source/libs/luajit/LuaJIT-src/src/lib_package.c

   1 /*
   2 ** Package library.
   3 ** Copyright (C) 2005-2015 Mike Pall. See Copyright Notice in luajit.h
   4 **
   5 ** Major portions taken verbatim or adapted from the Lua interpreter.
   6 ** Copyright (C) 1994-2012 Lua.org, PUC-Rio. See Copyright Notice in lua.h
   7 */
   8
   9 #define lib_package_c
  10 #define LUA_LIB
  11
  12 #include "lua.h"
  13 #include "lauxlib.h"
  14 #include "lualib.h"
  15
  16 #include "lj_obj.h"
  17 #include "lj_err.h"
  18 #include "lj_lib.h"
  19
  20 /* ------------------------------------------------------------------------ */
  21
  22 /* Error codes for ll_loadfunc. */
  23 #define PACKAGE_ERR_LIB         1
  24 #define PACKAGE_ERR_FUNC        2
  25 #define PACKAGE_ERR_LOAD        3
  26
  27 /* Redefined in platform specific part. */
  28 #define PACKAGE_LIB_FAIL        "open"
  29 #define setprogdir(L)           ((void)0)
  30
  31 /* Symbol name prefixes. */
  32 #define SYMPREFIX_CF            "luaopen_%s"
  33 #define SYMPREFIX_BC            "luaJIT_BC_%s"
  34
  35 #if LJ_TARGET_DLOPEN
  36
  37 #include <dlfcn.h>
  38
  39 static void ll_unloadlib(void *lib)
  40 {
  41   dlclose(lib);
  42 }
  43
  44 static void *ll_load(lua_State *L, const char *path, int gl)
  45 {
  46   void *lib = dlopen(path, RTLD_NOW | (gl ? RTLD_GLOBAL : RTLD_LOCAL));
  47   if (lib == NULL) lua_pushstring(L, dlerror());
  48   return lib;
  49 }
  50
  51 static lua_CFunction ll_sym(lua_State *L, void *lib, const char *sym)
  52 {
  53   lua_CFunction f = (lua_CFunction)dlsym(lib, sym);
  54   if (f == NULL) lua_pushstring(L, dlerror());
  55   return f;
  56 }
  57
  58 static const char *ll_bcsym(void *lib, const char *sym)
  59 {
  60 #if defined(RTLD_DEFAULT)
  61   if (lib == NULL) lib = RTLD_DEFAULT;
  62 #elif LJ_TARGET_OSX || LJ_TARGET_BSD
  63   if (lib == NULL) lib = (void *)(intptr_t)-2;
  64 #endif
  65   return (const char *)dlsym(lib, sym);
  66 }
  67
  68 #elif LJ_TARGET_WINDOWS
  69
  70 #define WIN32_LEAN_AND_MEAN
  71 #include <windows.h>
  72
  73 #ifndef GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
  74 #define GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS  4
  75 #define GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT  2
  76 BOOL WINAPI GetModuleHandleExA(DWORD, LPCSTR, HMODULE*);
  77 #endif
  78
  79 #undef setprogdir
  80
  81 static void setprogdir(lua_State *L)
  82 {
  83   char buff[MAX_PATH + 1];
  84   char *lb;
  85   DWORD nsize = sizeof(buff);
  86   DWORD n = GetModuleFileNameA(NULL, buff, nsize);
  87   if (n == 0 || n == nsize || (lb = strrchr(buff, '\\')) == NULL) {
  88     luaL_error(L, "unable to get ModuleFileName");
  89   } else {
  90     *lb = '\0';
  91     luaL_gsub(L, lua_tostring(L, -1), LUA_EXECDIR, buff);
  92     lua_remove(L, -2);  /* remove original string */
  93   }
  94 }
  95
  96 static void pusherror(lua_State *L)
  97 {
  98   DWORD error = GetLastError();
  99 #if LJ_TARGET_XBOXONE
 100   wchar_t wbuffer[128];
 101   char buffer[128*2];
 102   if (FormatMessageW(FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_FROM_SYSTEM,
 103       NULL, error, 0, wbuffer, sizeof(wbuffer)/sizeof(wchar_t), NULL) &&
 104       WideCharToMultiByte(CP_ACP, 0, wbuffer, 128, buffer, 128*2, NULL, NULL))
