Lua 5.1.4: loadlib.c

L0001    /*
L0002    ** $Id: loadlib.c,v 1.52.1.3 2008/08/06 13:29:28 roberto Exp $
L0003    ** Dynamic library loader for Lua
L0004    ** See Copyright Notice in lua.h
L0005    **
L0006    ** This module contains an implementation of loadlib for Unix systems
L0007    ** that have dlfcn, an implementation for Darwin (Mac OS X), an
L0008    ** implementation for Windows, and a stub for other systems.
L0009    */
L0010    
L0011    
L0012    #include <stdlib.h>
L0013    #include <string.h>
L0014    
L0015    
L0016    #define loadlib_c
L0017    #define LUA_LIB
L0018    
L0019    #include "lua.h"
L0020    
L0021    #include "lauxlib.h"
L0022    #include "lualib.h"
L0023    
L0024    
L0025    /* prefix for open functions in C libraries */
L0026    #define LUA_POF		"luaopen_"
L0027    
L0028    /* separator for open functions in C libraries */
L0029    #define LUA_OFSEP	"_"
L0030    
L0031    
L0032    #define LIBPREFIX	"LOADLIB: "
L0033    
L0034    #define POF		LUA_POF
L0035    #define LIB_FAIL	"open"
L0036    
L0037    
L0038    /* error codes for ll_loadfunc */
L0039    #define ERRLIB		1
L0040    #define ERRFUNC		2
L0041    
L0042    #define setprogdir(L)		((void)0)
L0043    
L0044    
L0045    static void ll_unloadlib (void *lib);
L0046    static void *ll_load (lua_State *L, const char *path);
L0047    static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym);
L0048    
L0049    
L0050    
L0051    #if defined(LUA_DL_DLOPEN)
L0052    /*
L0053    ** {========================================================================
L0054    ** This is an implementation of loadlib based on the dlfcn interface.
L0055    ** The dlfcn interface is available in Linux, SunOS, Solaris, IRIX, FreeBSD,
L0056    ** NetBSD, AIX 4.2, HPUX 11, and  probably most other Unix flavors, at least
L0057    ** as an emulation layer on top of native functions.
L0058    ** =========================================================================
L0059    */
L0060    
L0061    #include <dlfcn.h>
L0062    
L0063    static void ll_unloadlib (void *lib) {
L0064      dlclose(lib);
L0065    }
L0066    
L0067    
L0068    static void *ll_load (lua_State *L, const char *path) {
L0069      void *lib = dlopen(path, RTLD_NOW);
L0070      if (lib == NULL) lua_pushstring(L, dlerror());
L0071      return lib;
L0072    }
L0073    
L0074    
L0075    static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {
L0076      lua_CFunction f = (lua_CFunction)dlsym(lib, sym);
L0077      if (f == NULL) lua_pushstring(L, dlerror());
L0078      return f;
L0079    }
L0080    
L0081    /* }====================================================== */
L0082    
L0083    
L0084    
L0085    #elif defined(LUA_DL_DLL)
L0086    /*
L0087    ** {======================================================================
L0088    ** This is an implementation of loadlib for Windows using native functions.
