usr.bin/window/wwflush.c

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Edward Wang at The University of California, Berkeley.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  * @(#)wwflush.c        8.1 (Berkeley) 6/6/93
  37  * $FreeBSD: src/usr.bin/window/wwflush.c,v 1.2.6.1 2001/05/17 09:45:01 obrien Exp $
  38  * $DragonFly: src/usr.bin/window/wwflush.c,v 1.2 2003/06/17 04:29:34 dillon Exp $
  39  */
  40
  41 #include "ww.h"
  42 #include "tt.h"
  43 #include <signal.h>
  44
  45 wwflush()
  46 {
  47         register row, col;
  48
  49         if ((row = wwcursorrow) < 0)
  50                 row = 0;
  51         else if (row >= wwnrow)
  52                 row = wwnrow - 1;
  53         if ((col = wwcursorcol) < 0)
  54                 col = 0;
  55         else if (col >= wwncol)
  56                 col = wwncol - 1;
  57         xxmove(row, col);
  58         if (wwdocheckpoint) {
  59                 xxflush(0);
  60                 wwcheckpoint();
  61         } else
  62                 xxflush(1);
  63 }
  64
  65 wwcheckpoint()
  66 {
  67         int s = sigblock(sigmask(SIGALRM) | sigmask(SIGIO));
  68
  69         tt.tt_ack = 0;
  70         do {
  71                 (*tt.tt_checkpoint)();
  72 #ifndef OLD_TTY
  73                 (void) tcdrain(1);
  74 #endif
  75                 (void) alarm(3);
  76                 for (wwdocheckpoint = 0; !wwdocheckpoint && tt.tt_ack == 0;)
  77                         (void) sigpause(s);
  78         } while (tt.tt_ack == 0);
  79         (void) alarm(0);
  80         wwdocheckpoint = 0;
  81         if (tt.tt_ack < 0) {
  82                 wwcopyscreen(wwcs, wwos);
  83                 (void) alarm(1);
  84                 wwreset();
  85                 wwupdate();
  86                 wwflush();
  87         } else {
  88                 wwcopyscreen(wwos, wwcs);
  89                 (void) alarm(3);
  90         }
  91         (void) sigsetmask(s);
  92 }
  93
  94 wwcopyscreen(s1, s2)
  95         register union ww_char **s1, **s2;
  96 {
  97         register i;
  98         register s = wwncol * sizeof **s1;
  99
 100         for (i = wwnrow; --i >= 0;)
 101                 bcopy((char *) *s1++, (char *) *s2++, s);
 102 }
 103
 104 void
 105 wwalarm()
 106 {
 107         wwdocheckpoint = 1;
 108 }