1 | /* |
2 | ** $Id: lua.c $ |
3 | ** Lua stand-alone interpreter |
4 | ** See Copyright Notice in lua.h |
5 | */ |
6 | |
7 | #define lua_c |
8 | |
9 | #include "lprefix.h" |
10 | |
11 | |
12 | #include <stdio.h> |
13 | #include <stdlib.h> |
14 | #include <string.h> |
15 | |
16 | #include <signal.h> |
17 | |
18 | #include "lua.h" |
19 | |
20 | #include "lauxlib.h" |
21 | #include "lualib.h" |
22 | |
23 | |
24 | #if !defined(LUA_PROGNAME) |
25 | #define LUA_PROGNAME "lua" |
26 | #endif |
27 | |
28 | #if !defined(LUA_INIT_VAR) |
29 | #define LUA_INIT_VAR "LUA_INIT" |
30 | #endif |
31 | |
32 | #define LUA_INITVARVERSION LUA_INIT_VAR LUA_VERSUFFIX |
33 | |
34 | |
35 | static lua_State *globalL = NULL; |
36 | |
37 | static const char *progname = LUA_PROGNAME; |
38 | |
39 | |
40 | #if defined(LUA_USE_POSIX) /* { */ |
41 | |
42 | /* |
43 | ** Use 'sigaction' when available. |
44 | */ |
45 | static void setsignal (int sig, void (*handler)(int)) { |
46 | struct sigaction sa; |
47 | sa.sa_handler = handler; |
48 | sa.sa_flags = 0; |
49 | sigemptyset(&sa.sa_mask); /* do not mask any signal */ |
50 | sigaction(sig, &sa, NULL); |
51 | } |
52 | |
53 | #else /* }{ */ |
54 | |
55 | #define setsignal signal |
56 | |
57 | #endif /* } */ |
58 | |
59 | |
60 | /* |
61 | ** Hook set by signal function to stop the interpreter. |
62 | */ |
63 | static void lstop (lua_State *L, lua_Debug *ar) { |
64 | (void)ar; /* unused arg. */ |
65 | lua_sethook(L, NULL, 0, 0); /* reset hook */ |
66 | luaL_error(L, "interrupted!" ); |
67 | } |
68 | |
69 | |
70 | /* |
71 | ** Function to be called at a C signal. Because a C signal cannot |
72 | ** just change a Lua state (as there is no proper synchronization), |
73 | ** this function only sets a hook that, when called, will stop the |
74 | ** interpreter. |
75 | */ |
76 | static void laction (int i) { |
77 | int flag = LUA_MASKCALL | LUA_MASKRET | LUA_MASKLINE | LUA_MASKCOUNT; |
78 | setsignal(i, SIG_DFL); /* if another SIGINT happens, terminate process */ |
79 | lua_sethook(globalL, lstop, flag, 1); |
80 | } |
81 | |
82 | |
83 | static void print_usage (const char *badoption) { |
84 | lua_writestringerror("%s: " , progname); |
85 | if (badoption[1] == 'e' || badoption[1] == 'l') |
86 | lua_writestringerror("'%s' needs argument\n" , badoption); |
87 | else |
88 | lua_writestringerror("unrecognized option '%s'\n" , badoption); |
89 | lua_writestringerror( |
90 | "usage: %s [options] [script [args]]\n" |
91 | "Available options are:\n" |
92 | " -e stat execute string 'stat'\n" |
93 | " -i enter interactive mode after executing 'script'\n" |
94 | " -l mod require library 'mod' into global 'mod'\n" |
95 | " -l g=mod require library 'mod' into global 'g'\n" |
96 | " -v show version information\n" |
97 | " -E ignore environment variables\n" |
98 | " -W turn warnings on\n" |
99 | " -- stop handling options\n" |
100 | " - stop handling options and execute stdin\n" |
101 | , |
102 | progname); |
103 | } |
104 | |
105 | |
106 | /* |
107 | ** Prints an error message, adding the program name in front of it |
108 | ** (if present) |
109 | */ |
110 | static void l_message (const char *pname, const char *msg) { |
111 | if (pname) lua_writestringerror("%s: " , pname); |
112 | lua_writestringerror("%s\n" , msg); |
113 | } |
114 | |
115 | |
116 | /* |
