The Battle for Wesnoth  1.17.0-dev
lauxlib.cpp
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1 /*
2 ** $Id: lauxlib.c $
3 ** Auxiliary functions for building Lua libraries
4 ** See Copyright Notice in lua.h
5 */
6 
7 #define lauxlib_c
8 #define LUA_LIB
9 
10 #include "lprefix.h"
11 
12 
13 #include <errno.h>
14 #include <stdarg.h>
15 #include <stdio.h>
16 #include <stdlib.h>
17 #include <string.h>
18 
19 
20 /*
21 ** This file uses only the official API of Lua.
22 ** Any function declared here could be written as an application function.
23 */
24 
25 #include "lua.h"
26 
27 #include "lauxlib.h"
28 
29 
30 #if !defined(MAX_SIZET)
31 /* maximum value for size_t */
32 #define MAX_SIZET ((size_t)(~(size_t)0))
33 #endif
34 
35 
36 /*
37 ** {======================================================
38 ** Traceback
39 ** =======================================================
40 */
41 
42 
43 #define LEVELS1 10 /* size of the first part of the stack */
44 #define LEVELS2 11 /* size of the second part of the stack */
45 
46 
47 
48 /*
49 ** Search for 'objidx' in table at index -1. ('objidx' must be an
50 ** absolute index.) Return 1 + string at top if it found a good name.
51 */
52 static int findfield (lua_State *L, int objidx, int level) {
53  if (level == 0 || !lua_istable(L, -1))
54  return 0; /* not found */
55  lua_pushnil(L); /* start 'next' loop */
56  while (lua_next(L, -2)) { /* for each pair in table */
57  if (lua_type(L, -2) == LUA_TSTRING) { /* ignore non-string keys */
58  if (lua_rawequal(L, objidx, -1)) { /* found object? */
59  lua_pop(L, 1); /* remove value (but keep name) */
60  return 1;
61  }
62  else if (findfield(L, objidx, level - 1)) { /* try recursively */
63  /* stack: lib_name, lib_table, field_name (top) */
64  lua_pushliteral(L, "."); /* place '.' between the two names */
65  lua_replace(L, -3); /* (in the slot occupied by table) */
66  lua_concat(L, 3); /* lib_name.field_name */
67  return 1;
68  }
69  }
70  lua_pop(L, 1); /* remove value */
71  }
72  return 0; /* not found */
73 }
74 
75 
76 /*
77 ** Search for a name for a function in all loaded modules
78 */
79 static int pushglobalfuncname (lua_State *L, lua_Debug *ar) {
80  int top = lua_gettop(L);
81  lua_getinfo(L, "f", ar); /* push function */
83  if (findfield(L, top + 1, 2)) {
84  const char *name = lua_tostring(L, -1);
85  if (strncmp(name, LUA_GNAME ".", 3) == 0) { /* name start with '_G.'? */
86  lua_pushstring(L, name + 3); /* push name without prefix */
87  lua_remove(L, -2); /* remove original name */
88  }
89  lua_copy(L, -1, top + 1); /* copy name to proper place */
90  lua_settop(L, top + 1); /* remove table "loaded" and name copy */
91  return 1;
92  }
93  else {
94  lua_settop(L, top); /* remove function and global table */
95  return 0;
96  }
97 }
98 
99 
100 static void pushfuncname (lua_State *L, lua_Debug *ar) {
101  if (pushglobalfuncname(L, ar)) { /* try first a global name */
102  lua_pushfstring(L, "function '%s'", lua_tostring(L, -1));
103  lua_remove(L, -2); /* remove name */
104  }
105  else if (*ar->namewhat != '\0') /* is there a name from code? */
106  lua_pushfstring(L, "%s '%s'", ar->namewhat, ar->name); /* use it */
107  else if (*ar->what == 'm') /* main? */
108  lua_pushliteral(L, "main chunk");
109  else if (*ar->what != 'C') /* for Lua functions, use <file:line> */
110  lua_pushfstring(L, "function <%s:%d>", ar->short_src, ar->linedefined);
111  else /* nothing left... */
112  lua_pushliteral(L, "?");
113 }
114 
115 
116 static int lastlevel (lua_State *L) {
117  lua_Debug ar;
118  int li = 1, le = 1;
119  /* find an upper bound */
120  while (lua_getstack(L, le, &ar)) { li = le; le *= 2; }
121  /* do a binary search */
122  while (li < le) {
123  int m = (li + le)/2;
124  if (lua_getstack(L, m, &ar)) li = m + 1;
125  else le = m;
126  }
127  return le - 1;
128 }
129 
130 
132  const char *msg, int level) {
133  luaL_Buffer b;
134  lua_Debug ar;
135  int last = lastlevel(L1);
136  int limit2show = (last - level > LEVELS1 + LEVELS2) ? LEVELS1 : -1;
137  luaL_buffinit(L, &b);
138  if (msg) {
139  luaL_addstring(&b, msg);
140  luaL_addchar(&b, '\n');
141  }
142  luaL_addstring(&b, "stack traceback:");
143  while (lua_getstack(L1, level++, &ar)) {
144  if (limit2show-- == 0) { /* too many levels? */
145  int n = last - level - LEVELS2 + 1; /* number of levels to skip */
146  lua_pushfstring(L, "\n\t...\t(skipping %d levels)", n);
147  luaL_addvalue(&b); /* add warning about skip */
148  level += n; /* and skip to last levels */
149  }
150  else {
151  lua_getinfo(L1, "Slnt", &ar);
152  if (ar.currentline <= 0)
153  lua_pushfstring(L, "\n\t%s: in ", ar.short_src);
154  else
155  lua_pushfstring(L, "\n\t%s:%d: in ", ar.short_src, ar.currentline);
156  luaL_addvalue(&b);
157  pushfuncname(L, &ar);
158  luaL_addvalue(&b);
159  if (ar.istailcall)
160  luaL_addstring(&b, "\n\t(...tail calls...)");
161  }
162  }
163  luaL_pushresult(&b);
164 }
165 
166 /* }====================================================== */
167 
168 
169 /*
170 ** {======================================================
171 ** Error-report functions
172 ** =======================================================
173 */
174 
175 LUALIB_API int luaL_argerror (lua_State *L, int arg, const char *extramsg) {
176  lua_Debug ar;
177  if (!lua_getstack(L, 0, &ar)) /* no stack frame? */
178  return luaL_error(L, "bad argument #%d (%s)", arg, extramsg);
179  lua_getinfo(L, "n", &ar);
180  if (strcmp(ar.namewhat, "method") == 0) {
181  arg--; /* do not count 'self' */
182  if (arg == 0) /* error is in the self argument itself? */
183  return luaL_error(L, "calling '%s' on bad self (%s)",
184  ar.name, extramsg);
185  }
186  if (ar.name == NULL)
187  ar.name = (pushglobalfuncname(L, &ar)) ? lua_tostring(L, -1) : "?";
188  return luaL_error(L, "bad argument #%d to '%s' (%s)",
