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-rw-r--r--apps/plugins/lua/loadlib.c650
1 files changed, 125 insertions, 525 deletions
diff --git a/apps/plugins/lua/loadlib.c b/apps/plugins/lua/loadlib.c
index f5a63386b5..1cc7ebd7db 100644
--- a/apps/plugins/lua/loadlib.c
+++ b/apps/plugins/lua/loadlib.c
@@ -1,22 +1,14 @@
1/* 1/*
2** $Id: loadlib.c,v 1.111.1.1 2013/04/12 18:48:47 roberto Exp $ 2** $Id: loadlib.c,v 1.52.1.3 2008/08/06 13:29:28 roberto Exp $
3** Dynamic library loader for Lua 3** Dynamic library loader for Lua
4** See Copyright Notice in lua.h 4** See Copyright Notice in lua.h
5** 5**
6** This module contains an implementation of loadlib for Unix systems 6** This module contains an implementation of loadlib for Unix systems
7** that have dlfcn, an implementation for Windows, and a stub for other 7** that have dlfcn, an implementation for Darwin (Mac OS X), an
8** systems. 8** implementation for Windows, and a stub for other systems.
9*/ 9*/
10 10
11 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> 12#include <stdlib.h>
21#include <string.h> 13#include <string.h>
22 14
@@ -28,296 +20,10 @@
28 20
29#include "lauxlib.h" 21#include "lauxlib.h"
30#include "lualib.h" 22#include "lualib.h"
23#include "rocklib.h"
31 24
32 25
33/* 26#define setprogdir(L) ((void)0)
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*/
111static void ll_unloadlib (void *lib);
112static void *ll_load (lua_State *L, const char *path, int seeglb);
113static 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
129static void ll_unloadlib (void *lib) {
130 dlclose(lib);
131}
132
133
134static 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
141static 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
168static 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 = rb->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
183static 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
193static void ll_unloadlib (void *lib) {
194 FreeLibrary((HMODULE)lib);
195}
196
197
198static 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
206static 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
229static void ll_unloadlib (void *lib) {
230 (void)(lib); /* not used */
231}
232
233
234static 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
241static 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
251static 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
261static 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*/
275static 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
286static 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
307static 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 27
322 28
323/* 29/*
@@ -328,143 +34,70 @@ static int ll_loadlib (lua_State *L) {
328 34
329 35
330static int readable (const char *filename) { 36static int readable (const char *filename) {
331 return rb->file_exists(filename); 37 int f = rb->open(filename, O_RDONLY); /* try to open file */
38 if (f < 0) return 0; /* open failed */
39 rb->close(f);
40 return 1;
332} 41}
333 42
334 43
335static const char *pushnexttemplate (lua_State *L, const char *path) { 44static const char *pushnexttemplate (lua_State *L, const char *path) {
336 const char *l; 45 const char *l;
337 while (*path == *LUA_PATH_SEP) path++; /* skip separators */ 46 while (*path == *LUA_PATHSEP) path++; /* skip separators */
