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| 1 /* |
| 2 ** $Id: loadlib.c,v 1.111 2012/05/30 12:33:44 roberto Exp $ |
| 3 ** Dynamic library loader for Lua |
| 4 ** See Copyright Notice in lua.h |
| 5 ** |
| 6 ** This module contains an implementation of loadlib for Unix systems |
| 7 ** that have dlfcn, an implementation for Windows, and a stub for other |
| 8 ** systems. |
| 9 */ |
| 10 |
| 11 |
| 12 /* |
| 13 ** if needed, includes windows header before everything else |
| 14 */ |
| 15 #if defined(_WIN32) |
| 16 #include <windows.h> |
| 17 #endif |
| 18 |
| 19 |
| 20 #include <stdlib.h> |
| 21 #include <string.h> |
| 22 |
| 23 |
| 24 #define loadlib_c |
| 25 #define LUA_LIB |
| 26 |
| 27 #include "lua.h" |
| 28 |
| 29 #include "lauxlib.h" |
| 30 #include "lualib.h" |
| 31 |
| 32 |
| 33 /* |
| 34 ** LUA_PATH and LUA_CPATH are the names of the environment |
| 35 ** variables that Lua check to set its paths. |
| 36 */ |
| 37 #if !defined(LUA_PATH) |
| 38 #define LUA_PATH "LUA_PATH" |
| 39 #endif |
| 40 |
| 41 #if !defined(LUA_CPATH) |
| 42 #define LUA_CPATH "LUA_CPATH" |
| 43 #endif |
| 44 |
| 45 #define LUA_PATHSUFFIX "_" LUA_VERSION_MAJOR "_" LUA_VERSION_MINOR |
| 46 |
| 47 #define LUA_PATHVERSION LUA_PATH LUA_PATHSUFFIX |
| 48 #define LUA_CPATHVERSION LUA_CPATH LUA_PATHSUFFIX |
| 49 |
| 50 /* |
| 51 ** LUA_PATH_SEP is the character that separates templates in a path. |
| 52 ** LUA_PATH_MARK is the string that marks the substitution points in a |
| 53 ** template. |
| 54 ** LUA_EXEC_DIR in a Windows path is replaced by the executable's |
| 55 ** directory. |
| 56 ** LUA_IGMARK is a mark to ignore all before it when building the |
| 57 ** luaopen_ function name. |
| 58 */ |
| 59 #if !defined (LUA_PATH_SEP) |
| 60 #define LUA_PATH_SEP ";" |
| 61 #endif |
| 62 #if !defined (LUA_PATH_MARK) |
| 63 #define LUA_PATH_MARK "?" |
| 64 #endif |
| 65 #if !defined (LUA_EXEC_DIR) |
| 66 #define LUA_EXEC_DIR "!" |
| 67 #endif |
| 68 #if !defined (LUA_IGMARK) |
| 69 #define LUA_IGMARK "-" |
| 70 #endif |
| 71 |
| 72 |
| 73 /* |
| 74 ** LUA_CSUBSEP is the character that replaces dots in submodule names |
| 75 ** when searching for a C loader. |
| 76 ** LUA_LSUBSEP is the character that replaces dots in submodule names |
| 77 ** when searching for a Lua loader. |
| 78 */ |
| 79 #if !defined(LUA_CSUBSEP) |
| 80 #define LUA_CSUBSEP LUA_DIRSEP |
| 81 #endif |
| 82 |
| 83 #if !defined(LUA_LSUBSEP) |
| 84 #define LUA_LSUBSEP LUA_DIRSEP |
| 85 #endif |
| 86 |
| 87 |
| 88 /* prefix for open functions in C libraries */ |
| 89 #define LUA_POF "luaopen_" |
| 90 |
| 91 /* separator for open functions in C libraries */ |
| 92 #define LUA_OFSEP "_" |
| 93 |
| 94 |
| 95 /* table (in the registry) that keeps handles for all loaded C libraries */ |
| 96 #define CLIBS "_CLIBS" |
| 97 |
| 98 #define LIB_FAIL "open" |
| 99 |
| 100 |
| 101 /* error codes for ll_loadfunc */ |
| 102 #define ERRLIB 1 |
| 103 #define ERRFUNC 2 |
| 104 |
| 105 #define setprogdir(L) ((void)0) |
| 106 |
| 107 |
| 108 /* |
| 109 ** system-dependent functions |
| 110 */ |
| 111 static void ll_unloadlib (void *lib); |
| 112 static void *ll_load (lua_State *L, const char *path, int seeglb); |
