+/*
+** $Id: lua.c,v 1.206 2012/09/29 20:07:06 roberto Exp $
+** Lua stand-alone interpreter
+** See Copyright Notice in lua.h
+*/
+
+
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define lua_c
+
+#include "lua.h"
+
+#include "lauxlib.h"
+#include "lualib.h"
+
+
+#if !defined(LUA_PROMPT)
+#define LUA_PROMPT "> "
+#define LUA_PROMPT2 ">> "
+#endif
+
+#if !defined(LUA_PROGNAME)
+#define LUA_PROGNAME "lua"
+#endif
+
+#if !defined(LUA_MAXINPUT)
+#define LUA_MAXINPUT 512
+#endif
+
+#if !defined(LUA_INIT)
+#define LUA_INIT "LUA_INIT"
+#endif
+
+#define LUA_INITVERSION \
+ LUA_INIT "_" LUA_VERSION_MAJOR "_" LUA_VERSION_MINOR
+
+
+/*
+** lua_stdin_is_tty detects whether the standard input is a 'tty' (that
+** is, whether we're running lua interactively).
+*/
+#if defined(LUA_USE_ISATTY)
+#include <unistd.h>
+#define lua_stdin_is_tty() isatty(0)
+#elif defined(LUA_WIN)
+#include <io.h>
+#include <stdio.h>
+#define lua_stdin_is_tty() _isatty(_fileno(stdin))
+#else
+#define lua_stdin_is_tty() 1 /* assume stdin is a tty */
+#endif
+
+
+/*
+** lua_readline defines how to show a prompt and then read a line from
+** the standard input.
+** lua_saveline defines how to "save" a read line in a "history".
+** lua_freeline defines how to free a line read by lua_readline.
+*/
+#if defined(LUA_USE_READLINE)
+
+#include <stdio.h>
+#include <readline/readline.h>
+#include <readline/history.h>
+#define lua_readline(L,b,p) ((void)L, ((b)=readline(p)) != NULL)
+#define lua_saveline(L,idx) \
+ if (lua_rawlen(L,idx) > 0) /* non-empty line? */ \
+ add_history(lua_tostring(L, idx)); /* add it to history */
+#define lua_freeline(L,b) ((void)L, free(b))
+
+#elif !defined(lua_readline)
+
+#define lua_readline(L,b,p) \
+ ((void)L, fputs(p, stdout), fflush(stdout), /* show prompt */ \
+ fgets(b, LUA_MAXINPUT, stdin) != NULL) /* get line */
+#define lua_saveline(L,idx) { (void)L; (void)idx; }
+#define lua_freeline(L,b) { (void)L; (void)b; }
+
+#endif
+
+
+
+
+static lua_State *globalL = NULL;
+
+static const char *progname = LUA_PROGNAME;
+
+
+
+static void lstop (lua_State *L, lua_Debug *ar) {
+ (void)ar; /* unused arg. */
+ lua_sethook(L, NULL, 0, 0);
+ luaL_error(L, "interrupted!");
+}
+
+
+static void laction (int i) {
+ signal(i, SIG_DFL); /* if another SIGINT happens before lstop,
+ terminate process (default action) */
+ lua_sethook(globalL, lstop, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1);
+}
+
+
+static void print_usage (const char *badoption) {
+ luai_writestringerror("%s: ", progname);
+ if (badoption[1] == 'e' || badoption[1] == 'l')
+ luai_writestringerror("'%s' needs argument\n", badoption);
+ else
+ luai_writestringerror("unrecognized option '%s'\n", badoption);
+ luai_writestringerror(
+ "usage: %s [options] [script [args]]\n"
+ "Available options are:\n"
+ " -e stat execute string " LUA_QL("stat") "\n"
+ " -i enter interactive mode after executing " LUA_QL("script") "\n"
+ " -l name require library " LUA_QL("name") "\n"
+ " -v show version information\n"
+ " -E ignore environment variables\n"
+ " -- stop handling options\n"
+ " - stop handling options and execute stdin\n"
+ ,
+ progname);
+}
+
+
+static void l_message (const char *pname, const char *msg) {
+ if (pname) luai_writestringerror("%s: ", pname);
+ luai_writestringerror("%s\n", msg);
+}
+
+
+static int report (lua_State *L, int status) {
