EmbeddedPkg: Extend NvVarStoreFormattedLib LIBRARY_CLASS

[mirror_edk2.git] / AppPkg / Applications / Lua / src / loadlib.c

/*\r
** $Id: loadlib.c,v 1.111.1.1 2013/04/12 18:48:47 roberto Exp $\r
** Dynamic library loader for Lua\r
** See Copyright Notice in lua.h\r
**\r
** This module contains an implementation of loadlib for Unix systems\r
** that have dlfcn, an implementation for Windows, and a stub for other\r
** systems.\r
*/\r
\r
\r
/*\r
** if needed, includes windows header before everything else\r
*/\r
#if defined(_WIN32) && !defined(UEFI_C_SOURCE) && !defined(_DOS_WATCOM)\r
#include <windows.h>\r
#endif\r
\r
\r
#include <stdlib.h>\r
#include <string.h>\r
\r
\r
#define loadlib_c\r
#define LUA_LIB\r
\r
#include "lua.h"\r
\r
#include "lauxlib.h"\r
#include "lualib.h"\r
\r
\r
/*\r
** LUA_PATH and LUA_CPATH are the names of the environment\r
** variables that Lua check to set its paths.\r
*/\r
#if !defined(LUA_PATH)\r
#define LUA_PATH    "LUA_PATH"\r
#endif\r
\r
#if !defined(LUA_CPATH)\r
#define LUA_CPATH   "LUA_CPATH"\r
#endif\r
\r
#define LUA_PATHSUFFIX      "_" LUA_VERSION_MAJOR "_" LUA_VERSION_MINOR\r
\r
#define LUA_PATHVERSION     LUA_PATH LUA_PATHSUFFIX\r
#define LUA_CPATHVERSION    LUA_CPATH LUA_PATHSUFFIX\r
\r
/*\r
** LUA_PATH_SEP is the character that separates templates in a path.\r
** LUA_PATH_MARK is the string that marks the substitution points in a\r
** template.\r
** LUA_EXEC_DIR in a Windows path is replaced by the executable's\r
** directory.\r
** LUA_IGMARK is a mark to ignore all before it when building the\r
** luaopen_ function name.\r
*/\r
#if !defined (LUA_PATH_SEP)\r
#define LUA_PATH_SEP        ";"\r
#endif\r
#if !defined (LUA_PATH_MARK)\r
#define LUA_PATH_MARK       "?"\r
#endif\r
#if !defined (LUA_EXEC_DIR)\r
#define LUA_EXEC_DIR        "!"\r
#endif\r
#if !defined (LUA_IGMARK)\r
#define LUA_IGMARK      "-"\r
#endif\r
\r
\r
/*\r
** LUA_CSUBSEP is the character that replaces dots in submodule names\r
** when searching for a C loader.\r
** LUA_LSUBSEP is the character that replaces dots in submodule names\r
** when searching for a Lua loader.\r
*/\r
#if !defined(LUA_CSUBSEP)\r
#define LUA_CSUBSEP     LUA_DIRSEP\r
#endif\r
\r
#if !defined(LUA_LSUBSEP)\r
#define LUA_LSUBSEP     LUA_DIRSEP\r
#endif\r
\r
\r
/* prefix for open functions in C libraries */\r
#define LUA_POF     "luaopen_"\r
\r
/* separator for open functions in C libraries */\r
#define LUA_OFSEP   "_"\r
\r
\r
/* table (in the registry) that keeps handles for all loaded C libraries */\r
#define CLIBS       "_CLIBS"\r
\r
#define LIB_FAIL    "open"\r
\r
\r
/* error codes for ll_loadfunc */\r
#define ERRLIB      1\r
#define ERRFUNC     2\r
\r
#define setprogdir(L)       ((void)0)\r
\r
\r
/*\r
** system-dependent functions\r
*/\r
static void ll_unloadlib (void *lib);\r
static void *ll_load (lua_State *L, const char *path, int seeglb);\r
static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym);\r
\r
\r
\r
#if defined(LUA_USE_DLOPEN)\r
/*\r
** {========================================================================\r
** This is an implementation of loadlib based on the dlfcn interface.\r
** The dlfcn interface is available in Linux, SunOS, Solaris, IRIX, FreeBSD,\r
** NetBSD, AIX 4.2, HPUX 11, and  probably most other Unix flavors, at least\r
** as an emulation layer on top of native functions.\r
** =========================================================================\r
*/\r
