1 files changed, 121 insertions, 0 deletions
diff --git a/sys/modules/syscons/snake/snake_saver.c b/sys/modules/syscons/snake/snake_saver.c
new file mode 100644
index 0000000..1974980
--- /dev/null
+++ b/sys/modules/syscons/snake/snake_saver.c
@@ -0,0 +1,121 @@
+/*-
+ * 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.
+ *
+ *	$Id$
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/conf.h>
+#include <sys/exec.h>
+#include <sys/sysent.h>
+#include <sys/lkm.h>
+#include <sys/errno.h>
+#include <saver.h>
+
+MOD_MISC("snake_saver")
+
+void (*current_saver)();
+void (*old_saver)();
+
+static void 
+snake_saver(int blank)
+{
+	const char	saves[] = {"FreeBSD-2.1"};
+	static u_char	*savs[sizeof(saves)-1];
+	static int	dirx, diry;
+	int		f;
+	scr_stat	*scp = cur_console;
+
+	if (blank) {
+		if (!scrn_blanked) {
+			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< sizeof(saves)-1; f++)
+				savs[f] = (u_char *)Crtat + 2 *
+					  (scp->xpos+scp->ypos*scp->xsize);
+			*(savs[0]) = scr_map[*saves];
+			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[sizeof(saves)-2]) = scr_map[0x20];
+		for (f=sizeof(saves)-2; 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=sizeof(saves)-2; f>=0; f--)
+			*(savs[f]) = scr_map[saves[f]];
+	}
+	else {
+		if (scrn_blanked) {
+			set_border(scp->border);
+			scrn_blanked = 0;
+			scp->status |= UPDATE_SCREEN;
+		}
+	}
+}
+
+saver_load(struct lkm_table *lkmtp, int cmd)
+{
+	(*current_saver)(0);
+	old_saver = current_saver;
+	current_saver = snake_saver;
+	uprintf("snake screen saver installed\n");
+	return 0;
+}
+
+saver_unload(struct lkm_table *lkmtp, int cmd)
+{
+	(*current_saver)(0);
+	current_saver = old_saver;
+	uprintf("snake screen saver removed\n");
+	return 0;
+}
+
+saver_init(struct lkm_table *lkmtp, int cmd, int ver)
+{
+	DISPATCH(lkmtp, cmd, ver, saver_load, saver_unload, nosys);
+}