]>
Commit | Line | Data |
---|---|---|
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 |