| 113 static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym); |
| 114 |
| 115 |
| 116 |
| 117 #if defined(LUA_USE_DLOPEN) |
| 118 /* |
| 119 ** {======================================================================== |
| 120 ** This is an implementation of loadlib based on the dlfcn interface. |
| 121 ** The dlfcn interface is available in Linux, SunOS, Solaris, IRIX, FreeBSD, |
| 122 ** NetBSD, AIX 4.2, HPUX 11, and probably most other Unix flavors, at least |
| 123 ** as an emulation layer on top of native functions. |
| 124 ** ========================================================================= |
| 125 */ |
| 126 |
| 127 #include <dlfcn.h> |
| 128 |
| 129 static void ll_unloadlib (void *lib) { |
| 130 dlclose(lib); |
| 131 } |
| 132 |
| 133 |
| 134 static void *ll_load (lua_State *L, const char *path, int seeglb) { |
| 135 void *lib = dlopen(path, RTLD_NOW | (seeglb ? RTLD_GLOBAL : RTLD_LOCAL)); |
| 136 if (lib == NULL) lua_pushstring(L, dlerror()); |
| 137 return lib; |
| 138 } |
| 139 |
| 140 |
| 141 static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) { |
| 142 lua_CFunction f = (lua_CFunction)dlsym(lib, sym); |
| 143 if (f == NULL) lua_pushstring(L, dlerror()); |
| 144 return f; |
| 145 } |
| 146 |
| 147 /* }====================================================== */ |
| 148 |
| 149 |
| 150 |
| 151 #elif defined(LUA_DL_DLL) |
| 152 /* |
| 153 ** {====================================================================== |
| 154 ** This is an implementation of loadlib for Windows using native functions. |
| 155 ** ======================================================================= |
| 156 */ |
| 157 |
| 158 #undef setprogdir |
| 159 |
| 160 /* |
| 161 ** optional flags for LoadLibraryEx |
| 162 */ |
| 163 #if !defined(LUA_LLE_FLAGS) |
| 164 #define LUA_LLE_FLAGS 0 |
| 165 #endif |
| 166 |
| 167 |
| 168 static void setprogdir (lua_State *L) { |
| 169 char buff[MAX_PATH + 1]; |
| 170 char *lb; |
| 171 DWORD nsize = sizeof(buff)/sizeof(char); |
| 172 DWORD n = GetModuleFileNameA(NULL, buff, nsize); |
| 173 if (n == 0 || n == nsize || (lb = strrchr(buff, '\\')) == NULL) |
| 174 luaL_error(L, "unable to get ModuleFileName"); |
| 175 else { |
| 176 *lb = '\0'; |
| 177 luaL_gsub(L, lua_tostring(L, -1), LUA_EXEC_DIR, buff); |
| 178 lua_remove(L, -2); /* remove original string */ |
| 179 } |
| 180 } |
| 181 |
| 182 |
| 183 static void pusherror (lua_State *L) { |
| 184 int error = GetLastError(); |
| 185 char buffer[128]; |
| 186 if (FormatMessageA(FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_FROM_SYSTEM, |
| 187 NULL, error, 0, buffer, sizeof(buffer)/sizeof(char), NULL)) |
| 188 lua_pushstring(L, buffer); |
| 189 else |
| 190 lua_pushfstring(L, "system error %d\n", error); |
| 191 } |
| 192 |
| 193 static void ll_unloadlib (void *lib) { |
| 194 FreeLibrary((HMODULE)lib); |
| 195 } |
| 196 |
| 197 |
| 198 static void *ll_load (lua_State *L, const char *path, int seeglb) { |
| 199 HMODULE lib = LoadLibraryExA(path, NULL, LUA_LLE_FLAGS); |
| 200 (void)(seeglb); /* not used: symbols are 'global' by default */ |
| 201 if (lib == NULL) pusherror(L); |
| 202 return lib; |
| 203 } |
| 204 |
| 205 |