L0089    ** =======================================================================
L0090    */
L0091    
L0092    #include <windows.h>
L0093    
L0094    
L0095    #undef setprogdir
L0096    
L0097    static void setprogdir (lua_State *L) {
L0098      char buff[MAX_PATH + 1];
L0099      char *lb;
L0100      DWORD nsize = sizeof(buff)/sizeof(char);
L0101      DWORD n = GetModuleFileNameA(NULL, buff, nsize);
L0102      if (n == 0 || n == nsize || (lb = strrchr(buff, '\\')) == NULL)
L0103        luaL_error(L, "unable to get ModuleFileName");
L0104      else {
L0105        *lb = '\0';
L0106        luaL_gsub(L, lua_tostring(L, -1), LUA_EXECDIR, buff);
L0107        lua_remove(L, -2);  /* remove original string */
L0108      }
L0109    }
L0110    
L0111    
L0112    static void pusherror (lua_State *L) {
L0113      int error = GetLastError();
L0114      char buffer[128];
L0115      if (FormatMessageA(FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_FROM_SYSTEM,
L0116          NULL, error, 0, buffer, sizeof(buffer), NULL))
L0117        lua_pushstring(L, buffer);
L0118      else
L0119        lua_pushfstring(L, "system error %d\n", error);
L0120    }
L0121    
L0122    static void ll_unloadlib (void *lib) {
L0123      FreeLibrary((HINSTANCE)lib);
L0124    }
L0125    
L0126    
L0127    static void *ll_load (lua_State *L, const char *path) {
L0128      HINSTANCE lib = LoadLibraryA(path);
L0129      if (lib == NULL) pusherror(L);
L0130      return lib;
L0131    }
L0132    
L0133    
L0134    static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {
L0135      lua_CFunction f = (lua_CFunction)GetProcAddress((HINSTANCE)lib, sym);
L0136      if (f == NULL) pusherror(L);
L0137      return f;
L0138    }
L0139    
L0140    /* }====================================================== */
L0141    
L0142    
L0143    
L0144    #elif defined(LUA_DL_DYLD)
L0145    /*
L0146    ** {======================================================================
L0147    ** Native Mac OS X / Darwin Implementation
L0148    ** =======================================================================
L0149    */
L0150    
L0151    #include <mach-o/dyld.h>
L0152    
L0153    
L0154    /* Mac appends a `_' before C function names */
L0155    #undef POF
L0156    #define POF	"_" LUA_POF
L0157    
L0158    
L0159    static void pusherror (lua_State *L) {
L0160      const char *err_str;
L0161      const char *err_file;
L0162      NSLinkEditErrors err;
L0163      int err_num;
L0164      NSLinkEditError(&err, &err_num, &err_file, &err_str);
L0165      lua_pushstring(L, err_str);
L0166    }
L0167    
L0168    
L0169    static const char *errorfromcode (NSObjectFileImageReturnCode ret) {
L0170      switch (ret) {
L0171        case NSObjectFileImageInappropriateFile:
L0172          return "file is not a bundle";
L0173        case NSObjectFileImageArch:
L0174          return "library is for wrong CPU type";
L0175        case NSObjectFileImageFormat:
L0176          return "bad format";
L0177        case NSObjectFileImageAccess:
L0178          return "cannot access file";
L0179        case NSObjectFileImageFailure:
L0180        default:
L0181          return "unable to load library";
L0182      }
L0183    }
L0184    
L0185    
L0186    static void ll_unloadlib (void *lib) {
L0187      NSUnLinkModule((NSModule)lib, NSUNLINKMODULE_OPTION_RESET_LAZY_REFERENCES);
L0188    }
L0189    
L0190    
L0191    static void *ll_load (lua_State *L, const char *path) {
L0192      NSObjectFileImage img;
L0193      NSObjectFileImageReturnCode ret;
L0194      /* this would be a rare case, but prevents crashing if it happens */
L0195      if(!_dyld_present()) {
L0196        lua_pushliteral(L, "dyld not present");
