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  1. /*
  2. ** $Id: lbaselib.c,v 1.191.1.6 2008/02/14 16:46:22 roberto Exp $
  3. ** Basic library
  4. ** See Copyright Notice in lua.h
  5. */
  6.  
  7.  
  8.  
  9. #include <ctype.h>
  10. #include <stdio.h>
  11. #include <stdlib.h>
  12. #include <string.h>
  13.  
  14. #define lbaselib_c
  15. #define LUA_LIB
  16.  
  17. #include "lua.h"
  18.  
  19. #include "lauxlib.h"
  20. #include "lualib.h"
  21.  
  22.  
  23.  
  24.  
  25. /*
  26. ** If your system does not support `stdout', you can just remove this function.
  27. ** If you need, you can define your own `print' function, following this
  28. ** model but changing `fputs' to put the strings at a proper place
  29. ** (a console window or a log file, for instance).
  30. */
  31. static int luaB_print (lua_State *L) {
  32.   int n = lua_gettop(L);  /* number of arguments */
  33.   int i;
  34.   lua_getglobal(L, "tostring");
  35.   for (i=1; i<=n; i++) {
  36.     const char *s;
  37.     lua_pushvalue(L, -1);  /* function to be called */
  38.     lua_pushvalue(L, i);   /* value to print */
  39.     lua_call(L, 1, 1);
  40.     s = lua_tostring(L, -1);  /* get result */
  41.     if (s == NULL)
  42.       return luaL_error(L, LUA_QL("tostring") " must return a string to "
  43.                            LUA_QL("print"));
  44.     if (i>1) fputs("\t", stdout);
  45.     fputs(s, stdout);
  46.     lua_pop(L, 1);  /* pop result */
  47.   }
  48.   fputs("\n", stdout);
  49.   return 0;
  50. }
  51.  
  52.  
  53. static int luaB_tonumber (lua_State *L) {
  54.   int base = luaL_optint(L, 2, 10);
  55.   if (base == 10) {  /* standard conversion */
  56.     luaL_checkany(L, 1);
  57.     if (lua_isnumber(L, 1)) {
  58.       lua_pushnumber(L, lua_tonumber(L, 1));
  59.       return 1;
  60.     }
  61.   }
  62.   else {
  63.     const char *s1 = luaL_checkstring(L, 1);
  64.     char *s2;
  65.     unsigned long n;
  66.     luaL_argcheck(L, 2 <= base && base <= 36, 2, "base out of range");
  67.     n = strtoul(s1, &s2, base);
  68.     if (s1 != s2) {  /* at least one valid digit? */
  69.       while (isspace((unsigned char)(*s2))) s2++;  /* skip trailing spaces */
  70.       if (*s2 == '\0') {  /* no invalid trailing characters? */
  71.         lua_pushnumber(L, (lua_Number)n);
  72.         return 1;
  73.       }
  74.     }
  75.   }
  76.   lua_pushnil(L);  /* else not a number */
  77.   return 1;
  78. }
  79.  
  80.  
  81. static int luaB_error (lua_State *L) {
  82.   int level = luaL_optint(L, 2, 1);
  83.   lua_settop(L, 1);
  84.   if (lua_isstring(L, 1) && level > 0) {  /* add extra information? */
  85.     luaL_where(L, level);
  86.     lua_pushvalue(L, 1);
  87.     lua_concat(L, 2);
  88.   }
  89.   return lua_error(L);
  90. }
  91.  
  92.  
  93. static int luaB_getmetatable (lua_State *L) {
  94.   luaL_checkany(L, 1);
  95.   if (!lua_getmetatable(L, 1)) {
  96.     lua_pushnil(L);
  97.     return 1;  /* no metatable */
  98.   }
  99.   luaL_getmetafield(L, 1, "__metatable");
  100.   return 1;  /* returns either __metatable field (if present) or metatable */
  101. }
  102.  
