1/*
2** $Id: loadlib.c $
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#define loadlib_c
12#define LUA_LIB
13
14#include "lprefix.h"
15
16
17#include <stdio.h>
18#include <stdlib.h>
19#include <string.h>
20
21#include "lua.h"
22
23#include "lauxlib.h"
24#include "lualib.h"
25
26
27/*
28** LUA_IGMARK is a mark to ignore all before it when building the
29** luaopen_ function name.
30*/
31#if !defined (LUA_IGMARK)
32#define LUA_IGMARK "-"
33#endif
34
35
36/*
37** LUA_CSUBSEP is the character that replaces dots in submodule names
38** when searching for a C loader.
39** LUA_LSUBSEP is the character that replaces dots in submodule names
40** when searching for a Lua loader.
41*/
42#if !defined(LUA_CSUBSEP)
43#define LUA_CSUBSEP LUA_DIRSEP
44#endif
45
46#if !defined(LUA_LSUBSEP)
47#define LUA_LSUBSEP LUA_DIRSEP
48#endif
49
50
51/* prefix for open functions in C libraries */
52#define LUA_POF "luaopen_"
53
54/* separator for open functions in C libraries */
55#define LUA_OFSEP "_"
56
57
58/*
59** key for table in the registry that keeps handles
60** for all loaded C libraries
61*/
62static const char *const CLIBS = "_CLIBS";
63
64#define LIB_FAIL "open"
65
66
67#define setprogdir(L) ((void)0)
68
69
70/*
71** Special type equivalent to '(void*)' for functions in gcc
72** (to suppress warnings when converting function pointers)
73*/
74typedef void (*voidf)(void);
75
76
77/*
78** system-dependent functions
79*/
80
81/*
82** unload library 'lib'
83*/
84static void lsys_unloadlib (void *lib);
85
86/*
87** load C library in file 'path'. If 'seeglb', load with all names in
88** the library global.
89** Returns the library; in case of error, returns NULL plus an
90** error string in the stack.
91*/
92static void *lsys_load (lua_State *L, const char *path, int seeglb);
93
94/*
95** Try to find a function named 'sym' in library 'lib'.
96** Returns the function; in case of error, returns NULL plus an
97** error string in the stack.
98*/
99static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym);
100
101
102
103
104#if defined(LUA_USE_DLOPEN) /* { */
105/*
106** {========================================================================
107** This is an implementation of loadlib based on the dlfcn interface.
108** The dlfcn interface is available in Linux, SunOS, Solaris, IRIX, FreeBSD,
109** NetBSD, AIX 4.2, HPUX 11, and probably most other Unix flavors, at least
110** as an emulation layer on top of native functions.
111** =========================================================================
112*/
113
114#include <dlfcn.h>
115
116/*
117** Macro to convert pointer-to-void* to pointer-to-function. This cast
118** is undefined according to ISO C, but POSIX assumes that it works.
119** (The '__extension__' in gnu compilers is only to avoid warnings.)
120*/
121#if defined(__GNUC__)
122#define cast_func(p) (__extension__ (lua_CFunction)(p))
123#else
124#define cast_func(p) ((lua_CFunction)(p))
125#endif
126
127
128static void lsys_unloadlib (void *lib) {
129 dlclose(lib);
130}
131
132
133static void *lsys_load (lua_State *L, const char *path, int seeglb) {
134 void *lib = dlopen(path, RTLD_NOW | (seeglb ? RTLD_GLOBAL : RTLD_LOCAL));
135 if (lib == NULL) lua_pushstring(L, dlerror());
136 return lib;
137}
138
139
140static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym) {
141 lua_CFunction f = cast_func(dlsym(lib, sym));
142 if (f == NULL) lua_pushstring(L, dlerror());
143 return f;
144}
145
146/* }====================================================== */
147
148
149
150#elif defined(LUA_DL_DLL) /* }{ */
151/*
152** {======================================================================
153** This is an implementation of loadlib for Windows using native functions.
