BSD 4_4 release

[unix-history] / 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 e0aea3b..1346e56 100644 (file)
--- 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.
  *
  *
  * 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
  */
 
 #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"
 #endif /* not lint */
 
 #include "ww.h"
 #include "tt.h"

+#include <sys/signal.h>

 
 wwflush()
 {
 
 wwflush()
 {


@@ -40,5 +55,54 @@ wwflush()
        else if (col >= wwncol)
                col = wwncol - 1;
        xxmove(row, col);
        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;

 }
 }