/* ** $Id: loadlib.c,v 1.99 2011/06/28 17:13:28 roberto Exp roberto $ ** Dynamic library loader for Lua ** See Copyright Notice in lua.h ** ** This module contains an implementation of loadlib for Unix systems ** that have dlfcn, an implementation for Windows, and a stub for other ** systems. */ #include #include #define loadlib_c #define LUA_LIB #include "lua.h" #include "lauxlib.h" #include "lualib.h" /* ** LUA_PATH and LUA_CPATH are the names of the environment ** variables that Lua check to set its paths. */ #if !defined(LUA_PATH) #define LUA_PATH "LUA_PATH" #endif #if !defined(LUA_CPATH) #define LUA_CPATH "LUA_CPATH" #endif #define LUA_PATHSUFFIX "_" LUA_VERSION_MAJOR "_" LUA_VERSION_MINOR #define LUA_PATHVERSION LUA_PATH LUA_PATHSUFFIX #define LUA_CPATHVERSION LUA_CPATH LUA_PATHSUFFIX /* ** LUA_PATH_SEP is the character that separates templates in a path. ** LUA_PATH_MARK is the string that marks the substitution points in a ** template. ** LUA_EXEC_DIR in a Windows path is replaced by the executable's ** directory. ** LUA_IGMARK is a mark to ignore all before it when building the ** luaopen_ function name. */ #if !defined (LUA_PATH_SEP) #define LUA_PATH_SEP ";" #endif #if !defined (LUA_PATH_MARK) #define LUA_PATH_MARK "?" #endif #if !defined (LUA_EXEC_DIR) #define LUA_EXEC_DIR "!" #endif #if !defined (LUA_IGMARK) #define LUA_IGMARK "-" #endif /* prefix for open functions in C libraries */ #define LUA_POF "luaopen_" /* separator for open functions in C libraries */ #define LUA_OFSEP "_" #define LIBPREFIX "LOADLIB: " #define POF LUA_POF #define LIB_FAIL "open" /* error codes for ll_loadfunc */ #define ERRLIB 1 #define ERRFUNC 2 #define setprogdir(L) ((void)0) /* ** system-dependent functions */ static void ll_unloadlib (void *lib); static void *ll_load (lua_State *L, const char *path, int seeglb); static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym); #if defined(LUA_USE_DLOPEN) /* ** {======================================================================== ** This is an implementation of loadlib based on the dlfcn interface. ** The dlfcn interface is available in Linux, SunOS, Solaris, IRIX, FreeBSD, ** NetBSD, AIX 4.2, HPUX 11, and probably most other Unix flavors, at least ** as an emulation layer on top of native functions. ** ========================================================================= */ #include static void ll_unloadlib (void *lib) { dlclose(lib); } static void *ll_load (lua_State *L, const char *path, int seeglb) { void *lib = dlopen(path, RTLD_NOW | (seeglb ? RTLD_GLOBAL : 0)); if (lib == NULL) lua_pushstring(L, dlerror()); return lib; } static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) { lua_CFunction f = (lua_CFunction)dlsym(lib, sym); if (f == NULL) lua_pushstring(L, dlerror()); return f; } /* }====================================================== */ #elif defined(LUA_DL_DLL) /* ** {====================================================================== ** This is an implementation of loadlib for Windows using native functions. ** ======================================================================= */ #include #undef setprogdir /* ** optional flags for LoadLibraryEx */ #if !defined(LUA_LLE_FLAGS) #define LUA_LLE_FLAGS 0 #endif static void setprogdir (lua_State *L) { char buff[MAX_PATH + 1]; char *lb; DWORD nsize = sizeof(buff)/sizeof(char); DWORD n = GetModuleFileNameA(NULL, buff, nsize); if (n == 0 || n == nsize || (lb = strrchr(buff, '\\')) == NULL) luaL_error(L, "unable to get ModuleFileName"); else { *lb = '\0'; luaL_gsub(L, lua_tostring(L, -1), LUA_EXEC_DIR, buff); lua_remove(L, -2); /* remove