 105 #else
 106   char buffer[128];
 107   if (FormatMessageA(FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_FROM_SYSTEM,
 108       NULL, error, 0, buffer, sizeof(buffer), NULL))
 109 #endif
 110     lua_pushstring(L, buffer);
 111   else
 112     lua_pushfstring(L, "system error %d\n", error);
 113 }
 114
 115 static void ll_unloadlib(void *lib)
 116 {
 117   FreeLibrary((HINSTANCE)lib);
 118 }
 119
 120 static void *ll_load(lua_State *L, const char *path, int gl)
 121 {
 122   HINSTANCE lib = LoadLibraryExA(path, NULL, 0);
 123   if (lib == NULL) pusherror(L);
 124   UNUSED(gl);
 125   return lib;
 126 }
 127
 128 static lua_CFunction ll_sym(lua_State *L, void *lib, const char *sym)
 129 {
 130   lua_CFunction f = (lua_CFunction)GetProcAddress((HINSTANCE)lib, sym);
 131   if (f == NULL) pusherror(L);
 132   return f;
 133 }
 134
 135 static const char *ll_bcsym(void *lib, const char *sym)
 136 {
 137   if (lib) {
 138     return (const char *)GetProcAddress((HINSTANCE)lib, sym);
 139   } else {
 140     HINSTANCE h = GetModuleHandleA(NULL);
 141     const char *p = (const char *)GetProcAddress(h, sym);
 142     if (p == NULL && GetModuleHandleExA(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS|GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT,
 143                                         (const char *)ll_bcsym, &h))
 144       p = (const char *)GetProcAddress(h, sym);
 145     return p;
 146   }
 147 }
 148
 149 #else
 150
 151 #undef PACKAGE_LIB_FAIL
 152 #define PACKAGE_LIB_FAIL        "absent"
 153
 154 #define DLMSG   "dynamic libraries not enabled; no support for target OS"
 155
 156 static void ll_unloadlib(void *lib)
 157 {
 158   UNUSED(lib);
 159 }
 160
 161 static void *ll_load(lua_State *L, const char *path, int gl)
 162 {
 163   UNUSED(path); UNUSED(gl);
 164   lua_pushliteral(L, DLMSG);
 165   return NULL;
 166 }
 167
 168 static lua_CFunction ll_sym(lua_State *L, void *lib, const char *sym)
 169 {
 170   UNUSED(lib); UNUSED(sym);
 171   lua_pushliteral(L, DLMSG);
 172   return NULL;
 173 }
 174
 175 static const char *ll_bcsym(void *lib, const char *sym)
 176 {
 177   UNUSED(lib); UNUSED(sym);
 178   return NULL;
 179 }
 180
 181 #endif
 182
 183 /* ------------------------------------------------------------------------ */
 184
 185 static void **ll_register(lua_State *L, const char *path)
 186 {
 187   void **plib;
 188   lua_pushfstring(L, "LOADLIB: %s", path);
 189   lua_gettable(L, LUA_REGISTRYINDEX);  /* check library in registry? */
 190   if (!lua_isnil(L, -1)) {  /* is there an entry? */
 191     plib = (void **)lua_touserdata(L, -1);
 192   } else {  /* no entry yet; create one */
 193     lua_pop(L, 1);
 194     plib = (void **)lua_newuserdata(L, sizeof(void *));
 195     *plib = NULL;
 196     luaL_getmetatable(L, "_LOADLIB");
 197     lua_setmetatable(L, -2);
 198     lua_pushfstring(L, "LOADLIB: %s", path);
 199     lua_pushvalue(L, -2);
 200     lua_settable(L, LUA_REGISTRYINDEX);
 201   }
 202   return plib;
 203 }
 204
 205 static const char *mksymname(lua_State *L, const char *modname,
 206                              const char *prefix)
 207 {
 208   const char *funcname;
 209   const char *mark = strchr(modname, *LUA_IGMARK);
 210   if (mark) modname = mark + 1;