| 206 static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) { |
| 207 lua_CFunction f = (lua_CFunction)GetProcAddress((HMODULE)lib, sym); |
| 208 if (f == NULL) pusherror(L); |
| 209 return f; |
| 210 } |
| 211 |
| 212 /* }====================================================== */ |
| 213 |
| 214 |
| 215 #else |
| 216 /* |
| 217 ** {====================================================== |
| 218 ** Fallback for other systems |
| 219 ** ======================================================= |
| 220 */ |
| 221 |
| 222 #undef LIB_FAIL |
| 223 #define LIB_FAIL "absent" |
| 224 |
| 225 |
| 226 #define DLMSG "dynamic libraries not enabled; check your Lua installation" |
| 227 |
| 228 |
| 229 static void ll_unloadlib (void *lib) { |
| 230 (void)(lib); /* not used */ |
| 231 } |
| 232 |
| 233 |
| 234 static void *ll_load (lua_State *L, const char *path, int seeglb) { |
| 235 (void)(path); (void)(seeglb); /* not used */ |
| 236 lua_pushliteral(L, DLMSG); |
| 237 return NULL; |
| 238 } |
| 239 |
| 240 |
| 241 static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) { |
| 242 (void)(lib); (void)(sym); /* not used */ |
| 243 lua_pushliteral(L, DLMSG); |
| 244 return NULL; |
| 245 } |
| 246 |
| 247 /* }====================================================== */ |
| 248 #endif |
| 249 |
| 250 |
| 251 static void *ll_checkclib (lua_State *L, const char *path) { |
| 252 void *plib; |
| 253 lua_getfield(L, LUA_REGISTRYINDEX, CLIBS); |
| 254 lua_getfield(L, -1, path); |
| 255 plib = lua_touserdata(L, -1); /* plib = CLIBS[path] */ |
| 256 lua_pop(L, 2); /* pop CLIBS table and 'plib' */ |
| 257 return plib; |
| 258 } |
| 259 |
| 260 |
| 261 static void ll_addtoclib (lua_State *L, const char *path, void *plib) { |
| 262 lua_getfield(L, LUA_REGISTRYINDEX, CLIBS); |
| 263 lua_pushlightuserdata(L, plib); |
| 264 lua_pushvalue(L, -1); |
| 265 lua_setfield(L, -3, path); /* CLIBS[path] = plib */ |
| 266 lua_rawseti(L, -2, luaL_len(L, -2) + 1); /* CLIBS[#CLIBS + 1] = plib */ |
| 267 lua_pop(L, 1); /* pop CLIBS table */ |
| 268 } |
| 269 |
| 270 |
| 271 /* |
| 272 ** __gc tag method for CLIBS table: calls 'll_unloadlib' for all lib |
| 273 ** handles in list CLIBS |
| 274 */ |
| 275 static int gctm (lua_State *L) { |
| 276 int n = luaL_len(L, 1); |
| 277 for (; n >= 1; n--) { /* for each handle, in reverse order */ |
| 278 lua_rawgeti(L, 1, n); /* get handle CLIBS[n] */ |
| 279 ll_unloadlib(lua_touserdata(L, -1)); |
| 280 lua_pop(L, 1); /* pop handle */ |
| 281 } |
| 282 return 0; |
| 283 } |
| 284 |
| 285 |
| 286 static int ll_loadfunc (lua_State *L, const char *path, const char *sym) { |
| 287 void *reg = ll_checkclib(L, path); /* check loaded C libraries */ |
| 288 if (reg == NULL) { /* must load library? */ |
| 289 reg = ll_load(L, path, *sym == '*'); |
| 290 if (reg == NULL) return ERRLIB; /* unable to load library */ |
| 291 ll_addtoclib(L, path, reg); |
| 292 } |
| 293 if (*sym == '*') { /* loading only library (no function)? */ |
| 294 lua_pushboolean(L, 1); /* return 'true' */ |
| 295 return 0; /* no errors */ |
| 296 } |
| 297 else { |
| 298 lua_CFunction f = ll_sym(L, reg, sym); |
| 299 if (f == NULL) |
| 300 return ERRFUNC; /* unable to find function */ |