original string */ } } static void pusherror (lua_State *L) { int error = GetLastError(); char buffer[128]; if (FormatMessageA(FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_FROM_SYSTEM, NULL, error, 0, buffer, sizeof(buffer)/sizeof(char), NULL)) lua_pushstring(L, buffer); else lua_pushfstring(L, "system error %d\n", error); } static void ll_unloadlib (void *lib) { FreeLibrary((HMODULE)lib); } static void *ll_load (lua_State *L, const char *path, int seeglb) { HMODULE lib = LoadLibraryExA(path, NULL, LUA_LLE_FLAGS); (void)(seeglb); /* symbols are 'global' by default */ if (lib == NULL) pusherror(L); return lib; } static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) { lua_CFunction f = (lua_CFunction)GetProcAddress((HMODULE)lib, sym); if (f == NULL) pusherror(L); return f; } /* }====================================================== */ #else /* ** {====================================================== ** Fallback for other systems ** ======================================================= */ #undef LIB_FAIL #define LIB_FAIL "absent" #define DLMSG "dynamic libraries not enabled; check your Lua installation" static void ll_unloadlib (void *lib) { (void)(lib); /* to avoid warnings */ } static void *ll_load (lua_State *L, const char *path, int seeglb) { (void)(path); (void)(seeglb); /* to avoid warnings */ lua_pushliteral(L, DLMSG); return NULL; } static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) { (void)(lib); (void)(sym); /* to avoid warnings */ lua_pushliteral(L, DLMSG); return NULL; } /* }====================================================== */ #endif static void **ll_register (lua_State *L, const char *path) { void **plib; lua_pushfstring(L, "%s%s", LIBPREFIX, path); lua_gettable(L, LUA_REGISTRYINDEX); /* check library in registry? */ if (!lua_isnil(L, -1)) /* is there an entry? */ plib = (void **)lua_touserdata(L, -1); else { /* no entry yet; create one */ lua_pop(L, 1); /* remove result from gettable */ plib = (void **)lua_newuserdata(L, sizeof(const void *)); *plib = NULL; luaL_setmetatable(L, "_LOADLIB"); lua_pushfstring(L, "%s%s", LIBPREFIX, path); lua_pushvalue(L, -2); lua_settable(L, LUA_REGISTRYINDEX); } return plib; } /* ** __gc tag method: calls library's `ll_unloadlib' function with the lib ** handle */ static int gctm (lua_State *L) { void **lib = (void **)luaL_checkudata(L, 1, "_LOADLIB"); if (*lib) ll_unloadlib(*lib); *lib = NULL; /* mark library as closed */ return 0; } static int ll_loadfunc (lua_State *L, const char *path, const char *sym) { void **reg = ll_register(L, path); if (*reg == NULL) *reg = ll_load(L, path, *sym == '*'); if (*reg == NULL) return ERRLIB; /* unable to load library */ if (*sym == '*') { /* loading only library (no function)? */ lua_pushboolean(L, 1); /* return 'true' */ return 0; /* no errors */ } else { lua_CFunction f = ll_sym(L, *reg, sym); if (f == NULL) return ERRFUNC; /* unable to find function */ lua_pushcfunction(L, f); /* else create new function */ return 0; /* no errors */ } } static int ll_loadlib (lua_State *L) { const char *path = luaL_checkstring(L, 1); const char *init = luaL_checkstring(L, 2); int stat = ll_loadfunc(L, path, init); if (stat == 0) /* no errors? */ return 1; /* return the loaded function */ else { /* error; error message is on stack top */ lua_pushnil(L); lua_insert(L, -2); lua_pushstring(L, (stat == ERRLIB) ? LIB_FAIL : "init"); return 3; /* return nil, error message, and where */ } } /* ** {====================================================== ** 'require' function ** ======================================================= */ static int