--- /dev/null
+/*\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
projects / mirror_edk2.git / blobdiff