


const char *progname = "luajit";
void l_message(const char *pname, const char *msg);









static void print_usage(void)
{
  fprintf(stderr,
  "usage: %s [options]... [script [args]...].\n"
  "Available options are:\n"
  "  -e chunk  Execute string " LUA_QL("chunk") ".\n"
  "  -l name   Require library " LUA_QL("name") ".\n"
  "  -b ...    Save or list bytecode.\n"
  "  -j cmd    Perform LuaJIT control command.\n"
  "  -O[opt]   Control LuaJIT optimizations.\n"
  "  -i        Enter interactive mode after executing " LUA_QL("script") ".\n"
  "  -v        Show version information.\n"
  "  --        Stop handling options.\n"
  "  -         Execute stdin and stop handling options.\n"
  ,
  progname);
  fflush(stderr);
}


static void print_version(void)
{
  fprintf(stderr,
    LUAJIT_VERSION " -- " LUAJIT_COPYRIGHT ". " LUAJIT_URL "\n");
}

static void print_jit_status(lua_State *L)
{
  int n;
  const char *s;
  lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
  lua_getfield(L, -1, "jit");  /* Get jit.* module table. */
  lua_remove(L, -2);
  lua_getfield(L, -1, "status");
  lua_remove(L, -2);
  n = lua_gettop(L);
  lua_call(L, 0, LUA_MULTRET);
  fputs(lua_toboolean(L, n) ? "JIT: ON" : "JIT: OFF", stderr);
  for (n++; (s = lua_tostring(L, n)); n++)
    fprintf(stderr, " %s", s);
  fputs("\n", stderr);
}

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) || docall(L, 0, 1);
  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) || docall(L, 0, 1);
  return report(L, status);
}

static int dolibrary(lua_State *L, const char *name)
{
  lua_getglobal(L, "require");
  lua_pushstring(L, name);
  return report(L, docall(L, 1, 1));
}

static void write_prompt(lua_State *L, int firstline)
{
  const char *p;
  lua_getfield(L, LUA_GLOBALSINDEX, firstline ? "_PROMPT" : "_PROMPT2");
  p = lua_tostring(L, -1);
  if (p == NULL) p = firstline ? LUA_PROMPT : LUA_PROMPT2;
  fputs(p, stdout);
  fflush(stdout);
  lua_pop(L, 1);  /* remove global */
}

static int incomplete(lua_State *L, int status)
{
  if (status == LUA_ERRSYNTAX) {
    size_t lmsg;
    const char *msg = lua_tolstring(L, -1, &lmsg);
    const char *tp = msg + lmsg - (sizeof(LUA_QL("<eof>")) - 1);
    if (strstr(msg, LUA_QL("<eof>")) == tp) {
      lua_pop(L, 1);
      return 1;
    }
  }
  return 0;  /* else... */
}

static int pushline(lua_State *L, int firstline)
{
  char buf[LUA_MAXINPUT];
  write_prompt(L, firstline);
  if (fgets(buf, LUA_MAXINPUT, stdin)) {
    size_t len = strlen(buf);
    if (len > 0 && buf[len-1] == '\n')
      buf[len-1] = '\0';
    if (firstline && buf[0] == '=')
      lua_pushfstring(L, "return %s", buf+1);
    else
      lua_pushstring(L, buf);
    return 1;
  }
  return 0;
}

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 */
    status = luaL_loadbuffer(L, lua_tostring(L, 1), lua_strlen(L, 1), "=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_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 == 0) status = docall(L, 0, 0);
    report(L, status);
    if (status == 0 && lua_gettop(L) > 0) {  /* any result to print? */
      lua_getglobal(L, "print");
      lua_insert(L, 1);
      if (lua_pcall(L, lua_gettop(L)-1, 0, 0) != 0)
	l_message(progname,
	  lua_pushfstring(L, "error calling " LUA_QL("print") " (%s)",
			      lua_tostring(L, -1)));
    }
  }
  lua_settop(L, 0);  /* clear stack */
  fputs("\n", stdout);
  fflush(stdout);
  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 == 0)
    status = docall(L, narg, 0);
  else
    lua_pop(L, narg);
  return report(L, status);
}

/* Load add-on module. */
static int loadjitmodule(lua_State *L)
{
  lua_getglobal(L, "require");
  lua_pushliteral(L, "jit.");
  lua_pushvalue(L, -3);
  lua_concat(L, 2);
  if (lua_pcall(L, 1, 1, 0)) {
    const char *msg = lua_tostring(L, -1);
    if (msg && !strncmp(msg, "module ", 7)) {
    err:
      l_message(progname,
		"unknown luaJIT command or jit.* modules not installed");
      return 1;
    } else {
      return report(L, 1);
    }
  }
  lua_getfield(L, -1, "start");
  if (lua_isnil(L, -1)) goto err;
  lua_remove(L, -2);  /* Drop module table. */
  return 0;
}

/* Run command with options. */
static int runcmdopt(lua_State *L, const char *opt)
{
  int narg = 0;
  if (opt && *opt) {
    for (;;) {  /* Split arguments. */
      const char *p = strchr(opt, ',');
      narg++;
      if (!p) break;
      if (p == opt)
	lua_pushnil(L);
      else
	lua_pushlstring(L, opt, (size_t)(p - opt));
      opt = p + 1;
    }
    if (*opt)
      lua_pushstring(L, opt);
    else
      lua_pushnil(L);
  }
  return report(L, lua_pcall(L, narg, 0, 0));
}