 211   funcname = luaL_gsub(L, modname, ".", "_");
 212   funcname = lua_pushfstring(L, prefix, funcname);
 213   lua_remove(L, -2);  /* remove 'gsub' result */
 214   return funcname;
 215 }
 216
 217 static int ll_loadfunc(lua_State *L, const char *path, const char *name, int r)
 218 {
 219   void **reg = ll_register(L, path);
 220   if (*reg == NULL) *reg = ll_load(L, path, (*name == '*'));
 221   if (*reg == NULL) {
 222     return PACKAGE_ERR_LIB;  /* Unable to load library. */
 223   } else if (*name == '*') {  /* Only load library into global namespace. */
 224     lua_pushboolean(L, 1);
 225     return 0;
 226   } else {
 227     const char *sym = r ? name : mksymname(L, name, SYMPREFIX_CF);
 228     lua_CFunction f = ll_sym(L, *reg, sym);
 229     if (f) {
 230       lua_pushcfunction(L, f);
 231       return 0;
 232     }
 233     if (!r) {
 234       const char *bcdata = ll_bcsym(*reg, mksymname(L, name, SYMPREFIX_BC));
 235       lua_pop(L, 1);
 236       if (bcdata) {
 237         if (luaL_loadbuffer(L, bcdata, LJ_MAX_BUF, name) != 0)
 238           return PACKAGE_ERR_LOAD;
 239         return 0;
 240       }
 241     }
 242     return PACKAGE_ERR_FUNC;  /* Unable to find function. */
 243   }
 244 }
 245
 246 static int lj_cf_package_loadlib(lua_State *L)
 247 {
 248   const char *path = luaL_checkstring(L, 1);
 249   const char *init = luaL_checkstring(L, 2);
 250   int st = ll_loadfunc(L, path, init, 1);
 251   if (st == 0) {  /* no errors? */
 252     return 1;  /* return the loaded function */
 253   } else {  /* error; error message is on stack top */
 254     lua_pushnil(L);
 255     lua_insert(L, -2);
 256     lua_pushstring(L, (st == PACKAGE_ERR_LIB) ?  PACKAGE_LIB_FAIL : "init");
 257     return 3;  /* return nil, error message, and where */
 258   }
 259 }
 260
 261 static int lj_cf_package_unloadlib(lua_State *L)
 262 {
 263   void **lib = (void **)luaL_checkudata(L, 1, "_LOADLIB");
 264   if (*lib) ll_unloadlib(*lib);
 265   *lib = NULL;  /* mark library as closed */
 266   return 0;
 267 }
 268
 269 /* ------------------------------------------------------------------------ */
 270
 271 static int readable(const char *filename)
 272 {
 273   FILE *f = fopen(filename, "r");  /* try to open file */
 274   if (f == NULL) return 0;  /* open failed */
 275   fclose(f);
 276   return 1;
 277 }
 278
 279 static const char *pushnexttemplate(lua_State *L, const char *path)
 280 {
 281   const char *l;
 282   while (*path == *LUA_PATHSEP) path++;  /* skip separators */
 283   if (*path == '\0') return NULL;  /* no more templates */
 284   l = strchr(path, *LUA_PATHSEP);  /* find next separator */
 285   if (l == NULL) l = path + strlen(path);
 286   lua_pushlstring(L, path, (size_t)(l - path));  /* template */
 287   return l;
 288 }
 289
 290 static const char *searchpath (lua_State *L, const char *name,
 291                                const char *path, const char *sep,
 292                                const char *dirsep)
 293 {
 294   luaL_Buffer msg;  /* to build error message */
 295   luaL_buffinit(L, &msg);
 296   if (*sep != '\0')  /* non-empty separator? */
 297     name = luaL_gsub(L, name, sep, dirsep);  /* replace it by 'dirsep' */
 298   while ((path = pushnexttemplate(L, path)) != NULL) {
 299     const char *filename = luaL_gsub(L, lua_tostring(L, -1),
