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  1. /*
  2. ** $Id: lbaselib.c $
  3. ** Basic library
  4. ** See Copyright Notice in lua.h
  5. */
  6.  
  7. #define lbaselib_c
  8. #define LUA_LIB
  9.  
  10. #include "lprefix.h"
  11.  
  12.  
  13. #include <ctype.h>
  14. #include <stdio.h>
  15. #include <stdlib.h>
  16. #include <string.h>
  17.  
  18. #include "lua.h"
  19.  
  20. #include "lauxlib.h"
  21. #include "lualib.h"
  22.  
  23.  
  24. static int luaB_print (lua_State *L) {
  25.   int n = lua_gettop(L);  /* number of arguments */
  26.   int i;
  27.   for (i = 1; i <= n; i++) {  /* for each argument */
  28.     size_t l;
  29.     const char *s = luaL_tolstring(L, i, &l);  /* convert it to string */
  30.     if (i > 1)  /* not the first element? */
  31.       lua_writestring("\t", 1);  /* add a tab before it */
  32.     lua_writestring(s, l);  /* print it */
  33.     lua_pop(L, 1);  /* pop result */
  34.   }
  35.   lua_writeline();
  36.   return 0;
  37. }
  38.  
  39.  
  40. /*
  41. ** Creates a warning with all given arguments.
  42. ** Check first for errors; otherwise an error may interrupt
  43. ** the composition of a warning, leaving it unfinished.
  44. */
  45. static int luaB_warn (lua_State *L) {
  46.   int n = lua_gettop(L);  /* number of arguments */
  47.   int i;
  48.   luaL_checkstring(L, 1);  /* at least one argument */
  49.   for (i = 2; i <= n; i++)
  50.     luaL_checkstring(L, i);  /* make sure all arguments are strings */
  51.   for (i = 1; i < n; i++)  /* compose warning */
  52.     lua_warning(L, lua_tostring(L, i), 1);
  53.   lua_warning(L, lua_tostring(L, n), 0);  /* close warning */
  54.   return 0;
  55. }
  56.  
  57.  
  58. #define SPACECHARS      " \f\n\r\t\v"
  59.  
  60. static const char *b_str2int (const char *s, int base, lua_Integer *pn) {
  61.   lua_Unsigned n = 0;
  62.   int neg = 0;
  63.   s += strspn(s, SPACECHARS);  /* skip initial spaces */
  64.   if (*s == '-') { s++; neg = 1; }  /* handle sign */
  65.   else if (*s == '+') s++;
  66.   if (!isalnum((unsigned char)*s))  /* no digit? */
  67.     return NULL;
  68.   do {
  69.     int digit = (isdigit((unsigned char)*s)) ? *s - '0'
  70.                    : (toupper((unsigned char)*s) - 'A') + 10;
  71.     if (digit >= base) return NULL;  /* invalid numeral */
  72.     n = n * base + digit;
  73.     s++;
  74.   } while (isalnum((unsigned char)*s));
  75.   s += strspn(s, SPACECHARS);  /* skip trailing spaces */
  76.   *pn = (lua_Integer)((neg) ? (0u - n) : n);
  77.   return s;
  78. }
  79.  
  80.  
  81. static int luaB_tonumber (lua_State *L) {
  82.   if (lua_isnoneornil(L, 2)) {  /* standard conversion? */
  83.     if (lua_type(L, 1) == LUA_TNUMBER) {  /* already a number? */
  84.       lua_settop(L, 1);  /* yes; return it */
  85.       return 1;
  86.     }
  87.     else {
  88.       size_t l;
  89.       const char *s = lua_tolstring(L, 1, &l);
  90.       if (s != NULL && lua_stringtonumber(L, s) == l + 1)
  91.         return 1;  /* successful conversion to number */
  92.       /* else not a number */
  93.       luaL_checkany(L, 1);  /* (but there must be some parameter) */
  94.     }
  95.   }
  96.   else {
  97.     size_t l;
  98.     const char *s;
  99.     lua_Integer n = 0;  /* to avoid warnings */
  100.     lua_Integer base = luaL_checkinteger(L, 2);
  101.     luaL_checktype(L, 1, LUA_TSTRING);  /* no numbers as strings */
  102.     s = lua_tolstring(L, 1, &l);
  103.     luaL_argcheck(L, 2 <= base && base <= 36, 2, "base out of range");
  104.     if (b_str2int(s, (int)base, &n) == s + l) {
  105.       lua_pushinteger(L, n);
  106.       return 1;
  107.     }  /* else not a number */
  108.   }  /* else not a number */
  109.   luaL_pushfail(L);  /* not a number */
  110.   return 1;
  111. }
  112.  
