git.zerfleddert.de Git - proxmark3-svn/blob - liblua/lbaselib.c

   1 /*
   2 ** $Id: lbaselib.c,v 1.276 2013/02/21 13:44:53 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 static int luaB_print (lua_State *L) {
  24   int n = lua_gettop(L);  /* number of arguments */
  25   int i;
  26   lua_getglobal(L, "tostring");
  27   for (i=1; i<=n; i++) {
  28     const char *s;
  29     size_t l;
  30     lua_pushvalue(L, -1);  /* function to be called */
  31     lua_pushvalue(L, i);   /* value to print */
  32     lua_call(L, 1, 1);
  33     s = lua_tolstring(L, -1, &l);  /* get result */
  34     if (s == NULL)
  35       return luaL_error(L,
  36          LUA_QL("tostring") " must return a string to " LUA_QL("print"));
  37     if (i>1) luai_writestring("\t", 1);
  38     luai_writestring(s, l);
  39     lua_pop(L, 1);  /* pop result */
  40   }
  41   luai_writeline();
  42   return 0;
  43 }
  44
  45
  46 #define SPACECHARS      " \f\n\r\t\v"
  47
  48 static int luaB_tonumber (lua_State *L) {
  49   if (lua_isnoneornil(L, 2)) {  /* standard conversion */
  50     int isnum;
  51     lua_Number n = lua_tonumberx(L, 1, &isnum);
  52     if (isnum) {
  53       lua_pushnumber(L, n);
  54       return 1;
  55     }  /* else not a number; must be something */
  56     luaL_checkany(L, 1);
  57   }
  58   else {
  59     size_t l;
  60     const char *s = luaL_checklstring(L, 1, &l);
  61     const char *e = s + l;  /* end point for 's' */
  62     int base = luaL_checkint(L, 2);
  63     int neg = 0;
  64     luaL_argcheck(L, 2 <= base && base <= 36, 2, "base out of range");
  65     s += strspn(s, SPACECHARS);  /* skip initial spaces */
  66     if (*s == '-') { s++; neg = 1; }  /* handle signal */
  67     else if (*s == '+') s++;
  68     if (isalnum((unsigned char)*s)) {
  69       lua_Number n = 0;
  70       do {
  71         int digit = (isdigit((unsigned char)*s)) ? *s - '0'
  72                        : toupper((unsigned char)*s) - 'A' + 10;
  73         if (digit >= base) break;  /* invalid numeral; force a fail */
  74         n = n * (lua_Number)base + (lua_Number)digit;
  75         s++;
  76       } while (isalnum((unsigned char)*s));
  77       s += strspn(s, SPACECHARS);  /* skip trailing spaces */
  78       if (s == e) {  /* no invalid trailing characters? */
  79         lua_pushnumber(L, (neg) ? -n : n);
  80         return 1;
  81       }  /* else not a number */
  82     }  /* else not a number */
  83   }
  84   lua_pushnil(L);  /* not a number */
  85   return 1;
  86 }
  87
  88
  89 static int luaB_error (lua_State *L) {
  90   int level = luaL_optint(L, 2, 1);
  91   lua_settop(L, 1);
  92   if (lua_isstring(L, 1) && level > 0) {  /* add extra information? */
  93     luaL_where(L, level);
  94     lua_pushvalue(L, 1);
  95     lua_concat(L, 2);
  96   }
  97   return lua_error(L);
  98 }
  99
 100
 101 static int luaB_getmetatable (lua_State *L) {
 102   luaL_checkany(L, 1);
 103   if (!lua_getmetatable(L, 1)) {
 104     lua_pushnil(L);
 105     return 1;  /* no metatable */
 106   }
 107   luaL_getmetafield(L, 1, "__metatable");
 108   return 1;  /* returns either __metatable field (if present) or metatable */
 109 }
 110
 111
 112 static int luaB_setmetatable (lua_State *L) {
 113   int t = lua_type(L, 2);
 114   luaL_checktype(L, 1, LUA_TTABLE);
 115   luaL_argcheck(L, t == LUA_TNIL || t == LUA_TTABLE, 2,
 116                     "nil or table expected");
 117   if (luaL_getmetafield(L, 1, "__metatable"))
 118     return luaL_error(L, "cannot change a protected metatable");
