lauxlib.c

   1 /*
   2 ** $Id: lauxlib.c,v 1.159.1.3 2008/01/21 13:20:51 roberto Exp $
   3 ** Auxiliary functions for building Lua libraries
   4 ** See Copyright Notice in lua.h
   5 */
   6
   7 #if 0
   8 #include <ctype.h>
   9 #include <errno.h>
  10 #include <stdarg.h>
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #endif
  15
  16 #include <grub/file.h>
  17
  18 /* This file uses only the official API of Lua.
  19 ** Any function declared here could be written as an application function.
  20 */
  21
  22 #define lauxlib_c
  23 #define LUA_LIB
  24
  25 #include "lua.h"
  26
  27 #include "lauxlib.h"
  28
  29
  30 #define FREELIST_REF    0       /* free list of references */
  31
  32
  33 /* convert a stack index to positive */
  34 #define abs_index(L, i)         ((i) > 0 || (i) <= LUA_REGISTRYINDEX ? (i) : \
  35                                         lua_gettop(L) + (i) + 1)
  36
  37
  38 /*
  39 ** {======================================================
  40 ** Error-report functions
  41 ** =======================================================
  42 */
  43
  44
  45 LUALIB_API int luaL_argerror (lua_State *L, int narg, const char *extramsg) {
  46   lua_Debug ar;
  47   if (!lua_getstack(L, 0, &ar))  /* no stack frame? */
  48     return luaL_error(L, "bad argument #%d (%s)", narg, extramsg);
  49   lua_getinfo(L, "n", &ar);
  50   if (strcmp(ar.namewhat, "method") == 0) {
  51     narg--;  /* do not count `self' */
  52     if (narg == 0)  /* error is in the self argument itself? */
  53       return luaL_error(L, "calling " LUA_QS " on bad self (%s)",
  54                            ar.name, extramsg);
  55   }
  56   if (ar.name == NULL)
  57     ar.name = "?";
  58   return luaL_error(L, "bad argument #%d to " LUA_QS " (%s)",
  59                         narg, ar.name, extramsg);
  60 }
  61
  62
  63 LUALIB_API int luaL_typerror (lua_State *L, int narg, const char *tname) {
  64   const char *msg = lua_pushfstring(L, "%s expected, got %s",
  65                                     tname, luaL_typename(L, narg));
  66   return luaL_argerror(L, narg, msg);
  67 }
  68
  69
  70 static void tag_error (lua_State *L, int narg, int tag) {
  71   luaL_typerror(L, narg, lua_typename(L, tag));
  72 }
  73
  74
  75 LUALIB_API void luaL_where (lua_State *L, int level) {
  76   lua_Debug ar;
  77   if (lua_getstack(L, level, &ar)) {  /* check function at level */
  78     lua_getinfo(L, "Sl", &ar);  /* get info about it */
  79     if (ar.currentline > 0) {  /* is there info? */
  80       lua_pushfstring(L, "%s:%d: ", ar.short_src, ar.currentline);
  81       return;
  82     }
  83   }
  84   lua_pushliteral(L, "");  /* else, no information available... */
  85 }
  86
  87
  88 LUALIB_API int luaL_error (lua_State *L, const char *fmt, ...) {
  89   va_list argp;
  90   va_start(argp, fmt);
  91   luaL_where(L, 1);
  92   lua_pushvfstring(L, fmt, argp);
  93   va_end(argp);
  94   lua_concat(L, 2);
  95   return lua_error(L);
  96 }
  97
  98 /* }====================================================== */
  99
 100
 101 LUALIB_API int luaL_checkoption (lua_State *L, int narg, const char *def,
 102                                  const char *const lst[]) {
 103   const char *name = (def) ? luaL_optstring(L, narg, def) :
 104                              luaL_checkstring(L, narg);
 105   int i;
 106   for (i=0; lst[i]; i++)
 107     if (strcmp(lst[i], name) == 0)
 108       return i;
 109   return luaL_argerror(L, narg,
 110                        lua_pushfstring(L, "invalid option " LUA_QS, name));