L0197        return NULL;
L0198      }
L0199      ret = NSCreateObjectFileImageFromFile(path, &img);
L0200      if (ret == NSObjectFileImageSuccess) {
L0201        NSModule mod = NSLinkModule(img, path, NSLINKMODULE_OPTION_PRIVATE |
L0202                           NSLINKMODULE_OPTION_RETURN_ON_ERROR);
L0203        NSDestroyObjectFileImage(img);
L0204        if (mod == NULL) pusherror(L);
L0205        return mod;
L0206      }
L0207      lua_pushstring(L, errorfromcode(ret));
L0208      return NULL;
L0209    }
L0210    
L0211    
L0212    static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {
L0213      NSSymbol nss = NSLookupSymbolInModule((NSModule)lib, sym);
L0214      if (nss == NULL) {
L0215        lua_pushfstring(L, "symbol " LUA_QS " not found", sym);
L0216        return NULL;
L0217      }
L0218      return (lua_CFunction)NSAddressOfSymbol(nss);
L0219    }
L0220    
L0221    /* }====================================================== */
L0222    
L0223    
L0224    
L0225    #else
L0226    /*
L0227    ** {======================================================
L0228    ** Fallback for other systems
L0229    ** =======================================================
L0230    */
L0231    
L0232    #undef LIB_FAIL
L0233    #define LIB_FAIL	"absent"
L0234    
L0235    
L0236    #define DLMSG	"dynamic libraries not enabled; check your Lua installation"
L0237    
L0238    
L0239    static void ll_unloadlib (void *lib) {
L0240      (void)lib;  /* to avoid warnings */
L0241    }
L0242    
L0243    
L0244    static void *ll_load (lua_State *L, const char *path) {
L0245      (void)path;  /* to avoid warnings */
L0246      lua_pushliteral(L, DLMSG);
L0247      return NULL;
L0248    }
L0249    
L0250    
L0251    static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {
L0252      (void)lib; (void)sym;  /* to avoid warnings */
L0253      lua_pushliteral(L, DLMSG);
L0254      return NULL;
L0255    }
L0256    
L0257    /* }====================================================== */
L0258    #endif
L0259    
L0260    
L0261    
L0262    static void **ll_register (lua_State *L, const char *path) {
L0263      void **plib;
L0264      lua_pushfstring(L, "%s%s", LIBPREFIX, path);
L0265      lua_gettable(L, LUA_REGISTRYINDEX);  /* check library in registry? */
L0266      if (!lua_isnil(L, -1))  /* is there an entry? */
L0267        plib = (void **)lua_touserdata(L, -1);
L0268      else {  /* no entry yet; create one */
L0269        lua_pop(L, 1);
L0270        plib = (void **)lua_newuserdata(L, sizeof(const void *));
L0271        *plib = NULL;
L0272        luaL_getmetatable(L, "_LOADLIB");
L0273        lua_setmetatable(L, -2);
L0274        lua_pushfstring(L, "%s%s", LIBPREFIX, path);
L0275        lua_pushvalue(L, -2);
L0276        lua_settable(L, LUA_REGISTRYINDEX);
L0277      }
L0278      return plib;
L0279    }
L0280    
L0281    
L0282    /*
L0283    ** __gc tag method: calls library's `ll_unloadlib' function with the lib
L0284    ** handle
L0285    */
L0286    static int gctm (lua_State *L) {
L0287      void **lib = (void **)luaL_checkudata(L, 1, "_LOADLIB");
L0288      if (*lib) ll_unloadlib(*lib);
L0289      *lib = NULL;  /* mark library as closed */
L0290      return 0;
L0291    }
L0292    
L0293    
L0294    static int ll_loadfunc (lua_State *L, const char *path, const char *sym) {
L0295      void **reg = ll_register(L, path);
L0296      if (*reg == NULL) *reg = ll_load(L, path);
L0297      if (*reg == NULL)
L0298        return ERRLIB;  /* unable to load library */
L0299      else {
L0300        lua_CFunction f = ll_sym(L, *reg, sym);
L0301        if (f == NULL)
L0302          return ERRFUNC;  /* unable to find function */
L0303        lua_pushcfunction(L, f);
