38 static int findfield (lua_State *L, int objidx, int level) {  in findfield()  argument
39   if (level == 0 || !lua_istable(L, -1))  in findfield()
41   lua_pushnil(L);  /* start 'next' loop */  in findfield()
42   while (lua_next(L, -2)) {  /* for each pair in table */  in findfield()
43     if (lua_type(L, -2) == LUA_TSTRING) {  /* ignore non-string keys */  in findfield()
44       if (lua_rawequal(L, objidx, -1)) {  /* found object? */  in findfield()
45         lua_pop(L, 1);  /* remove value (but keep name) */  in findfield()
48       else if (findfield(L, objidx, level - 1)) {  /* try recursively */  in findfield()
49         lua_remove(L, -2);  /* remove table (but keep name) */  in findfield()
50         lua_pushliteral(L, ".");  in findfield()
51         lua_insert(L, -2);  /* place '.' between the two names */  in findfield()
52         lua_concat(L, 3);  in findfield()
56     lua_pop(L, 1);  /* remove value */  in findfield()
62 static int pushglobalfuncname (lua_State *L, lua_Debug *ar) {  in pushglobalfuncname()  argument
63   int top = lua_gettop(L);  in pushglobalfuncname()
64   lua_getinfo(L, "f", ar);  /* push function */  in pushglobalfuncname()
65   lua_pushglobaltable(L);  in pushglobalfuncname()
66   if (findfield(L, top + 1, 2)) {  in pushglobalfuncname()
67     lua_copy(L, -1, top + 1);  /* move name to proper place */  in pushglobalfuncname()
68     lua_pop(L, 2);  /* remove pushed values */  in pushglobalfuncname()
72     lua_settop(L, top);  /* remove function and global table */  in pushglobalfuncname()
78 static void pushfuncname (lua_State *L, lua_Debug *ar) {  in pushfuncname()  argument
80     lua_pushfstring(L, "function " LUA_QS, ar->name);  in pushfuncname()
82       lua_pushliteral(L, "main chunk");  in pushfuncname()
84     if (pushglobalfuncname(L, ar)) {  in pushfuncname()
85       lua_pushfstring(L, "function " LUA_QS, lua_tostring(L, -1));  in pushfuncname()
86       lua_remove(L, -2);  /* remove name */  in pushfuncname()
89       lua_pushliteral(L, "?");  in pushfuncname()
92     lua_pushfstring(L, "function <%s:%d>", ar->short_src, ar->linedefined);  in pushfuncname()
96 static int countlevels (lua_State *L) {  in countlevels()  argument
100   while (lua_getstack(L, le, &ar)) { li = le; le *= 2; }  in countlevels()
104     if (lua_getstack(L, m, &ar)) li = m + 1;  in countlevels()
111 LUALIB_API void luaL_traceback (lua_State *L, lua_State *L1,  in luaL_traceback()  argument
114   int top = lua_gettop(L);  in luaL_traceback()
117   if (msg) lua_pushfstring(L, "%s\n", msg);  in luaL_traceback()
118   lua_pushliteral(L, "stack traceback:");  in luaL_traceback()
121       lua_pushliteral(L, "\n\t...");  /* add a '...' */  in luaL_traceback()
126       lua_pushfstring(L, "\n\t%s:", ar.short_src);  in luaL_traceback()
128         lua_pushfstring(L, "%d:", ar.currentline);  in luaL_traceback()
129       lua_pushliteral(L, " in ");  in luaL_traceback()
130       pushfuncname(L, &ar);  in luaL_traceback()
132         lua_pushliteral(L, "\n\t(...tail calls...)");  in luaL_traceback()
133       lua_concat(L, lua_gettop(L) - top);  in luaL_traceback()
136   lua_concat(L, lua_gettop(L) - top);  in luaL_traceback()