338 if (*path == '\0') return NULL; /* no more templates */ 47 if (*path == '\0') return NULL; /* no more templates */
339 l = strchr(path, *LUA_PATH_SEP); /* find next separator */ 48 l = strchr(path, *LUA_PATHSEP); /* find next separator */
340 if (l == NULL) l = path + strlen(path); 49 if (l == NULL) l = path + strlen(path);
341 lua_pushlstring(L, path, l - path); /* template */ 50 lua_pushlstring(L, path, l - path); /* template */
342 return l; 51 return l;
343} 52}
344 53
345 54
346static const char *searchpath (lua_State *L, const char *name, 55static const char *findfile (lua_State *L, const char *name,
347 const char *path, 56 const char *pname) {
348 const char *sep, 57 const char *path, *current_path = get_current_path(L, 2);
349 const char *dirsep) { 58 name = luaL_gsub(L, name, ".", LUA_DIRSEP);
350 luaL_Buffer msg; /* to build error message */ 59 lua_getfield(L, LUA_ENVIRONINDEX, pname);
351 luaL_buffinit(L, &msg); 60 path = lua_tostring(L, -1);
352 if (*sep != '\0') /* non-empty separator? */ 61 if (path == NULL)
353 name = luaL_gsub(L, name, sep, dirsep); /* replace it by 'dirsep' */ 62 luaL_error(L, LUA_QL("package.%s") " must be a string", pname);
63 lua_pushliteral(L, ""); /* error accumulator */
354 while ((path = pushnexttemplate(L, path)) != NULL) { 64 while ((path = pushnexttemplate(L, path)) != NULL) {
355 const char *filename = luaL_gsub(L, lua_tostring(L, -1), 65 const char *filename;
356 LUA_PATH_MARK, name); 66 filename = luaL_gsub(L, lua_tostring(L, -1), LUA_PATH_MARK, name);
67 if(current_path != NULL) filename = luaL_gsub(L, filename, "$", current_path);
357 lua_remove(L, -2); /* remove path template */ 68 lua_remove(L, -2); /* remove path template */
358 if (readable(filename)) /* does file exist and is readable? */ 69 if (readable(filename)) /* does file exist and is readable? */
359 return filename; /* return that file name */ 70 return filename; /* return that file name */
360 lua_pushfstring(L, "\n\tno file " LUA_QS, filename); 71 lua_pushfstring(L, "\n\tno file " LUA_QS, filename);
361 lua_remove(L, -2); /* remove file name */ 72 lua_remove(L, -2); /* remove file name */
362 luaL_addvalue(&msg); /* concatenate error msg. entry */ 73 lua_concat(L, 2); /* add entry to possible error message */
363 } 74 }
364 luaL_pushresult(&msg); /* create error message */
365 return NULL; /* not found */ 75 return NULL; /* not found */
366} 76}
367 77
368 78
369static int ll_searchpath (lua_State *L) { 79static void loaderror (lua_State *L, const char *filename) {
370 const char *f = searchpath(L, luaL_checkstring(L, 1), 80 luaL_error(L, "error loading module " LUA_QS " from file " LUA_QS ":\n\t%s",
371 luaL_checkstring(L, 2), 81 lua_tostring(L, 1), filename, lua_tostring(L, -1));
372 luaL_optstring(L, 3, "."),
373 luaL_optstring(L, 4, LUA_DIRSEP));
374 if (f != NULL) return 1;
375 else { /* error message is on top of the stack */
376 lua_pushnil(L);
377 lua_insert(L, -2);
378 return 2; /* return nil + error message */
379 }
380} 82}
381 83
382 84
383static const char *findfile (lua_State *L, const char *name, 85static int loader_Lua (lua_State *L) {
384 const char *pname,
385 const char *dirsep) {
386 const char *path;
387 lua_getfield(L, lua_upvalueindex(1), pname);
388 path = lua_tostring(L, -1);
389 if (path == NULL)
390 luaL_error(L, LUA_QL("package.%s") " must be a string", pname);
