writeit
int (*writeit)(void *, void *, int);
int (*writeit)(void *, void *, int))
rstrm->writeit = writeit;
if ((*(rstrm->writeit))(rstrm->tcp_handle, rstrm->out_base, (int)len)
size = writeit(file, &dp, n - 4, pf->f_convert);
size = writeit(file, &dp, n - 4, convert);
int writeit(FILE *, struct tftphdr **, int, int);
writeit(argv[optind], argv[optind + 1], argv[optind + 2],
static void writeit(const char *, const char *, const char *, int);