Function readlink_malloc

utils.c:841–862

Sets errno on error (== NULL), * Always ensures terminating zero */

/* Sets errno on error (== NULL),
 * Always ensures terminating zero */
char *
readlink_malloc (const char *pathname)
{
  size_t size = 50;
  ssize_t n;
  cleanup_free char *value = NULL;

  do
    {
      if (size > SIZE_MAX / 2)
        die ("Symbolic link target pathname too long");
      size *= 2;
      value = xrealloc (value, size);
      n = readlink (pathname, value, size - 1);
      if (n < 0)
        return NULL;
    }
  while (size - 2 < (size_t)n);

  value[n] = 0;
  return steal_pointer (&value);
}

char *
get_oldroot_path (const char *path)