| 301 lua_pushcfunction(L, f); /* else create new function */ |
| 302 return 0; /* no errors */ |
| 303 } |
| 304 } |
| 305 |
| 306 |
| 307 static int ll_loadlib (lua_State *L) { |
| 308 const char *path = luaL_checkstring(L, 1); |
| 309 const char *init = luaL_checkstring(L, 2); |
| 310 int stat = ll_loadfunc(L, path, init); |
| 311 if (stat == 0) /* no errors? */ |
| 312 return 1; /* return the loaded function */ |
| 313 else { /* error; error message is on stack top */ |
| 314 lua_pushnil(L); |
| 315 lua_insert(L, -2); |
| 316 lua_pushstring(L, (stat == ERRLIB) ? LIB_FAIL : "init"); |
| 317 return 3; /* return nil, error message, and where */ |
| 318 } |
| 319 } |
| 320 |
| 321 |
| 322 |
| 323 /* |
| 324 ** {====================================================== |
| 325 ** 'require' function |
| 326 ** ======================================================= |
| 327 */ |
| 328 |
| 329 |
| 330 static int readable (const char *filename) { |
| 331 FILE *f = fopen(filename, "r"); /* try to open file */ |
| 332 if (f == NULL) return 0; /* open failed */ |
| 333 fclose(f); |
| 334 return 1; |
| 335 } |
| 336 |
| 337 |
| 338 static const char *pushnexttemplate (lua_State *L, const char *path) { |
| 339 const char *l; |
| 340 while (*path == *LUA_PATH_SEP) path++; /* skip separators */ |
| 341 if (*path == '\0') return NULL; /* no more templates */ |
| 342 l = strchr(path, *LUA_PATH_SEP); /* find next separator */ |
| 343 if (l == NULL) l = path + strlen(path); |
| 344 lua_pushlstring(L, path, l - path); /* template */ |
| 345 return l; |
| 346 } |
| 347 |
| 348 |
| 349 static const char *searchpath (lua_State *L, const char *name, |
| 350 const char *path, |
| 351 const char *sep, |
| 352 const char *dirsep) { |
| 353 luaL_Buffer msg; /* to build error message */ |
| 354 luaL_buffinit(L, &msg); |
| 355 if (*sep != '\0') /* non-empty separator? */ |
| 356 name = luaL_gsub(L, name, sep, dirsep); /* replace it by 'dirsep' */ |
| 357 while ((path = pushnexttemplate(L, path)) != NULL) { |
| 358 const char *filename = luaL_gsub(L, lua_tostring(L, -1), |
| 359 LUA_PATH_MARK, name); |
| 360 lua_remove(L, -2); /* remove path template */ |
| 361 if (readable(filename)) /* does file exist and is readable? */ |
| 362 return filename; /* return that file name */ |
| 363 lua_pushfstring(L, "\n\tno file " LUA_QS, filename); |
| 364 lua_remove(L, -2); /* remove file name */ |
| 365 luaL_addvalue(&msg); /* concatenate error msg. entry */ |
| 366 } |
| 367 luaL_pushresult(&msg); /* create error message */ |
| 368 return NULL; /* not found */ |
| 369 } |
| 370 |
| 371 |
| 372 static int ll_searchpath (lua_State *L) { |
| 373 const char *f = searchpath(L, luaL_checkstring(L, 1), |
| 374 luaL_checkstring(L, 2), |
| 375 luaL_optstring(L, 3, "."), |
| 376 luaL_optstring(L, 4, LUA_DIRSEP)); |
| 377 if (f != NULL) return 1; |
| 378 else { /* error message is on top of the stack */ |
| 379 lua_pushnil(L); |
| 380 lua_insert(L, -2); |
| 381 return 2; /* return nil + error message */ |
| 382 } |
| 383 } |
| 384 |
| 385 |
| 386 static const char *findfile (lua_State *L, const char *name, |
| 387 const char *pname, |
| 388 const char *dirsep) { |
| 389 const char *path; |