\r
#include <dlfcn.h>\r
\r
static void ll_unloadlib (void *lib) {\r
  dlclose(lib);\r
}\r
\r
\r
static void *ll_load (lua_State *L, const char *path, int seeglb) {\r
  void *lib = dlopen(path, RTLD_NOW | (seeglb ? RTLD_GLOBAL : RTLD_LOCAL));\r
  if (lib == NULL) lua_pushstring(L, dlerror());\r
  return lib;\r
}\r
\r
\r
static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {\r
  lua_CFunction f = (lua_CFunction)dlsym(lib, sym);\r
  if (f == NULL) lua_pushstring(L, dlerror());\r
  return f;\r
}\r
\r
/* }====================================================== */\r
\r
\r
\r
#elif defined(LUA_DL_DLL)\r
/*\r
** {======================================================================\r
** This is an implementation of loadlib for Windows using native functions.\r
** =======================================================================\r
*/\r
\r
#undef setprogdir\r
\r
/*\r
** optional flags for LoadLibraryEx\r
*/\r
#if !defined(LUA_LLE_FLAGS)\r
#define LUA_LLE_FLAGS   0\r
#endif\r
\r
\r
static void setprogdir (lua_State *L) {\r
  char buff[MAX_PATH + 1];\r
  char *lb;\r
  DWORD nsize = sizeof(buff)/sizeof(char);\r
  DWORD n = GetModuleFileNameA(NULL, buff, nsize);\r
  if (n == 0 || n == nsize || (lb = strrchr(buff, '\\')) == NULL)\r
    luaL_error(L, "unable to get ModuleFileName");\r
  else {\r
    *lb = '\0';\r
    luaL_gsub(L, lua_tostring(L, -1), LUA_EXEC_DIR, buff);\r
    lua_remove(L, -2);  /* remove original string */\r
  }\r
}\r
\r
\r
static void pusherror (lua_State *L) {\r
  int error = GetLastError();\r
  char buffer[128];\r
  if (FormatMessageA(FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_FROM_SYSTEM,\r
      NULL, error, 0, buffer, sizeof(buffer)/sizeof(char), NULL))\r
    lua_pushstring(L, buffer);\r
  else\r
    lua_pushfstring(L, "system error %d\n", error);\r
}\r
\r
static void ll_unloadlib (void *lib) {\r
  FreeLibrary((HMODULE)lib);\r
}\r
\r
\r
static void *ll_load (lua_State *L, const char *path, int seeglb) {\r
  HMODULE lib = LoadLibraryExA(path, NULL, LUA_LLE_FLAGS);\r
  (void)(seeglb);  /* not used: symbols are 'global' by default */\r
  if (lib == NULL) pusherror(L);\r
  return lib;\r
}\r
\r
\r
static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {\r
  lua_CFunction f = (lua_CFunction)GetProcAddress((HMODULE)lib, sym);\r
  if (f == NULL) pusherror(L);\r
  return f;\r
}\r
\r
/* }====================================================== */\r
\r
\r
#else\r
/*\r
** {======================================================\r
** Fallback for other systems\r
** =======================================================\r
*/\r
\r
#undef LIB_FAIL\r
#define LIB_FAIL    "absent"\r
\r
\r
#define DLMSG   "dynamic libraries not enabled; check your Lua installation"\r
\r
\r
static void ll_unloadlib (void *lib) {\r
  (void)(lib);  /* not used */\r
}\r
\r
\r
static void *ll_load (lua_State *L, const char *path, int seeglb) {\r
  (void)(path); (void)(seeglb);  /* not used */\r
  lua_pushliteral(L, DLMSG);\r
  return NULL;\r
}\r
\r
\r
static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {\r
  (void)(lib); (void)(sym);  /* not used */\r
  lua_pushliteral(L, DLMSG);\r
  return NULL;\r
}\r
\r