391 return searchpath(L, name, path, ".", dirsep);
392}
393
394
395static int checkload (lua_State *L, int stat, const char *filename) {
396 if (stat) { /* module loaded successfully? */
397 lua_pushstring(L, filename); /* will be 2nd argument to module */
398 return 2; /* return open function and file name */
399 }
400 else
401 return luaL_error(L, "error loading module " LUA_QS
402 " from file " LUA_QS ":\n\t%s",
403 lua_tostring(L, 1), filename, lua_tostring(L, -1));
404}
405
406
407static int searcher_Lua (lua_State *L) {
408 const char *filename; 86 const char *filename;
409 const char *name = luaL_checkstring(L, 1); 87 const char *name = luaL_checkstring(L, 1);
410 filename = findfile(L, name, "path", LUA_LSUBSEP); 88 filename = findfile(L, name, "path");
411 if (filename == NULL) return 1; /* module not found in this path */ 89 if (filename == NULL) return 1; /* library not found in this path */
412 return checkload(L, (luaL_loadfile(L, filename) == LUA_OK), filename); 90 if (luaL_loadfile(L, filename) != 0)
413} 91 loaderror(L, filename);
414 92 return 1; /* library loaded successfully */
415
416static int loadfunc (lua_State *L, const char *filename, const char *modname) {
417 const char *funcname;
418 const char *mark;
419 modname = luaL_gsub(L, modname, ".", LUA_OFSEP);
420 mark = strchr(modname, *LUA_IGMARK);
421 if (mark) {
422 int stat;
423 funcname = lua_pushlstring(L, modname, mark - modname);
424 funcname = lua_pushfstring(L, LUA_POF"%s", funcname);
425 stat = ll_loadfunc(L, filename, funcname);
426 if (stat != ERRFUNC) return stat;
427 modname = mark + 1; /* else go ahead and try old-style name */
428 }
429 funcname = lua_pushfstring(L, LUA_POF"%s", modname);
430 return ll_loadfunc(L, filename, funcname);
431} 93}
432 94
433 95
434static int searcher_C (lua_State *L) { 96static int loader_preload (lua_State *L) {
435 const char *name = luaL_checkstring(L, 1); 97 const char *name = luaL_checkstring(L, 1);
436 const char *filename = findfile(L, name, "cpath", LUA_CSUBSEP); 98 lua_getfield(L, LUA_ENVIRONINDEX, "preload");
437 if (filename == NULL) return 1; /* module not found in this path */ 99 if (!lua_istable(L, -1))
438 return checkload(L, (loadfunc(L, filename, name) == 0), filename); 100 luaL_error(L, LUA_QL("package.preload") " must be a table");
439}
440
441
442static int searcher_Croot (lua_State *L) {
443 const char *filename;
444 const char *name = luaL_checkstring(L, 1);
445 const char *p = strchr(name, '.');
446 int stat;
447 if (p == NULL) return 0; /* is root */
448 lua_pushlstring(L, name, p - name);
449 filename = findfile(L, lua_tostring(L, -1), "cpath", LUA_CSUBSEP);
450 if (filename == NULL) return 1; /* root not found */
451 if ((stat = loadfunc(L, filename, name)) != 0) {
452 if (stat != ERRFUNC)
453 return checkload(L, 0, filename); /* real error */
454 else { /* open function not found */
455 lua_pushfstring(L, "\n\tno module " LUA_QS " in file " LUA_QS,
456 name, filename);
457 return 1;
458 }
459 }
460 lua_pushstring(L, filename); /* will be 2nd argument to module */
461 return 2;
462}
463
464
465static int searcher_preload (lua_State *L) {
466 const char *name = luaL_checkstring(L, 1);
467 lua_getfield(L, LUA_REGISTRYINDEX, "_PRELOAD");
468 lua_getfield(L, -1, name); 101 lua_getfield(L, -1, name);
469 if (lua_isnil(L, -1)) /* not found? */ 102 if (lua_isnil(L, -1)) /* not found? */
