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author | Li Jin <dragon-fly@qq.com> | 2021-04-21 09:36:25 +0800 |
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committer | Li Jin <dragon-fly@qq.com> | 2021-04-21 09:36:25 +0800 |
commit | b7bdf7d5d36825a1a750a74641f6d374dec5d67a (patch) | |
tree | 6b27eb6590e07c07f378305c51d0f5e0779faa83 /src/lua/loadlib.c | |
parent | b86e5af605a170a3559df0165eac3cb6b665dc49 (diff) | |
download | yuescript-b7bdf7d5d36825a1a750a74641f6d374dec5d67a.tar.gz yuescript-b7bdf7d5d36825a1a750a74641f6d374dec5d67a.tar.bz2 yuescript-b7bdf7d5d36825a1a750a74641f6d374dec5d67a.zip |
adjust some folder levels.
Diffstat (limited to 'src/lua/loadlib.c')
-rw-r--r-- | src/lua/loadlib.c | 762 |
1 files changed, 0 insertions, 762 deletions
diff --git a/src/lua/loadlib.c b/src/lua/loadlib.c deleted file mode 100644 index 6f9fa37..0000000 --- a/src/lua/loadlib.c +++ /dev/null | |||
@@ -1,762 +0,0 @@ | |||
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 (l_unlikely(lib == NULL)) | ||
136 | lua_pushstring(L, dlerror()); | ||
137 | return lib; | ||
138 | } | ||
139 | |||
140 | |||
141 | static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym) { | ||
142 | lua_CFunction f = cast_func(dlsym(lib, sym)); | ||
143 | if (l_unlikely(f == NULL)) | ||
144 | lua_pushstring(L, dlerror()); | ||
145 | return f; | ||
146 | } | ||
147 | |||
148 | /* }====================================================== */ | ||
149 | |||
150 | |||
151 | |||
152 | #elif defined(LUA_DL_DLL) /* }{ */ | ||
153 | /* | ||
154 | ** {====================================================================== | ||
155 | ** This is an implementation of loadlib for Windows using native functions. | ||
156 | ** ======================================================================= | ||
157 | */ | ||
158 | |||
159 | #include <windows.h> | ||
160 | |||
161 | |||
162 | /* | ||
163 | ** optional flags for LoadLibraryEx | ||
164 | */ | ||
165 | #if !defined(LUA_LLE_FLAGS) | ||
166 | #define LUA_LLE_FLAGS 0 | ||
167 | #endif | ||
168 | |||
169 | |||
170 | #undef setprogdir | ||
171 | |||
172 | |||
173 | /* | ||
174 | ** Replace in the path (on the top of the stack) any occurrence | ||
175 | ** of LUA_EXEC_DIR with the executable's path. | ||
176 | */ | ||
177 | static void setprogdir (lua_State *L) { | ||
178 | char buff[MAX_PATH + 1]; | ||
179 | char *lb; | ||
180 | DWORD nsize = sizeof(buff)/sizeof(char); | ||
181 | DWORD n = GetModuleFileNameA(NULL, buff, nsize); /* get exec. name */ | ||
182 | if (n == 0 || n == nsize || (lb = strrchr(buff, '\\')) == NULL) | ||
183 | luaL_error(L, "unable to get ModuleFileName"); | ||
184 | else { | ||
185 | *lb = '\0'; /* cut name on the last '\\' to get the path */ | ||
186 | luaL_gsub(L, lua_tostring(L, -1), LUA_EXEC_DIR, buff); | ||
187 | lua_remove(L, -2); /* remove original string */ | ||
188 | } | ||
189 | } | ||
190 | |||
191 | |||
192 | |||
193 | |||
194 | static void pusherror (lua_State *L) { | ||
195 | int error = GetLastError(); | ||
196 | char buffer[128]; | ||
197 | if (FormatMessageA(FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_FROM_SYSTEM, | ||
198 | NULL, error, 0, buffer, sizeof(buffer)/sizeof(char), NULL)) | ||
199 | lua_pushstring(L, buffer); | ||
200 | else | ||
