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