470 lua_pushfstring(L, "\n\tno field package.preload['%s']", name); 103 lua_pushfstring(L, "\n\tno field package.preload['%s']", name);
@@ -472,53 +105,48 @@ static int searcher_preload (lua_State *L) {
472} 105}
473 106
474 107
475static void findloader (lua_State *L, const char *name) { 108static const int sentinel_ = 0;
476 int i; 109#define sentinel ((void *)&sentinel_)
477 luaL_Buffer msg; /* to build error message */
478 luaL_buffinit(L, &msg);
479 lua_getfield(L, lua_upvalueindex(1), "searchers"); /* will be at index 3 */
480 if (!lua_istable(L, 3))
481 luaL_error(L, LUA_QL("package.searchers") " must be a table");
482 /* iterate over available searchers to find a loader */
483 for (i = 1; ; i++) {
484 lua_rawgeti(L, 3, i); /* get a searcher */
485 if (lua_isnil(L, -1)) { /* no more searchers? */
486 lua_pop(L, 1); /* remove nil */
487 luaL_pushresult(&msg); /* create error message */
488 luaL_error(L, "module " LUA_QS " not found:%s",
489 name, lua_tostring(L, -1));
490 }
491 lua_pushstring(L, name);
492 lua_call(L, 1, 2); /* call it */
493 if (lua_isfunction(L, -2)) /* did it find a loader? */
494 return; /* module loader found */
495 else if (lua_isstring(L, -2)) { /* searcher returned error message? */
496 lua_pop(L, 1); /* remove extra return */
497 luaL_addvalue(&msg); /* concatenate error message */
498 }
499 else
500 lua_pop(L, 2); /* remove both returns */
501 }
502}
503 110
504 111
505static int ll_require (lua_State *L) { 112static int ll_require (lua_State *L) {
506 const char *name = luaL_checkstring(L, 1); 113 const char *name = luaL_checkstring(L, 1);
114 int i;
507 lua_settop(L, 1); /* _LOADED table will be at index 2 */ 115 lua_settop(L, 1); /* _LOADED table will be at index 2 */
508 lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED"); 116 lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
509 lua_getfield(L, 2, name); /* _LOADED[name] */ 117 lua_getfield(L, 2, name);
510 if (lua_toboolean(L, -1)) /* is it there? */ 118 if (lua_toboolean(L, -1)) { /* is it there? */
119 if (lua_touserdata(L, -1) == sentinel) /* check loops */
120 luaL_error(L, "loop or previous error loading module " LUA_QS, name);
511 return 1; /* package is already loaded */ 121 return 1; /* package is already loaded */
512 /* else must load package */ 122 }
513 lua_pop(L, 1); /* remove 'getfield' result */ 123 /* else must load it; iterate over available loaders */
514 findloader(L, name); 124 lua_getfield(L, LUA_ENVIRONINDEX, "loaders");
515 lua_pushstring(L, name); /* pass name as argument to module loader */ 125 if (!lua_istable(L, -1))
516 lua_insert(L, -2); /* name is 1st argument (before search data) */ 126 luaL_error(L, LUA_QL("package.loaders") " must be a table");
517 lua_call(L, 2, 1); /* run loader to load module */ 127 lua_pushliteral(L, ""); /* error message accumulator */
128 for (i=1; ; i++) {
129 lua_rawgeti(L, -2, i); /* get a loader */
130 if (lua_isnil(L, -1))
131 luaL_error(L, "module " LUA_QS " not found:%s",
132 name, lua_tostring(L, -2));
133 lua_pushstring(L, name);
134 lua_call(L, 1, 1); /* call it */
135 if (lua_isfunction(L, -1)) /* did it find module? */
136 break; /* module loaded successfully */
137 else if (lua_isstring(L, -1)) /* loader returned error message? */
138 lua_concat(L, 2); /* accumulate it */
139 else
140 lua_pop(L, 1);
141 }