L0304        return 0;  /* return function */
L0305      }
L0306    }
L0307    
L0308    
L0309    static int ll_loadlib (lua_State *L) {
L0310      const char *path = luaL_checkstring(L, 1);
L0311      const char *init = luaL_checkstring(L, 2);
L0312      int stat = ll_loadfunc(L, path, init);
L0313      if (stat == 0)  /* no errors? */
L0314        return 1;  /* return the loaded function */
L0315      else {  /* error; error message is on stack top */
L0316        lua_pushnil(L);
L0317        lua_insert(L, -2);
L0318        lua_pushstring(L, (stat == ERRLIB) ?  LIB_FAIL : "init");
L0319        return 3;  /* return nil, error message, and where */
L0320      }
L0321    }
L0322    
L0323    
L0324    
L0325    /*
L0326    ** {======================================================
L0327    ** 'require' function
L0328    ** =======================================================
L0329    */
L0330    
L0331    
L0332    static int readable (const char *filename) {
L0333      FILE *f = fopen(filename, "r");  /* try to open file */
L0334      if (f == NULL) return 0;  /* open failed */
L0335      fclose(f);
L0336      return 1;
L0337    }
L0338    
L0339    
L0340    static const char *pushnexttemplate (lua_State *L, const char *path) {
L0341      const char *l;
L0342      while (*path == *LUA_PATHSEP) path++;  /* skip separators */
L0343      if (*path == '\0') return NULL;  /* no more templates */
L0344      l = strchr(path, *LUA_PATHSEP);  /* find next separator */
L0345      if (l == NULL) l = path + strlen(path);
L0346      lua_pushlstring(L, path, l - path);  /* template */
L0347      return l;
L0348    }
L0349    
L0350    
L0351    static const char *findfile (lua_State *L, const char *name,
L0352                                               const char *pname) {
L0353      const char *path;
L0354      name = luaL_gsub(L, name, ".", LUA_DIRSEP);
L0355      lua_getfield(L, LUA_ENVIRONINDEX, pname);
L0356      path = lua_tostring(L, -1);
L0357      if (path == NULL)
L0358        luaL_error(L, LUA_QL("package.%s") " must be a string", pname);
L0359      lua_pushliteral(L, "");  /* error accumulator */
L0360      while ((path = pushnexttemplate(L, path)) != NULL) {
L0361        const char *filename;
L0362        filename = luaL_gsub(L, lua_tostring(L, -1), LUA_PATH_MARK, name);
L0363        lua_remove(L, -2);  /* remove path template */
L0364        if (readable(filename))  /* does file exist and is readable? */
L0365          return filename;  /* return that file name */
L0366        lua_pushfstring(L, "\n\tno file " LUA_QS, filename);
L0367        lua_remove(L, -2);  /* remove file name */
L0368        lua_concat(L, 2);  /* add entry to possible error message */
L0369      }
L0370      return NULL;  /* not found */
L0371    }
L0372    
L0373    
L0374    static void loaderror (lua_State *L, const char *filename) {
L0375      luaL_error(L, "error loading module " LUA_QS " from file " LUA_QS ":\n\t%s",
L0376                    lua_tostring(L, 1), filename, lua_tostring(L, -1));
L0377    }
L0378    
L0379    
L0380    static int loader_Lua (lua_State *L) {
L0381      const char *filename;
L0382      const char *name = luaL_checkstring(L, 1);
L0383      filename = findfile(L, name, "path");
L0384      if (filename == NULL) return 1;  /* library not found in this path */
L0385      if (luaL_loadfile(L, filename) != 0)
L0386        loaderror(L, filename);
L0387      return 1;  /* library loaded successfully */
L0388    }
L0389    
L0390    
L0391    static const char *mkfuncname (lua_State *L, const char *modname) {
L0392      const char *funcname;
L0393      const char *mark = strchr(modname, *LUA_IGMARK);
L0394      if (mark) modname = mark + 1;