148 LUALIB_API int luaL_argerror (lua_State *L, int narg, const char *extramsg) {  in luaL_argerror()  argument
150   if (!lua_getstack(L, 0, &ar))  /* no stack frame? */  in luaL_argerror()
151     return luaL_error(L, "bad argument #%d (%s)", narg, extramsg);  in luaL_argerror()
152   lua_getinfo(L, "n", &ar);  in luaL_argerror()
156       return luaL_error(L, "calling " LUA_QS " on bad self (%s)",  in luaL_argerror()
160     ar.name = (pushglobalfuncname(L, &ar)) ? lua_tostring(L, -1) : "?";  in luaL_argerror()
161   return luaL_error(L, "bad argument #%d to " LUA_QS " (%s)",  in luaL_argerror()
166 static int typeerror (lua_State *L, int narg, const char *tname) {  in typeerror()  argument
167   const char *msg = lua_pushfstring(L, "%s expected, got %s",  in typeerror()
168                                     tname, luaL_typename(L, narg));  in typeerror()
169   return luaL_argerror(L, narg, msg);  in typeerror()
173 static void tag_error (lua_State *L, int narg, int tag) {  in tag_error()  argument
174   typeerror(L, narg, lua_typename(L, tag));  in tag_error()
178 LUALIB_API void luaL_where (lua_State *L, int level) {  in luaL_where()  argument
180   if (lua_getstack(L, level, &ar)) {  /* check function at level */  in luaL_where()
181     lua_getinfo(L, "Sl", &ar);  /* get info about it */  in luaL_where()
183       lua_pushfstring(L, "%s:%d: ", ar.short_src, ar.currentline);  in luaL_where()
187   lua_pushliteral(L, "");  /* else, no information available... */  in luaL_where()
191 LUALIB_API int luaL_error (lua_State *L, const char *fmt, ...) {  in luaL_error()  argument
194   luaL_where(L, 1);  in luaL_error()
195   lua_pushvfstring(L, fmt, argp);  in luaL_error()
197   lua_concat(L, 2);  in luaL_error()
198   return lua_error(L);  in luaL_error()
233 LUALIB_API int luaL_newmetatable (lua_State *L, const char *tname) {  in luaL_newmetatable()  argument
234   luaL_getmetatable(L, tname);  /* try to get metatable */  in luaL_newmetatable()
235   if (!lua_isnil(L, -1))  /* name already in use? */  in luaL_newmetatable()
237   lua_pop(L, 1);  in luaL_newmetatable()
238   lua_newtable(L);  /* create metatable */  in luaL_newmetatable()
239   lua_pushvalue(L, -1);  in luaL_newmetatable()
240   lua_setfield(L, LUA_REGISTRYINDEX, tname);  /* registry.name = metatable */  in luaL_newmetatable()
245 LUALIB_API void luaL_setmetatable (lua_State *L, const char *tname) {  in luaL_setmetatable()  argument
246   luaL_getmetatable(L, tname);  in luaL_setmetatable()
247   lua_setmetatable(L, -2);  in luaL_setmetatable()
251 LUALIB_API void *luaL_testudata (lua_State *L, int ud, const char *tname) {  in luaL_testudata()  argument
252   void *p = lua_touserdata(L, ud);  in luaL_testudata()
254     if (lua_getmetatable(L, ud)) {  /* does it have a metatable? */  in luaL_testudata()
255       luaL_getmetatable(L, tname);  /* get correct metatable */  in luaL_testudata()
256       if (!lua_rawequal(L, -1, -2))  /* not the same? */  in luaL_testudata()
258       lua_pop(L, 2);  /* remove both metatables */  in luaL_testudata()
266 LUALIB_API void *luaL_checkudata (lua_State *L, int ud, const char *tname) {  in luaL_checkudata()  argument