142 lua_pushlightuserdata(L, sentinel);
143 lua_setfield(L, 2, name); /* _LOADED[name] = sentinel */
144 lua_pushstring(L, name); /* pass name as argument to module */
145 lua_call(L, 1, 1); /* run loaded module */
518 if (!lua_isnil(L, -1)) /* non-nil return? */ 146 if (!lua_isnil(L, -1)) /* non-nil return? */
519 lua_setfield(L, 2, name); /* _LOADED[name] = returned value */ 147 lua_setfield(L, 2, name); /* _LOADED[name] = returned value */
520 lua_getfield(L, 2, name); 148 lua_getfield(L, 2, name);
521 if (lua_isnil(L, -1)) { /* module did not set a value? */ 149 if (lua_touserdata(L, -1) == sentinel) { /* module did not set a value? */
522 lua_pushboolean(L, 1); /* use true as result */ 150 lua_pushboolean(L, 1); /* use true as result */
523 lua_pushvalue(L, -1); /* extra copy to be returned */ 151 lua_pushvalue(L, -1); /* extra copy to be returned */
524 lua_setfield(L, 2, name); /* _LOADED[name] = true */ 152 lua_setfield(L, 2, name); /* _LOADED[name] = true */
@@ -535,31 +163,26 @@ static int ll_require (lua_State *L) {
535** 'module' function 163** 'module' function
536** ======================================================= 164** =======================================================
537*/ 165*/
538#if defined(LUA_COMPAT_MODULE) 166
539 167
540/* 168static void setfenv (lua_State *L) {
541** changes the environment variable of calling function
542*/
543static void set_env (lua_State *L) {
544 lua_Debug ar; 169 lua_Debug ar;
545 if (lua_getstack(L, 1, &ar) == 0 || 170 if (lua_getstack(L, 1, &ar) == 0 ||
546 lua_getinfo(L, "f", &ar) == 0 || /* get calling function */ 171 lua_getinfo(L, "f", &ar) == 0 || /* get calling function */
547 lua_iscfunction(L, -1)) 172 lua_iscfunction(L, -1))
548 luaL_error(L, LUA_QL("module") " not called from a Lua function"); 173 luaL_error(L, LUA_QL("module") " not called from a Lua function");
549 lua_pushvalue(L, -2); /* copy new environment table to top */ 174 lua_pushvalue(L, -2);
550 lua_setupvalue(L, -2, 1); 175 lua_setfenv(L, -2);
551 lua_pop(L, 1); /* remove function */ 176 lua_pop(L, 1);
552} 177}
553 178
554 179
555static void dooptions (lua_State *L, int n) { 180static void dooptions (lua_State *L, int n) {
556 int i; 181 int i;
557 for (i = 2; i <= n; i++) { 182 for (i = 2; i <= n; i++) {
558 if (lua_isfunction(L, i)) { /* avoid 'calling' extra info. */ 183 lua_pushvalue(L, i); /* get option (a function) */
559 lua_pushvalue(L, i); /* get option (a function) */ 184 lua_pushvalue(L, -2); /* module */
560 lua_pushvalue(L, -2); /* module */ 185 lua_call(L, 1, 0);
561 lua_call(L, 1, 0);
562 }
563 } 186 }
564} 187}
565 188
@@ -581,8 +204,17 @@ static void modinit (lua_State *L, const char *modname) {
581 204
582static int ll_module (lua_State *L) { 205static int ll_module (lua_State *L) {
583 const char *modname = luaL_checkstring(L, 1); 206 const char *modname = luaL_checkstring(L, 1);
584 int lastarg = lua_gettop(L); /* last parameter */ 207 int loaded = lua_gettop(L) + 1; /* index of _LOADED table */
585 luaL_pushmodule(L, modname, 1); /* get/create module table */ 208 lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
209 lua_getfield(L, loaded, modname); /* get _LOADED[modname] */
210 if (!lua_istable(L, -1)) { /* not found? */
211 lua_pop(L, 1); /* remove previous result */
212 /* try global variable (and create one if it does not exist) */