  113.  
  114. static int luaB_error (lua_State *L) {
  115.   int level = (int)luaL_optinteger(L, 2, 1);
  116.   lua_settop(L, 1);
  117.   if (lua_type(L, 1) == LUA_TSTRING && level > 0) {
  118.     luaL_where(L, level);   /* add extra information */
  119.     lua_pushvalue(L, 1);
  120.     lua_concat(L, 2);
  121.   }
  122.   return lua_error(L);
  123. }
  124.  
  125.  
  126. static int luaB_getmetatable (lua_State *L) {
  127.   luaL_checkany(L, 1);
  128.   if (!lua_getmetatable(L, 1)) {
  129.     lua_pushnil(L);
  130.     return 1;  /* no metatable */
  131.   }
  132.   luaL_getmetafield(L, 1, "__metatable");
  133.   return 1;  /* returns either __metatable field (if present) or metatable */
  134. }
  135.  
  136.  
  137. static int luaB_setmetatable (lua_State *L) {
  138.   int t = lua_type(L, 2);
  139.   luaL_checktype(L, 1, LUA_TTABLE);
  140.   luaL_argexpected(L, t == LUA_TNIL || t == LUA_TTABLE, 2, "nil or table");
  141.   if (l_unlikely(luaL_getmetafield(L, 1, "__metatable") != LUA_TNIL))
  142.     return luaL_error(L, "cannot change a protected metatable");
  143.   lua_settop(L, 2);
  144.   lua_setmetatable(L, 1);
  145.   return 1;
  146. }
  147.  
  148.  
  149. static int luaB_rawequal (lua_State *L) {
  150.   luaL_checkany(L, 1);
  151.   luaL_checkany(L, 2);
  152.   lua_pushboolean(L, lua_rawequal(L, 1, 2));
  153.   return 1;
  154. }
  155.  
  156.  
  157. static int luaB_rawlen (lua_State *L) {
  158.   int t = lua_type(L, 1);
  159.   luaL_argexpected(L, t == LUA_TTABLE || t == LUA_TSTRING, 1,
  160.                       "table or string");
  161.   lua_pushinteger(L, lua_rawlen(L, 1));
  162.   return 1;
  163. }
  164.  
  165.  
  166. static int luaB_rawget (lua_State *L) {
  167.   luaL_checktype(L, 1, LUA_TTABLE);
  168.   luaL_checkany(L, 2);
  169.   lua_settop(L, 2);
  170.   lua_rawget(L, 1);
  171.   return 1;
  172. }
  173.  
  174. static int luaB_rawset (lua_State *L) {
  175.   luaL_checktype(L, 1, LUA_TTABLE);
  176.   luaL_checkany(L, 2);
  177.   luaL_checkany(L, 3);
  178.   lua_settop(L, 3);
  179.   lua_rawset(L, 1);
  180.   return 1;
  181. }
  182.  
  183.  
  184. static int pushmode (lua_State *L, int oldmode) {
  185.   if (oldmode == -1)
  186.     luaL_pushfail(L);  /* invalid call to 'lua_gc' */
  187.   else
  188.     lua_pushstring(L, (oldmode == LUA_GCINC) ? "incremental"
  189.                                              : "generational");
  190.   return 1;
  191. }
  192.  
  193.  