267   void *p = luaL_testudata(L, ud, tname);  in luaL_checkudata()
268   if (p == NULL) typeerror(L, ud, tname);  in luaL_checkudata()
281 LUALIB_API int luaL_checkoption (lua_State *L, int narg, const char *def,  in luaL_checkoption()  argument
283   const char *name = (def) ? luaL_optstring(L, narg, def) :  in luaL_checkoption()
284                              luaL_checkstring(L, narg);  in luaL_checkoption()
289   return luaL_argerror(L, narg,  in luaL_checkoption()
290                        lua_pushfstring(L, "invalid option " LUA_QS, name));  in luaL_checkoption()
294 LUALIB_API void luaL_checkstack (lua_State *L, int space, const char *msg) {  in luaL_checkstack()  argument
297   if (!lua_checkstack(L, space + extra)) {  in luaL_checkstack()
299       luaL_error(L, "stack overflow (%s)", msg);  in luaL_checkstack()
301       luaL_error(L, "stack overflow");  in luaL_checkstack()
306 LUALIB_API void luaL_checktype (lua_State *L, int narg, int t) {  in luaL_checktype()  argument
307   if (lua_type(L, narg) != t)  in luaL_checktype()
308     tag_error(L, narg, t);  in luaL_checktype()
312 LUALIB_API void luaL_checkany (lua_State *L, int narg) {  in luaL_checkany()  argument
313   if (lua_type(L, narg) == LUA_TNONE)  in luaL_checkany()
314     luaL_argerror(L, narg, "value expected");  in luaL_checkany()
318 LUALIB_API const char *luaL_checklstring (lua_State *L, int narg, size_t *len) {  in luaL_checklstring()  argument
319   const char *s = lua_tolstring(L, narg, len);  in luaL_checklstring()
320   if (!s) tag_error(L, narg, LUA_TSTRING);  in luaL_checklstring()
325 LUALIB_API const char *luaL_optlstring (lua_State *L, int narg,  in luaL_optlstring()  argument
327   if (lua_isnoneornil(L, narg)) {  in luaL_optlstring()
332   else return luaL_checklstring(L, narg, len);  in luaL_optlstring()
336 LUALIB_API lua_Number luaL_checknumber (lua_State *L, int narg) {  in luaL_checknumber()  argument
338   lua_Number d = lua_tonumberx(L, narg, &isnum);  in luaL_checknumber()
340     tag_error(L, narg, LUA_TNUMBER);  in luaL_checknumber()
345 LUALIB_API lua_Number luaL_optnumber (lua_State *L, int narg, lua_Number def) {  in luaL_optnumber()  argument
346   return luaL_opt(L, luaL_checknumber, narg, def);  in luaL_optnumber()
350 LUALIB_API lua_Integer luaL_checkinteger (lua_State *L, int narg) {  in luaL_checkinteger()  argument
352   lua_Integer d = lua_tointegerx(L, narg, &isnum);  in luaL_checkinteger()
354     tag_error(L, narg, LUA_TNUMBER);  in luaL_checkinteger()
359 LUALIB_API lua_Unsigned luaL_checkunsigned (lua_State *L, int narg) {  in luaL_checkunsigned()  argument
361   lua_Unsigned d = lua_tounsignedx(L, narg, &isnum);  in luaL_checkunsigned()
363     tag_error(L, narg, LUA_TNUMBER);  in luaL_checkunsigned()
368 LUALIB_API lua_Integer luaL_optinteger (lua_State *L, int narg,  in luaL_optinteger()  argument
370   return luaL_opt(L, luaL_checkinteger, narg, def);  in luaL_optinteger()
374 LUALIB_API lua_Unsigned luaL_optunsigned (lua_State *L, int narg,  in luaL_optunsigned()  argument
376   return luaL_opt(L, luaL_checkunsigned, narg, def);  in luaL_optunsigned()
399   lua_State *L = B->L;  in luaL_prepbuffsize()  local
406       luaL_error(L, "buffer too large");  in luaL_prepbuffsize()
