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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
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#include "lstring.h" /* ROCKLUA ADDED */
15
16/* This file uses only the official API of Lua.
17** Any function declared here could be written as an application function.
18** Note ** luaS_newlloc breaks this guarantee ROCKLUA ADDED
19*/
20
21#define lauxlib_c
22#define LUA_LIB
23
24#include "lua.h"
25
26#include "lauxlib.h"
27
28
29#define FREELIST_REF 0 /* free list of references */
30
31
32/* convert a stack index to positive */
33#define abs_index(L, i) ((i) > 0 || (i) <= LUA_REGISTRYINDEX ? (i) : \
34 lua_gettop(L) + (i) + 1)
35
36#ifndef LUA_OOM
37 #define LUA_OOM(L) {}
38#endif
39/*
40** {======================================================
41** Error-report functions
42** =======================================================
43*/
44
45
46LUALIB_API int luaL_argerror (lua_State *L, int narg, const char *extramsg) {
47 lua_Debug ar;
48 if (!lua_getstack(L, 0, &ar)) /* no stack frame? */
49 return luaL_error(L, "bad argument #%d (%s)", narg, extramsg);
50 lua_getinfo(L, "n", &ar);
51 if (strcmp(ar.namewhat, "method") == 0) {
52 narg--; /* do not count `self' */
53 if (narg == 0) /* error is in the self argument itself? */
54 return luaL_error(L, "calling " LUA_QS " on bad self (%s)",
55 ar.name, extramsg);
56 }
57 if (ar.name == NULL)
58 ar.name = "?";
59 return luaL_error(L, "bad argument #%d to " LUA_QS " (%s)",
60 narg, ar.name, extramsg);
61}
62
63
64LUALIB_API int luaL_typerror (lua_State *L, int narg, const char *tname) {
65 const char *msg = lua_pushfstring(L, "%s expected, got %s",
66 tname, luaL_typename(L, narg));
67 return luaL_argerror(L, narg, msg);
68}
69
70
71static void tag_error (lua_State *L, int narg, int tag) {
72 luaL_typerror(L, narg, lua_typename(L, tag));
73}
74
75
76LUALIB_API void luaL_where (lua_State *L, int level) {
77 lua_Debug ar;
78 if (lua_getstack(L, level, &ar)) { /* check function at level */
79 lua_getinfo(L, "Sl", &ar); /* get info about it */
80 if (ar.currentline > 0) { /* is there info? */
81 lua_pushfstring(L, "%s:%d: ", ar.short_src, ar.currentline);
82 return;
83 }
84 }
85 lua_pushliteral(L, ""); /* else, no information available... */
86}
87
88
89LUALIB_API int luaL_error (lua_State *L, const char *fmt, ...) {
90 va_list argp;
91 va_start(argp, fmt);
92 luaL_where(L, 1);
93 lua_pushvfstring(L, fmt, argp);
94 va_end(argp);
95 lua_concat(L, 2);
96 return lua_error(L);
97}
98
99/* }====================================================== */
100
101
102LUALIB_API int luaL_checkoption (lua_State *L, int narg, const char *def,
103 const char *const lst[]) {
104 const char *name = (def) ? luaL_optstring(L, narg, def) :
105 luaL_checkstring(L, narg);
106 int i;
107 for (i=0; lst[i]; i++)
108 if (strcmp(lst[i], name) == 0)
109 return i;
110 return luaL_argerror(L, narg,
111 lua_pushfstring(L, "invalid option " LUA_QS, name));
112}
113
114
115LUALIB_API int luaL_newmetatable (lua_State *L, const char *tname) {
116 lua_getfield(L, LUA_REGISTRYINDEX, tname); /* get registry.name */
117 if (!lua_isnil(L, -1)) /* name already in use? */
118 return 0; /* leave previous value on top, but return 0 */
119 lua_pop(L, 1);
120 lua_newtable(L); /* create metatable */
