1 | /* |
---|
2 | ** $Id: lua.c,v 1.160.1.2 2007/12/28 15:32:23 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 | |
---|
22 | static lua_State *globalL = NULL; |
---|
23 | |
---|
24 | static const char *progname = LUA_PROGNAME; |
---|
25 | |
---|
26 | |
---|
27 | |
---|
28 | static void lstop (lua_State *L, lua_Debug *ar) { |
---|
29 | (void)ar; /* unused arg. */ |
---|
30 | lua_sethook(L, NULL, 0, 0); |
---|
31 | luaL_error(L, "interrupted!"); |
---|
32 | } |
---|
33 | |
---|
34 | |
---|
35 | static void laction (int i) { |
---|
36 | signal(i, SIG_DFL); /* if another SIGINT happens before lstop, |
---|
37 | terminate process (default action) */ |
---|
38 | lua_sethook(globalL, lstop, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1); |
---|
39 | } |
---|
40 | |
---|
41 | |
---|
42 | static void print_usage (void) { |
---|
43 | fprintf(stderr, |
---|
44 | "usage: %s [options] [script [args]].\n" |
---|
45 | "Available options are:\n" |
---|
46 | " -e stat execute string " LUA_QL("stat") "\n" |
---|
47 | " -l name require library " LUA_QL("name") "\n" |
---|
48 | " -i enter interactive mode after executing " LUA_QL("script") "\n" |
---|
49 | " -v show version information\n" |
---|
50 | " -- stop handling options\n" |
---|
51 | " - execute stdin and stop handling options\n" |
---|
52 | , |
---|
53 | progname); |
---|
54 | fflush(stderr); |
---|
55 | } |
---|
56 | |
---|
57 | |
---|
58 | static void l_message (const char *pname, const char *msg) { |
---|
59 | if (pname) fprintf(stderr, "%s: ", pname); |
---|
60 | fprintf(stderr, "%s\n", msg); |
---|
61 | fflush(stderr); |
---|
62 | } |
---|
63 | |
---|
64 | |
---|
65 | static int report (lua_State *L, int status) { |
---|
66 | if (status && !lua_isnil(L, -1)) { |
---|
67 | const char *msg = lua_tostring(L, -1); |
---|
68 | if (msg == NULL) msg = "(error object is not a string)"; |
---|
69 | l_message(progname, msg); |
---|
70 | lua_pop(L, 1); |
---|
71 | } |
---|
72 | return status; |
---|
73 | } |
---|
74 | |
---|
75 | |
---|
76 | static int traceback (lua_State *L) { |
---|
77 | if (!lua_isstring(L, 1)) /* 'message' not a string? */ |
---|
78 | return 1; /* keep it intact */ |
---|
79 | lua_getfield(L, LUA_GLOBALSINDEX, "debug"); |
---|
80 | if (!lua_istable(L, -1)) { |
---|
81 | lua_pop(L, 1); |
---|
82 | return 1; |
---|
83 | } |
---|
84 | lua_getfield(L, -1, "traceback"); |
---|
85 | if (!lua_isfunction(L, -1)) { |
---|
86 | lua_pop(L, 2); |
---|
87 | return 1; |
---|
88 | } |
---|
89 | lua_pushvalue(L, 1); /* pass error message */ |
---|
90 | lua_pushinteger(L, 2); /* skip this function and traceback */ |
---|
91 | lua_call(L, 2, 1); /* call debug.traceback */ |
---|
92 | return 1; |
---|
93 | } |
---|
94 | |
---|
95 | |
---|
96 | static int docall (lua_State *L, int narg, int clear) { |
---|
97 | int status; |
---|
98 | int base = lua_gettop(L) - narg; /* function index */ |
---|
99 | lua_pushcfunction(L, traceback); /* push traceback function */ |
---|
100 | lua_insert(L, base); /* put it under chunk and args */ |
---|
101 | signal(SIGINT, laction); |
---|
102 | status = lua_pcall(L, narg, (clear ? 0 : LUA_MULTRET), base); |
---|
103 | signal(SIGINT, SIG_DFL); |
---|
104 | lua_remove(L, base); /* remove traceback function */ |
---|
105 | /* force a complete garbage collection in case of errors */ |
---|
106 | if (status != 0) lua_gc(L, LUA_GCCOLLECT, 0); |
---|
107 | return status; |
