nanocoat/lib/3rdparty/lua/lbaselib.c

   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