  103.  
  104. static int luaB_setmetatable (lua_State *L) {
  105.   int t = lua_type(L, 2);
  106.   luaL_checktype(L, 1, LUA_TTABLE);
  107.   luaL_argcheck(L, t == LUA_TNIL || t == LUA_TTABLE, 2,
  108.                     "nil or table expected");
  109.   if (luaL_getmetafield(L, 1, "__metatable"))
  110.     luaL_error(L, "cannot change a protected metatable");
  111.   lua_settop(L, 2);
  112.   lua_setmetatable(L, 1);
  113.   return 1;
  114. }
  115.  
  116.  
  117. static void getfunc (lua_State *L, int opt) {
  118.   if (lua_isfunction(L, 1)) lua_pushvalue(L, 1);
  119.   else {
  120.     lua_Debug ar;
  121.     int level = opt ? luaL_optint(L, 1, 1) : luaL_checkint(L, 1);
  122.     luaL_argcheck(L, level >= 0, 1, "level must be non-negative");
  123.     if (lua_getstack(L, level, &ar) == 0)
  124.       luaL_argerror(L, 1, "invalid level");
  125.     lua_getinfo(L, "f", &ar);
  126.     if (lua_isnil(L, -1))
  127.       luaL_error(L, "no function environment for tail call at level %d",
  128.                     level);
  129.   }
  130. }
  131.  
  132.  
  133. static int luaB_getfenv (lua_State *L) {
  134.   getfunc(L, 1);
  135.   if (lua_iscfunction(L, -1))  /* is a C function? */
  136.     lua_pushvalue(L, LUA_GLOBALSINDEX);  /* return the thread's global env. */
  137.   else
  138.     lua_getfenv(L, -1);
  139.   return 1;
  140. }
  141.  
  142.  
  143. static int luaB_setfenv (lua_State *L) {
  144.   luaL_checktype(L, 2, LUA_TTABLE);
  145.   getfunc(L, 0);
  146.   lua_pushvalue(L, 2);
  147.   if (lua_isnumber(L, 1) && lua_tonumber(L, 1) == 0) {
  148.     /* change environment of current thread */
  149.     lua_pushthread(L);
  150.     lua_insert(L, -2);
  151.     lua_setfenv(L, -2);
  152.     return 0;
  153.   }
  154.   else if (lua_iscfunction(L, -2) || lua_setfenv(L, -2) == 0)
  155.     luaL_error(L,
  156.           LUA_QL("setfenv") " cannot change environment of given object");
  157.   return 1;
  158. }
  159.  
  160.  
  161. static int luaB_rawequal (lua_State *L) {
  162.   luaL_checkany(L, 1);
  163.   luaL_checkany(L, 2);
  164.   lua_pushboolean(L, lua_rawequal(L, 1, 2));
  165.   return 1;
  166. }
  167.  
  168.  
  169. static int luaB_rawget (lua_State *L) {
  170.   luaL_checktype(L, 1, LUA_TTABLE);
  171.   luaL_checkany(L, 2);
  172.   lua_settop(L, 2);
  173.   lua_rawget(L, 1);
  174.   return 1;
  175. }
  176.  
  177. static int luaB_rawset (lua_State *L) {
  178.   luaL_checktype(L, 1, LUA_TTABLE);
  179.   luaL_checkany(L, 2);
  180.   luaL_checkany(L, 3);
  181.   lua_settop(L, 3);
  182.   lua_rawset(L, 1);
  183.   return 1;
  184. }
  185.  
  186.  
  187. static int luaB_gcinfo (lua_State *L) {
  188.   lua_pushinteger(L, lua_getgccount(L));
  189.   return 1;
  190. }
  191.  
  192.  
