  43
  44
  45static void ll_unloadlib (void *lib);
  46static void *ll_load (lua_State *L, const char *path);
  47static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym);
  48
  49
  50
  51#if defined(LUA_DL_DLOPEN)
  52/*
  53** {========================================================================
  54** This is an implementation of loadlib based on the dlfcn interface.
  55** The dlfcn interface is available in Linux, SunOS, Solaris, IRIX, FreeBSD,
  56** NetBSD, AIX 4.2, HPUX 11, and  probably most other Unix flavors, at least
  57** as an emulation layer on top of native functions.
  58** =========================================================================
  59*/
  60
  61#include <dlfcn.h>
  62
  63static void ll_unloadlib (void *lib) {
  64  dlclose(lib);
  65}
  66
  67
  68static void *ll_load (lua_State *L, const char *path) {
  69  void *lib = dlopen(path, RTLD_NOW);
  70  if (lib == NULL) lua_pushstring(L, dlerror());
  71  return lib;
  72}
  73
  74
  75static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {
  76  lua_CFunction f = (lua_CFunction)dlsym(lib, sym);
  77  if (f == NULL) lua_pushstring(L, dlerror());
  78  return f;
  79}
  80
  81/* }====================================================== */
  82
  83
  84
  85#elif defined(LUA_DL_DLL)
  86/*
  87** {======================================================================
  88** This is an implementation of loadlib for Windows using native functions.
  89** =======================================================================
  90*/
  91
  92#include <windows.h>
  93
  94
  95#undef setprogdir
  96
  97static void setprogdir (lua_State *L) {
  98  char buff[MAX_PATH + 1];
  99  char *lb;
 100  DWORD nsize = sizeof(buff)/sizeof(char);
 101  DWORD n = GetModuleFileNameA(NULL, buff, nsize);
 102  if (n == 0 || n == nsize || (lb = strrchr(buff, '\\')) == NULL)
 103    luaL_error(L, "unable to get ModuleFileName");
 104  else {
 105    *lb = '\0';
 106    luaL_gsub(L, lua_tostring(L, -1), LUA_EXECDIR, buff);
 107    lua_remove(L, -2);  /* remove original string */
 108  }
 109}
 110
 111
 112static void pusherror (lua_State *L) {
 113  int error = GetLastError();
 114  char buffer[128];
 115  if (FormatMessageA(FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_FROM_SYSTEM,
 116      NULL, error, 0, buffer, sizeof(buffer), NULL))
 117    lua_pushstring(L, buffer);
 118  else
 119    lua_pushfstring(L, "system error %d\n", error);
 120}
 121
 122static void ll_unloadlib (void *lib) {
 123  FreeLibrary((HINSTANCE)lib);
 124}
 125
 126
 127static void *ll_load (lua_State *L, const char *path) {
 128  HINSTANCE lib = LoadLibraryA(path);
 129  if (lib == NULL) pusherror(L);
 130  return lib;
 131}
 132
 133
 134static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {
 135  lua_CFunction f = (lua_CFunction)GetProcAddress((HINSTANCE)lib, sym);
 136  if (f == NULL) pusherror(L);
 137  return f;
 138}
 139
 140/* }====================================================== */
 141
 142
 143
 144#elif defined(LUA_DL_DYLD)
 145/*
 146** {======================================================================
 147** Native Mac OS X / Darwin Implementation
 148** =======================================================================
 149*/
 150
 151#include <mach-o/dyld.h>
 152
 153
 154/* Mac appends a `_' before C function names */
 155#undef POF
 156#define POF     "_" LUA_POF
 157
 158
 159static void pusherror (lua_State *L) {
 160  const char *err_str;