 300                                      LUA_PATH_MARK, name);
 301     lua_remove(L, -2);  /* remove path template */
 302     if (readable(filename))  /* does file exist and is readable? */
 303       return filename;  /* return that file name */
 304     lua_pushfstring(L, "\n\tno file " LUA_QS, filename);
 305     lua_remove(L, -2);  /* remove file name */
 306     luaL_addvalue(&msg);  /* concatenate error msg. entry */
 307   }
 308   luaL_pushresult(&msg);  /* create error message */
 309   return NULL;  /* not found */
 310 }
 311
 312 static int lj_cf_package_searchpath(lua_State *L)
 313 {
 314   const char *f = searchpath(L, luaL_checkstring(L, 1),
 315                                 luaL_checkstring(L, 2),
 316                                 luaL_optstring(L, 3, "."),
 317                                 luaL_optstring(L, 4, LUA_DIRSEP));
 318   if (f != NULL) {
 319     return 1;
 320   } else {  /* error message is on top of the stack */
 321     lua_pushnil(L);
 322     lua_insert(L, -2);
 323     return 2;  /* return nil + error message */
 324   }
 325 }
 326
 327 static const char *findfile(lua_State *L, const char *name,
 328                             const char *pname)
 329 {
 330   const char *path;
 331   lua_getfield(L, LUA_ENVIRONINDEX, pname);
 332   path = lua_tostring(L, -1);
 333   if (path == NULL)
 334     luaL_error(L, LUA_QL("package.%s") " must be a string", pname);
 335   return searchpath(L, name, path, ".", LUA_DIRSEP);
 336 }
 337
 338 static void loaderror(lua_State *L, const char *filename)
 339 {
 340   luaL_error(L, "error loading module " LUA_QS " from file " LUA_QS ":\n\t%s",
 341              lua_tostring(L, 1), filename, lua_tostring(L, -1));
 342 }
 343
 344 static int lj_cf_package_loader_lua(lua_State *L)
 345 {
 346   const char *filename;
 347   const char *name = luaL_checkstring(L, 1);
 348   filename = findfile(L, name, "path");
 349   if (filename == NULL) return 1;  /* library not found in this path */
 350   if (luaL_loadfile(L, filename) != 0)
 351     loaderror(L, filename);
 352   return 1;  /* library loaded successfully */
 353 }
 354
 355 static int lj_cf_package_loader_c(lua_State *L)
 356 {
 357   const char *name = luaL_checkstring(L, 1);
 358   const char *filename = findfile(L, name, "cpath");
 359   if (filename == NULL) return 1;  /* library not found in this path */
 360   if (ll_loadfunc(L, filename, name, 0) != 0)
 361     loaderror(L, filename);
 362   return 1;  /* library loaded successfully */
 363 }
 364
 365 #define LUA_POF         "luaopen_"
 366 #define LUA_OFSEP       "_"
 367 #define POF             LUA_POF
 368
 369 static const char *mkfuncname (lua_State *L, const char *modname) {
 370   const char *funcname;
 371   const char *mark = strchr(modname, *LUA_IGMARK);
 372   if (mark) modname = mark + 1;
 373   funcname = luaL_gsub(L, modname, ".", LUA_OFSEP);
 374   funcname = lua_pushfstring(L, POF"%s", funcname);
 375   lua_remove(L, -2);  /* remove 'gsub' result */
 376   return funcname;
 377 }
 378
 379
 380 int loader_C_luatex (lua_State *L, const char *name, const char *filename) {
 381   const char *funcname;
 382   funcname = mkfuncname(L, name);
 383   if (ll_loadfunc(L, filename, funcname,0) != 0)
 384     loaderror(L, filename);
