1/* 2** $Id: loadlib.c,v 1.111 2012/05/30 12:33:44 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 Windows, and a stub for other 8** systems. 9*/ 10 11 12/* 13** if needed, includes windows header before everything else 14*/ 15#if defined(_WIN32) 16#include <windows.h> 17#endif 18 19 20#include <stdlib.h> 21#include <string.h> 22 23 24#define loadlib_c 25#define LUA_LIB 26 27#include "lua.h" 28 29#include "lauxlib.h" 30#include "lualib.h" 31 32 33/* 34** LUA_PATH and LUA_CPATH are the names of the environment 35** variables that Lua check to set its paths. 36*/ 37#if !defined(LUA_PATH) 38#define LUA_PATH "LUA_PATH" 39#endif 40 41#if !defined(LUA_CPATH) 42#define LUA_CPATH "LUA_CPATH" 43#endif 44 45#define LUA_PATHSUFFIX "_" LUA_VERSION_MAJOR "_" LUA_VERSION_MINOR 46 47#define LUA_PATHVERSION LUA_PATH LUA_PATHSUFFIX 48#define LUA_CPATHVERSION LUA_CPATH LUA_PATHSUFFIX 49 50/* 51** LUA_PATH_SEP is the character that separates templates in a path. 52** LUA_PATH_MARK is the string that marks the substitution points in a 53** template. 54** LUA_EXEC_DIR in a Windows path is replaced by the executable's 55** directory. 56** LUA_IGMARK is a mark to ignore all before it when building the 57** luaopen_ function name. 58*/ 59#if !defined (LUA_PATH_SEP) 60#define LUA_PATH_SEP ";" 61#endif 62#if !defined (LUA_PATH_MARK) 63#define LUA_PATH_MARK "?" 64#endif 65#if !defined (LUA_EXEC_DIR) 66#define LUA_EXEC_DIR "!" 67#endif 68#if !defined (LUA_IGMARK) 69#define LUA_IGMARK "-" 70#endif 71 72 73/* 74** LUA_CSUBSEP is the character that replaces dots in submodule names 75** when searching for a C loader. 76** LUA_LSUBSEP is the character that replaces dots in submodule names 77** when searching for a Lua loader. 78*/ 79#if !defined(LUA_CSUBSEP) 80#define LUA_CSUBSEP LUA_DIRSEP 81#endif 82 83#if !defined(LUA_LSUBSEP) 84#define LUA_LSUBSEP LUA_DIRSEP 85#endif 86 87 88/* prefix for open functions in C libraries */ 89#define LUA_POF "luaopen_" 90 91/* separator for open functions in C libraries */ 92#define LUA_OFSEP "_" 93 94 95/* table (in the registry) that keeps handles for all loaded C libraries */ 96#define CLIBS "_CLIBS" 97 98#define LIB_FAIL "open" 99 100 101/* error codes for ll_loadfunc */ 102#define ERRLIB 1 103#define ERRFUNC 2 104 105#define setprogdir(L) ((void)0) 106 107 108/* 109** system-dependent functions 110*/ 111static void ll_unloadlib (void *lib); 112static void *ll_load (lua_State *L, const char *path, int seeglb); 113static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym); 114 115 116 117#if defined(LUA_USE_DLOPEN) 118/* 119** {======================================================================== 120** This is an implementation of loadlib based on the dlfcn interface. 121** The dlfcn interface is available in Linux, SunOS, Solaris, IRIX, FreeBSD, 122** NetBSD, AIX 4.2, HPUX 11, and probably most other Unix flavors, at least 123** as an emulation layer on top of native functions. 124** ========================================================================= 125*/ 126 127#include <dlfcn.h> 128 129static void ll_unloadlib (void *lib) { 130 dlclose(lib); 131} 132 133 134static void *ll_load (lua_State *L, const char *path, int seeglb) { 135 void *lib = dlopen(path, RTLD_NOW | (seeglb ? RTLD_GLOBAL : RTLD_LOCAL)); 136 if (lib == NULL) lua_pushstring(L, dlerror()); 137 return lib; 138} 139 140 141static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) { 142 lua_CFunction f = (lua_CFunction)dlsym(lib, sym); 143 if (f == NULL) lua_pushstring(L, dlerror()); 144 return f; 145} 146 147/* }====================================================== */ 148 149 150 151#elif defined(LUA_DL_DLL) 152/* 153** {====================================================================== 154** This is an implementation of loadlib for Windows using native functions. 