This source file includes following definitions.
- lstop
- laction
- print_usage
- l_message
- report
- traceback
- docall
- print_version
- getargs
- dofile
- dostring
- dolibrary
- get_prompt
- incomplete
- pushline
- loadline
- dotty
- handle_script
- collectargs
- runargs
- handle_luainit
- pmain
- main
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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;
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);
37
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))
78 return 1;
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);
90 lua_pushinteger(L, 2);
91 lua_call(L, 2, 1);
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;
99 lua_pushcfunction(L, traceback);
100 lua_insert(L, base);
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);
105
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++;
121 narg = argc - (n + 1);
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);
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;
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;
184 l = strlen(b);
185 if (l > 0 && b[l-1] == '\n')
186 b[l-1] = '\0';
187 if (firstline && b[0] == '=')
188 lua_pushfstring(L, "return %s", b+1);
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;
201 for (;;) {
202 status = luaL_loadbuffer(L, lua_tostring(L, 1), lua_strlen(L, 1), "=stdin");
203 if (!incomplete(L, status)) break;
204 if (!pushline(L, 0))
205 return -1;
206 lua_pushliteral(L, "\n");
207 lua_insert(L, -2);
208 lua_concat(L, 3);
209 }
210 lua_saveline(L, 1);
211 lua_remove(L, 1);
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) {
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);
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);
243 lua_setglobal(L, "arg");
244 fname = argv[n];
245 if (strcmp(fname, "-") == 0 && strcmp(argv[n-1], "--") != 0)
246 fname = NULL;
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
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] != '-')
265 return i;
266 switch (argv[i][1]) {
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;
275 case 'v':
276 notail(argv[i]);
277 *pv = 1;
278 break;
279 case 'e':
280 *pe = 1;
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;
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]) {
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;
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;
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);
348 luaL_openlibs(L);
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) {
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);
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();
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