  194. /*
  195. ** check whether call to 'lua_gc' was valid (not inside a finalizer)
  196. */
  197. #define checkvalres(res) { if (res == -1) break; }
  198.  
  199. static int luaB_collectgarbage (lua_State *L) {
  200.   static const char *const opts[] = {"stop", "restart", "collect",
  201.     "count", "step", "setpause", "setstepmul",
  202.     "isrunning", "generational", "incremental", NULL};
  203.   static const int optsnum[] = {LUA_GCSTOP, LUA_GCRESTART, LUA_GCCOLLECT,
  204.     LUA_GCCOUNT, LUA_GCSTEP, LUA_GCSETPAUSE, LUA_GCSETSTEPMUL,
  205.     LUA_GCISRUNNING, LUA_GCGEN, LUA_GCINC};
  206.   int o = optsnum[luaL_checkoption(L, 1, "collect", opts)];
  207.   switch (o) {
  208.     case LUA_GCCOUNT: {
  209.       int k = lua_gc(L, o);
  210.       int b = lua_gc(L, LUA_GCCOUNTB);
  211.       checkvalres(k);
  212.       lua_pushnumber(L, (lua_Number)k + ((lua_Number)b/1024));
  213.       return 1;
  214.     }
  215.     case LUA_GCSTEP: {
  216.       int step = (int)luaL_optinteger(L, 2, 0);
  217.       int res = lua_gc(L, o, step);
  218.       checkvalres(res);
  219.       lua_pushboolean(L, res);
  220.       return 1;
  221.     }
  222.     case LUA_GCSETPAUSE:
  223.     case LUA_GCSETSTEPMUL: {
  224.       int p = (int)luaL_optinteger(L, 2, 0);
  225.       int previous = lua_gc(L, o, p);
  226.       checkvalres(previous);
  227.       lua_pushinteger(L, previous);
  228.       return 1;
  229.     }
  230.     case LUA_GCISRUNNING: {
  231.       int res = lua_gc(L, o);
  232.       checkvalres(res);
  233.       lua_pushboolean(L, res);
  234.       return 1;
  235.     }
  236.     case LUA_GCGEN: {
  237.       int minormul = (int)luaL_optinteger(L, 2, 0);
  238.       int majormul = (int)luaL_optinteger(L, 3, 0);
  239.       return pushmode(L, lua_gc(L, o, minormul, majormul));
  240.     }
  241.     case LUA_GCINC: {
  242.       int pause = (int)luaL_optinteger(L, 2, 0);
  243.       int stepmul = (int)luaL_optinteger(L, 3, 0);
  244.       int stepsize = (int)luaL_optinteger(L, 4, 0);
  245.       return pushmode(L, lua_gc(L, o, pause, stepmul, stepsize));
  246.     }
  247.     default: {
  248.       int res = lua_gc(L, o);
  249.       checkvalres(res);
  250.       lua_pushinteger(L, res);
  251.       return 1;
  252.     }
  253.   }
  254.   luaL_pushfail(L);  /* invalid call (inside a finalizer) */
  255.   return 1;
  256. }
  257.  
  258.  
  259. static int luaB_type (lua_State *L) {
  260.   int t = lua_type(L, 1);
  261.   luaL_argcheck(L, t != LUA_TNONE, 1, "value expected");
  262.   lua_pushstring(L, lua_typename(L, t));
  263.   return 1;
  264. }
  265.  
  266.  
  267. static int luaB_next (lua_State *L) {
  268.   luaL_checktype(L, 1, LUA_TTABLE);
  269.   lua_settop(L, 2);  /* create a 2nd argument if there isn't one */
  270.   if (lua_next(L, 1))
  271.     return 2;
  272.   else {
  273.     lua_pushnil(L);
  274.     return 1;
  275.   }
  276. }
  277.  
  278.  
  279. static int pairscont (lua_State *L, int status, lua_KContext k) {
  280.   (void)L; (void)status; (void)k;  /* unused */
  281.   return 3;
  282. }
  283.  
