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lbaselib.c 13 KB

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  1. /*
  2. ** $Id: lbaselib.c,v 1.314 2016/09/05 19:06:34 roberto Exp $
  3. ** Basic library
  4. ** See Copyright Notice in lua.h
  5. */
  6. #define lbaselib_c
  7. #define LUA_LIB
  8. #include "lprefix.h"
  9. #include <ctype.h>
  10. #include <stdio.h>
  11. #include <stdlib.h>
  12. #include <string.h>
  13. #include "lua.h"
  14. #include "lauxlib.h"
  15. #include "lualib.h"
  16. static int luaB_print (lua_State *L) {
  17. int n = lua_gettop(L); /* number of arguments */
  18. int i;
  19. lua_getglobal(L, "tostring");
  20. for (i=1; i<=n; i++) {
  21. const char *s;
  22. size_t l;
  23. lua_pushvalue(L, -1); /* function to be called */
  24. lua_pushvalue(L, i); /* value to print */
  25. lua_call(L, 1, 1);
  26. s = lua_tolstring(L, -1, &l); /* get result */
  27. if (s == NULL)
  28. return luaL_error(L, "'tostring' must return a string to 'print'");
  29. if (i>1) lua_writestring("\t", 1);
  30. lua_writestring(s, l);
  31. lua_pop(L, 1); /* pop result */
  32. }
  33. lua_writeline();
  34. return 0;
  35. }
  36. #define SPACECHARS " \f\n\r\t\v"
  37. static const char *b_str2int (const char *s, int base, lua_Integer *pn) {
  38. lua_Unsigned n = 0;
  39. int neg = 0;
  40. s += strspn(s, SPACECHARS); /* skip initial spaces */
  41. if (*s == '-') { s++; neg = 1; } /* handle signal */
  42. else if (*s == '+') s++;
  43. if (!isalnum((unsigned char)*s)) /* no digit? */
  44. return NULL;
  45. do {
  46. int digit = (isdigit((unsigned char)*s)) ? *s - '0'
  47. : (toupper((unsigned char)*s) - 'A') + 10;
  48. if (digit >= base) return NULL; /* invalid numeral */
  49. n = n * base + digit;
  50. s++;
  51. } while (isalnum((unsigned char)*s));
  52. s += strspn(s, SPACECHARS); /* skip trailing spaces */
  53. *pn = (lua_Integer)((neg) ? (0u - n) : n);
  54. return s;
  55. }
  56. static int luaB_tonumber (lua_State *L) {
  57. if (lua_isnoneornil(L, 2)) { /* standard conversion? */
  58. luaL_checkany(L, 1);
  59. if (lua_type(L, 1) == LUA_TNUMBER) { /* already a number? */
  60. lua_settop(L, 1); /* yes; return it */
  61. return 1;
  62. }
  63. else {
  64. size_t l;
  65. const char *s = lua_tolstring(L, 1, &l);
  66. if (s != NULL && lua_stringtonumber(L, s) == l + 1)
  67. return 1; /* successful conversion to number */
  68. /* else not a number */
  69. }
  70. }
  71. else {
  72. size_t l;
  73. const char *s;
  74. lua_Integer n = 0; /* to avoid warnings */
  75. lua_Integer base = luaL_checkinteger(L, 2);
  76. luaL_checktype(L, 1, LUA_TSTRING); /* no numbers as strings */
  77. s = lua_tolstring(L, 1, &l);
  78. luaL_argcheck(L, 2 <= base && base <= 36, 2, "base out of range");
  79. if (b_str2int(s, (int)base, &n) == s + l) {
  80. lua_pushinteger(L, n);
  81. return 1;
  82. } /* else not a number */
  83. } /* else not a number */
  84. lua_pushnil(L); /* not a number */
  85. return 1;
  86. }
  87. static int luaB_error (lua_State *L) {