155** ======================================================================= 156*/ 157 158#undef setprogdir 159 160/* 161** optional flags for LoadLibraryEx 162*/ 163#if !defined(LUA_LLE_FLAGS) 164#define LUA_LLE_FLAGS 0 165#endif 166 167 168static void setprogdir (lua_State *L) { 169 char buff[MAX_PATH + 1]; 170 char *lb; 171 DWORD nsize = sizeof(buff)/sizeof(char); 172 DWORD n = GetModuleFileNameA(NULL, buff, nsize); 173 if (n == 0 || n == nsize || (lb = strrchr(buff, '\\')) == NULL) 174 luaL_error(L, "unable to get ModuleFileName"); 175 else { 176 *lb = '\0'; 177 luaL_gsub(L, lua_tostring(L, -1), LUA_EXEC_DIR, buff); 178 lua_remove(L, -2); /* remove original string */ 179 } 180} 181 182 183static void pusherror (lua_State *L) { 184 int error = GetLastError(); 185 char buffer[128]; 186 if (FormatMessageA(FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_FROM_SYSTEM, 187 NULL, error, 0, buffer, sizeof(buffer)/sizeof(char), NULL)) 188 lua_pushstring(L, buffer); 189 else 190 lua_pushfstring(L, "system error %d\n", error); 191} 192 193static void ll_unloadlib (void *lib) { 194 FreeLibrary((HMODULE)lib); 195} 196 197 198static void *ll_load (lua_State *L, const char *path, int seeglb) { 199 HMODULE lib = LoadLibraryExA(path, NULL, LUA_LLE_FLAGS); 200 (void)(seeglb); /* not used: symbols are 'global' by default */ 201 if (lib == NULL) pusherror(L); 202 return lib; 203} 204 205 206static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) { 207 lua_CFunction f = (lua_CFunction)GetProcAddress((HMODULE)lib, sym); 208 if (f == NULL) pusherror(L); 209 return f; 210} 211 212/* }====================================================== */ 213 214 215#else 216/* 217** {====================================================== 218** Fallback for other systems 219** ======================================================= 220*/ 221 222#undef LIB_FAIL 223#define LIB_FAIL "absent" 224 225 226#define DLMSG "dynamic libraries not enabled; check your Lua installation" 227 228 229static void ll_unloadlib (void *lib) { 230 (void)(lib); /* not used */ 231} 232 233 234static void *ll_load (lua_State *L, const char *path, int seeglb) { 235 (void)(path); (void)(seeglb); /* not used */ 236 lua_pushliteral(L, DLMSG); 237 return NULL; 238} 239 240 241static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) { 242 (void)(lib); (void)(sym); /* not used */ 243 lua_pushliteral(L, DLMSG); 244 return NULL; 245} 246 247/* }====================================================== */ 248#endif 249 250 251static void *ll_checkclib (lua_State *L, const char *path) { 252 void *plib; 253 lua_getfield(L, LUA_REGISTRYINDEX, CLIBS); 254 lua_getfield(L, -1, path); 255 plib = lua_touserdata(L, -1); /* plib = CLIBS[path] */ 256 lua_pop(L, 2); /* pop CLIBS table and 'plib' */ 257 return plib; 258} 259 260 261static void ll_addtoclib (lua_State *L, const char *path, void *plib) { 262 lua_getfield(L, LUA_REGISTRYINDEX, CLIBS); 263 lua_pushlightuserdata(L, plib); 264 lua_pushvalue(L, -1); 265 lua_setfield(L, -3, path); /* CLIBS[path] = plib */ 266 lua_rawseti(L, -2, luaL_len(L, -2) + 1); /* CLIBS[#CLIBS + 1] = plib */ 267 lua_pop(L, 1); /* pop CLIBS table */ 268} 269 270 271/* 272** __gc tag method for CLIBS table: calls 'll_unloadlib' for all lib 273** handles in list CLIBS 274*/ 275static int gctm (lua_State *L) { 276 int n = luaL_len(L, 1); 277 for (; n >= 1; n--) { /* for each handle, in reverse order */ 278 lua_rawgeti(L, 1, n); /* get handle CLIBS[n] */ 279 ll_unloadlib(lua_touserdata(L, -1)); 280 lua_pop(L, 1); /* pop handle */ 281 } 282 