L0395      funcname = luaL_gsub(L, modname, ".", LUA_OFSEP);
L0396      funcname = lua_pushfstring(L, POF"%s", funcname);
L0397      lua_remove(L, -2);  /* remove 'gsub' result */
L0398      return funcname;
L0399    }
L0400    
L0401    
L0402    static int loader_C (lua_State *L) {
L0403      const char *funcname;
L0404      const char *name = luaL_checkstring(L, 1);
L0405      const char *filename = findfile(L, name, "cpath");
L0406      if (filename == NULL) return 1;  /* library not found in this path */
L0407      funcname = mkfuncname(L, name);
L0408      if (ll_loadfunc(L, filename, funcname) != 0)
L0409        loaderror(L, filename);
L0410      return 1;  /* library loaded successfully */
L0411    }
L0412    
L0413    
L0414    static int loader_Croot (lua_State *L) {
L0415      const char *funcname;
L0416      const char *filename;
L0417      const char *name = luaL_checkstring(L, 1);
L0418      const char *p = strchr(name, '.');
L0419      int stat;
L0420      if (p == NULL) return 0;  /* is root */
L0421      lua_pushlstring(L, name, p - name);
L0422      filename = findfile(L, lua_tostring(L, -1), "cpath");
L0423      if (filename == NULL) return 1;  /* root not found */
L0424      funcname = mkfuncname(L, name);
L0425      if ((stat = ll_loadfunc(L, filename, funcname)) != 0) {
L0426        if (stat != ERRFUNC) loaderror(L, filename);  /* real error */
L0427        lua_pushfstring(L, "\n\tno module " LUA_QS " in file " LUA_QS,
L0428                           name, filename);
L0429        return 1;  /* function not found */
L0430      }
L0431      return 1;
L0432    }
L0433    
L0434    
L0435    static int loader_preload (lua_State *L) {
L0436      const char *name = luaL_checkstring(L, 1);
L0437      lua_getfield(L, LUA_ENVIRONINDEX, "preload");
L0438      if (!lua_istable(L, -1))
L0439        luaL_error(L, LUA_QL("package.preload") " must be a table");
L0440      lua_getfield(L, -1, name);
L0441      if (lua_isnil(L, -1))  /* not found? */
L0442        lua_pushfstring(L, "\n\tno field package.preload['%s']", name);
L0443      return 1;
L0444    }
L0445    
L0446    
L0447    static const int sentinel_ = 0;
L0448    #define sentinel	((void *)&sentinel_)
L0449    
L0450    
L0451    static int ll_require (lua_State *L) {
L0452      const char *name = luaL_checkstring(L, 1);
L0453      int i;
L0454      lua_settop(L, 1);  /* _LOADED table will be at index 2 */
L0455      lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
L0456      lua_getfield(L, 2, name);
L0457      if (lua_toboolean(L, -1)) {  /* is it there? */
L0458        if (lua_touserdata(L, -1) == sentinel)  /* check loops */
L0459          luaL_error(L, "loop or previous error loading module " LUA_QS, name);
L0460        return 1;  /* package is already loaded */
L0461      }
L0462      /* else must load it; iterate over available loaders */
L0463      lua_getfield(L, LUA_ENVIRONINDEX, "loaders");
L0464      if (!lua_istable(L, -1))
L0465        luaL_error(L, LUA_QL("package.loaders") " must be a table");
L0466      lua_pushliteral(L, "");  /* error message accumulator */
L0467      for (i=1; ; i++) {
L0468        lua_rawgeti(L, -2, i);  /* get a loader */
L0469        if (lua_isnil(L, -1))
L0470          luaL_error(L, "module " LUA_QS " not found:%s",
L0471                        name, lua_tostring(L, -2));
L0472        lua_pushstring(L, name);
L0473        lua_call(L, 1, 1);  /* call it */
L0474        if (lua_isfunction(L, -1))  /* did it find module? */
L0475          break;  /* module loaded successfully */
L0476        else if (lua_isstring(L, -1))  /* loader returned error message? */
L0477          lua_concat(L, 2);  /* accumulate it */
L0478        else