 385   return 1;  /* library loaded successfully */
 386 }
 387
 388 static int lj_cf_package_loader_croot(lua_State *L)
 389 {
 390   const char *filename;
 391   const char *name = luaL_checkstring(L, 1);
 392   const char *p = strchr(name, '.');
 393   int st;
 394   if (p == NULL) return 0;  /* is root */
 395   lua_pushlstring(L, name, (size_t)(p - name));
 396   filename = findfile(L, lua_tostring(L, -1), "cpath");
 397   if (filename == NULL) return 1;  /* root not found */
 398   if ((st = ll_loadfunc(L, filename, name, 0)) != 0) {
 399     if (st != PACKAGE_ERR_FUNC) loaderror(L, filename);  /* real error */
 400     lua_pushfstring(L, "\n\tno module " LUA_QS " in file " LUA_QS,
 401                     name, filename);
 402     return 1;  /* function not found */
 403   }
 404   return 1;
 405 }
 406
 407 int loader_Call_luatex (lua_State *L, const char *name, const char *filename) {
 408   const char *funcname;
 409   int stat;
 410   if (filename == NULL) return 1;  /* root not found */
 411   funcname = mkfuncname(L, name);
 412   if ((stat = ll_loadfunc(L, filename, funcname,0)) != 0) {
 413     if (stat != PACKAGE_ERR_FUNC) loaderror(L, filename);  /* real error */
 414     lua_pushfstring(L, "\n\tno module " LUA_QS " in file " LUA_QS,
 415                        name, filename);
 416     return 1;  /* function not found */
 417   }
 418   return 1;  /* library loaded successfully */
 419 }
 420
 421
 422 static int lj_cf_package_loader_preload(lua_State *L)
 423 {
 424   const char *name = luaL_checkstring(L, 1);
 425   lua_getfield(L, LUA_ENVIRONINDEX, "preload");
 426   if (!lua_istable(L, -1))
 427     luaL_error(L, LUA_QL("package.preload") " must be a table");
 428   lua_getfield(L, -1, name);
 429   if (lua_isnil(L, -1)) {  /* Not found? */
 430     const char *bcname = mksymname(L, name, SYMPREFIX_BC);
 431     const char *bcdata = ll_bcsym(NULL, bcname);
 432     if (bcdata == NULL || luaL_loadbuffer(L, bcdata, LJ_MAX_BUF, name) != 0)
 433       lua_pushfstring(L, "\n\tno field package.preload['%s']", name);
 434   }
 435   return 1;
 436 }
 437
 438 /* ------------------------------------------------------------------------ */
 439
 440 static const int sentinel_ = 0;
 441 #define sentinel        ((void *)&sentinel_)
 442
 443 static int lj_cf_package_require(lua_State *L)
 444 {
 445   const char *name = luaL_checkstring(L, 1);
 446   int i;
 447   lua_settop(L, 1);  /* _LOADED table will be at index 2 */
 448   lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
 449   lua_getfield(L, 2, name);
 450   if (lua_toboolean(L, -1)) {  /* is it there? */
 451     if (lua_touserdata(L, -1) == sentinel)  /* check loops */
 452       luaL_error(L, "loop or previous error loading module " LUA_QS, name);
 453     return 1;  /* package is already loaded */
 454   }
 455   /* else must load it; iterate over available loaders */
 456   lua_getfield(L, LUA_ENVIRONINDEX, "loaders");
 457   if (!lua_istable(L, -1))
 458     luaL_error(L, LUA_QL("package.loaders") " must be a table");
 459   lua_pushliteral(L, "");  /* error message accumulator */
 460   for (i = 1; ; i++) {
 461     lua_rawgeti(L, -2, i);  /* get a loader */
 462     if (lua_isnil(L, -1))
 463       luaL_error(L, "module " LUA_QS " not found:%s",
 464                  name, lua_tostring(L, -2));
