OrocosComponentLibrary
2.7.0
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00001 /* 00002 * Copied from the Lua sources. To remain diff'able unused parts are 00003 * disable with #ifdefs 00004 */ 00005 00006 /* 00007 ** $Id: lua.c,v 1.160.1.2 2007/12/28 15:32:23 roberto Exp $ 00008 ** Lua stand-alone interpreter 00009 ** See Copyright Notice in lua.h 00010 */ 00011 00012 00013 #include <signal.h> 00014 #include <stdio.h> 00015 #include <stdlib.h> 00016 #include <string.h> 00017 00018 #define lua_c 00019 00020 #include "lua.h" 00021 00022 #include "lauxlib.h" 00023 #include "lualib.h" 00024 00025 #ifdef LUA_RTT_TLSF 00026 #define RTTLUA_BOILER "OROCOS RTTLua (TLSF)" 00027 #else 00028 #define RTTLUA_BOILER "OROCOS RTTLua" 00029 #endif 00030 #define RTTLUA_VERSION "1.0-beta5" 00031 #define XSTR(x) STR(x) 00032 #define STR(x) #x 00033 00034 static lua_State *globalL = NULL; 00035 00036 static const char *progname = LUA_PROGNAME; 00037 00038 00039 00040 static void lstop (lua_State *L, lua_Debug *ar) { 00041 (void)ar; /* unused arg. */ 00042 lua_sethook(L, NULL, 0, 0); 00043 luaL_error(L, "interrupted!"); 00044 } 00045 00046 00047 static void laction (int i) { 00048 signal(i, SIG_DFL); /* if another SIGINT happens before lstop, 00049 terminate process (default action) */ 00050 lua_sethook(globalL, lstop, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1); 00051 } 00052 00053 static void print_usage (void) { 00054 fprintf(stderr, 00055 "usage: %s [options] [script [args]].\n" 00056 "Available options are:\n" 00057 " -e stat execute string " LUA_QL("stat") "\n" 00058 " -l name require library " LUA_QL("name") "\n" 00059 " -i enter interactive mode after executing " LUA_QL("script") "\n" 00060 " -v show version information\n" 00061 " -- stop handling options\n" 00062 " - execute stdin and stop handling options\n" 00063 , 00064 progname); 00065 fflush(stderr); 00066 } 00067 00068 void l_message (const char *pname, const char *msg) { 00069 if (pname) fprintf(stderr, "%s: ", pname); 00070 fprintf(stderr, "%s\n", msg); 00071 fflush(stderr); 00072 } 00073 00074 00075 static int report (lua_State *L, int status) { 00076 if (status && !lua_isnil(L, -1)) { 00077 const char *msg = lua_tostring(L, -1); 00078 if (msg == NULL) msg = "(error object is not a string)"; 00079 l_message(progname, msg); 00080 lua_pop(L, 1); 00081 } 00082 return status; 00083 } 00084 00085 00086 static int traceback (lua_State *L) { 00087 if (!lua_isstring(L, 1)) /* 'message' not a string? */ 00088 return 1; /* keep it intact */ 00089 lua_getfield(L, LUA_GLOBALSINDEX, "debug"); 00090 if (!lua_istable(L, -1)) { 00091 lua_pop(L, 1); 00092 return 1; 00093 } 00094 lua_getfield(L, -1, "traceback"); 00095 if (!lua_isfunction(L, -1)) { 00096 lua_pop(L, 2); 00097 return 1; 00098 } 00099 lua_pushvalue(L, 1); /* pass error message */ 00100 lua_pushinteger(L, 2); /* skip this function and traceback */ 00101 lua_call(L, 2, 1); /* call debug.traceback */ 00102 return 1; 00103 } 00104 00105 00106 static int docall (lua_State *L, int narg, int clear) { 00107 int status; 00108 int base = lua_gettop(L) - narg; /* function index */ 00109 lua_pushcfunction(L, traceback); /* push traceback function */ 00110 lua_insert(L, base); /* put it under chunk and args */ 00111 signal(SIGINT, laction); 00112 status = lua_pcall(L, narg, (clear ? 