117 | ** Check whether 'status' is not OK and, if so, prints the error |
118 | ** message on the top of the stack. It assumes that the error object |
119 | ** is a string, as it was either generated by Lua or by 'msghandler'. |
120 | */ |
121 | static int report (lua_State *L, int status) { |
122 | if (status != LUA_OK) { |
123 | const char *msg = lua_tostring(L, -1); |
124 | l_message(progname, msg); |
125 | lua_pop(L, 1); /* remove message */ |
126 | } |
127 | return status; |
128 | } |
129 | |
130 | |
131 | /* |
132 | ** Message handler used to run all chunks |
133 | */ |
134 | static int msghandler (lua_State *L) { |
135 | const char *msg = lua_tostring(L, 1); |
136 | if (msg == NULL) { /* is error object not a string? */ |
137 | if (luaL_callmeta(L, 1, "__tostring" ) && /* does it have a metamethod */ |
138 | lua_type(L, -1) == LUA_TSTRING) /* that produces a string? */ |
139 | return 1; /* that is the message */ |
140 | else |
141 | msg = lua_pushfstring(L, "(error object is a %s value)" , |
142 | luaL_typename(L, 1)); |
143 | } |
144 | luaL_traceback(L, L, msg, 1); /* append a standard traceback */ |
145 | return 1; /* return the traceback */ |
146 | } |
147 | |
148 | |
149 | /* |
150 | ** Interface to 'lua_pcall', which sets appropriate message function |
151 | ** and C-signal handler. Used to run all chunks. |
152 | */ |
153 | static int docall (lua_State *L, int narg, int nres) { |
154 | int status; |
155 | int base = lua_gettop(L) - narg; /* function index */ |
156 | lua_pushcfunction(L, msghandler); /* push message handler */ |
157 | lua_insert(L, base); /* put it under function and args */ |
158 | globalL = L; /* to be available to 'laction' */ |
159 | setsignal(SIGINT, laction); /* set C-signal handler */ |
160 | status = lua_pcall(L, narg, nres, base); |
161 | setsignal(SIGINT, SIG_DFL); /* reset C-signal handler */ |
162 | lua_remove(L, base); /* remove message handler from the stack */ |
163 | return status; |
164 | } |
165 | |
166 | |
167 | static void print_version (void) { |
168 | lua_writestring(LUA_COPYRIGHT, strlen(LUA_COPYRIGHT)); |
169 | lua_writeline(); |
170 | } |
171 | |
172 | |
173 | /* |
174 | ** Create the 'arg' table, which stores all arguments from the |
175 | ** command line ('argv'). It should be aligned so that, at index 0, |
176 | ** it has 'argv[script]', which is the script name. The arguments |
177 | ** to the script (everything after 'script') go to positive indices; |
178 | ** other arguments (before the script name) go to negative indices. |
179 | ** If there is no script name, assume interpreter's name as base. |
180 | */ |
181 | static void createargtable (lua_State *L, char **argv, int argc, int script) { |
182 | int i, narg; |
183 | if (script == argc) script = 0; /* no script name? */ |
184 | narg = argc - (script + 1); /* number of positive indices */ |
185 | lua_createtable(L, narg, script + 1); |
186 | for (i = 0; i < argc; i++) { |
187 | lua_pushstring(L, argv[i]); |
188 | lua_rawseti(L, -2, i - script); |
189 | } |
190 | lua_setglobal(L, "arg" ); |
191 | } |
192 | |
193 | |
194 | static int dochunk (lua_State *L, int status) { |
195 | if (status == LUA_OK) status = docall(L, 0, 0); |
196 | return report(L, status); |
197 | } |
198 | |
199 | |
200 | static int dofile (lua_State *L, const char *name) { |
201 | return dochunk(L, luaL_loadfile(L, name)); |