 111 }
 112
 113
 114 LUALIB_API int luaL_newmetatable (lua_State *L, const char *tname) {
 115   lua_getfield(L, LUA_REGISTRYINDEX, tname);  /* get registry.name */
 116   if (!lua_isnil(L, -1))  /* name already in use? */
 117     return 0;  /* leave previous value on top, but return 0 */
 118   lua_pop(L, 1);
 119   lua_newtable(L);  /* create metatable */
 120   lua_pushvalue(L, -1);
 121   lua_setfield(L, LUA_REGISTRYINDEX, tname);  /* registry.name = metatable */
 122   return 1;
 123 }
 124
 125
 126 LUALIB_API void *luaL_checkudata (lua_State *L, int ud, const char *tname) {
 127   void *p = lua_touserdata(L, ud);
 128   if (p != NULL) {  /* value is a userdata? */
 129     if (lua_getmetatable(L, ud)) {  /* does it have a metatable? */
 130       lua_getfield(L, LUA_REGISTRYINDEX, tname);  /* get correct metatable */
 131       if (lua_rawequal(L, -1, -2)) {  /* does it have the correct mt? */
 132         lua_pop(L, 2);  /* remove both metatables */
 133         return p;
 134       }
 135     }
 136   }
 137   luaL_typerror(L, ud, tname);  /* else error */
 138   return NULL;  /* to avoid warnings */
 139 }
 140
 141
 142 LUALIB_API void luaL_checkstack (lua_State *L, int space, const char *mes) {
 143   if (!lua_checkstack(L, space))
 144     luaL_error(L, "stack overflow (%s)", mes);
 145 }
 146
 147
 148 LUALIB_API void luaL_checktype (lua_State *L, int narg, int t) {
 149   if (lua_type(L, narg) != t)
 150     tag_error(L, narg, t);
 151 }
 152
 153
 154 LUALIB_API void luaL_checkany (lua_State *L, int narg) {
 155   if (lua_type(L, narg) == LUA_TNONE)
 156     luaL_argerror(L, narg, "value expected");
 157 }
 158
 159
 160 LUALIB_API const char *luaL_checklstring (lua_State *L, int narg, size_t *len) {
 161   const char *s = lua_tolstring(L, narg, len);
 162   if (!s) tag_error(L, narg, LUA_TSTRING);
 163   return s;
 164 }
 165
 166
 167 LUALIB_API const char *luaL_optlstring (lua_State *L, int narg,
 168                                         const char *def, size_t *len) {
 169   if (lua_isnoneornil(L, narg)) {
 170     if (len)
 171       *len = (def ? strlen(def) : 0);
 172     return def;
 173   }
 174   else return luaL_checklstring(L, narg, len);
 175 }
 176
 177
 178 LUALIB_API lua_Number luaL_checknumber (lua_State *L, int narg) {
 179   lua_Number d = lua_tonumber(L, narg);
 180   if (d == 0 && !lua_isnumber(L, narg))  /* avoid extra test when d is not 0 */
 181     tag_error(L, narg, LUA_TNUMBER);
 182   return d;
 183 }
 184
 185
 186 LUALIB_API lua_Number luaL_optnumber (lua_State *L, int narg, lua_Number def) {
 187   return luaL_opt(L, luaL_checknumber, narg, def);
 188 }
 189
 190
 191 LUALIB_API lua_Integer luaL_checkinteger (lua_State *L, int narg) {
 192   lua_Integer d = lua_tointeger(L, narg);
 193   if (d == 0 && !lua_isnumber(L, narg))  /* avoid extra test when d is not 0 */
 194     tag_error(L, narg, LUA_TNUMBER);
 195   return d;
 196 }
 197
 198
 199 LUALIB_API lua_Integer luaL_optinteger (lua_State *L, int narg,
 200                                                       lua_Integer def) {
 201   return luaL_opt(L, luaL_checkinteger, narg, def);
 202 }
 203
 204
 205 LUALIB_API int luaL_getmetafield (lua_State *L, int obj, const char *event) {
 206   if (!lua_getmetatable(L, obj))  /* no metatable? */
 207     return 0;
 208   lua_pushstring(L, event);
 209   lua_rawget(L, -2);
 210   if (lua_isnil(L, -1)) {
 211     lua_pop(L, 2);  /* remove metatable and metafield */
 212     return 0;
 213   }
 214   else {