---|
108 | } |
---|
109 | |
---|
110 | |
---|
111 | static void print_version (void) { |
---|
112 | l_message(NULL, LUA_RELEASE " " LUA_COPYRIGHT); |
---|
113 | } |
---|
114 | |
---|
115 | |
---|
116 | static int getargs (lua_State *L, char **argv, int n) { |
---|
117 | int narg; |
---|
118 | int i; |
---|
119 | int argc = 0; |
---|
120 | while (argv[argc]) argc++; /* count total number of arguments */ |
---|
121 | narg = argc - (n + 1); /* number of arguments to the script */ |
---|
122 | luaL_checkstack(L, narg + 3, "too many arguments to script"); |
---|
123 | for (i=n+1; i < argc; i++) |
---|
124 | lua_pushstring(L, argv[i]); |
---|
125 | lua_createtable(L, narg, n + 1); |
---|
126 | for (i=0; i < argc; i++) { |
---|
127 | lua_pushstring(L, argv[i]); |
---|
128 | lua_rawseti(L, -2, i - n); |
---|
129 | } |
---|
130 | return narg; |
---|
131 | } |
---|
132 | |
---|
133 | |
---|
134 | static int dofile (lua_State *L, const char *name) { |
---|
135 | int status = luaL_loadfile(L, name) || docall(L, 0, 1); |
---|
136 | return report(L, status); |
---|
137 | } |
---|
138 | |
---|
139 | |
---|
140 | static int dostring (lua_State *L, const char *s, const char *name) { |
---|
141 | int status = luaL_loadbuffer(L, s, strlen(s), name) || docall(L, 0, 1); |
---|
142 | return report(L, status); |
---|
143 | } |
---|
144 | |
---|
145 | |
---|
146 | static int dolibrary (lua_State *L, const char *name) { |
---|
147 | lua_getglobal(L, "require"); |
---|
148 | lua_pushstring(L, name); |
---|
149 | return report(L, docall(L, 1, 1)); |
---|
150 | } |
---|
151 | |
---|
152 | |
---|
153 | static const char *get_prompt (lua_State *L, int firstline) { |
---|
154 | const char *p; |
---|
155 | lua_getfield(L, LUA_GLOBALSINDEX, firstline ? "_PROMPT" : "_PROMPT2"); |
---|
156 | p = lua_tostring(L, -1); |
---|
157 | if (p == NULL) p = (firstline ? LUA_PROMPT : LUA_PROMPT2); |
---|
158 | lua_pop(L, 1); /* remove global */ |
---|
159 | return p; |
---|
160 | } |
---|
161 | |
---|
162 | |
---|
163 | static int incomplete (lua_State *L, int status) { |
---|
164 | if (status == LUA_ERRSYNTAX) { |
---|
165 | size_t lmsg; |
---|
166 | const char *msg = lua_tolstring(L, -1, &lmsg); |
---|
167 | const char *tp = msg + lmsg - (sizeof(LUA_QL("<eof>")) - 1); |
---|
168 | if (strstr(msg, LUA_QL("<eof>")) == tp) { |
---|
169 | lua_pop(L, 1); |
---|
170 | return 1; |
---|
171 | } |
---|
172 | } |
---|
173 | return 0; /* else... */ |
---|
174 | } |
---|
175 | |
---|
176 | |
---|
177 | static int pushline (lua_State *L, int firstline) { |
---|
178 | char buffer[LUA_MAXINPUT]; |
---|
179 | char *b = buffer; |
---|
180 | size_t l; |
---|
181 | const char *prmt = get_prompt(L, firstline); |
---|
182 | if (lua_readline(L, b, prmt) == 0) |
---|
183 | return 0; /* no input */ |
---|
184 | l = strlen(b); |
---|
185 | if (l > 0 && b[l-1] == '\n') /* line ends with newline? */ |
---|
186 | b[l-1] = '\0'; /* remove it */ |
---|
187 | if (firstline && b[0] == '=') /* first line starts with `=' ? */ |
---|
188 | lua_pushfstring(L, "return %s", b+1); /* change it to `return' */ |
---|
189 | else |
---|
190 | lua_pushstring(L, b); |
---|
191 | lua_freeline(L, b); |
---|
192 | return 1; |
---|
193 | } |
---|
194 | |
---|
195 | |
---|
196 | static int loadline (lua_State *L) { |
---|
197 | int status; |
---|
198 | lua_settop(L, 0); |
---|
199 | if (!pushline(L, 1)) |
---|
200 | return -1; /* no input */ |