return 0; 283} 284 285 286static int ll_loadfunc (lua_State *L, const char *path, const char *sym) { 287 void *reg = ll_checkclib(L, path); /* check loaded C libraries */ 288 if (reg == NULL) { /* must load library? */ 289 reg = ll_load(L, path, *sym == '*'); 290 if (reg == NULL) return ERRLIB; /* unable to load library */ 291 ll_addtoclib(L, path, reg); 292 } 293 if (*sym == '*') { /* loading only library (no function)? */ 294 lua_pushboolean(L, 1); /* return 'true' */ 295 return 0; /* no errors */ 296 } 297 else { 298 lua_CFunction f = ll_sym(L, reg, sym); 299 if (f == NULL) 300 return ERRFUNC; /* unable to find function */ 301 lua_pushcfunction(L, f); /* else create new function */ 302 return 0; /* no errors */ 303 } 304} 305 306 307static int ll_loadlib (lua_State *L) { 308 const char *path = luaL_checkstring(L, 1); 309 const char *init = luaL_checkstring(L, 2); 310 int stat = ll_loadfunc(L, path, init); 311 if (stat == 0) /* no errors? */ 312 return 1; /* return the loaded function */ 313 else { /* error; error message is on stack top */ 314 lua_pushnil(L); 315 lua_insert(L, -2); 316 lua_pushstring(L, (stat == ERRLIB) ? LIB_FAIL : "init"); 317 return 3; /* return nil, error message, and where */ 318 } 319} 320 321 322 323/* 324** {====================================================== 325** 'require' function 326** ======================================================= 327*/ 328 329 330static int readable (const char *filename) { 331 FILE *f = fopen(filename, "r"); /* try to open file */ 332 if (f == NULL) return 0; /* open failed */ 333 fclose(f); 334 return 1; 335} 336 337 338static const char *pushnexttemplate (lua_State *L, const char *path) { 339 const char *l; 340 while (*path == *LUA_PATH_SEP) path++; /* skip separators */ 341 if (*path == '\0') return NULL; /* no more templates */ 342 l = strchr(path, *LUA_PATH_SEP); /* find next separator */ 343 if (l == NULL) l = path + strlen(path); 344 lua_pushlstring(L, path, l - path); /* template */ 345 return l; 346} 347 348 349static const char *searchpath (lua_State *L, const char *name, 350 const char *path, 351 const char *sep, 352 const char *dirsep) { 353 luaL_Buffer msg; /* to build error message */ 354 luaL_buffinit(L, &msg); 355 if (*sep != '\0') /* non-empty separator? */ 356 name = luaL_gsub(L, name, sep, dirsep); /* replace it by 'dirsep' */ 357 while ((path = pushnexttemplate(L, path)) != NULL) { 358 const char *filename = luaL_gsub(L, lua_tostring(L, -1), 359 LUA_PATH_MARK, name); 360 lua_remove(L, -2); /* remove path template */ 361 if (readable(filename)) /* does file exist and is readable? */ 362 return filename; /* return that file name */ 363 lua_pushfstring(L, "\n\tno file " LUA_QS, filename); 364 lua_remove(L, -2); /* remove file name */ 365 luaL_addvalue(&msg); /* concatenate error msg. entry */ 366 } 367 luaL_pushresult(&msg); /* create error message */ 368 return NULL; /* not found */ 369} 370 371 372static int ll_searchpath (lua_State *L) { 373 const char *f = searchpath(L, luaL_checkstring(L, 1), 374 luaL_checkstring(L, 2), 375 luaL_optstring(L, 3, "."), 376 luaL_optstring(L, 4, LUA_DIRSEP)); 377 if (f != NULL) return 1; 378 else { /* error message is on top of the stack */ 379 lua_pushnil(L); 380 lua_insert(L, -2); 381 return 2; /* return nil + error message */ 382 } 383} 384 385 386static const char *findfile (lua_State *L, const char *name, 387 const char *pname, 388 const char *dirsep) { 389 const char *path; 390 lua_getfield(L, lua_upvalueindex(1), pname); 391 path = lua_tostring(L, -1); 392 if (path == NULL) 393 luaL_error(L, LUA_QL("package.