189  arg, ar.name, extramsg);
190 }
191 
192 
193 int luaL_typeerror (lua_State *L, int arg, const char *tname) {
194  const char *msg;
195  const char *typearg; /* name for the type of the actual argument */
196  if (luaL_getmetafield(L, arg, "__name") == LUA_TSTRING)
197  typearg = lua_tostring(L, -1); /* use the given type name */
198  else if (lua_type(L, arg) == LUA_TLIGHTUSERDATA)
199  typearg = "light userdata"; /* special name for messages */
200  else
201  typearg = luaL_typename(L, arg); /* standard name */
202  msg = lua_pushfstring(L, "%s expected, got %s", tname, typearg);
203  return luaL_argerror(L, arg, msg);
204 }
205 
206 
207 static void tag_error (lua_State *L, int arg, int tag) {
208  luaL_typeerror(L, arg, lua_typename(L, tag));
209 }
210 
211 
212 /*
213 ** The use of 'lua_pushfstring' ensures this function does not
214 ** need reserved stack space when called.
215 */
217  lua_Debug ar;
218  if (lua_getstack(L, level, &ar)) { /* check function at level */
219  lua_getinfo(L, "Sl", &ar); /* get info about it */
220  if (ar.currentline > 0) { /* is there info? */
221  lua_pushfstring(L, "%s:%d: ", ar.short_src, ar.currentline);
222  return;
223  }
224  }
225  lua_pushfstring(L, ""); /* else, no information available... */
226 }
227 
228 
229 /*
230 ** Again, the use of 'lua_pushvfstring' ensures this function does
231 ** not need reserved stack space when called. (At worst, it generates
232 ** an error with "stack overflow" instead of the given message.)
233 */
234 LUALIB_API int luaL_error (lua_State *L, const char *fmt, ...) {
235  va_list argp;
236  va_start(argp, fmt);
237  luaL_where(L, 1);
238  lua_pushvfstring(L, fmt, argp);
239  va_end(argp);
240  lua_concat(L, 2);
241  return lua_error(L);
242 }
243 
244 
245 LUALIB_API int luaL_fileresult (lua_State *L, int stat, const char *fname) {
246  int en = errno; /* calls to Lua API may change this value */
247  if (stat) {
248  lua_pushboolean(L, 1);
249  return 1;
250  }
251  else {
252  luaL_pushfail(L);
253  if (fname)
254  lua_pushfstring(L, "%s: %s", fname, strerror(en));
255  else
256  lua_pushstring(L, strerror(en));
257  lua_pushinteger(L, en);
258  return 3;
259  }
260 }
261 
262 
263 #if !defined(l_inspectstat) /* { */
264 
265 #if defined(LUA_USE_POSIX)
266 
267 #include <sys/wait.h>
268 
269 /*
270 ** use appropriate macros to interpret 'pclose' return status
271 */
272 #define l_inspectstat(stat,what) \
273  if (WIFEXITED(stat)) { stat = WEXITSTATUS(stat); } \
274  else if (WIFSIGNALED(stat)) { stat = WTERMSIG(stat); what = "signal"; }
275 
276 #else
277 
278 #define l_inspectstat(stat,what) /* no op */
279 
280 #endif
281 
282 #endif /* } */
283 
284 
286  if (stat != 0 && errno != 0) /* error with an 'errno'? */
287  return luaL_fileresult(L, 0, NULL);
288  else {
289  const char *what = "exit"; /* type of termination */
290  l_inspectstat(stat, what); /* interpret result */
291  if (*what == 'e' && stat == 0) /* successful termination? */
292  lua_pushboolean(L, 1);
293  else
294  luaL_pushfail(L);
295  lua_pushstring(L, what);
296  lua_pushinteger(L, stat);
297  return 3; /* return true/fail,what,code */
298  }
299 }
300 
301 /* }====================================================== */
302 
303 
304 
305 /*
306 ** {======================================================
307 ** Userdata's metatable manipulation
308 ** =======================================================
309 */
310 
311 LUALIB_API int luaL_newmetatable (lua_State *L, const char *tname) {
312  if (luaL_getmetatable(L, tname) != LUA_TNIL) /* name already in use? */
313  return 0; /* leave previous value on top, but return 0 */
314  lua_pop(L, 1);
315  lua_createtable(L, 0, 2); /* create metatable */
316  lua_pushstring(L, tname);
317  lua_setfield(L, -2, "__name"); /* metatable.__name = tname */
318  lua_pushvalue(L, -1);
319  lua_setfield(L, LUA_REGISTRYINDEX, tname); /* registry.name = metatable */
320  return 1;
321 }
322 
323 
324 LUALIB_API void luaL_setmetatable (lua_State *L, const char *tname) {
325  luaL_getmetatable(L, tname);
326  lua_setmetatable(L, -2);
327 }
328 
329 
330 LUALIB_API void *luaL_testudata (lua_State *L, int ud, const char *tname) {
331  void *p = lua_touserdata(L, ud);
332  if (p != NULL) { /* value is a userdata? */
333  if (lua_getmetatable(L, ud)) { /* does it have a metatable? */
334  luaL_getmetatable(L, tname); /* get correct metatable */
335  if (!lua_rawequal(L, -1, -2)) /* not the same? */
336  p = NULL; /* value is a userdata with wrong metatable */
337  lua_pop(L, 2); /* remove both metatables */
338  return p;
339  }
340  }
341  return NULL; /* value is not a userdata with a metatable */
342 }
343 
344 
345 LUALIB_API void *luaL_checkudata (lua_State *L, int ud, const char *tname) {
346  void *p = luaL_testudata(L, ud, tname);
347  luaL_argexpected(L, p != NULL, ud, tname);
348  return p;
349 }
350 
351 /* }====================================================== */
352 
353 
354 /*
355 ** {======================================================
356 ** Argument check functions
357 ** =======================================================
358 */
359 
360 LUALIB_API int luaL_checkoption (lua_State *L, int arg, const char *def,
361  const char *const lst[]) {
362  const char *name = (def) ? luaL_optstring(L, arg, def) :
363  luaL_checkstring(L, arg);
364  int i;
365  for (i=0; lst[i]; i++)
366  if (strcmp(lst[i], name) == 0)
367  return i;
368  return luaL_argerror(L, arg,
369  lua_pushfstring(L, "invalid option '%s'", name));
370 }
371 
372 
373 /*
374 ** Ensures the stack has at least 'space' extra slots, raising an error
375 ** if it cannot fulfill the request. (The error handling needs a few
376 ** extra slots to format the error message. In case of an error without
377 ** this extra space, Lua will generate the same 'stack overflow' error,
378 ** but without 'msg'.)
