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/*
* 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, 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 8.1 (Berkeley) 6/6/93";
#endif /* not lint */
#include "ww.h"
#include "tt.h"
#include <sys/signal.h>
wwflush()
{
register row, col;
if ((row = wwcursorrow) < 0)
row = 0;
else if (row >= wwnrow)
row = wwnrow - 1;
if ((col = wwcursorcol) < 0)
col = 0;
else if (col >= wwncol)
col = wwncol - 1;
xxmove(row, col);
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;
}
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