/* }====================================================== */\r
#endif\r
\r
\r
static void *ll_checkclib (lua_State *L, const char *path) {\r
  void *plib;\r
  lua_getfield(L, LUA_REGISTRYINDEX, CLIBS);\r
  lua_getfield(L, -1, path);\r
  plib = lua_touserdata(L, -1);  /* plib = CLIBS[path] */\r
  lua_pop(L, 2);  /* pop CLIBS table and 'plib' */\r
  return plib;\r
}\r
\r
\r
static void ll_addtoclib (lua_State *L, const char *path, void *plib) {\r
  lua_getfield(L, LUA_REGISTRYINDEX, CLIBS);\r
  lua_pushlightuserdata(L, plib);\r
  lua_pushvalue(L, -1);\r
  lua_setfield(L, -3, path);  /* CLIBS[path] = plib */\r
  lua_rawseti(L, -2, luaL_len(L, -2) + 1);  /* CLIBS[#CLIBS + 1] = plib */\r
  lua_pop(L, 1);  /* pop CLIBS table */\r
}\r
\r
\r
/*\r
** __gc tag method for CLIBS table: calls 'll_unloadlib' for all lib\r
** handles in list CLIBS\r
*/\r
static int gctm (lua_State *L) {\r
  int n = luaL_len(L, 1);\r
  for (; n >= 1; n--) {  /* for each handle, in reverse order */\r
    lua_rawgeti(L, 1, n);  /* get handle CLIBS[n] */\r
    ll_unloadlib(lua_touserdata(L, -1));\r
    lua_pop(L, 1);  /* pop handle */\r
  }\r
  return 0;\r
}\r
\r
\r
static int ll_loadfunc (lua_State *L, const char *path, const char *sym) {\r
  void *reg = ll_checkclib(L, path);  /* check loaded C libraries */\r
  if (reg == NULL) {  /* must load library? */\r
    reg = ll_load(L, path, *sym == '*');\r
    if (reg == NULL) return ERRLIB;  /* unable to load library */\r
    ll_addtoclib(L, path, reg);\r
  }\r
  if (*sym == '*') {  /* loading only library (no function)? */\r
    lua_pushboolean(L, 1);  /* return 'true' */\r
    return 0;  /* no errors */\r
  }\r
  else {\r
    lua_CFunction f = ll_sym(L, reg, sym);\r
    if (f == NULL)\r
      return ERRFUNC;  /* unable to find function */\r
    lua_pushcfunction(L, f);  /* else create new function */\r
    return 0;  /* no errors */\r
  }\r
}\r
\r
\r
static int ll_loadlib (lua_State *L) {\r
  const char *path = luaL_checkstring(L, 1);\r
  const char *init = luaL_checkstring(L, 2);\r
  int stat = ll_loadfunc(L, path, init);\r
  if (stat == 0)  /* no errors? */\r
    return 1;  /* return the loaded function */\r
  else {  /* error; error message is on stack top */\r
    lua_pushnil(L);\r
    lua_insert(L, -2);\r
    lua_pushstring(L, (stat == ERRLIB) ?  LIB_FAIL : "init");\r
    return 3;  /* return nil, error message, and where */\r
  }\r
}\r
\r
\r
\r
/*\r
** {======================================================\r
** 'require' function\r
** =======================================================\r
*/\r
\r
\r
static int readable (const char *filename) {\r
  FILE *f = fopen(filename, "r");  /* try to open file */\r
  if (f == NULL) return 0;  /* open failed */\r
  fclose(f);\r
  return 1;\r
}\r
\r
\r
static const char *pushnexttemplate (lua_State *L, const char *path) {\r
  const char *l;\r
  while (*path == *LUA_PATH_SEP) path++;  /* skip separators */\r
  if (*path == '\0') return NULL;  /* no more templates */\r
  l = strchr(path, *LUA_PATH_SEP);  /* find next separator */\r
  if (l == NULL) l = path + strlen(path);\r
  lua_pushlstring(L, path, l - path);  /* template */\r
  return l;\r
}\r
\r
\r
static const char *searchpath (lua_State *L, const char *name,\r
                                             const char *path,\r
                                             const char *sep,\r