| 390 lua_getfield(L, lua_upvalueindex(1), pname); |
| 391 path = lua_tostring(L, -1); |
| 392 if (path == NULL) |
| 393 luaL_error(L, LUA_QL("package.%s") " must be a string", pname); |
| 394 return searchpath(L, name, path, ".", dirsep); |
| 395 } |
| 396 |
| 397 |
| 398 static int checkload (lua_State *L, int stat, const char *filename) { |
| 399 if (stat) { /* module loaded successfully? */ |
| 400 lua_pushstring(L, filename); /* will be 2nd argument to module */ |
| 401 return 2; /* return open function and file name */ |
| 402 } |
| 403 else |
| 404 return luaL_error(L, "error loading module " LUA_QS |
| 405 " from file " LUA_QS ":\n\t%s", |
| 406 lua_tostring(L, 1), filename, lua_tostring(L, -1)); |
| 407 } |
| 408 |
| 409 |
| 410 static int searcher_Lua (lua_State *L) { |
| 411 const char *filename; |
| 412 const char *name = luaL_checkstring(L, 1); |
| 413 filename = findfile(L, name, "path", LUA_LSUBSEP); |
| 414 if (filename == NULL) return 1; /* module not found in this path */ |
| 415 return checkload(L, (luaL_loadfile(L, filename) == LUA_OK), filename); |
| 416 } |
| 417 |
| 418 |
| 419 static int loadfunc (lua_State *L, const char *filename, const char *modname) { |
| 420 const char *funcname; |
| 421 const char *mark; |
| 422 modname = luaL_gsub(L, modname, ".", LUA_OFSEP); |
| 423 mark = strchr(modname, *LUA_IGMARK); |
| 424 if (mark) { |
| 425 int stat; |
| 426 funcname = lua_pushlstring(L, modname, mark - modname); |
| 427 funcname = lua_pushfstring(L, LUA_POF"%s", funcname); |
| 428 stat = ll_loadfunc(L, filename, funcname); |
| 429 if (stat != ERRFUNC) return stat; |
| 430 modname = mark + 1; /* else go ahead and try old-style name */ |
| 431 } |
| 432 funcname = lua_pushfstring(L, LUA_POF"%s", modname); |
| 433 return ll_loadfunc(L, filename, funcname); |
| 434 } |
| 435 |
| 436 |
| 437 static int searcher_C (lua_State *L) { |
| 438 const char *name = luaL_checkstring(L, 1); |
| 439 const char *filename = findfile(L, name, "cpath", LUA_CSUBSEP); |
| 440 if (filename == NULL) return 1; /* module not found in this path */ |
| 441 return checkload(L, (loadfunc(L, filename, name) == 0), filename); |
| 442 } |
| 443 |
| 444 |
| 445 static int searcher_Croot (lua_State *L) { |
| 446 const char *filename; |
| 447 const char *name = luaL_checkstring(L, 1); |
| 448 const char *p = strchr(name, '.'); |
| 449 int stat; |
| 450 if (p == NULL) return 0; /* is root */ |
| 451 lua_pushlstring(L, name, p - name); |
| 452 filename = findfile(L, lua_tostring(L, -1), "cpath", LUA_CSUBSEP); |
| 453 if (filename == NULL) return 1; /* root not found */ |
| 454 if ((stat = loadfunc(L, filename, name)) != 0) { |
| 455 if (stat != ERRFUNC) |
| 456 return checkload(L, 0, filename); /* real error */ |
| 457 else { /* open function not found */ |
| 458 lua_pushfstring(L, "\n\tno module " LUA_QS " in file " LUA_QS, |
| 459 name, filename); |
| 460 return 1; |
| 461 } |
| 462 } |
| 463 lua_pushstring(L, filename); /* will be 2nd argument to module */ |
| 464 return 2; |
| 465 } |
| 466 |
| 467 |
| 468 static int searcher_preload (lua_State *L) { |
| 469 const char *name = luaL_checkstring(L, 1); |
| 470 lua_getfield(L, LUA_REGISTRYINDEX, "_PRELOAD"); |
