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| 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 |
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