379 */
380 LUALIB_API void luaL_checkstack (lua_State *L, int space, const char *msg) {
381  if (!lua_checkstack(L, space)) {
382  if (msg)
383  luaL_error(L, "stack overflow (%s)", msg);
384  else
385  luaL_error(L, "stack overflow");
386  }
387 }
388 
389 
390 LUALIB_API void luaL_checktype (lua_State *L, int arg, int t) {
391  if (lua_type(L, arg) != t)
392  tag_error(L, arg, t);
393 }
394 
395 
396 LUALIB_API void luaL_checkany (lua_State *L, int arg) {
397  if (lua_type(L, arg) == LUA_TNONE)
398  luaL_argerror(L, arg, "value expected");
399 }
400 
401 
402 LUALIB_API const char *luaL_checklstring (lua_State *L, int arg, size_t *len) {
403  const char *s = lua_tolstring(L, arg, len);
404  if (!s) tag_error(L, arg, LUA_TSTRING);
405  return s;
406 }
407 
408 
409 LUALIB_API const char *luaL_optlstring (lua_State *L, int arg,
410  const char *def, size_t *len) {
411  if (lua_isnoneornil(L, arg)) {
412  if (len)
413  *len = (def ? strlen(def) : 0);
414  return def;
415  }
416  else return luaL_checklstring(L, arg, len);
417 }
418 
419 
421  int isnum;
422  lua_Number d = lua_tonumberx(L, arg, &isnum);
423  if (!isnum)
424  tag_error(L, arg, LUA_TNUMBER);
425  return d;
426 }
427 
428 
430  return luaL_opt(L, luaL_checknumber, arg, def);
431 }
432 
433 
434 static void interror (lua_State *L, int arg) {
435  if (lua_isnumber(L, arg))
436  luaL_argerror(L, arg, "number has no integer representation");
437  else
438  tag_error(L, arg, LUA_TNUMBER);
439 }
440 
441 
443  int isnum;
444  lua_Integer d = lua_tointegerx(L, arg, &isnum);
445  if (!isnum) {
446  interror(L, arg);
447  }
448  return d;
449 }
450 
451 
453  lua_Integer def) {
454  return luaL_opt(L, luaL_checkinteger, arg, def);
455 }
456 
457 /* }====================================================== */
458 
459 
460 /*
461 ** {======================================================
462 ** Generic Buffer manipulation
463 ** =======================================================
464 */
465 
466 /* userdata to box arbitrary data */
467 typedef struct UBox {
468  void *box;
469  size_t bsize;
470 } UBox;
471 
472 
473 static void *resizebox (lua_State *L, int idx, size_t newsize) {
474  void *ud;
475  lua_Alloc allocf = lua_getallocf(L, &ud);
476  UBox *box = (UBox *)lua_touserdata(L, idx);
477  void *temp = allocf(ud, box->box, box->bsize, newsize);
478  if (temp == NULL && newsize > 0) { /* allocation error? */
479  lua_pushliteral(L, "not enough memory");
480  lua_error(L); /* raise a memory error */
481  }
482  box->box = temp;
483  box->bsize = newsize;
484  return temp;
485 }
486 
487 
488 static int boxgc (lua_State *L) {
489  resizebox(L, 1, 0);
490  return 0;
491 }
492 
493 
494 static const luaL_Reg boxmt[] = { /* box metamethods */
495  {"__gc", boxgc},
496  {"__close", boxgc},
497  {NULL, NULL}
498 };
499 
500 
501 static void newbox (lua_State *L) {
502  UBox *box = (UBox *)lua_newuserdatauv(L, sizeof(UBox), 0);
503  box->box = NULL;
504  box->bsize = 0;
505  if (luaL_newmetatable(L, "_UBOX*")) /* creating metatable? */
506  luaL_setfuncs(L, boxmt, 0); /* set its metamethods */
507  lua_setmetatable(L, -2);
508 }
509 
510 
511 /*
512 ** check whether buffer is using a userdata on the stack as a temporary
513 ** buffer
514 */
515 #define buffonstack(B) ((B)->b != (B)->init.b)
516 
517 
518 /*
519 ** Compute new size for buffer 'B', enough to accommodate extra 'sz'
520 ** bytes.
521 */
522 static size_t newbuffsize (luaL_Buffer *B, size_t sz) {
523  size_t newsize = B->size * 2; /* double buffer size */
524  if (MAX_SIZET - sz < B->n) /* overflow in (B->n + sz)? */
525  return luaL_error(B->L, "buffer too large");
526  if (newsize < B->n + sz) /* double is not big enough? */
527  newsize = B->n + sz;
528  return newsize;
529 }
530 
531 
532 /*
533 ** Returns a pointer to a free area with at least 'sz' bytes in buffer
534 ** 'B'. 'boxidx' is the relative position in the stack where the
535 ** buffer's box is or should be.