 465     lua_pushstring(L, name);
 466     lua_call(L, 1, 1);  /* call it */
 467     if (lua_isfunction(L, -1))  /* did it find module? */
 468       break;  /* module loaded successfully */
 469     else if (lua_isstring(L, -1))  /* loader returned error message? */
 470       lua_concat(L, 2);  /* accumulate it */
 471     else
 472       lua_pop(L, 1);
 473   }
 474   lua_pushlightuserdata(L, sentinel);
 475   lua_setfield(L, 2, name);  /* _LOADED[name] = sentinel */
 476   lua_pushstring(L, name);  /* pass name as argument to module */
 477   lua_call(L, 1, 1);  /* run loaded module */
 478   if (!lua_isnil(L, -1))  /* non-nil return? */
 479     lua_setfield(L, 2, name);  /* _LOADED[name] = returned value */
 480   lua_getfield(L, 2, name);
 481   if (lua_touserdata(L, -1) == sentinel) {   /* module did not set a value? */
 482     lua_pushboolean(L, 1);  /* use true as result */
 483     lua_pushvalue(L, -1);  /* extra copy to be returned */
 484     lua_setfield(L, 2, name);  /* _LOADED[name] = true */
 485   }
 486   lj_lib_checkfpu(L);
 487   return 1;
 488 }
 489
 490 /* ------------------------------------------------------------------------ */
 491
 492 static void setfenv(lua_State *L)
 493 {
 494   lua_Debug ar;
 495   if (lua_getstack(L, 1, &ar) == 0 ||
 496       lua_getinfo(L, "f", &ar) == 0 ||  /* get calling function */
 497       lua_iscfunction(L, -1))
 498     luaL_error(L, LUA_QL("module") " not called from a Lua function");
 499   lua_pushvalue(L, -2);
 500   lua_setfenv(L, -2);
 501   lua_pop(L, 1);
 502 }
 503
 504 static void dooptions(lua_State *L, int n)
 505 {
 506   int i;
 507   for (i = 2; i <= n; i++) {
 508     lua_pushvalue(L, i);  /* get option (a function) */
 509     lua_pushvalue(L, -2);  /* module */
 510     lua_call(L, 1, 0);
 511   }
 512 }
 513
 514 static void modinit(lua_State *L, const char *modname)
 515 {
 516   const char *dot;
 517   lua_pushvalue(L, -1);
 518   lua_setfield(L, -2, "_M");  /* module._M = module */
 519   lua_pushstring(L, modname);
 520   lua_setfield(L, -2, "_NAME");
 521   dot = strrchr(modname, '.');  /* look for last dot in module name */
 522   if (dot == NULL) dot = modname; else dot++;
 523   /* set _PACKAGE as package name (full module name minus last part) */
 524   lua_pushlstring(L, modname, (size_t)(dot - modname));
 525   lua_setfield(L, -2, "_PACKAGE");
 526 }
 527
 528 static int lj_cf_package_module(lua_State *L)
 529 {
 530   const char *modname = luaL_checkstring(L, 1);
 531   int loaded = lua_gettop(L) + 1;  /* index of _LOADED table */
 532   lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
 533   lua_getfield(L, loaded, modname);  /* get _LOADED[modname] */
 534   if (!lua_istable(L, -1)) {  /* not found? */
 535     lua_pop(L, 1);  /* remove previous result */
 536     /* try global variable (and create one if it does not exist) */
 537     if (luaL_findtable(L, LUA_GLOBALSINDEX, modname, 1) != NULL)
 538       lj_err_callerv(L, LJ_ERR_BADMODN, modname);
 539     lua_pushvalue(L, -1);
 540     lua_setfield(L, loaded, modname);  /* _LOADED[modname] = new table */
 541   }
 542   /* check whether table already has a _NAME field */
 543   lua_getfield(L, -1, "_NAME");
 544   if (!lua_isnil(L, -1)) {  /* is table an initialized module? */
