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comparison lib/lua/lua-5.2.2/loadlib.c @ 1866:41cc4dd3c122

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Lua 5.2.2 added.
author Nomad
date Wed, 16 Oct 2013 13:34:26 +0200
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1848:3b39b70e8e93 1866:41cc4dd3c122
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