0 : LUA_MULTRET), base); 00113 signal(SIGINT, SIG_DFL); 00114 lua_remove(L, base); /* remove traceback function */ 00115 /* force a complete garbage collection in case of errors */ 00116 if (status != 0) lua_gc(L, LUA_GCCOLLECT, 0); 00117 return status; 00118 } 00119 00120 static void print_version (void) { 00121 l_message(NULL, RTTLUA_BOILER " " RTTLUA_VERSION " / " LUA_RELEASE " (" XSTR(OROCOS_TARGET) ")" ); 00122 } 00123 00124 static void print_quit_info (void) { 00125 l_message(NULL, " Use Ctrl-d to quit." ); 00126 } 00127 00128 static int getargs (lua_State *L, char **argv, int n) { 00129 int narg; 00130 int i; 00131 int argc = 0; 00132 while (argv[argc]) argc++; /* count total number of arguments */ 00133 narg = argc - (n + 1); /* number of arguments to the script */ 00134 luaL_checkstack(L, narg + 3, "too many arguments to script"); 00135 for (i=n+1; i < argc; i++) 00136 lua_pushstring(L, argv[i]); 00137 lua_createtable(L, narg, n + 1); 00138 for (i=0; i < argc; i++) { 00139 lua_pushstring(L, argv[i]); 00140 lua_rawseti(L, -2, i - n); 00141 } 00142 return narg; 00143 } 00144 00145 00146 int dofile (lua_State *L, const char *name) { 00147 int status = luaL_loadfile(L, name) || docall(L, 0, 1); 00148 return report(L, status); 00149 } 00150 00151 00152 int dostring (lua_State *L, const char *s, const char *name) { 00153 int status = luaL_loadbuffer(L, s, strlen(s), name) || docall(L, 0, 1); 00154 return report(L, status); 00155 } 00156 00157 static int dolibrary (lua_State *L, const char *name) { 00158 lua_getglobal(L, "require"); 00159 lua_pushstring(L, name); 00160 return report(L, docall(L, 1, 1)); 00161 } 00162 00163 static const char *get_prompt (lua_State *L, int firstline) { 00164 const char *p; 00165 lua_getfield(L, LUA_GLOBALSINDEX, firstline ? "_PROMPT" : "_PROMPT2"); 00166 p = lua_tostring(L, -1); 00167 if (p == NULL) p = (firstline ? LUA_PROMPT : LUA_PROMPT2); 00168 lua_pop(L, 1); /* remove global */ 00169 return p; 00170 } 00171 00172 00173 static int incomplete (lua_State *L, int status) { 00174 if (status == LUA_ERRSYNTAX) { 00175 size_t lmsg; 00176 const char *msg = lua_tolstring(L, -1, &lmsg); 00177 const char *tp = msg + lmsg - (sizeof(LUA_QL("<eof>")) - 1); 00178 if (strstr(msg, LUA_QL("<eof>")) == tp) { 00179 lua_pop(L, 1); 00180 return 1; 00181 } 00182 } 00183 return 0; /* else... */ 00184 } 00185 00186 00187 static int pushline (lua_State *L, int firstline) { 00188 char buffer[LUA_MAXINPUT]; 00189 char *b = buffer; 00190 size_t l; 00191 const char *prmt = get_prompt(L, firstline); 00192 if (lua_readline(L, b, prmt) == 0) 00193 return 0; /* no input */ 00194 l = strlen(b); 00195 if (l > 0 && b[l-1] == '\n') /* line ends with newline? */ 00196 b[l-1] = '\0'; /* remove it */ 00197 if (firstline && b[0] == '=') /* first