 215     lua_remove(L, -2);  /* remove only metatable */
 216     return 1;
 217   }
 218 }
 219
 220
 221 LUALIB_API int luaL_callmeta (lua_State *L, int obj, const char *event) {
 222   obj = abs_index(L, obj);
 223   if (!luaL_getmetafield(L, obj, event))  /* no metafield? */
 224     return 0;
 225   lua_pushvalue(L, obj);
 226   lua_call(L, 1, 1);
 227   return 1;
 228 }
 229
 230
 231 LUALIB_API void (luaL_register) (lua_State *L, const char *libname,
 232                                 const luaL_Reg *l) {
 233   luaI_openlib(L, libname, l, 0);
 234 }
 235
 236
 237 static int libsize (const luaL_Reg *l) {
 238   int size = 0;
 239   for (; l->name; l++) size++;
 240   return size;
 241 }
 242
 243
 244 LUALIB_API void luaI_openlib (lua_State *L, const char *libname,
 245                               const luaL_Reg *l, int nup) {
 246   if (libname) {
 247     int size = libsize(l);
 248     /* check whether lib already exists */
 249     luaL_findtable(L, LUA_REGISTRYINDEX, "_LOADED", 1);
 250     lua_getfield(L, -1, libname);  /* get _LOADED[libname] */
 251     if (!lua_istable(L, -1)) {  /* not found? */
 252       lua_pop(L, 1);  /* remove previous result */
 253       /* try global variable (and create one if it does not exist) */
 254       if (luaL_findtable(L, LUA_GLOBALSINDEX, libname, size) != NULL)
 255         luaL_error(L, "name conflict for module " LUA_QS, libname);
 256       lua_pushvalue(L, -1);
 257       lua_setfield(L, -3, libname);  /* _LOADED[libname] = new table */
 258     }
 259     lua_remove(L, -2);  /* remove _LOADED table */
 260     lua_insert(L, -(nup+1));  /* move library table to below upvalues */
 261   }
 262   for (; l->name; l++) {
 263     int i;
 264     for (i=0; i<nup; i++)  /* copy upvalues to the top */
 265       lua_pushvalue(L, -nup);
 266     lua_pushcclosure(L, l->func, nup);
 267     lua_setfield(L, -(nup+2), l->name);
 268   }
 269   lua_pop(L, nup);  /* remove upvalues */
 270 }
 271
 272
 273
 274 /*
 275 ** {======================================================
 276 ** getn-setn: size for arrays
 277 ** =======================================================
 278 */
 279
 280 #if defined(LUA_COMPAT_GETN)
 281
 282 static int checkint (lua_State *L, int topop) {
 283   int n = (lua_type(L, -1) == LUA_TNUMBER) ? lua_tointeger(L, -1) : -1;
 284   lua_pop(L, topop);
 285   return n;
 286 }
 287
 288
 289 static void getsizes (lua_State *L) {
 290   lua_getfield(L, LUA_REGISTRYINDEX, "LUA_SIZES");
 291   if (lua_isnil(L, -1)) {  /* no `size' table? */
 292     lua_pop(L, 1);  /* remove nil */
 293     lua_newtable(L);  /* create it */
 294     lua_pushvalue(L, -1);  /* `size' will be its own metatable */
 295     lua_setmetatable(L, -2);
 296     lua_pushliteral(L, "kv");
 297     lua_setfield(L, -2, "__mode");  /* metatable(N).__mode = "kv" */
 298     lua_pushvalue(L, -1);
 299     lua_setfield(L, LUA_REGISTRYINDEX, "LUA_SIZES");  /* store in register */
 300   }
 301 }
 302
 303
 304 LUALIB_API void luaL_setn (lua_State *L, int t, int n) {
 305   t = abs_index(L, t);
 306   lua_pushliteral(L, "n");
 307   lua_rawget(L, t);
 308   if (checkint(L, 1) >= 0) {  /* is there a numeric field `n'? */
 309     lua_pushliteral(L, "n");  /* use it */
 310     lua_pushinteger(L, n);
 311     lua_rawset(L, t);
 312   }
 313   else {  /* use `sizes' */
 314     getsizes(L);
 315     lua_pushvalue(L, t);
 316     lua_pushinteger(L, n);
 317     lua_rawset(L, -3);  /* sizes[t] = n */
 318     lua_pop(L, 1);  /* remove `sizes' */
 319   }