408     newbuff = (char *)lua_newuserdata(L, newsize * sizeof(char));  in luaL_prepbuffsize()
412       lua_remove(L, -2);  /* remove old buffer */  in luaL_prepbuffsize()
433   lua_State *L = B->L;  in luaL_pushresult()  local
434   lua_pushlstring(L, B->b, B->n);  in luaL_pushresult()
436     lua_remove(L, -2);  /* remove old buffer */  in luaL_pushresult()
447   lua_State *L = B->L;  in luaL_addvalue()  local
449   const char *s = lua_tolstring(L, -1, &l);  in luaL_addvalue()
451     lua_insert(L, -2);  /* put value below buffer */  in luaL_addvalue()
453   lua_remove(L, (buffonstack(B)) ? -2 : -1);  /* remove value */  in luaL_addvalue()
457 LUALIB_API void luaL_buffinit (lua_State *L, luaL_Buffer *B) {  in luaL_buffinit()  argument
458   B->L = L;  in luaL_buffinit()
465 LUALIB_API char *luaL_buffinitsize (lua_State *L, luaL_Buffer *B, size_t sz) {  in luaL_buffinitsize()  argument
466   luaL_buffinit(L, B);  in luaL_buffinitsize()
483 LUALIB_API int luaL_ref (lua_State *L, int t) {  in luaL_ref()  argument
485   if (lua_isnil(L, -1)) {  in luaL_ref()
486     lua_pop(L, 1);  /* remove from stack */  in luaL_ref()
489   t = lua_absindex(L, t);  in luaL_ref()
490   lua_rawgeti(L, t, freelist);  /* get first free element */  in luaL_ref()
491   ref = (int)lua_tointeger(L, -1);  /* ref = t[freelist] */  in luaL_ref()
492   lua_pop(L, 1);  /* remove it from stack */  in luaL_ref()
494     lua_rawgeti(L, t, ref);  /* remove it from list */  in luaL_ref()
495     lua_rawseti(L, t, freelist);  /* (t[freelist] = t[ref]) */  in luaL_ref()
498     ref = (int)lua_rawlen(L, t) + 1;  /* get a new reference */  in luaL_ref()
499   lua_rawseti(L, t, ref);  in luaL_ref()
504 LUALIB_API void luaL_unref (lua_State *L, int t, int ref) {  in luaL_unref()  argument
506     t = lua_absindex(L, t);  in luaL_unref()
507     lua_rawgeti(L, t, freelist);  in luaL_unref()
508     lua_rawseti(L, t, ref);  /* t[ref] = t[freelist] */  in luaL_unref()
509     lua_pushinteger(L, ref);  in luaL_unref()
510     lua_rawseti(L, t, freelist);  /* t[freelist] = ref */  in luaL_unref()
529 static const char *getS (lua_State *L, void *ud, size_t *size) {  in getS()  argument
531   (void)L;  /* not used */  in getS()
539 LUALIB_API int luaL_loadbufferx (lua_State *L, const char *buff, size_t size,  in luaL_loadbufferx()  argument
544   return lua_load(L, getS, &ls, name, mode);  in luaL_loadbufferx()
548 LUALIB_API int luaL_loadstring (lua_State *L, const char *s) {  in luaL_loadstring()  argument
549   return luaL_loadbuffer(L, s, strlen(s), s);  in luaL_loadstring()
556 LUALIB_API int luaL_getmetafield (lua_State *L, int obj, const char *event) {  in luaL_getmetafield()  argument
557   if (!lua_getmetatable(L, obj))  /* no metatable? */  in luaL_getmetafield()
559   lua_pushstring(L, event);  in luaL_getmetafield()
560   lua_rawget(L, -2);  in luaL_getmetafield()
561   if (lua_isnil(L, -1)) {  in luaL_getmetafield()
562     lua_pop(L, 2);  /* remove metatable and metafield */  in luaL_getmetafield()
566     lua_remove(L, -2);  /* remove only metatable */  in luaL_getmetafield()
572 LUALIB_API int luaL_callmeta (lua_State *L, int obj, const char *event) {  in luaL_callmeta()  argument