| 471 lua_getfield(L, -1, name); |
| 472 if (lua_isnil(L, -1)) /* not found? */ |
| 473 lua_pushfstring(L, "\n\tno field package.preload['%s']", name); |
| 474 return 1; |
| 475 } |
| 476 |
| 477 |
| 478 static void findloader (lua_State *L, const char *name) { |
| 479 int i; |
| 480 luaL_Buffer msg; /* to build error message */ |
| 481 luaL_buffinit(L, &msg); |
| 482 lua_getfield(L, lua_upvalueindex(1), "searchers"); /* will be at index 3 */ |
| 483 if (!lua_istable(L, 3)) |
| 484 luaL_error(L, LUA_QL("package.searchers") " must be a table"); |
| 485 /* iterate over available searchers to find a loader */ |
| 486 for (i = 1; ; i++) { |
| 487 lua_rawgeti(L, 3, i); /* get a searcher */ |
| 488 if (lua_isnil(L, -1)) { /* no more searchers? */ |
| 489 lua_pop(L, 1); /* remove nil */ |
| 490 luaL_pushresult(&msg); /* create error message */ |
| 491 luaL_error(L, "module " LUA_QS " not found:%s", |
| 492 name, lua_tostring(L, -1)); |
| 493 } |
| 494 lua_pushstring(L, name); |
| 495 lua_call(L, 1, 2); /* call it */ |
| 496 if (lua_isfunction(L, -2)) /* did it find a loader? */ |
| 497 return; /* module loader found */ |
| 498 else if (lua_isstring(L, -2)) { /* searcher returned error message? */ |
| 499 lua_pop(L, 1); /* remove extra return */ |
| 500 luaL_addvalue(&msg); /* concatenate error message */ |
| 501 } |
| 502 else |
| 503 lua_pop(L, 2); /* remove both returns */ |
| 504 } |
| 505 } |
| 506 |
| 507 |
| 508 static int ll_require (lua_State *L) { |
| 509 const char *name = luaL_checkstring(L, 1); |
| 510 lua_settop(L, 1); /* _LOADED table will be at index 2 */ |
| 511 lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED"); |
| 512 lua_getfield(L, 2, name); /* _LOADED[name] */ |
| 513 if (lua_toboolean(L, -1)) /* is it there? */ |
| 514 return 1; /* package is already loaded */ |
| 515 /* else must load package */ |
| 516 lua_pop(L, 1); /* remove 'getfield' result */ |
| 517 findloader(L, name); |
| 518 lua_pushstring(L, name); /* pass name as argument to module loader */ |
| 519 lua_insert(L, -2); /* name is 1st argument (before search data) */ |
| 520 lua_call(L, 2, 1); /* run loader to load module */ |
| 521 if (!lua_isnil(L, -1)) /* non-nil return? */ |
| 522 lua_setfield(L, 2, name); /* _LOADED[name] = returned value */ |
| 523 lua_getfield(L, 2, name); |
| 524 if (lua_isnil(L, -1)) { /* module did not set a value? */ |
| 525 lua_pushboolean(L, 1); /* use true as result */ |
| 526 lua_pushvalue(L, -1); /* extra copy to be returned */ |
| 527 lua_setfield(L, 2, name); /* _LOADED[name] = true */ |
| 528 } |
| 529 return 1; |
| 530 } |
| 531 |
| 532 /* }====================================================== */ |
| 533 |
| 534 |
| 535 |
| 536 /* |
| 537 ** {====================================================== |
| 538 ** 'module' function |
| 539 ** ======================================================= |
| 540 */ |
| 541 #if defined(LUA_COMPAT_MODULE) |
| 542 |
| 543 /* |
| 544 ** changes the environment variable of calling function |
| 545 */ |
| 546 static void set_env (lua_State *L) { |
| 547 lua_Debug ar; |
| 548 if (lua_getstack(L, 1, &ar) == 0 || |
| 549 lua_getinfo(L, "f", &ar) == 0 || /* get calling function */ |