 161  const char *err_file;
 162  NSLinkEditErrors err;
 163  int err_num;
 164  NSLinkEditError(&err, &err_num, &err_file, &err_str);
 165  lua_pushstring(L, err_str);
 166}
 167
 168
 169static const char *errorfromcode (NSObjectFileImageReturnCode ret) {
 170  switch (ret) {
 171    case NSObjectFileImageInappropriateFile:
 172      return "file is not a bundle";
 173    case NSObjectFileImageArch:
 174      return "library is for wrong CPU type";
 175    case NSObjectFileImageFormat:
 176      return "bad format";
 177    case NSObjectFileImageAccess:
 178      return "cannot access file";
 179    case NSObjectFileImageFailure:
 180    default:
 181      return "unable to load library";
 182  }
 183}
 184
 185
 186static void ll_unloadlib (void *lib) {
 187  NSUnLinkModule((NSModule)lib, NSUNLINKMODULE_OPTION_RESET_LAZY_REFERENCES);
 188}
 189
 190
 191static void *ll_load (lua_State *L, const char *path) {
 192  NSObjectFileImage img;
 193  NSObjectFileImageReturnCode ret;
 194  /* this would be a rare case, but prevents crashing if it happens */
 195  if(!_dyld_present()) {
 196    lua_pushliteral(L, "dyld not present");
 197    return NULL;
 198  }
 199  ret = NSCreateObjectFileImageFromFile(path, &img);
 200  if (ret == NSObjectFileImageSuccess) {
 201    NSModule mod = NSLinkModule(img, path, NSLINKMODULE_OPTION_PRIVATE |
 202                       NSLINKMODULE_OPTION_RETURN_ON_ERROR);
 203    NSDestroyObjectFileImage(img);
 204    if (mod == NULL) pusherror(L);
 205    return mod;
 206  }
 207  lua_pushstring(L, errorfromcode(ret));
 208  return NULL;
 209}
 210
 211
 212static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {
 213  NSSymbol nss = NSLookupSymbolInModule((NSModule)lib, sym);
 214  if (nss == NULL) {
 215    lua_pushfstring(L, "symbol " LUA_QS " not found", sym);
 216    return NULL;
 217  }
 218  return (lua_CFunction)NSAddressOfSymbol(nss);
 219}
 220
 221/* }====================================================== */
 222
 223
 224
 225#else
 226/*
 227** {======================================================
 228** Fallback for other systems
 229** =======================================================
 230*/
 231
 232#undef LIB_FAIL
 233#define LIB_FAIL        "absent"
 234
 235
 236#define DLMSG   "dynamic libraries not enabled; check your Lua installation"
 237
 238
 239static void ll_unloadlib (void *lib) {
 240  (void)lib;  /* to avoid warnings */
 241}
 242
 243
 244static void *ll_load (lua_State *L, const char *path) {
 245  (void)path;  /* to avoid warnings */
 246  lua_pushliteral(L, DLMSG);
 247  return NULL;
 248}
 249
 250
 251static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {
 252  (void)lib; (void)sym;  /* to avoid warnings */
 253  lua_pushliteral(L, DLMSG);
 254  return NULL;
 255}
 256
 257/* }====================================================== */
 258#endif
 259
 260
 261
 262static void **ll_register (lua_State *L, const char *path) {
 263  void **plib;
 264  lua_pushfstring(L, "%s%s", LIBPREFIX, path);
 265  lua_gettable(L, LUA_REGISTRYINDEX);  /* check library in registry? */
 266  if (!lua_isnil(L, -1))  /* is there an entry? */
 267    plib = (void **)lua_touserdata(L, -1);
 268  else {  /* no entry yet; create one */
 269    lua_pop(L, 1);
 270    plib = (void **)lua_newuserdata(L, sizeof(const void *));
 271    *plib = NULL;
 272    luaL_getmetatable(L, "_LOADLIB");
 273    lua_setmetatable(L, -2);
 274    lua_pushfstring(L, "%s%s", LIBPREFIX, path);
 275    lua_pushvalue(L, -2);
