@@ -0,0 +1,497 @@
1+/*
2+** $Id: lua.c,v 1.206.1.1 2013/04/12 18:48:47 roberto Exp $
3+** Lua stand-alone interpreter
4+** See Copyright Notice in lua.h
5+*/
6+
7+
8+#include <signal.h>
9+#include <stdio.h>
10+#include <stdlib.h>
11+#include <string.h>
12+
13+#define lua_c
14+
15+#include "lua.h"
16+
17+#include "lauxlib.h"
18+#include "lualib.h"
19+
20+
21+#if !defined(LUA_PROMPT)
22+#define LUA_PROMPT "> "
23+#define LUA_PROMPT2 ">> "
24+#endif
25+
26+#if !defined(LUA_PROGNAME)
27+#define LUA_PROGNAME "lua"
28+#endif
29+
30+#if !defined(LUA_MAXINPUT)
31+#define LUA_MAXINPUT 512
32+#endif
33+
34+#if !defined(LUA_INIT)
35+#define LUA_INIT "LUA_INIT"
36+#endif
37+
38+#define LUA_INITVERSION \
39+ LUA_INIT "_" LUA_VERSION_MAJOR "_" LUA_VERSION_MINOR
40+
41+
42+/*
43+** lua_stdin_is_tty detects whether the standard input is a 'tty' (that
44+** is, whether we're running lua interactively).
45+*/
46+#if defined(LUA_USE_ISATTY)
47+#include <unistd.h>
48+#define lua_stdin_is_tty() isatty(0)
49+#elif defined(LUA_WIN)
50+#include <io.h>
51+#include <stdio.h>
52+#define lua_stdin_is_tty() _isatty(_fileno(stdin))
53+#else
54+#define lua_stdin_is_tty() 1 /* assume stdin is a tty */
55+#endif
56+
57+
58+/*
59+** lua_readline defines how to show a prompt and then read a line from
60+** the standard input.
61+** lua_saveline defines how to "save" a read line in a "history".
62+** lua_freeline defines how to free a line read by lua_readline.
63+*/
64+#if defined(LUA_USE_READLINE)
65+
66+#include <stdio.h>
67+#include <readline/readline.h>
68+#include <readline/history.h>
69+#define lua_readline(L,b,p) ((void)L, ((b)=readline(p)) != NULL)
70+#define lua_saveline(L,idx) \
71+ if (lua_rawlen(L,idx) > 0) /* non-empty line? */ \
72+ add_history(lua_tostring(L, idx)); /* add it to history */
73+#define lua_freeline(L,b) ((void)L, free(b))
74+
75+#elif !defined(lua_readline)
76+
77+#define lua_readline(L,b,p) \
78+ ((void)L, fputs(p, stdout), fflush(stdout), /* show prompt */ \
79+ fgets(b, LUA_MAXINPUT, stdin) != NULL) /* get line */
80+#define lua_saveline(L,idx) { (void)L; (void)idx; }
81+#define lua_freeline(L,b) { (void)L; (void)b; }
82+
83+#endif
84+
85+
86+
87+
88+static lua_State *globalL = NULL;
89+
90+static const char *progname = LUA_PROGNAME;
91+
92+
93+
94+static void lstop (lua_State *L, lua_Debug *ar) {
95+ (void)ar; /* unused arg. */
96+ lua_sethook(L, NULL, 0, 0);
97+ luaL_error(L, "interrupted!");
98+}
99+
100+
101+static void laction (int i) {
102+ signal(i, SIG_DFL); /* if another SIGINT happens before lstop,
103+ terminate process (default action) */
104+ lua_sethook(globalL, lstop, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1);
105+}
106+
107+
108+static void print_usage (const char *badoption) {
109+ luai_writestringerror("%s: ", progname);
110+ if (badoption[1] == 'e' || badoption[1] == 'l')
111+ luai_writestringerror("'%s' needs argument\n", badoption);
112+ else
113+ luai_writestringerror("unrecognized option '%s'\n", badoption);
114+ luai_writestringerror(
115+ "usage: %s [options] [script [args]]\n"
116+ "Available options are:\n"
117+ " -e stat execute string " LUA_QL("stat") "\n"
118+ " -i enter interactive mode after executing " LUA_QL("script") "\n"
119+ " -l name require library " LUA_QL("name") "\n"
120+ " -v show version information\n"
121+ " -E ignore environment variables\n"
122+ " -- stop handling options\n"
123+ " - stop handling options and execute stdin\n"
124+ ,
125+ progname);
126+}
127+
128+
129+static void l_message (const char *pname, const char *msg) {
130+ if (pname) luai_writestringerror("%s: ", pname);
131+ luai_writestringerror("%s\n", msg);
132+}
133+
134+
135+static int report (lua_State *L, int status) {