 320 }
 321
 322
 323 LUALIB_API int luaL_getn (lua_State *L, int t) {
 324   int n;
 325   t = abs_index(L, t);
 326   lua_pushliteral(L, "n");  /* try t.n */
 327   lua_rawget(L, t);
 328   if ((n = checkint(L, 1)) >= 0) return n;
 329   getsizes(L);  /* else try sizes[t] */
 330   lua_pushvalue(L, t);
 331   lua_rawget(L, -2);
 332   if ((n = checkint(L, 2)) >= 0) return n;
 333   return (int)lua_objlen(L, t);
 334 }
 335
 336 #endif
 337
 338 /* }====================================================== */
 339
 340
 341
 342 LUALIB_API const char *luaL_gsub (lua_State *L, const char *s, const char *p,
 343                                                                const char *r) {
 344   const char *wild;
 345   size_t l = strlen(p);
 346   luaL_Buffer b;
 347   luaL_buffinit(L, &b);
 348   while ((wild = strstr(s, p)) != NULL) {
 349     luaL_addlstring(&b, s, wild - s);  /* push prefix */
 350     luaL_addstring(&b, r);  /* push replacement in place of pattern */
 351     s = wild + l;  /* continue after `p' */
 352   }
 353   luaL_addstring(&b, s);  /* push last suffix */
 354   luaL_pushresult(&b);
 355   return lua_tostring(L, -1);
 356 }
 357
 358
 359 LUALIB_API const char *luaL_findtable (lua_State *L, int idx,
 360                                        const char *fname, int szhint) {
 361   const char *e;
 362   lua_pushvalue(L, idx);
 363   do {
 364     e = strchr(fname, '.');
 365     if (e == NULL) e = fname + strlen(fname);
 366     lua_pushlstring(L, fname, e - fname);
 367     lua_rawget(L, -2);
 368     if (lua_isnil(L, -1)) {  /* no such field? */
 369       lua_pop(L, 1);  /* remove this nil */
 370       lua_createtable(L, 0, (*e == '.' ? 1 : szhint)); /* new table for field */
 371       lua_pushlstring(L, fname, e - fname);
 372       lua_pushvalue(L, -2);
 373       lua_settable(L, -4);  /* set new table into field */
 374     }
 375     else if (!lua_istable(L, -1)) {  /* field has a non-table value? */
 376       lua_pop(L, 2);  /* remove table and value */
 377       return fname;  /* return problematic part of the name */
 378     }
 379     lua_remove(L, -2);  /* remove previous table */
 380     fname = e + 1;
 381   } while (*e == '.');
 382   return NULL;
 383 }
 384
 385
 386
 387 /*
 388 ** {======================================================
 389 ** Generic Buffer manipulation
 390 ** =======================================================
 391 */
 392
 393
 394 #define bufflen(B)      ((B)->p - (B)->buffer)
 395 #define bufffree(B)     ((size_t)(LUAL_BUFFERSIZE - bufflen(B)))
 396
 397 #define LIMIT   (LUA_MINSTACK/2)
 398
 399
 400 static int emptybuffer (luaL_Buffer *B) {
 401   size_t l = bufflen(B);
 402   if (l == 0) return 0;  /* put nothing on stack */
 403   else {
 404     lua_pushlstring(B->L, B->buffer, l);
 405     B->p = B->buffer;
 406     B->lvl++;
 407     return 1;
 408   }
 409 }
 410
 411
 412 static void adjuststack (luaL_Buffer *B) {
 413   if (B->lvl > 1) {
 414     lua_State *L = B->L;
 415     int toget = 1;  /* number of levels to concat */
 416     size_t toplen = lua_strlen(L, -1);
 417     do {
 418       size_t l = lua_strlen(L, -(toget+1));
 419       if (B->lvl - toget + 1 >= LIMIT || toplen > l) {
 420         toplen += l;
 421         toget++;
 422       }
 423       else break;
 424     } while (toget < B->lvl);
 425     lua_concat(L, toget);
 426     B->lvl = B->lvl - toget + 1;
 427   }
 428 }
 429
 430
 431 LUALIB_API char *luaL_prepbuffer (luaL_Buffer *B) {
 432   if (emptybuffer(B))
 433     adjuststack(B);
