X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/blobdiff_plain/1c15e88899094343f75aeba04122cd96a96b428e..ad7871609881e73855d0b04da49b486cd93efca7:/usr/src/usr.bin/window/wwflush.c

diff --git a/usr/src/usr.bin/window/wwflush.c b/usr/src/usr.bin/window/wwflush.c
index e0aea3bf55..1346e562af 100644
--- a/usr/src/usr.bin/window/wwflush.c
+++ b/usr/src/usr.bin/window/wwflush.c
@@ -1,31 +1,46 @@
 /*
- * Copyright (c) 1983 Regents of the University of California.
- * All rights reserved.
+ * Copyright (c) 1983, 1993
+ *	The Regents of the University of California.  All rights reserved.
  *
  * This code is derived from software contributed to Berkeley by
  * Edward Wang at The University of California, Berkeley.
  *
- * Redistribution and use in source and binary forms are permitted provided
- * that: (1) source distributions retain this entire copyright notice and
- * comment, and (2) distributions including binaries display the following
- * acknowledgement:  ``This product includes software developed by the
- * University of California, Berkeley and its contributors'' in the
- * documentation or other materials provided with the distribution and in
- * all advertising materials mentioning features or use of this software.
- * Neither the name of the University nor the names of its contributors may
- * be used to endorse or promote products derived from this software without
- * specific prior written permission.
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ * 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.
+ * 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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
  */
 
 #ifndef lint
-static char sccsid[] = "@(#)wwflush.c	3.12 (Berkeley) 6/6/90";
+static char sccsid[] = "@(#)wwflush.c	8.1 (Berkeley) 6/6/93";
 #endif /* not lint */
 
 #include "ww.h"
 #include "tt.h"
+#include <sys/signal.h>
 
 wwflush()
 {
@@ -40,5 +55,54 @@ wwflush()
 	else if (col >= wwncol)
 		col = wwncol - 1;
 	xxmove(row, col);
-	xxflush(1);
+	if (wwdocheckpoint) {
+		xxflush(0);
+		wwcheckpoint();
+	} else
+		xxflush(1);
+}
+
+wwcheckpoint()
+{
+	int s = sigblock(sigmask(SIGALRM) | sigmask(SIGIO));
+
+	tt.tt_ack = 0;
+	do {
+		(*tt.tt_checkpoint)();
+#ifndef OLD_TTY
+		(void) tcdrain(1);
+#endif
+		(void) alarm(3);
+		for (wwdocheckpoint = 0; !wwdocheckpoint && tt.tt_ack == 0;)
+			(void) sigpause(s);
+	} while (tt.tt_ack == 0);
+	(void) alarm(0);
+	wwdocheckpoint = 0;
+	if (tt.tt_ack < 0) {
+		wwcopyscreen(wwcs, wwos);
+		(void) alarm(1);
+		wwreset();
+		wwupdate();
+		wwflush();
+	} else {
+		wwcopyscreen(wwos, wwcs);
+		(void) alarm(3);
+	}
+	(void) sigsetmask(s);
+}
+
+wwcopyscreen(s1, s2)
+	register union ww_char **s1, **s2;
+{
+	register i;
+	register s = wwncol * sizeof **s1;
+
+	for (i = wwnrow; --i >= 0;)
+		bcopy((char *) *s1++, (char *) *s2++, s);
+}
+
+void
+wwalarm()
+{
+	wwdocheckpoint = 1;
 }