536 */
537 static char *prepbuffsize (luaL_Buffer *B, size_t sz, int boxidx) {
538  if (B->size - B->n >= sz) /* enough space? */
539  return B->b + B->n;
540  else {
541  lua_State *L = B->L;
542  char *newbuff;
543  size_t newsize = newbuffsize(B, sz);
544  /* create larger buffer */
545  if (buffonstack(B)) /* buffer already has a box? */
546  newbuff = (char *)resizebox(L, boxidx, newsize); /* resize it */
547  else { /* no box yet */
548  lua_pushnil(L); /* reserve slot for final result */
549  newbox(L); /* create a new box */
550  /* move box (and slot) to its intended position */
551  lua_rotate(L, boxidx - 1, 2);
552  lua_toclose(L, boxidx);
553  newbuff = (char *)resizebox(L, boxidx, newsize);
554  memcpy(newbuff, B->b, B->n * sizeof(char)); /* copy original content */
555  }
556  B->b = newbuff;
557  B->size = newsize;
558  return newbuff + B->n;
559  }
560 }
561 
562 /*
563 ** returns a pointer to a free area with at least 'sz' bytes
564 */
565 LUALIB_API char *luaL_prepbuffsize (luaL_Buffer *B, size_t sz) {
566  return prepbuffsize(B, sz, -1);
567 }
568 
569 
570 LUALIB_API void luaL_addlstring (luaL_Buffer *B, const char *s, size_t l) {
571  if (l > 0) { /* avoid 'memcpy' when 's' can be NULL */
572  char *b = prepbuffsize(B, l, -1);
573  memcpy(b, s, l * sizeof(char));
574  luaL_addsize(B, l);
575  }
576 }
577 
578 
579 LUALIB_API void luaL_addstring (luaL_Buffer *B, const char *s) {
580  luaL_addlstring(B, s, strlen(s));
581 }
582 
583 
585  lua_State *L = B->L;
586  lua_pushlstring(L, B->b, B->n);
587  if (buffonstack(B)) {
588  lua_copy(L, -1, -3); /* move string to reserved slot */
589  lua_pop(L, 2); /* pop string and box (closing the box) */
590  }
591 }
592 
593 
595  luaL_addsize(B, sz);
596  luaL_pushresult(B);
597 }
598 
599 
600 /*
601 ** 'luaL_addvalue' is the only function in the Buffer system where the
602 ** box (if existent) is not on the top of the stack. So, instead of
603 ** calling 'luaL_addlstring', it replicates the code using -2 as the
604 ** last argument to 'prepbuffsize', signaling that the box is (or will
605 ** be) bellow the string being added to the buffer. (Box creation can
606 ** trigger an emergency GC, so we should not remove the string from the
607 ** stack before we have the space guaranteed.)
608 */
610  lua_State *L = B->L;
611  size_t len;
612  const char *s = lua_tolstring(L, -1, &len);
613  char *b = prepbuffsize(B, len, -2);
614  memcpy(b, s, len * sizeof(char));
615  luaL_addsize(B, len);
616  lua_pop(L, 1); /* pop string */
617 }
618 
619 
621  B->L = L;
622  B->b = B->init.b;
623  B->n = 0;
624  B->size = LUAL_BUFFERSIZE;
625 }
626 
627 
629  luaL_buffinit(L, B);
630  return prepbuffsize(B, sz, -1);
631 }
632 
633 /* }====================================================== */
634 
635 
636 /*
637 ** {======================================================
638 ** Reference system
639 ** =======================================================
640 */
641 
642 /* index of free-list header */
643 #define freelist 0
644 
645 
647  int ref;
648  if (lua_isnil(L, -1)) {
649  lua_pop(L, 1); /* remove from stack */
650  return LUA_REFNIL; /* 'nil' has a unique fixed reference */
651  }
652  t = lua_absindex(L, t);
653  lua_rawgeti(L, t, freelist); /* get first free element */
654  ref = (int)lua_tointeger(L, -1); /* ref = t[freelist] */
655  lua_pop(L, 1); /* remove it from stack */
656  if (ref != 0) { /* any free element? */
657  lua_rawgeti(L, t, ref); /* remove it from list */
658  lua_rawseti(L, t, freelist); /* (t[freelist] = t[ref]) */
659  }
660  else /* no free elements */
661  ref = (int)lua_rawlen(L, t) + 1; /* get a new reference */
662  lua_rawseti(L, t, ref);
663  return ref;
664 }
665 
666 
667 LUALIB_API void luaL_unref (lua_State *L, int t, int ref) {
668  if (ref >= 0) {
669  t = lua_absindex(L, t);
670  lua_rawgeti(L, t, freelist);
671  lua_rawseti(L, t, ref); /* t[ref] = t[freelist] */
672  lua_pushinteger(L, ref);
673  lua_rawseti(L, t, freelist); /* t[freelist] = ref */
674  }
675 }
676 
677 /* }====================================================== */
678 
679 
680 /*
681 ** {======================================================
682 ** Load functions
683 ** =======================================================
684 */
685 
686 typedef struct LoadF {
687  int n; /* number of pre-read characters */
688  FILE *f; /* file being read */
689  char buff[BUFSIZ]; /* area for reading file */
690 } LoadF;
691 
692 
693 static const char *getF (lua_State *L, void *ud, size_t *size) {
694  LoadF *lf = (LoadF *)ud;
695  (void)L; /* not used */
696  if (lf->n > 0) { /* are there pre-read characters to be read? */
697  *size = lf->n; /* return them (chars already in buffer) */
698  lf->n = 0; /* no more pre-read characters */
699  }
700  else { /* read a block from file */
701  /* 'fread' can return > 0 *and* set the EOF flag. If next call to
702  'getF' called 'fread', it might still wait for user input.