 119   lua_settop(L, 2);
 120   lua_setmetatable(L, 1);
 121   return 1;
 122 }
 123
 124
 125 static int luaB_rawequal (lua_State *L) {
 126   luaL_checkany(L, 1);
 127   luaL_checkany(L, 2);
 128   lua_pushboolean(L, lua_rawequal(L, 1, 2));
 129   return 1;
 130 }
 131
 132
 133 static int luaB_rawlen (lua_State *L) {
 134   int t = lua_type(L, 1);
 135   luaL_argcheck(L, t == LUA_TTABLE || t == LUA_TSTRING, 1,
 136                    "table or string expected");
 137   lua_pushinteger(L, lua_rawlen(L, 1));
 138   return 1;
 139 }
 140
 141
 142 static int luaB_rawget (lua_State *L) {
 143   luaL_checktype(L, 1, LUA_TTABLE);
 144   luaL_checkany(L, 2);
 145   lua_settop(L, 2);
 146   lua_rawget(L, 1);
 147   return 1;
 148 }
 149
 150 static int luaB_rawset (lua_State *L) {
 151   luaL_checktype(L, 1, LUA_TTABLE);
 152   luaL_checkany(L, 2);
 153   luaL_checkany(L, 3);
 154   lua_settop(L, 3);
 155   lua_rawset(L, 1);
 156   return 1;
 157 }
 158
 159
 160 static int luaB_collectgarbage (lua_State *L) {
 161   static const char *const opts[] = {"stop", "restart", "collect",
 162     "count", "step", "setpause", "setstepmul",
 163     "setmajorinc", "isrunning", "generational", "incremental", NULL};
 164   static const int optsnum[] = {LUA_GCSTOP, LUA_GCRESTART, LUA_GCCOLLECT,
 165     LUA_GCCOUNT, LUA_GCSTEP, LUA_GCSETPAUSE, LUA_GCSETSTEPMUL,
 166     LUA_GCSETMAJORINC, LUA_GCISRUNNING, LUA_GCGEN, LUA_GCINC};
 167   int o = optsnum[luaL_checkoption(L, 1, "collect", opts)];
 168   int ex = luaL_optint(L, 2, 0);
 169   int res = lua_gc(L, o, ex);
 170   switch (o) {
 171     case LUA_GCCOUNT: {
 172       int b = lua_gc(L, LUA_GCCOUNTB, 0);
 173       lua_pushnumber(L, res + ((lua_Number)b/1024));
 174       lua_pushinteger(L, b);
 175       return 2;
 176     }
 177     case LUA_GCSTEP: case LUA_GCISRUNNING: {
 178       lua_pushboolean(L, res);
 179       return 1;
 180     }
 181     default: {
 182       lua_pushinteger(L, res);
 183       return 1;
 184     }
 185   }
 186 }
 187
 188
 189 static int luaB_type (lua_State *L) {
 190   luaL_checkany(L, 1);
 191   lua_pushstring(L, luaL_typename(L, 1));
 192   return 1;
 193 }
 194
 195
 196 static int pairsmeta (lua_State *L, const char *method, int iszero,
 197                       lua_CFunction iter) {
 198   if (!luaL_getmetafield(L, 1, method)) {  /* no metamethod? */
 199     luaL_checktype(L, 1, LUA_TTABLE);  /* argument must be a table */
 200     lua_pushcfunction(L, iter);  /* will return generator, */
 201     lua_pushvalue(L, 1);  /* state, */
 202     if (iszero) lua_pushinteger(L, 0);  /* and initial value */
 203     else lua_pushnil(L);
 204   }
 205   else {
 206     lua_pushvalue(L, 1);  /* argument 'self' to metamethod */
 207     lua_call(L, 1, 3);  /* get 3 values from metamethod */
 208   }
 209   return 3;
 210 }
 211
 212
 213 static int luaB_next (lua_State *L) {
 214   luaL_checktype(L, 1, LUA_TTABLE);
 215   lua_settop(L, 2);  /* create a 2nd argument if there isn't one */
 216   if (lua_next(L, 1))
 217     return 2;
 218   else {
 219     lua_pushnil(L);
 220     return 1;
 221   }
 222 }
 223
 224
 225 static int luaB_pairs (lua_State *L) {
 226   return pairsmeta(L, "__pairs", 0, luaB_next);
 227 }
 228
 229
 230 static int ipairsaux (lua_State *L) {
 231   int i = luaL_checkint(L, 2);
 232   luaL_checktype(L, 1, LUA_TTABLE);
 233   i++;  /* next value */
 234   lua_pushinteger(L, i);
 235   lua_rawgeti(L, 1, i);
 236   return (lua_isnil(L, -1)) ? 1 : 2;
 237 }
 238
 239
 240 static int luaB_ipairs (lua_State *L) {