202 | } |
203 | |
204 | |
205 | static int dostring (lua_State *L, const char *s, const char *name) { |
206 | return dochunk(L, luaL_loadbuffer(L, s, strlen(s), name)); |
207 | } |
208 | |
209 | |
210 | /* |
211 | ** Receives 'globname[=modname]' and runs 'globname = require(modname)'. |
212 | */ |
213 | static int dolibrary (lua_State *L, char *globname) { |
214 | int status; |
215 | char *modname = strchr(globname, '='); |
216 | if (modname == NULL) /* no explicit name? */ |
217 | modname = globname; /* module name is equal to global name */ |
218 | else { |
219 | *modname = '\0'; /* global name ends here */ |
220 | modname++; /* module name starts after the '=' */ |
221 | } |
222 | lua_getglobal(L, "require" ); |
223 | lua_pushstring(L, modname); |
224 | status = docall(L, 1, 1); /* call 'require(modname)' */ |
225 | if (status == LUA_OK) |
226 | lua_setglobal(L, globname); /* globname = require(modname) */ |
227 | return report(L, status); |
228 | } |
229 | |
230 | |
231 | /* |
232 | ** Push on the stack the contents of table 'arg' from 1 to #arg |
233 | */ |
234 | static int pushargs (lua_State *L) { |
235 | int i, n; |
236 | if (lua_getglobal(L, "arg" ) != LUA_TTABLE) |
237 | luaL_error(L, "'arg' is not a table" ); |
238 | n = (int)luaL_len(L, -1); |
239 | luaL_checkstack(L, n + 3, "too many arguments to script" ); |
240 | for (i = 1; i <= n; i++) |
241 | lua_rawgeti(L, -i, i); |
242 | lua_remove(L, -i); /* remove table from the stack */ |
243 | return n; |
244 | } |
245 | |
246 | |
247 | static int handle_script (lua_State *L, char **argv) { |
248 | int status; |
249 | const char *fname = argv[0]; |
250 | if (strcmp(fname, "-" ) == 0 && strcmp(argv[-1], "--" ) != 0) |
251 | fname = NULL; /* stdin */ |
252 | status = luaL_loadfile(L, fname); |
253 | if (status == LUA_OK) { |
254 | int n = pushargs(L); /* push arguments to script */ |
255 | status = docall(L, n, LUA_MULTRET); |
256 | } |
257 | return report(L, status); |
258 | } |
259 | |
260 | |
261 | /* bits of various argument indicators in 'args' */ |
262 | #define has_error 1 /* bad option */ |
263 | #define has_i 2 /* -i */ |
264 | #define has_v 4 /* -v */ |
265 | #define has_e 8 /* -e */ |
266 | #define has_E 16 /* -E */ |
267 | |
268 | |
269 | /* |
270 | ** Traverses all arguments from 'argv', returning a mask with those |
271 | ** needed before running any Lua code (or an error code if it finds |
272 | ** any invalid argument). 'first' returns the first not-handled argument |
273 | ** (either the script name or a bad argument in case of error). |
274 | */ |
275 | static int collectargs (char **argv, int *first) { |
276 | int args = 0; |
277 | int i; |
278 | for (i = 1; argv[i] != NULL; i++) { |
279 | *first = i; |
280 | if (argv[i][0] != '-') /* not an option? */ |
281 | return args; /* stop handling options */ |
282 | switch (argv[i][1]) { /* else check option */ |
283 | case '-': /* '--' */ |
284 | if (argv[i][2] != '\0') /* extra characters after '--'? */ |
285 | return has_error; /* invalid option */ |
286 | *first = i + 1; |
287 | return args; |
288 | case '\0': /* '-' */ |
289 | return args; /* script "name" is '-' */ |
290 | case 'E': |
291 | if (argv[i][2] != '\0') /* extra characters? */ |
292 | return has_error; /* invalid option */ |
293 | args |= has_E; |
294 | break; |