703  The next check avoids this problem. */
704  if (feof(lf->f)) return NULL;
705  *size = fread(lf->buff, 1, sizeof(lf->buff), lf->f); /* read block */
706  }
707  return lf->buff;
708 }
709 
710 
711 static int errfile (lua_State *L, const char *what, int fnameindex) {
712  const char *serr = strerror(errno);
713  const char *filename = lua_tostring(L, fnameindex) + 1;
714  lua_pushfstring(L, "cannot %s %s: %s", what, filename, serr);
715  lua_remove(L, fnameindex);
716  return LUA_ERRFILE;
717 }
718 
719 
720 static int skipBOM (LoadF *lf) {
721  const char *p = "\xEF\xBB\xBF"; /* UTF-8 BOM mark */
722  int c;
723  lf->n = 0;
724  do {
725  c = getc(lf->f);
726  if (c == EOF || c != *(const unsigned char *)p++) return c;
727  lf->buff[lf->n++] = c; /* to be read by the parser */
728  } while (*p != '\0');
729  lf->n = 0; /* prefix matched; discard it */
730  return getc(lf->f); /* return next character */
731 }
732 
733 
734 /*
735 ** reads the first character of file 'f' and skips an optional BOM mark
736 ** in its beginning plus its first line if it starts with '#'. Returns
737 ** true if it skipped the first line. In any case, '*cp' has the
738 ** first "valid" character of the file (after the optional BOM and
739 ** a first-line comment).
740 */
741 static int skipcomment (LoadF *lf, int *cp) {
742  int c = *cp = skipBOM(lf);
743  if (c == '#') { /* first line is a comment (Unix exec. file)? */
744  do { /* skip first line */
745  c = getc(lf->f);
746  } while (c != EOF && c != '\n');
747  *cp = getc(lf->f); /* skip end-of-line, if present */
748  return 1; /* there was a comment */
749  }
750  else return 0; /* no comment */
751 }
752 
753 
754 LUALIB_API int luaL_loadfilex (lua_State *L, const char *filename,
755  const char *mode) {
756  LoadF lf;
757  int status, readstatus;
758  int c;
759  int fnameindex = lua_gettop(L) + 1; /* index of filename on the stack */
760  if (filename == NULL) {
761  lua_pushliteral(L, "=stdin");
762  lf.f = stdin;
763  }
764  else {
765  lua_pushfstring(L, "@%s", filename);
766  lf.f = fopen(filename, "r");
767  if (lf.f == NULL) return errfile(L, "open", fnameindex);
768  }
769  if (skipcomment(&lf, &c)) /* read initial portion */
770  lf.buff[lf.n++] = '\n'; /* add line to correct line numbers */
771  if (c == LUA_SIGNATURE[0] && filename) { /* binary file? */
772  lf.f = freopen(filename, "rb", lf.f); /* reopen in binary mode */
773  if (lf.f == NULL) return errfile(L, "reopen", fnameindex);
774  skipcomment(&lf, &c); /* re-read initial portion */
775  }
776  if (c != EOF)
777  lf.buff[lf.n++] = c; /* 'c' is the first character of the stream */
778  status = lua_load(L, getF, &lf, lua_tostring(L, -1), mode);
779  readstatus = ferror(lf.f);
780  if (filename) fclose(lf.f); /* close file (even in case of errors) */
781  if (readstatus) {
782  lua_settop(L, fnameindex); /* ignore results from 'lua_load' */
783  return errfile(L, "read", fnameindex);
784  }
785  lua_remove(L, fnameindex);
786  return status;
787 }
788 
789 
790 typedef struct LoadS {
791  const char *s;
792  size_t size;
793 } LoadS;
794 
795 
796 static const char *getS (lua_State *L, void *ud, size_t *size) {
797  LoadS *ls = (LoadS *)ud;
798  (void)L; /* not used */
799  if (ls->size == 0) return NULL;
800  *size = ls->size;
801  ls->size = 0;
802  return ls->s;
803 }
804 
805 
806 LUALIB_API int luaL_loadbufferx (lua_State *L, const char *buff, size_t size,
807  const char *name, const char *mode) {
808  LoadS ls;
809  ls.s = buff;
810  ls.size = size;
811  return lua_load(L, getS, &ls, name, mode);
812 }
813 
814 
815 LUALIB_API int luaL_loadstring (lua_State *L, const char *s) {
816  return luaL_loadbuffer(L, s, strlen(s), s);
817 }
818 
819 /* }====================================================== */
820 
821 
822 
823 LUALIB_API int luaL_getmetafield (lua_State *L, int obj, const char *event) {
824  if (!lua_getmetatable(L, obj)) /* no metatable? */
825  return LUA_TNIL;
826  else {
827  int tt;
828  lua_pushstring(L, event);
829  tt = lua_rawget(L, -2);
830  if (tt == LUA_TNIL) /* is metafield nil? */
831  lua_pop(L, 2); /* remove metatable and metafield */
832  else
833  lua_remove(L, -2); /* remove only metatable */
834  return tt; /* return metafield type */
835  }
836 }
837 
838 
839 LUALIB_API int luaL_callmeta (lua_State *L, int obj, const char *event) {
840  obj = lua_absindex(L, obj);
841  if (luaL_getmetafield(L, obj, event) == LUA_TNIL) /* no metafield? */
842  return 0;
843  lua_pushvalue(L, obj);
844  lua_call(L, 1, 1);
845  return 1;
846 }
847 
848 
850  lua_Integer l;
851  int isnum;
852  lua_len(L, idx);
853  l = lua_tointegerx(L, -1, &isnum);
854  if (!isnum)
855  luaL_error(L, "object length is not an integer");
856  lua_pop(L, 1); /* remove object */
857  return l;
858 }
859 
860 
861 LUALIB_API const char *luaL_tolstring (lua_State *L, int idx, size_t *len) {
862  if (luaL_callmeta(L, idx, "__tostring")) { /* metafield? */
863  if (!lua_isstring(L, -1))
864  luaL_error(L, "'__tostring' must return a string");
865  }
866  else {
867  switch (lua_type(L, idx)) {
868  case LUA_TNUMBER: {
869  if (lua_isinteger(L, idx))
870  lua_pushfstring(L, "%I", (LUAI_UACINT)lua_tointeger(L, idx));
871  else
872  lua_pushfstring(L, "%f", (LUAI_UACNUMBER)lua_tonumber(L, idx));
873  break;
874  }
875  case LUA_TSTRING:
876  lua_pushvalue(L, idx);
877  break;
878  case LUA_TBOOLEAN:
879  lua_pushstring(L, (lua_toboolean(L, idx) ? "true" : "false"));
880  break;
881  case LUA_TNIL:
882  lua_pushliteral(L, "nil");
883  break;
884  default: {
885  int tt = luaL_getmetafield(L, idx, "__name"); /* try name */
886  const char *kind = (tt == LUA_TSTRING) ? lua_tostring(L, -1) :
887  luaL_typename(L, idx);
888  lua_pushfstring(L, "%s: %p", kind, lua_topointer(L, idx));
889  if (tt != LUA_TNIL)
890  lua_remove(L, -2); /* remove '__name' */
891  break;
892  }
893  }
894  }
895  return lua_tolstring(L, -1, len);
896 }
897 
898 
899 /*
900 ** set functions from list 'l' into table at top - 'nup'; each
901 ** function gets the 'nup' elements at the top as upvalues.
