aboutsummaryrefslogtreecommitdiff
path: root/lua.c
diff options
context:
space:
mode:
Diffstat (limited to 'lua.c')
-rw-r--r--lua.c390
1 files changed, 0 insertions, 390 deletions
diff --git a/lua.c b/lua.c
deleted file mode 100644
index b8cf32ed..00000000
--- a/lua.c
+++ /dev/null
@@ -1,390 +0,0 @@
1/*
2** $Id: lua.c,v 1.159 2006/05/24 14:16:39 roberto Exp roberto $
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
22static lua_State *globalL = NULL;
23
24static const char *progname = LUA_PROGNAME;
25
26
27
28static 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
35static 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
42static 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
58static 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
65static 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
76static int traceback (lua_State *L) {
77 lua_getfield(L, LUA_GLOBALSINDEX, "debug");
78 if (!lua_istable(L, -1)) {
79 lua_pop(L, 1);
80 return 1;
81 }
82 lua_getfield(L, -1, "traceback");
83 if (!lua_isfunction(L, -1)) {
84 lua_pop(L, 2);
85 return 1;
86 }
87 lua_pushvalue(L, 1); /* pass error message */
88 lua_pushinteger(L, 2); /* skip this function and traceback */
89 lua_call(L, 2, 1); /* call debug.traceback */
90 return 1;
91}
92
93
94static int docall (lua_State *L, int narg, int clear) {
95 int status;
96 int base = lua_gettop(L) - narg; /* function index */
97 lua_pushcfunction(L, traceback); /* push traceback function */
98 lua_insert(L, base); /* put it under chunk and args */
99 signal(SIGINT, laction);
100 status = lua_pcall(L, narg, (clear ? 0 : LUA_MULTRET), base);
101 signal(SIGINT, SIG_DFL);
102 lua_remove(L, base); /* remove traceback function */
103 /* force a complete garbage collection in case of errors */
104 if (status != 0) lua_gc(L, LUA_GCCOLLECT, 0);
105 return status;
106}
107
108
109static void print_version (void) {
110 l_message(NULL, LUA_RELEASE " " LUA_COPYRIGHT);
111}
112
113
114static int getargs (lua_State *L, char **argv, int n) {
115 int narg;
116 int i;
117 int argc = 0;
118 while (argv[argc]) argc++; /* count total number of arguments */
119 narg = argc - (n + 1); /* number of arguments to the script */
120 luaL_checkstack(L, narg + 3, "too many arguments to script");
121 for (i=n+1; i < argc; i++)
122 lua_pushstring(L, argv[i]);
123 lua_createtable(L, narg, n + 1);
124 for (i=0; i < argc; i++) {
125 lua_pushstring(L, argv[i]);
126 lua_rawseti(L, -2, i - n);
127 }
128 return narg;
129}
130
131
132static int dofile (lua_State *L, const char *name) {
133 int status = luaL_loadfile(L, name) || docall(L, 0, 1);
134 return report(L, status);
135}
136
137
138static int dostring (lua_State *L, const char *s, const char *name) {
139 int status = luaL_loadbuffer(L, s, strlen(s), name) || docall(L, 0, 1);
140 return report(L, status);
141}
142
143
144static int dolibrary (lua_State *L, const char *name) {
145 lua_getglobal(L, "require");
146 lua_pushstring(L, name);
147 return report(L, lua_pcall(L, 1, 0, 0));
148}
149
150
151static const char *get_prompt (lua_State *L, int firstline) {
152 const char *p;
153 lua_getfield(L, LUA_GLOBALSINDEX, firstline ? "_PROMPT" : "_PROMPT2");
154 p = lua_tostring(L, -1);
155 if (p == NULL) p = (firstline ? LUA_PROMPT : LUA_PROMPT2);
156 lua_pop(L, 1); /* remove global */
157 return p;
158}
159
160
161static int incomplete (lua_State *L, int status) {
162 if (status == LUA_ERRSYNTAX) {
163 size_t lmsg;
164 const char *msg = lua_tolstring(L, -1, &lmsg);
165 const char *tp = msg + lmsg - (sizeof(LUA_QL("<eof>")) - 1);
166 if (strstr(msg, LUA_QL("<eof>")) == tp) {
167 lua_pop(L, 1);
168 return 1;
169 }
170 }
171 return 0; /* else... */
172}
173
174
175static int pushline (lua_State *L, int firstline) {
176 char buffer[LUA_MAXINPUT];
177 char *b = buffer;
178 size_t l;
179 const char *prmt = get_prompt(L, firstline);
180 if (lua_readline(L, b, prmt) == 0)
181 return 0; /* no input */
182 l = strlen(b);
183 if (l > 0 && b[l-1] == '\n') /* line ends with newline? */
184 b[l-1] = '\0'; /* remove it */
185 if (firstline && b[0] == '=') /* first line starts with `=' ? */
186 lua_pushfstring(L, "return %s", b+1); /* change it to `return' */
187 else
188 lua_pushstring(L, b);
189 lua_freeline(L, b);
190 return 1;
191}
192
193
194static int loadline (lua_State *L) {
195 int status;
196 lua_settop(L, 0);
197 if (!pushline(L, 1))
198 return -1; /* no input */
199 for (;;) { /* repeat until gets a complete line */
200 status = luaL_loadbuffer(L, lua_tostring(L, 1), lua_strlen(L, 1), "=stdin");
201 if (!incomplete(L, status)) break; /* cannot try to add lines? */
202 if (!pushline(L, 0)) /* no more input? */
203 return -1;
204 lua_pushliteral(L, "\n"); /* add a new line... */
205 lua_insert(L, -2); /* ...between the two lines */