%s") " must be a string", pname); 394 return searchpath(L, name, path, ".", dirsep); 395} 396 397 398static int checkload (lua_State *L, int stat, const char *filename) { 399 if (stat) { /* module loaded successfully? */ 400 lua_pushstring(L, filename); /* will be 2nd argument to module */ 401 return 2; /* return open function and file name */ 402 } 403 else 404 return luaL_error(L, "error loading module " LUA_QS 405 " from file " LUA_QS ":\n\t%s", 406 lua_tostring(L, 1), filename, lua_tostring(L, -1)); 407} 408 409 410static int searcher_Lua (lua_State *L) { 411 const char *filename; 412 const char *name = luaL_checkstring(L, 1); 413 filename = findfile(L, name, "path", LUA_LSUBSEP); 414 if (filename == NULL) return 1; /* module not found in this path */ 415 return checkload(L, (luaL_loadfile(L, filename) == LUA_OK), filename); 416} 417 418 419static int loadfunc (lua_State *L, const char *filename, const char *modname) { 420 const char *funcname; 421 const char *mark; 422 modname = luaL_gsub(L, modname, ".", LUA_OFSEP); 423 mark = strchr(modname, *LUA_IGMARK); 424 if (mark) { 425 int stat; 426 funcname = lua_pushlstring(L, modname, mark - modname); 427 funcname = lua_pushfstring(L, LUA_POF"%s", funcname); 428 stat = ll_loadfunc(L, filename, funcname); 429 if (stat != ERRFUNC) return stat; 430 modname = mark + 1; /* else go ahead and try old-style name */ 431 } 432 funcname = lua_pushfstring(L, LUA_POF"%s", modname); 433 return ll_loadfunc(L, filename, funcname); 434} 435 436 437static int searcher_C (lua_State *L) { 438 const char *name = luaL_checkstring(L, 1); 439 const char *filename = findfile(L, name, "cpath", LUA_CSUBSEP); 440 if (filename == NULL) return 1; /* module not found in this path */ 441 return checkload(L, (loadfunc(L, filename, name) == 0), filename); 442} 443 444 445static int searcher_Croot (lua_State *L) { 446 const char *filename; 447 const char *name = luaL_checkstring(L, 1); 448 const char *p = strchr(name, '.'); 449 int stat; 450 if (p == NULL) return 0; /* is root */ 451 lua_pushlstring(L, name, p - name); 452 filename = findfile(L, lua_tostring(L, -1), "cpath", LUA_CSUBSEP); 453 if (filename == NULL) return 1; /* root not found */ 454 if ((stat = loadfunc(L, filename, name)) != 0) { 455 if (stat != ERRFUNC) 456 return checkload(L, 0, filename); /* real error */ 457 else { /* open function not found */ 458 lua_pushfstring(L, "\n\tno module " LUA_QS " in file " LUA_QS, 459 name, filename); 460 return 1; 461 } 462 } 463 lua_pushstring(L, filename); /* will be 2nd argument to module */ 464 return 2; 465} 466 467 468static int searcher_preload (lua_State *L) { 469 const char *name = luaL_checkstring(L, 1); 470 lua_getfield(L, LUA_REGISTRYINDEX, "_PRELOAD"); 471 lua_getfield(L, -1, name); 472 if (lua_isnil(L, -1)) /* not found? */ 473 lua_pushfstring(L, "\n\tno field package.preload['%s']", name); 474 return 1; 475} 476 477 478static void findloader (lua_State *L, const char *name) { 479 int i; 480 luaL_Buffer msg; /* to build error message */ 481 luaL_buffinit(L, &msg); 482 lua_getfield(L, lua_upvalueindex(1), "searchers"); /* will be at index 3 */ 483 if (!lua_istable(L, 3)) 484 luaL_error(L, LUA_QL("package.searchers") " must be a table"); 485 /* iterate over available searchers to find a loader */ 486 for (i = 1; ; i++) { 487 lua_rawgeti(L, 3, i); /* get a searcher */ 488 if (lua_isnil(L, -1)) { /* no more searchers? */ 489 lua_pop(L, 1); /* remove nil */ 490 luaL_pushresult(&msg); /* create error message */ 491 luaL_error(L, "module " LUA_QS " not found:%s", 492 name, lua_tostring(L, -1)); 493 } 494 lua_pushstring(L, name); 495 lua_call(L, 1, 2); /* call it */ 496 if (lua_isfunction(L, -2)) /* did it find a loader? */ 497 return; /* module loader found */ 498 else if (lua_isstring(L, -2)) { /* searcher