902 ** Returns with only the table at the stack.
903 */
904 LUALIB_API void luaL_setfuncs (lua_State *L, const luaL_Reg *l, int nup) {
905  luaL_checkstack(L, nup, "too many upvalues");
906  for (; l->name != NULL; l++) { /* fill the table with given functions */
907  if (l->func == NULL) /* place holder? */
908  lua_pushboolean(L, 0);
909  else {
910  int i;
911  for (i = 0; i < nup; i++) /* copy upvalues to the top */
912  lua_pushvalue(L, -nup);
913  lua_pushcclosure(L, l->func, nup); /* closure with those upvalues */
914  }
915  lua_setfield(L, -(nup + 2), l->name);
916  }
917  lua_pop(L, nup); /* remove upvalues */
918 }
919 
920 
921 /*
922 ** ensure that stack[idx][fname] has a table and push that table
923 ** into the stack
924 */
925 LUALIB_API int luaL_getsubtable (lua_State *L, int idx, const char *fname) {
926  if (lua_getfield(L, idx, fname) == LUA_TTABLE)
927  return 1; /* table already there */
928  else {
929  lua_pop(L, 1); /* remove previous result */
930  idx = lua_absindex(L, idx);
931  lua_newtable(L);
932  lua_pushvalue(L, -1); /* copy to be left at top */
933  lua_setfield(L, idx, fname); /* assign new table to field */
934  return 0; /* false, because did not find table there */
935  }
936 }
937 
938 
939 /*
940 ** Stripped-down 'require': After checking "loaded" table, calls 'openf'
941 ** to open a module, registers the result in 'package.loaded' table and,
942 ** if 'glb' is true, also registers the result in the global table.
943 ** Leaves resulting module on the top.
944 */
945 LUALIB_API void luaL_requiref (lua_State *L, const char *modname,
946  lua_CFunction openf, int glb) {
948  lua_getfield(L, -1, modname); /* LOADED[modname] */
949  if (!lua_toboolean(L, -1)) { /* package not already loaded? */
950  lua_pop(L, 1); /* remove field */
951  lua_pushcfunction(L, openf);
952  lua_pushstring(L, modname); /* argument to open function */
953  lua_call(L, 1, 1); /* call 'openf' to open module */
954  lua_pushvalue(L, -1); /* make copy of module (call result) */
955  lua_setfield(L, -3, modname); /* LOADED[modname] = module */
956  }
957  lua_remove(L, -2); /* remove LOADED table */
958  if (glb) {
959  lua_pushvalue(L, -1); /* copy of module */
960  lua_setglobal(L, modname); /* _G[modname] = module */
961  }
962 }
963 
964 
965 LUALIB_API void luaL_addgsub (luaL_Buffer *b, const char *s,
966  const char *p, const char *r) {
967  const char *wild;
968  size_t l = strlen(p);
969  while ((wild = strstr(s, p)) != NULL) {
970  luaL_addlstring(b, s, wild - s); /* push prefix */
971  luaL_addstring(b, r); /* push replacement in place of pattern */
972  s = wild + l; /* continue after 'p' */
973  }
974  luaL_addstring(b, s); /* push last suffix */
975 }
976 
977 
978 LUALIB_API const char *luaL_gsub (lua_State *L, const char *s,
979  const char *p, const char *r) {
980  luaL_Buffer b;
981  luaL_buffinit(L, &b);
982  luaL_addgsub(&b, s, p, r);
983  luaL_pushresult(&b);
984  return lua_tostring(L, -1);
985 }
986 
987 
988 static void *l_alloc (void *ud, void *ptr, size_t osize, size_t nsize) {
989  (void)ud; (void)osize; /* not used */
990  if (nsize == 0) {
991  free(ptr);
992  return NULL;
993  }
994  else
995  return realloc(ptr, nsize);
996 }
997 
998 
999 static int panic (lua_State *L) {
1000  const char *msg = lua_tostring(L, -1);
1001  if (msg == NULL) msg = "error object is not a string";
1002  lua_writestringerror("PANIC: unprotected error in call to Lua API (%s)\n",
1003  msg);
1004  return 0; /* return to Lua to abort */
1005 }
1006 
1007 
1008 /*
1009 ** Warning functions:
1010 ** warnfoff: warning system is off
1011 ** warnfon: ready to start a new message
1012 ** warnfcont: previous message is to be continued
1013 */
1014 static void warnfoff (void *ud, const char *message, int tocont);
1015 static void warnfon (void *ud, const char *message, int tocont);
1016 static void warnfcont (void *ud, const char *message, int tocont);
1017 
1018 
1019 /*
1020 ** Check whether message is a control message. If so, execute the
1021 ** control or ignore it if unknown.
