+#ifdef lint
+ s = 0; /* define it before possible use */
+#endif
+ if (hascursor = w->ww_hascursor)
+ wwcursor(w, 0);
+ while (p < q && !w->ww_stopped && (!wwinterrupt() || w->ww_nointr)) {
+ if (r && !*p) {
+ p = r;
+ q = s;
+ r = 0;
+ continue;
+ }
+ if (w->ww_wstate == 0 &&
+ (isprt(*p) || w->ww_unctrl && isunctrl(*p))) {
+ register i;
+ register union ww_char *bp;
+ int col, col1;
+
+ if (w->ww_insert) { /* this is very slow */
+ if (*p == '\t') {
+ p++;
+ w->ww_cur.c += 8 -
+ (w->ww_cur.c - w->ww_w.l & 7);
+ goto chklf;
+ }
+ if (!isprt(*p)) {
+ r = p + 1;
+ s = q;
+ p = unctrl(*p);
+ q = p + 10;
+ }
+ wwinschar(w, w->ww_cur.r, w->ww_cur.c,
+ *p++, w->ww_modes);
+ goto right;
+ }
+
+ bp = &w->ww_buf[w->ww_cur.r][w->ww_cur.c];
+ i = w->ww_cur.c;
+ while (i < w->ww_w.r && p < q)
+ if (!*p && r) {
+ p = r;
+ q = s;
+ r = 0;
+ } else if (*p == '\t') {
+ register tmp = 8 - (i - w->ww_w.l & 7);
+ p++;
+ i += tmp;
+ bp += tmp;
+ } else if (isprt(*p)) {
+ bp++->c_w = *p++
+ | w->ww_modes << WWC_MSHIFT;
+ i++;
+ } else if (w->ww_unctrl && isunctrl(*p)) {
+ r = p + 1;
+ s = q;
+ p = unctrl(*p);
+ q = p + 10;
+ } else
+ break;
+ col = MAX(w->ww_cur.c, w->ww_i.l);
+ col1 = MIN(i, w->ww_i.r);
+ w->ww_cur.c = i;
+ if (w->ww_cur.r >= w->ww_i.t
+ && w->ww_cur.r < w->ww_i.b) {
+ register union ww_char *ns = wwns[w->ww_cur.r];
+ register char *smap = &wwsmap[w->ww_cur.r][col];
+ register char *win = w->ww_win[w->ww_cur.r];
+ int nchanged = 0;
+
+ bp = w->ww_buf[w->ww_cur.r];
+ for (i = col; i < col1; i++)
+ if (*smap++ == w->ww_index) {
+ nchanged++;
+ ns[i].c_w = bp[i].c_w
+ ^ win[i] << WWC_MSHIFT;
+ }
+ if (nchanged > 0)
+ wwtouched[w->ww_cur.r] |= WWU_TOUCHED;