                                             const char *dirsep) {\r
  luaL_Buffer msg;  /* to build error message */\r
  luaL_buffinit(L, &msg);\r
  if (*sep != '\0')  /* non-empty separator? */\r
    name = luaL_gsub(L, name, sep, dirsep);  /* replace it by 'dirsep' */\r
  while ((path = pushnexttemplate(L, path)) != NULL) {\r
    const char *filename = luaL_gsub(L, lua_tostring(L, -1),\r
                                     LUA_PATH_MARK, name);\r
    lua_remove(L, -2);  /* remove path template */\r
    if (readable(filename))  /* does file exist and is readable? */\r
      return filename;  /* return that file name */\r
    lua_pushfstring(L, "\n\tno file " LUA_QS, filename);\r
    lua_remove(L, -2);  /* remove file name */\r
    luaL_addvalue(&msg);  /* concatenate error msg. entry */\r
  }\r
  luaL_pushresult(&msg);  /* create error message */\r
  return NULL;  /* not found */\r
}\r
\r
\r
static int ll_searchpath (lua_State *L) {\r
  const char *f = searchpath(L, luaL_checkstring(L, 1),\r
                                luaL_checkstring(L, 2),\r
                                luaL_optstring(L, 3, "."),\r
                                luaL_optstring(L, 4, LUA_DIRSEP));\r
  if (f != NULL) return 1;\r
  else {  /* error message is on top of the stack */\r
    lua_pushnil(L);\r
    lua_insert(L, -2);\r
    return 2;  /* return nil + error message */\r
  }\r
}\r
\r
\r
static const char *findfile (lua_State *L, const char *name,\r
                                           const char *pname,\r
                                           const char *dirsep) {\r
  const char *path;\r
  lua_getfield(L, lua_upvalueindex(1), pname);\r
  path = lua_tostring(L, -1);\r
  if (path == NULL)\r
    luaL_error(L, LUA_QL("package.%s") " must be a string", pname);\r
  return searchpath(L, name, path, ".", dirsep);\r
}\r
\r
\r
static int checkload (lua_State *L, int stat, const char *filename) {\r
  if (stat) {  /* module loaded successfully? */\r
    lua_pushstring(L, filename);  /* will be 2nd argument to module */\r
    return 2;  /* return open function and file name */\r
  }\r
  else\r
    return luaL_error(L, "error loading module " LUA_QS\r
                         " from file " LUA_QS ":\n\t%s",\r
                          lua_tostring(L, 1), filename, lua_tostring(L, -1));\r
}\r
\r
\r
static int searcher_Lua (lua_State *L) {\r
  const char *filename;\r
  const char *name = luaL_checkstring(L, 1);\r
  filename = findfile(L, name, "path", LUA_LSUBSEP);\r
  if (filename == NULL) return 1;  /* module not found in this path */\r
  return checkload(L, (luaL_loadfile(L, filename) == LUA_OK), filename);\r
}\r
\r
\r
static int loadfunc (lua_State *L, const char *filename, const char *modname) {\r
  const char *funcname;\r
  const char *mark;\r
  modname = luaL_gsub(L, modname, ".", LUA_OFSEP);\r
  mark = strchr(modname, *LUA_IGMARK);\r
  if (mark) {\r
    int stat;\r
    funcname = lua_pushlstring(L, modname, mark - modname);\r
    funcname = lua_pushfstring(L, LUA_POF"%s", funcname);\r
    stat = ll_loadfunc(L, filename, funcname);\r
    if (stat != ERRFUNC) return stat;\r
    modname = mark + 1;  /* else go ahead and try old-style name */\r
  }\r
  funcname = lua_pushfstring(L, LUA_POF"%s", modname);\r
  return ll_loadfunc(L, filename, funcname);\r