| 550 lua_iscfunction(L, -1)) |
| 551 luaL_error(L, LUA_QL("module") " not called from a Lua function"); |
| 552 lua_pushvalue(L, -2); /* copy new environment table to top */ |
| 553 lua_setupvalue(L, -2, 1); |
| 554 lua_pop(L, 1); /* remove function */ |
| 555 } |
| 556 |
| 557 |
| 558 static void dooptions (lua_State *L, int n) { |
| 559 int i; |
| 560 for (i = 2; i <= n; i++) { |
| 561 if (lua_isfunction(L, i)) { /* avoid 'calling' extra info. */ |
| 562 lua_pushvalue(L, i); /* get option (a function) */ |
| 563 lua_pushvalue(L, -2); /* module */ |
| 564 lua_call(L, 1, 0); |
| 565 } |
| 566 } |
| 567 } |
| 568 |
| 569 |
| 570 static void modinit (lua_State *L, const char *modname) { |
| 571 const char *dot; |
| 572 lua_pushvalue(L, -1); |
| 573 lua_setfield(L, -2, "_M"); /* module._M = module */ |
| 574 lua_pushstring(L, modname); |
| 575 lua_setfield(L, -2, "_NAME"); |
| 576 dot = strrchr(modname, '.'); /* look for last dot in module name */ |
| 577 if (dot == NULL) dot = modname; |
| 578 else dot++; |
| 579 /* set _PACKAGE as package name (full module name minus last part) */ |
| 580 lua_pushlstring(L, modname, dot - modname); |
| 581 lua_setfield(L, -2, "_PACKAGE"); |
| 582 } |
| 583 |
| 584 |
| 585 static int ll_module (lua_State *L) { |
| 586 const char *modname = luaL_checkstring(L, 1); |
| 587 int lastarg = lua_gettop(L); /* last parameter */ |
| 588 luaL_pushmodule(L, modname, 1); /* get/create module table */ |
| 589 /* check whether table already has a _NAME field */ |
| 590 lua_getfield(L, -1, "_NAME"); |
| 591 if (!lua_isnil(L, -1)) /* is table an initialized module? */ |
| 592 lua_pop(L, 1); |
| 593 else { /* no; initialize it */ |
| 594 lua_pop(L, 1); |
| 595 modinit(L, modname); |
| 596 } |
| 597 lua_pushvalue(L, -1); |
| 598 set_env(L); |
| 599 dooptions(L, lastarg); |
| 600 return 1; |
| 601 } |
| 602 |
| 603 |
| 604 static int ll_seeall (lua_State *L) { |
| 605 luaL_checktype(L, 1, LUA_TTABLE); |
| 606 if (!lua_getmetatable(L, 1)) { |
| 607 lua_createtable(L, 0, 1); /* create new metatable */ |
| 608 lua_pushvalue(L, -1); |
| 609 lua_setmetatable(L, 1); |
| 610 } |
| 611 lua_pushglobaltable(L); |
| 612 lua_setfield(L, -2, "__index"); /* mt.__index = _G */ |
| 613 return 0; |
| 614 } |
| 615 |
| 616 #endif |
| 617 /* }====================================================== */ |
| 618 |
| 619 |
| 620 |
| 621 /* auxiliary mark (for internal use) */ |
| 622 #define AUXMARK "\1" |
| 623 |
| 624 |
| 625 /* |
| 626 ** return registry.LUA_NOENV as a boolean |
| 627 */ |
| 628 static int noenv (lua_State *L) { |
| 629 int b; |
| 630 lua_getfield(L, LUA_REGISTRYINDEX, "LUA_NOENV"); |
| 631 b = lua_toboolean(L, -1); |
| 632 lua_pop(L, 1); /* remove value */ |
| 633 return b; |
| 634 } |
| 635 |
| 636 |
| 637 static void setpath (lua_State *L, const char *fieldname, const char *envname1, |
| 638 const char *envname2, const char *def) { |
| 639 const char *path = getenv(envname1); |
| 640 if (path == NULL) /* no environment variable? */ |
| 641 path = getenv(envname2); /* try alternative name */ |
| 642 if (path == NULL || noenv(L)) /* no environment variable? */ |
| 643 lua_pushstring(L, def); /* use default */ |
| 644 else { |