295 | case 'W': |
296 | if (argv[i][2] != '\0') /* extra characters? */ |
297 | return has_error; /* invalid option */ |
298 | break; |
299 | case 'i': |
300 | args |= has_i; /* (-i implies -v) *//* FALLTHROUGH */ |
301 | case 'v': |
302 | if (argv[i][2] != '\0') /* extra characters? */ |
303 | return has_error; /* invalid option */ |
304 | args |= has_v; |
305 | break; |
306 | case 'e': |
307 | args |= has_e; /* FALLTHROUGH */ |
308 | case 'l': /* both options need an argument */ |
309 | if (argv[i][2] == '\0') { /* no concatenated argument? */ |
310 | i++; /* try next 'argv' */ |
311 | if (argv[i] == NULL || argv[i][0] == '-') |
312 | return has_error; /* no next argument or it is another option */ |
313 | } |
314 | break; |
315 | default: /* invalid option */ |
316 | return has_error; |
317 | } |
318 | } |
319 | *first = i; /* no script name */ |
320 | return args; |
321 | } |
322 | |
323 | |
324 | /* |
325 | ** Processes options 'e' and 'l', which involve running Lua code, and |
326 | ** 'W', which also affects the state. |
327 | ** Returns 0 if some code raises an error. |
328 | */ |
329 | static int runargs (lua_State *L, char **argv, int n) { |
330 | int i; |
331 | for (i = 1; i < n; i++) { |
332 | int option = argv[i][1]; |
333 | lua_assert(argv[i][0] == '-'); /* already checked */ |
334 | switch (option) { |
335 | case 'e': case 'l': { |
336 | int status; |
337 | char * = argv[i] + 2; /* both options need an argument */ |
338 | if (*extra == '\0') extra = argv[++i]; |
339 | lua_assert(extra != NULL); |
340 | status = (option == 'e') |
341 | ? dostring(L, extra, "=(command line)" ) |
342 | : dolibrary(L, extra); |
343 | if (status != LUA_OK) return 0; |
344 | break; |
345 | } |
346 | case 'W': |
347 | lua_warning(L, "@on" , 0); /* warnings on */ |
348 | break; |
349 | } |
350 | } |
351 | return 1; |
352 | } |
353 | |
354 | |
355 | static int handle_luainit (lua_State *L) { |
356 | const char *name = "=" LUA_INITVARVERSION; |
357 | const char *init = getenv(name + 1); |
358 | if (init == NULL) { |
359 | name = "=" LUA_INIT_VAR; |
360 | init = getenv(name + 1); /* try alternative name */ |
361 | } |
362 | if (init == NULL) return LUA_OK; |
363 | else if (init[0] == '@') |
364 | return dofile(L, init+1); |
365 | else |
366 | return dostring(L, init, name); |
367 | } |
368 | |
369 | |
370 | /* |
371 | ** {================================================================== |
372 | ** Read-Eval-Print Loop (REPL) |
373 | ** =================================================================== |
374 | */ |
375 | |
376 | #if !defined(LUA_PROMPT) |
377 | #define LUA_PROMPT "> " |
378 | #define LUA_PROMPT2 ">> " |
379 | #endif |
380 | |
381 | #if !defined(LUA_MAXINPUT) |
382 | #define LUA_MAXINPUT 512 |
383 | #endif |
384 | |
385 | |
386 | /* |
387 | ** lua_stdin_is_tty detects whether the standard input is a 'tty' (that |
388 | ** is, whether we're running lua interactively). |
389 | */ |
390 | #if !defined(lua_stdin_is_tty) /* { */ |
391 | |
392 | #if defined(LUA_USE_POSIX) /* { */ |
393 | |
394 | #include <unistd.h> |
395 | #define lua_stdin_is_tty() isatty(0) |
396 | |
397 | #elif defined(LUA_USE_WINDOWS) /* }{ */ |
398 | |
399 | #include <io.h> |
400 | #include <windows.h> |
401 | |
402 | #define lua_stdin_is_tty() _isatty(_fileno(stdin)) |
403 | |
404 | #else /* }{ */ |
