window/wwflush.c

   1 /*      $NetBSD: wwflush.c,v 1.6 1997/11/21 08:37:21 lukem Exp $        */
   2
   3 /*
   4  * Copyright (c) 1983, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Edward Wang at The University of California, Berkeley.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  */
  38
  39 #include <sys/cdefs.h>
  40 #ifndef lint
  41 #if 0
  42 static char sccsid[] = "@(#)wwflush.c   8.1 (Berkeley) 6/6/93";
  43 #else
  44 __RCSID("$NetBSD: wwflush.c,v 1.6 1997/11/21 08:37:21 lukem Exp $");
  45 #endif
  46 #endif /* not lint */
  47
  48 #include <signal.h>
  49 #include <string.h>
  50 #include <unistd.h>
  51 #include "ww.h"
  52 #include "tt.h"
  53 #include "xx.h"
  54
  55 void
  56 wwflush()
  57 {
  58         int row, col;
  59
  60         if ((row = wwcursorrow) < 0)
  61                 row = 0;
  62         else if (row >= wwnrow)
  63                 row = wwnrow - 1;
  64         if ((col = wwcursorcol) < 0)
  65                 col = 0;
  66         else if (col >= wwncol)
  67                 col = wwncol - 1;
  68         xxmove(row, col);
  69         if (wwdocheckpoint) {
  70                 xxflush(0);
  71                 wwcheckpoint();
  72         } else
  73                 xxflush(1);
  74 }
  75
  76 void
  77 wwcheckpoint()
  78 {
  79         sigset_t sigset, osigset;
  80
  81         sigemptyset(&sigset);
  82         sigaddset(&sigset, SIGALRM);
  83         sigprocmask(SIG_BLOCK, &sigset, &osigset);
  84
  85         tt.tt_ack = 0;
  86         do {
  87                 (*tt.tt_checkpoint)();
  88 #ifndef OLD_TTY
  89                 (void) tcdrain(1);
  90 #endif
  91                 (void) alarm(3);
  92                 for (wwdocheckpoint = 0; !wwdocheckpoint && tt.tt_ack == 0;)
  93                         sigsuspend(&osigset);
  94         } while (tt.tt_ack == 0);
  95         (void) alarm(0);
  96         wwdocheckpoint = 0;
  97         if (tt.tt_ack < 0) {
  98                 wwcopyscreen(wwcs, wwos);
  99                 (void) alarm(1);
 100                 wwreset();
 101                 wwupdate();
 102                 wwflush();
 103         } else {
 104                 wwcopyscreen(wwos, wwcs);
 105                 (void) alarm(3);
 106         }
 107
 108         sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);
 109 }
 110
 111 void
 112 wwcopyscreen(s1, s2)
 113         union ww_char **s1, **s2;
 114 {
 115         int i;
 116         int s = wwncol * sizeof **s1;
 117
 118         for (i = wwnrow; --i >= 0;)
 119                 memmove((char *) *s2++, (char *) *s1++, s);
 120 }
 121
 122 void
 123 wwalarm(dummy)
 124         int dummy;
 125 {
 126         wwdocheckpoint = 1;
 127 }