 276    lua_settable(L, LUA_REGISTRYINDEX);
 277  }
 278  return plib;
 279}
 280
 281
 282/*
 283** __gc tag method: calls library's `ll_unloadlib' function with the lib
 284** handle
 285*/
 286static int gctm (lua_State *L) {
 287  void **lib = (void **)luaL_checkudata(L, 1, "_LOADLIB");
 288  if (*lib) ll_unloadlib(*lib);
 289  *lib = NULL;  /* mark library as closed */
 290  return 0;
 291}
 292
 293
 294static int ll_loadfunc (lua_State *L, const char *path, const char *sym) {
 295  void **reg = ll_register(L, path);
 296  if (*reg == NULL) *reg = ll_load(L, path);
 297  if (*reg == NULL)
 298    return ERRLIB;  /* unable to load library */
 299  else {
 300    lua_CFunction f = ll_sym(L, *reg, sym);
 301    if (f == NULL)
 302      return ERRFUNC;  /* unable to find function */
 303    lua_pushcfunction(L, f);
 304    return 0;  /* return function */
 305  }
 306}
 307
 308
 309static int ll_loadlib (lua_State *L) {
 310  const char *path = luaL_checkstring(L, 1);
 311  const char *init = luaL_checkstring(L, 2);
 312  int stat = ll_loadfunc(L, path, init);
 313  if (stat == 0)  /* no errors? */
 314    return 1;  /* return the loaded function */
 315  else {  /* error; error message is on stack top */
 316    lua_pushnil(L);
 317    lua_insert(L, -2);
 318    lua_pushstring(L, (stat == ERRLIB) ?  LIB_FAIL : "init");
 319    return 3;  /* return nil, error message, and where */
 320  }
 321}
 322
 323
 324
 325/*
 326** {======================================================
 327** 'require' function
 328** =======================================================
 329*/
 330
 331
 332static int readable (const char *filename) {
 333  FILE *f = fopen(filename, "r");  /* try to open file */
 334  if (f == NULL) return 0;  /* open failed */
 335  fclose(f);
 336  return 1;
 337}
 338
 339
 340static const char *pushnexttemplate (lua_State *L, const char *path) {
 341  const char *l;
 342  while (*path == *LUA_PATHSEP) path++;  /* skip separators */
 343  if (*path == '\0') return NULL;  /* no more templates */
 344  l = strchr(path, *LUA_PATHSEP);  /* find next separator */
 345  if (l == NULL) l = path + strlen(path);
 346  lua_pushlstring(L, path, l - path);  /* template */
 347  return l;
 348}
 349
 350
 351static const char *findfile (lua_State *L, const char *name,
 352                                           const char *pname) {
 353  const char *path;
 354  name = luaL_gsub(L, name, ".", LUA_DIRSEP);
 355  lua_getfield(L, LUA_ENVIRONINDEX, pname);
 356  path = lua_tostring(L, -1);
 357  if (path == NULL)
 358    luaL_error(L, LUA_QL("package.%s") " must be a string", pname);
 359  lua_pushliteral(L, "");  /* error accumulator */
 360  while ((path = pushnexttemplate(L, path)) != NULL) {
 361    const char *filename;
 362    filename = luaL_gsub(L, lua_tostring(L, -1), LUA_PATH_MARK, name);
 363    lua_remove(L, -2);  /* remove path template */
 364    if (readable(filename))  /* does file exist and is readable? */
 365      return filename;  /* return that file name */
 366    lua_pushfstring(L, "\n\tno file " LUA_QS, filename);
 367    lua_remove(L, -2);  /* remove file name */
 368    lua_concat(L, 2);  /* add entry to possible error message */
 369  }
 370  return NULL;  /* not found */
 371}
 372
 373
 374static void loaderror (lua_State *L, const char *filename) {
 375  luaL_error(L, "error loading module " LUA_QS " from file " LUA_QS ":\n\t%s",
 376                lua_tostring(L, 1), filename, lua_tostring(L, -1));
