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src/lib_package.c - luajit-2.0-src

Global variables defined

Functions defined

Macros defined

Source code

  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. */

  9. ‌#define lib_package_c
  10. ‌#define LUA_LIB

  12. #include "lua.h"
  13. #include "lauxlib.h"
  14. #include "lualib.h"

  16. #include "lj_obj.h"
  17. #include "lj_err.h"
  18. #include "lj_lib.h"

  20. /* ------------------------------------------------------------------------ */

  22. /* Error codes for ll_loadfunc. */
  23. ‌#define PACKAGE_ERR_LIB                1
  24. ‌#define PACKAGE_ERR_FUNC        2
  25. ‌#define PACKAGE_ERR_LOAD        3

  27. /* Redefined in platform specific part. */
  28. ‌#define PACKAGE_LIB_FAIL        "open"
  29. ‌#define setprogdir(L)                ((void)0)

  31. /* Symbol name prefixes. */
  32. ‌#define SYMPREFIX_CF                "luaopen_%s"
  33. ‌#define SYMPREFIX_BC                "luaJIT_BC_%s"

  35. #if LJ_TARGET_DLOPEN

  37. #include <dlfcn.h>

  39. ‌static void ll_unloadlib(void *lib)
  40. {
  41.   dlclose(lib);
  42. }

  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. }

  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. }

  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. }

  68. #elif LJ_TARGET_WINDOWS

  70. ‌#define WIN32_LEAN_AND_MEAN
  71. #include <windows.h>

  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

  79. ‌#undef setprogdir

  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. }

  96. ‌static void pusherror(lua_State *L)
  97. {
  98.   DWORD error = GetLastError();
  99.   char buffer[128];
  100.   if (FormatMessageA(FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_FROM_SYSTEM,
  101.       NULL, error, 0, buffer, sizeof(buffer), NULL))
  102.     lua_pushstring(L, buffer);
  103.   else
  104.     lua_pushfstring(L, "system error %d\n", error);
  105. }

  107. ‌static void ll_unloadlib(void *lib)
  108. {
  109.   FreeLibrary((HINSTANCE)lib);
  110. }

  112. ‌static void *ll_load(lua_State *L, const char *path, int gl)
  113. {
  114.   HINSTANCE lib = LoadLibraryA(path);
  115.   if (lib == NULL) pusherror(L);
  116.   UNUSED(gl);
  117.   return lib;
  118. }

  120. ‌static lua_CFunction ll_sym(lua_State *L, void *lib, const char *sym)
  121. {
  122.   lua_CFunction f = (lua_CFunction)GetProcAddress((HINSTANCE)lib, sym);
  123.   if (f == NULL) pusherror(L);
  124.   return f;
  125. }

  127. ‌static const char *ll_bcsym(void *lib, const char *sym)
  128. {
  129.   if (lib) {
  130.     return (const char *)GetProcAddress((HINSTANCE)lib, sym);
  131.   } else {
  132.     HINSTANCE h = GetModuleHandleA(NULL);
  133.     const char *p = (const char *)GetProcAddress(h, sym);
  134.     if (p == NULL && GetModuleHandleExA(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS|GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT,
  135.                                         (const char *)ll_bcsym, &h))
  136.       p = (const char *)GetProcAddress(h, sym);
  137.     return p;
  138.   }
  139. }

  141. #else

  143. ‌#undef PACKAGE_LIB_FAIL
  144. ‌#define PACKAGE_LIB_FAIL        "absent"

  146. ‌#define DLMSG        "dynamic libraries not enabled; no support for target OS"

  148. ‌static void ll_unloadlib(void *lib)
  149. {
  150.   UNUSED(lib);
  151. }

  153. ‌static void *ll_load(lua_State *L, const char *path, int gl)
  154. {
  155.   UNUSED(path); UNUSED(gl);
  156.   lua_pushliteral(L, DLMSG);
  157.   return NULL;
  158. }

  160. ‌static lua_CFunction ll_sym(lua_State *L, void *lib, const char *sym)
  161. {
  162.   UNUSED(lib); UNUSED(sym);
  163.   lua_pushliteral(L, DLMSG);
  164.   return NULL;
  165. }