readable (const char *filename) { FILE *f = fopen(filename, "r"); /* try to open file */ if (f == NULL) return 0; /* open failed */ fclose(f); return 1; } static const char *pushnexttemplate (lua_State *L, const char *path) { const char *l; while (*path == *LUA_PATH_SEP) path++; /* skip separators */ if (*path == '\0') return NULL; /* no more templates */ l = strchr(path, *LUA_PATH_SEP); /* find next separator */ if (l == NULL) l = path + strlen(path); lua_pushlstring(L, path, l - path); /* template */ return l; } static const char *searchpath (lua_State *L, const char *name, const char *path, const char *sep) { if (*sep != '\0') /* non-empty separator? */ name = luaL_gsub(L, name, sep, LUA_DIRSEP); /* replace it by proper one */ lua_pushliteral(L, ""); /* error accumulator */ while ((path = pushnexttemplate(L, path)) != NULL) { const char *filename = luaL_gsub(L, lua_tostring(L, -1), LUA_PATH_MARK, name); lua_remove(L, -2); /* remove path template */ if (readable(filename)) /* does file exist and is readable? */ return filename; /* return that file name */ lua_pushfstring(L, "\n\tno file " LUA_QS, filename); lua_remove(L, -2); /* remove file name */ lua_concat(L, 2); /* add entry to possible error message */ } return NULL; /* not found */ } static int ll_searchpath (lua_State *L) { const char *f = searchpath(L, luaL_checkstring(L, 1), luaL_checkstring(L, 2), luaL_optstring(L, 3, ".")); if (f != NULL) return 1; else { /* error message is on top of the stack */ lua_pushnil(L); lua_insert(L, -2); return 2; /* return nil + error message */ } } static const char *findfile (lua_State *L, const char *name, const char *pname) { const char *path; lua_getfield(L, lua_upvalueindex(1), pname); path = lua_tostring(L, -1); if (path == NULL) luaL_error(L, LUA_QL("package.%s") " must be a string", pname); return searchpath(L, name, path, "."); } static int checkload (lua_State *L, int stat, const char *filename) { if (stat) { /* module loaded successfully? */ lua_pushstring(L, filename); /* will be 2nd argument to module */ return 2; /* return open function and file name */ } else return luaL_error(L, "error loading module " LUA_QS " from file " LUA_QS ":\n\t%s", lua_tostring(L, 1), filename, lua_tostring(L, -1)); } static int searcher_Lua (lua_State *L) { const char *filename; const char *name = luaL_checkstring(L, 1); filename = findfile(L, name, "path"); if (filename == NULL) return 1; /* module not found in this path */ return checkload(L, (luaL_loadfile(L, filename) == LUA_OK), filename); } static int loadfunc (lua_State *L, const char *filename, const char *modname) { const char *funcname; const char *mark; modname = luaL_gsub(L, modname, ".", LUA_OFSEP); mark = strchr(modname, *LUA_IGMARK); if (mark) { int stat; funcname = lua_pushlstring(L, modname, mark - modname); funcname = lua_pushfstring(L, POF"%s", funcname); stat = ll_loadfunc(L, filename, funcname); if (stat != ERRFUNC) return stat; modname = mark + 1; /* else go ahead and try old-style name */ } funcname = lua_pushfstring(L, POF"%s", modname); return ll_loadfunc(L, filename, funcname); } static int searcher_C (lua_State *L) { const char *name = luaL_checkstring(L, 1); const char *filename = findfile(L, name, "cpath"); if (filename == NULL) return 1; /* module not found in this path */ return checkload(L, (loadfunc(L, filename, name) == 0), filename); } static int searcher_Croot (lua_State *L) { const char *filename; const char *name = luaL_checkstring(L, 1); const char *p = strchr(name, '.'); int stat; if (p == NULL) return 0; /* is root */ lua_pushlstring(L, name, p - name); filename = findfile(L, lua_tostring(L, -1), "cpath"); if (filename == NULL) return 1; /* root not found */ if ((stat = loadfunc(L, filename, name)) != 0) { if (stat != ERRFUNC) return checkload(L, 0, filename); /* real error */ else { /* open function not found */ lua_pushfstring(L, "\n\tno module " LUA_QS " in file " LUA_QS, name, filename); return 1; } } lua_pushstring(L, filename); /* will be 2nd argument to module */ return 2; } static int searcher_preload (lua_State *L) { const char *name = luaL_checkstring(L, 1); lua_getfield(L, LUA_REGISTRYINDEX, "_PRELOAD"); lua_getfield(L, -1, name); if (lua_isnil(L, -1)) /* not found? */ lua_pushfstring(L, "\n\tno field package.preload['%s']", name); return 1; } static int ll_require (lua_State *L) { const char *name = luaL_checkstring(L, 1); int i; lua_settop(L, 1); /* _LOADED table will be at index 2 */ lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED"); lua_getfield(L, 2, name); if (lua_toboolean(L, -1)) /* is it there? */ return 1; /* package is already loaded */ /* else must load it; iterate over available seachers to find a loader */ lua_getfield(L, lua_upvalueindex(1), "searchers"); if (!lua_istable(L, -1)) luaL_error(L, LUA_QL("package.searchers") " must be a table"); lua_pushliteral(L, ""); /* error message accumulator */ for (i=1; ; i++) { lua_rawgeti(L, -2, i); /* get a seacher */ if (lua_isnil(L, -1)) /* no more searchers? */ luaL_error(L, "module " LUA_QS " not found:%s", name, lua_tostring(L, -2)); lua_pushstring(L, name); lua_call(L, 1, 2); /* call it */ if (lua_isfunction(L, -2)) /* did it find a loader? */ break; /* module loader found */ else if (lua_isstring(L, -2)) { /* searcher returned error message? */ lua_pop(L, 1); /* remove extra return */ lua_concat(L, 2); /* accumulate error message */ } else lua_pop(L, 2); /* remove both returns */ } lua_pushstring(L, name); /* pass name as argument to module loader */ lua_insert(L, -2); /* name is 1st argument (before search data) */ lua_call(L, 2, 1); /* run loader to load module */ if (!lua_isnil(L, -1)) /* non-nil return? */ lua_setfield(L, 2, name); /* _LOADED[name] = returned value */ lua_getfield(L, 2, name); if (lua_isnil(L, -1)) { /* module did not set a value? */ lua_pushboolean(L, 1); /* use true as result */ lua_pushvalue(L, -1); /* extra copy to be returned */ lua_setfield(L, 2, name); /* _LOADED[name] = true */ } return 1; } /* }====================================================== */ /* ** {====================================================== ** 'module' function ** ======================================================= */ #if defined(LUA_COMPAT_MODULE) /* ** changes the environment variable of calling function */ static void set_env (lua_State *L) { lua_Debug ar; if (lua_getstack(L, 1, &ar) == 0 || lua_getinfo(L, "f", &ar) == 0 || /* get calling function */ lua_iscfunction(L, -1)) luaL_error(L, LUA_QL("module") " not called from a Lua function"); lua_pushvalue(L, -2); /* copy new environment table to top */ lua_setupvalue(L, -2, 1); lua_pop(L, 1); /* remove function */ } static void dooptions (lua_State *L, int n) { int i; for (i = 2; i <= n; i++) { lua_pushvalue(L, i); /* get option (a function) */ lua_pushvalue(L, -2); /* module */ lua_call(L, 1, 0); } } static void modinit (lua_State *L, const char *modname) { const char *dot; lua_pushvalue(L, -1); lua_setfield(L, -2, "_M"); /* module._M = module */ lua_pushstring(L, modname); lua_setfield(L, -2, "_NAME"); dot = strrchr(modname, '.'); /* look for last dot in module name */ if (dot == NULL) dot = modname; else dot++; /* set _PACKAGE as package name (full module name minus last part) */ lua_pushlstring(L, modname, dot - modname); lua_setfield(L, -2, "_PACKAGE"); } static int ll_module (lua_State *L) { const char *modname = luaL_checkstring(L, 1); int lastarg = lua_gettop(L); /* last parameter */ luaL_pushmodule(L, modname, 1); /* get/create module table */ /* check whether table already has a _NAME field */ lua_getfield(L, -1, "_NAME"); if (!lua_isnil(L, -1)) /* is table an initialized module? */ lua_pop(L, 1); else { /* no; initialize it */ lua_pop(L, 1); modinit(L, modname); } lua_pushvalue(L, -1); set_env(L); dooptions(L, lastarg); return 1; } static int ll_seeall (lua_State *L) { luaL_checktype(L, 1, LUA_TTABLE); if (!lua_getmetatable(L, 1)) { lua_createtable(L, 0, 1); /* create new metatable */ lua_pushvalue(L, -1); lua_setmetatable(L, 1); } lua_pushglobaltable(L); lua_setfield(L, -2, "__index"); /* mt.__index = _G */ return 0; } #endif /* }====================================================== */ /* auxiliary mark (for internal use) */ #define AUXMARK "\1" static void setpath (lua_State *L, const char *fieldname, const char *envname1, const char *envname2, const char *def) { const char *path = getenv(envname1); if (path == NULL) /* no environment variable? */ path = getenv(envname2); /* try alternative name */ if (path == NULL) /* no environment variable? */ lua_pushstring(L, def); /* use default */ else { /* replace ";;" by ";AUXMARK;" and then AUXMARK by default path */ path = luaL_gsub(L, path, LUA_PATH_SEP LUA_PATH_SEP, LUA_PATH_SEP AUXMARK LUA_PATH_SEP); luaL_gsub(L, path, AUXMARK, def); lua_remove(L, -2); } setprogdir(L); lua_setfield(L, -2, fieldname); } static const luaL_Reg pk_funcs[] = { {"loadlib", ll_loadlib}, {"searchpath", ll_searchpath}, #if defined(LUA_COMPAT_MODULE) {"seeall", ll_seeall}, #endif {NULL, NULL} }; static const luaL_Reg ll_funcs[] = { #if defined(LUA_COMPAT_MODULE) {"module", ll_module}, #endif {"require", ll_require}, {NULL, NULL} }; static const lua_CFunction searchers[] = {searcher_preload, searcher_Lua, searcher_C, searcher_Croot, NULL}; LUAMOD_API int luaopen_package (lua_State *L) { int i; /* create new type _LOADLIB */ luaL_newmetatable(L, "_LOADLIB"); lua_pushcfunction(L, gctm); lua_setfield(L, -2, "__gc"); /* create `package' table */ luaL_newlib(L, pk_funcs); /* create 'searchers' table */ lua_createtable(L, sizeof(searchers)/sizeof(searchers[0]) - 1, 0); /* fill it with pre-defined searchers */ for (i=0; searchers[i] != NULL; i++) { lua_pushvalue(L, -2); /* set 'package' as upvalue for all searchers */ lua_pushcclosure(L, searchers[i], 1); lua_rawseti(L, -2, i+1); } #if defined(LUA_COMPAT_LOADERS) lua_pushvalue(L, -1); /* make a copy of 'searchers' table */ lua_setfield(L, -3, "loaders"); /* put it in field `loaders' */ #endif lua_setfield(L, -2, "searchers"); /* put it in field 'searchers' */ /* set field 'path' */ setpath(L, "path", LUA_PATHVERSION, LUA_PATH, LUA_PATH_DEFAULT); /* set field 'cpath' */ setpath(L, "cpath", LUA_CPATHVERSION, LUA_CPATH, LUA_CPATH_DEFAULT); /* store config information */ lua_pushliteral(L, LUA_DIRSEP "\n" LUA_PATH_SEP "\n" LUA_PATH_MARK "\n" LUA_EXEC_DIR "\n" LUA_IGMARK "\n"); lua_setfield(L, -2, "config"); /* set field `loaded' */ luaL_getsubtable(L, LUA_REGISTRYINDEX, "_LOADED"); lua_setfield(L, -2, "loaded"); /* set field `preload' */ luaL_getsubtable(L, LUA_REGISTRYINDEX, "_PRELOAD"); lua_setfield(L, -2, "preload"); lua_pushglobaltable(L); lua_pushvalue(L, -2); /* set 'package' as upvalue for next lib */ luaL_setfuncs(L, ll_funcs, 1); /* open lib into global table */ lua_pop(L, 1); /* pop global table */ return 1; /* return 'package' table */ }