  193. static int luaB_collectgarbage (lua_State *L) {
  194.   static const char *const opts[] = {"stop", "restart", "collect",
  195.     "count", "step", "setpause", "setstepmul", NULL};
  196.   static const int optsnum[] = {LUA_GCSTOP, LUA_GCRESTART, LUA_GCCOLLECT,
  197.     LUA_GCCOUNT, LUA_GCSTEP, LUA_GCSETPAUSE, LUA_GCSETSTEPMUL};
  198.   int o = luaL_checkoption(L, 1, "collect", opts);
  199.   int ex = luaL_optint(L, 2, 0);
  200.   int res = lua_gc(L, optsnum[o], ex);
  201.   switch (optsnum[o]) {
  202.     case LUA_GCCOUNT: {
  203.       int b = lua_gc(L, LUA_GCCOUNTB, 0);
  204.       lua_pushnumber(L, res + ((lua_Number)b/1024));
  205.       return 1;
  206.     }
  207.     case LUA_GCSTEP: {
  208.       lua_pushboolean(L, res);
  209.       return 1;
  210.     }
  211.     default: {
  212.       lua_pushnumber(L, res);
  213.       return 1;
  214.     }
  215.   }
  216. }
  217.  
  218.  
  219. static int luaB_type (lua_State *L) {
  220.   luaL_checkany(L, 1);
  221.   lua_pushstring(L, luaL_typename(L, 1));
  222.   return 1;
  223. }
  224.  
  225.  
  226. static int luaB_next (lua_State *L) {
  227.   luaL_checktype(L, 1, LUA_TTABLE);
  228.   lua_settop(L, 2);  /* create a 2nd argument if there isn't one */
  229.   if (lua_next(L, 1))
  230.     return 2;
  231.   else {
  232.     lua_pushnil(L);
  233.     return 1;
  234.   }
  235. }
  236.  
  237.  
  238. static int luaB_pairs (lua_State *L) {
  239.   luaL_checktype(L, 1, LUA_TTABLE);
  240.   lua_pushvalue(L, lua_upvalueindex(1));  /* return generator, */
  241.   lua_pushvalue(L, 1);  /* state, */
  242.   lua_pushnil(L);  /* and initial value */
  243.   return 3;
  244. }
  245.  
  246.  
  247. static int ipairsaux (lua_State *L) {
  248.   int i = luaL_checkint(L, 2);
  249.   luaL_checktype(L, 1, LUA_TTABLE);
  250.   i++;  /* next value */
  251.   lua_pushinteger(L, i);
  252.   lua_rawgeti(L, 1, i);
  253.   return (lua_isnil(L, -1)) ? 0 : 2;
  254. }
  255.  
  256.  
  257. static int luaB_ipairs (lua_State *L) {
  258.   luaL_checktype(L, 1, LUA_TTABLE);
  259.   lua_pushvalue(L, lua_upvalueindex(1));  /* return generator, */
  260.   lua_pushvalue(L, 1);  /* state, */
  261.   lua_pushinteger(L, 0);  /* and initial value */
  262.   return 3;
  263. }
  264.  
  265.  
  266. static int load_aux (lua_State *L, int status) {
  267.   if (status == 0)  /* OK? */
  268.     return 1;
  269.   else {
  270.     lua_pushnil(L);
  271.     lua_insert(L, -2);  /* put before error message */
  272.     return 2;  /* return nil plus error message */
  273.   }
  274. }
  275.  
  276.  
  277. static int luaB_loadstring (lua_State *L) {
  278.   size_t l;
  279.   const char *s = luaL_checklstring(L, 1, &l);
  280.   const char *chunkname = luaL_optstring(L, 2, s);
  281.   return load_aux(L, luaL_loadbuffer(L, s, l, chunkname));
  282. }
  283.  
  284.  
  285. static int luaB_loadfile (lua_State *L) {
  286.   const char *fname = luaL_optstring(L, 1, NULL);
  287.   return load_aux(L, luaL_loadfile(L, fname));
  288. }
  289.  
  290.  