L0479          lua_pop(L, 1);
L0480      }
L0481      lua_pushlightuserdata(L, sentinel);
L0482      lua_setfield(L, 2, name);  /* _LOADED[name] = sentinel */
L0483      lua_pushstring(L, name);  /* pass name as argument to module */
L0484      lua_call(L, 1, 1);  /* run loaded module */
L0485      if (!lua_isnil(L, -1))  /* non-nil return? */
L0486        lua_setfield(L, 2, name);  /* _LOADED[name] = returned value */
L0487      lua_getfield(L, 2, name);
L0488      if (lua_touserdata(L, -1) == sentinel) {   /* module did not set a value? */
L0489        lua_pushboolean(L, 1);  /* use true as result */
L0490        lua_pushvalue(L, -1);  /* extra copy to be returned */
L0491        lua_setfield(L, 2, name);  /* _LOADED[name] = true */
L0492      }
L0493      return 1;
L0494    }
L0495    
L0496    /* }====================================================== */
L0497    
L0498    
L0499    
L0500    /*
L0501    ** {======================================================
L0502    ** 'module' function
L0503    ** =======================================================
L0504    */
L0505      
L0506    
L0507    static void setfenv (lua_State *L) {
L0508      lua_Debug ar;
L0509      if (lua_getstack(L, 1, &ar) == 0 ||
L0510          lua_getinfo(L, "f", &ar) == 0 ||  /* get calling function */
L0511          lua_iscfunction(L, -1))
L0512        luaL_error(L, LUA_QL("module") " not called from a Lua function");
L0513      lua_pushvalue(L, -2);
L0514      lua_setfenv(L, -2);
L0515      lua_pop(L, 1);
L0516    }
L0517    
L0518    
L0519    static void dooptions (lua_State *L, int n) {
L0520      int i;
L0521      for (i = 2; i <= n; i++) {
L0522        lua_pushvalue(L, i);  /* get option (a function) */
L0523        lua_pushvalue(L, -2);  /* module */
L0524        lua_call(L, 1, 0);
L0525      }
L0526    }
L0527    
L0528    
L0529    static void modinit (lua_State *L, const char *modname) {
L0530      const char *dot;
L0531      lua_pushvalue(L, -1);
L0532      lua_setfield(L, -2, "_M");  /* module._M = module */
L0533      lua_pushstring(L, modname);
L0534      lua_setfield(L, -2, "_NAME");
L0535      dot = strrchr(modname, '.');  /* look for last dot in module name */
L0536      if (dot == NULL) dot = modname;
L0537      else dot++;
L0538      /* set _PACKAGE as package name (full module name minus last part) */
L0539      lua_pushlstring(L, modname, dot - modname);
L0540      lua_setfield(L, -2, "_PACKAGE");
L0541    }
L0542    
L0543    
L0544    static int ll_module (lua_State *L) {
L0545      const char *modname = luaL_checkstring(L, 1);
L0546      int loaded = lua_gettop(L) + 1;  /* index of _LOADED table */
L0547      lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
L0548      lua_getfield(L, loaded, modname);  /* get _LOADED[modname] */
L0549      if (!lua_istable(L, -1)) {  /* not found? */
L0550        lua_pop(L, 1);  /* remove previous result */
L0551        /* try global variable (and create one if it does not exist) */
L0552        if (luaL_findtable(L, LUA_GLOBALSINDEX, modname, 1) != NULL)
L0553          return luaL_error(L, "name conflict for module " LUA_QS, modname);
L0554        lua_pushvalue(L, -1);
L0555        lua_setfield(L, loaded, modname);  /* _LOADED[modname] = new table */
L0556      }
L0557      /* check whether table already has a _NAME field */
L0558      lua_getfield(L, -1, "_NAME");
L0559      if (!lua_isnil(L, -1))  /* is table an initialized module? */
L0560        lua_pop(L, 1);
L0561      else {  /* no; initialize it */
L0562        lua_pop(L, 1);
L0563        modinit(L, modname);
L0564      }
L0565      lua_pushvalue(L, -1);
L0566      setfenv(L);
L0567      dooptions(L, loaded - 1);
L0568      return 0;
