| 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 | |