returned error message? */ 499 lua_pop(L, 1); /* remove extra return */ 500 luaL_addvalue(&msg); /* concatenate error message */ 501 } 502 else 503 lua_pop(L, 2); /* remove both returns */ 504 } 505} 506 507 508static int ll_require (lua_State *L) { 509 const char *name = luaL_checkstring(L, 1); 510 lua_settop(L, 1); /* _LOADED table will be at index 2 */ 511 lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED"); 512 lua_getfield(L, 2, name); /* _LOADED[name] */ 513 if (lua_toboolean(L, -1)) /* is it there? */ 514 return 1; /* package is already loaded */ 515 /* else must load package */ 516 lua_pop(L, 1); /* remove 'getfield' result */ 517 findloader(L, name); 518 lua_pushstring(L, name); /* pass name as argument to module loader */ 519 lua_insert(L, -2); /* name is 1st argument (before search data) */ 520 lua_call(L, 2, 1); /* run loader to load module */ 521 if (!lua_isnil(L, -1)) /* non-nil return? */ 522 lua_setfield(L, 2, name); /* _LOADED[name] = returned value */ 523 lua_getfield(L, 2, name); 524 if (lua_isnil(L, -1)) { /* module did not set a value? */ 525 lua_pushboolean(L, 1); /* use true as result */ 526 lua_pushvalue(L, -1); /* extra copy to be returned */ 527 lua_setfield(L, 2, name); /* _LOADED[name] = true */ 528 } 529 return 1; 530} 531 532/* }====================================================== */ 533 534 535 536/* 537** {====================================================== 538** 'module' function 539** ======================================================= 540*/ 541#if defined(LUA_COMPAT_MODULE) 542 543/* 544** changes the environment variable of calling function 545*/ 546static void set_env (lua_State *L) { 547 lua_Debug ar; 548 if (lua_getstack(L, 1, &ar) == 0 || 549 lua_getinfo(L, "f", &ar) == 0 || /* get calling function */ 550 lua_iscfunction(L, -1)) 551 luaL_error(L, LUA_QL("module") " not called from a Lua function"); 552 lua_pushvalue(L, -2); /* copy new environment table to top */ 553 lua_setupvalue(L, -2, 1); 554 lua_pop(L, 1); /* remove function */ 555} 556 557 558static void dooptions (lua_State *L, int n) { 559 int i; 560 for (i = 2; i <= n; i++) { 561 if (lua_isfunction(L, i)) { /* avoid 'calling' extra info. */ 562 lua_pushvalue(L, i); /* get option (a function) */ 563 lua_pushvalue(L, -2); /* module */ 564 lua_call(L, 1, 0); 565 } 566 } 567} 568 569 570static void modinit (lua_State *L, const char *modname) { 571 const char *dot; 572 lua_pushvalue(L, -1); 573 lua_setfield(L, -2, "_M"); /* module._M = module */ 574 lua_pushstring(L, modname); 575 lua_setfield(L, -2, "_NAME"); 576 dot = strrchr(modname, '.'); /* look for last dot in module name */ 577 if (dot == NULL) dot = modname; 578 else dot++; 579 /* set _PACKAGE as package name (full module name minus last part) */ 580 lua_pushlstring(L, modname, dot - modname); 581 lua_setfield(L, -2, "_PACKAGE"); 582} 583 584 585static int ll_module (lua_State *L) { 586 const char *modname = luaL_checkstring(L, 1); 587 int lastarg = lua_gettop(L); /* last parameter */ 588 luaL_pushmodule(L, modname, 1); /* get/create module table */ 589 /* check whether table already has a _NAME field */ 590 lua_getfield(L, -1, "_NAME"); 591 if (!lua_isnil(L, -1)) /* is table an initialized module? */ 592 lua_pop(L, 1); 593 else { /* no; initialize it */ 594 lua_pop(L, 1); 595 modinit(L, modname); 596 } 597 lua_pushvalue(L, -1); 598 set_env(L); 599 dooptions(L, lastarg); 600 return 1; 601} 602 603 604static int ll_seeall (lua_State *L) { 605 luaL_checktype(L, 1, LUA_TTABLE); 606 if (!lua_getmetatable(L, 1)) { 607 lua_createtable(L, 0, 1); /* create new metatable */ 608 lua_pushvalue(L, -1); 609 lua_setmetatable(L, 1); 610 } 611 lua_pushglobaltable(L); 612 lua_setfield(L, -2, "__index"); /* mt.