 434   return B->buffer;
 435 }
 436
 437
 438 LUALIB_API void luaL_addlstring (luaL_Buffer *B, const char *s, size_t l) {
 439   while (l--)
 440     luaL_addchar(B, *s++);
 441 }
 442
 443
 444 LUALIB_API void luaL_addstring (luaL_Buffer *B, const char *s) {
 445   luaL_addlstring(B, s, strlen(s));
 446 }
 447
 448
 449 LUALIB_API void luaL_pushresult (luaL_Buffer *B) {
 450   emptybuffer(B);
 451   lua_concat(B->L, B->lvl);
 452   B->lvl = 1;
 453 }
 454
 455
 456 LUALIB_API void luaL_addvalue (luaL_Buffer *B) {
 457   lua_State *L = B->L;
 458   size_t vl;
 459   const char *s = lua_tolstring(L, -1, &vl);
 460   if (vl <= bufffree(B)) {  /* fit into buffer? */
 461     memcpy(B->p, s, vl);  /* put it there */
 462     B->p += vl;
 463     lua_pop(L, 1);  /* remove from stack */
 464   }
 465   else {
 466     if (emptybuffer(B))
 467       lua_insert(L, -2);  /* put buffer before new value */
 468     B->lvl++;  /* add new value into B stack */
 469     adjuststack(B);
 470   }
 471 }
 472
 473
 474 LUALIB_API void luaL_buffinit (lua_State *L, luaL_Buffer *B) {
 475   B->L = L;
 476   B->p = B->buffer;
 477   B->lvl = 0;
 478 }
 479
 480 /* }====================================================== */
 481
 482
 483 LUALIB_API int luaL_ref (lua_State *L, int t) {
 484   int ref;
 485   t = abs_index(L, t);
 486   if (lua_isnil(L, -1)) {
 487     lua_pop(L, 1);  /* remove from stack */
 488     return LUA_REFNIL;  /* `nil' has a unique fixed reference */
 489   }
 490   lua_rawgeti(L, t, FREELIST_REF);  /* get first free element */
 491   ref = (int)lua_tointeger(L, -1);  /* ref = t[FREELIST_REF] */
 492   lua_pop(L, 1);  /* remove it from stack */
 493   if (ref != 0) {  /* any free element? */
 494     lua_rawgeti(L, t, ref);  /* remove it from list */
 495     lua_rawseti(L, t, FREELIST_REF);  /* (t[FREELIST_REF] = t[ref]) */
 496   }
 497   else {  /* no free elements */
 498     ref = (int)lua_objlen(L, t);
 499     ref++;  /* create new reference */
 500   }
 501   lua_rawseti(L, t, ref);
 502   return ref;
 503 }
 504
 505
 506 LUALIB_API void luaL_unref (lua_State *L, int t, int ref) {
 507   if (ref >= 0) {
 508     t = abs_index(L, t);
 509     lua_rawgeti(L, t, FREELIST_REF);
 510     lua_rawseti(L, t, ref);  /* t[ref] = t[FREELIST_REF] */
 511     lua_pushinteger(L, ref);
 512     lua_rawseti(L, t, FREELIST_REF);  /* t[FREELIST_REF] = ref */
 513   }
 514 }
 515
 516
 517
 518 /*
 519 ** {======================================================
 520 ** Load functions
 521 ** =======================================================
 522 */
 523
 524 #define GRUB_EOF        -1
 525
 526 static int
 527 grub_getc (grub_file_t file)
 528 {
 529   grub_uint8_t c = 0;
 530
 531   return (grub_file_read (file, &c, 1) != 1) ? GRUB_EOF : c;
 532     return GRUB_EOF;
 533 }
 534
 535 #define grub_eof(file)  (file->offset >= file->size)
 536
 537 typedef struct LoadF {
 538   int extraline;
 539   grub_file_t f;
 540   int ungetc;
 541   char buff[LUAL_BUFFERSIZE];
 542 } LoadF;
 543
 544
 545 static const char *getF (lua_State *L, void *ud, size_t *size) {
 546   LoadF *lf = (LoadF *)ud;
 547   char *p;
 548   int s;
 549   (void)L;
 550   if (lf->extraline) {
 551     lf->extraline = 0;
 552     *size = 1;
 553     return "\n";
 554   }
 555   s = sizeof (lf->buff);
 556   p = lf->buff;
 557   if (lf->ungetc >= 0)
 558     {
 559       lf->buff[0] = lf->ungetc;
 560       lf->ungetc = -1;
 561       s--;
 562       p++;
 563     }
 564
 565   if (grub_eof(lf->f)) return NULL;