 377}
 378
 379
 380static int loader_Lua (lua_State *L) {
 381  const char *filename;
 382  const char *name = luaL_checkstring(L, 1);
 383  filename = findfile(L, name, "path");
 384  if (filename == NULL) return 1;  /* library not found in this path */
 385  if (luaL_loadfile(L, filename) != 0)
 386    loaderror(L, filename);
 387  return 1;  /* library loaded successfully */
 388}
 389
 390
 391static const char *mkfuncname (lua_State *L, const char *modname) {
 392  const char *funcname;
 393  const char *mark = strchr(modname, *LUA_IGMARK);
 394  if (mark) modname = mark + 1;
 395  funcname = luaL_gsub(L, modname, ".", LUA_OFSEP);
 396  funcname = lua_pushfstring(L, POF"%s", funcname);
 397  lua_remove(L, -2);  /* remove 'gsub' result */
 398  return funcname;
 399}
 400
 401
 402static int loader_C (lua_State *L) {
 403  const char *funcname;
 404  const char *name = luaL_checkstring(L, 1);
 405  const char *filename = findfile(L, name, "cpath");
 406  if (filename == NULL) return 1;  /* library not found in this path */
 407  funcname = mkfuncname(L, name);
 408  if (ll_loadfunc(L, filename, funcname) != 0)
 409    loaderror(L, filename);
 410  return 1;  /* library loaded successfully */
 411}
 412
 413
 414static int loader_Croot (lua_State *L) {
 415  const char *funcname;
 416  const char *filename;
 417  const char *name = luaL_checkstring(L, 1);
 418  const char *p = strchr(name, '.');
 419  int stat;
 420  if (p == NULL) return 0;  /* is root */
 421  lua_pushlstring(L, name, p - name);
 422  filename = findfile(L, lua_tostring(L, -1), "cpath");
 423  if (filename == NULL) return 1;  /* root not found */
 424  funcname = mkfuncname(L, name);
 425  if ((stat = ll_loadfunc(L, filename, funcname)) != 0) {
 426    if (stat != ERRFUNC) loaderror(L, filename);  /* real error */
 427    lua_pushfstring(L, "\n\tno module " LUA_QS " in file " LUA_QS,
 428                       name, filename);
 429    return 1;  /* function not found */
 430  }
 431  return 1;
 432}
 433
 434
 435static int loader_preload (lua_State *L) {
 436  const char *name = luaL_checkstring(L, 1);
 437  lua_getfield(L, LUA_ENVIRONINDEX, "preload");
 438  if (!lua_istable(L, -1))
 439    luaL_error(L, LUA_QL("package.preload") " must be a table");
 440  lua_getfield(L, -1, name);
 441  if (lua_isnil(L, -1))  /* not found? */
 442    lua_pushfstring(L, "\n\tno field package.preload['%s']", name);
 443  return 1;
 444}
 445
 446
 447static const int sentinel_ = 0;
 448#define sentinel        ((void *)&sentinel_)
 449
 450
 451static int ll_require (lua_State *L) {
 452  const char *name = luaL_checkstring(L, 1);
 453  int i;
 454  lua_settop(L, 1);  /* _LOADED table will be at index 2 */
 455  lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
 456  lua_getfield(L, 2, name);
 457  if (lua_toboolean(L, -1)) {  /* is it there? */
 458    if (lua_touserdata(L, -1) == sentinel)  /* check loops */
 459      luaL_error(L, "loop or previous error loading module " LUA_QS, name);
 460    return 1;  /* package is already loaded */
 461  }
 462  /* else must load it; iterate over available loaders */
 463  lua_getfield(L, LUA_ENVIRONINDEX, "loaders");
 464  if (!lua_istable(L, -1))
 465    luaL_error(L, LUA_QL("package.loaders") " must be a table");
 466  lua_pushliteral(L, "");  /* error message accumulator */
 467  for (i=1; ; i++) {
 468    lua_rawgeti(L, -2, i);  /* get a loader */
 469    if (lua_isnil(L, -1))
 470      luaL_error(L, "module " LUA_QS " not found:%s",