  167. ‌static const char *ll_bcsym(void *lib, const char *sym)
  168. {
  169.   UNUSED(lib); UNUSED(sym);
  170.   return NULL;
  171. }

  173. #endif

  175. /* ------------------------------------------------------------------------ */

  177. ‌static void **ll_register(lua_State *L, const char *path)
  178. {
  179.   void **plib;
  180.   lua_pushfstring(L, "LOADLIB: %s", path);
  181.   lua_gettable(L, LUA_REGISTRYINDEX);  /* check library in registry? */
  182.   if (!lua_isnil(L, -1)) {  /* is there an entry? */
  183.     plib = (void **)lua_touserdata(L, -1);
  184.   } else {  /* no entry yet; create one */
  185.     lua_pop(L, 1);
  186.     plib = (void **)lua_newuserdata(L, sizeof(void *));
  187.     *plib = NULL;
  188.     luaL_getmetatable(L, "_LOADLIB");
  189.     lua_setmetatable(L, -2);
  190.     lua_pushfstring(L, "LOADLIB: %s", path);
  191.     lua_pushvalue(L, -2);
  192.     lua_settable(L, LUA_REGISTRYINDEX);
  193.   }
  194.   return plib;
  195. }

  197. ‌static const char *mksymname(lua_State *L, const char *modname,
  198.                              const char *prefix)
  199. {
  200.   const char *funcname;
  201.   const char *mark = strchr(modname, *LUA_IGMARK);
  202.   if (mark) modname = mark + 1;
  203.   funcname = luaL_gsub(L, modname, ".", "_");
  204.   funcname = lua_pushfstring(L, prefix, funcname);
  205.   lua_remove(L, -2);  /* remove 'gsub' result */
  206.   return funcname;
  207. }

  209. ‌static int ll_loadfunc(lua_State *L, const char *path, const char *name, int r)
  210. {
  211.   void **reg = ll_register(L, path);
  212.   if (*reg == NULL) *reg = ll_load(L, path, (*name == '*'));
  213.   if (*reg == NULL) {
  214.     return PACKAGE_ERR_LIB;  /* Unable to load library. */
  215.   } else if (*name == '*') {  /* Only load library into global namespace. */
  216.     lua_pushboolean(L, 1);
  217.     return 0;
  218.   } else {
  219.     const char *sym = r ? name : mksymname(L, name, SYMPREFIX_CF);
  220.     lua_CFunction f = ll_sym(L, *reg, sym);
  221.     if (f) {
  222.       lua_pushcfunction(L, f);
  223.       return 0;
  224.     }
  225.     if (!r) {
  226.       const char *bcdata = ll_bcsym(*reg, mksymname(L, name, SYMPREFIX_BC));
  227.       lua_pop(L, 1);
  228.       if (bcdata) {
  229.         if (luaL_loadbuffer(L, bcdata, LJ_MAX_BUF, name) != 0)
  230.           return PACKAGE_ERR_LOAD;
  231.         return 0;
  232.       }
  233.     }
  234.     return PACKAGE_ERR_FUNC;  /* Unable to find function. */
  235.   }
  236. }

  238. ‌static int lj_cf_package_loadlib(lua_State *L)
  239. {
  240.   const char *path = luaL_checkstring(L, 1);
  241.   const char *init = luaL_checkstring(L, 2);
  242.   int st = ll_loadfunc(L, path, init, 1);
  243.   if (st == 0) {  /* no errors? */
  244.     return 1;  /* return the loaded function */
  245.   } else {  /* error; error message is on stack top */
  246.     lua_pushnil(L);
  247.     lua_insert(L, -2);
  248.     lua_pushstring(L, (st == PACKAGE_ERR_LIB) ?  PACKAGE_LIB_FAIL : "init");
  249.     return 3;  /* return nil, error message, and where */
  250.   }
  251. }

  253. ‌static int lj_cf_package_unloadlib(lua_State *L)
  254. {
  255.   void **lib = (void **)luaL_checkudata(L, 1, "_LOADLIB");
  256.   if (*lib) ll_unloadlib(*lib);
  257.   *lib = NULL;  /* mark library as closed */
  258.   return 0;
  259. }