---|
201 | for (;;) { /* repeat until gets a complete line */ |
---|
202 | status = luaL_loadbuffer(L, lua_tostring(L, 1), lua_strlen(L, 1), "=stdin"); |
---|
203 | if (!incomplete(L, status)) break; /* cannot try to add lines? */ |
---|
204 | if (!pushline(L, 0)) /* no more input? */ |
---|
205 | return -1; |
---|
206 | lua_pushliteral(L, "\n"); /* add a new line... */ |
---|
207 | lua_insert(L, -2); /* ...between the two lines */ |
---|
208 | lua_concat(L, 3); /* join them */ |
---|
209 | } |
---|
210 | lua_saveline(L, 1); |
---|
211 | lua_remove(L, 1); /* remove line */ |
---|
212 | return status; |
---|
213 | } |
---|
214 | |
---|
215 | |
---|
216 | static void dotty (lua_State *L) { |
---|
217 | int status; |
---|
218 | const char *oldprogname = progname; |
---|
219 | progname = NULL; |
---|
220 | while ((status = loadline(L)) != -1) { |
---|
221 | if (status == 0) status = docall(L, 0, 0); |
---|
222 | report(L, status); |
---|
223 | if (status == 0 && lua_gettop(L) > 0) { /* any result to print? */ |
---|
224 | lua_getglobal(L, "print"); |
---|
225 | lua_insert(L, 1); |
---|
226 | if (lua_pcall(L, lua_gettop(L)-1, 0, 0) != 0) |
---|
227 | l_message(progname, lua_pushfstring(L, |
---|
228 | "error calling " LUA_QL("print") " (%s)", |
---|
229 | lua_tostring(L, -1))); |
---|
230 | } |
---|
231 | } |
---|
232 | lua_settop(L, 0); /* clear stack */ |
---|
233 | fputs("\n", stdout); |
---|
234 | fflush(stdout); |
---|
235 | progname = oldprogname; |
---|
236 | } |
---|
237 | |
---|
238 | |
---|
239 | static int handle_script (lua_State *L, char **argv, int n) { |
---|
240 | int status; |
---|
241 | const char *fname; |
---|
242 | int narg = getargs(L, argv, n); /* collect arguments */ |
---|
243 | lua_setglobal(L, "arg"); |
---|
244 | fname = argv[n]; |
---|
245 | if (strcmp(fname, "-") == 0 && strcmp(argv[n-1], "--") != 0) |
---|
246 | fname = NULL; /* stdin */ |
---|
247 | status = luaL_loadfile(L, fname); |
---|
248 | lua_insert(L, -(narg+1)); |
---|
249 | if (status == 0) |
---|
250 | status = docall(L, narg, 0); |
---|
251 | else |
---|
252 | lua_pop(L, narg); |
---|
253 | return report(L, status); |
---|
254 | } |
---|
255 | |
---|
256 | |
---|
257 | /* check that argument has no extra characters at the end */ |
---|
258 | #define notail(x) {if ((x)[2] != '\0') return -1;} |
---|
259 | |
---|
260 | |
---|
261 | static int collectargs (char **argv, int *pi, int *pv, int *pe) { |
---|
262 | int i; |
---|
263 | for (i = 1; argv[i] != NULL; i++) { |
---|
264 | if (argv[i][0] != '-') /* not an option? */ |
---|
265 | return i; |
---|
266 | switch (argv[i][1]) { /* option */ |
---|
267 | case '-': |
---|
268 | notail(argv[i]); |
---|
269 | return (argv[i+1] != NULL ? i+1 : 0); |
---|
270 | case '\0': |
---|
271 | return i; |
---|
272 | case 'i': |
---|
273 | notail(argv[i]); |
---|
274 | *pi = 1; /* go through */ |
---|
275 | case 'v': |
---|
276 | notail(argv[i]); |
---|
277 | *pv = 1; |
---|
278 | break; |
---|
279 | case 'e': |
---|
280 | *pe = 1; /* go through */ |
---|
281 | case 'l': |
---|
282 | if (argv[i][2] == '\0') { |
---|
283 | i++; |
---|
284 | if (argv[i] == NULL) return -1; |
---|
285 | } |
---|
286 | break; |
---|
287 | default: return -1; /* invalid option */ |
---|
288 | } |
---|
289 | } |
---|
290 | return 0; |
---|
291 | } |
---|
292 | |
---|
293 | |
---|
294 | static int runargs (lua_State *L, char **argv, int n) { |