  284. static int luaB_pairs (lua_State *L) {
  285.   luaL_checkany(L, 1);
  286.   if (luaL_getmetafield(L, 1, "__pairs") == LUA_TNIL) {  /* no metamethod? */
  287.     lua_pushcfunction(L, luaB_next);  /* will return generator, */
  288.     lua_pushvalue(L, 1);  /* state, */
  289.     lua_pushnil(L);  /* and initial value */
  290.   }
  291.   else {
  292.     lua_pushvalue(L, 1);  /* argument 'self' to metamethod */
  293.     lua_callk(L, 1, 3, 0, pairscont);  /* get 3 values from metamethod */
  294.   }
  295.   return 3;
  296. }
  297.  
  298.  
  299. /*
  300. ** Traversal function for 'ipairs'
  301. */
  302. static int ipairsaux (lua_State *L) {
  303.   lua_Integer i = luaL_checkinteger(L, 2);
  304.   i = luaL_intop(+, i, 1);
  305.   lua_pushinteger(L, i);
  306.   return (lua_geti(L, 1, i) == LUA_TNIL) ? 1 : 2;
  307. }
  308.  
  309.  
  310. /*
  311. ** 'ipairs' function. Returns 'ipairsaux', given "table", 0.
  312. ** (The given "table" may not be a table.)
  313. */
  314. static int luaB_ipairs (lua_State *L) {
  315.   luaL_checkany(L, 1);
  316.   lua_pushcfunction(L, ipairsaux);  /* iteration function */
  317.   lua_pushvalue(L, 1);  /* state */
  318.   lua_pushinteger(L, 0);  /* initial value */
  319.   return 3;
  320. }
  321.  
  322.  
  323. static int load_aux (lua_State *L, int status, int envidx) {
  324.   if (l_likely(status == LUA_OK)) {
  325.     if (envidx != 0) {  /* 'env' parameter? */
  326.       lua_pushvalue(L, envidx);  /* environment for loaded function */
  327.       if (!lua_setupvalue(L, -2, 1))  /* set it as 1st upvalue */
  328.         lua_pop(L, 1);  /* remove 'env' if not used by previous call */
  329.     }
  330.     return 1;
  331.   }
  332.   else {  /* error (message is on top of the stack) */
  333.     luaL_pushfail(L);
  334.     lua_insert(L, -2);  /* put before error message */
  335.     return 2;  /* return fail plus error message */
  336.   }
  337. }
  338.  
  339.  
  340. static int luaB_loadfile (lua_State *L) {
  341.   const char *fname = luaL_optstring(L, 1, NULL);
  342.   const char *mode = luaL_optstring(L, 2, NULL);
  343.   int env = (!lua_isnone(L, 3) ? 3 : 0);  /* 'env' index or 0 if no 'env' */
  344.   int status = luaL_loadfilex(L, fname, mode);
  345.   return load_aux(L, status, env);
  346. }
  347.  
  348.  
  349. /*
  350. ** {======================================================
  351. ** Generic Read function
  352. ** =======================================================
  353. */
  354.  
  355.  
  356. /*
  357. ** reserved slot, above all arguments, to hold a copy of the returned
  358. ** string to avoid it being collected while parsed. 'load' has four
  359. ** optional arguments (chunk, source name, mode, and environment).
  360. */
  361. #define RESERVEDSLOT    5
  362.  
  363.  
  364. /*
  365. ** Reader for generic 'load' function: 'lua_load' uses the
  366. ** stack for internal stuff, so the reader cannot change the
  367. ** stack top. Instead, it keeps its resulting string in a
  368. ** reserved slot inside the stack.
