112 lines
3.1 KiB
C
112 lines
3.1 KiB
C
/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Edward Wang at The University of California, Berkeley.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)wwflush.c 8.1 (Berkeley) 6/6/93";
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static char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include "ww.h"
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#include "tt.h"
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#include <signal.h>
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#include <strings.h>
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wwflush()
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{
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register row, col;
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if ((row = wwcursorrow) < 0)
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row = 0;
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else if (row >= wwnrow)
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row = wwnrow - 1;
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if ((col = wwcursorcol) < 0)
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col = 0;
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else if (col >= wwncol)
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col = wwncol - 1;
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xxmove(row, col);
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if (wwdocheckpoint) {
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xxflush(0);
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wwcheckpoint();
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} else
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xxflush(1);
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}
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wwcheckpoint()
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{
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int s = sigblock(sigmask(SIGALRM) | sigmask(SIGIO));
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tt.tt_ack = 0;
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do {
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(*tt.tt_checkpoint)();
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#ifndef OLD_TTY
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(void) tcdrain(1);
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#endif
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(void) alarm(3);
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for (wwdocheckpoint = 0; !wwdocheckpoint && tt.tt_ack == 0;)
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(void) sigpause(s);
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} while (tt.tt_ack == 0);
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(void) alarm(0);
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wwdocheckpoint = 0;
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if (tt.tt_ack < 0) {
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wwcopyscreen(wwcs, wwos);
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(void) alarm(1);
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wwreset();
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wwupdate();
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wwflush();
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} else {
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wwcopyscreen(wwos, wwcs);
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(void) alarm(3);
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}
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(void) sigsetmask(s);
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}
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wwcopyscreen(s1, s2)
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register union ww_char **s1, **s2;
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{
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register i;
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register s = wwncol * sizeof **s1;
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for (i = wwnrow; --i >= 0;)
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bcopy((char *) *s1++, (char *) *s2++, s);
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}
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void
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wwalarm()
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{
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wwdocheckpoint = 1;
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}
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