201 | lua_pushfstring(L, "system error %d\n", error); | ||
202 | } | ||
203 | |||
204 | static void lsys_unloadlib (void *lib) { | ||
205 | FreeLibrary((HMODULE)lib); | ||
206 | } | ||
207 | |||
208 | |||
209 | static void *lsys_load (lua_State *L, const char *path, int seeglb) { | ||
210 | HMODULE lib = LoadLibraryExA(path, NULL, LUA_LLE_FLAGS); | ||
211 | (void)(seeglb); /* not used: symbols are 'global' by default */ | ||
212 | if (lib == NULL) pusherror(L); | ||
213 | return lib; | ||
214 | } | ||
215 | |||
216 | |||
217 | static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym) { | ||
218 | lua_CFunction f = (lua_CFunction)(voidf)GetProcAddress((HMODULE)lib, sym); | ||
219 | if (f == NULL) pusherror(L); | ||
220 | return f; | ||
221 | } | ||
222 | |||
223 | /* }====================================================== */ | ||
224 | |||
225 | |||
226 | #else /* }{ */ | ||
227 | /* | ||
228 | ** {====================================================== | ||
229 | ** Fallback for other systems | ||
230 | ** ======================================================= | ||
231 | */ | ||
232 | |||
233 | #undef LIB_FAIL | ||
234 | #define LIB_FAIL "absent" | ||
235 | |||
236 | |||
237 | #define DLMSG "dynamic libraries not enabled; check your Lua installation" | ||
238 | |||
239 | |||
240 | static void lsys_unloadlib (void *lib) { | ||
241 | (void)(lib); /* not used */ | ||
242 | } | ||
243 | |||
244 | |||
245 | static void *lsys_load (lua_State *L, const char *path, int seeglb) { | ||
246 | (void)(path); (void)(seeglb); /* not used */ | ||
247 | lua_pushliteral(L, DLMSG); | ||
248 | return NULL; | ||
249 | } | ||
250 | |||
251 | |||
252 | static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym) { | ||
253 | (void)(lib); (void)(sym); /* not used */ | ||
254 | lua_pushliteral(L, DLMSG); | ||
255 | return NULL; | ||
256 | } | ||
257 | |||
258 | /* }====================================================== */ | ||
259 | #endif /* } */ | ||
260 | |||
261 | |||
262 | /* | ||
263 | ** {================================================================== | ||
264 | ** Set Paths | ||
265 | ** =================================================================== | ||
266 | */ | ||
267 | |||
268 | /* | ||
269 | ** LUA_PATH_VAR and LUA_CPATH_VAR are the names of the environment | ||
270 | ** variables that Lua check to set its paths. | ||
271 | */ | ||
272 | #if !defined(LUA_PATH_VAR) | ||
273 | #define LUA_PATH_VAR "LUA_PATH" | ||
274 | #endif | ||
275 | |||
276 | #if !defined(LUA_CPATH_VAR) | ||
277 | #define LUA_CPATH_VAR "LUA_CPATH" | ||
278 | #endif | ||
279 | |||
280 | |||
281 | |||
282 | /* | ||
283 | ** return registry.LUA_NOENV as a boolean | ||
284 | */ | ||
285 | static int noenv (lua_State *L) { | ||
286 | int b; | ||
287 | lua_getfield(L, LUA_REGISTRYINDEX, "LUA_NOENV"); | ||
288 | b = lua_toboolean(L, -1); | ||
289 | lua_pop(L, 1); /* remove value */ | ||
290 | return b; | ||
291 | } | ||
292 | |||
293 | |||
294 | /* | ||
295 | ** Set a path | ||
296 | */ | ||
297 | static void setpath (lua_State *L, const char *fieldname, | ||
298 | const char *envname, | ||
299 | const char *dft) { | ||
300 | const char *dftmark; | ||
301 | const char *nver = lua_pushfstring(L, "%s%s", envname, LUA_VERSUFFIX); | ||