  88. int level = (int)luaL_optinteger(L, 2, 1);
  89. lua_settop(L, 1);
  90. if (lua_type(L, 1) == LUA_TSTRING && level > 0) {
  91. luaL_where(L, level); /* add extra information */
  92. lua_pushvalue(L, 1);
  93. lua_concat(L, 2);
  94. }
  95. return lua_error(L);
  96. }
  97. static int luaB_getmetatable (lua_State *L) {
  98. luaL_checkany(L, 1);
  99. if (!lua_getmetatable(L, 1)) {
  100. lua_pushnil(L);
  101. return 1; /* no metatable */
  102. }
  103. luaL_getmetafield(L, 1, "__metatable");
  104. return 1; /* returns either __metatable field (if present) or metatable */
  105. }
  106. static int luaB_setmetatable (lua_State *L) {
  107. int t = lua_type(L, 2);
  108. luaL_checktype(L, 1, LUA_TTABLE);
  109. luaL_argcheck(L, t == LUA_TNIL || t == LUA_TTABLE, 2,
  110. "nil or table expected");
  111. if (luaL_getmetafield(L, 1, "__metatable") != LUA_TNIL)
  112. return luaL_error(L, "cannot change a protected metatable");
  113. lua_settop(L, 2);
  114. lua_setmetatable(L, 1);
  115. return 1;
  116. }
  117. static int luaB_rawequal (lua_State *L) {
  118. luaL_checkany(L, 1);
  119. luaL_checkany(L, 2);
  120. lua_pushboolean(L, lua_rawequal(L, 1, 2));
  121. return 1;
  122. }
  123. static int luaB_rawlen (lua_State *L) {
  124. int t = lua_type(L, 1);
  125. luaL_argcheck(L, t == LUA_TTABLE || t == LUA_TSTRING, 1,
  126. "table or string expected");
  127. lua_pushinteger(L, lua_rawlen(L, 1));
  128. return 1;
  129. }
  130. static int luaB_rawget (lua_State *L) {
  131. luaL_checktype(L, 1, LUA_TTABLE);
  132. luaL_checkany(L, 2);
  133. lua_settop(L, 2);
  134. lua_rawget(L, 1);
  135. return 1;
  136. }
  137. static int luaB_rawset (lua_State *L) {
  138. luaL_checktype(L, 1, LUA_TTABLE);
  139. luaL_checkany(L, 2);
  140. luaL_checkany(L, 3);
  141. lua_settop(L, 3);
  142. lua_rawset(L, 1);
  143. return 1;
  144. }
  145. static int luaB_collectgarbage (lua_State *L) {
  146. static const char *const opts[] = {"stop", "restart", "collect",
  147. "count", "step", "setpause", "setstepmul",
  148. "isrunning", NULL};
  149. static const int optsnum[] = {LUA_GCSTOP, LUA_GCRESTART, LUA_GCCOLLECT,
  150. LUA_GCCOUNT, LUA_GCSTEP, LUA_GCSETPAUSE, LUA_GCSETSTEPMUL,
  151. LUA_GCISRUNNING};
  152. int o = optsnum[luaL_checkoption(L, 1, "collect", opts)];
  153. int ex = (int)luaL_optinteger(L, 2, 0);
  154. int res = lua_gc(L, o, ex);
  155. switch (o) {
  156. case LUA_GCCOUNT: {
  157. int b = lua_gc(L, LUA_GCCOUNTB, 0);
  158. lua_pushnumber(L, (lua_Number)res + ((lua_Number)b/1024));
  159. return 1;
  160. }
  161. case LUA_GCSTEP: case LUA_GCISRUNNING: {
  162. lua_pushboolean(L, res);
  163. return 1;
  164. }
  165. default: {
  166. lua_pushinteger(L, res);
  167. return 1;
  168. }
  169. }
  170. }
  171. static int luaB_type (lua_State *L) {
  172. int t = lua_type(L, 1);
  173. luaL_argcheck(L, t != LUA_TNONE, 1, "value expected");
  174. lua_pushstring(L, lua_typename(L, t));
  175. return 1;
  176. }
  177. static int pairsmeta (lua_State *L, const char *method, int iszero,