136+ if (status != LUA_OK && !lua_isnil(L, -1)) {
137+ const char *msg = lua_tostring(L, -1);
138+ if (msg == NULL) msg = "(error object is not a string)";
139+ l_message(progname, msg);
140+ lua_pop(L, 1);
141+ /* force a complete garbage collection in case of errors */
142+ lua_gc(L, LUA_GCCOLLECT, 0);
143+ }
144+ return status;
145+}
146+
147+
148+/* the next function is called unprotected, so it must avoid errors */
149+static void finalreport (lua_State *L, int status) {
150+ if (status != LUA_OK) {
151+ const char *msg = (lua_type(L, -1) == LUA_TSTRING) ? lua_tostring(L, -1)
152+ : NULL;
153+ if (msg == NULL) msg = "(error object is not a string)";
154+ l_message(progname, msg);
155+ lua_pop(L, 1);
156+ }
157+}
158+
159+
160+static int traceback (lua_State *L) {
161+ const char *msg = lua_tostring(L, 1);
162+ if (msg)
163+ luaL_traceback(L, L, msg, 1);
164+ else if (!lua_isnoneornil(L, 1)) { /* is there an error object? */
165+ if (!luaL_callmeta(L, 1, "__tostring")) /* try its 'tostring' metamethod */
166+ lua_pushliteral(L, "(no error message)");
167+ }
168+ return 1;
169+}
170+
171+
172+static int docall (lua_State *L, int narg, int nres) {
173+ int status;
174+ int base = lua_gettop(L) - narg; /* function index */
175+ lua_pushcfunction(L, traceback); /* push traceback function */
176+ lua_insert(L, base); /* put it under chunk and args */
177+ globalL = L; /* to be available to 'laction' */
178+ signal(SIGINT, laction);
179+ status = lua_pcall(L, narg, nres, base);
180+ signal(SIGINT, SIG_DFL);
181+ lua_remove(L, base); /* remove traceback function */
182+ return status;
183+}
184+
185+
186+static void print_version (void) {
187+ luai_writestring(LUA_COPYRIGHT, strlen(LUA_COPYRIGHT));
188+ luai_writeline();
189+}
190+
191+
192+static int getargs (lua_State *L, char **argv, int n) {
193+ int narg;
194+ int i;
195+ int argc = 0;
196+ while (argv[argc]) argc++; /* count total number of arguments */
197+ narg = argc - (n + 1); /* number of arguments to the script */
198+ luaL_checkstack(L, narg + 3, "too many arguments to script");
199+ for (i=n+1; i < argc; i++)
200+ lua_pushstring(L, argv[i]);
201+ lua_createtable(L, narg, n + 1);
202+ for (i=0; i < argc; i++) {
203+ lua_pushstring(L, argv[i]);
204+ lua_rawseti(L, -2, i - n);
205+ }
206+ return narg;
207+}
208+
209+
210+static int dofile (lua_State *L, const char *name) {
211+ int status = luaL_loadfile(L, name);
212+ if (status == LUA_OK) status = docall(L, 0, 0);
213+ return report(L, status);
214+}
215+
216+
217+static int dostring (lua_State *L, const char *s, const char *name) {
218+ int status = luaL_loadbuffer(L, s, strlen(s), name);
219+ if (status == LUA_OK) status = docall(L, 0, 0);
220+ return report(L, status);
221+}
222+
223+
224+static int dolibrary (lua_State *L, const char *name) {
225+ int status;
226+ lua_getglobal(L, "require");
227+ lua_pushstring(L, name);
228+ status = docall(L, 1, 1); /* call 'require(name)' */
229+ if (status == LUA_OK)
230+ lua_setglobal(L, name); /* global[name] = require return */
231+ return report(L, status);
232+}
233+
234+
235+static const char *get_prompt (lua_State *L, int firstline) {
236+ const char *p;
237+ lua_getglobal(L, firstline ? "_PROMPT" : "_PROMPT2");
238+ p = lua_tostring(L, -1);
239+ if (p == NULL) p = (firstline ? LUA_PROMPT : LUA_PROMPT2);
240+ return p;
241+}
242+
243+/* mark in error messages for incomplete statements */
244+#define EOFMARK "<eof>"
245+#define marklen (sizeof(EOFMARK)/sizeof(char) - 1)
246+
247+static int incomplete (lua_State *L, int status) {
248+ if (status == LUA_ERRSYNTAX) {
249+ size_t lmsg;
250+ const char *msg = lua_tolstring(L, -1, &lmsg);
251+ if (lmsg >= marklen && strcmp(msg + lmsg - marklen, EOFMARK) == 0) {
252+ lua_pop(L, 1);