121 lua_pushvalue(L, -1);
122 lua_setfield(L, LUA_REGISTRYINDEX, tname); /* registry.name = metatable */
123 return 1;
124}
125
126
127LUALIB_API void *luaL_checkudata (lua_State *L, int ud, const char *tname) {
128 void *p = lua_touserdata(L, ud);
129 if (p != NULL) { /* value is a userdata? */
130 if (lua_getmetatable(L, ud)) { /* does it have a metatable? */
131 lua_getfield(L, LUA_REGISTRYINDEX, tname); /* get correct metatable */
132 if (lua_rawequal(L, -1, -2)) { /* does it have the correct mt? */
133 lua_pop(L, 2); /* remove both metatables */
134 return p;
135 }
136 }
137 }
138 luaL_typerror(L, ud, tname); /* else error */
139 return NULL; /* to avoid warnings */
140}
141
142
143LUALIB_API void luaL_checkstack (lua_State *L, int space, const char *mes) {
144 if (!lua_checkstack(L, space))
145 luaL_error(L, "stack overflow (%s)", mes);
146}
147
148
149LUALIB_API void luaL_checktype (lua_State *L, int narg, int t) {
150 if (lua_type(L, narg) != t)
151 tag_error(L, narg, t);
152}
153
154
155LUALIB_API void luaL_checkany (lua_State *L, int narg) {
156 if (lua_type(L, narg) == LUA_TNONE)
157 luaL_argerror(L, narg, "value expected");
158}
159
160
161LUALIB_API const char *luaL_checklstring (lua_State *L, int narg, size_t *len) {
162 const char *s = lua_tolstring(L, narg, len);
163 if (!s) tag_error(L, narg, LUA_TSTRING);
164 return s;
165}
166
167
168LUALIB_API const char *luaL_optlstring (lua_State *L, int narg,
169 const char *def, size_t *len) {
170 if (lua_isnoneornil(L, narg)) {
171 if (len)
172 *len = (def ? strlen(def) : 0);
173 return def;
174 }
175 else return luaL_checklstring(L, narg, len);
176}
177
178
179LUALIB_API lua_Number luaL_checknumber (lua_State *L, int narg) {
180 lua_Number d = lua_tonumber(L, narg);
181 if (d == 0 && !lua_isnumber(L, narg)) /* avoid extra test when d is not 0 */
182 tag_error(L, narg, LUA_TNUMBER);
183 return d;
184}
185
186
187LUALIB_API lua_Number luaL_optnumber (lua_State *L, int narg, lua_Number def) {
188 return luaL_opt(L, luaL_checknumber, narg, def);
189}
190
191
192LUALIB_API lua_Integer luaL_checkinteger (lua_State *L, int narg) {
193 lua_Integer d = lua_tointeger(L, narg);
194 if (d == 0 && !lua_isnumber(L, narg)) /* avoid extra test when d is not 0 */
195 tag_error(L, narg, LUA_TNUMBER);
196 return d;
197}
198
199
200LUALIB_API lua_Integer luaL_optinteger (lua_State *L, int narg,
201 lua_Integer def) {
202 return luaL_opt(L, luaL_checkinteger, narg, def);
203}
204
205/* ROCKLUA ADDED */
206LUALIB_API int luaL_checkboolean (lua_State *L, int narg) {
207 int b = lua_toboolean(L, narg);
208 if( b == 0 && !lua_isboolean(L, narg))
209 tag_error(L, narg, LUA_TBOOLEAN);
210 return b;
211}
212
213/* ROCKLUA ADDED */
214LUALIB_API int luaL_optboolean (lua_State *L, int narg, int def) {
215 return luaL_opt(L, luaL_checkboolean, narg, def);
216}
217
218
219LUALIB_API int luaL_getmetafield (lua_State *L, int obj, const char *event) {
220 if (!lua_getmetatable(L, obj)) /* no metatable? */
221 return 0;
222 lua_pushstring(L, event);
223 lua_rawget(L, -2);
224 if (lua_isnil(L, -1)) {
225 lua_pop(L, 2); /* remove metatable and metafield */
226 return 0;
227 }
228 else {
229 lua_remove(L, -2); /* remove only metatable */
230 return 1;
231 }
232}
233
234
235LUALIB_API int luaL_callmeta (lua_State *L, int obj, const char *event) {
