liolib.c

Lua 语言解释器源码

      }
      else {
        const char *p = lua_tostring(L, n);
        luaL_argcheck(L, p && p[0] == '*', n, "invalid option");
        switch (p[1]) {
          case 'n':  /* number */
            success = read_number(L, f);
            break;
          case 'l':  /* line */
            success = read_line(L, f);
            break;
          case 'a':  /* file */
            read_chars(L, f, ~((size_t)0));  /* read MAX_SIZE_T chars */
            success = 1; /* always success */
            break;
          case 'w':  /* word */
            return luaL_error(L, "obsolete option `*w' to `read'");
          default:
            return luaL_argerror(L, n, "invalid format");
        }
      }
    }
  }
  if (!success) {
    lua_pop(L, 1);  /* remove last result */
    lua_pushnil(L);  /* push nil instead */
  }
  return n - first;
}


static int io_read (lua_State *L) {
  return g_read(L, getiofile(L, IO_INPUT), 1);
}


static int f_read (lua_State *L) {
  return g_read(L, tofile(L, 1), 2);
}


static int io_readline (lua_State *L) {
  FILE *f = *(FILE **)lua_touserdata(L, lua_upvalueindex(2));
  if (f == NULL)  /* file is already closed? */
    luaL_error(L, "file is already closed");
  if (read_line(L, f)) return 1;
  else {  /* EOF */
    if (lua_toboolean(L, lua_upvalueindex(3))) {  /* generator created file? */
      lua_settop(L, 0);
      lua_pushvalue(L, lua_upvalueindex(2));
      aux_close(L);  /* close it */
    }
    return 0;
  }
}

/* }====================================================== */


static int g_write (lua_State *L, FILE *f, int arg) {
  int nargs = lua_gettop(L) - 1;
  int status = 1;
  for (; nargs--; arg++) {
    if (lua_type(L, arg) == LUA_TNUMBER) {
      /* optimization: could be done exactly as for strings */
      status = status &&
          fprintf(f, LUA_NUMBER_FMT, lua_tonumber(L, arg)) > 0;
    }
    else {
      size_t l;
      const char *s = luaL_checklstring(L, arg, &l);
      status = status && (fwrite(s, sizeof(char), l, f) == l);
    }
  }
  return pushresult(L, status, NULL);
}


static int io_write (lua_State *L) {
  return g_write(L, getiofile(L, IO_OUTPUT), 1);
}


static int f_write (lua_State *L) {
  return g_write(L, tofile(L, 1), 2);
}


static int f_seek (lua_State *L) {
  static const int mode[] = {SEEK_SET, SEEK_CUR, SEEK_END};
  static const char *const modenames[] = {"set", "cur", "end", NULL};
  FILE *f = tofile(L, 1);
  int op = luaL_findstring(luaL_optstring(L, 2, "cur"), modenames);
  long offset = luaL_optlong(L, 3, 0);
  luaL_argcheck(L, op != -1, 2, "invalid mode");
  op = fseek(f, offset, mode[op]);
  if (op)
    return pushresult(L, 0, NULL);  /* error */
  else {
    lua_pushnumber(L, ftell(f));
    return 1;
  }
}


static int io_flush (lua_State *L) {
  return pushresult(L, fflush(getiofile(L, IO_OUTPUT)) == 0, NULL);
}


static int f_flush (lua_State *L) {
  return pushresult(L, fflush(tofile(L, 1)) == 0, NULL);
}


static const luaL_reg iolib[] = {
  {"input", io_input},
  {"output", io_output},
  {"lines", io_lines},
  {"close", io_close},
  {"flush", io_flush},
  {"open", io_open},
  {"popen", io_popen},
  {"read", io_read},
  {"tmpfile", io_tmpfile},
  {"type", io_type},
  {"write", io_write},
  {NULL, NULL}
};


static const luaL_reg flib[] = {
  {"flush", f_flush},
  {"read", f_read},
  {"lines", f_lines},
  {"seek", f_seek},
  {"write", f_write},
  {"close", io_close},
  {"__gc", io_gc},
  {"__tostring", io_tostring},
  {NULL, NULL}
};


static void createmeta (lua_State *L) {
  luaL_newmetatable(L, FILEHANDLE);  /* create new metatable for file handles */
  /* file methods */
  lua_pushliteral(L, "__index");
  lua_pushvalue(L, -2);  /* push metatable */
  lua_rawset(L, -3);  /* metatable.__index = metatable */
  luaL_openlib(L, NULL, flib, 0);
}

/* }====================================================== */


/*
** {======================================================
** Other O.S. Operations
** =======================================================
*/

static int io_execute (lua_State *L) {
  lua_pushnumber(L, system(luaL_checkstring(L, 1)));
  return 1;
}


static int io_remove (lua_State *L) {
  const char *filename = luaL_checkstring(L, 1);
  return pushresult(L, remove(filename) == 0, filename);
}


static int io_rename (lua_State *L) {
  const char *fromname = luaL_checkstring(L, 1);
  const char *toname = luaL_checkstring(L, 2);
  return pushresult(L, rename(fromname, toname) == 0, fromname);
}


static int io_tmpname (lua_State *L) {
#if !USE_TMPNAME
  luaL_error(L, "`tmpname' not supported");
  return 0;
#else
  char buff[L_tmpnam];
  if (tmpnam(buff) != buff)
    return luaL_error(L, "unable to generate a unique filename in `tmpname'");
  lua_pushstring(L, buff);
  return 1;
#endif
}


static int io_getenv (lua_State *L) {
  lua_pushstring(L, getenv(luaL_checkstring(L, 1)));  /* if NULL push nil */
  return 1;
}


static int io_clock (lua_State *L) {
  lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC);
  return 1;
}