  291. /*
  292. ** Reader for generic `load' function: `lua_load' uses the
  293. ** stack for internal stuff, so the reader cannot change the
  294. ** stack top. Instead, it keeps its resulting string in a
  295. ** reserved slot inside the stack.
  296. */
  297. static const char *generic_reader (lua_State *L, void *ud, size_t *size) {
  298.   (void)ud;  /* to avoid warnings */
  299.   luaL_checkstack(L, 2, "too many nested functions");
  300.   lua_pushvalue(L, 1);  /* get function */
  301.   lua_call(L, 0, 1);  /* call it */
  302.   if (lua_isnil(L, -1)) {
  303.     *size = 0;
  304.     return NULL;
  305.   }
  306.   else if (lua_isstring(L, -1)) {
  307.     lua_replace(L, 3);  /* save string in a reserved stack slot */
  308.     return lua_tolstring(L, 3, size);
  309.   }
  310.   else luaL_error(L, "reader function must return a string");
  311.   return NULL;  /* to avoid warnings */
  312. }
  313.  
  314.  
  315. static int luaB_load (lua_State *L) {
  316.   int status;
  317.   const char *cname = luaL_optstring(L, 2, "=(load)");
  318.   luaL_checktype(L, 1, LUA_TFUNCTION);
  319.   lua_settop(L, 3);  /* function, eventual name, plus one reserved slot */
  320.   status = lua_load(L, generic_reader, NULL, cname);
  321.   return load_aux(L, status);
  322. }
  323.  
  324.  
  325. static int luaB_dofile (lua_State *L) {
  326.   const char *fname = luaL_optstring(L, 1, NULL);
  327.   int n = lua_gettop(L);
  328.   if (luaL_loadfile(L, fname) != 0) lua_error(L);
  329.   lua_call(L, 0, LUA_MULTRET);
  330.   return lua_gettop(L) - n;
  331. }
  332.  
  333.  
  334. static int luaB_assert (lua_State *L) {
  335.   luaL_checkany(L, 1);
  336.   if (!lua_toboolean(L, 1))
  337.     return luaL_error(L, "%s", luaL_optstring(L, 2, "assertion failed!"));
  338.   return lua_gettop(L);
  339. }
  340.  
  341.  
  342. static int luaB_unpack (lua_State *L) {
  343.   int i, e, n;
  344.   luaL_checktype(L, 1, LUA_TTABLE);
  345.   i = luaL_optint(L, 2, 1);
  346.   e = luaL_opt(L, luaL_checkint, 3, luaL_getn(L, 1));
  347.   if (i > e) return 0;  /* empty range */
  348.   n = e - i + 1;  /* number of elements */
  349.   if (n <= 0 || !lua_checkstack(L, n))  /* n <= 0 means arith. overflow */
  350.     return luaL_error(L, "too many results to unpack");
  351.   lua_rawgeti(L, 1, i);  /* push arg[i] (avoiding overflow problems) */
  352.   while (i++ < e)  /* push arg[i + 1...e] */
  353.     lua_rawgeti(L, 1, i);
  354.   return n;
  355. }
  356.  
  357.  
  358. static int luaB_select (lua_State *L) {
  359.   int n = lua_gettop(L);
  360.   if (lua_type(L, 1) == LUA_TSTRING && *lua_tostring(L, 1) == '#') {
  361.     lua_pushinteger(L, n-1);
  362.     return 1;
  363.   }
  364.   else {
  365.     int i = luaL_checkint(L, 1);
  366.     if (i < 0) i = n + i;
  367.     else if (i > n) i = n;
  368.     luaL_argcheck(L, 1 <= i, 1, "index out of range");
  369.     return n - i;
  370.   }
  371. }
  372.  
  373.  