236 obj = abs_index(L, obj);
237 if (!luaL_getmetafield(L, obj, event)) /* no metafield? */
238 return 0;
239 lua_pushvalue(L, obj);
240 lua_call(L, 1, 1);
241 return 1;
242}
243
244
245 /* ROCKLUA ADDED */
246static int libsize_storenames (lua_State *L, const char* libname, const luaL_Reg *l) {
247 int size = 0;
248 if (libname)
249 luaS_newlloc(L, libname, TSTR_INBIN);
250 for (; l->name; l++) {
251 size++;
252 luaS_newlloc(L, l->name, TSTR_INBIN);
253 }
254 return size;
255}
256
257
258#if 0
259LUALIB_API void (luaL_register) (lua_State *L, const char *libname,
260 const luaL_Reg *l) {
261 luaI_openlib(L, libname, l, 0);
262}
263#else /* late bind cfunction tables to save ram */
264static int latebind_func_index(lua_State *L)
265{
266 const luaL_Reg *llib;
267 /* name @ top of stack 1(basetable;name)-1*/
268 const char *name = lua_tostring(L, -1);
269
270 lua_pushstring (L, "__latebind");/* basetable;name;__latebind;*/
271 if(lua_istable(L, -3))
272 lua_rawget (L, -3);/* basetable;name;__latebind(t);*/
273
274 luaL_argcheck(L, lua_istable(L, -3) && lua_istable(L, -1), 1,
275 "__latebind table expected");
276 /* (btable;name;__latebind(t)) */
277
278 /* lookup late bound func(s), lua_objlen allows check of multiple luaL_Reg */
279 for(int i = lua_objlen(L, -1); i > 0; i--) {
280 lua_rawgeti (L, -1, i);/* btable;name;__lb(t);llib*/
281 llib = (const luaL_Reg *) lua_touserdata (L, -1);
282 lua_pop(L, 1); /* (btable;name;__lb(t);llib) -> (btable;name;__lb(t)) */
283
284 if(!llib)
285 continue;
286
287 for (; llib->name; llib++) {
288 if(!name || strcmp(name, llib->name) == 0) {
289 /* don't overwrite existing keys within basetable */
290 lua_pushstring(L, llib->name); /* (btable;name;__lb(t);llib->name) */
291 lua_rawget(L, -4); /* (btable;name;__lb(t);btable[func]?) */
292
293 if(lua_isnil(L, -1)) {
294 /* if function is used it is added to the base table */
295 lua_pop(L, 1);
296 lua_pushcclosure(L, llib->func, 0); /* (btable;name;__lb(t);llib->func) */
297 }
298
299 if(!name) /* nil name binds all functions in table immediately */
300 lua_setfield(L, -4, llib->name); /* (btable;name;mtable) */
301 else {
302 lua_pushvalue(L, -1); /* dupe closure or existing func */
303 /* (btable;name;__lb(t);llib->func;llib->func) */
304 lua_setfield(L, -5, llib->name); /* (btable;name;__lb(t);llib->func) */
305 /* returns the closure */
306 return 1;
307 }
308 }
309 }
310 }
311
312 lua_pop(L, 2); /* (btable;name;__lb(t)) -> (btable) */
313 if(!name) {
314 lua_pushnil(L); /* remove metatable (btable;name;__lb(t);nil)*/
315 lua_setmetatable(L, -2);
316 lua_pushnil(L); /* remove __latebind table*/
317 lua_setfield (L, -2, "__latebind");
318 }
319
320 return 0;
321}
322
323
324static int latebind_func_pairs(lua_State *L)
325{
326 /* basetable @ top of stack 1(basetable)-1 */
327 luaL_argcheck(L, lua_istable(L, 1), 1, "table expected");
328
329#if 0
330 lua_getglobal(L, "next"); /* function to be called / returned (btable;next) */
331 lua_createtable(L, 0, 15); /* btable;next;newtable; */
332 lua_pushnil(L); /* nil name retrieves all unbound latebound functions */
333 lua_pushnil(L); /* first key */
334#else
335 /* this way is more RAM efficient in testing */
336 if(luaL_dostring(L, "return next, {}, nil, nil")!= 0)
337 lua_error(L);