302 | const char *path = getenv(nver); /* try versioned name */ | ||
303 | if (path == NULL) /* no versioned environment variable? */ | ||
304 | path = getenv(envname); /* try unversioned name */ | ||
305 | if (path == NULL || noenv(L)) /* no environment variable? */ | ||
306 | lua_pushstring(L, dft); /* use default */ | ||
307 | else if ((dftmark = strstr(path, LUA_PATH_SEP LUA_PATH_SEP)) == NULL) | ||
308 | lua_pushstring(L, path); /* nothing to change */ | ||
309 | else { /* path contains a ";;": insert default path in its place */ | ||
310 | size_t len = strlen(path); | ||
311 | luaL_Buffer b; | ||
312 | luaL_buffinit(L, &b); | ||
313 | if (path < dftmark) { /* is there a prefix before ';;'? */ | ||
314 | luaL_addlstring(&b, path, dftmark - path); /* add it */ | ||
315 | luaL_addchar(&b, *LUA_PATH_SEP); | ||
316 | } | ||
317 | luaL_addstring(&b, dft); /* add default */ | ||
318 | if (dftmark < path + len - 2) { /* is there a suffix after ';;'? */ | ||
319 | luaL_addchar(&b, *LUA_PATH_SEP); | ||
320 | luaL_addlstring(&b, dftmark + 2, (path + len - 2) - dftmark); | ||
321 | } | ||
322 | luaL_pushresult(&b); | ||
323 | } | ||
324 | setprogdir(L); | ||
325 | lua_setfield(L, -3, fieldname); /* package[fieldname] = path value */ | ||
326 | lua_pop(L, 1); /* pop versioned variable name ('nver') */ | ||
327 | } | ||
328 | |||
329 | /* }================================================================== */ | ||
330 | |||
331 | |||
332 | /* | ||
333 | ** return registry.CLIBS[path] | ||
334 | */ | ||
335 | static void *checkclib (lua_State *L, const char *path) { | ||
336 | void *plib; | ||
337 | lua_getfield(L, LUA_REGISTRYINDEX, CLIBS); | ||
338 | lua_getfield(L, -1, path); | ||
339 | plib = lua_touserdata(L, -1); /* plib = CLIBS[path] */ | ||
340 | lua_pop(L, 2); /* pop CLIBS table and 'plib' */ | ||
341 | return plib; | ||
342 | } | ||
343 | |||
344 | |||
345 | /* | ||
346 | ** registry.CLIBS[path] = plib -- for queries | ||
347 | ** registry.CLIBS[#CLIBS + 1] = plib -- also keep a list of all libraries | ||
348 | */ | ||
349 | static void addtoclib (lua_State *L, const char *path, void *plib) { | ||
350 | lua_getfield(L, LUA_REGISTRYINDEX, CLIBS); | ||
351 | lua_pushlightuserdata(L, plib); | ||
352 | lua_pushvalue(L, -1); | ||
353 | lua_setfield(L, -3, path); /* CLIBS[path] = plib */ | ||
354 | lua_rawseti(L, -2, luaL_len(L, -2) + 1); /* CLIBS[#CLIBS + 1] = plib */ | ||
355 | lua_pop(L, 1); /* pop CLIBS table */ | ||
356 | } | ||
357 | |||
358 | |||
359 | /* | ||
360 | ** __gc tag method for CLIBS table: calls 'lsys_unloadlib' for all lib | ||
361 | ** handles in list CLIBS | ||
362 | */ | ||
363 | static int gctm (lua_State *L) { | ||
364 | lua_Integer n = luaL_len(L, 1); | ||
365 | for (; n >= 1; n--) { /* for each handle, in reverse order */ | ||
366 | lua_rawgeti(L, 1, n); /* get handle CLIBS[n] */ | ||
367 | lsys_unloadlib(lua_touserdata(L, -1)); | ||
368 | lua_pop(L, 1); /* pop handle */ | ||
369 | } | ||
370 | return 0; | ||
371 | } | ||
372 | |||
373 | |||
374 | |||
375 | /* error codes for 'lookforfunc' */ | ||
376 | #define ERRLIB 1 | ||
377 | #define ERRFUNC 2 | ||
378 | |||
379 | /* | ||
380 | ** Look for a C function named 'sym' in a dynamically loaded library | ||
381 | ** 'path'. | ||