206 lua_concat(L, 3); /* join them */
207 }
208 lua_saveline(L, 1);
209 lua_remove(L, 1); /* remove line */
210 return status;
211}
212
213
214static void dotty (lua_State *L) {
215 int status;
216 const char *oldprogname = progname;
217 progname = NULL;
218 while ((status = loadline(L)) != -1) {
219 if (status == 0) status = docall(L, 0, 0);
220 report(L, status);
221 if (status == 0 && lua_gettop(L) > 0) { /* any result to print? */
222 lua_getglobal(L, "print");
223 lua_insert(L, 1);
224 if (lua_pcall(L, lua_gettop(L)-1, 0, 0) != 0)
225 l_message(progname, lua_pushfstring(L,
226 "error calling " LUA_QL("print") " (%s)",
227 lua_tostring(L, -1)));
228 }
229 }
230 lua_settop(L, 0); /* clear stack */
231 fputs("\n", stdout);
232 fflush(stdout);
233 progname = oldprogname;
234}
235
236
237static int handle_script (lua_State *L, char **argv, int n) {
238 int status;
239 const char *fname;
240 int narg = getargs(L, argv, n); /* collect arguments */
241 lua_setglobal(L, "arg");
242 fname = argv[n];
243 if (strcmp(fname, "-") == 0 && strcmp(argv[n-1], "--") != 0)
244 fname = NULL; /* stdin */
245 status = luaL_loadfile(L, fname);
246 lua_insert(L, -(narg+1));
247 if (status == 0)
248 status = docall(L, narg, 0);
249 else
250 lua_pop(L, narg);
251 return report(L, status);
252}
253
254
255/* check that argument has no extra characters at the end */
256#define notail(x) {if ((x)[2] != '\0') return -1;}
257
258
259static int collectargs (char **argv, int *pi, int *pv, int *pe) {
260 int i;
261 for (i = 1; argv[i] != NULL; i++) {
262 if (argv[i][0] != '-') /* not an option? */
263 return i;
264 switch (argv[i][1]) { /* option */
265 case '-':
266 notail(argv[i]);
267 return (argv[i+1] != NULL ? i+1 : 0);
268 case '\0':
269 return i;
270 case 'i':
271 notail(argv[i]);
272 *pi = 1; /* go through */
273 case 'v':
274 notail(argv[i]);
275 *pv = 1;
276 break;
277 case 'e':
278 *pe = 1; /* go through */
279 case 'l':
280 if (argv[i][2] == '\0') {
281 i++;
282 if (argv[i] == NULL) return -1;
283 }
284 break;
285 default: return -1; /* invalid option */
286 }
287 }
288 return 0;
289}
290
291
292static int runargs (lua_State *L, char **argv, int n) {
293 int i;
294 for (i = 1; i < n; i++) {
295 if (argv[i] == NULL) continue;
296 lua_assert(argv[i][0] == '-');
297 switch (argv[i][1]) { /* option */
298 case 'e': {
299 const char *chunk = argv[i] + 2;
300 if (*chunk == '\0') chunk = argv[++i];
301 lua_assert(chunk != NULL);
302 if (dostring(L, chunk, "=(command line)") != 0)
303 return 1;
304 break;
305 }
306 case 'l': {
307 const char *filename = argv[i] + 2;
308 if (*filename == '\0') filename = argv[++i];
309 lua_assert(filename != NULL);
310 if (dolibrary(L, filename))
311 return 1; /* stop if file fails */
312 break;
313 }
314 default: break;
315 }
316 }
317 return 0;
318}
319
320
321static int handle_luainit (lua_State *L) {
322 const char *init = getenv(LUA_INIT);
323 if (init == NULL) return 0; /* status OK */
324 else if (init[0] == '@')
325 return dofile(L, init+1);
326 else
327 return dostring(L, init, "=" LUA_INIT);
328}
329
330
331struct Smain {
332 int argc;
333 char **argv;
334 int status;
335};
336
337
338static int pmain (lua_State *L) {
339 struct Smain *s = (struct Smain *)lua_touserdata(L, 1);
340 char **argv = s->argv;
341 int script;
342 int has_i = 0, has_v = 0, has_e = 0;
343 globalL = L;
344 if (argv[0] && argv[0][0]) progname = argv[0];
345 lua_gc(L, LUA_GCSTOP, 0); /* stop collector during initialization */
346 luaL_openlibs(L); /* open libraries */
347 lua_gc(L, LUA_GCRESTART, 0);
348 s->status = handle_luainit(L);
349 if (s->status != 0) return 0;
350 script = collectargs(argv, &has_i, &has_v, &has_e);
351 if (script < 0) { /* invalid args? */
352 print_usage();
353 s->status = 1;
354 return 0;
355 }
356 if (has_v) print_version();
357 s->status = runargs(L, argv, (script > 0) ? script : s->argc);
358 if (s->status != 0) return 0;
359 if (script)
360 s->status = handle_script(L, argv, script);
361 if (s->status != 0) return 0;
362 if (has_i)
363 dotty(L);
364 else if (script == 0 && !has_e && !has_v) {
365 if (lua_stdin_is_tty()) {
366 print_version();
367 dotty(L);
368 }
369 else dofile(L, NULL); /* executes stdin as a file */
370 }
371 return 0;
372}
373
374
375int main (int argc, char **argv) {
376 int status;
377 struct Smain s;
378 lua_State *L = lua_open(); /* create state */
379 if (L == NULL) {
380 l_message(argv[0], "cannot create state: not enough memory");
381 return EXIT_FAILURE;
382 }
383 s.argc = argc;
384 s.argv = argv;
385 status = lua_cpcall(L, &pmain, &s);
386 report(L, status);
387 lua_close(L);
388 return (status || s.status) ? EXIT_FAILURE : EXIT_SUCCESS;
389}
390
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-03-20 06:34:16 +0000