readtty
char *readtty(const char *, char *);
extract(readtty("To: ", detract(hp->h_to, 0)), GTO);
hp->h_subject = readtty("Subject: ", hp->h_subject);
extract(readtty("Cc: ", detract(hp->h_cc, 0)), GCC);
extract(readtty("Bcc: ", detract(hp->h_bcc, 0)), GBCC);
return (readtty(pr, cp));