 471                    name, lua_tostring(L, -2));
 472    lua_pushstring(L, name);
 473    lua_call(L, 1, 1);  /* call it */
 474    if (lua_isfunction(L, -1))  /* did it find module? */
 475      break;  /* module loaded successfully */
 476    else if (lua_isstring(L, -1))  /* loader returned error message? */
 477      lua_concat(L, 2);  /* accumulate it */
 478    else
 479      lua_pop(L, 1);
 480  }
 481  lua_pushlightuserdata(L, sentinel);
 482  lua_setfield(L, 2, name);  /* _LOADED[name] = sentinel */
 483  lua_pushstring(L, name);  /* pass name as argument to module */
 484  lua_call(L, 1, 1);  /* run loaded module */
 485  if (!lua_isnil(L, -1))  /* non-nil return? */
 486    lua_setfield(L, 2, name);  /* _LOADED[name] = returned value */
 487  lua_getfield(L, 2, name);
 488  if (lua_touserdata(L, -1) == sentinel) {   /* module did not set a value? */
 489    lua_pushboolean(L, 1);  /* use true as result */
 490    lua_pushvalue(L, -1);  /* extra copy to be returned */
 491    lua_setfield(L, 2, name);  /* _LOADED[name] = true */
 492  }
 493  return 1;
 494}
 495
 496/* }====================================================== */
 497
 498
 499
 500/*
 501** {======================================================
 502** 'module' function
 503** =======================================================
 504*/
 505  
 506
 507static void setfenv (lua_State *L) {
 508  lua_Debug ar;
 509  if (lua_getstack(L, 1, &ar) == 0 ||
 510      lua_getinfo(L, "f", &ar) == 0 ||  /* get calling function */
 511      lua_iscfunction(L, -1))
 512    luaL_error(L, LUA_QL("module") " not called from a Lua function");
 513  lua_pushvalue(L, -2);
 514  lua_setfenv(L, -2);
 515  lua_pop(L, 1);
 516}
 517
 518
 519static void dooptions (lua_State *L, int n) {
 520  int i;
 521  for (i = 2; i <= n; i++) {
 522    lua_pushvalue(L, i);  /* get option (a function) */
 523    lua_pushvalue(L, -2);  /* module */
 524    lua_call(L, 1, 0);
 525  }
 526}
 527
 528
 529static void modinit (lua_State *L, const char *modname) {
 530  const char *dot;
 531  lua_pushvalue(L, -1);
 532  lua_setfield(L, -2, "_M");  /* module._M = module */
 533  lua_pushstring(L, modname);
 534  lua_setfield(L, -2, "_NAME");
 535  dot = strrchr(modname, '.');  /* look for last dot in module name */
 536  if (dot == NULL) dot = modname;
 537  else dot++;
 538  /* set _PACKAGE as package name (full module name minus last part) */
 539  lua_pushlstring(L, modname, dot - modname);
 540  lua_setfield(L, -2, "_PACKAGE");
 541}
 542
 543
 544static int ll_module (lua_State *L) {
 545  const char *modname = luaL_checkstring(L, 1);
 546  int loaded = lua_gettop(L) + 1;  /* index of _LOADED table */
 547  lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
 548  lua_getfield(L, loaded, modname);  /* get _LOADED[modname] */
 549  if (!lua_istable(L, -1)) {  /* not found? */
 550    lua_pop(L, 1);  /* remove previous result */
 551    /* try global variable (and create one if it does not exist) */
 552    if (luaL_findtable(L, LUA_GLOBALSINDEX, modname, 1) != NULL)
 553      return luaL_error(L, "name conflict for module " LUA_QS, modname);
 554    lua_pushvalue(L, -1);
 555    lua_setfield(L, loaded, modname);  /* _LOADED[modname] = new table */
 556  }
 557  /* check whether table already has a _NAME field */
 558  lua_getfield(L, -1, "_NAME");
 559  if (!lua_isnil(L, -1))  /* is table an initialized module? */
 560    lua_pop(L, 1);
 561  else {  /* no; initialize it */