382 | ** First, check whether the library is already loaded; if not, try | ||
383 | ** to load it. | ||
384 | ** Then, if 'sym' is '*', return true (as library has been loaded). | ||
385 | ** Otherwise, look for symbol 'sym' in the library and push a | ||
386 | ** C function with that symbol. | ||
387 | ** Return 0 and 'true' or a function in the stack; in case of | ||
388 | ** errors, return an error code and an error message in the stack. | ||
389 | */ | ||
390 | static int lookforfunc (lua_State *L, const char *path, const char *sym) { | ||
391 | void *reg = checkclib(L, path); /* check loaded C libraries */ | ||
392 | if (reg == NULL) { /* must load library? */ | ||
393 | reg = lsys_load(L, path, *sym == '*'); /* global symbols if 'sym'=='*' */ | ||
394 | if (reg == NULL) return ERRLIB; /* unable to load library */ | ||
395 | addtoclib(L, path, reg); | ||
396 | } | ||
397 | if (*sym == '*') { /* loading only library (no function)? */ | ||
398 | lua_pushboolean(L, 1); /* return 'true' */ | ||
399 | return 0; /* no errors */ | ||
400 | } | ||
401 | else { | ||
402 | lua_CFunction f = lsys_sym(L, reg, sym); | ||
403 | if (f == NULL) | ||
404 | return ERRFUNC; /* unable to find function */ | ||
405 | lua_pushcfunction(L, f); /* else create new function */ | ||
406 | return 0; /* no errors */ | ||
407 | } | ||
408 | } | ||
409 | |||
410 | |||
411 | static int ll_loadlib (lua_State *L) { | ||
412 | const char *path = luaL_checkstring(L, 1); | ||
413 | const char *init = luaL_checkstring(L, 2); | ||
414 | int stat = lookforfunc(L, path, init); | ||
415 | if (l_likely(stat == 0)) /* no errors? */ | ||
416 | return 1; /* return the loaded function */ | ||
417 | else { /* error; error message is on stack top */ | ||
418 | luaL_pushfail(L); | ||
419 | lua_insert(L, -2); | ||
420 | lua_pushstring(L, (stat == ERRLIB) ? LIB_FAIL : "init"); | ||
421 | return 3; /* return fail, error message, and where */ | ||
422 | } | ||
423 | } | ||
424 | |||
425 | |||
426 | |||
427 | /* | ||
428 | ** {====================================================== | ||
429 | ** 'require' function | ||
430 | ** ======================================================= | ||
431 | */ | ||
432 | |||
433 | |||
434 | static int readable (const char *filename) { | ||
435 | FILE *f = fopen(filename, "r"); /* try to open file */ | ||
436 | if (f == NULL) return 0; /* open failed */ | ||
437 | fclose(f); | ||
438 | return 1; | ||
439 | } | ||
440 | |||
441 | |||
442 | /* | ||
443 | ** Get the next name in '*path' = 'name1;name2;name3;...', changing | ||
444 | ** the ending ';' to '\0' to create a zero-terminated string. Return | ||
445 | ** NULL when list ends. | ||
446 | */ | ||
447 | static const char *getnextfilename (char **path, char *end) { | ||
448 | char *sep; | ||
449 | char *name = *path; | ||
450 | if (name == end) | ||
451 | return NULL; /* no more names */ | ||
452 | else if (*name == '\0') { /* from previous iteration? */ | ||
453 | *name = *LUA_PATH_SEP; /* restore separator */ | ||
454 | name++; /* skip it */ | ||
455 | } | ||
456 | sep = strchr(name, *LUA_PATH_SEP); /* find next separator */ | ||
457 | if (sep == NULL) /* separator not found? */ | ||
458 | sep = end; /* name goes until the end */ | ||
459 | *sep = '\0'; /* finish file name */ | ||