| 645 /* replace ";;" by ";AUXMARK;" and then AUXMARK by default path */ |
| 646 path = luaL_gsub(L, path, LUA_PATH_SEP LUA_PATH_SEP, |
| 647 LUA_PATH_SEP AUXMARK LUA_PATH_SEP); |
| 648 luaL_gsub(L, path, AUXMARK, def); |
| 649 lua_remove(L, -2); |
| 650 } |
| 651 setprogdir(L); |
| 652 lua_setfield(L, -2, fieldname); |
| 653 } |
| 654 |
| 655 |
| 656 static const luaL_Reg pk_funcs[] = { |
| 657 {"loadlib", ll_loadlib}, |
| 658 {"searchpath", ll_searchpath}, |
| 659 #if defined(LUA_COMPAT_MODULE) |
| 660 {"seeall", ll_seeall}, |
| 661 #endif |
| 662 {NULL, NULL} |
| 663 }; |
| 664 |
| 665 |
| 666 static const luaL_Reg ll_funcs[] = { |
| 667 #if defined(LUA_COMPAT_MODULE) |
| 668 {"module", ll_module}, |
| 669 #endif |
| 670 {"require", ll_require}, |
| 671 {NULL, NULL} |
| 672 }; |
| 673 |
| 674 |
| 675 static void createsearcherstable (lua_State *L) { |
| 676 static const lua_CFunction searchers[] = |
| 677 {searcher_preload, searcher_Lua, searcher_C, searcher_Croot, NULL}; |
| 678 int i; |
| 679 /* create 'searchers' table */ |
| 680 lua_createtable(L, sizeof(searchers)/sizeof(searchers[0]) - 1, 0); |
| 681 /* fill it with pre-defined searchers */ |
| 682 for (i=0; searchers[i] != NULL; i++) { |
| 683 lua_pushvalue(L, -2); /* set 'package' as upvalue for all searchers */ |
| 684 lua_pushcclosure(L, searchers[i], 1); |
| 685 lua_rawseti(L, -2, i+1); |
| 686 } |
| 687 } |
| 688 |
| 689 |
| 690 LUAMOD_API int luaopen_package (lua_State *L) { |
| 691 /* create table CLIBS to keep track of loaded C libraries */ |
| 692 luaL_getsubtable(L, LUA_REGISTRYINDEX, CLIBS); |
| 693 lua_createtable(L, 0, 1); /* metatable for CLIBS */ |
| 694 lua_pushcfunction(L, gctm); |
| 695 lua_setfield(L, -2, "__gc"); /* set finalizer for CLIBS table */ |
| 696 lua_setmetatable(L, -2); |
| 697 /* create `package' table */ |
| 698 luaL_newlib(L, pk_funcs); |
| 699 createsearcherstable(L); |
| 700 #if defined(LUA_COMPAT_LOADERS) |
| 701 lua_pushvalue(L, -1); /* make a copy of 'searchers' table */ |
| 702 lua_setfield(L, -3, "loaders"); /* put it in field `loaders' */ |
| 703 #endif |
| 704 lua_setfield(L, -2, "searchers"); /* put it in field 'searchers' */ |
| 705 /* set field 'path' */ |
| 706 setpath(L, "path", LUA_PATHVERSION, LUA_PATH, LUA_PATH_DEFAULT); |
| 707 /* set field 'cpath' */ |
| 708 setpath(L, "cpath", LUA_CPATHVERSION, LUA_CPATH, LUA_CPATH_DEFAULT); |
| 709 /* store config information */ |
| 710 lua_pushliteral(L, LUA_DIRSEP "\n" LUA_PATH_SEP "\n" LUA_PATH_MARK "\n" |
| 711 LUA_EXEC_DIR "\n" LUA_IGMARK "\n"); |
| 712 lua_setfield(L, -2, "config"); |
| 713 /* set field `loaded' */ |
| 714 luaL_getsubtable(L, LUA_REGISTRYINDEX, "_LOADED"); |
| 715 lua_setfield(L, -2, "loaded"); |
| 716 /* set field `preload' */ |
| 717 luaL_getsubtable(L, LUA_REGISTRYINDEX, "_PRELOAD"); |
| 718 lua_setfield(L, -2, "preload"); |
| 719 lua_pushglobaltable(L); |
| 720 lua_pushvalue(L, -2); /* set 'package' as upvalue for next lib */ |
| 721 luaL_setfuncs(L, ll_funcs, 1); /* open lib into global table */ |
| 722 lua_pop(L, 1); /* pop global table */ |
| 723 return 1; /* return 'package' table */ |
| 724 } |
| 725 |
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