405 | |
406 | /* ISO C definition */ |
407 | #define lua_stdin_is_tty() 1 /* assume stdin is a tty */ |
408 | |
409 | #endif /* } */ |
410 | |
411 | #endif /* } */ |
412 | |
413 | |
414 | /* |
415 | ** lua_readline defines how to show a prompt and then read a line from |
416 | ** the standard input. |
417 | ** lua_saveline defines how to "save" a read line in a "history". |
418 | ** lua_freeline defines how to free a line read by lua_readline. |
419 | */ |
420 | #if !defined(lua_readline) /* { */ |
421 | |
422 | #if defined(LUA_USE_READLINE) /* { */ |
423 | |
424 | #include <readline/readline.h> |
425 | #include <readline/history.h> |
426 | #define lua_initreadline(L) ((void)L, rl_readline_name="lua") |
427 | #define lua_readline(L,b,p) ((void)L, ((b)=readline(p)) != NULL) |
428 | #define lua_saveline(L,line) ((void)L, add_history(line)) |
429 | #define lua_freeline(L,b) ((void)L, free(b)) |
430 | |
431 | #else /* }{ */ |
432 | |
433 | #define lua_initreadline(L) ((void)L) |
434 | #define lua_readline(L,b,p) \ |
435 | ((void)L, fputs(p, stdout), fflush(stdout), /* show prompt */ \ |
436 | fgets(b, LUA_MAXINPUT, stdin) != NULL) /* get line */ |
437 | #define lua_saveline(L,line) { (void)L; (void)line; } |
438 | #define lua_freeline(L,b) { (void)L; (void)b; } |
439 | |
440 | #endif /* } */ |
441 | |
442 | #endif /* } */ |
443 | |
444 | |
445 | /* |
446 | ** Return the string to be used as a prompt by the interpreter. Leave |
447 | ** the string (or nil, if using the default value) on the stack, to keep |
448 | ** it anchored. |
449 | */ |
450 | static const char *get_prompt (lua_State *L, int firstline) { |
451 | if (lua_getglobal(L, firstline ? "_PROMPT" : "_PROMPT2" ) == LUA_TNIL) |
452 | return (firstline ? LUA_PROMPT : LUA_PROMPT2); /* use the default */ |
453 | else { /* apply 'tostring' over the value */ |
454 | const char *p = luaL_tolstring(L, -1, NULL); |
455 | lua_remove(L, -2); /* remove original value */ |
456 | return p; |
457 | } |
458 | } |
459 | |
460 | /* mark in error messages for incomplete statements */ |
461 | #define EOFMARK "<eof>" |
462 | #define marklen (sizeof(EOFMARK)/sizeof(char) - 1) |
463 | |
464 | |
465 | /* |
466 | ** Check whether 'status' signals a syntax error and the error |
467 | ** message at the top of the stack ends with the above mark for |
468 | ** incomplete statements. |
469 | */ |
470 | static int incomplete (lua_State *L, int status) { |
471 | if (status == LUA_ERRSYNTAX) { |
472 | size_t lmsg; |
473 | const char *msg = lua_tolstring(L, -1, &lmsg); |
474 | if (lmsg >= marklen && strcmp(msg + lmsg - marklen, EOFMARK) == 0) { |
475 | lua_pop(L, 1); |
476 | return 1; |
477 | } |
478 | } |
479 | return 0; /* else... */ |
480 | } |
481 | |
482 | |
483 | /* |
484 | ** Prompt the user, read a line, and push it into the Lua stack. |
485 | */ |
486 | static int pushline (lua_State *L, int firstline) { |
487 | char buffer[LUA_MAXINPUT]; |
488 | char *b = buffer; |
489 | size_t l; |
490 | const char *prmt = get_prompt(L, firstline); |
491 | int readstatus = lua_readline(L, b, prmt); |
492 | if (readstatus == 0) |
493 | return 0; /* no input (prompt will be popped by caller) */ |
494 | lua_pop(L, 1); /* remove prompt */ |
495 | l = strlen(b); |
496 | if (l > 0 && b[l-1] == '\n') /* line ends with newline? */ |