__index = _G */ 613 return 0; 614} 615 616#endif 617/* }====================================================== */ 618 619 620 621/* auxiliary mark (for internal use) */ 622#define AUXMARK "\1" 623 624 625/* 626** return registry.LUA_NOENV as a boolean 627*/ 628static int noenv (lua_State *L) { 629 int b; 630 lua_getfield(L, LUA_REGISTRYINDEX, "LUA_NOENV"); 631 b = lua_toboolean(L, -1); 632 lua_pop(L, 1); /* remove value */ 633 return b; 634} 635 636 637static void setpath (lua_State *L, const char *fieldname, const char *envname1, 638 const char *envname2, const char *def) { 639 const char *path = getenv(envname1); 640 if (path == NULL) /* no environment variable? */ 641 path = getenv(envname2); /* try alternative name */ 642 if (path == NULL || noenv(L)) /* no environment variable? */ 643 lua_pushstring(L, def); /* use default */ 644 else { 645 /* replace ";;" by ";AUXMARK;" and then AUXMARK by default path */ 646 path = luaL_gsub(L, path, LUA_PATH_SEP LUA_PATH_SEP, 647 LUA_PATH_SEP AUXMARK LUA_PATH_SEP); 648 luaL_gsub(L, path, AUXMARK, def); 649 lua_remove(L, -2); 650 } 651 setprogdir(L); 652 lua_setfield(L, -2, fieldname); 653} 654 655 656static const luaL_Reg pk_funcs[] = { 657 {"loadlib", ll_loadlib}, 658 {"searchpath", ll_searchpath}, 659#if defined(LUA_COMPAT_MODULE) 660 {"seeall", ll_seeall}, 661#endif 662 {NULL, NULL} 663}; 664 665 666static const luaL_Reg ll_funcs[] = { 667#if defined(LUA_COMPAT_MODULE) 668 {"module", ll_module}, 669#endif 670 {"require", ll_require}, 671 {NULL, NULL} 672}; 673 674 675static void createsearcherstable (lua_State *L) { 676 static const lua_CFunction searchers[] = 677 {searcher_preload, searcher_Lua, searcher_C, searcher_Croot, NULL}; 678 int i; 679 /* create 'searchers' table */ 680 lua_createtable(L, sizeof(searchers)/sizeof(searchers[0]) - 1, 0); 681 /* fill it with pre-defined searchers */ 682 for (i=0; searchers[i] != NULL; i++) { 683 lua_pushvalue(L, -2); /* set 'package' as upvalue for all searchers */ 684 lua_pushcclosure(L, searchers[i], 1); 685 lua_rawseti(L, -2, i+1); 686 } 687} 688 689 690LUAMOD_API int luaopen_package (lua_State *L) { 691 /* create table CLIBS to keep track of loaded C libraries */ 692 luaL_getsubtable(L, LUA_REGISTRYINDEX, CLIBS); 693 lua_createtable(L, 0, 1); /* metatable for CLIBS */ 694 lua_pushcfunction(L, gctm); 695 lua_setfield(L, -2, "__gc"); /* set finalizer for CLIBS table */ 696 lua_setmetatable(L, -2); 697 /* create `package' table */ 698 luaL_newlib(L, pk_funcs); 699 createsearcherstable(L); 700#if defined(LUA_COMPAT_LOADERS) 701 lua_pushvalue(L, -1); /* make a copy of 'searchers' table */ 702 lua_setfield(L, -3, "loaders"); /* put it in field `loaders' */ 703#endif 704 lua_setfield(L, -2, "searchers"); /* put it in field 'searchers' */ 705 /* set field 'path' */ 706 setpath(L, "path", LUA_PATHVERSION, LUA_PATH, LUA_PATH_DEFAULT); 707 /* set field 'cpath' */ 708 setpath(L, "cpath", LUA_CPATHVERSION, LUA_CPATH, LUA_CPATH_DEFAULT); 709 /* store config information */ 710 lua_pushliteral(L, LUA_DIRSEP "\n" LUA_PATH_SEP "\n" LUA_PATH_MARK "\n" 711 LUA_EXEC_DIR "\n" LUA_IGMARK "\n"); 712 lua_setfield(L, -2, "config"); 713 /* set field `loaded' */ 714 luaL_getsubtable(L, LUA_REGISTRYINDEX, "_LOADED"); 715 lua_setfield(L, -2, "loaded"); 716 /* set field `preload' */ 717 luaL_getsubtable(L, LUA_REGISTRYINDEX, "_PRELOAD"); 718 lua_setfield(L, -2, "preload"); 719 lua_pushglobaltable(L); 720 lua_pushvalue(L, -2); /* set 'package' as upvalue for next lib */ 721 luaL_setfuncs(L, ll_funcs, 1); /* open lib into global table */ 722 lua_pop(L, 1); /* pop global table */ 723 return 1; /* return 'package' table */ 724} 725 726