+ if (status != LUA_OK && !lua_isnil(L, -1)) {
+ const char *msg = lua_tostring(L, -1);
+ if (msg == NULL) msg = "(error object is not a string)";
+ l_message(progname, msg);
+ lua_pop(L, 1);
+ /* force a complete garbage collection in case of errors */
+ lua_gc(L, LUA_GCCOLLECT, 0);
+ }
+ return status;
+}
+
+
+/* the next function is called unprotected, so it must avoid errors */
+static void finalreport (lua_State *L, int status) {
+ if (status != LUA_OK) {
+ const char *msg = (lua_type(L, -1) == LUA_TSTRING) ? lua_tostring(L, -1)
+ : NULL;
+ if (msg == NULL) msg = "(error object is not a string)";
+ l_message(progname, msg);
+ lua_pop(L, 1);
+ }
+}
+
+
+static int traceback (lua_State *L) {
+ const char *msg = lua_tostring(L, 1);
+ if (msg)
+ luaL_traceback(L, L, msg, 1);
+ else if (!lua_isnoneornil(L, 1)) { /* is there an error object? */
+ if (!luaL_callmeta(L, 1, "__tostring")) /* try its 'tostring' metamethod */
+ lua_pushliteral(L, "(no error message)");
+ }
+ return 1;
+}
+
+
+static int docall (lua_State *L, int narg, int nres) {
+ int status;
+ int base = lua_gettop(L) - narg; /* function index */
+ lua_pushcfunction(L, traceback); /* push traceback function */
+ lua_insert(L, base); /* put it under chunk and args */
+ globalL = L; /* to be available to 'laction' */
+ signal(SIGINT, laction);
+ status = lua_pcall(L, narg, nres, base);
+ signal(SIGINT, SIG_DFL);
+ lua_remove(L, base); /* remove traceback function */
+ return status;
+}
+
+
+static void print_version (void) {
+ luai_writestring(LUA_COPYRIGHT, strlen(LUA_COPYRIGHT));
+ luai_writeline();
+}
+
+
+static int getargs (lua_State *L, char **argv, int n) {
+ int narg;
+ int i;
+ int argc = 0;
+ while (argv[argc]) argc++; /* count total number of arguments */
+ narg = argc - (n + 1); /* number of arguments to the script */
+ luaL_checkstack(L, narg + 3, "too many arguments to script");
+ for (i=n+1; i < argc; i++)
+ lua_pushstring(L, argv[i]);
+ lua_createtable(L, narg, n + 1);
+ for (i=0; i < argc; i++) {
+ lua_pushstring(L, argv[i]);
+ lua_rawseti(L, -2, i - n);
+ }
+ return narg;
+}
+
+
+static int dofile (lua_State *L, const char *name) {
+ int status = luaL_loadfile(L, name);
+ if (status == LUA_OK) status = docall(L, 0, 0);
+ return report(L, status);
+}
+
+
+static int dostring (lua_State *L, const char *s, const char *name) {
+ int status = luaL_loadbuffer(L, s, strlen(s), name);
+ if (status == LUA_OK) status = docall(L, 0, 0);
+ return report(L, status);
+}
+
+
+static int dolibrary (lua_State *L, const char *name) {
+ int status;
+ lua_getglobal(L, "require");
+ lua_pushstring(L, name);
+ status = docall(L, 1, 1); /* call 'require(name)' */
+ if (status == LUA_OK)
+ lua_setglobal(L, name); /* global[name] = require return */
+ return report(L, status);
+}
+
+
+static const char *get_prompt (lua_State *L, int firstline) {
+ const char *p;
+ lua_getglobal(L, firstline ? "_PROMPT" : "_PROMPT2");
+ p = lua_tostring(L, -1);
+ if (p == NULL) p = (firstline ? LUA_PROMPT : LUA_PROMPT2);
+ return p;
+}
+
+/* mark in error messages for incomplete statements */
+#define EOFMARK "<eof>"
+#define marklen (sizeof(EOFMARK)/sizeof(char) - 1)
+
+static int incomplete (lua_State *L, int status) {
+ if (status == LUA_ERRSYNTAX) {
+ size_t lmsg;
+ const char *msg = lua_tolstring(L, -1, &lmsg);
+ if (lmsg >= marklen && strcmp(msg + lmsg - marklen, EOFMARK) == 0) {
+ lua_pop(L, 1);
