rem: format_user (char *buffer, uid_t u)
add: format_user (uid_t u, int width)
context: format_user (char *buffer, uid_t u){  char const *name = (numeric_ids ? NULL : getuser (u));  if (name)    sprintf (buffer, "%-8s ", name);  else    sprintf (buffer, "%-8lu ", (unsigned long) u);  return strlen (buffer);}