338#endif
339 /* (btable;next;ntable;nil;nil) */
340 /* clone base table */
341 while(lua_next(L, 1) > 0) {
342 /* (btable;next;ntable;nil;k;v) */
343 lua_pushvalue(L, -2); /* dupe key Stk = (..;k;v -> ..k;v;k)*/
344 lua_insert(L, -2); /* Stk = (..k;k;v) */
345 lua_rawset(L, -5); /* btable;next;ntable;nil;k */
346 }
347 /* fill the new table with all the latebound functions */
348 /* nil name retrieves all unbound latebound functions */
349 latebind_func_index(L);/* (btable;next;ntable;nil) -> (btable;next;ntable) */
350 lua_pushnil(L); /*nil initial key for next*/
351 /* stack = (btable;next;ntable;nil) */
352 return 3; /*(next,ntable,nil)*/
353}
354
355
356LUALIB_API void (luaL_register) (lua_State *L, const char *libname,
357 const luaL_Reg *l) {
358 if(!libname)
359 {
360 /* if there is no libname register normally */
361 luaI_openlib(L, libname, l, 0);
362 return;
363 }
364
365 /* store empty table instead of passed luaL_Reg table */
366 static const struct luaL_reg late_lib [] =
367 {
368 {NULL, NULL}
369 };
370
371 static const struct luaL_reg late_meta [] =
372 {
373 {"__index", latebind_func_index},
374 {"__pairs", latebind_func_pairs},
375 {"__call", latebind_func_index}, /* allows t("func") -- nil binds all */
376 {NULL, NULL}
377 };
378
379 libsize_storenames(L, libname, l); /* store func names */
380 luaI_openlib(L, libname, late_lib, 0); /* basetable; */
381
382 luaL_findtable(L, -1,"__latebind", 0); /* create table if doesn't exist */
383 /* basetable;__latebind(t); */
384 /* save pointer to real luaL_reg */
385 lua_pushlightuserdata (L, (void *) l); /*basetable;__lb(t);userdata;*/
386 lua_rawseti(L, -2, lua_objlen(L, -2) + 1); /*lb(t)[n] = userdata */
387
388 lua_pop(L, 1);/* (basetable;__latebind(t)) -> (basetable) */
389
390 if(luaL_newmetatable(L, "META_LATEBIND"))
391 {
392 luaI_openlib(L, NULL, late_meta, 0); /*basetable;metatable*/
393 lua_pushvalue(L, -1); /* dupe the metatable (basetable;mt;mt) */
394 lua_setfield (L, -2, "__metatable"); /* metatable[__metatable] = metatable */
395 }
396
397 lua_setmetatable(L, -2); /* (basetable;mt) -> (basetable+mtable) */
398 /* base table is top of stack (basetable) */
399}
400#endif
401
402#if 0
403static int libsize (const luaL_Reg *l) {
404 int size = 0;
405 for (; l->name; l++) size++;
406 return size;
407}
408#endif
409
410LUALIB_API void luaI_openlib (lua_State *L, const char *libname,
411 const luaL_Reg *l, int nup) {
412 int size = libsize_storenames(L, libname, l);
413 if (libname) {
414 /* check whether lib already exists */
415 luaL_findtable(L, LUA_REGISTRYINDEX, "_LOADED", 1);
416 lua_getfield(L, -1, libname); /* get _LOADED[libname] */
417 if (!lua_istable(L, -1)) { /* not found? */
418 lua_pop(L, 1); /* remove previous result */
419 /* try global variable (and create one if it does not exist) */
420 if (luaL_findtable(L, LUA_GLOBALSINDEX, libname, size) != NULL)
421 luaL_error(L, "name conflict for module " LUA_QS, libname);
422 lua_pushvalue(L, -1);
423 lua_setfield(L, -3, libname); /* _LOADED[libname] = new table */
424 }
425 lua_remove(L, -2); /* remove _LOADED table */
426 lua_insert(L, -(nup+1)); /* move library table to below upvalues */
427 }
428 for (; l->name; l++) {
429 int i;
430 for (i=0; i<nup; i++) /* copy upvalues to the top */
431 lua_pushvalue(L, -nup);