+ return 1;
+ }
+ }
+ return 0; /* else... */
+}
+
+
+static int pushline (lua_State *L, int firstline) {
+ char buffer[LUA_MAXINPUT];
+ char *b = buffer;
+ size_t l;
+ const char *prmt = get_prompt(L, firstline);
+ int readstatus = lua_readline(L, b, prmt);
+ lua_pop(L, 1); /* remove result from 'get_prompt' */
+ if (readstatus == 0)
+ return 0; /* no input */
+ l = strlen(b);
+ if (l > 0 && b[l-1] == '\n') /* line ends with newline? */
+ b[l-1] = '\0'; /* remove it */
+ if (firstline && b[0] == '=') /* first line starts with `=' ? */
+ lua_pushfstring(L, "return %s", b+1); /* change it to `return' */
+ else
+ lua_pushstring(L, b);
+ lua_freeline(L, b);
+ return 1;
+}
+
+
+static int loadline (lua_State *L) {
+ int status;
+ lua_settop(L, 0);
+ if (!pushline(L, 1))
+ return -1; /* no input */
+ for (;;) { /* repeat until gets a complete line */
+ size_t l;
+ const char *line = lua_tolstring(L, 1, &l);
+ status = luaL_loadbuffer(L, line, l, "=stdin");
+ if (!incomplete(L, status)) break; /* cannot try to add lines? */
+ if (!pushline(L, 0)) /* no more input? */
+ return -1;
+ lua_pushliteral(L, "\n"); /* add a new line... */
+ lua_insert(L, -2); /* ...between the two lines */
+ lua_concat(L, 3); /* join them */
+ }
+ lua_saveline(L, 1);
+ lua_remove(L, 1); /* remove line */
+ return status;
+}
+
+
+static void dotty (lua_State *L) {
+ int status;
+ const char *oldprogname = progname;
+ progname = NULL;
+ while ((status = loadline(L)) != -1) {
+ if (status == LUA_OK) status = docall(L, 0, LUA_MULTRET);
+ report(L, status);
+ if (status == LUA_OK && lua_gettop(L) > 0) { /* any result to print? */
+ luaL_checkstack(L, LUA_MINSTACK, "too many results to print");
+ lua_getglobal(L, "print");
+ lua_insert(L, 1);
+ if (lua_pcall(L, lua_gettop(L)-1, 0, 0) != LUA_OK)
+ l_message(progname, lua_pushfstring(L,
+ "error calling " LUA_QL("print") " (%s)",
+ lua_tostring(L, -1)));
+ }
+ }
+ lua_settop(L, 0); /* clear stack */
+ luai_writeline();
+ progname = oldprogname;
+}
+
+
+static int handle_script (lua_State *L, char **argv, int n) {
+ int status;
+ const char *fname;
+ int narg = getargs(L, argv, n); /* collect arguments */
+ lua_setglobal(L, "arg");
+ fname = argv[n];
+ if (strcmp(fname, "-") == 0 && strcmp(argv[n-1], "--") != 0)
+ fname = NULL; /* stdin */
+ status = luaL_loadfile(L, fname);
+ lua_insert(L, -(narg+1));
+ if (status == LUA_OK)
+ status = docall(L, narg, LUA_MULTRET);
+ else
+ lua_pop(L, narg);
+ return report(L, status);
+}
+
+
+/* check that argument has no extra characters at the end */
+#define noextrachars(x) {if ((x)[2] != '\0') return -1;}
+
+
+/* indices of various argument indicators in array args */
+#define has_i 0 /* -i */
+#define has_v 1 /* -v */
+#define has_e 2 /* -e */
+#define has_E 3 /* -E */
+
+#define num_has 4 /* number of 'has_*' */
+
+
+static int collectargs (char **argv, int *args) {
+ int i;
+ for (i = 1; argv[i] != NULL; i++) {
+ if (argv[i][0] != '-') /* not an option? */
+ return i;
+ switch (argv[i][1]) { /* option */
+ case '-':
+ noextrachars(argv[i]);
+ return (argv[i+1] != NULL ? i+1 : 0);
+ case '\0':
+ return i;
+ case 'E':
+ args[has_E] = 1;
+ break;
+ case 'i':
+ noextrachars(argv[i]);
+ args[has_i] = 1; /* go through */
+ case 'v':
+ noextrachars(argv[i]);
+ args[has_v] = 1;
+ break;
+ case 'e':
+ args[has_e] = 1; /* go through */
+ case 'l': /* both options need an argument */
