ba8b5c17 |
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 | |