588     Char  *ofd, *ols, *oe, *nfd, *nls, *ne;  in update_line()  local
598     nfd = n;  in update_line()
623     while (nfd < n) {  in update_line()
635     if (*ofd == '\0' && *nfd == '\0') {  in update_line()
645     while ((o > ofd) && (n > nfd) && (*--o == *--n))  in update_line()
670 	for (c = *ofd, n = nfd; n < nls; n++) {  in update_line()
678 		if (((nse - nsb) < (p - n)) && (2 * (p - n) > n - nfd)) {  in update_line()
691     if (*nfd) {  in update_line()
692 	for (c = *nfd, o = ofd; o < ols; o++) {  in update_line()
694 		for (n = nfd, p = o; p < ols && n < nls && *p == *n; p++, n++)  in update_line()
701 		    nsb = nfd;  in update_line()
737     fx = (int) ((nsb - nfd) - (osb - ofd));  in update_line()
755 	if ((ols - ofd) < (nls - nfd)) {  in update_line()
771 	if ((ols - ofd) > (nls - nfd)) {  in update_line()
793     fx = (int) ((nsb - nfd) - (osb - ofd));  in update_line()
801 	    nfd - new, nsb - new, nse - new, nls - new, ne - new);  in update_line()
807     dprintstr("new-nfd", new, nfd);  in update_line()
809     dprintstr("nfd-nsb", nfd, nsb);  in update_line()
864     if ((nsb != nfd) && fx > 0 && ((p - old) + fx < TermH)) {  in update_line()
866 	reprintf("first diff insert at %d...\r\n", nfd - new);  in update_line()
871 	MoveToChar(nfd - new);  in update_line()
887 		Insert_write(nfd, fx);  in update_line()
888 		str_insert(old, (int) (ofd - old), TermH, nfd, fx);  in update_line()
893 	    so_write(nfd + fx, (nsb - nfd) - fx);  in update_line()
894 	    str_cp(ofd + fx, nfd + fx, (int) ((nsb - nfd) - fx));  in update_line()
900 	    so_write(nfd, (nsb - nfd));  in update_line()
901 	    str_cp(ofd, nfd, (int) (nsb - nfd));  in update_line()
938 	    so_write(nfd, (nsb - nfd));  in update_line()
939 	    str_cp(ofd, nfd, (int) (nsb - nfd));  in update_line()
949 	    so_write(nfd, (nsb - nfd));  in update_line()
1030     if ((nsb != nfd) && (osb - ofd) <= (nsb - nfd) && (fx == 0)) {  in update_line()
1032 	reprintf("late first diff insert at %d...\r\n", nfd - new);  in update_line()
1035 	MoveToChar(nfd - new);  in update_line()
1048 	    fx = (int) ((nsb - nfd) - (osb - ofd));  in update_line()
1057 		Insert_write(nfd, fx);  in update_line()
1058 		str_insert(old, (int) (ofd - old), TermH, nfd, fx);  in update_line()
1064 	    so_write(nfd + fx, (nsb - nfd) - fx);  in update_line()
1065 	    str_cp(ofd + fx, nfd + fx, (int) ((nsb - nfd) - fx));  in update_line()
1071 	    so_write(nfd, (nsb - nfd));  in update_line()
1072 	    str_cp(ofd, nfd, (int) (nsb - nfd));  in update_line()