/* JIT engine control command: try jit library first or load add-on module. */
static int dojitcmd(lua_State *L, const char *cmd)
{
  const char *opt = strchr(cmd, '=');
  lua_pushlstring(L, cmd, opt ? (size_t)(opt - cmd) : strlen(cmd));
  lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
  lua_getfield(L, -1, "jit");  /* Get jit.* module table. */
  lua_remove(L, -2);
  lua_pushvalue(L, -2);
  lua_gettable(L, -2);  /* Lookup library function. */
  if (!lua_isfunction(L, -1)) {
    lua_pop(L, 2);  /* Drop non-function and jit.* table, keep module name. */
    if (loadjitmodule(L))
      return 1;
  } else {
    lua_remove(L, -2);  /* Drop jit.* table. */
  }
  lua_remove(L, -2);  /* Drop module name. */
  return runcmdopt(L, opt ? opt+1 : opt);
}

/* Optimization flags. */
static int dojitopt(lua_State *L, const char *opt)
{
  lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
  lua_getfield(L, -1, "jit.opt");  /* Get jit.opt.* module table. */
  lua_remove(L, -2);
  lua_getfield(L, -1, "start");
  lua_remove(L, -2);
  return runcmdopt(L, opt);
}

/* Save or list bytecode. */
static int dobytecode(lua_State *L, char **argv)
{
  int narg = 0;
  lua_pushliteral(L, "bcsave");
  if (loadjitmodule(L))
    return 1;
  if (argv[0][2]) {
    narg++;
    argv[0][1] = '-';
    lua_pushstring(L, argv[0]+1);
  }
  for (argv++; *argv != NULL; narg++, argv++)
    lua_pushstring(L, *argv);
  return report(L, lua_pcall(L, narg, 0, 0));
}

/* check that argument has no extra characters at the end */
#define notail(x)	{if ((x)[2] != '\0') return -1;}

#define FLAGS_INTERACTIVE	1
#define FLAGS_VERSION		2
#define FLAGS_EXEC		4
#define FLAGS_OPTION		8

static int collectargs(char **argv, int *flags)
{
  int i;
  for (i = 1; argv[i] != NULL; i++) {
    if (argv[i][0] != '-')  /* Not an option? */
      return i;
    switch (argv[i][1]) {  /* Check option. */
    case '-':
      notail(argv[i]);
      return (argv[i+1] != NULL ? i+1 : 0);
    case '\0':
      return i;
    case 'i':
      notail(argv[i]);
      *flags |= FLAGS_INTERACTIVE;
      /* fallthrough */
    case 'v':
      notail(argv[i]);
      *flags |= FLAGS_VERSION;
      break;
    case 'e':
      *flags |= FLAGS_EXEC;
    case 'j':  /* LuaJIT extension */
    case 'l':
      *flags |= FLAGS_OPTION;
      if (argv[i][2] == '\0') {
	i++;
	if (argv[i] == NULL) return -1;
      }
      break;
    case 'O': break;  /* LuaJIT extension */
    case 'b':  /* LuaJIT extension */
      if (*flags) return -1;
      *flags |= FLAGS_EXEC;
      return 0;
    default: return -1;  /* invalid option */
    }
  }
  return 0;
}

static int runargs(lua_State *L, char **argv, int n)
{
  int i;
  for (i = 1; i < n; i++) {
    if (argv[i] == NULL) continue;
    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)") != 0)
	return 1;
      break;
      }
    case 'l': {
      const char *filename = argv[i] + 2;
      if (*filename == '\0') filename = argv[++i];
      lua_assert(filename != NULL);
      if (dolibrary(L, filename))
	return 1;  /* stop if file fails */
      break;
      }
    case 'j': {  /* LuaJIT extension */
      const char *cmd = argv[i] + 2;
      if (*cmd == '\0') cmd = argv[++i];
      lua_assert(cmd != NULL);
      if (dojitcmd(L, cmd))
	return 1;
      break;
      }
    case 'O':  /* LuaJIT extension */
      if (dojitopt(L, argv[i] + 2))
	return 1;
      break;
    case 'b':  /* LuaJIT extension */
      return dobytecode(L, argv+i);
    default: break;
    }
  }
  return 0;
}

static int handle_luainit(lua_State *L)
{
  const char *init = getenv(LUA_INIT);
  if (init == NULL)
    return 0;  /* status OK */
  else if (init[0] == '@')
    return dofile(L, init+1);
  else
    return dostring(L, init, "=" LUA_INIT);
}

struct Smain {
  char **argv;
  int argc;
  int status;
};

static int pmain(lua_State *L)
{
  struct Smain *s = (struct Smain *)lua_touserdata(L, 1);
  char **argv = s->argv;
  int script;
  int flags = 0;
  curent_lstate = L;
  if (argv[0] && argv[0][0]) progname = argv[0];
  LUAJIT_VERSION_SYM();  /* linker-enforced version check */
  lua_gc(L, LUA_GCSTOP, 0);  /* stop collector during initialization */
  luaL_openlibs(L);  /* open libraries */
  lua_gc(L, LUA_GCRESTART, -1);
  s->status = handle_luainit(L);
  if (s->status != 0) return 0;
  script = collectargs(argv, &flags);
  if (script < 0) {  /* invalid args? */
    print_usage();
    s->status = 1;
    return 0;
  }
  if ((flags & FLAGS_VERSION)) print_version();
  s->status = runargs(L, argv, (script > 0) ? script : s->argc);
  if (s->status != 0) return 0;
  if (script)
    s->status = handle_script(L, argv, script);
  if (s->status != 0) return 0;
  if ((flags & FLAGS_INTERACTIVE)) {
    print_jit_status(L);
    dotty(L);
  } else if (script == 0 && !(flags & (FLAGS_EXEC|FLAGS_VERSION))) {

      dofile(L, NULL);  /* executes stdin as a file */

  }
  return 0;
}