 241   return pairsmeta(L, "__ipairs", 1, ipairsaux);
 242 }
 243
 244
 245 static int load_aux (lua_State *L, int status, int envidx) {
 246   if (status == LUA_OK) {
 247     if (envidx != 0) {  /* 'env' parameter? */
 248       lua_pushvalue(L, envidx);  /* environment for loaded function */
 249       if (!lua_setupvalue(L, -2, 1))  /* set it as 1st upvalue */
 250         lua_pop(L, 1);  /* remove 'env' if not used by previous call */
 251     }
 252     return 1;
 253   }
 254   else {  /* error (message is on top of the stack) */
 255     lua_pushnil(L);
 256     lua_insert(L, -2);  /* put before error message */
 257     return 2;  /* return nil plus error message */
 258   }
 259 }
 260
 261
 262 static int luaB_loadfile (lua_State *L) {
 263   const char *fname = luaL_optstring(L, 1, NULL);
 264   const char *mode = luaL_optstring(L, 2, NULL);
 265   int env = (!lua_isnone(L, 3) ? 3 : 0);  /* 'env' index or 0 if no 'env' */
 266   int status = luaL_loadfilex(L, fname, mode);
 267   return load_aux(L, status, env);
 268 }
 269
 270
 271 /*
 272 ** {======================================================
 273 ** Generic Read function
 274 ** =======================================================
 275 */
 276
 277
 278 /*
 279 ** reserved slot, above all arguments, to hold a copy of the returned
 280 ** string to avoid it being collected while parsed. 'load' has four
 281 ** optional arguments (chunk, source name, mode, and environment).
 282 */
 283 #define RESERVEDSLOT    5
 284
 285
 286 /*
 287 ** Reader for generic `load' function: `lua_load' uses the
 288 ** stack for internal stuff, so the reader cannot change the
 289 ** stack top. Instead, it keeps its resulting string in a
 290 ** reserved slot inside the stack.
 291 */
 292 static const char *generic_reader (lua_State *L, void *ud, size_t *size) {
 293   (void)(ud);  /* not used */
 294   luaL_checkstack(L, 2, "too many nested functions");
 295   lua_pushvalue(L, 1);  /* get function */
 296   lua_call(L, 0, 1);  /* call it */
 297   if (lua_isnil(L, -1)) {
 298     lua_pop(L, 1);  /* pop result */
 299     *size = 0;
 300     return NULL;
 301   }
 302   else if (!lua_isstring(L, -1))
 303     luaL_error(L, "reader function must return a string");
 304   lua_replace(L, RESERVEDSLOT);  /* save string in reserved slot */
 305   return lua_tolstring(L, RESERVEDSLOT, size);
 306 }
 307
 308
 309 static int luaB_load (lua_State *L) {
 310   int status;
 311   size_t l;
 312   const char *s = lua_tolstring(L, 1, &l);
 313   const char *mode = luaL_optstring(L, 3, "bt");
 314   int env = (!lua_isnone(L, 4) ? 4 : 0);  /* 'env' index or 0 if no 'env' */
 315   if (s != NULL) {  /* loading a string? */
 316     const char *chunkname = luaL_optstring(L, 2, s);
 317     status = luaL_loadbufferx(L, s, l, chunkname, mode);
 318   }
 319   else {  /* loading from a reader function */
 320     const char *chunkname = luaL_optstring(L, 2, "=(load)");
 321     luaL_checktype(L, 1, LUA_TFUNCTION);
 322     lua_settop(L, RESERVEDSLOT);  /* create reserved slot */
 323     status = lua_load(L, generic_reader, NULL, chunkname, mode);
 324   }
 325   return load_aux(L, status, env);
 326 }
 327
 328 /* }====================================================== */
 329
 330
 331 static int dofilecont (lua_State *L) {
 332   return lua_gettop(L) - 1;
 333 }
 334
 335
 336 static int luaB_dofile (lua_State *L) {
 337   const char *fname = luaL_optstring(L, 1, NULL);
 338   lua_settop(L, 1);
 339   if (luaL_loadfile(L, fname) != LUA_OK)
 340     return lua_error(L);