573   obj = lua_absindex(L, obj);  in luaL_callmeta()
574   if (!luaL_getmetafield(L, obj, event))  /* no metafield? */  in luaL_callmeta()
576   lua_pushvalue(L, obj);  in luaL_callmeta()
577   lua_call(L, 1, 1);  in luaL_callmeta()
582 LUALIB_API int luaL_len (lua_State *L, int idx) {  in luaL_len()  argument
585   lua_len(L, idx);  in luaL_len()
586   l = (int)lua_tointegerx(L, -1, &isnum);  in luaL_len()
588     luaL_error(L, "object length is not a number");  in luaL_len()
589   lua_pop(L, 1);  /* remove object */  in luaL_len()
594 LUALIB_API const char *luaL_tolstring (lua_State *L, int idx, size_t *len) {  in luaL_tolstring()  argument
595   if (!luaL_callmeta(L, idx, "__tostring")) {  /* no metafield? */  in luaL_tolstring()
596     switch (lua_type(L, idx)) {  in luaL_tolstring()
599         lua_pushvalue(L, idx);  in luaL_tolstring()
602         lua_pushstring(L, (lua_toboolean(L, idx) ? "true" : "false"));  in luaL_tolstring()
605         lua_pushliteral(L, "nil");  in luaL_tolstring()
608         lua_pushfstring(L, "%s: %p", luaL_typename(L, idx),  in luaL_tolstring()
609                                             lua_topointer(L, idx));  in luaL_tolstring()
613   return lua_tolstring(L, -1, len);  in luaL_tolstring()
624 static const char *luaL_findtable (lua_State *L, int idx,  in luaL_findtable()  argument
627   if (idx) lua_pushvalue(L, idx);  in luaL_findtable()
631     lua_pushlstring(L, fname, e - fname);  in luaL_findtable()
632     lua_rawget(L, -2);  in luaL_findtable()
633     if (lua_isnil(L, -1)) {  /* no such field? */  in luaL_findtable()
634       lua_pop(L, 1);  /* remove this nil */  in luaL_findtable()
635       lua_createtable(L, 0, (*e == '.' ? 1 : szhint)); /* new table for field */  in luaL_findtable()
636       lua_pushlstring(L, fname, e - fname);  in luaL_findtable()
637       lua_pushvalue(L, -2);  in luaL_findtable()
638       lua_settable(L, -4);  /* set new table into field */  in luaL_findtable()
640     else if (!lua_istable(L, -1)) {  /* field has a non-table value? */  in luaL_findtable()
641       lua_pop(L, 2);  /* remove table and value */  in luaL_findtable()
644     lua_remove(L, -2);  /* remove previous table */  in luaL_findtable()
667 LUALIB_API void luaL_pushmodule (lua_State *L, const char *modname,  in luaL_pushmodule()  argument
669   luaL_findtable(L, LUA_REGISTRYINDEX, "_LOADED", 1);  /* get _LOADED table */  in luaL_pushmodule()
670   lua_getfield(L, -1, modname);  /* get _LOADED[modname] */  in luaL_pushmodule()
671   if (!lua_istable(L, -1)) {  /* not found? */  in luaL_pushmodule()
672     lua_pop(L, 1);  /* remove previous result */  in luaL_pushmodule()
674     lua_pushglobaltable(L);  in luaL_pushmodule()
675     if (luaL_findtable(L, 0, modname, sizehint) != NULL)  in luaL_pushmodule()
676       luaL_error(L, "name conflict for module " LUA_QS, modname);  in luaL_pushmodule()
677     lua_pushvalue(L, -1);  in luaL_pushmodule()
678     lua_setfield(L, -3, modname);  /* _LOADED[modname] = new table */  in luaL_pushmodule()
680   lua_remove(L, -2);  /* remove _LOADED table */  in luaL_pushmodule()
684 LUALIB_API void luaL_openlib (lua_State *L, const char *libname,  in luaL_openlib()  argument