154** =======================================================================
155*/
156
157#include <windows.h>
158
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#undef setprogdir
169
170
171/*
172** Replace in the path (on the top of the stack) any occurrence
173** of LUA_EXEC_DIR with the executable's path.
174*/
175static void setprogdir (lua_State *L) {
176 char buff[MAX_PATH + 1];
177 char *lb;
178 DWORD nsize = sizeof(buff)/sizeof(char);
179 DWORD n = GetModuleFileNameA(NULL, buff, nsize); /* get exec. name */
180 if (n == 0 || n == nsize || (lb = strrchr(buff, '\\')) == NULL)
181 luaL_error(L, "unable to get ModuleFileName");
182 else {
183 *lb = '\0'; /* cut name on the last '\\' to get the path */
184 luaL_gsub(L, lua_tostring(L, -1), LUA_EXEC_DIR, buff);
185 lua_remove(L, -2); /* remove original string */
186 }
187}
188
189
190
191
192static void pusherror (lua_State *L) {
193 int error = GetLastError();
194 char buffer[128];
195 if (FormatMessageA(FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_FROM_SYSTEM,
196 NULL, error, 0, buffer, sizeof(buffer)/sizeof(char), NULL))
197 lua_pushstring(L, buffer);
198 else
199 lua_pushfstring(L, "system error %d\n", error);
200}
201
202static void lsys_unloadlib (void *lib) {
203 FreeLibrary((HMODULE)lib);
204}
205
206
207static void *lsys_load (lua_State *L, const char *path, int seeglb) {
208 HMODULE lib = LoadLibraryExA(path, NULL, LUA_LLE_FLAGS);
209 (void)(seeglb); /* not used: symbols are 'global' by default */
210 if (lib == NULL) pusherror(L);
211 return lib;
212}
213
214
215static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym) {
216 lua_CFunction f = (lua_CFunction)(voidf)GetProcAddress((HMODULE)lib, sym);
217 if (f == NULL) pusherror(L);
218 return f;
219}
220
221/* }====================================================== */
222
223
224#else /* }{ */
225/*
226** {======================================================
227** Fallback for other systems
228** =======================================================
229*/
230
231#undef LIB_FAIL
232#define LIB_FAIL "absent"
233
234
235#define DLMSG "dynamic libraries not enabled; check your Lua installation"
236
237
238static void lsys_unloadlib (void *lib) {
239 (void)(lib); /* not used */
240}
241
242
243static void *lsys_load (lua_State *L, const char *path, int seeglb) {
244 (void)(path); (void)(seeglb); /* not used */
245 lua_pushliteral(L, DLMSG);
246 return NULL;
247}
248
249
250static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym) {
251 (void)(lib); (void)(sym); /* not used */
252 lua_pushliteral(L, DLMSG);
253 return NULL;
254}
255
256/* }====================================================== */
257#endif /* } */
258
259
260/*
261** {==================================================================
262** Set Paths
263** ===================================================================
264*/
265
266/*
267** LUA_PATH_VAR and LUA_CPATH_VAR are the names of the environment
268** variables that Lua check to set its paths.