1022 */
1023 static int checkcontrol (lua_State *L, const char *message, int tocont) {
1024  if (tocont || *(message++) != '@') /* not a control message? */
1025  return 0;
1026  else {
1027  if (strcmp(message, "off") == 0)
1028  lua_setwarnf(L, warnfoff, L); /* turn warnings off */
1029  else if (strcmp(message, "on") == 0)
1030  lua_setwarnf(L, warnfon, L); /* turn warnings on */
1031  return 1; /* it was a control message */
1032  }
1033 }
1034 
1035 
1036 static void warnfoff (void *ud, const char *message, int tocont) {
1037  checkcontrol((lua_State *)ud, message, tocont);
1038 }
1039 
1040 
1041 /*
1042 ** Writes the message and handle 'tocont', finishing the message
1043 ** if needed and setting the next warn function.
1044 */
1045 static void warnfcont (void *ud, const char *message, int tocont) {
1046  lua_State *L = (lua_State *)ud;
1047  lua_writestringerror("%s", message); /* write message */
1048  if (tocont) /* not the last part? */
1049  lua_setwarnf(L, warnfcont, L); /* to be continued */
1050  else { /* last part */
1051  lua_writestringerror("%s", "\n"); /* finish message with end-of-line */
1052  lua_setwarnf(L, warnfon, L); /* next call is a new message */
1053  }
1054 }
1055 
1056 
1057 static void warnfon (void *ud, const char *message, int tocont) {
1058  if (checkcontrol((lua_State *)ud, message, tocont)) /* control message? */
1059  return; /* nothing else to be done */
1060  lua_writestringerror("%s", "Lua warning: "); /* start a new warning */
1061  warnfcont(ud, message, tocont); /* finish processing */
1062 }
1063 
1064 
1066  lua_State *L = lua_newstate(l_alloc, NULL);
1067  if (L) {
1068  lua_atpanic(L, &panic);
1069  lua_setwarnf(L, warnfoff, L); /* default is warnings off */
1070  }
1071  return L;
1072 }
1073 
1074 
1076  lua_Number v = lua_version(L);
1077  if (sz != LUAL_NUMSIZES) /* check numeric types */
1078  luaL_error(L, "core and library have incompatible numeric types");
1079  else if (v != ver)
1080  luaL_error(L, "version mismatch: app. needs %f, Lua core provides %f",
1081  (LUAI_UACNUMBER)ver, (LUAI_UACNUMBER)v);
1082 }
1083 
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char istailcall
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LUALIB_API int luaL_loadbufferx(lua_State *L, const char *buff, size_t size, const char *name, const char *mode)
Definition: lauxlib.cpp:806
#define LUA_TNIL
Definition: lua.h:65
#define luaL_opt(L, f, n, d)
Definition: lauxlib.h:151
LUA_API void * lua_newuserdatauv(lua_State *L, size_t size, int nuvalue)
Definition: lapi.cpp:1311
void *(* lua_Alloc)(void *ud, void *ptr, size_t osize, size_t nsize)
Definition: lua.h:125
LUA_API int lua_toboolean(lua_State *L, int idx)
Definition: lapi.cpp:375
static void * l_alloc(void *ud, void *ptr, size_t osize, size_t nsize)
Definition: lauxlib.cpp:988
LUALIB_API void luaL_buffinit(lua_State *L, luaL_Buffer *B)
Definition: lauxlib.cpp:620
LUA_API const char * lua_pushlstring(lua_State *L, const char *s, size_t len)
Definition: lapi.cpp:502
#define MAX_SIZET
Definition: lauxlib.cpp:32
#define LUA_TNUMBER
Definition: lua.h:68
LUALIB_API void luaL_where(lua_State *L, int level)
Definition: lauxlib.cpp:216
LUA_API int lua_getmetatable(lua_State *L, int objindex)
Definition: lapi.cpp:741
LUA_API void lua_setglobal(lua_State *L, const char *name)
Definition: lapi.cpp:813
static char * prepbuffsize(luaL_Buffer *B, size_t sz, int boxidx)
Definition: lauxlib.cpp:537
LUA_API int lua_setmetatable(lua_State *L, int objindex)
Definition: lapi.cpp:901
struct LoadF LoadF
LUA_API const char * lua_tolstring(lua_State *L, int idx, size_t *len)
Definition: lapi.cpp:381
LUALIB_API void * luaL_testudata(lua_State *L, int ud, const char *tname)
Definition: lauxlib.cpp:330
#define l_inspectstat(stat, what)
Definition: lauxlib.cpp:278
LUALIB_API int luaL_callmeta(lua_State *L, int obj, const char *event)
Definition: lauxlib.cpp:839
#define luaL_addchar(B, c)
Definition: lauxlib.h:182
LUALIB_API void luaL_traceback(lua_State *L, lua_State *L1, const char *msg, int level)
Definition: lauxlib.cpp:131
#define lua_newtable(L)
Definition: lua.h:366
LUALIB_API void luaL_addlstring(luaL_Buffer *B, const char *s, size_t l)
Definition: lauxlib.cpp:570
LUA_API void lua_toclose(lua_State *L, int idx)
Definition: lapi.cpp:1237
LUA_API void lua_pushnil(lua_State *L)
Definition: lapi.cpp:473
LUA_API void lua_len(lua_State *L, int idx)
Definition: lapi.cpp:1267
#define lua_pushliteral(L, s)
Definition: lua.h:381
LUALIB_API void luaL_checktype(lua_State *L, int arg, int t)
Definition: lauxlib.cpp:390
lua_State * L
Definition: lauxlib.h:170
size_t n
Definition: lauxlib.h:169
LUALIB_API int luaL_newmetatable(lua_State *L, const char *tname)
Definition: lauxlib.cpp:311
LUA_API void * lua_touserdata(lua_State *L, int idx)
Definition: lapi.cpp:432
#define lua_isnil(L, n)
Definition: lua.h:375
LUA_API lua_Integer lua_tointegerx(lua_State *L, int idx, int *pisnum)
Definition: lapi.cpp:365
std::size_t i
Definition: function.cpp:967
static void * resizebox(lua_State *L, int idx, size_t newsize)
Definition: lauxlib.cpp:473
int n
Definition: lauxlib.cpp:687
LUALIB_API lua_Integer luaL_checkinteger(lua_State *L, int arg)
Definition: lauxlib.cpp:442
#define LEVELS2
Definition: lauxlib.cpp:44
LUA_API int lua_getinfo(lua_State *L, const char *what, lua_Debug *ar)
Definition: ldebug.cpp:386
mock_party p
static map_location::DIRECTION s
LUA_API int lua_load(lua_State *L, lua_Reader reader, void *data, const char *chunkname, const char *mode)
Definition: lapi.cpp:1054
#define lua_replace(L, idx)
Definition: lua.h:393
#define LUAI_UACINT
Definition: luaconf.h:496
static void warnfoff(void *ud, const char *message, int tocont)
Definition: lauxlib.cpp:1036
#define lua_tostring(L, i)
Definition: lua.h:386
static const char * getF(lua_State *L, void *ud, size_t *size)
Definition: lauxlib.cpp:693
LUA_API lua_State * lua_newstate(lua_Alloc f, void *ud)
Definition: lstate.cpp:349
LUA_API void lua_rotate(lua_State *L, int idx, int n)
Definition: lapi.cpp:217
LUA_API void lua_pushvalue(lua_State *L, int idx)
Definition: lapi.cpp:246
LUA_API const char * lua_pushvfstring(lua_State *L, const char *fmt, va_list argp)
Definition: lapi.cpp:531
LUA_API int lua_isinteger(lua_State *L, int idx)
Definition: lapi.cpp:279
LUA_API int lua_isnumber(lua_State *L, int idx)
Definition: lapi.cpp:285
#define lua_call(L, n, r)
Definition: lua.h:283
LUALIB_API int luaL_error(lua_State *L, const char *fmt,...)