  261. /* ------------------------------------------------------------------------ */

  263. ‌static int readable(const char *filename)
  264. {
  265.   FILE *f = fopen(filename, "r");  /* try to open file */
  266.   if (f == NULL) return 0;  /* open failed */
  267.   fclose(f);
  268.   return 1;
  269. }

  271. ‌static const char *pushnexttemplate(lua_State *L, const char *path)
  272. {
  273.   const char *l;
  274.   while (*path == *LUA_PATHSEP) path++;  /* skip separators */
  275.   if (*path == '\0') return NULL;  /* no more templates */
  276.   l = strchr(path, *LUA_PATHSEP);  /* find next separator */
  277.   if (l == NULL) l = path + strlen(path);
  278.   lua_pushlstring(L, path, (size_t)(l - path));  /* template */
  279.   return l;
  280. }

  282. ‌static const char *searchpath (lua_State *L, const char *name,
  283.                                const char *path, const char *sep,
  284.                                const char *dirsep)
  285. {
  286.   luaL_Buffer msg;  /* to build error message */
  287.   luaL_buffinit(L, &msg);
  288.   if (*sep != '\0')  /* non-empty separator? */
  289.     name = luaL_gsub(L, name, sep, dirsep);  /* replace it by 'dirsep' */
  290.   while ((path = pushnexttemplate(L, path)) != NULL) {
  291.     const char *filename = luaL_gsub(L, lua_tostring(L, -1),
  292.                                      LUA_PATH_MARK, name);
  293.     lua_remove(L, -2);  /* remove path template */
  294.     if (readable(filename))  /* does file exist and is readable? */
  295.       return filename;  /* return that file name */
  296.     lua_pushfstring(L, "\n\tno file " LUA_QS, filename);
  297.     lua_remove(L, -2);  /* remove file name */
  298.     luaL_addvalue(&msg);  /* concatenate error msg. entry */
  299.   }
  300.   luaL_pushresult(&msg);  /* create error message */
  301.   return NULL;  /* not found */
  302. }

  304. ‌static int lj_cf_package_searchpath(lua_State *L)
  305. {
  306.   const char *f = searchpath(L, luaL_checkstring(L, 1),
  307.                                 luaL_checkstring(L, 2),
  308.                                 luaL_optstring(L, 3, "."),
  309.                                 luaL_optstring(L, 4, LUA_DIRSEP));
  310.   if (f != NULL) {
  311.     return 1;
  312.   } else {  /* error message is on top of the stack */
  313.     lua_pushnil(L);
  314.     lua_insert(L, -2);
  315.     return 2;  /* return nil + error message */
  316.   }
  317. }

  319. ‌static const char *findfile(lua_State *L, const char *name,
  320.                             const char *pname)
  321. {
  322.   const char *path;
  323.   lua_getfield(L, LUA_ENVIRONINDEX, pname);
  324.   path = lua_tostring(L, -1);
  325.   if (path == NULL)
  326.     luaL_error(L, LUA_QL("package.%s") " must be a string", pname);
  327.   return searchpath(L, name, path, ".", LUA_DIRSEP);
  328. }

  330. ‌static void loaderror(lua_State *L, const char *filename)
  331. {
  332.   luaL_error(L, "error loading module " LUA_QS " from file " LUA_QS ":\n\t%s",
  333.              lua_tostring(L, 1), filename, lua_tostring(L, -1));
  334. }

  336. ‌static int lj_cf_package_loader_lua(lua_State *L)
  337. {
  338.   const char *filename;
  339.   const char *name = luaL_checkstring(L, 1);
  340.   filename = findfile(L, name, "path");
  341.   if (filename == NULL) return 1;  /* library not found in this path */
  342.   if (luaL_loadfile(L, filename) != 0)
  343.     loaderror(L, filename);
  344.   return 1;  /* library loaded successfully */
  345. }