269*/
270#if !defined(LUA_PATH_VAR)
271#define LUA_PATH_VAR "LUA_PATH"
272#endif
273
274#if !defined(LUA_CPATH_VAR)
275#define LUA_CPATH_VAR "LUA_CPATH"
276#endif
277
278
279
280/*
281** return registry.LUA_NOENV as a boolean
282*/
283static int noenv (lua_State *L) {
284 int b;
285 lua_getfield(L, LUA_REGISTRYINDEX, "LUA_NOENV");
286 b = lua_toboolean(L, -1);
287 lua_pop(L, 1); /* remove value */
288 return b;
289}
290
291
292/*
293** Set a path
294*/
295static void setpath (lua_State *L, const char *fieldname,
296 const char *envname,
297 const char *dft) {
298 const char *dftmark;
299 const char *nver = lua_pushfstring(L, "%s%s", envname, LUA_VERSUFFIX);
300 const char *path = getenv(nver); /* try versioned name */
301 if (path == NULL) /* no versioned environment variable? */
302 path = getenv(envname); /* try unversioned name */
303 if (path == NULL || noenv(L)) /* no environment variable? */
304 lua_pushstring(L, dft); /* use default */
305 else if ((dftmark = strstr(path, LUA_PATH_SEP LUA_PATH_SEP)) == NULL)
306 lua_pushstring(L, path); /* nothing to change */
307 else { /* path contains a ";;": insert default path in its place */
308 size_t len = strlen(path);
309 luaL_Buffer b;
310 luaL_buffinit(L, &b);
311 if (path < dftmark) { /* is there a prefix before ';;'? */
312 luaL_addlstring(&b, path, dftmark - path); /* add it */
313 luaL_addchar(&b, *LUA_PATH_SEP);
314 }
315 luaL_addstring(&b, dft); /* add default */
316 if (dftmark < path + len - 2) { /* is there a suffix after ';;'? */
317 luaL_addchar(&b, *LUA_PATH_SEP);
318 luaL_addlstring(&b, dftmark + 2, (path + len - 2) - dftmark);
319 }
320 luaL_pushresult(&b);
321 }
322 setprogdir(L);
323 lua_setfield(L, -3, fieldname); /* package[fieldname] = path value */
324 lua_pop(L, 1); /* pop versioned variable name ('nver') */
325}
326
327/* }================================================================== */
328
329
330/*
331** return registry.CLIBS[path]
332*/
333static void *checkclib (lua_State *L, const char *path) {
334 void *plib;
335 lua_getfield(L, LUA_REGISTRYINDEX, CLIBS);
336 lua_getfield(L, -1, path);
337 plib = lua_touserdata(L, -1); /* plib = CLIBS[path] */
338 lua_pop(L, 2); /* pop CLIBS table and 'plib' */
339 return plib;
340}
341
342
343/*
344** registry.CLIBS[path] = plib -- for queries
345** registry.CLIBS[#CLIBS + 1] = plib -- also keep a list of all libraries
346*/
347static void addtoclib (lua_State *L, const char *path, void *plib) {
348 lua_getfield(L, LUA_REGISTRYINDEX, CLIBS);
349 lua_pushlightuserdata(L, plib);
350 lua_pushvalue(L, -1);
351 lua_setfield(L, -3, path); /* CLIBS[path] = plib */
352 lua_rawseti(L, -2, luaL_len(L, -2) + 1); /* CLIBS[#CLIBS + 1] = plib */
353 lua_pop(L, 1); /* pop CLIBS table */
354}
355
356
357/*
358** __gc tag method for CLIBS table: calls 'lsys_unloadlib' for all lib
359** handles in list CLIBS
360*/
361static int gctm (lua_State *L) {
362 lua_Integer n = luaL_len(L, 1);
363 for (; n >= 1; n--) { /* for each handle, in reverse order */
364 lua_rawgeti(L, 1, n); /* get handle CLIBS[n] */
365 lsys_unloadlib(lua_touserdata(L, -1));
366 lua_pop(L, 1); /* pop handle */
367 }
368 return 0;
369}
370
371
372
373/* error codes for 'lookforfunc' */
374#define ERRLIB 1
375#define ERRFUNC 2
376
377/*
378** Look for a C function named 'sym' in a dynamically loaded library
379** 'path'.
380** First, check whether the library is already loaded; if not, try
381** to load it.
382** Then, if 'sym' is '*', return true (as library has been loaded).
383** Otherwise, look for symbol 'sym' in the library and push a
384** C function with that symbol.
385** Return 0 and 'true' or a function in the stack; in case of
386** errors, return an error code and an error message in the stack.