497 | b[--l] = '\0'; /* remove it */ |
498 | if (firstline && b[0] == '=') /* for compatibility with 5.2, ... */ |
499 | lua_pushfstring(L, "return %s" , b + 1); /* change '=' to 'return' */ |
500 | else |
501 | lua_pushlstring(L, b, l); |
502 | lua_freeline(L, b); |
503 | return 1; |
504 | } |
505 | |
506 | |
507 | /* |
508 | ** Try to compile line on the stack as 'return <line>;'; on return, stack |
509 | ** has either compiled chunk or original line (if compilation failed). |
510 | */ |
511 | static int addreturn (lua_State *L) { |
512 | const char *line = lua_tostring(L, -1); /* original line */ |
513 | const char *retline = lua_pushfstring(L, "return %s;" , line); |
514 | int status = luaL_loadbuffer(L, retline, strlen(retline), "=stdin" ); |
515 | if (status == LUA_OK) { |
516 | lua_remove(L, -2); /* remove modified line */ |
517 | if (line[0] != '\0') /* non empty? */ |
518 | lua_saveline(L, line); /* keep history */ |
519 | } |
520 | else |
521 | lua_pop(L, 2); /* pop result from 'luaL_loadbuffer' and modified line */ |
522 | return status; |
523 | } |
524 | |
525 | |
526 | /* |
527 | ** Read multiple lines until a complete Lua statement |
528 | */ |
529 | static int multiline (lua_State *L) { |
530 | for (;;) { /* repeat until gets a complete statement */ |
531 | size_t len; |
532 | const char *line = lua_tolstring(L, 1, &len); /* get what it has */ |
533 | int status = luaL_loadbuffer(L, line, len, "=stdin" ); /* try it */ |
534 | if (!incomplete(L, status) || !pushline(L, 0)) { |
535 | lua_saveline(L, line); /* keep history */ |
536 | return status; /* cannot or should not try to add continuation line */ |
537 | } |
538 | lua_pushliteral(L, "\n" ); /* add newline... */ |
539 | lua_insert(L, -2); /* ...between the two lines */ |
540 | lua_concat(L, 3); /* join them */ |
541 | } |
542 | } |
543 | |
544 | |
545 | /* |
546 | ** Read a line and try to load (compile) it first as an expression (by |
547 | ** adding "return " in front of it) and second as a statement. Return |
548 | ** the final status of load/call with the resulting function (if any) |
549 | ** in the top of the stack. |
550 | */ |
551 | static int loadline (lua_State *L) { |
552 | int status; |
553 | lua_settop(L, 0); |
554 | if (!pushline(L, 1)) |
555 | return -1; /* no input */ |
556 | if ((status = addreturn(L)) != LUA_OK) /* 'return ...' did not work? */ |
557 | status = multiline(L); /* try as command, maybe with continuation lines */ |
558 | lua_remove(L, 1); /* remove line from the stack */ |
559 | lua_assert(lua_gettop(L) == 1); |
560 | return status; |
561 | } |
562 | |
563 | |
564 | /* |
565 | ** Prints (calling the Lua 'print' function) any values on the stack |
566 | */ |
567 | static void l_print (lua_State *L) { |
568 | int n = lua_gettop(L); |
569 | if (n > 0) { /* any result to be printed? */ |
570 | luaL_checkstack(L, LUA_MINSTACK, "too many results to print" ); |
571 | lua_getglobal(L, "print" ); |
572 | lua_insert(L, 1); |
573 | if (lua_pcall(L, n, 0, 0) != LUA_OK) |
574 | l_message(progname, lua_pushfstring(L, "error calling 'print' (%s)" , |
575 | lua_tostring(L, -1))); |
576 | } |
577 | } |
578 | |
579 | |
580 | /* |
581 | ** Do the REPL: repeatedly read (load) a line, evaluate (call) it, and |
582 | ** print any results. |
583 | */ |
584 | static void doREPL (lua_State *L) { |