/*
** {======================================================
** Time/Date operations
** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S,
**   wday=%w+1, yday=%j, isdst=? }
** =======================================================
*/

static void setfield (lua_State *L, const char *key, int value) {
  lua_pushstring(L, key);
  lua_pushnumber(L, value);
  lua_rawset(L, -3);
}

static void setboolfield (lua_State *L, const char *key, int value) {
  lua_pushstring(L, key);
  lua_pushboolean(L, value);
  lua_rawset(L, -3);
}

static int getboolfield (lua_State *L, const char *key) {
  int res;
  lua_pushstring(L, key);
  lua_gettable(L, -2);
  res = lua_toboolean(L, -1);
  lua_pop(L, 1);
  return res;
}


static int getfield (lua_State *L, const char *key, int d) {
  int res;
  lua_pushstring(L, key);
  lua_gettable(L, -2);
  if (lua_isnumber(L, -1))
    res = (int)(lua_tonumber(L, -1));
  else {
    if (d == -2)
      return luaL_error(L, "field `%s' missing in date table", key);
    res = d;
  }
  lua_pop(L, 1);
  return res;
}


static int io_date (lua_State *L) {
  const char *s = luaL_optstring(L, 1, "%c");
  time_t t = (time_t)(luaL_optnumber(L, 2, -1));
  struct tm *stm;
  if (t == (time_t)(-1))  /* no time given? */
    t = time(NULL);  /* use current time */
  if (*s == '!') {  /* UTC? */
    stm = gmtime(&t);
    s++;  /* skip `!' */
  }
  else
    stm = localtime(&t);
  if (stm == NULL)  /* invalid date? */
    lua_pushnil(L);
  else if (strcmp(s, "*t") == 0) {
    lua_newtable(L);
    setfield(L, "sec", stm->tm_sec);
    setfield(L, "min", stm->tm_min);
    setfield(L, "hour", stm->tm_hour);
    setfield(L, "day", stm->tm_mday);
    setfield(L, "month", stm->tm_mon+1);
    setfield(L, "year", stm->tm_year+1900);
    setfield(L, "wday", stm->tm_wday+1);
    setfield(L, "yday", stm->tm_yday+1);
    setboolfield(L, "isdst", stm->tm_isdst);
  }
  else {
    char b[256];
    if (strftime(b, sizeof(b), s, stm))
      lua_pushstring(L, b);
    else
      return luaL_error(L, "`date' format too long");
  }
  return 1;
}


static int io_time (lua_State *L) {
  if (lua_isnoneornil(L, 1))  /* called without args? */
    lua_pushnumber(L, time(NULL));  /* return current time */
  else {
    time_t t;
    struct tm ts;
    luaL_checktype(L, 1, LUA_TTABLE);
    lua_settop(L, 1);  /* make sure table is at the top */
    ts.tm_sec = getfield(L, "sec", 0);
    ts.tm_min = getfield(L, "min", 0);
    ts.tm_hour = getfield(L, "hour", 12);
    ts.tm_mday = getfield(L, "day", -2);
    ts.tm_mon = getfield(L, "month", -2) - 1;
    ts.tm_year = getfield(L, "year", -2) - 1900;
    ts.tm_isdst = getboolfield(L, "isdst");
    t = mktime(&ts);
    if (t == (time_t)(-1))
      lua_pushnil(L);
    else
      lua_pushnumber(L, t);
  }
  return 1;
}


static int io_difftime (lua_State *L) {
  lua_pushnumber(L, difftime((time_t)(luaL_checknumber(L, 1)),
                             (time_t)(luaL_optnumber(L, 2, 0))));
  return 1;
}

/* }====================================================== */


static int io_setloc (lua_State *L) {
  static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY,
                      LC_NUMERIC, LC_TIME};
  static const char *const catnames[] = {"all", "collate", "ctype", "monetary",
     "numeric", "time", NULL};
  const char *l = lua_tostring(L, 1);
  int op = luaL_findstring(luaL_optstring(L, 2, "all"), catnames);
  luaL_argcheck(L, l || lua_isnoneornil(L, 1), 1, "string expected");
  luaL_argcheck(L, op != -1, 2, "invalid option");
  lua_pushstring(L, setlocale(cat[op], l));
  return 1;
}


static int io_exit (lua_State *L) {
  exit(luaL_optint(L, 1, EXIT_SUCCESS));
  return 0;  /* to avoid warnings */
}

static const luaL_reg syslib[] = {
  {"clock",     io_clock},
  {"date",      io_date},
  {"difftime",  io_difftime},
  {"execute",   io_execute},
  {"exit",      io_exit},
  {"getenv",    io_getenv},
  {"remove",    io_remove},
  {"rename",    io_rename},
  {"setlocale", io_setloc},
  {"time",      io_time},
  {"tmpname",   io_tmpname},
  {NULL, NULL}
};

/* }====================================================== */



LUALIB_API int luaopen_io (lua_State *L) {
  luaL_openlib(L, LUA_OSLIBNAME, syslib, 0);
  createmeta(L);
  lua_pushvalue(L, -1);
  luaL_openlib(L, LUA_IOLIBNAME, iolib, 1);
  /* put predefined file handles into `io' table */
  registerfile(L, stdin, "stdin", IO_INPUT);
  registerfile(L, stdout, "stdout", IO_OUTPUT);
  registerfile(L, stderr, "stderr", NULL);
  return 1;
}