387*/
388static int lookforfunc (lua_State *L, const char *path, const char *sym) {
389 void *reg = checkclib(L, path); /* check loaded C libraries */
390 if (reg == NULL) { /* must load library? */
391 reg = lsys_load(L, path, *sym == '*'); /* global symbols if 'sym'=='*' */
392 if (reg == NULL) return ERRLIB; /* unable to load library */
393 addtoclib(L, path, reg);
394 }
395 if (*sym == '*') { /* loading only library (no function)? */
396 lua_pushboolean(L, 1); /* return 'true' */
397 return 0; /* no errors */
398 }
399 else {
400 lua_CFunction f = lsys_sym(L, reg, sym);
401 if (f == NULL)
402 return ERRFUNC; /* unable to find function */
403 lua_pushcfunction(L, f); /* else create new function */
404 return 0; /* no errors */
405 }
406}
407
408
409static int ll_loadlib (lua_State *L) {
410 const char *path = luaL_checkstring(L, 1);
411 const char *init = luaL_checkstring(L, 2);
412 int stat = lookforfunc(L, path, init);
413 if (stat == 0) /* no errors? */
414 return 1; /* return the loaded function */
415 else { /* error; error message is on stack top */
416 luaL_pushfail(L);
417 lua_insert(L, -2);
418 lua_pushstring(L, (stat == ERRLIB) ? LIB_FAIL : "init");
419 return 3; /* return fail, error message, and where */
420 }
421}
422
423
424
425/*
426** {======================================================
427** 'require' function
428** =======================================================
429*/
430
431
432static int readable (const char *filename) {
433 FILE *f = fopen(filename, "r"); /* try to open file */
434 if (f == NULL) return 0; /* open failed */
435 fclose(f);
436 return 1;
437}
438
439
440/*
441** Get the next name in '*path' = 'name1;name2;name3;...', changing
442** the ending ';' to '\0' to create a zero-terminated string. Return
443** NULL when list ends.
444*/
445static const char *getnextfilename (char **path, char *end) {
446 char *sep;
447 char *name = *path;
448 if (name == end)
449 return NULL; /* no more names */
450 else if (*name == '\0') { /* from previous iteration? */
451 *name = *LUA_PATH_SEP; /* restore separator */
452 name++; /* skip it */
453 }
454 sep = strchr(name, *LUA_PATH_SEP); /* find next separator */
455 if (sep == NULL) /* separator not found? */
456 sep = end; /* name goes until the end */
457 *sep = '\0'; /* finish file name */
458 *path = sep; /* will start next search from here */
459 return name;
460}
461
462
463/*
464** Given a path such as ";blabla.so;blublu.so", pushes the string
465**
466** no file 'blabla.so'
467** no file 'blublu.so'
468*/
469static void pusherrornotfound (lua_State *L, const char *path) {
470 luaL_Buffer b;
471 luaL_buffinit(L, &b);
472 luaL_addstring(&b, "no file '");
473 luaL_addgsub(&b, path, LUA_PATH_SEP, "'\n\tno file '");
474 luaL_addstring(&b, "'");
475 luaL_pushresult(&b);
476}
477
478
479static const char *searchpath (lua_State *L, const char *name,
480 const char *path,
481 const char *sep,
482 const char *dirsep) {
483 luaL_Buffer buff;
484 char *pathname; /* path with name inserted */
485 char *endpathname; /* its end */
486 const char *filename;
487 /* separator is non-empty and appears in 'name'? */
488 if (*sep != '\0' && strchr(name, *sep) != NULL)
489 name = luaL_gsub(L, name, sep, dirsep); /* replace it by 'dirsep' */
490 luaL_buffinit(L, &buff);