Definition: lauxlib.cpp:234
LUALIB_API void luaL_checkany(lua_State *L, int arg)
Definition: lauxlib.cpp:396
int luaL_typeerror(lua_State *L, int arg, const char *tname)
Definition: lauxlib.cpp:193
char buff[BUFSIZ]
Definition: lauxlib.cpp:689
LUA_API lua_Unsigned lua_rawlen(lua_State *L, int idx)
Definition: lapi.cpp:402
#define LUA_REGISTRYINDEX
Definition: lua.h:44
LUA_API lua_CFunction lua_atpanic(lua_State *L, lua_CFunction panicf)
Definition: lapi.cpp:136
static void newbox(lua_State *L)
Definition: lauxlib.cpp:501
LUA_API int lua_error(lua_State *L)
Definition: lapi.cpp:1205
static int lastlevel(lua_State *L)
Definition: lauxlib.cpp:116
LUA_API const void * lua_topointer(lua_State *L, int idx)
Definition: lapi.cpp:451
LUALIB_API char * luaL_buffinitsize(lua_State *L, luaL_Buffer *B, size_t sz)
Definition: lauxlib.cpp:628
double t
Definition: astarsearch.cpp:65
#define lua_istable(L, n)
Definition: lua.h:373
LUA_API void lua_concat(lua_State *L, int n)
Definition: lapi.cpp:1253
#define lua_writestringerror(s, p)
Definition: lauxlib.h:245
LUALIB_API int luaL_execresult(lua_State *L, int stat)
Definition: lauxlib.cpp:285
static int skipBOM(LoadF *lf)
Definition: lauxlib.cpp:720
static int panic(lua_State *L)
Definition: lauxlib.cpp:999
#define LUAL_NUMSIZES
Definition: lauxlib.h:43
static void pushfuncname(lua_State *L, lua_Debug *ar)
Definition: lauxlib.cpp:100
LUALIB_API void luaL_unref(lua_State *L, int t, int ref)
Definition: lauxlib.cpp:667
LUA_API const char * lua_pushfstring(lua_State *L, const char *fmt,...)
Definition: lapi.cpp:542
void lua_setwarnf(lua_State *L, lua_WarnFunction f, void *ud)
Definition: lapi.cpp:1295
char * b
Definition: lauxlib.h:167
int currentline
Definition: lua.h:476
LUA_API void lua_copy(lua_State *L, int fromidx, int toidx)
Definition: lapi.cpp:231
LUALIB_API void luaL_setfuncs(lua_State *L, const luaL_Reg *l, int nup)
Definition: lauxlib.cpp:904
static int findfield(lua_State *L, int objidx, int level)
Definition: lauxlib.cpp:52
mock_char c
LUALIB_API void luaL_checkversion_(lua_State *L, lua_Number ver, size_t sz)
Definition: lauxlib.cpp:1075
LUA_API int lua_getfield(lua_State *L, int idx, const char *k)
Definition: lapi.cpp:655
#define LUA_TTABLE
Definition: lua.h:70
static map_location::DIRECTION n
LUA_API void lua_pushinteger(lua_State *L, lua_Integer n)
Definition: lapi.cpp:489
static size_t newbuffsize(luaL_Buffer *B, size_t sz)
Definition: lauxlib.cpp:522
#define luaL_optstring(L, n, d)
Definition: lauxlib.h:139
struct LoadS LoadS
LUALIB_API const char * luaL_checklstring(lua_State *L, int arg, size_t *len)
Definition: lauxlib.cpp:402
LUA_NUMBER lua_Number
Definition: lua.h:90
LUA_API const char * lua_pushstring(lua_State *L, const char *s)
Definition: lapi.cpp:514
LUA_API void lua_setfield(lua_State *L, int idx, const char *k)
Definition: lapi.cpp:837
#define LUA_TBOOLEAN
Definition: lua.h:66
LUA_API int lua_next(lua_State *L, int idx)
Definition: lapi.cpp:1220
#define LUA_REFNIL
Definition: lauxlib.h:86
LUA_API const char * lua_typename(lua_State *L, int t)
Definition: lapi.cpp:266
LUALIB_API lua_Number luaL_optnumber(lua_State *L, int arg, lua_Number def)
Definition: lauxlib.cpp:429
static void warnfon(void *ud, const char *message, int tocont)
Definition: lauxlib.cpp:1057
int linedefined
Definition: lua.h:477
#define LUALIB_API
Definition: luaconf.h:285
#define luaL_checkstring(L, n)
Definition: lauxlib.h:138
size_t bsize
Definition: lauxlib.cpp:469