460 | *path = sep; /* will start next search from here */ | ||
461 | return name; | ||
462 | } | ||
463 | |||
464 | |||
465 | /* | ||
466 | ** Given a path such as ";blabla.so;blublu.so", pushes the string | ||
467 | ** | ||
468 | ** no file 'blabla.so' | ||
469 | ** no file 'blublu.so' | ||
470 | */ | ||
471 | static void pusherrornotfound (lua_State *L, const char *path) { | ||
472 | luaL_Buffer b; | ||
473 | luaL_buffinit(L, &b); | ||
474 | luaL_addstring(&b, "no file '"); | ||
475 | luaL_addgsub(&b, path, LUA_PATH_SEP, "'\n\tno file '"); | ||
476 | luaL_addstring(&b, "'"); | ||
477 | luaL_pushresult(&b); | ||
478 | } | ||
479 | |||
480 | |||
481 | static const char *searchpath (lua_State *L, const char *name, | ||
482 | const char *path, | ||
483 | const char *sep, | ||
484 | const char *dirsep) { | ||
485 | luaL_Buffer buff; | ||
486 | char *pathname; /* path with name inserted */ | ||
487 | char *endpathname; /* its end */ | ||
488 | const char *filename; | ||
489 | /* separator is non-empty and appears in 'name'? */ | ||
490 | if (*sep != '\0' && strchr(name, *sep) != NULL) | ||
491 | name = luaL_gsub(L, name, sep, dirsep); /* replace it by 'dirsep' */ | ||
492 | luaL_buffinit(L, &buff); | ||
493 | /* add path to the buffer, replacing marks ('?') with the file name */ | ||
494 | luaL_addgsub(&buff, path, LUA_PATH_MARK, name); | ||
495 | luaL_addchar(&buff, '\0'); | ||
496 | pathname = luaL_buffaddr(&buff); /* writable list of file names */ | ||
497 | endpathname = pathname + luaL_bufflen(&buff) - 1; | ||
498 | while ((filename = getnextfilename(&pathname, endpathname)) != NULL) { | ||
499 | if (readable(filename)) /* does file exist and is readable? */ | ||
500 | return lua_pushstring(L, filename); /* save and return name */ | ||
501 | } | ||
502 | luaL_pushresult(&buff); /* push path to create error message */ | ||
503 | pusherrornotfound(L, lua_tostring(L, -1)); /* create error message */ | ||
504 | return NULL; /* not found */ | ||
505 | } | ||
506 | |||
507 | |||
508 | static int ll_searchpath (lua_State *L) { | ||
509 | const char *f = searchpath(L, luaL_checkstring(L, 1), | ||
510 | luaL_checkstring(L, 2), | ||
511 | luaL_optstring(L, 3, "."), | ||
512 | luaL_optstring(L, 4, LUA_DIRSEP)); | ||
513 | if (f != NULL) return 1; | ||
514 | else { /* error message is on top of the stack */ | ||
515 | luaL_pushfail(L); | ||
516 | lua_insert(L, -2); | ||
517 | return 2; /* return fail + error message */ | ||
518 | } | ||
519 | } | ||
520 | |||
521 | |||
522 | static const char *findfile (lua_State *L, const char *name, | ||
523 | const char *pname, | ||
524 | const char *dirsep) { | ||
525 | const char *path; | ||
526 | lua_getfield(L, lua_upvalueindex(1), pname); | ||
527 | path = lua_tostring(L, -1); | ||
528 | if (l_unlikely(path == NULL)) | ||
529 | luaL_error(L, "'package.%s' must be a string", pname); | ||
530 | return searchpath(L, name, path, ".", dirsep); | ||
531 | } | ||
532 | |||
533 | |||
534 | static int checkload (lua_State *L, int stat, const char *filename) { | ||
535 | if (l_likely(stat)) { /* module loaded successfully? */ | ||
536 | lua_pushstring(L, filename); /* will be 2nd argument to module */ | ||
537 | return 2; /* return open function and file name */ | ||