491 /* add path to the buffer, replacing marks ('?') with the file name */
492 luaL_addgsub(&buff, path, LUA_PATH_MARK, name);
493 luaL_addchar(&buff, '\0');
494 pathname = luaL_buffaddr(&buff); /* writable list of file names */
495 endpathname = pathname + luaL_bufflen(&buff) - 1;
496 while ((filename = getnextfilename(&pathname, endpathname)) != NULL) {
497 if (readable(filename)) /* does file exist and is readable? */
498 return lua_pushstring(L, filename); /* save and return name */
499 }
500 luaL_pushresult(&buff); /* push path to create error message */
501 pusherrornotfound(L, lua_tostring(L, -1)); /* create error message */
502 return NULL; /* not found */
503}
504
505
506static int ll_searchpath (lua_State *L) {
507 const char *f = searchpath(L, luaL_checkstring(L, 1),
508 luaL_checkstring(L, 2),
509 luaL_optstring(L, 3, "."),
510 luaL_optstring(L, 4, LUA_DIRSEP));
511 if (f != NULL) return 1;
512 else { /* error message is on top of the stack */
513 luaL_pushfail(L);
514 lua_insert(L, -2);
515 return 2; /* return fail + error message */
516 }
517}
518
519
520static const char *findfile (lua_State *L, const char *name,
521 const char *pname,
522 const char *dirsep) {
523 const char *path;
524 lua_getfield(L, lua_upvalueindex(1), pname);
525 path = lua_tostring(L, -1);
526 if (path == NULL)
527 luaL_error(L, "'package.%s' must be a string", pname);
528 return searchpath(L, name, path, ".", dirsep);
529}
530
531
532static int checkload (lua_State *L, int stat, const char *filename) {
533 if (stat) { /* module loaded successfully? */
534 lua_pushstring(L, filename); /* will be 2nd argument to module */
535 return 2; /* return open function and file name */
536 }
537 else
538 return luaL_error(L, "error loading module '%s' from file '%s':\n\t%s",
539 lua_tostring(L, 1), filename, lua_tostring(L, -1));
540}
541
542
543static int searcher_Lua (lua_State *L) {
544 const char *filename;
545 const char *name = luaL_checkstring(L, 1);
546 filename = findfile(L, name, "path", LUA_LSUBSEP);
547 if (filename == NULL) return 1; /* module not found in this path */
548 return checkload(L, (luaL_loadfile(L, filename) == LUA_OK), filename);
549}
550
551
552/*
553** Try to find a load function for module 'modname' at file 'filename'.
554** First, change '.' to '_' in 'modname'; then, if 'modname' has
555** the form X-Y (that is, it has an "ignore mark"), build a function
556** name "luaopen_X" and look for it. (For compatibility, if that
557** fails, it also tries "luaopen_Y".) If there is no ignore mark,
558** look for a function named "luaopen_modname".
559*/
560static int loadfunc (lua_State *L, const char *filename, const char *modname) {
561 const char *openfunc;
562 const char *mark;
563 modname = luaL_gsub(L, modname, ".", LUA_OFSEP);
564 mark = strchr(modname, *LUA_IGMARK);
565 if (mark) {
566 int stat;
567 openfunc = lua_pushlstring(L, modname, mark - modname);
568 openfunc = lua_pushfstring(L, LUA_POF"%s", openfunc);
569 stat = lookforfunc(L, filename, openfunc);
570 if (stat != ERRFUNC) return stat;
571 modname = mark + 1; /* else go ahead and try old-style name */
572 }
573 openfunc = lua_pushfstring(L, LUA_POF"%s", modname);
574 return lookforfunc(L, filename, openfunc);
575}
576
577
578static int searcher_C (lua_State *L) {