253+ return 1;
254+ }
255+ }
256+ return 0; /* else... */
257+}
258+
259+
260+static int pushline (lua_State *L, int firstline) {
261+ char buffer[LUA_MAXINPUT];
262+ char *b = buffer;
263+ size_t l;
264+ const char *prmt = get_prompt(L, firstline);
265+ int readstatus = lua_readline(L, b, prmt);
266+ lua_pop(L, 1); /* remove result from 'get_prompt' */
267+ if (readstatus == 0)
268+ return 0; /* no input */
269+ l = strlen(b);
270+ if (l > 0 && b[l-1] == '\n') /* line ends with newline? */
271+ b[l-1] = '\0'; /* remove it */
272+ if (firstline && b[0] == '=') /* first line starts with `=' ? */
273+ lua_pushfstring(L, "return %s", b+1); /* change it to `return' */
274+ else
275+ lua_pushstring(L, b);
276+ lua_freeline(L, b);
277+ return 1;
278+}
279+
280+
281+static int loadline (lua_State *L) {
282+ int status;
283+ lua_settop(L, 0);
284+ if (!pushline(L, 1))
285+ return -1; /* no input */
286+ for (;;) { /* repeat until gets a complete line */
287+ size_t l;
288+ const char *line = lua_tolstring(L, 1, &l);
289+ status = luaL_loadbuffer(L, line, l, "=stdin");
290+ if (!incomplete(L, status)) break; /* cannot try to add lines? */
291+ if (!pushline(L, 0)) /* no more input? */
292+ return -1;
293+ lua_pushliteral(L, "\n"); /* add a new line... */
294+ lua_insert(L, -2); /* ...between the two lines */
295+ lua_concat(L, 3); /* join them */
296+ }
297+ lua_saveline(L, 1);
298+ lua_remove(L, 1); /* remove line */
299+ return status;
300+}
301+
302+
303+void dotty (lua_State *L) {
304+ int status;
305+ const char *oldprogname = progname;
306+ progname = NULL;
307+ while ((status = loadline(L)) != -1) {
308+ if (status == LUA_OK) status = docall(L, 0, LUA_MULTRET);
309+ report(L, status);
310+ if (status == LUA_OK && lua_gettop(L) > 0) { /* any result to print? */
311+ luaL_checkstack(L, LUA_MINSTACK, "too many results to print");
312+ lua_getglobal(L, "print");
313+ lua_insert(L, 1);
314+ if (lua_pcall(L, lua_gettop(L)-1, 0, 0) != LUA_OK)
315+ l_message(progname, lua_pushfstring(L,
316+ "error calling " LUA_QL("print") " (%s)",
317+ lua_tostring(L, -1)));
318+ }
319+ }
320+ lua_settop(L, 0); /* clear stack */
321+ luai_writeline();
322+ progname = oldprogname;
323+}
324+
325+
326+static int handle_script (lua_State *L, char **argv, int n) {
327+ int status;
328+ const char *fname;
329+ int narg = getargs(L, argv, n); /* collect arguments */
330+ lua_setglobal(L, "arg");
331+ fname = argv[n];
332+ if (strcmp(fname, "-") == 0 && strcmp(argv[n-1], "--") != 0)
333+ fname = NULL; /* stdin */
334+ status = luaL_loadfile(L, fname);
335+ lua_insert(L, -(narg+1));
336+ if (status == LUA_OK)
337+ status = docall(L, narg, LUA_MULTRET);
338+ else
339+ lua_pop(L, narg);
340+ return report(L, status);
341+}
342+
343+
344+/* check that argument has no extra characters at the end */
345+#define noextrachars(x) {if ((x)[2] != '\0') return -1;}
346+
347+
348+/* indices of various argument indicators in array args */
349+#define has_i 0 /* -i */
350+#define has_v 1 /* -v */
351+#define has_e 2 /* -e */
352+#define has_E 3 /* -E */
353+
354+#define num_has 4 /* number of 'has_*' */
355+
356+
357+static int collectargs (char **argv, int *args) {
358+ int i;
359+ for (i = 1; argv[i] != NULL; i++) {
360+ if (argv[i][0] != '-') /* not an option? */
361+ return i;
362+ switch (argv[i][1]) { /* option */
363+ case '-':
364+ noextrachars(argv[i]);
365+ return (argv[i+1] != NULL ? i+1 : 0);
366+ case '\0':
367+ return i;
368+ case 'E':
369+ args[has_E] = 1;
370+ break;
371+ case 'i':
372+ noextrachars(argv[i]);
373+ args[has_i] = 1; /* go through */
374+ case 'v':
375+ noextrachars(argv[i]);
376+ args[has_v] = 1;
377+ break;
378+ case 'e':
379+ args[has_e] = 1; /* go through */