  178. lua_CFunction iter) {
  179. luaL_checkany(L, 1);
  180. if (luaL_getmetafield(L, 1, method) == LUA_TNIL) { /* no metamethod? */
  181. lua_pushcfunction(L, iter); /* will return generator, */
  182. lua_pushvalue(L, 1); /* state, */
  183. if (iszero) lua_pushinteger(L, 0); /* and initial value */
  184. else lua_pushnil(L);
  185. }
  186. else {
  187. lua_pushvalue(L, 1); /* argument 'self' to metamethod */
  188. lua_call(L, 1, 3); /* get 3 values from metamethod */
  189. }
  190. return 3;
  191. }
  192. static int luaB_next (lua_State *L) {
  193. luaL_checktype(L, 1, LUA_TTABLE);
  194. lua_settop(L, 2); /* create a 2nd argument if there isn't one */
  195. if (lua_next(L, 1))
  196. return 2;
  197. else {
  198. lua_pushnil(L);
  199. return 1;
  200. }
  201. }
  202. static int luaB_pairs (lua_State *L) {
  203. return pairsmeta(L, "__pairs", 0, luaB_next);
  204. }
  205. /*
  206. ** Traversal function for 'ipairs'
  207. */
  208. static int ipairsaux (lua_State *L) {
  209. lua_Integer i = luaL_checkinteger(L, 2) + 1;
  210. lua_pushinteger(L, i);
  211. return (lua_geti(L, 1, i) == LUA_TNIL) ? 1 : 2;
  212. }
  213. /*
  214. ** 'ipairs' function. Returns 'ipairsaux', given "table", 0.
  215. ** (The given "table" may not be a table.)
  216. */
  217. static int luaB_ipairs (lua_State *L) {
  218. #if defined(LUA_COMPAT_IPAIRS)
  219. return pairsmeta(L, "__ipairs", 1, ipairsaux);
  220. #else
  221. luaL_checkany(L, 1);
  222. lua_pushcfunction(L, ipairsaux); /* iteration function */
  223. lua_pushvalue(L, 1); /* state */
  224. lua_pushinteger(L, 0); /* initial value */
  225. return 3;
  226. #endif
  227. }
  228. static int load_aux (lua_State *L, int status, int envidx) {
  229. if (status == LUA_OK) {
  230. if (envidx != 0) { /* 'env' parameter? */
  231. lua_pushvalue(L, envidx); /* environment for loaded function */
  232. if (!lua_setupvalue(L, -2, 1)) /* set it as 1st upvalue */
  233. lua_pop(L, 1); /* remove 'env' if not used by previous call */
  234. }
  235. return 1;
  236. }
  237. else { /* error (message is on top of the stack) */
  238. lua_pushnil(L);
  239. lua_insert(L, -2); /* put before error message */
  240. return 2; /* return nil plus error message */
  241. }
  242. }
  243. static int luaB_loadfile (lua_State *L) {
  244. const char *fname = luaL_optstring(L, 1, NULL);
  245. const char *mode = luaL_optstring(L, 2, NULL);
  246. int env = (!lua_isnone(L, 3) ? 3 : 0); /* 'env' index or 0 if no 'env' */
  247. int status = luaL_loadfilex(L, fname, mode);
  248. return load_aux(L, status, env);
  249. }
  250. /*
  251. ** {======================================================
  252. ** Generic Read function
  253. ** =======================================================
  254. */
  255. /*
  256. ** reserved slot, above all arguments, to hold a copy of the returned
  257. ** string to avoid it being collected while parsed. 'load' has four
  258. ** optional arguments (chunk, source name, mode, and environment).