579 const char *name = luaL_checkstring(L, 1);
580 const char *filename = findfile(L, name, "cpath", LUA_CSUBSEP);
581 if (filename == NULL) return 1; /* module not found in this path */
582 return checkload(L, (loadfunc(L, filename, name) == 0), filename);
583}
584
585
586static int searcher_Croot (lua_State *L) {
587 const char *filename;
588 const char *name = luaL_checkstring(L, 1);
589 const char *p = strchr(name, '.');
590 int stat;
591 if (p == NULL) return 0; /* is root */
592 lua_pushlstring(L, name, p - name);
593 filename = findfile(L, lua_tostring(L, -1), "cpath", LUA_CSUBSEP);
594 if (filename == NULL) return 1; /* root not found */
595 if ((stat = loadfunc(L, filename, name)) != 0) {
596 if (stat != ERRFUNC)
597 return checkload(L, 0, filename); /* real error */
598 else { /* open function not found */
599 lua_pushfstring(L, "no module '%s' in file '%s'", name, filename);
600 return 1;
601 }
602 }
603 lua_pushstring(L, filename); /* will be 2nd argument to module */
604 return 2;
605}
606
607
608static int searcher_preload (lua_State *L) {
609 const char *name = luaL_checkstring(L, 1);
610 lua_getfield(L, LUA_REGISTRYINDEX, LUA_PRELOAD_TABLE);
611 if (lua_getfield(L, -1, name) == LUA_TNIL) { /* not found? */
612 lua_pushfstring(L, "no field package.preload['%s']", name);
613 return 1;
614 }
615 else {
616 lua_pushliteral(L, ":preload:");
617 return 2;
618 }
619}
620
621
622static void findloader (lua_State *L, const char *name) {
623 int i;
624 luaL_Buffer msg; /* to build error message */
625 /* push 'package.searchers' to index 3 in the stack */
626 if (lua_getfield(L, lua_upvalueindex(1), "searchers") != LUA_TTABLE)
627 luaL_error(L, "'package.searchers' must be a table");
628 luaL_buffinit(L, &msg);
629 /* iterate over available searchers to find a loader */
630 for (i = 1; ; i++) {
631 luaL_addstring(&msg, "\n\t"); /* error-message prefix */
632 if (lua_rawgeti(L, 3, i) == LUA_TNIL) { /* no more searchers? */
633 lua_pop(L, 1); /* remove nil */
634 luaL_buffsub(&msg, 2); /* remove prefix */
635 luaL_pushresult(&msg); /* create error message */
636 luaL_error(L, "module '%s' not found:%s", name, lua_tostring(L, -1));
637 }
638 lua_pushstring(L, name);
639 lua_call(L, 1, 2); /* call it */
640 if (lua_isfunction(L, -2)) /* did it find a loader? */
641 return; /* module loader found */
642 else if (lua_isstring(L, -2)) { /* searcher returned error message? */
643 lua_pop(L, 1); /* remove extra return */
644 luaL_addvalue(&msg); /* concatenate error message */
645 }
646 else { /* no error message */
647 lua_pop(L, 2); /* remove both returns */
648 luaL_buffsub(&msg, 2); /* remove prefix */
649 }
650 }
651}
652
653
654static int ll_require (lua_State *L) {
655 const char *name = luaL_checkstring(L, 1);
656 lua_settop(L, 1); /* LOADED table will be at index 2 */
657 lua_getfield(L, LUA_REGISTRYINDEX, LUA_LOADED_TABLE);
658 lua_getfield(L, 2, name); /* LOADED[name] */
659 if (lua_toboolean(L, -1)) /* is it there? */
660 return 1; /* package is already loaded */
661 /* else must load package */
662 lua_pop(L, 1); /* remove 'getfield' result */
663 findloader(L, name);
664 lua_rotate(L, -2, 1); /* function <-> loader data */
665 lua_pushvalue(L, 1); /* name is 1st argument to module loader */