  374. static int luaB_pcall (lua_State *L) {
  375.   int status;
  376.   luaL_checkany(L, 1);
  377.   status = lua_pcall(L, lua_gettop(L) - 1, LUA_MULTRET, 0);
  378.   lua_pushboolean(L, (status == 0));
  379.   lua_insert(L, 1);
  380.   return lua_gettop(L);  /* return status + all results */
  381. }
  382.  
  383.  
  384. static int luaB_xpcall (lua_State *L) {
  385.   int status;
  386.   luaL_checkany(L, 2);
  387.   lua_settop(L, 2);
  388.   lua_insert(L, 1);  /* put error function under function to be called */
  389.   status = lua_pcall(L, 0, LUA_MULTRET, 1);
  390.   lua_pushboolean(L, (status == 0));
  391.   lua_replace(L, 1);
  392.   return lua_gettop(L);  /* return status + all results */
  393. }
  394.  
  395.  
  396. static int luaB_tostring (lua_State *L) {
  397.   luaL_checkany(L, 1);
  398.   if (luaL_callmeta(L, 1, "__tostring"))  /* is there a metafield? */
  399.     return 1;  /* use its value */
  400.   switch (lua_type(L, 1)) {
  401.     case LUA_TNUMBER:
  402.       lua_pushstring(L, lua_tostring(L, 1));
  403.       break;
  404.     case LUA_TSTRING:
  405.       lua_pushvalue(L, 1);
  406.       break;
  407.     case LUA_TBOOLEAN:
  408.       lua_pushstring(L, (lua_toboolean(L, 1) ? "true" : "false"));
  409.       break;
  410.     case LUA_TNIL:
  411.       lua_pushliteral(L, "nil");
  412.       break;
  413.     default:
  414.       lua_pushfstring(L, "%s: %p", luaL_typename(L, 1), lua_topointer(L, 1));
  415.       break;
  416.   }
  417.   return 1;
  418. }
  419.  
  420.  
  421. static int luaB_newproxy (lua_State *L) {
  422.   lua_settop(L, 1);
  423.   lua_newuserdata(L, 0);  /* create proxy */
  424.   if (lua_toboolean(L, 1) == 0)
  425.     return 1;  /* no metatable */
  426.   else if (lua_isboolean(L, 1)) {
  427.     lua_newtable(L);  /* create a new metatable `m' ... */
  428.     lua_pushvalue(L, -1);  /* ... and mark `m' as a valid metatable */
  429.     lua_pushboolean(L, 1);
  430.     lua_rawset(L, lua_upvalueindex(1));  /* weaktable[m] = true */
  431.   }
  432.   else {
  433.     int validproxy = 0;  /* to check if weaktable[metatable(u)] == true */
  434.     if (lua_getmetatable(L, 1)) {
  435.       lua_rawget(L, lua_upvalueindex(1));
  436.       validproxy = lua_toboolean(L, -1);
  437.       lua_pop(L, 1);  /* remove value */
  438.     }
  439.     luaL_argcheck(L, validproxy, 1, "boolean or proxy expected");
  440.     lua_getmetatable(L, 1);  /* metatable is valid; get it */
  441.   }
  442.   lua_setmetatable(L, 2);
  443.   return 1;
  444. }
  445.  
  446.  
  447. static const luaL_Reg base_funcs[] = {
  448.   {"assert", luaB_assert},
  449.   {"collectgarbage", luaB_collectgarbage},
  450.   {"dofile", luaB_dofile},
  451.   {"error", luaB_error},
  452.   {"gcinfo", luaB_gcinfo},
  453.   {"getfenv", luaB_getfenv},
  454.   {"getmetatable", luaB_getmetatable},
  455.   {"loadfile", luaB_loadfile},
  456.   {"load", luaB_load},
  457.   {"loadstring", luaB_loadstring},
  458.   {"next", luaB_next},
  459.   {"pcall", luaB_pcall},
  460.   {"print", luaB_print},
  461.   {"rawequal", luaB_rawequal},
  462.   {"rawget", luaB_rawget},
  463.   {"rawset", luaB_rawset},
  464.   {"select", luaB_select},
  465.   {"setfenv", luaB_setfenv},
  466.   {"setmetatable", luaB_setmetatable},
  467.   {"tonumber", luaB_tonumber},
  468.   {"tostring", luaB_tostring},
  469.   {"type", luaB_type},
  470.   {"unpack", luaB_unpack},
  471.   {"xpcall", luaB_xpcall},
  472.   {NULL, NULL}
  473. };
  474.  