}\r
\r
\r
static int searcher_C (lua_State *L) {\r
  const char *name = luaL_checkstring(L, 1);\r
  const char *filename = findfile(L, name, "cpath", LUA_CSUBSEP);\r
  if (filename == NULL) return 1;  /* module not found in this path */\r
  return checkload(L, (loadfunc(L, filename, name) == 0), filename);\r
}\r
\r
\r
static int searcher_Croot (lua_State *L) {\r
  const char *filename;\r
  const char *name = luaL_checkstring(L, 1);\r
  const char *p = strchr(name, '.');\r
  int stat;\r
  if (p == NULL) return 0;  /* is root */\r
  lua_pushlstring(L, name, p - name);\r
  filename = findfile(L, lua_tostring(L, -1), "cpath", LUA_CSUBSEP);\r
  if (filename == NULL) return 1;  /* root not found */\r
  if ((stat = loadfunc(L, filename, name)) != 0) {\r
    if (stat != ERRFUNC)\r
      return checkload(L, 0, filename);  /* real error */\r
    else {  /* open function not found */\r
      lua_pushfstring(L, "\n\tno module " LUA_QS " in file " LUA_QS,\r
                         name, filename);\r
      return 1;\r
    }\r
  }\r
  lua_pushstring(L, filename);  /* will be 2nd argument to module */\r
  return 2;\r
}\r
\r
\r
static int searcher_preload (lua_State *L) {\r
  const char *name = luaL_checkstring(L, 1);\r
  lua_getfield(L, LUA_REGISTRYINDEX, "_PRELOAD");\r
  lua_getfield(L, -1, name);\r
  if (lua_isnil(L, -1))  /* not found? */\r
    lua_pushfstring(L, "\n\tno field package.preload['%s']", name);\r
  return 1;\r
}\r
\r
\r
static void findloader (lua_State *L, const char *name) {\r
  int i;\r
  luaL_Buffer msg;  /* to build error message */\r
  luaL_buffinit(L, &msg);\r
  lua_getfield(L, lua_upvalueindex(1), "searchers");  /* will be at index 3 */\r
  if (!lua_istable(L, 3))\r
    luaL_error(L, LUA_QL("package.searchers") " must be a table");\r
  /*  iterate over available searchers to find a loader */\r
  for (i = 1; ; i++) {\r
    lua_rawgeti(L, 3, i);  /* get a searcher */\r
    if (lua_isnil(L, -1)) {  /* no more searchers? */\r
      lua_pop(L, 1);  /* remove nil */\r
      luaL_pushresult(&msg);  /* create error message */\r
      luaL_error(L, "module " LUA_QS " not found:%s",\r
                    name, lua_tostring(L, -1));\r
    }\r
    lua_pushstring(L, name);\r
    lua_call(L, 1, 2);  /* call it */\r
    if (lua_isfunction(L, -2))  /* did it find a loader? */\r
      return;  /* module loader found */\r
    else if (lua_isstring(L, -2)) {  /* searcher returned error message? */\r
      lua_pop(L, 1);  /* remove extra return */\r
      luaL_addvalue(&msg);  /* concatenate error message */\r
    }\r
    else\r
      lua_pop(L, 2);  /* remove both returns */\r
  }\r
}\r
\r
\r
static int ll_require (lua_State *L) {\r
  const char *name = luaL_checkstring(L, 1);\r
  lua_settop(L, 1);  /* _LOADED table will be at index 2 */\r
  lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");\r
  lua_getfield(L, 2, name);  /* _LOADED[name] */\r
  if (lua_toboolean(L, -1))  /* is it there? */\r
    return 1;  /* package is already loaded */\r
  /* else must load package */\r
  lua_pop(L, 1);  /* remove 'getfield' result */\r
  findloader(L, name);\r
  lua_pushstring(L, name);  /* pass name as argument to module loader */\r
  lua_insert(L, -2);  /* name is 1st argument (before search data) */\r
  lua_call(L, 2, 1);  /* run loader to load module */\r