538 | } | ||
539 | else | ||
540 | return luaL_error(L, "error loading module '%s' from file '%s':\n\t%s", | ||
541 | lua_tostring(L, 1), filename, lua_tostring(L, -1)); | ||
542 | } | ||
543 | |||
544 | |||
545 | static int searcher_Lua (lua_State *L) { | ||
546 | const char *filename; | ||
547 | const char *name = luaL_checkstring(L, 1); | ||
548 | filename = findfile(L, name, "path", LUA_LSUBSEP); | ||
549 | if (filename == NULL) return 1; /* module not found in this path */ | ||
550 | return checkload(L, (luaL_loadfile(L, filename) == LUA_OK), filename); | ||
551 | } | ||
552 | |||
553 | |||
554 | /* | ||
555 | ** Try to find a load function for module 'modname' at file 'filename'. | ||
556 | ** First, change '.' to '_' in 'modname'; then, if 'modname' has | ||
557 | ** the form X-Y (that is, it has an "ignore mark"), build a function | ||
558 | ** name "luaopen_X" and look for it. (For compatibility, if that | ||
559 | ** fails, it also tries "luaopen_Y".) If there is no ignore mark, | ||
560 | ** look for a function named "luaopen_modname". | ||
561 | */ | ||
562 | static int loadfunc (lua_State *L, const char *filename, const char *modname) { | ||
563 | const char *openfunc; | ||
564 | const char *mark; | ||
565 | modname = luaL_gsub(L, modname, ".", LUA_OFSEP); | ||
566 | mark = strchr(modname, *LUA_IGMARK); | ||
567 | if (mark) { | ||
568 | int stat; | ||
569 | openfunc = lua_pushlstring(L, modname, mark - modname); | ||
570 | openfunc = lua_pushfstring(L, LUA_POF"%s", openfunc); | ||
571 | stat = lookforfunc(L, filename, openfunc); | ||
572 | if (stat != ERRFUNC) return stat; | ||
573 | modname = mark + 1; /* else go ahead and try old-style name */ | ||
574 | } | ||
575 | openfunc = lua_pushfstring(L, LUA_POF"%s", modname); | ||
576 | return lookforfunc(L, filename, openfunc); | ||
577 | } | ||
578 | |||
579 | |||
580 | static int searcher_C (lua_State *L) { | ||
581 | const char *name = luaL_checkstring(L, 1); | ||
582 | const char *filename = findfile(L, name, "cpath", LUA_CSUBSEP); | ||
583 | if (filename == NULL) return 1; /* module not found in this path */ | ||
584 | return checkload(L, (loadfunc(L, filename, name) == 0), filename); | ||
585 | } | ||
586 | |||
587 | |||
588 | static int searcher_Croot (lua_State *L) { | ||
589 | const char *filename; | ||
590 | const char *name = luaL_checkstring(L, 1); | ||
591 | const char *p = strchr(name, '.'); | ||
592 | int stat; | ||
593 | if (p == NULL) return 0; /* is root */ | ||
594 | lua_pushlstring(L, name, p - name); | ||
595 | filename = findfile(L, lua_tostring(L, -1), "cpath", LUA_CSUBSEP); | ||
596 | if (filename == NULL) return 1; /* root not found */ | ||
597 | if ((stat = loadfunc(L, filename, name)) != 0) { | ||
598 | if (stat != ERRFUNC) | ||
599 | return checkload(L, 0, filename); /* real error */ | ||
600 | else { /* open function not found */ | ||
601 | lua_pushfstring(L, "no module '%s' in file '%s'", name, filename); | ||
602 | return 1; | ||
603 | } | ||
604 | } | ||
605 | lua_pushstring(L, filename); /* will be 2nd argument to module */ | ||
606 | return 2; | ||
607 | } | ||
608 | |||
609 | |||
610 | static int searcher_preload (lua_State *L) { | ||
611 | const char *name = luaL_checkstring(L, 1); | ||
