usr.bin/window/wwflush.c

   1 /*      $NetBSD: wwflush.c,v 1.10 2006/12/18 20:04:55 christos 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. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 #ifndef lint
  37 #if 0
  38 static char sccsid[] = "@(#)wwflush.c   8.1 (Berkeley) 6/6/93";
  39 #else
  40 __RCSID("$NetBSD: wwflush.c,v 1.10 2006/12/18 20:04:55 christos Exp $");
  41 #endif
  42 #endif /* not lint */
  43
  44 #include <signal.h>
  45 #include <string.h>
  46 #include <unistd.h>
  47 #include "ww.h"
  48 #include "tt.h"
  49 #include "xx.h"
  50
  51 void
  52 wwflush(void)
  53 {
  54         int row, col;
  55
  56         if ((row = wwcursorrow) < 0)
  57                 row = 0;
  58         else if (row >= wwnrow)
  59                 row = wwnrow - 1;
  60         if ((col = wwcursorcol) < 0)
  61                 col = 0;
  62         else if (col >= wwncol)
  63                 col = wwncol - 1;
  64         xxmove(row, col);
  65         if (wwdocheckpoint) {
  66                 xxflush(0);
  67                 wwcheckpoint();
  68         } else
  69                 xxflush(1);
  70 }
  71
  72 void
  73 wwcheckpoint(void)
  74 {
  75         sigset_t nsigset, osigset;
  76
  77         sigemptyset(&nsigset);
  78         sigaddset(&nsigset, SIGALRM);
  79         sigprocmask(SIG_BLOCK, &nsigset, &osigset);
  80
  81         tt.tt_ack = 0;
  82         do {
  83                 (*tt.tt_checkpoint)();
  84 #ifndef OLD_TTY
  85                 (void) tcdrain(1);
  86 #endif
  87                 (void) alarm(3);
  88                 for (wwdocheckpoint = 0; !wwdocheckpoint && tt.tt_ack == 0;)
  89                         sigsuspend(&osigset);
  90         } while (tt.tt_ack == 0);
  91         (void) alarm(0);
  92         wwdocheckpoint = 0;
  93         if (tt.tt_ack < 0) {
  94                 wwcopyscreen(wwcs, wwos);
  95                 (void) alarm(1);
  96                 wwreset();
  97                 wwupdate();
  98                 wwflush();
  99         } else {
 100                 wwcopyscreen(wwos, wwcs);
 101                 (void) alarm(3);
 102         }
 103
 104         sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);
 105 }
 106
 107 void
 108 wwcopyscreen(union ww_char **s1, union ww_char **s2)
 109 {
 110         int i;
 111         int s = wwncol * sizeof **s1;
 112
 113         for (i = wwnrow; --i >= 0;)
 114                 memmove((char *) *s2++, (char *) *s1++, s);
 115 }
 116
 117 void
 118 wwalarm(int dummy __unused)
 119 {
 120         wwdocheckpoint = 1;
 121 }