  347. ‌static int lj_cf_package_loader_c(lua_State *L)
  348. {
  349.   const char *name = luaL_checkstring(L, 1);
  350.   const char *filename = findfile(L, name, "cpath");
  351.   if (filename == NULL) return 1;  /* library not found in this path */
  352.   if (ll_loadfunc(L, filename, name, 0) != 0)
  353.     loaderror(L, filename);
  354.   return 1;  /* library loaded successfully */
  355. }

  357. ‌static int lj_cf_package_loader_croot(lua_State *L)
  358. {
  359.   const char *filename;
  360.   const char *name = luaL_checkstring(L, 1);
  361.   const char *p = strchr(name, '.');
  362.   int st;
  363.   if (p == NULL) return 0;  /* is root */
  364.   lua_pushlstring(L, name, (size_t)(p - name));
  365.   filename = findfile(L, lua_tostring(L, -1), "cpath");
  366.   if (filename == NULL) return 1;  /* root not found */
  367.   if ((st = ll_loadfunc(L, filename, name, 0)) != 0) {
  368.     if (st != PACKAGE_ERR_FUNC) loaderror(L, filename);  /* real error */
  369.     lua_pushfstring(L, "\n\tno module " LUA_QS " in file " LUA_QS,
  370.                     name, filename);
  371.     return 1;  /* function not found */
  372.   }
  373.   return 1;
  374. }

  376. ‌static int lj_cf_package_loader_preload(lua_State *L)
  377. {
  378.   const char *name = luaL_checkstring(L, 1);
  379.   lua_getfield(L, LUA_ENVIRONINDEX, "preload");
  380.   if (!lua_istable(L, -1))
  381.     luaL_error(L, LUA_QL("package.preload") " must be a table");
  382.   lua_getfield(L, -1, name);
  383.   if (lua_isnil(L, -1)) {  /* Not found? */
  384.     const char *bcname = mksymname(L, name, SYMPREFIX_BC);
  385.     const char *bcdata = ll_bcsym(NULL, bcname);
  386.     if (bcdata == NULL || luaL_loadbuffer(L, bcdata, LJ_MAX_BUF, name) != 0)
  387.       lua_pushfstring(L, "\n\tno field package.preload['%s']", name);
  388.   }
  389.   return 1;
  390. }

  392. /* ------------------------------------------------------------------------ */

  394. ‌static const int sentinel_ = 0;
  395. ‌#define sentinel        ((void *)&sentinel_)

  397. ‌static int lj_cf_package_require(lua_State *L)
  398. {
  399.   const char *name = luaL_checkstring(L, 1);
  400.   int i;
  401.   lua_settop(L, 1);  /* _LOADED table will be at index 2 */
  402.   lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
  403.   lua_getfield(L, 2, name);
  404.   if (lua_toboolean(L, -1)) {  /* is it there? */
  405.     if (lua_touserdata(L, -1) == sentinel)  /* check loops */
  406.       luaL_error(L, "loop or previous error loading module " LUA_QS, name);
  407.     return 1;  /* package is already loaded */
  408.   }
  409.   /* else must load it; iterate over available loaders */
  410.   lua_getfield(L, LUA_ENVIRONINDEX, "loaders");
  411.   if (!lua_istable(L, -1))
  412.     luaL_error(L, LUA_QL("package.loaders") " must be a table");
  413.   lua_pushliteral(L, "");  /* error message accumulator */
  414.   for (i = 1; ; i++) {
  415.     lua_rawgeti(L, -2, i);  /* get a loader */
  416.     if (lua_isnil(L, -1))
  417.       luaL_error(L, "module " LUA_QS " not found:%s",
  418.                  name, lua_tostring(L, -2));
  419.     lua_pushstring(L, name);
  420.     lua_call(L, 1, 1);  /* call it */
  421.     if (lua_isfunction(L, -1))  /* did it find module? */
  422.       break;  /* module loaded successfully */
  423.     else if (lua_isstring(L, -1))  /* loader returned error message? */
  424.       lua_concat(L, 2);  /* accumulate it */
  425.     else
  426.       lua_pop(L, 1);
  427.   }
  428.   lua_pushlightuserdata(L, sentinel);
  429.   lua_setfield(L, 2, name);  /* _LOADED[name] = sentinel */
  430.   lua_pushstring(L, name);  /* pass name as argument to module */
  431.   lua_call(L, 1, 1);  /* run loaded module */
  432.   if (!lua_isnil(L, -1))  /* non-nil return? */
  433.     lua_setfield(L, 2, name);  /* _LOADED[name] = returned value */
  434.   lua_getfield(L, 2, name);
  435.   if (lua_touserdata(L, -1) == sentinel) {   /* module did not set a value? */
  436.     lua_pushboolean(L, 1);  /* use true as result */
  437.     lua_pushvalue(L, -1);  /* extra copy to be returned */
  438.     lua_setfield(L, 2, name);  /* _LOADED[name] = true */
  439.   }
  440.   lj_lib_checkfpu(L);
  441.   return 1;
  442. }