  if (!lua_isnil(L, -1))  /* non-nil return? */\r
    lua_setfield(L, 2, name);  /* _LOADED[name] = returned value */\r
  lua_getfield(L, 2, name);\r
  if (lua_isnil(L, -1)) {   /* module did not set a value? */\r
    lua_pushboolean(L, 1);  /* use true as result */\r
    lua_pushvalue(L, -1);  /* extra copy to be returned */\r
    lua_setfield(L, 2, name);  /* _LOADED[name] = true */\r
  }\r
  return 1;\r
}\r
\r
/* }====================================================== */\r
\r
\r
\r
/*\r
** {======================================================\r
** 'module' function\r
** =======================================================\r
*/\r
#if defined(LUA_COMPAT_MODULE)\r
\r
/*\r
** changes the environment variable of calling function\r
*/\r
static void set_env (lua_State *L) {\r
  lua_Debug ar;\r
  if (lua_getstack(L, 1, &ar) == 0 ||\r
      lua_getinfo(L, "f", &ar) == 0 ||  /* get calling function */\r
      lua_iscfunction(L, -1))\r
    luaL_error(L, LUA_QL("module") " not called from a Lua function");\r
  lua_pushvalue(L, -2);  /* copy new environment table to top */\r
  lua_setupvalue(L, -2, 1);\r
  lua_pop(L, 1);  /* remove function */\r
}\r
\r
\r
static void dooptions (lua_State *L, int n) {\r
  int i;\r
  for (i = 2; i <= n; i++) {\r
    if (lua_isfunction(L, i)) {  /* avoid 'calling' extra info. */\r
      lua_pushvalue(L, i);  /* get option (a function) */\r
      lua_pushvalue(L, -2);  /* module */\r
      lua_call(L, 1, 0);\r
    }\r
  }\r
}\r
\r
\r
static void modinit (lua_State *L, const char *modname) {\r
  const char *dot;\r
  lua_pushvalue(L, -1);\r
  lua_setfield(L, -2, "_M");  /* module._M = module */\r
  lua_pushstring(L, modname);\r
  lua_setfield(L, -2, "_NAME");\r
  dot = strrchr(modname, '.');  /* look for last dot in module name */\r
  if (dot == NULL) dot = modname;\r
  else dot++;\r
  /* set _PACKAGE as package name (full module name minus last part) */\r
  lua_pushlstring(L, modname, dot - modname);\r
  lua_setfield(L, -2, "_PACKAGE");\r
}\r
\r
\r
static int ll_module (lua_State *L) {\r
  const char *modname = luaL_checkstring(L, 1);\r
  int lastarg = lua_gettop(L);  /* last parameter */\r
  luaL_pushmodule(L, modname, 1);  /* get/create module table */\r
  /* check whether table already has a _NAME field */\r
  lua_getfield(L, -1, "_NAME");\r
  if (!lua_isnil(L, -1))  /* is table an initialized module? */\r
    lua_pop(L, 1);\r
  else {  /* no; initialize it */\r
    lua_pop(L, 1);\r
    modinit(L, modname);\r
  }\r
  lua_pushvalue(L, -1);\r
  set_env(L);\r
  dooptions(L, lastarg);\r
  return 1;\r
}\r
\r
\r
static int ll_seeall (lua_State *L) {\r
  luaL_checktype(L, 1, LUA_TTABLE);\r
  if (!lua_getmetatable(L, 1)) {\r
    lua_createtable(L, 0, 1); /* create new metatable */\r
    lua_pushvalue(L, -1);\r
    lua_setmetatable(L, 1);\r
  }\r
  lua_pushglobaltable(L);\r
  lua_setfield(L, -2, "__index");  /* mt.__index = _G */\r
  return 0;\r
}\r
\r
#endif\r
/* }====================================================== */\r
\r
\r
\r
/* auxiliary mark (for internal use) */\r
#define AUXMARK     "\1"\r
\r
\r
/*\r
** return registry.LUA_NOENV as a boolean\r
*/\r
static int noenv (lua_State *L) {\r
  int b;\r
  lua_getfield(L, LUA_REGISTRYINDEX, "LUA_NOENV");\r
  b = lua_toboolean(L, -1);\r
  lua_pop(L, 1);  /* remove value */\r
