82 static void history_to_screen(scr_stat *scp);
86 sc_alloc_history_buffer(scr_stat *scp, int lines, int prev_ysize, int wait)  in sc_alloc_history_buffer()  argument
90 	 * SC_HISTORY_SIZE lines or scp->ysize lines, whichever   in sc_alloc_history_buffer()
104 	lines = imax(lines, scp->ysize);  in sc_alloc_history_buffer()
107 	history = prev_history = scp->history;  in sc_alloc_history_buffer()
108 	scp->history = NULL;  in sc_alloc_history_buffer()
120 	min_lines = imax(SC_HISTORY_SIZE, scp->ysize);  in sc_alloc_history_buffer()
124 			scp->history = prev_history;  in sc_alloc_history_buffer()
137 		sc_vtb_init(history, VTB_RINGBUFFER, scp->xsize, lines,  in sc_alloc_history_buffer()
140 		sc_vtb_clear(history, scp->sc->scr_map[0x20],  in sc_alloc_history_buffer()
144 		scp->history_pos = sc_vtb_tail(history);  in sc_alloc_history_buffer()
146 		scp->history_pos = 0;  in sc_alloc_history_buffer()
156 	scp->history = history;  in sc_alloc_history_buffer()
187 sc_free_history_buffer(scr_stat *scp, int prev_ysize)  in sc_free_history_buffer()  argument
193 	history = scp->history;  in sc_free_history_buffer()
194 	scp->history = NULL;  in sc_free_history_buffer()
209 sc_hist_save(scr_stat *scp)  in sc_hist_save()  argument
211 	sc_vtb_append(&scp->vtb, 0, scp->history, scp->xsize*scp->ysize);  in sc_hist_save()
212 	scp->history_pos = sc_vtb_tail(scp->history);  in sc_hist_save()
217 sc_hist_restore(scr_stat *scp)  in sc_hist_restore()  argument
221 	if (scp->history_pos != sc_vtb_tail(scp->history)) {  in sc_hist_restore()
222 		scp->history_pos = sc_vtb_tail(scp->history);  in sc_hist_restore()
223 		history_to_screen(scp);  in sc_hist_restore()
228 	sc_vtb_seek(scp->history, sc_vtb_pos(scp->history,   in sc_hist_restore()
229 					     sc_vtb_tail(scp->history),  in sc_hist_restore()
230 					     -scp->xsize*scp->ysize));  in sc_hist_restore()
236 history_to_screen(scr_stat *scp)  in history_to_screen()  argument
241 	pos = scp->history_pos;  in history_to_screen()
242 	for (i = 1; i <= scp->ysize; ++i) {  in history_to_screen()
243 		pos = sc_vtb_pos(scp->history, pos, -scp->xsize);  in history_to_screen()
244 		sc_vtb_copy(scp->history, pos,  in history_to_screen()
245 			    &scp->vtb, scp->xsize*(scp->ysize - i),  in history_to_screen()
246 			    scp->xsize);  in history_to_screen()
248 	mark_all(scp);  in history_to_screen()
253 sc_hist_home(scr_stat *scp)  in sc_hist_home()  argument
255 	scp->history_pos = sc_vtb_tail(scp->history);  in sc_hist_home()
256 	history_to_screen(scp);  in sc_hist_home()
261 sc_hist_end(scr_stat *scp)  in sc_hist_end()  argument
263 	scp->history_pos = sc_vtb_pos(scp->history, sc_vtb_tail(scp->history),  in sc_hist_end()
264 				      scp->xsize*scp->ysize);  in sc_hist_end()
265 	history_to_screen(scp);  in sc_hist_end()
270 sc_hist_up_line(scr_stat *scp)  in sc_hist_up_line()  argument
272 	if (sc_vtb_pos(scp->history, scp->history_pos, -(scp->xsize*scp->ysize))  in sc_hist_up_line()
273 	    == sc_vtb_tail(scp->history))  in sc_hist_up_line()
275 	scp->history_pos = sc_vtb_pos(scp->history, scp->history_pos,  in sc_hist_up_line()
276 				      -scp->xsize);  in sc_hist_up_line()
277 	history_to_screen(scp);  in sc_hist_up_line()
283 sc_hist_down_line(scr_stat *scp)  in sc_hist_down_line()  argument
285 	if (scp->history_pos == sc_vtb_tail(scp->history))  in sc_hist_down_line()
287 	scp->history_pos = sc_vtb_pos(scp->history, scp->history_pos,  in sc_hist_down_line()
288 				      scp->xsize);  in sc_hist_down_line()
289 	history_to_screen(scp);  in sc_hist_down_line()
296 	scr_stat *scp;  in sc_hist_ioctl()  local
301 		scp = SC_STAT(tp);  in sc_hist_ioctl()
304 		if (scp->status & BUFFER_SAVED)  in sc_hist_ioctl()
307 			    *(int *)data, scp->ysize, extra_history_size));  in sc_hist_ioctl()
308 		error = sc_alloc_history_buffer(scp,   in sc_hist_ioctl()
309 					       imax(*(int *)data, scp->ysize),  in sc_hist_ioctl()
310 					       scp->ysize, TRUE);  in sc_hist_ioctl()
312 			    sc_vtb_rows(scp->history), extra_history_size));  in sc_hist_ioctl()
316 		scp = SC_STAT(tp);  in sc_hist_ioctl()
317 		sc_vtb_clear(scp->history, scp->sc->scr_map[0x20],  in sc_hist_ioctl()