  444. /* ------------------------------------------------------------------------ */

  446. ‌static void setfenv(lua_State *L)
  447. {
  448.   lua_Debug ar;
  449.   if (lua_getstack(L, 1, &ar) == 0 ||
  450.       lua_getinfo(L, "f", &ar) == 0 ||  /* get calling function */
  451.       lua_iscfunction(L, -1))
  452.     luaL_error(L, LUA_QL("module") " not called from a Lua function");
  453.   lua_pushvalue(L, -2);
  454.   lua_setfenv(L, -2);
  455.   lua_pop(L, 1);
  456. }

  458. ‌static void dooptions(lua_State *L, int n)
  459. {
  460.   int i;
  461.   for (i = 2; i <= n; i++) {
  462.     lua_pushvalue(L, i);  /* get option (a function) */
  463.     lua_pushvalue(L, -2);  /* module */
  464.     lua_call(L, 1, 0);
  465.   }
  466. }

  468. ‌static void modinit(lua_State *L, const char *modname)
  469. {
  470.   const char *dot;
  471.   lua_pushvalue(L, -1);
  472.   lua_setfield(L, -2, "_M");  /* module._M = module */
  473.   lua_pushstring(L, modname);
  474.   lua_setfield(L, -2, "_NAME");
  475.   dot = strrchr(modname, '.');  /* look for last dot in module name */
  476.   if (dot == NULL) dot = modname; else dot++;
  477.   /* set _PACKAGE as package name (full module name minus last part) */
  478.   lua_pushlstring(L, modname, (size_t)(dot - modname));
  479.   lua_setfield(L, -2, "_PACKAGE");
  480. }

  482. ‌static int lj_cf_package_module(lua_State *L)
  483. {
  484.   const char *modname = luaL_checkstring(L, 1);
  485.   int loaded = lua_gettop(L) + 1;  /* index of _LOADED table */
  486.   lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
  487.   lua_getfield(L, loaded, modname);  /* get _LOADED[modname] */
  488.   if (!lua_istable(L, -1)) {  /* not found? */
  489.     lua_pop(L, 1);  /* remove previous result */
  490.     /* try global variable (and create one if it does not exist) */
  491.     if (luaL_findtable(L, LUA_GLOBALSINDEX, modname, 1) != NULL)
  492.       lj_err_callerv(L, LJ_ERR_BADMODN, modname);
  493.     lua_pushvalue(L, -1);
  494.     lua_setfield(L, loaded, modname);  /* _LOADED[modname] = new table */
  495.   }
  496.   /* check whether table already has a _NAME field */
  497.   lua_getfield(L, -1, "_NAME");
  498.   if (!lua_isnil(L, -1)) {  /* is table an initialized module? */
  499.     lua_pop(L, 1);
  500.   } else {  /* no; initialize it */
  501.     lua_pop(L, 1);
  502.     modinit(L, modname);
  503.   }
  504.   lua_pushvalue(L, -1);
  505.   setfenv(L);
  506.   dooptions(L, loaded - 1);
  507.   return 0;
  508. }

