The Battle for Wesnoth  1.15.10+dev
loadlib.cpp
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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 */
62 static 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 */
74 typedef void (*voidf)(void);
75 
76 
77 /*
78 ** system-dependent functions
79 */
80 
81 /*
82 ** unload library 'lib'
83 */
84 static 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 */
92 static 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 */
99 static 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 
128 static void lsys_unloadlib (void *lib) {
129  dlclose(lib);
130 }
131 
132 
133 static 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 
140 static 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 */
175 static 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 
192 static 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 
202 static void lsys_unloadlib (void *lib) {
203  FreeLibrary((HMODULE)lib);
204 }
205 
206 
207 static 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 
215 static 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 
238 static void lsys_unloadlib (void *lib) {
239  (void)(lib); /* not used */
240 }
241 
242 
243 static void *lsys_load (lua_State *L, const char *path, int seeglb) {
244  (void)(path); (void)(seeglb); /* not used */
246  return NULL;
247 }
248 
249 
250 static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym) {
251  (void)(lib); (void)(sym); /* not used */
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 */
283 static 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 */
295 static 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 */
333 static void *checkclib (lua_State *L, const char *path) {
334  void *plib;
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 */
347 static void addtoclib (lua_State *L, const char *path, void *plib) {
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 */
361 static 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] */
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 */
388 static 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 
409 static 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 
432 static 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 */
445 static 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 */
469 static 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 
479 static 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 
506 static 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 
520 static 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 
532 static 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 
543 static 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 */
560 static 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 
578 static 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 
586 static 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 
608 static int searcher_preload (lua_State *L) {
609  const char *name = luaL_checkstring(L, 1);
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 
622 static 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 
654 static 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 */
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 
688 static 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 
701 static const luaL_Reg ll_funcs[] = {
702  {"require", ll_require},
703  {NULL, NULL}
704 };
705 
706 
707 static void createsearcherstable (lua_State *L) {
708  static const lua_CFunction searchers[] =
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 */
727 static 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 */
731  lua_setfield(L, -2, "__gc"); /* set finalizer for CLIBS table */
732  lua_setmetatable(L, -2);
733 }
734 
735 
737  createclibstable(L);
738  luaL_newlib(L, pk_funcs); /* create 'package' table */
740  /* set paths */
743  /* store config information */
745  LUA_EXEC_DIR "\n" LUA_IGMARK "\n");
746  lua_setfield(L, -2, "config");
747  /* set field 'loaded' */
749  lua_setfield(L, -2, "loaded");
750  /* set field 'preload' */
752  lua_setfield(L, -2, "preload");
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 
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