  return b;\r
}\r
\r
\r
static void setpath (lua_State *L, const char *fieldname, const char *envname1,\r
                                   const char *envname2, const char *def) {\r
  const char *path = getenv(envname1);\r
  if (path == NULL)  /* no environment variable? */\r
    path = getenv(envname2);  /* try alternative name */\r
  if (path == NULL || noenv(L))  /* no environment variable? */\r
    lua_pushstring(L, def);  /* use default */\r
  else {\r
    /* replace ";;" by ";AUXMARK;" and then AUXMARK by default path */\r
    path = luaL_gsub(L, path, LUA_PATH_SEP LUA_PATH_SEP,\r
                              LUA_PATH_SEP AUXMARK LUA_PATH_SEP);\r
    luaL_gsub(L, path, AUXMARK, def);\r
    lua_remove(L, -2);\r
  }\r
  setprogdir(L);\r
  lua_setfield(L, -2, fieldname);\r
}\r
\r
\r
static const luaL_Reg pk_funcs[] = {\r
  {"loadlib", ll_loadlib},\r
  {"searchpath", ll_searchpath},\r
#if defined(LUA_COMPAT_MODULE)\r
  {"seeall", ll_seeall},\r
#endif\r
  {NULL, NULL}\r
};\r
\r
\r
static const luaL_Reg ll_funcs[] = {\r
#if defined(LUA_COMPAT_MODULE)\r
  {"module", ll_module},\r
#endif\r
  {"require", ll_require},\r
  {NULL, NULL}\r
};\r
\r
\r
static void createsearcherstable (lua_State *L) {\r
  static const lua_CFunction searchers[] =\r
    {searcher_preload, searcher_Lua, searcher_C, searcher_Croot, NULL};\r
  int i;\r
  /* create 'searchers' table */\r
  lua_createtable(L, sizeof(searchers)/sizeof(searchers[0]) - 1, 0);\r
  /* fill it with pre-defined searchers */\r
  for (i=0; searchers[i] != NULL; i++) {\r
    lua_pushvalue(L, -2);  /* set 'package' as upvalue for all searchers */\r
    lua_pushcclosure(L, searchers[i], 1);\r
    lua_rawseti(L, -2, i+1);\r
  }\r
}\r
\r
\r
LUAMOD_API int luaopen_package (lua_State *L) {\r
  /* create table CLIBS to keep track of loaded C libraries */\r
  luaL_getsubtable(L, LUA_REGISTRYINDEX, CLIBS);\r
  lua_createtable(L, 0, 1);  /* metatable for CLIBS */\r
  lua_pushcfunction(L, gctm);\r
  lua_setfield(L, -2, "__gc");  /* set finalizer for CLIBS table */\r
  lua_setmetatable(L, -2);\r
  /* create `package' table */\r
  luaL_newlib(L, pk_funcs);\r
  createsearcherstable(L);\r
#if defined(LUA_COMPAT_LOADERS)\r
  lua_pushvalue(L, -1);  /* make a copy of 'searchers' table */\r
  lua_setfield(L, -3, "loaders");  /* put it in field `loaders' */\r
#endif\r
  lua_setfield(L, -2, "searchers");  /* put it in field 'searchers' */\r
  /* set field 'path' */\r
  setpath(L, "path", LUA_PATHVERSION, LUA_PATH, LUA_PATH_DEFAULT);\r
  /* set field 'cpath' */\r
  setpath(L, "cpath", LUA_CPATHVERSION, LUA_CPATH, LUA_CPATH_DEFAULT);\r
  /* store config information */\r
  lua_pushliteral(L, LUA_DIRSEP "\n" LUA_PATH_SEP "\n" LUA_PATH_MARK "\n"\r
                     LUA_EXEC_DIR "\n" LUA_IGMARK "\n");\r
  lua_setfield(L, -2, "config");\r
  /* set field `loaded' */\r
  luaL_getsubtable(L, LUA_REGISTRYINDEX, "_LOADED");\r
  lua_setfield(L, -2, "loaded");\r
  /* set field `preload' */\r
  luaL_getsubtable(L, LUA_REGISTRYINDEX, "_PRELOAD");\r
  lua_setfield(L, -2, "preload");\r
  lua_pushglobaltable(L);\r
  lua_pushvalue(L, -2);  /* set 'package' as upvalue for next lib */\r
  luaL_setfuncs(L, ll_funcs, 1);  /* open lib into global table */\r
  lua_pop(L, 1);  /* pop global table */\r
  return 1;  /* return 'package' table */\r
}\r
\r