rem: sprintf (comment, "%s%.*s", _("id="), (int) sizeof UT_ID (utmp_ent), UT_ID (utmp_ent));
add: strcpy (comment, _("id=")); strncat (comment, UT_ID (utmp_ent), sizeof UT_ID (utmp_ent));
context: make_id_equals_comment (STRUCT_UTMP const *utmp_ent){  char *comment = xmalloc (strlen (_("id=")) + sizeof UT_ID (utmp_ent) + 1);  /* Cast field width argument to `int' to avoid warning from gcc.  */  sprintf (comment, "%s%.*s", _("id="), (int) sizeof UT_ID (utmp_ent),	   UT_ID (utmp_ent));  return comment;}