goto error;
{ rpath[0] = '\0'; goto error; }
canonicalize (const char *name, char *resolved){  char *rpath, *dest, *extra_buf = NULL;  const char *start, *end, *rpath_limit;  long int path_max;  int num_links = 0;  if (name == NULL)    {      /* As per Single Unix Specification V2 we must return an error if	 either parameter is a null pointer.  We extend this to allow	 the RESOLVED parameter be NULL in case the we are expected to	 allocate the room for the return value.  */      __set_errno (EINVAL);      return NULL;    }  if (name[0] == '\0')    {      /* As per Single Unix Specification V2 we must return an error if	 the name argument points to an empty string.  */      __set_errno (ENOENT);      return NULL;    }#ifdef PATH_MAX  path_max = PATH_MAX;#else  path_max = pathconf (name, _PC_PATH_MAX);  if (path_max <= 0)    path_max = 1024;#endif  rpath = resolved ? __alloca (path_max) : malloc (path_max);  rpath_limit = rpath + path_max;  if (name[0] != '/')    {      if (!__getcwd (rpath, path_max))	goto error;      dest = strchr (rpath, '\0');    }  else    {      rpath[0] = '/';      dest = rpath + 1;    }  for (start = end = name; *start; start = end)    {      struct stat st;      int n;      /* Skip sequence of multiple path-separators.  */      while (*start == '/')	++start;      /* Find end of path component.  */      for (end = start; *end && *end != '/'; ++end)	/* Nothing.  */;      if (end - start == 0)	break;      else if (end - start == 1 && start[0] == '.')	/* nothing */;      else if (end - start == 2 && start[0] == '.' && start[1] == '.')	{	  /* Back up to previous component, ignore if at root already.  */	  if (dest > rpath + 1)	    while ((--dest)[-1] != '/');	}      else	{	  size_t new_size;	  if (dest[-1] != '/')	    *dest++ = '/';	  if (dest + (end - start) >= rpath_limit)	    {	      ptrdiff_t dest_offset = dest - rpath;	      if (resolved)		{		  __set_errno (ENAMETOOLONG);		  goto error;		}	      new_size = rpath_limit - rpath;	      if (end - start + 1 > path_max)		new_size += end - start + 1;	      else		new_size += path_max;	      rpath = realloc (rpath, new_size);	      rpath_limit = rpath + new_size;	      if (rpath == NULL)		return NULL;	      dest = rpath + dest_offset;	    }	  dest = __mempcpy (dest, start, end - start);	  *dest = '\0';	  if (__lxstat (_STAT_VER, rpath, &st) < 0)	    goto error;	  if (S_ISLNK (st.st_mode))	    {	      char *buf = __alloca (path_max);	      size_t len;	      if (++num_links > MAXSYMLINKS)		{		  __set_errno (ELOOP);		  goto error;		}	      n = __readlink (rpath, buf, path_max);	      if (n < 0)		goto error;	      buf[n] = '\0';	      if (!extra_buf)		extra_buf = __alloca (path_max);	      len = strlen (end);	      if ((long int) (n + len) >= path_max)		{		  __set_errno (ENAMETOOLONG);		  goto error;		}	      /* Careful here, end may be a pointer into extra_buf... */	      memmove (&extra_buf[n], end, len + 1);	      name = end = memcpy (extra_buf, buf, n);	      if (buf[0] == '/')		dest = rpath + 1;	/* It's an absolute symlink */	      else		/* Back up to previous component, ignore if at root already: */		if (dest > rpath + 1)		  while ((--dest)[-1] != '/');	    }	}    }  if (dest > rpath + 1 && dest[-1] == '/')    --dest;  *dest = '\0';  return resolved ? memcpy (resolved, rpath, dest - rpath + 1) : rpath;error:  if (resolved)    strcpy (resolved, rpath);  else    free (rpath);  return NULL;}