line starts with `=' ? */ 00198 lua_pushfstring(L, "return %s", b+1); /* change it to `return' */ 00199 else 00200 lua_pushstring(L, b); 00201 lua_freeline(L, b); 00202 return 1; 00203 } 00204 00205 00206 static int loadline (lua_State *L) { 00207 int status; 00208 lua_settop(L, 0); 00209 if (!pushline(L, 1)) 00210 return -1; /* no input */ 00211 for (;;) { /* repeat until gets a complete line */ 00212 status = luaL_loadbuffer(L, lua_tostring(L, 1), lua_strlen(L, 1), "=stdin"); 00213 if (!incomplete(L, status)) break; /* cannot try to add lines? */ 00214 if (!pushline(L, 0)) /* no more input? */ 00215 return -1; 00216 lua_pushliteral(L, "\n"); /* add a new line... */ 00217 lua_insert(L, -2); /* ...between the two lines */ 00218 lua_concat(L, 3); /* join them */ 00219 } 00220 lua_saveline(L, 1); 00221 lua_remove(L, 1); /* remove line */ 00222 return status; 00223 } 00224 00225 00226 void dotty (lua_State *L) { 00227 int status; 00228 const char *oldprogname = progname; 00229 progname = NULL; 00230 while ((status = loadline(L)) != -1) { 00231 if (status == 0) status = docall(L, 0, 0); 00232 report(L, status); 00233 if (status == 0 && lua_gettop(L) > 0) { /* any result to print? */ 00234 lua_getglobal(L, "print"); 00235 lua_insert(L, 1); 00236 if (lua_pcall(L, lua_gettop(L)-1, 0, 0) != 0) 00237 l_message(progname, lua_pushfstring(L, 00238 "error calling " LUA_QL("print") " (%s)", 00239 lua_tostring(L, -1))); 00240 } 00241 } 00242 lua_settop(L, 0); /* clear stack */ 00243 fputs("\n", stdout); 00244 fflush(stdout); 00245 progname = oldprogname; 00246 } 00247 00248 00249 static int handle_script (lua_State *L, char **argv, int n) { 00250 int status; 00251 const char *fname; 00252 int narg = getargs(L, argv, n); /* collect arguments */ 00253 lua_setglobal(L, "arg"); 00254 fname = argv[n]; 00255 if (strcmp(fname, "-") == 0 && strcmp(argv[n-1], "--") != 0) 00256 fname = NULL; /* stdin */ 00257 status = luaL_loadfile(L, fname); 00258 lua_insert(L, -(narg+1)); 00259 if (status == 0) 00260 status = docall(L, narg, 0); 00261 else 00262 lua_pop(L, narg); 00263 return report(L, status); 00264 } 00265 00266 00267 /* check that argument has no extra characters at the end */ 00268 #define notail(x) {if ((x)[2] != '\0') return -1;} 00269 00270 00271 static int collectargs (char **argv, int *pi, int *pv, int *pe) { 00272 int i; 00273 for (i = 1; argv[i] != NULL; i++) { 00274 if (argv[i][0] != '-') /* not an option? */ 00275 return i; 00276 switch (argv[i][1]) { /* option */ 00277 case '-': 00278 notail(argv[i]); 00279 return (argv[i+1] != NULL ? i+1 : 0); 00280 case '\0': 00281 return i; 00282 case 'i': 00283 notail(argv[i]); 00284 *pi = 1; /* go through */ 00285 case 'v': 00286 notail(argv[i]); 00287 *pv = 1; 00288 break; 00289 case 'e': 00290 *pe = 1; /* go through */ 00291 case 'l': 00292 if (argv[i][2] == '\0') { 00293 i++; 00294 if (argv[i] == NULL) return -1; 00295 } 00296 break; 00297 default: return -1; /* invalid option */ 00298 } 00299 } 00300 return 0; 00301 } 00302 00303 00304 static int runargs (lua_State *L, char **argv, int n) { 00305 int i; 00306 for (i = 1; i < n; i++) { 00307 if (argv[i] == NULL) continue; 00308 lua_assert(argv[i][0] == '-'); 00309 switch (argv[i][1]) { /* option */ 00310 case 'e': { 00311 const char *chunk = argv[i] + 2; 00312 if (*chunk == '\0') chunk = argv[++i]; 00313 lua_assert(chunk != NULL); 00314 if (dostring(L, chunk, "=(command line)") != 0) 00315 return 1; 00316 break; 00317 } 00318 case 'l': { 00319 const char *filename = argv[i] + 2; 00320 if (*filename == '\0') filename = argv[++i]; 00321 lua_assert(filename != NULL); 00322 if (dolibrary(L, filename)) 00323 return 1; /* stop if file fails */ 00324 break; 00325 } 00326 default: break; 00327 } 00328 } 00329 return 0; 00330 } 00331 00332 00333 static int handle_luainit (lua_State *L) { 00334 const char *init = getenv(LUA_INIT); 00335 if (init == NULL) return 0; /* status OK */ 00336 else if (init[0] == '@') 00337 return dofile(L, init+1); 00338 else 00339 return dostring(L, init, "=" LUA_INIT); 00340 } 00341 00342 00343 struct Smain { 00344 int argc; 00345 char **argv; 00346 int status; 00347 }; 00348 00349 00350 static int pmain (lua_State *L) { 00351 struct Smain *s = (struct Smain *)lua_touserdata(L, 1); 00352 char **argv = s->argv; 00353 int script; 00354 int has_i = 0, has_v = 0, has_e = 0; 00355 globalL = L; 00356 if (argv[0] && argv[0][0]) progname = argv[0]; 00357 lua_gc(L, LUA_GCSTOP, 0); /* stop collector during initialization */ 00358 luaL_openlibs(L); /* open libraries */ 00359 lua_gc(L, LUA_GCRESTART, 0); 00360 s->status = handle_luainit(L); 00361 if (s->status != 0) return 0; 00362 script = collectargs(argv, &has_i, &has_v, &has_e); 00363 if (script < 0) { /* invalid args? */ 00364 print_usage(); 00365 s->status = 1; 00366 return 0; 00367 } 00368 if (has_v) print_version(); 00369 s->status = runargs(L, argv, (script > 0) ? script : s->argc); 00370 if (s->status != 0) return 0; 00371 if (script) 00372 s->status = handle_script(L, argv, script); 00373 if (s->status != 0) return 0; 00374 if (has_i) 00375 dotty(L); 00376 else if (script == 0 && !has_e && !has_v) { 00377 if (lua_stdin_is_tty()) { 00378 print_version(); 00379 print_quit_info(); 00380 dotty(L); 00381 } 00382 else dofile(L, NULL); /* executes stdin as a file */ 00383 } 00384 return 0; 00385 } 00386 00387 #if 0 00388 int main (int argc, char **argv) { 00389 int status; 00390 struct Smain s; 00391 lua_State *L = lua_open(); /* create state */ 00392 if (L == NULL) { 00393 l_message(argv[0], "cannot create state: not enough memory"); 00394 return EXIT_FAILURE; 00395 } 00396 s.argc = argc; 00397 s.argv = argv; 00398 status = lua_cpcall(L, &pmain, &s); 00399 report(L, status); 00400 lua_close(L); 00401 return (status || s.status) ? EXIT_FAILURE : EXIT_SUCCESS; 00402 } 00403 #endif 00404 00405 int main_args (lua_State *L, int argc, char **argv) { 00406 int status; 00407 struct Smain s; 00408 00409 s.argc = argc; 00410 s.argv = argv; 00411 status = lua_cpcall(L, &pmain, &s); 00412 report(L, status); 00413 return (status || s.status) ? EXIT_FAILURE : EXIT_SUCCESS; 00414 }