612 | lua_getfield(L, LUA_REGISTRYINDEX, LUA_PRELOAD_TABLE); | ||
613 | if (lua_getfield(L, -1, name) == LUA_TNIL) { /* not found? */ | ||
614 | lua_pushfstring(L, "no field package.preload['%s']", name); | ||
615 | return 1; | ||
616 | } | ||
617 | else { | ||
618 | lua_pushliteral(L, ":preload:"); | ||
619 | return 2; | ||
620 | } | ||
621 | } | ||
622 | |||
623 | |||
624 | static void findloader (lua_State *L, const char *name) { | ||
625 | int i; | ||
626 | luaL_Buffer msg; /* to build error message */ | ||
627 | /* push 'package.searchers' to index 3 in the stack */ | ||
628 | if (l_unlikely(lua_getfield(L, lua_upvalueindex(1), "searchers") | ||
629 | != LUA_TTABLE)) | ||
630 | luaL_error(L, "'package.searchers' must be a table"); | ||
631 | luaL_buffinit(L, &msg); | ||
632 | /* iterate over available searchers to find a loader */ | ||
633 | for (i = 1; ; i++) { | ||
634 | luaL_addstring(&msg, "\n\t"); /* error-message prefix */ | ||
635 | if (l_unlikely(lua_rawgeti(L, 3, i) == LUA_TNIL)) { /* no more searchers? */ | ||
636 | lua_pop(L, 1); /* remove nil */ | ||
637 | luaL_buffsub(&msg, 2); /* remove prefix */ | ||
638 | luaL_pushresult(&msg); /* create error message */ | ||
639 | luaL_error(L, "module '%s' not found:%s", name, lua_tostring(L, -1)); | ||
640 | } | ||
641 | lua_pushstring(L, name); | ||
642 | lua_call(L, 1, 2); /* call it */ | ||
643 | if (lua_isfunction(L, -2)) /* did it find a loader? */ | ||
644 | return; /* module loader found */ | ||
645 | else if (lua_isstring(L, -2)) { /* searcher returned error message? */ | ||
646 | lua_pop(L, 1); /* remove extra return */ | ||
647 | luaL_addvalue(&msg); /* concatenate error message */ | ||
648 | } | ||
649 | else { /* no error message */ | ||
650 | lua_pop(L, 2); /* remove both returns */ | ||
651 | luaL_buffsub(&msg, 2); /* remove prefix */ | ||
652 | } | ||
653 | } | ||
654 | } | ||
655 | |||
656 | |||
657 | static int ll_require (lua_State *L) { | ||
658 | const char *name = luaL_checkstring(L, 1); | ||
659 | lua_settop(L, 1); /* LOADED table will be at index 2 */ | ||
660 | lua_getfield(L, LUA_REGISTRYINDEX, LUA_LOADED_TABLE); | ||
661 | lua_getfield(L, 2, name); /* LOADED[name] */ | ||
662 | if (lua_toboolean(L, -1)) /* is it there? */ | ||
663 | return 1; /* package is already loaded */ | ||
664 | /* else must load package */ | ||
665 | lua_pop(L, 1); /* remove 'getfield' result */ | ||
666 | findloader(L, name); | ||
667 | lua_rotate(L, -2, 1); /* function <-> loader data */ | ||
668 | lua_pushvalue(L, 1); /* name is 1st argument to module loader */ | ||
669 | lua_pushvalue(L, -3); /* loader data is 2nd argument */ | ||
670 | /* stack: ...; loader data; loader function; mod. name; loader data */ | ||
671 | lua_call(L, 2, 1); /* run loader to load module */ | ||
672 | /* stack: ...; loader data; result from loader */ | ||
673 | if (!lua_isnil(L, -1)) /* non-nil return? */ | ||
674 | lua_setfield(L, 2, name); /* LOADED[name] = returned value */ | ||
675 | else | ||
676 | lua_pop(L, 1); /* pop nil */ | ||
677 | if (lua_getfield(L, 2, name) == LUA_TNIL) { /* module set no value? */ | ||
678 | lua_pushboolean(L, 1); /* use true as result */ | ||
679 | lua_copy(L, -1, -2); /* replace loader result */ | ||
680 | lua_setfield(L, 2, name); /* LOADED[name] = true */ | ||