  369. */
  370. static const char *generic_reader (lua_State *L, void *ud, size_t *size) {
  371.   (void)(ud);  /* not used */
  372.   luaL_checkstack(L, 2, "too many nested functions");
  373.   lua_pushvalue(L, 1);  /* get function */
  374.   lua_call(L, 0, 1);  /* call it */
  375.   if (lua_isnil(L, -1)) {
  376.     lua_pop(L, 1);  /* pop result */
  377.     *size = 0;
  378.     return NULL;
  379.   }
  380.   else if (l_unlikely(!lua_isstring(L, -1)))
  381.     luaL_error(L, "reader function must return a string");
  382.   lua_replace(L, RESERVEDSLOT);  /* save string in reserved slot */
  383.   return lua_tolstring(L, RESERVEDSLOT, size);
  384. }
  385.  
  386.  
  387. static int luaB_load (lua_State *L) {
  388.   int status;
  389.   size_t l;
  390.   const char *s = lua_tolstring(L, 1, &l);
  391.   const char *mode = luaL_optstring(L, 3, "bt");
  392.   int env = (!lua_isnone(L, 4) ? 4 : 0);  /* 'env' index or 0 if no 'env' */
  393.   if (s != NULL) {  /* loading a string? */
  394.     const char *chunkname = luaL_optstring(L, 2, s);
  395.     status = luaL_loadbufferx(L, s, l, chunkname, mode);
  396.   }
  397.   else {  /* loading from a reader function */
  398.     const char *chunkname = luaL_optstring(L, 2, "=(load)");
  399.     luaL_checktype(L, 1, LUA_TFUNCTION);
  400.     lua_settop(L, RESERVEDSLOT);  /* create reserved slot */
  401.     status = lua_load(L, generic_reader, NULL, chunkname, mode);
  402.   }
  403.   return load_aux(L, status, env);
  404. }
  405.  
  406. /* }====================================================== */
  407.  
  408.  
  409. static int dofilecont (lua_State *L, int d1, lua_KContext d2) {
  410.   (void)d1;  (void)d2;  /* only to match 'lua_Kfunction' prototype */
  411.   return lua_gettop(L) - 1;
  412. }
  413.  
  414.  
  415. static int luaB_dofile (lua_State *L) {
  416.   const char *fname = luaL_optstring(L, 1, NULL);
  417.   lua_settop(L, 1);
  418.   if (l_unlikely(luaL_loadfile(L, fname) != LUA_OK))
  419.     return lua_error(L);
  420.   lua_callk(L, 0, LUA_MULTRET, 0, dofilecont);
  421.   return dofilecont(L, 0, 0);
  422. }
  423.  
  424.  
  425. static int luaB_assert (lua_State *L) {
  426.   if (l_likely(lua_toboolean(L, 1)))  /* condition is true? */
  427.     return lua_gettop(L);  /* return all arguments */
  428.   else {  /* error */
  429.     luaL_checkany(L, 1);  /* there must be a condition */
  430.     lua_remove(L, 1);  /* remove it */
  431.     lua_pushliteral(L, "assertion failed!");  /* default message */
  432.     lua_settop(L, 1);  /* leave only message (default if no other one) */
  433.     return luaB_error(L);  /* call 'error' */
  434.   }
  435. }
  436.  
  437.  
  438. static int luaB_select (lua_State *L) {
  439.   int n = lua_gettop(L);
  440.   if (lua_type(L, 1) == LUA_TSTRING && *lua_tostring(L, 1) == '#') {
  441.     lua_pushinteger(L, n-1);
  442.     return 1;
  443.   }
  444.   else {
  445.     lua_Integer i = luaL_checkinteger(L, 1);
  446.     if (i < 0) i = n + i;
  447.     else if (i > n) i = n;
  448.     luaL_argcheck(L, 1 <= i, 1, "index out of range");
  449.     return n - (int)i;
  450.   }
  451. }
  452.  
  453.  
  454. /*
  455. ** Continuation function for 'pcall' and 'xpcall'. Both functions
  456. ** already pushed a 'true' before doing the call, so in case of success
  457. ** 'finishpcall' only has to return everything in the stack minus
  458. ** 'extra' values (where 'extra' is exactly the number of items to be
  459. ** ignored).