585 | int status; |
586 | const char *oldprogname = progname; |
587 | progname = NULL; /* no 'progname' on errors in interactive mode */ |
588 | lua_initreadline(L); |
589 | while ((status = loadline(L)) != -1) { |
590 | if (status == LUA_OK) |
591 | status = docall(L, 0, LUA_MULTRET); |
592 | if (status == LUA_OK) l_print(L); |
593 | else report(L, status); |
594 | } |
595 | lua_settop(L, 0); /* clear stack */ |
596 | lua_writeline(); |
597 | progname = oldprogname; |
598 | } |
599 | |
600 | /* }================================================================== */ |
601 | |
602 | |
603 | /* |
604 | ** Main body of stand-alone interpreter (to be called in protected mode). |
605 | ** Reads the options and handles them all. |
606 | */ |
607 | static int pmain (lua_State *L) { |
608 | int argc = (int)lua_tointeger(L, 1); |
609 | char **argv = (char **)lua_touserdata(L, 2); |
610 | int script; |
611 | int args = collectargs(argv, &script); |
612 | luaL_checkversion(L); /* check that interpreter has correct version */ |
613 | if (argv[0] && argv[0][0]) progname = argv[0]; |
614 | if (args == has_error) { /* bad arg? */ |
615 | print_usage(argv[script]); /* 'script' has index of bad arg. */ |
616 | return 0; |
617 | } |
618 | if (args & has_v) /* option '-v'? */ |
619 | print_version(); |
620 | if (args & has_E) { /* option '-E'? */ |
621 | lua_pushboolean(L, 1); /* signal for libraries to ignore env. vars. */ |
622 | lua_setfield(L, LUA_REGISTRYINDEX, "LUA_NOENV" ); |
623 | } |
624 | luaL_openlibs(L); /* open standard libraries */ |
625 | createargtable(L, argv, argc, script); /* create table 'arg' */ |
626 | lua_gc(L, LUA_GCGEN, 0, 0); /* GC in generational mode */ |
627 | if (!(args & has_E)) { /* no option '-E'? */ |
628 | if (handle_luainit(L) != LUA_OK) /* run LUA_INIT */ |
629 | return 0; /* error running LUA_INIT */ |
630 | } |
631 | if (!runargs(L, argv, script)) /* execute arguments -e and -l */ |
632 | return 0; /* something failed */ |
633 | if (script < argc && /* execute main script (if there is one) */ |
634 | handle_script(L, argv + script) != LUA_OK) |
635 | return 0; |
636 | if (args & has_i) /* -i option? */ |
637 | doREPL(L); /* do read-eval-print loop */ |
638 | else if (script == argc && !(args & (has_e | has_v))) { /* no arguments? */ |
639 | if (lua_stdin_is_tty()) { /* running in interactive mode? */ |
640 | print_version(); |
641 | doREPL(L); /* do read-eval-print loop */ |
642 | } |
643 | else dofile(L, NULL); /* executes stdin as a file */ |
644 | } |
645 | lua_pushboolean(L, 1); /* signal no errors */ |
646 | return 1; |
647 | } |
648 | |
649 | |
650 | int main (int argc, char **argv) { |
651 | int status, result; |
652 | lua_State *L = luaL_newstate(); /* create state */ |
653 | if (L == NULL) { |
654 | l_message(argv[0], "cannot create state: not enough memory" ); |
655 | return EXIT_FAILURE; |
656 | } |
657 | lua_pushcfunction(L, &pmain); /* to call 'pmain' in protected mode */ |
658 | lua_pushinteger(L, argc); /* 1st argument */ |
659 | lua_pushlightuserdata(L, argv); /* 2nd argument */ |
660 | status = lua_pcall(L, 2, 1, 0); /* do the call */ |
661 | result = lua_toboolean(L, -1); /* get result */ |
662 | report(L, status); |
663 | lua_close(L); |
664 | return (result && status == LUA_OK) ? EXIT_SUCCESS : EXIT_FAILURE; |
665 | } |
666 | |
667 | |