 566   s = grub_file_read(lf->f, p, s);
 567   if (s <= 0)
 568     return NULL;
 569
 570   *size = s + (p - lf->buff);
 571   return (*size > 0) ? lf->buff : NULL;
 572 }
 573
 574 static int errfile (lua_State *L, const char *what, int fnameindex) {
 575   const char *serr = grub_errmsg;
 576   const char *filename = lua_tostring(L, fnameindex) + 1;
 577   lua_pushfstring(L, "cannot %s %s: %s", what, filename, serr);
 578   lua_remove(L, fnameindex);
 579   return LUA_ERRFILE;
 580 }
 581
 582 LUALIB_API int luaL_loadfile (lua_State *L, const char *filename) {
 583   LoadF lf;
 584   int status, readstatus;
 585   int c;
 586   int fnameindex = lua_gettop(L) + 1;  /* index of filename on the stack */
 587   lf.extraline = 0;
 588   if (filename == NULL) {
 589     lua_pushliteral(L, "=stdin");
 590     return errfile(L, "open", fnameindex);
 591   }
 592   else {
 593     lua_pushfstring(L, "@%s", filename);
 594     lf.f = grub_file_open(filename);
 595     if (lf.f == NULL) return errfile(L, "open", fnameindex);
 596   }
 597
 598   c = grub_getc(lf.f);
 599   if (c == '#') {  /* Unix exec. file? */
 600     lf.extraline = 1;
 601     while ((c = grub_getc(lf.f)) != GRUB_EOF && c != '\n') ;  /* skip first line */
 602     if (c == '\n') c = grub_getc(lf.f);
 603   }
 604   if (c == LUA_SIGNATURE[0] && filename) {  /* binary file? */
 605     /* skip eventual `#!...' */
 606    while ((c = grub_getc(lf.f)) != GRUB_EOF && c != LUA_SIGNATURE[0]) ;
 607     lf.extraline = 0;
 608   }
 609   lf.ungetc = c;
 610   status = lua_load(L, getF, &lf, lua_tostring(L, -1));
 611   readstatus = grub_errno;
 612   grub_file_close(lf.f);  /* close file (even in case of errors) */
 613   if (readstatus) {
 614     lua_settop(L, fnameindex);  /* ignore results from `lua_load' */
 615     return errfile(L, "read", fnameindex);
 616   }
 617   lua_remove(L, fnameindex);
 618   return status;
 619 }
 620
 621 typedef struct LoadS {
 622   const char *s;
 623   size_t size;
 624 } LoadS;
 625
 626
 627 static const char *getS (lua_State *L, void *ud, size_t *size) {
 628   LoadS *ls = (LoadS *)ud;
 629   (void)L;
 630   if (ls->size == 0) return NULL;
 631   *size = ls->size;
 632   ls->size = 0;
 633   return ls->s;
 634 }
 635
 636
 637 LUALIB_API int luaL_loadbuffer (lua_State *L, const char *buff, size_t size,
 638                                 const char *name) {
 639   LoadS ls;
 640   ls.s = buff;
 641   ls.size = size;
 642   return lua_load(L, getS, &ls, name);
 643 }
 644
 645
 646 LUALIB_API int (luaL_loadstring) (lua_State *L, const char *s) {
 647   return luaL_loadbuffer(L, s, strlen(s), s);
 648 }
 649
 650
 651
 652 /* }====================================================== */
 653
 654
 655 static void *l_alloc (void *ud, void *ptr, size_t osize, size_t nsize) {
 656   (void)ud;
 657   (void)osize;
 658   if (nsize == 0) {
 659     free(ptr);
 660     return NULL;
 661   }
 662   else
 663     return realloc(ptr, nsize);
 664 }
 665
 666
 667 static int panic (lua_State *L) {
 668   (void)L;  /* to avoid warnings */
 669 #if 0
 670   fprintf(stderr, "PANIC: unprotected error in call to Lua API (%s)\n",
 671                    lua_tostring(L, -1));
 672 #else
 673   grub_fatal ("PANIC: unprotected error in call to Lua API (%s)\n",
 674               lua_tostring(L, -1));
 675 #endif
 676   return 0;
 677 }
 678
 679
 680 LUALIB_API lua_State *luaL_newstate (void) {
 681   lua_State *L = lua_newstate(l_alloc, NULL);
 682   if (L) lua_atpanic(L, &panic);
 683   return L;
 684 }
 685