 545     lua_pop(L, 1);
 546   } else {  /* no; initialize it */
 547     lua_pop(L, 1);
 548     modinit(L, modname);
 549   }
 550   lua_pushvalue(L, -1);
 551   setfenv(L);
 552   dooptions(L, loaded - 1);
 553   return 0;
 554 }
 555
 556 static int lj_cf_package_seeall(lua_State *L)
 557 {
 558   luaL_checktype(L, 1, LUA_TTABLE);
 559   if (!lua_getmetatable(L, 1)) {
 560     lua_createtable(L, 0, 1); /* create new metatable */
 561     lua_pushvalue(L, -1);
 562     lua_setmetatable(L, 1);
 563   }
 564   lua_pushvalue(L, LUA_GLOBALSINDEX);
 565   lua_setfield(L, -2, "__index");  /* mt.__index = _G */
 566   return 0;
 567 }
 568
 569 /* ------------------------------------------------------------------------ */
 570
 571 #define AUXMARK         "\1"
 572
 573 static void setpath(lua_State *L, const char *fieldname, const char *envname,
 574                     const char *def, int noenv)
 575 {
 576 #if LJ_TARGET_CONSOLE
 577   const char *path = NULL;
 578   UNUSED(envname);
 579 #else
 580   const char *path = getenv(envname);
 581 #endif
 582   if (path == NULL || noenv) {
 583     lua_pushstring(L, def);
 584   } else {
 585     path = luaL_gsub(L, path, LUA_PATHSEP LUA_PATHSEP,
 586                               LUA_PATHSEP AUXMARK LUA_PATHSEP);
 587     luaL_gsub(L, path, AUXMARK, def);
 588     lua_remove(L, -2);
 589   }
 590   setprogdir(L);
 591   lua_setfield(L, -2, fieldname);
 592 }
 593
 594 static const luaL_Reg package_lib[] = {
 595   { "loadlib",  lj_cf_package_loadlib },
 596   { "searchpath",  lj_cf_package_searchpath },
 597   { "seeall",   lj_cf_package_seeall },
 598   { NULL, NULL }
 599 };
 600
 601 static const luaL_Reg package_global[] = {
 602   { "module",   lj_cf_package_module },
 603   { "require",  lj_cf_package_require },
 604   { NULL, NULL }
 605 };
 606
 607 static const lua_CFunction package_loaders[] =
 608 {
 609   lj_cf_package_loader_preload,
 610   lj_cf_package_loader_lua,
 611   lj_cf_package_loader_c,
 612   lj_cf_package_loader_croot,
 613   NULL
 614 };
 615
 616 LUALIB_API int luaopen_package(lua_State *L)
 617 {
 618   int i;
 619   int noenv;
 620   luaL_newmetatable(L, "_LOADLIB");
 621   lj_lib_pushcf(L, lj_cf_package_unloadlib, 1);
 622   lua_setfield(L, -2, "__gc");
 623   luaL_register(L, LUA_LOADLIBNAME, package_lib);
 624   lua_pushvalue(L, -1);
 625   lua_replace(L, LUA_ENVIRONINDEX);
 626   lua_createtable(L, sizeof(package_loaders)/sizeof(package_loaders[0])-1, 0);
 627   for (i = 0; package_loaders[i] != NULL; i++) {
 628     lj_lib_pushcf(L, package_loaders[i], 1);
 629     lua_rawseti(L, -2, i+1);
 630   }
 631   lua_setfield(L, -2, "loaders");
 632   lua_getfield(L, LUA_REGISTRYINDEX, "LUA_NOENV");
 633   noenv = lua_toboolean(L, -1);
 634   lua_pop(L, 1);
 635   setpath(L, "path", LUA_PATH, LUA_PATH_DEFAULT, noenv);
 636   setpath(L, "cpath", LUA_CPATH, LUA_CPATH_DEFAULT, noenv);
 637   lua_pushliteral(L, LUA_PATH_CONFIG);
 638   lua_setfield(L, -2, "config");
 639   luaL_findtable(L, LUA_REGISTRYINDEX, "_LOADED", 16);
 640   lua_setfield(L, -2, "loaded");
 641   luaL_findtable(L, LUA_REGISTRYINDEX, "_PRELOAD", 4);
 642   lua_setfield(L, -2, "preload");
 643   lua_pushvalue(L, LUA_GLOBALSINDEX);
 644   luaL_register(L, NULL, package_global);
 645   lua_pop(L, 1);
 646   return 1;
 647 }
 648