  259. */
  260. #define RESERVEDSLOT 5
  261. /*
  262. ** Reader for generic 'load' function: 'lua_load' uses the
  263. ** stack for internal stuff, so the reader cannot change the
  264. ** stack top. Instead, it keeps its resulting string in a
  265. ** reserved slot inside the stack.
  266. */
  267. static const char *generic_reader (lua_State *L, void *ud, size_t *size) {
  268. (void)(ud); /* not used */
  269. luaL_checkstack(L, 2, "too many nested functions");
  270. lua_pushvalue(L, 1); /* get function */
  271. lua_call(L, 0, 1); /* call it */
  272. if (lua_isnil(L, -1)) {
  273. lua_pop(L, 1); /* pop result */
  274. *size = 0;
  275. return NULL;
  276. }
  277. else if (!lua_isstring(L, -1))
  278. luaL_error(L, "reader function must return a string");
  279. lua_replace(L, RESERVEDSLOT); /* save string in reserved slot */
  280. return lua_tolstring(L, RESERVEDSLOT, size);
  281. }
  282. static int luaB_load (lua_State *L) {
  283. int status;
  284. size_t l;
  285. const char *s = lua_tolstring(L, 1, &l);
  286. const char *mode = luaL_optstring(L, 3, "bt");
  287. int env = (!lua_isnone(L, 4) ? 4 : 0); /* 'env' index or 0 if no 'env' */
  288. if (s != NULL) { /* loading a string? */
  289. const char *chunkname = luaL_optstring(L, 2, s);
  290. status = luaL_loadbufferx(L, s, l, chunkname, mode);
  291. }
  292. else { /* loading from a reader function */
  293. const char *chunkname = luaL_optstring(L, 2, "=(load)");
  294. luaL_checktype(L, 1, LUA_TFUNCTION);
  295. lua_settop(L, RESERVEDSLOT); /* create reserved slot */
  296. status = lua_load(L, generic_reader, NULL, chunkname, mode);
  297. }
  298. return load_aux(L, status, env);
  299. }
  300. /* }====================================================== */
  301. static int dofilecont (lua_State *L, int d1, lua_KContext d2) {
  302. (void)d1; (void)d2; /* only to match 'lua_Kfunction' prototype */
  303. return lua_gettop(L) - 1;
  304. }
  305. static int luaB_dofile (lua_State *L) {
  306. const char *fname = luaL_optstring(L, 1, NULL);
  307. lua_settop(L, 1);
  308. if (luaL_loadfile(L, fname) != LUA_OK)
  309. return lua_error(L);
  310. lua_callk(L, 0, LUA_MULTRET, 0, dofilecont);
  311. return dofilecont(L, 0, 0);
  312. }
  313. static int luaB_assert (lua_State *L) {
  314. if (lua_toboolean(L, 1)) /* condition is true? */
  315. return lua_gettop(L); /* return all arguments */
  316. else { /* error */
  317. luaL_checkany(L, 1); /* there must be a condition */
  318. lua_remove(L, 1); /* remove it */
  319. lua_pushliteral(L, "assertion failed!"); /* default message */
  320. lua_settop(L, 1); /* leave only message (default if no other one) */
  321. return luaB_error(L); /* call 'error' */
  322. }
  323. }
  324. static int luaB_select (lua_State *L) {
  325. int n = lua_gettop(L);
  326. if (lua_type(L, 1) == LUA_TSTRING && *lua_tostring(L, 1) == '#') {
  327. lua_pushinteger(L, n-1);
  328. return 1;
  329. }
  330. else {
  331. lua_Integer i = luaL_checkinteger(L, 1);
  332. if (i < 0) i = n + i;
  333. else if (i > n) i = n;
  334. luaL_argcheck(L, 1 <= i, 1, "index out of range");
  335. return n - (int)i;
  336. }
  337. }
  338. /*
  339. ** Continuation function for 'pcall' and 'xpcall'. Both functions
  340. ** already pushed a 'true' before doing the call, so in case of success
  341. ** 'finishpcall' only has to return everything in the stack minus
  342. ** 'extra' values (where 'extra' is exactly the number of items to be
  343. ** ignored).