432 lua_pushcclosure(L, l->func, nup);
433 lua_setfield(L, -(nup+2), l->name);
434 }
435 lua_pop(L, nup); /* remove upvalues */
436}
437
438
439
440/*
441** {======================================================
442** getn-setn: size for arrays
443** =======================================================
444*/
445
446#if defined(LUA_COMPAT_GETN)
447
448static int checkint (lua_State *L, int topop) {
449 int n = (lua_type(L, -1) == LUA_TNUMBER) ? lua_tointeger(L, -1) : -1;
450 lua_pop(L, topop);
451 return n;
452}
453
454
455static void getsizes (lua_State *L) {
456 lua_getfield(L, LUA_REGISTRYINDEX, "LUA_SIZES");
457 if (lua_isnil(L, -1)) { /* no `size' table? */
458 lua_pop(L, 1); /* remove nil */
459 lua_newtable(L); /* create it */
460 lua_pushvalue(L, -1); /* `size' will be its own metatable */
461 lua_setmetatable(L, -2);
462 lua_pushliteral(L, "kv");
463 lua_setfield(L, -2, "__mode"); /* metatable(N).__mode = "kv" */
464 lua_pushvalue(L, -1);
465 lua_setfield(L, LUA_REGISTRYINDEX, "LUA_SIZES"); /* store in register */
466 }
467}
468
469
470LUALIB_API void luaL_setn (lua_State *L, int t, int n) {
471 t = abs_index(L, t);
472 lua_pushliteral(L, "n");
473 lua_rawget(L, t);
474 if (checkint(L, 1) >= 0) { /* is there a numeric field `n'? */
475 lua_pushliteral(L, "n"); /* use it */
476 lua_pushinteger(L, n);
477 lua_rawset(L, t);
478 }
479 else { /* use `sizes' */
480 getsizes(L);
481 lua_pushvalue(L, t);
482 lua_pushinteger(L, n);
483 lua_rawset(L, -3); /* sizes[t] = n */
484 lua_pop(L, 1); /* remove `sizes' */
485 }
486}
487
488
489LUALIB_API int luaL_getn (lua_State *L, int t) {
490 int n;
491 t = abs_index(L, t);
492 lua_pushliteral(L, "n"); /* try t.n */
493 lua_rawget(L, t);
494 if ((n = checkint(L, 1)) >= 0) return n;
495 getsizes(L); /* else try sizes[t] */
496 lua_pushvalue(L, t);
497 lua_rawget(L, -2);
498 if ((n = checkint(L, 2)) >= 0) return n;
499 return (int)lua_objlen(L, t);
500}
501
502#endif
503
504/* }====================================================== */
505
506
507
508LUALIB_API const char *luaL_gsub (lua_State *L, const char *s, const char *p,
509 const char *r) {
510 const char *wild;
511 size_t l = strlen(p);
512 luaL_Buffer b;
513 luaL_buffinit(L, &b);
514 while ((wild = strstr(s, p)) != NULL) {
515 luaL_addlstring(&b, s, wild - s); /* push prefix */
516 luaL_addstring(&b, r); /* push replacement in place of pattern */
517 s = wild + l; /* continue after `p' */
518 }
519 luaL_addstring(&b, s); /* push last suffix */
520 luaL_pushresult(&b);
521 return lua_tostring(L, -1);
522}
523
524
525LUALIB_API const char *luaL_findtable (lua_State *L, int idx,
526 const char *fname, int szhint) {
527 const char *e;
528 lua_pushvalue(L, idx);
529 do {
530 e = strchr(fname, '.');
531 if (e == NULL) e = fname + strlen(fname);
532 lua_pushlstring(L, fname, e - fname);
533 lua_rawget(L, -2);
534 if (lua_isnil(L, -1)) { /* no such field? */
535 lua_pop(L, 1); /* remove this nil */
536 lua_createtable(L, 0, (*e == '.' ? 1 : szhint)); /* new table for field */
537 lua_pushlstring(L, fname, e - fname);
538 lua_pushvalue(L, -2);
539 lua_settable(L, -4); /* set new table into field */
540 }
541 else if (!lua_istable(L, -1)) { /* field has a non-table value? */
542 lua_pop(L, 2); /* remove table and value */
543 return fname; /* return problematic part of the name */
