Function readable

3rdparty/luajit/src/lib_package.c:297–303

/* ------------------------------------------------------------------------ */

static int readable(const char *filename)
{
  FILE *f = fopen(filename, "r");  /* try to open file */
  if (f == NULL) return 0;  /* open failed */
  fclose(f);
  return 1;
}

static const char *pushnexttemplate(lua_State *L, const char *path)
{