  344. */
  345. static int finishpcall (lua_State *L, int status, lua_KContext extra) {
  346. if (status != LUA_OK && status != LUA_YIELD) { /* error? */
  347. lua_pushboolean(L, 0); /* first result (false) */
  348. lua_pushvalue(L, -2); /* error message */
  349. return 2; /* return false, msg */
  350. }
  351. else
  352. return lua_gettop(L) - (int)extra; /* return all results */
  353. }
  354. static int luaB_pcall (lua_State *L) {
  355. int status;
  356. luaL_checkany(L, 1);
  357. lua_pushboolean(L, 1); /* first result if no errors */
  358. lua_insert(L, 1); /* put it in place */
  359. status = lua_pcallk(L, lua_gettop(L) - 2, LUA_MULTRET, 0, 0, finishpcall);
  360. return finishpcall(L, status, 0);
  361. }
  362. /*
  363. ** Do a protected call with error handling. After 'lua_rotate', the
  364. ** stack will have <f, err, true, f, [args...]>; so, the function passes
  365. ** 2 to 'finishpcall' to skip the 2 first values when returning results.
  366. */
  367. static int luaB_xpcall (lua_State *L) {
  368. int status;
  369. int n = lua_gettop(L);
  370. luaL_checktype(L, 2, LUA_TFUNCTION); /* check error function */
  371. lua_pushboolean(L, 1); /* first result */
  372. lua_pushvalue(L, 1); /* function */
  373. lua_rotate(L, 3, 2); /* move them below function's arguments */
  374. status = lua_pcallk(L, n - 2, LUA_MULTRET, 2, 2, finishpcall);
  375. return finishpcall(L, status, 2);
  376. }
  377. static int luaB_tostring (lua_State *L) {
  378. luaL_checkany(L, 1);
  379. luaL_tolstring(L, 1, NULL);
  380. return 1;
  381. }
  382. static const luaL_Reg base_funcs[] = {
  383. {"assert", luaB_assert},
  384. {"collectgarbage", luaB_collectgarbage},
  385. {"dofile", luaB_dofile},
  386. {"error", luaB_error},
  387. {"getmetatable", luaB_getmetatable},
  388. {"ipairs", luaB_ipairs},
  389. {"loadfile", luaB_loadfile},
  390. {"load", luaB_load},
  391. #if defined(LUA_COMPAT_LOADSTRING)
  392. {"loadstring", luaB_load},
  393. #endif
  394. {"next", luaB_next},
  395. {"pairs", luaB_pairs},
  396. {"pcall", luaB_pcall},
  397. {"print", luaB_print},
  398. {"rawequal", luaB_rawequal},
  399. {"rawlen", luaB_rawlen},
  400. {"rawget", luaB_rawget},
  401. {"rawset", luaB_rawset},
  402. {"select", luaB_select},
  403. {"setmetatable", luaB_setmetatable},
  404. {"tonumber", luaB_tonumber},
  405. {"tostring", luaB_tostring},
  406. {"type", luaB_type},
  407. {"xpcall", luaB_xpcall},
  408. /* placeholders */
  409. {"_G", NULL},
  410. {"_VERSION", NULL},
  411. {NULL, NULL}
  412. };
  413. LUAMOD_API int luaopen_base (lua_State *L) {
  414. /* open lib into global table */
  415. lua_pushglobaltable(L);
  416. luaL_setfuncs(L, base_funcs, 0);
  417. /* set global _G */
  418. lua_pushvalue(L, -1);
  419. lua_setfield(L, -2, "_G");
  420. /* set global _VERSION */
  421. lua_pushliteral(L, LUA_VERSION);
  422. lua_setfield(L, -2, "_VERSION");
  423. return 1;
  424. }