  475.  
  476. /*
  477. ** {======================================================
  478. ** Coroutine library
  479. ** =======================================================
  480. */
  481.  
  482. #define CO_RUN  0       /* running */
  483. #define CO_SUS  1       /* suspended */
  484. #define CO_NOR  2       /* 'normal' (it resumed another coroutine) */
  485. #define CO_DEAD 3
  486.  
  487. static const char *const statnames[] =
  488.     {"running", "suspended", "normal", "dead"};
  489.  
  490. static int costatus (lua_State *L, lua_State *co) {
  491.   if (L == co) return CO_RUN;
  492.   switch (lua_status(co)) {
  493.     case LUA_YIELD:
  494.       return CO_SUS;
  495.     case 0: {
  496.       lua_Debug ar;
  497.       if (lua_getstack(co, 0, &ar) > 0)  /* does it have frames? */
  498.         return CO_NOR;  /* it is running */
  499.       else if (lua_gettop(co) == 0)
  500.           return CO_DEAD;
  501.       else
  502.         return CO_SUS;  /* initial state */
  503.     }
  504.     default:  /* some error occured */
  505.       return CO_DEAD;
  506.   }
  507. }
  508.  
  509.  
  510. static int luaB_costatus (lua_State *L) {
  511.   lua_State *co = lua_tothread(L, 1);
  512.   luaL_argcheck(L, co, 1, "coroutine expected");
  513.   lua_pushstring(L, statnames[costatus(L, co)]);
  514.   return 1;
  515. }
  516.  
  517.  
  518. static int auxresume (lua_State *L, lua_State *co, int narg) {
  519.   int status = costatus(L, co);
  520.   if (!lua_checkstack(co, narg))
  521.     luaL_error(L, "too many arguments to resume");
  522.   if (status != CO_SUS) {
  523.     lua_pushfstring(L, "cannot resume %s coroutine", statnames[status]);
  524.     return -1;  /* error flag */
  525.   }
  526.   lua_xmove(L, co, narg);
  527.   lua_setlevel(L, co);
  528.   status = lua_resume(co, narg);
  529.   if (status == 0 || status == LUA_YIELD) {
  530.     int nres = lua_gettop(co);
  531.     if (!lua_checkstack(L, nres + 1))
  532.       luaL_error(L, "too many results to resume");
  533.     lua_xmove(co, L, nres);  /* move yielded values */
  534.     return nres;
  535.   }
  536.   else {
  537.     lua_xmove(co, L, 1);  /* move error message */
  538.     return -1;  /* error flag */
  539.   }
  540. }
  541.  
  542.  
  543. static int luaB_coresume (lua_State *L) {
  544.   lua_State *co = lua_tothread(L, 1);
  545.   int r;
  546.   luaL_argcheck(L, co, 1, "coroutine expected");
  547.   r = auxresume(L, co, lua_gettop(L) - 1);
  548.   if (r < 0) {
  549.     lua_pushboolean(L, 0);
  550.     lua_insert(L, -2);
  551.     return 2;  /* return false + error message */
  552.   }
  553.   else {
  554.     lua_pushboolean(L, 1);
  555.     lua_insert(L, -(r + 1));
  556.     return r + 1;  /* return true + `resume' returns */
  557.   }
  558. }
  559.  
  560.  