544 }
545 lua_remove(L, -2); /* remove previous table */
546 fname = e + 1;
547 } while (*e == '.');
548 return NULL;
549}
550
551
552
553/*
554** {======================================================
555** Generic Buffer manipulation
556** =======================================================
557*/
558
559
560#define bufflen(B) ((B)->p - (B)->buffer)
561#define bufffree(B) ((size_t)(LUAL_BUFFERSIZE - bufflen(B)))
562
563#define LIMIT (LUA_MINSTACK/2)
564
565
566static int emptybuffer (luaL_Buffer *B) {
567 size_t l = bufflen(B);
568 if (l == 0) return 0; /* put nothing on stack */
569 else {
570 lua_pushlstring(B->L, B->buffer, l);
571 B->p = B->buffer;
572 B->lvl++;
573 return 1;
574 }
575}
576
577
578static void adjuststack (luaL_Buffer *B) {
579 if (B->lvl > 1) {
580 lua_State *L = B->L;
581 int toget = 1; /* number of levels to concat */
582 size_t toplen = lua_strlen(L, -1);
583 do {
584 size_t l = lua_strlen(L, -(toget+1));
585 if (B->lvl - toget + 1 >= LIMIT || toplen > l) {
586 toplen += l;
587 toget++;
588 }
589 else break;
590 } while (toget < B->lvl);
591 lua_concat(L, toget);
592 B->lvl = B->lvl - toget + 1;
593 }
594}
595
596
597LUALIB_API char *luaL_prepbuffer (luaL_Buffer *B) {
598 if (emptybuffer(B))
599 adjuststack(B);
600 return B->buffer;
601}
602
603
604LUALIB_API void luaL_addlstring (luaL_Buffer *B, const char *s, size_t l) {
605 while (l--)
606 luaL_addchar(B, *s++);
607}
608
609
610LUALIB_API void luaL_addstring (luaL_Buffer *B, const char *s) {
611 luaL_addlstring(B, s, strlen(s));
612}
613
614
615LUALIB_API void luaL_pushresult (luaL_Buffer *B) {
616 emptybuffer(B);
617 lua_concat(B->L, B->lvl);
618 B->lvl = 1;
619}
620
621
622LUALIB_API void luaL_addvalue (luaL_Buffer *B) {
623 lua_State *L = B->L;
624 size_t vl;
625 const char *s = lua_tolstring(L, -1, &vl);
626 if (vl <= bufffree(B)) { /* fit into buffer? */
627 memcpy(B->p, s, vl); /* put it there */
628 B->p += vl;
629 lua_pop(L, 1); /* remove from stack */
630 }
631 else {
632 if (emptybuffer(B))
633 lua_insert(L, -2); /* put buffer before new value */
634 B->lvl++; /* add new value into B stack */
635 adjuststack(B);
636 }
637}
638
639
640LUALIB_API void luaL_buffinit (lua_State *L, luaL_Buffer *B) {
641 B->L = L;
642 B->p = B->buffer;
643 B->lvl = 0;
644}
645
646/* }====================================================== */
647
648
649LUALIB_API int luaL_ref (lua_State *L, int t) {
650 int ref;
651 t = abs_index(L, t);
652 if (lua_isnil(L, -1)) {
653 lua_pop(L, 1); /* remove from stack */
654 return LUA_REFNIL; /* `nil' has a unique fixed reference */
655 }
656 lua_rawgeti(L, t, FREELIST_REF); /* get first free element */
657 ref = (int)lua_tointeger(L, -1); /* ref = t[FREELIST_REF] */
658 lua_pop(L, 1); /* remove it from stack */
659 if (ref != 0) { /* any free element? */
660 lua_rawgeti(L, t, ref); /* remove it from list */
661 lua_rawseti(L, t, FREELIST_REF); /* (t[FREELIST_REF] = t[ref]) */
662 }
663 else { /* no free elements */
664 ref = (int)lua_objlen(L, t);
665 ref++; /* create new reference */
666 }
667 lua_rawseti(L, t, ref);
668 return ref;
669}
670
671
672LUALIB_API void luaL_unref (lua_State *L, int t, int ref) {
673 if (ref >= 0) {
674 t = abs_index(L, t);
675 lua_rawgeti(L, t, FREELIST_REF);
676 lua_rawseti(L, t, ref); /* t[ref] = t[FREELIST_REF] */