213 if (luaL_findtable(L, LUA_GLOBALSINDEX, modname, 1) != NULL)
214 return luaL_error(L, "name conflict for module " LUA_QS, modname);
215 lua_pushvalue(L, -1);
216 lua_setfield(L, loaded, modname); /* _LOADED[modname] = new table */
217 }
586 /* check whether table already has a _NAME field */ 218 /* check whether table already has a _NAME field */
587 lua_getfield(L, -1, "_NAME"); 219 lua_getfield(L, -1, "_NAME");
588 if (!lua_isnil(L, -1)) /* is table an initialized module? */ 220 if (!lua_isnil(L, -1)) /* is table an initialized module? */
@@ -592,9 +224,9 @@ static int ll_module (lua_State *L) {
592 modinit(L, modname); 224 modinit(L, modname);
593 } 225 }
594 lua_pushvalue(L, -1); 226 lua_pushvalue(L, -1);
595 set_env(L); 227 setfenv(L);
596 dooptions(L, lastarg); 228 dooptions(L, loaded - 1);
597 return 1; 229 return 0;
598} 230}
599 231
600 232
@@ -605,38 +237,22 @@ static int ll_seeall (lua_State *L) {
605 lua_pushvalue(L, -1); 237 lua_pushvalue(L, -1);
606 lua_setmetatable(L, 1); 238 lua_setmetatable(L, 1);
607 } 239 }
608 lua_pushglobaltable(L); 240 lua_pushvalue(L, LUA_GLOBALSINDEX);
609 lua_setfield(L, -2, "__index"); /* mt.__index = _G */ 241 lua_setfield(L, -2, "__index"); /* mt.__index = _G */
610 return 0; 242 return 0;
611} 243}
612 244
613#endif 245
614/* }====================================================== */ 246/* }====================================================== */
615 247
616 248
617 249
618/* auxiliary mark (for internal use) */ 250/* auxiliary mark (for internal use) */
619#define AUXMARK "\1" 251#define AUXMARK "\1"
620
621
622/*
623** return registry.LUA_NOENV as a boolean
624*/
625#if 0
626static int noenv (lua_State *L) {
627 int b;
628 lua_getfield(L, LUA_REGISTRYINDEX, "LUA_NOENV");
629 b = lua_toboolean(L, -1);
630 lua_pop(L, 1); /* remove value */
631 return b;
632}
633#endif
634
635 252
636static void setpath (lua_State *L, const char *fieldname, const char *envname1, 253static void setpath (lua_State *L, const char *fieldname, const char *envname,
637 const char *envname2, const char *def) { 254 const char *def) {
638 (void)envname1; 255 (void)envname;
639 (void)envname2;
640 lua_pushstring(L, def); /* use default */ 256 lua_pushstring(L, def); /* use default */
641 setprogdir(L); 257 setprogdir(L);
642 lua_setfield(L, -2, fieldname); 258 lua_setfield(L, -2, fieldname);
@@ -644,72 +260,56 @@ static void setpath (lua_State *L, const char *fieldname, const char *envname1,
644 260
645 261
646static const luaL_Reg pk_funcs[] = { 262static const luaL_Reg pk_funcs[] = {
647 {"loadlib", ll_loadlib},
648 {"searchpath", ll_searchpath},
649#if defined(LUA_COMPAT_MODULE)
650 {"seeall", ll_seeall}, 263 {"seeall", ll_seeall},
651#endif
652 {NULL, NULL} 264 {NULL, NULL}
653}; 265};
654 266
655 267
656static const luaL_Reg ll_funcs[] = { 268static const luaL_Reg ll_funcs[] = {
657#if defined(LUA_COMPAT_MODULE)
658 {"module", ll_module}, 269 {"module", ll_module},
659#endif
660 {"require", ll_require}, 270 {"require", ll_require},
661 {NULL, NULL} 271 {NULL, NULL}
662}; 272};
663 273
664 274
665static void createsearcherstable (lua_State *L) { 275static const lua_CFunction loaders[] =
666 static const lua_CFunction searchers[] = 276 {loader_preload, loader_Lua, NULL};
667 {searcher_preload, searcher_Lua, searcher_C, searcher_Croot, NULL};
668 int i;
669 /* create 'searchers' table */
