1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
4  * Copyright (c) 1999 Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp>
5  * Copyright (c) 1992-1998 Søren Schmidt
26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
78 				= SC_MAX_HISTORY_SIZE - SC_HISTORY_SIZE*MAXCONS;
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()
98 	int delta;				/* lines to put back */  in sc_alloc_history_buffer()
100 	if (lines <= 0)  in sc_alloc_history_buffer()
101 		lines = SC_HISTORY_SIZE;	/* use the default value */  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()
110 	/* calculate the amount of lines to put back to extra_history_size */  in sc_alloc_history_buffer()
116 			delta = cur_lines - min_lines;  in sc_alloc_history_buffer()
119 	/* lines up to min_lines are always allowed. */  in sc_alloc_history_buffer()
120 	min_lines = imax(SC_HISTORY_SIZE, scp->ysize);  in sc_alloc_history_buffer()
121 	if (lines > min_lines) {  in sc_alloc_history_buffer()
122 		if (lines - min_lines > extra_history_size + delta) {  in sc_alloc_history_buffer()
123 			/* too many lines are requested */  in sc_alloc_history_buffer()
124 			scp->history = prev_history;  in sc_alloc_history_buffer()
134 		if (lines > min_lines)  in sc_alloc_history_buffer()
135 			extra_history_size -= lines - min_lines;  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()
164 	int lines;  in copy_history()  local
171 	lines = sc_vtb_rows(from);  in copy_history()
176 	for (i = 0; i < lines; ++i) {  in copy_history()
181 						   cols2 - cols));  in copy_history()
193 	history = scp->history;  in sc_free_history_buffer()
194 	scp->history = NULL;  in sc_free_history_buffer()
201 				  cur_lines - min_lines : 0;  in sc_free_history_buffer()
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()
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()
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()
234 /* copy screen-full of saved lines */
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()
255 	scp->history_pos = sc_vtb_tail(scp->history);  in sc_hist_home()
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()
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()
274 		return -1;  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()
285 	if (scp->history_pos == sc_vtb_tail(scp->history))  in sc_hist_down_line()
286 		return -1;  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()
294 sc_hist_ioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td)  in sc_hist_ioctl()  argument
302 		if (*(int *)data <= 0)  in sc_hist_ioctl()
304 		if (scp->status & BUFFER_SAVED)  in sc_hist_ioctl()
306 		DPRINTF(5, ("lines:%d, ysize:%d, pool:%d\n",  in sc_hist_ioctl()
307 			    *(int *)data, scp->ysize, extra_history_size));  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()
317 		sc_vtb_clear(scp->history, scp->sc->scr_map[0x20],  in sc_hist_ioctl()