 341   lua_callk(L, 0, LUA_MULTRET, 0, dofilecont);
 342   return dofilecont(L);
 343 }
 344
 345
 346 static int luaB_assert (lua_State *L) {
 347   if (!lua_toboolean(L, 1))
 348     return luaL_error(L, "%s", luaL_optstring(L, 2, "assertion failed!"));
 349   return lua_gettop(L);
 350 }
 351
 352
 353 static int luaB_select (lua_State *L) {
 354   int n = lua_gettop(L);
 355   if (lua_type(L, 1) == LUA_TSTRING && *lua_tostring(L, 1) == '#') {
 356     lua_pushinteger(L, n-1);
 357     return 1;
 358   }
 359   else {
 360     int i = luaL_checkint(L, 1);
 361     if (i < 0) i = n + i;
 362     else if (i > n) i = n;
 363     luaL_argcheck(L, 1 <= i, 1, "index out of range");
 364     return n - i;
 365   }
 366 }
 367
 368
 369 static int finishpcall (lua_State *L, int status) {
 370   if (!lua_checkstack(L, 1)) {  /* no space for extra boolean? */
 371     lua_settop(L, 0);  /* create space for return values */
 372     lua_pushboolean(L, 0);
 373     lua_pushstring(L, "stack overflow");
 374     return 2;  /* return false, msg */
 375   }
 376   lua_pushboolean(L, status);  /* first result (status) */
 377   lua_replace(L, 1);  /* put first result in first slot */
 378   return lua_gettop(L);
 379 }
 380
 381
 382 static int pcallcont (lua_State *L) {
 383   int status = lua_getctx(L, NULL);
 384   return finishpcall(L, (status == LUA_YIELD));
 385 }
 386
 387
 388 static int luaB_pcall (lua_State *L) {
 389   int status;
 390   luaL_checkany(L, 1);
 391   lua_pushnil(L);
 392   lua_insert(L, 1);  /* create space for status result */
 393   status = lua_pcallk(L, lua_gettop(L) - 2, LUA_MULTRET, 0, 0, pcallcont);
 394   return finishpcall(L, (status == LUA_OK));
 395 }
 396
 397
 398 static int luaB_xpcall (lua_State *L) {
 399   int status;
 400   int n = lua_gettop(L);
 401   luaL_argcheck(L, n >= 2, 2, "value expected");
 402   lua_pushvalue(L, 1);  /* exchange function... */
 403   lua_copy(L, 2, 1);  /* ...and error handler */
 404   lua_replace(L, 2);
 405   status = lua_pcallk(L, n - 2, LUA_MULTRET, 1, 0, pcallcont);
 406   return finishpcall(L, (status == LUA_OK));
 407 }
 408
 409
 410 static int luaB_tostring (lua_State *L) {
 411   luaL_checkany(L, 1);
 412   luaL_tolstring(L, 1, NULL);
 413   return 1;
 414 }
 415
 416
 417 static const luaL_Reg base_funcs[] = {
 418   {"assert", luaB_assert},
 419   {"collectgarbage", luaB_collectgarbage},
 420   {"dofile", luaB_dofile},
 421   {"error", luaB_error},
 422   {"getmetatable", luaB_getmetatable},
 423   {"ipairs", luaB_ipairs},
 424   {"loadfile", luaB_loadfile},
 425   {"load", luaB_load},
 426 #if defined(LUA_COMPAT_LOADSTRING)
 427   {"loadstring", luaB_load},
 428 #endif
 429   {"next", luaB_next},
 430   {"pairs", luaB_pairs},
 431   {"pcall", luaB_pcall},
 432   {"print", luaB_print},
 433   {"rawequal", luaB_rawequal},
 434   {"rawlen", luaB_rawlen},
 435   {"rawget", luaB_rawget},
 436   {"rawset", luaB_rawset},
 437   {"select", luaB_select},
 438   {"setmetatable", luaB_setmetatable},
 439   {"tonumber", luaB_tonumber},
 440   {"tostring", luaB_tostring},
 441   {"type", luaB_type},
 442   {"xpcall", luaB_xpcall},
 443   {NULL, NULL}
 444 };
 445
 446
 447 LUAMOD_API int luaopen_base (lua_State *L) {
 448   /* set global _G */
 449   lua_pushglobaltable(L);
 450   lua_pushglobaltable(L);
 451   lua_setfield(L, -2, "_G");
 452   /* open lib into global table */
 453   luaL_setfuncs(L, base_funcs, 0);
 454   lua_pushliteral(L, LUA_VERSION);
 455   lua_setfield(L, -2, "_VERSION");  /* set global _VERSION */
 456   return 1;
 457 }
 458