  460. */
  461. static int finishpcall (lua_State *L, int status, lua_KContext extra) {
  462.   if (l_unlikely(status != LUA_OK && status != LUA_YIELD)) {  /* error? */
  463.     lua_pushboolean(L, 0);  /* first result (false) */
  464.     lua_pushvalue(L, -2);  /* error message */
  465.     return 2;  /* return false, msg */
  466.   }
  467.   else
  468.     return lua_gettop(L) - (int)extra;  /* return all results */
  469. }
  470.  
  471.  
  472. static int luaB_pcall (lua_State *L) {
  473.   int status;
  474.   luaL_checkany(L, 1);
  475.   lua_pushboolean(L, 1);  /* first result if no errors */
  476.   lua_insert(L, 1);  /* put it in place */
  477.   status = lua_pcallk(L, lua_gettop(L) - 2, LUA_MULTRET, 0, 0, finishpcall);
  478.   return finishpcall(L, status, 0);
  479. }
  480.  
  481.  
  482. /*
  483. ** Do a protected call with error handling. After 'lua_rotate', the
  484. ** stack will have <f, err, true, f, [args...]>; so, the function passes
  485. ** 2 to 'finishpcall' to skip the 2 first values when returning results.
  486. */
  487. static int luaB_xpcall (lua_State *L) {
  488.   int status;
  489.   int n = lua_gettop(L);
  490.   luaL_checktype(L, 2, LUA_TFUNCTION);  /* check error function */
  491.   lua_pushboolean(L, 1);  /* first result */
  492.   lua_pushvalue(L, 1);  /* function */
  493.   lua_rotate(L, 3, 2);  /* move them below function's arguments */
  494.   status = lua_pcallk(L, n - 2, LUA_MULTRET, 2, 2, finishpcall);
  495.   return finishpcall(L, status, 2);
  496. }
  497.  
  498.  
  499. static int luaB_tostring (lua_State *L) {
  500.   luaL_checkany(L, 1);
  501.   luaL_tolstring(L, 1, NULL);
  502.   return 1;
  503. }
  504.  
  505.  
  506. static const luaL_Reg base_funcs[] = {
  507.   {"assert", luaB_assert},
  508.   {"collectgarbage", luaB_collectgarbage},
  509.   {"dofile", luaB_dofile},
  510.   {"error", luaB_error},
  511.   {"getmetatable", luaB_getmetatable},
  512.   {"ipairs", luaB_ipairs},
  513.   {"loadfile", luaB_loadfile},
  514.   {"load", luaB_load},
  515.   {"next", luaB_next},
  516.   {"pairs", luaB_pairs},
  517.   {"pcall", luaB_pcall},
  518.   {"print", luaB_print},
  519.   {"warn", luaB_warn},
  520.   {"rawequal", luaB_rawequal},
  521.   {"rawlen", luaB_rawlen},
  522.   {"rawget", luaB_rawget},
  523.   {"rawset", luaB_rawset},
  524.   {"select", luaB_select},
  525.   {"setmetatable", luaB_setmetatable},
  526.   {"tonumber", luaB_tonumber},
  527.   {"tostring", luaB_tostring},
  528.   {"type", luaB_type},
  529.   {"xpcall", luaB_xpcall},
  530.   /* placeholders */
  531.   {LUA_GNAME, NULL},
  532.   {"_VERSION", NULL},
  533.   {NULL, NULL}
  534. };
  535.  
  536.  
  537. LUAMOD_API int luaopen_base (lua_State *L) {
  538.   /* open lib into global table */
  539.   lua_pushglobaltable(L);
  540.   luaL_setfuncs(L, base_funcs, 0);
  541.   /* set global _G */
  542.   lua_pushvalue(L, -1);
  543.   lua_setfield(L, -2, LUA_GNAME);
  544.   /* set global _VERSION */
  545.   lua_pushliteral(L, LUA_VERSION);
  546.   lua_setfield(L, -2, "_VERSION");
  547.   return 1;
  548. }
  549.  
  550.