+ if (argv[i][2] == '\0') { /* no concatenated argument? */
+ i++; /* try next 'argv' */
+ if (argv[i] == NULL || argv[i][0] == '-')
+ return -(i - 1); /* no next argument or it is another option */
+ }
+ break;
+ default: /* invalid option; return its index... */
+ return -i; /* ...as a negative value */
+ }
+ }
+ return 0;
+}
+
+
+static int runargs (lua_State *L, char **argv, int n) {
+ int i;
+ for (i = 1; i < n; i++) {
+ lua_assert(argv[i][0] == '-');
+ switch (argv[i][1]) { /* option */
+ case 'e': {
+ const char *chunk = argv[i] + 2;
+ if (*chunk == '\0') chunk = argv[++i];
+ lua_assert(chunk != NULL);
+ if (dostring(L, chunk, "=(command line)") != LUA_OK)
+ return 0;
+ break;
+ }
+ case 'l': {
+ const char *filename = argv[i] + 2;
+ if (*filename == '\0') filename = argv[++i];
+ lua_assert(filename != NULL);
+ if (dolibrary(L, filename) != LUA_OK)
+ return 0; /* stop if file fails */
+ break;
+ }
+ default: break;
+ }
+ }
+ return 1;
+}
+
+
+static int handle_luainit (lua_State *L) {
+ const char *name = "=" LUA_INITVERSION;
+ const char *init = getenv(name + 1);
+ if (init == NULL) {
+ name = "=" LUA_INIT;
+ init = getenv(name + 1); /* try alternative name */
+ }
+ if (init == NULL) return LUA_OK;
+ else if (init[0] == '@')
+ return dofile(L, init+1);
+ else
+ return dostring(L, init, name);
+}
+
+
+static int pmain (lua_State *L) {
+ int argc = (int)lua_tointeger(L, 1);
+ char **argv = (char **)lua_touserdata(L, 2);
+ int script;
+ int args[num_has];
+ args[has_i] = args[has_v] = args[has_e] = args[has_E] = 0;
+ if (argv[0] && argv[0][0]) progname = argv[0];
+ script = collectargs(argv, args);
+ if (script < 0) { /* invalid arg? */
+ print_usage(argv[-script]);
+ return 0;
+ }
+ if (args[has_v]) print_version();
+ if (args[has_E]) { /* option '-E'? */
+ lua_pushboolean(L, 1); /* signal for libraries to ignore env. vars. */
+ lua_setfield(L, LUA_REGISTRYINDEX, "LUA_NOENV");
+ }
+ /* open standard libraries */
+ luaL_checkversion(L);
+ lua_gc(L, LUA_GCSTOP, 0); /* stop collector during initialization */
+ luaL_openlibs(L); /* open libraries */
+ lua_gc(L, LUA_GCRESTART, 0);
+ if (!args[has_E] && handle_luainit(L) != LUA_OK)
+ return 0; /* error running LUA_INIT */
+ /* execute arguments -e and -l */
+ if (!runargs(L, argv, (script > 0) ? script : argc)) return 0;
+ /* execute main script (if there is one) */
+ if (script && handle_script(L, argv, script) != LUA_OK) return 0;
+ if (args[has_i]) /* -i option? */
+ dotty(L);
+ else if (script == 0 && !args[has_e] && !args[has_v]) { /* no arguments? */
+ if (lua_stdin_is_tty()) {
+ print_version();
+ dotty(L);
+ }
+ else dofile(L, NULL); /* executes stdin as a file */
+ }
+ lua_pushboolean(L, 1); /* signal no errors */
+ return 1;
+}
+
+
+int main (int argc, char **argv) {
+ int status, result;
+ lua_State *L = luaL_newstate(); /* create state */
+ if (L == NULL) {
+ l_message(argv[0], "cannot create state: not enough memory");
+ return EXIT_FAILURE;
+ }
+ /* call 'pmain' in protected mode */
+ lua_pushcfunction(L, &pmain);
+ lua_pushinteger(L, argc); /* 1st argument */
+ lua_pushlightuserdata(L, argv); /* 2nd argument */
+ status = lua_pcall(L, 2, 1, 0);
+ result = lua_toboolean(L, -1); /* get result */
+ finalreport(L, status);
+ lua_close(L);
+ return (result && status == LUA_OK) ? EXIT_SUCCESS : EXIT_FAILURE;
+}
+
projects / proxmark3-svn / blobdiff