666 lua_pushvalue(L, -3); /* loader data is 2nd argument */
667 /* stack: ...; loader data; loader function; mod. name; loader data */
668 lua_call(L, 2, 1); /* run loader to load module */
669 /* stack: ...; loader data; result from loader */
670 if (!lua_isnil(L, -1)) /* non-nil return? */
671 lua_setfield(L, 2, name); /* LOADED[name] = returned value */
672 else
673 lua_pop(L, 1); /* pop nil */
674 if (lua_getfield(L, 2, name) == LUA_TNIL) { /* module set no value? */
675 lua_pushboolean(L, 1); /* use true as result */
676 lua_copy(L, -1, -2); /* replace loader result */
677 lua_setfield(L, 2, name); /* LOADED[name] = true */
678 }
679 lua_rotate(L, -2, 1); /* loader data <-> module result */
680 return 2; /* return module result and loader data */
681}
682
683/* }====================================================== */
684
685
686
687
688static const luaL_Reg pk_funcs[] = {
689 {"loadlib", ll_loadlib},
690 {"searchpath", ll_searchpath},
691 /* placeholders */
692 {"preload", NULL},
693 {"cpath", NULL},
694 {"path", NULL},
695 {"searchers", NULL},
696 {"loaded", NULL},
697 {NULL, NULL}
698};
699
700
701static const luaL_Reg ll_funcs[] = {
702 {"require", ll_require},
703 {NULL, NULL}
704};
705
706
707static void createsearcherstable (lua_State *L) {
708 static const lua_CFunction searchers[] =
709 {searcher_preload, searcher_Lua, searcher_C, searcher_Croot, NULL};
710 int i;
711 /* create 'searchers' table */
712 lua_createtable(L, sizeof(searchers)/sizeof(searchers[0]) - 1, 0);
713 /* fill it with predefined searchers */
714 for (i=0; searchers[i] != NULL; i++) {
715 lua_pushvalue(L, -2); /* set 'package' as upvalue for all searchers */
716 lua_pushcclosure(L, searchers[i], 1);
717 lua_rawseti(L, -2, i+1);
718 }
719 lua_setfield(L, -2, "searchers"); /* put it in field 'searchers' */
720}
721
722
723/*
724** create table CLIBS to keep track of loaded C libraries,
725** setting a finalizer to close all libraries when closing state.
726*/
727static void createclibstable (lua_State *L) {
728 luaL_getsubtable(L, LUA_REGISTRYINDEX, CLIBS); /* create CLIBS table */
729 lua_createtable(L, 0, 1); /* create metatable for CLIBS */
730 lua_pushcfunction(L, gctm);
731 lua_setfield(L, -2, "__gc"); /* set finalizer for CLIBS table */
732 lua_setmetatable(L, -2);
733}
734
735
736LUAMOD_API int luaopen_package (lua_State *L) {
737 createclibstable(L);
738 luaL_newlib(L, pk_funcs); /* create 'package' table */
739 createsearcherstable(L);
740 /* set paths */
741 setpath(L, "path", LUA_PATH_VAR, LUA_PATH_DEFAULT);
742 setpath(L, "cpath", LUA_CPATH_VAR, LUA_CPATH_DEFAULT);
743 /* store config information */
744 lua_pushliteral(L, LUA_DIRSEP "\n" LUA_PATH_SEP "\n" LUA_PATH_MARK "\n"
745 LUA_EXEC_DIR "\n" LUA_IGMARK "\n");
746 lua_setfield(L, -2, "config");
747 /* set field 'loaded' */
748 luaL_getsubtable(L, LUA_REGISTRYINDEX, LUA_LOADED_TABLE);
749 lua_setfield(L, -2, "loaded");
750 /* set field 'preload' */
751 luaL_getsubtable(L, LUA_REGISTRYINDEX, LUA_PRELOAD_TABLE);
752 lua_setfield(L, -2, "preload");
753 lua_pushglobaltable(L);
754 lua_pushvalue(L, -2); /* set 'package' as upvalue for next lib */
755 luaL_setfuncs(L, ll_funcs, 1); /* open lib into global table */
756 lua_pop(L, 1); /* pop global table */
757 return 1; /* return 'package' table */
758}
759
760