681 | } | ||
682 | lua_rotate(L, -2, 1); /* loader data <-> module result */ | ||
683 | return 2; /* return module result and loader data */ | ||
684 | } | ||
685 | |||
686 | /* }====================================================== */ | ||
687 | |||
688 | |||
689 | |||
690 | |||
691 | static const luaL_Reg pk_funcs[] = { | ||
692 | {"loadlib", ll_loadlib}, | ||
693 | {"searchpath", ll_searchpath}, | ||
694 | /* placeholders */ | ||
695 | {"preload", NULL}, | ||
696 | {"cpath", NULL}, | ||
697 | {"path", NULL}, | ||
698 | {"searchers", NULL}, | ||
699 | {"loaded", NULL}, | ||
700 | {NULL, NULL} | ||
701 | }; | ||
702 | |||
703 | |||
704 | static const luaL_Reg ll_funcs[] = { | ||
705 | {"require", ll_require}, | ||
706 | {NULL, NULL} | ||
707 | }; | ||
708 | |||
709 | |||
710 | static void createsearcherstable (lua_State *L) { | ||
711 | static const lua_CFunction searchers[] = | ||
712 | {searcher_preload, searcher_Lua, searcher_C, searcher_Croot, NULL}; | ||
713 | int i; | ||
714 | /* create 'searchers' table */ | ||
715 | lua_createtable(L, sizeof(searchers)/sizeof(searchers[0]) - 1, 0); | ||
716 | /* fill it with predefined searchers */ | ||
717 | for (i=0; searchers[i] != NULL; i++) { | ||
718 | lua_pushvalue(L, -2); /* set 'package' as upvalue for all searchers */ | ||
719 | lua_pushcclosure(L, searchers[i], 1); | ||
720 | lua_rawseti(L, -2, i+1); | ||
721 | } | ||
722 | lua_setfield(L, -2, "searchers"); /* put it in field 'searchers' */ | ||
723 | } | ||
724 | |||
725 | |||
726 | /* | ||
727 | ** create table CLIBS to keep track of loaded C libraries, | ||
728 | ** setting a finalizer to close all libraries when closing state. | ||
729 | */ | ||
730 | static void createclibstable (lua_State *L) { | ||
731 | luaL_getsubtable(L, LUA_REGISTRYINDEX, CLIBS); /* create CLIBS table */ | ||
732 | lua_createtable(L, 0, 1); /* create metatable for CLIBS */ | ||
733 | lua_pushcfunction(L, gctm); | ||
734 | lua_setfield(L, -2, "__gc"); /* set finalizer for CLIBS table */ | ||
735 | lua_setmetatable(L, -2); | ||
736 | } | ||
737 | |||
738 | |||
739 | LUAMOD_API int luaopen_package (lua_State *L) { | ||
740 | createclibstable(L); | ||
741 | luaL_newlib(L, pk_funcs); /* create 'package' table */ | ||
742 | createsearcherstable(L); | ||
743 | /* set paths */ | ||
744 | setpath(L, "path", LUA_PATH_VAR, LUA_PATH_DEFAULT); | ||
745 | setpath(L, "cpath", LUA_CPATH_VAR, LUA_CPATH_DEFAULT); | ||
746 | /* store config information */ | ||
747 | lua_pushliteral(L, LUA_DIRSEP "\n" LUA_PATH_SEP "\n" LUA_PATH_MARK "\n" | ||
748 | LUA_EXEC_DIR "\n" LUA_IGMARK "\n"); | ||
749 | lua_setfield(L, -2, "config"); | ||
750 | /* set field 'loaded' */ | ||
751 | luaL_getsubtable(L, LUA_REGISTRYINDEX, LUA_LOADED_TABLE); | ||
752 | lua_setfield(L, -2, "loaded"); | ||
753 | /* set field 'preload' */ | ||
754 | luaL_getsubtable(L, LUA_REGISTRYINDEX, LUA_PRELOAD_TABLE); | ||
755 | lua_setfield(L, -2, "preload"); | ||
756 | lua_pushglobaltable(L); | ||
757 | lua_pushvalue(L, -2); /* set 'package' as upvalue for next lib */ | ||
758 | luaL_setfuncs(L, ll_funcs, 1); /* open lib into global table */ | ||
759 | lua_pop(L, 1); /* pop global table */ | ||
760 | return 1; /* return 'package' table */ | ||
761 | } | ||
762 | |||