670 lua_createtable(L, sizeof(searchers)/sizeof(searchers[0]) - 1, 0);
671 /* fill it with pre-defined searchers */
672 for (i=0; searchers[i] != NULL; i++) {
673 lua_pushvalue(L, -2); /* set 'package' as upvalue for all searchers */
674 lua_pushcclosure(L, searchers[i], 1);
675 lua_rawseti(L, -2, i+1);
676 }
677}
678 277
679 278
680LUAMOD_API int luaopen_package (lua_State *L) { 279LUALIB_API int luaopen_package (lua_State *L) {
681 /* create table CLIBS to keep track of loaded C libraries */ 280 int i;
682 luaL_getsubtable(L, LUA_REGISTRYINDEX, CLIBS); 281 /* create new type _LOADLIB */
683 lua_createtable(L, 0, 1); /* metatable for CLIBS */ 282 luaL_newmetatable(L, "_LOADLIB");
684 lua_pushcfunction(L, gctm);
685 lua_setfield(L, -2, "__gc"); /* set finalizer for CLIBS table */
686 lua_setmetatable(L, -2);
687 /* create `package' table */ 283 /* create `package' table */
688 luaL_newlib(L, pk_funcs); 284 luaL_register(L, LUA_LOADLIBNAME, pk_funcs);
689 createsearcherstable(L); 285#if defined(LUA_COMPAT_LOADLIB)
690#if defined(LUA_COMPAT_LOADERS) 286 lua_getfield(L, -1, "loadlib");
691 lua_pushvalue(L, -1); /* make a copy of 'searchers' table */ 287 lua_setfield(L, LUA_GLOBALSINDEX, "loadlib");
692 lua_setfield(L, -3, "loaders"); /* put it in field `loaders' */
693#endif 288#endif
694 lua_setfield(L, -2, "searchers"); /* put it in field 'searchers' */ 289 lua_pushvalue(L, -1);
695 /* set field 'path' */ 290 lua_replace(L, LUA_ENVIRONINDEX);
696 setpath(L, "path", LUA_PATHVERSION, LUA_PATH, LUA_PATH_DEFAULT); 291 /* create `loaders' table */
697 /* set field 'cpath' */ 292 lua_createtable(L, 0, sizeof(loaders)/sizeof(loaders[0]) - 1);
698 setpath(L, "cpath", LUA_CPATHVERSION, LUA_CPATH, LUA_CPATH_DEFAULT); 293 /* fill it with pre-defined loaders */
294 for (i=0; loaders[i] != NULL; i++) {
295 lua_pushcfunction(L, loaders[i]);
296 lua_rawseti(L, -2, i+1);
297 }
298 lua_setfield(L, -2, "loaders"); /* put it in field `loaders' */
299 setpath(L, "path", LUA_PATH, LUA_PATH_DEFAULT); /* set field `path' */
699 /* store config information */ 300 /* store config information */
700 lua_pushliteral(L, LUA_DIRSEP "\n" LUA_PATH_SEP "\n" LUA_PATH_MARK "\n" 301 lua_pushliteral(L, LUA_DIRSEP "\n" LUA_PATHSEP "\n" LUA_PATH_MARK "\n"
701 LUA_EXEC_DIR "\n" LUA_IGMARK "\n"); 302 LUA_EXECDIR "\n" LUA_IGMARK);
702 lua_setfield(L, -2, "config"); 303 lua_setfield(L, -2, "config");
703 /* set field `loaded' */ 304 /* set field `loaded' */
704 luaL_getsubtable(L, LUA_REGISTRYINDEX, "_LOADED"); 305 luaL_findtable(L, LUA_REGISTRYINDEX, "_LOADED", 2);
705 lua_setfield(L, -2, "loaded"); 306 lua_setfield(L, -2, "loaded");
706 /* set field `preload' */ 307 /* set field `preload' */
707 luaL_getsubtable(L, LUA_REGISTRYINDEX, "_PRELOAD"); 308 lua_newtable(L);
708 lua_setfield(L, -2, "preload"); 309 lua_setfield(L, -2, "preload");
709 lua_pushglobaltable(L); 310 lua_pushvalue(L, LUA_GLOBALSINDEX);
710 lua_pushvalue(L, -2); /* set 'package' as upvalue for next lib */ 311 luaL_register(L, NULL, ll_funcs); /* open lib into global table */
711 luaL_setfuncs(L, ll_funcs, 1); /* open lib into global table */ 312 lua_pop(L, 1);
712 lua_pop(L, 1); /* pop global table */
713 return 1; /* return 'package' table */ 313 return 1; /* return 'package' table */
714} 314}
715 315
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-07 15:27:13 +0000