686   luaL_checkversion(L);  in luaL_openlib()
688     luaL_pushmodule(L, libname, libsize(l));  /* get/create library table */  in luaL_openlib()
689     lua_insert(L, -(nup + 1));  /* move library table to below upvalues */  in luaL_openlib()
692     luaL_setfuncs(L, l, nup);  in luaL_openlib()
694     lua_pop(L, nup);  /* remove upvalues */  in luaL_openlib()
705 LUALIB_API void luaL_setfuncs (lua_State *L, const luaL_Reg *l, int nup) {  in luaL_setfuncs()  argument
706   luaL_checkversion(L);  in luaL_setfuncs()
707   luaL_checkstack(L, nup, "too many upvalues");  in luaL_setfuncs()
711       lua_pushvalue(L, -nup);  in luaL_setfuncs()
712     lua_pushcclosure(L, l->func, nup);  /* closure with those upvalues */  in luaL_setfuncs()
713     lua_setfield(L, -(nup + 2), l->name);  in luaL_setfuncs()
715   lua_pop(L, nup);  /* remove upvalues */  in luaL_setfuncs()
723 LUALIB_API int luaL_getsubtable (lua_State *L, int idx, const char *fname) {  in luaL_getsubtable()  argument
724   lua_getfield(L, idx, fname);  in luaL_getsubtable()
725   if (lua_istable(L, -1)) return 1;  /* table already there */  in luaL_getsubtable()
727     lua_pop(L, 1);  /* remove previous result */  in luaL_getsubtable()
728     idx = lua_absindex(L, idx);  in luaL_getsubtable()
729     lua_newtable(L);  in luaL_getsubtable()
730     lua_pushvalue(L, -1);  /* copy to be left at top */  in luaL_getsubtable()
731     lua_setfield(L, idx, fname);  /* assign new table to field */  in luaL_getsubtable()
743 LUALIB_API void luaL_requiref (lua_State *L, const char *modname,  in luaL_requiref()  argument
745   lua_pushcfunction(L, openf);  in luaL_requiref()
746   lua_pushstring(L, modname);  /* argument to open function */  in luaL_requiref()
747   lua_call(L, 1, 1);  /* open module */  in luaL_requiref()
748   luaL_getsubtable(L, LUA_REGISTRYINDEX, "_LOADED");  in luaL_requiref()
749   lua_pushvalue(L, -2);  /* make copy of module (call result) */  in luaL_requiref()
750   lua_setfield(L, -2, modname);  /* _LOADED[modname] = module */  in luaL_requiref()
751   lua_pop(L, 1);  /* remove _LOADED table */  in luaL_requiref()
753     lua_pushvalue(L, -1);  /* copy of 'mod' */  in luaL_requiref()
754     lua_setglobal(L, modname);  /* _G[modname] = module */  in luaL_requiref()
759 LUALIB_API const char *luaL_gsub (lua_State *L, const char *s, const char *p,  in luaL_gsub()  argument
764   luaL_buffinit(L, &b);  in luaL_gsub()
772   return lua_tostring(L, -1);  in luaL_gsub()
776 LUALIB_API void luaL_checkversion_ (lua_State *L, lua_Number ver) {  in luaL_checkversion_()  argument
777   const lua_Number *v = lua_version(L);  in luaL_checkversion_()
779     luaL_error(L, "multiple Lua VMs detected");  in luaL_checkversion_()
781     luaL_error(L, "version mismatch: app. needs %f, Lua core provides %f",  in luaL_checkversion_()
784   lua_pushnumber(L, -(lua_Number)0x1234);  in luaL_checkversion_()
785   if (lua_tointeger(L, -1) != -0x1234 ||  in luaL_checkversion_()
786       lua_tounsigned(L, -1) != (lua_Unsigned)-0x1234)  in luaL_checkversion_()
787     luaL_error(L, "bad conversion number->int;"  in luaL_checkversion_()
789   lua_pop(L, 1);  in luaL_checkversion_()