 562    lua_pop(L, 1);
 563    modinit(L, modname);
 564  }
 565  lua_pushvalue(L, -1);
 566  setfenv(L);
 567  dooptions(L, loaded - 1);
 568  return 0;
 569}
 570
 571
 572static int ll_seeall (lua_State *L) {
 573  luaL_checktype(L, 1, LUA_TTABLE);
 574  if (!lua_getmetatable(L, 1)) {
 575    lua_createtable(L, 0, 1); /* create new metatable */
 576    lua_pushvalue(L, -1);
 577    lua_setmetatable(L, 1);
 578  }
 579  lua_pushvalue(L, LUA_GLOBALSINDEX);
 580  lua_setfield(L, -2, "__index");  /* mt.__index = _G */
 581  return 0;
 582}
 583
 584
 585/* }====================================================== */
 586
 587
 588
 589/* auxiliary mark (for internal use) */
 590#define AUXMARK         "\1"
 591
 592static void setpath (lua_State *L, const char *fieldname, const char *envname,
 593                                   const char *def) {
 594#ifdef SYSLINUX
 595  const char *path = NULL;
 596#else
 597  const char *path = getenv(envname);
 598#endif
 599  (void)envname;     /* Shut up gcc */
 600  if (path == NULL)  /* no environment variable? */
 601    lua_pushstring(L, def);  /* use default */
 602  else {
 603    /* replace ";;" by ";AUXMARK;" and then AUXMARK by default path */
 604    path = luaL_gsub(L, path, LUA_PATHSEP LUA_PATHSEP,
 605                              LUA_PATHSEP AUXMARK LUA_PATHSEP);
 606    luaL_gsub(L, path, AUXMARK, def);
 607    lua_remove(L, -2);
 608  }
 609  setprogdir(L);
 610  lua_setfield(L, -2, fieldname);
 611}
 612
 613
 614static const luaL_Reg pk_funcs[] = {
 615  {"loadlib", ll_loadlib},
 616  {"seeall", ll_seeall},
 617  {NULL, NULL}
 618};
 619
 620
 621static const luaL_Reg ll_funcs[] = {
 622  {"module", ll_module},
 623  {"require", ll_require},
 624  {NULL, NULL}
 625};
 626
 627
 628static const lua_CFunction loaders[] =
 629  {loader_preload, loader_Lua, loader_C, loader_Croot, NULL};
 630
 631
 632LUALIB_API int luaopen_package (lua_State *L) {
 633  int i;
 634  /* create new type _LOADLIB */
 635  luaL_newmetatable(L, "_LOADLIB");
 636  lua_pushcfunction(L, gctm);
 637  lua_setfield(L, -2, "__gc");
 638  /* create `package' table */
 639  luaL_register(L, LUA_LOADLIBNAME, pk_funcs);
 640#if defined(LUA_COMPAT_LOADLIB) 
 641  lua_getfield(L, -1, "loadlib");
 642  lua_setfield(L, LUA_GLOBALSINDEX, "loadlib");
 643#endif
 644  lua_pushvalue(L, -1);
 645  lua_replace(L, LUA_ENVIRONINDEX);
 646  /* create `loaders' table */
 647  lua_createtable(L, sizeof(loaders)/sizeof(loaders[0]) - 1, 0);
 648  /* fill it with pre-defined loaders */
 649  for (i=0; loaders[i] != NULL; i++) {
 650    lua_pushcfunction(L, loaders[i]);
 651    lua_rawseti(L, -2, i+1);
 652  }
 653  lua_setfield(L, -2, "loaders");  /* put it in field `loaders' */
 654  setpath(L, "path", LUA_PATH, LUA_PATH_DEFAULT);  /* set field `path' */
 655  setpath(L, "cpath", LUA_CPATH, LUA_CPATH_DEFAULT); /* set field `cpath' */
 656  /* store config information */
 657  lua_pushliteral(L, LUA_DIRSEP "\n" LUA_PATHSEP "\n" LUA_PATH_MARK "\n"
 658                     LUA_EXECDIR "\n" LUA_IGMARK);
 659  lua_setfield(L, -2, "config");
 660  /* set field `loaded' */
 661  luaL_findtable(L, LUA_REGISTRYINDEX, "_LOADED", 2);
 662  lua_setfield(L, -2, "loaded");
 663  /* set field `preload' */
 664  lua_newtable(L);
 665  lua_setfield(L, -2, "preload");
 666  lua_pushvalue(L, LUA_GLOBALSINDEX);
 667  luaL_register(L, NULL, ll_funcs);  /* open lib into global table */
 668  lua_pop(L, 1);
 669  return 1;  /* return 'package' table */
 670}
 671
 672