---|
295 | int i; |
---|
296 | for (i = 1; i < n; i++) { |
---|
297 | if (argv[i] == NULL) continue; |
---|
298 | lua_assert(argv[i][0] == '-'); |
---|
299 | switch (argv[i][1]) { /* option */ |
---|
300 | case 'e': { |
---|
301 | const char *chunk = argv[i] + 2; |
---|
302 | if (*chunk == '\0') chunk = argv[++i]; |
---|
303 | lua_assert(chunk != NULL); |
---|
304 | if (dostring(L, chunk, "=(command line)") != 0) |
---|
305 | return 1; |
---|
306 | break; |
---|
307 | } |
---|
308 | case 'l': { |
---|
309 | const char *filename = argv[i] + 2; |
---|
310 | if (*filename == '\0') filename = argv[++i]; |
---|
311 | lua_assert(filename != NULL); |
---|
312 | if (dolibrary(L, filename)) |
---|
313 | return 1; /* stop if file fails */ |
---|
314 | break; |
---|
315 | } |
---|
316 | default: break; |
---|
317 | } |
---|
318 | } |
---|
319 | return 0; |
---|
320 | } |
---|
321 | |
---|
322 | |
---|
323 | static int handle_luainit (lua_State *L) { |
---|
324 | const char *init = getenv(LUA_INIT); |
---|
325 | if (init == NULL) return 0; /* status OK */ |
---|
326 | else if (init[0] == '@') |
---|
327 | return dofile(L, init+1); |
---|
328 | else |
---|
329 | return dostring(L, init, "=" LUA_INIT); |
---|
330 | } |
---|
331 | |
---|
332 | |
---|
333 | struct Smain { |
---|
334 | int argc; |
---|
335 | char **argv; |
---|
336 | int status; |
---|
337 | }; |
---|
338 | |
---|
339 | |
---|
340 | static int pmain (lua_State *L) { |
---|
341 | struct Smain *s = (struct Smain *)lua_touserdata(L, 1); |
---|
342 | char **argv = s->argv; |
---|
343 | int script; |
---|
344 | int has_i = 0, has_v = 0, has_e = 0; |
---|
345 | globalL = L; |
---|
346 | if (argv[0] && argv[0][0]) progname = argv[0]; |
---|
347 | lua_gc(L, LUA_GCSTOP, 0); /* stop collector during initialization */ |
---|
348 | luaL_openlibs(L); /* open libraries */ |
---|
349 | lua_gc(L, LUA_GCRESTART, 0); |
---|
350 | s->status = handle_luainit(L); |
---|
351 | if (s->status != 0) return 0; |
---|
352 | script = collectargs(argv, &has_i, &has_v, &has_e); |
---|
353 | if (script < 0) { /* invalid args? */ |
---|
354 | print_usage(); |
---|
355 | s->status = 1; |
---|
356 | return 0; |
---|
357 | } |
---|
358 | if (has_v) print_version(); |
---|
359 | s->status = runargs(L, argv, (script > 0) ? script : s->argc); |
---|
360 | if (s->status != 0) return 0; |
---|
361 | if (script) |
---|
362 | s->status = handle_script(L, argv, script); |
---|
363 | if (s->status != 0) return 0; |
---|
364 | if (has_i) |
---|
365 | dotty(L); |
---|
366 | else if (script == 0 && !has_e && !has_v) { |
---|
367 | if (lua_stdin_is_tty()) { |
---|
368 | print_version(); |
---|
369 | dotty(L); |
---|
370 | } |
---|
371 | else dofile(L, NULL); /* executes stdin as a file */ |
---|
372 | } |
---|
373 | return 0; |
---|
374 | } |
---|
375 | |
---|
376 | |
---|
377 | int main (int argc, char **argv) { |
---|
378 | int status; |
---|
379 | struct Smain s; |
---|
380 | lua_State *L = lua_open(); /* create state */ |
---|
381 | if (L == NULL) { |
---|
382 | l_message(argv[0], "cannot create state: not enough memory"); |
---|
383 | return EXIT_FAILURE; |
---|
384 | } |
---|
385 | s.argc = argc; |
---|
386 | s.argv = argv; |
---|
387 | status = lua_cpcall(L, &pmain, &s); |
---|
388 | report(L, status); |
---|
389 | lua_close(L); |
---|
390 | return (status || s.status) ? EXIT_FAILURE : EXIT_SUCCESS; |
---|
391 | } |
---|
392 | |
---|