L0569    }
L0570    
L0571    
L0572    static int ll_seeall (lua_State *L) {
L0573      luaL_checktype(L, 1, LUA_TTABLE);
L0574      if (!lua_getmetatable(L, 1)) {
L0575        lua_createtable(L, 0, 1); /* create new metatable */
L0576        lua_pushvalue(L, -1);
L0577        lua_setmetatable(L, 1);
L0578      }
L0579      lua_pushvalue(L, LUA_GLOBALSINDEX);
L0580      lua_setfield(L, -2, "__index");  /* mt.__index = _G */
L0581      return 0;
L0582    }
L0583    
L0584    
L0585    /* }====================================================== */
L0586    
L0587    
L0588    
L0589    /* auxiliary mark (for internal use) */
L0590    #define AUXMARK		"\1"
L0591    
L0592    static void setpath (lua_State *L, const char *fieldname, const char *envname,
L0593                                       const char *def) {
L0594      const char *path = getenv(envname);
L0595      if (path == NULL)  /* no environment variable? */
L0596        lua_pushstring(L, def);  /* use default */
L0597      else {
L0598        /* replace ";;" by ";AUXMARK;" and then AUXMARK by default path */
L0599        path = luaL_gsub(L, path, LUA_PATHSEP LUA_PATHSEP,
L0600                                  LUA_PATHSEP AUXMARK LUA_PATHSEP);
L0601        luaL_gsub(L, path, AUXMARK, def);
L0602        lua_remove(L, -2);
L0603      }
L0604      setprogdir(L);
L0605      lua_setfield(L, -2, fieldname);
L0606    }
L0607    
L0608    
L0609    static const luaL_Reg pk_funcs[] = {
L0610      {"loadlib", ll_loadlib},
L0611      {"seeall", ll_seeall},
L0612      {NULL, NULL}
L0613    };
L0614    
L0615    
L0616    static const luaL_Reg ll_funcs[] = {
L0617      {"module", ll_module},
L0618      {"require", ll_require},
L0619      {NULL, NULL}
L0620    };
L0621    
L0622    
L0623    static const lua_CFunction loaders[] =
L0624      {loader_preload, loader_Lua, loader_C, loader_Croot, NULL};
L0625    
L0626    
L0627    LUALIB_API int luaopen_package (lua_State *L) {
L0628      int i;
L0629      /* create new type _LOADLIB */
L0630      luaL_newmetatable(L, "_LOADLIB");
L0631      lua_pushcfunction(L, gctm);
L0632      lua_setfield(L, -2, "__gc");
L0633      /* create `package' table */
L0634      luaL_register(L, LUA_LOADLIBNAME, pk_funcs);
L0635    #if defined(LUA_COMPAT_LOADLIB) 
L0636      lua_getfield(L, -1, "loadlib");
L0637      lua_setfield(L, LUA_GLOBALSINDEX, "loadlib");
L0638    #endif
L0639      lua_pushvalue(L, -1);
L0640      lua_replace(L, LUA_ENVIRONINDEX);
L0641      /* create `loaders' table */
L0642      lua_createtable(L, 0, sizeof(loaders)/sizeof(loaders[0]) - 1);
L0643      /* fill it with pre-defined loaders */
L0644      for (i=0; loaders[i] != NULL; i++) {
L0645        lua_pushcfunction(L, loaders[i]);
L0646        lua_rawseti(L, -2, i+1);
L0647      }
L0648      lua_setfield(L, -2, "loaders");  /* put it in field `loaders' */
L0649      setpath(L, "path", LUA_PATH, LUA_PATH_DEFAULT);  /* set field `path' */
L0650      setpath(L, "cpath", LUA_CPATH, LUA_CPATH_DEFAULT); /* set field `cpath' */
L0651      /* store config information */
L0652      lua_pushliteral(L, LUA_DIRSEP "\n" LUA_PATHSEP "\n" LUA_PATH_MARK "\n"
L0653                         LUA_EXECDIR "\n" LUA_IGMARK);
L0654      lua_setfield(L, -2, "config");
L0655      /* set field `loaded' */
L0656      luaL_findtable(L, LUA_REGISTRYINDEX, "_LOADED", 2);
L0657      lua_setfield(L, -2, "loaded");
L0658      /* set field `preload' */
L0659      lua_newtable(L);
L0660      lua_setfield(L, -2, "preload");
L0661      lua_pushvalue(L, LUA_GLOBALSINDEX);
L0662      luaL_register(L, NULL, ll_funcs);  /* open lib into global table */
L0663      lua_pop(L, 1);
L0664      return 1;  /* return 'package' table */
L0665    }
L0666