  510. ‌static int lj_cf_package_seeall(lua_State *L)
  511. {
  512.   luaL_checktype(L, 1, LUA_TTABLE);
  513.   if (!lua_getmetatable(L, 1)) {
  514.     lua_createtable(L, 0, 1); /* create new metatable */
  515.     lua_pushvalue(L, -1);
  516.     lua_setmetatable(L, 1);
  517.   }
  518.   lua_pushvalue(L, LUA_GLOBALSINDEX);
  519.   lua_setfield(L, -2, "__index");  /* mt.__index = _G */
  520.   return 0;
  521. }

  523. /* ------------------------------------------------------------------------ */

  525. ‌#define AUXMARK                "\1"

  527. ‌static void setpath(lua_State *L, const char *fieldname, const char *envname,
  528.                     const char *def, int noenv)
  529. {
  530. #if LJ_TARGET_CONSOLE
  531.   const char *path = NULL;
  532.   UNUSED(envname);
  533. #else
  534.   const char *path = getenv(envname);
  535. #endif
  536.   if (path == NULL || noenv) {
  537.     lua_pushstring(L, def);
  538.   } else {
  539.     path = luaL_gsub(L, path, LUA_PATHSEP LUA_PATHSEP,
  540.                               LUA_PATHSEP AUXMARK LUA_PATHSEP);
  541.     luaL_gsub(L, path, AUXMARK, def);
  542.     lua_remove(L, -2);
  543.   }
  544.   setprogdir(L);
  545.   lua_setfield(L, -2, fieldname);
  546. }

  548. ‌static const luaL_Reg package_lib[] = {
  549.   { "loadlib",        lj_cf_package_loadlib },
  550.   { "searchpath",  lj_cf_package_searchpath },
  551.   { "seeall",        lj_cf_package_seeall },
  552.   { NULL, NULL }
  553. };

  555. ‌static const luaL_Reg package_global[] = {
  556.   { "module",        lj_cf_package_module },
  557.   { "require",        lj_cf_package_require },
  558.   { NULL, NULL }
  559. };

  561. ‌static const lua_CFunction package_loaders[] =
  562. {
  563.   lj_cf_package_loader_preload,
  564.   lj_cf_package_loader_lua,
  565.   lj_cf_package_loader_c,
  566.   lj_cf_package_loader_croot,
  567.   NULL
  568. };

  570. ‌LUALIB_API int luaopen_package(lua_State *L)
  571. {
  572.   int i;
  573.   int noenv;
  574.   luaL_newmetatable(L, "_LOADLIB");
  575.   lj_lib_pushcf(L, lj_cf_package_unloadlib, 1);
  576.   lua_setfield(L, -2, "__gc");
  577.   luaL_register(L, LUA_LOADLIBNAME, package_lib);
  578.   lua_pushvalue(L, -1);
  579.   lua_replace(L, LUA_ENVIRONINDEX);
  580.   lua_createtable(L, sizeof(package_loaders)/sizeof(package_loaders[0])-1, 0);
  581.   for (i = 0; package_loaders[i] != NULL; i++) {
  582.     lj_lib_pushcf(L, package_loaders[i], 1);
  583.     lua_rawseti(L, -2, i+1);
  584.   }
  585.   lua_setfield(L, -2, "loaders");
  586.   lua_getfield(L, LUA_REGISTRYINDEX, "LUA_NOENV");
  587.   noenv = lua_toboolean(L, -1);
  588.   lua_pop(L, 1);
  589.   setpath(L, "path", LUA_PATH, LUA_PATH_DEFAULT, noenv);
  590.   setpath(L, "cpath", LUA_CPATH, LUA_CPATH_DEFAULT, noenv);
  591.   lua_pushliteral(L, LUA_PATH_CONFIG);
  592.   lua_setfield(L, -2, "config");
  593.   luaL_findtable(L, LUA_REGISTRYINDEX, "_LOADED", 16);
  594.   lua_setfield(L, -2, "loaded");
  595.   luaL_findtable(L, LUA_REGISTRYINDEX, "_PRELOAD", 4);
  596.   lua_setfield(L, -2, "preload");
  597.   lua_pushvalue(L, LUA_GLOBALSINDEX);
  598.   luaL_register(L, NULL, package_global);
  599.   lua_pop(L, 1);
  600.   return 1;
  601. }

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