  561. static int luaB_auxwrap (lua_State *L) {
  562.   lua_State *co = lua_tothread(L, lua_upvalueindex(1));
  563.   int r = auxresume(L, co, lua_gettop(L));
  564.   if (r < 0) {
  565.     if (lua_isstring(L, -1)) {  /* error object is a string? */
  566.       luaL_where(L, 1);  /* add extra info */
  567.       lua_insert(L, -2);
  568.       lua_concat(L, 2);
  569.     }
  570.     lua_error(L);  /* propagate error */
  571.   }
  572.   return r;
  573. }
  574.  
  575.  
  576. static int luaB_cocreate (lua_State *L) {
  577.   lua_State *NL = lua_newthread(L);
  578.   luaL_argcheck(L, lua_isfunction(L, 1) && !lua_iscfunction(L, 1), 1,
  579.     "Lua function expected");
  580.   lua_pushvalue(L, 1);  /* move function to top */
  581.   lua_xmove(L, NL, 1);  /* move function from L to NL */
  582.   return 1;
  583. }
  584.  
  585.  
  586. static int luaB_cowrap (lua_State *L) {
  587.   luaB_cocreate(L);
  588.   lua_pushcclosure(L, luaB_auxwrap, 1);
  589.   return 1;
  590. }
  591.  
  592.  
  593. static int luaB_yield (lua_State *L) {
  594.   return lua_yield(L, lua_gettop(L));
  595. }
  596.  
  597.  
  598. static int luaB_corunning (lua_State *L) {
  599.   if (lua_pushthread(L))
  600.     lua_pushnil(L);  /* main thread is not a coroutine */
  601.   return 1;
  602. }
  603.  
  604.  
  605. static const luaL_Reg co_funcs[] = {
  606.   {"create", luaB_cocreate},
  607.   {"resume", luaB_coresume},
  608.   {"running", luaB_corunning},
  609.   {"status", luaB_costatus},
  610.   {"wrap", luaB_cowrap},
  611.   {"yield", luaB_yield},
  612.   {NULL, NULL}
  613. };
  614.  
  615. /* }====================================================== */
  616.  
  617.  
  618. static void auxopen (lua_State *L, const char *name,
  619.                      lua_CFunction f, lua_CFunction u) {
  620.   lua_pushcfunction(L, u);
  621.   lua_pushcclosure(L, f, 1);
  622.   lua_setfield(L, -2, name);
  623. }
  624.  
  625.  
  626. static void base_open (lua_State *L) {
  627.   /* set global _G */
  628.   lua_pushvalue(L, LUA_GLOBALSINDEX);
  629.   lua_setglobal(L, "_G");
  630.   /* open lib into global table */
  631.   luaL_register(L, "_G", base_funcs);
  632.   lua_pushliteral(L, LUA_VERSION);
  633.   lua_setglobal(L, "_VERSION");  /* set global _VERSION */
  634.   /* `ipairs' and `pairs' need auxiliary functions as upvalues */
  635.   auxopen(L, "ipairs", luaB_ipairs, ipairsaux);
  636.   auxopen(L, "pairs", luaB_pairs, luaB_next);
  637.   /* `newproxy' needs a weaktable as upvalue */
  638.   lua_createtable(L, 0, 1);  /* new table `w' */
  639.   lua_pushvalue(L, -1);  /* `w' will be its own metatable */
  640.   lua_setmetatable(L, -2);
  641.   lua_pushliteral(L, "kv");
  642.   lua_setfield(L, -2, "__mode");  /* metatable(w).__mode = "kv" */
  643.   lua_pushcclosure(L, luaB_newproxy, 1);
  644.   lua_setglobal(L, "newproxy");  /* set global `newproxy' */
  645. }
  646.  
  647.  
  648. LUALIB_API int luaopen_base (lua_State *L) {
  649.   base_open(L);
  650.   luaL_register(L, LUA_COLIBNAME, co_funcs);
  651.   return 2;
  652. }
  653.  
  654.