380+ case 'l': /* both options need an argument */
381+ if (argv[i][2] == '\0') { /* no concatenated argument? */
382+ i++; /* try next 'argv' */
383+ if (argv[i] == NULL || argv[i][0] == '-')
384+ return -(i - 1); /* no next argument or it is another option */
385+ }
386+ break;
387+ default: /* invalid option; return its index... */
388+ return -i; /* ...as a negative value */
389+ }
390+ }
391+ return 0;
392+}
393+
394+
395+static int runargs (lua_State *L, char **argv, int n) {
396+ int i;
397+ for (i = 1; i < n; i++) {
398+ lua_assert(argv[i][0] == '-');
399+ switch (argv[i][1]) { /* option */
400+ case 'e': {
401+ const char *chunk = argv[i] + 2;
402+ if (*chunk == '\0') chunk = argv[++i];
403+ lua_assert(chunk != NULL);
404+ if (dostring(L, chunk, "=(command line)") != LUA_OK)
405+ return 0;
406+ break;
407+ }
408+ case 'l': {
409+ const char *filename = argv[i] + 2;
410+ if (*filename == '\0') filename = argv[++i];
411+ lua_assert(filename != NULL);
412+ if (dolibrary(L, filename) != LUA_OK)
413+ return 0; /* stop if file fails */
414+ break;
415+ }
416+ default: break;
417+ }
418+ }
419+ return 1;
420+}
421+
422+
423+static int handle_luainit (lua_State *L) {
424+ const char *name = "=" LUA_INITVERSION;
425+ const char *init = getenv(name + 1);
426+ if (init == NULL) {
427+ name = "=" LUA_INIT;
428+ init = getenv(name + 1); /* try alternative name */
429+ }
430+ if (init == NULL) return LUA_OK;
431+ else if (init[0] == '@')
432+ return dofile(L, init+1);
433+ else
434+ return dostring(L, init, name);
435+}
436+
437+
438+static int pmain (lua_State *L) {
439+ int argc = (int)lua_tointeger(L, 1);
440+ char **argv = (char **)lua_touserdata(L, 2);
441+ int script;
442+ int args[num_has];
443+ args[has_i] = args[has_v] = args[has_e] = args[has_E] = 0;
444+ if (argv[0] && argv[0][0]) progname = argv[0];
445+ script = collectargs(argv, args);
446+ if (script < 0) { /* invalid arg? */
447+ print_usage(argv[-script]);
448+ return 0;
449+ }
450+ if (args[has_v]) print_version();
451+ if (args[has_E]) { /* option '-E'? */
452+ lua_pushboolean(L, 1); /* signal for libraries to ignore env. vars. */
453+ lua_setfield(L, LUA_REGISTRYINDEX, "LUA_NOENV");
454+ }
455+ /* open standard libraries */
456+ luaL_checkversion(L);
457+ lua_gc(L, LUA_GCSTOP, 0); /* stop collector during initialization */
458+ luaL_openlibs(L); /* open libraries */
459+ lua_gc(L, LUA_GCRESTART, 0);
460+ if (!args[has_E] && handle_luainit(L) != LUA_OK)
461+ return 0; /* error running LUA_INIT */
462+ /* execute arguments -e and -l */
463+ if (!runargs(L, argv, (script > 0) ? script : argc)) return 0;
464+ /* execute main script (if there is one) */
465+ if (script && handle_script(L, argv, script) != LUA_OK) return 0;
466+ if (args[has_i]) /* -i option? */
467+ dotty(L);
468+ else if (script == 0 && !args[has_e] && !args[has_v]) { /* no arguments? */
469+ if (lua_stdin_is_tty()) {
470+ print_version();
471+ dotty(L);
472+ }
473+ else dofile(L, NULL); /* executes stdin as a file */
474+ }
475+ lua_pushboolean(L, 1); /* signal no errors */
476+ return 1;
477+}
478+
479+
480+int lua_main (int argc, char **argv) {
481+ int status, result;
482+ lua_State *L = luaL_newstate(); /* create state */
483+ if (L == NULL) {
484+ l_message(argv[0], "cannot create state: not enough memory");
485+ return EXIT_FAILURE;
486+ }
487+ /* call 'pmain' in protected mode */
488+ lua_pushcfunction(L, &pmain);
489+ lua_pushinteger(L, argc); /* 1st argument */
490+ lua_pushlightuserdata(L, argv); /* 2nd argument */
491+ status = lua_pcall(L, 2, 1, 0);
492+ result = lua_toboolean(L, -1); /* get result */
493+ finalreport(L, status);
494+ lua_close(L);
495+ return (result && status == LUA_OK) ? EXIT_SUCCESS : EXIT_FAILURE;
496+}
497+