677 lua_pushinteger(L, ref);
678 lua_rawseti(L, t, FREELIST_REF); /* t[FREELIST_REF] = ref */
679 }
680}
681
682
683
684/*
685** {======================================================
686** Load functions
687** =======================================================
688*/
689
690typedef struct LoadF {
691 int extraline;
692 int f;
693 char buff[LUAL_BUFFERSIZE];
694} LoadF;
695
696static const char *getF (lua_State *L, void *ud, size_t *size) {
697 LoadF *lf = (LoadF *)ud;
698 (void)L;
699 if (lf->extraline) {
700 lf->extraline = 0;
701 *size = 1;
702 return "\n";
703 }
704 *size = rb->read(lf->f, lf->buff, LUAL_BUFFERSIZE);
705 return (*size > 0) ? lf->buff : NULL;
706}
707
708
709static int errfile (lua_State *L, const char *what, int fnameindex) {
710 const char *serr = strerror(errno);
711 const char *filename = lua_tostring(L, fnameindex) + 1;
712 lua_pushfstring(L, "cannot %s %s: %s", what, filename, serr);
713 lua_remove(L, fnameindex);
714 return LUA_ERRFILE;
715}
716
717LUALIB_API int luaL_loadfile (lua_State *L, const char *filename) {
718 LoadF lf;
719 int status;
720 int fnameindex = lua_gettop(L) + 1; /* index of filename on the stack */
721 lf.extraline = 0;
722 lf.f = rb->open(filename, O_RDONLY);
723 lua_pushfstring(L, "@%s", filename);
724 if (lf.f < 0) return errfile(L, "open", fnameindex);
725 status = lua_load(L, getF, &lf, lua_tostring(L, -1));
726 rb->close(lf.f);
727 lua_remove(L, fnameindex);
728 return status;
729}
730
731
732typedef struct LoadS {
733 const char *s;
734 size_t size;
735} LoadS;
736
737
738static const char *getS (lua_State *L, void *ud, size_t *size) {
739 LoadS *ls = (LoadS *)ud;
740 (void)L;
741 if (ls->size == 0) return NULL;
742 *size = ls->size;
743 ls->size = 0;
744 return ls->s;
745}
746
747
748LUALIB_API int luaL_loadbuffer (lua_State *L, const char *buff, size_t size,
749 const char *name) {
750 LoadS ls;
751 ls.s = buff;
752 ls.size = size;
753 return lua_load(L, getS, &ls, name);
754}
755
756
757LUALIB_API int (luaL_loadstring) (lua_State *L, const char *s) {
758 return luaL_loadbuffer(L, s, strlen(s), s);
759}
760
761
762
763/* }====================================================== */
764
765
766static void *l_alloc (void *ud, void *ptr, size_t osize, size_t nsize) {
767 (void) osize;
768 lua_State *L = (lua_State *)ud;
769 void *nptr;
770
771 if (nsize == 0) {
772 free(ptr);
773 return NULL;
774 }
775
776 nptr = realloc(ptr, nsize);
777 if (nptr == NULL) {
778 if(L != NULL)
779 {
780 luaC_fullgc(L); /* emergency full collection. */
781 nptr = realloc(ptr, nsize); /* try allocation again */
782 }
783
784 if (nptr == NULL) {
785 LUA_OOM(L); /* if defined.. signal OOM condition */
786 nptr = realloc(ptr, nsize); /* try allocation again */
787 }
788 }
789
790 return nptr;
791}
792
793
794static int panic (lua_State *L) {
795 DEBUGF("PANIC: unprotected error in call to Lua API (%s)\n",
796 lua_tostring(L, -1));
797 rb->splashf(5 * HZ, "PANIC: unprotected error in call to Lua API (%s)",
798 lua_tostring(L, -1));
799
800 return 0;
801}
802
803
804LUALIB_API lua_State *luaL_newstate (void) {
805 lua_State *L = lua_newstate(l_alloc, NULL);
806 if (L){
807 lua_setallocf(L, l_alloc, L); /* allocator needs lua_State. */
808 lua_atpanic(L, &panic);
809 }
810 return L;
811}
812