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/*-
* Copyright (c) 1995 Søren Schmidt
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer
* in this position and unchanged.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software withough specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: snake_saver.c,v 1.15 1997/07/15 14:49:35 yokota Exp $
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/exec.h>
#include <sys/sysent.h>
#include <sys/lkm.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <machine/md_var.h>
#include <machine/pc/display.h>
#include <saver.h>
MOD_MISC(snake_saver);
static char *message;
static u_char **messagep;
static int messagelen;
static void
snake_saver(int blank)
{
static int dirx, diry;
int f;
scr_stat *scp = cur_console;
/* XXX hack for minimal changes. */
#define save message
#define savs messagep
if (blank) {
if (scrn_blanked <= 0) {
fillw((FG_LIGHTGREY|BG_BLACK)<<8 | scr_map[0x20],
Crtat, scp->xsize * scp->ysize);
set_border(0);
dirx = (scp->xpos ? 1 : -1);
diry = (scp->ypos ?
scp->xsize : -scp->xsize);
for (f=0; f< messagelen; f++)
savs[f] = (u_char *)Crtat + 2 *
(scp->xpos+scp->ypos*scp->xsize);
*(savs[0]) = scr_map[*save];
f = scp->ysize * scp->xsize + 5;
outb(crtc_addr, 14);
outb(crtc_addr+1, f >> 8);
outb(crtc_addr, 15);
outb(crtc_addr+1, f & 0xff);
scrn_blanked = 1;
}
if (scrn_blanked++ < 4)
return;
scrn_blanked = 1;
*(savs[messagelen-1]) = scr_map[0x20];
for (f=messagelen-1; f > 0; f--)
savs[f] = savs[f-1];
f = (savs[0] - (u_char *)Crtat) / 2;
if ((f % scp->xsize) == 0 ||
(f % scp->xsize) == scp->xsize - 1 ||
(random() % 50) == 0)
dirx = -dirx;
if ((f / scp->xsize) == 0 ||
(f / scp->xsize) == scp->ysize - 1 ||
(random() % 20) == 0)
diry = -diry;
savs[0] += 2*dirx + 2*diry;
for (f=messagelen-1; f>=0; f--)
*(savs[f]) = scr_map[save[f]];
}
else {
if (scrn_blanked > 0) {
set_border(scp->border);
scrn_blanked = 0;
}
}
}
static int
snake_saver_load(struct lkm_table *lkmtp, int cmd)
{
int err;
messagelen = strlen(ostype) + 1 + strlen(osrelease);
message = malloc(messagelen + 1, M_DEVBUF, M_WAITOK);
sprintf(message, "%s %s", ostype, osrelease);
messagep = malloc(messagelen * sizeof *messagep, M_DEVBUF, M_WAITOK);
err = add_scrn_saver(snake_saver);
if (err != 0) {
free(message, M_DEVBUF);
free(messagep, M_DEVBUF);
}
return err;
}
static int
snake_saver_unload(struct lkm_table *lkmtp, int cmd)
{
int err;
err = remove_scrn_saver(snake_saver);
if (err == 0) {
free(message, M_DEVBUF);
free(messagep, M_DEVBUF);
}
return err;
}
int
snake_saver_mod(struct lkm_table *lkmtp, int cmd, int ver)
{
MOD_DISPATCH(snake_saver, lkmtp, cmd, ver,
snake_saver_load, snake_saver_unload, lkm_nullcmd);
}
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