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273 lines
7.1 KiB
C
273 lines
7.1 KiB
C
/*-
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* Copyright (c) 1999 Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp>
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* Copyright (c) 1992-1998 Søren Schmidt
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer,
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* without modification, immediately at the beginning of the file.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include "sc.h"
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#include "opt_syscons.h"
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#if NSC > 0
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#ifndef SC_NO_HISTORY
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/tty.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <machine/console.h>
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#include <dev/syscons/syscons.h>
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#if !defined(SC_MAX_HISTORY_SIZE)
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#define SC_MAX_HISTORY_SIZE (1000 * MAXCONS * NSC)
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#endif
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#if !defined(SC_HISTORY_SIZE)
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#define SC_HISTORY_SIZE (ROW * 4)
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#endif
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#if (SC_HISTORY_SIZE * MAXCONS * NSC) > SC_MAX_HISTORY_SIZE
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#undef SC_MAX_HISTORY_SIZE
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#define SC_MAX_HISTORY_SIZE (SC_HISTORY_SIZE * MAXCONS * NSC)
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#endif
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/* local variables */
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static int extra_history_size
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= SC_MAX_HISTORY_SIZE - SC_HISTORY_SIZE*MAXCONS;
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/* local functions */
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static void history_to_screen(scr_stat *scp);
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/* allocate a history buffer */
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int
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sc_alloc_history_buffer(scr_stat *scp, int lines, int prev_ysize, int wait)
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{
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/*
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* syscons unconditionally allocates buffers upto
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* SC_HISTORY_SIZE lines or scp->ysize lines, whichever
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* is larger. A value greater than that is allowed,
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* subject to extra_history_size.
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*/
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sc_vtb_t *history;
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sc_vtb_t *prev_history;
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int cur_lines; /* current buffer size */
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int min_lines; /* guaranteed buffer size */
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int delta; /* lines to put back */
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if (lines <= 0)
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lines = SC_HISTORY_SIZE; /* use the default value */
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/* make it at least as large as the screen size */
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lines = imax(lines, scp->ysize);
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/* remove the history buffer while we update it */
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history = prev_history = scp->history;
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scp->history = NULL;
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/* calculate the amount of lines to put back to extra_history_size */
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delta = 0;
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if (prev_history) {
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cur_lines = sc_vtb_rows(history);
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min_lines = imax(SC_HISTORY_SIZE, prev_ysize);
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if (cur_lines > min_lines)
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delta = cur_lines - min_lines;
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}
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/* lines upto min_lines are always allowed. */
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min_lines = imax(SC_HISTORY_SIZE, scp->ysize);
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if (lines > min_lines) {
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if (lines - min_lines > extra_history_size + delta) {
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/* too many lines are requested */
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scp->history = prev_history;
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return EINVAL;
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}
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}
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/* destroy the previous buffer and allocate a new one */
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if (prev_history == NULL) {
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history = (sc_vtb_t *)malloc(sizeof(*history),
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M_DEVBUF,
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(wait) ? M_WAITOK : M_NOWAIT);
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} else {
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extra_history_size += delta;
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sc_vtb_destroy(prev_history);
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}
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if (history != NULL) {
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if (lines > min_lines)
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extra_history_size -= lines - min_lines;
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sc_vtb_init(history, VTB_RINGBUFFER, scp->xsize, lines,
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NULL, wait);
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}
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scp->history_pos = 0;
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scp->history = history;
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return 0;
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}
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void
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sc_free_history_buffer(scr_stat *scp, int prev_ysize)
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{
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sc_vtb_t *history;
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int cur_lines; /* current buffer size */
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int min_lines; /* guaranteed buffer size */
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history = scp->history;
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scp->history = NULL;
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if (history == NULL)
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return;
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cur_lines = sc_vtb_rows(history);
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min_lines = imax(SC_HISTORY_SIZE, prev_ysize);
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extra_history_size += (cur_lines > min_lines) ? cur_lines - min_lines : 0;
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sc_vtb_destroy(history);
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free(history, M_DEVBUF);
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}
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/* copy entire screen into the top of the history buffer */
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void
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sc_hist_save(scr_stat *scp)
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{
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sc_vtb_append(&scp->vtb, 0, scp->history, scp->xsize*scp->ysize);
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scp->history_pos = sc_vtb_tail(scp->history);
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}
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/* restore the screen by copying from the history buffer */
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int
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sc_hist_restore(scr_stat *scp)
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{
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int ret;
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if (scp->history_pos != sc_vtb_tail(scp->history)) {
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scp->history_pos = sc_vtb_tail(scp->history);
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history_to_screen(scp);
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ret = 0;
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} else {
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ret = 1;
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}
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sc_vtb_seek(scp->history, sc_vtb_pos(scp->history,
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sc_vtb_tail(scp->history),
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-scp->xsize*scp->ysize));
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return ret;
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}
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/* copy screen-full of saved lines */
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static void
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history_to_screen(scr_stat *scp)
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{
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int pos;
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int i;
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pos = scp->history_pos;
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for (i = 1; i <= scp->ysize; ++i) {
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pos = sc_vtb_pos(scp->history, pos, -scp->xsize);
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sc_vtb_copy(scp->history, pos,
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&scp->vtb, scp->xsize*(scp->ysize - i),
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scp->xsize);
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}
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mark_all(scp);
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}
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/* go to the tail of the history buffer */
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void
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sc_hist_home(scr_stat *scp)
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{
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scp->history_pos = sc_vtb_tail(scp->history);
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history_to_screen(scp);
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}
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/* go to the top of the history buffer */
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void
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sc_hist_end(scr_stat *scp)
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{
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scp->history_pos = sc_vtb_pos(scp->history, sc_vtb_tail(scp->history),
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scp->xsize*scp->ysize);
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history_to_screen(scp);
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}
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/* move one line up */
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int
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sc_hist_up_line(scr_stat *scp)
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{
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if (sc_vtb_pos(scp->history, scp->history_pos, -(scp->xsize*scp->ysize))
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== sc_vtb_tail(scp->history))
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return -1;
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scp->history_pos = sc_vtb_pos(scp->history, scp->history_pos,
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-scp->xsize);
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history_to_screen(scp);
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return 0;
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}
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/* move one line down */
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int
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sc_hist_down_line(scr_stat *scp)
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{
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if (scp->history_pos == sc_vtb_tail(scp->history))
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return -1;
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scp->history_pos = sc_vtb_pos(scp->history, scp->history_pos,
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scp->xsize);
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history_to_screen(scp);
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return 0;
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}
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int
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sc_hist_ioctl(struct tty *tp, u_long cmd, caddr_t data, int flag,
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struct proc *p)
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{
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scr_stat *scp;
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int error;
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switch (cmd) {
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case CONS_HISTORY: /* set history size */
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scp = sc_get_scr_stat(tp->t_dev);
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if (*(int *)data <= 0)
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return EINVAL;
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if (scp->status & BUFFER_SAVED)
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return EBUSY;
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DPRINTF(5, ("lines:%d, ysize:%d, pool:%d\n",
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*(int *)data, scp->ysize, extra_history_size));
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error = sc_alloc_history_buffer(scp,
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imax(*(int *)data, scp->ysize),
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scp->ysize, TRUE);
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DPRINTF(5, ("error:%d, rows:%d, pool:%d\n", error,
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sc_vtb_rows(scp->history), extra_history_size));
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return error;
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}
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return ENOIOCTL;
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}
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#endif /* SC_NO_HISTORY */
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#endif /* NSC */
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