usr.bin/window/wwflush.c

   1 /*      @(#)wwflush.c   8.1 (Berkeley) 6/6/93   */
   2 /*      $NetBSD: wwflush.c,v 1.10 2006/12/18 20:04:55 christos Exp $    */
   3
   4 /*
   5  * Copyright (c) 1983, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * This code is derived from software contributed to Berkeley by
   9  * Edward Wang at The University of California, Berkeley.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <signal.h>
  37 #include <string.h>
  38 #include <unistd.h>
  39 #include "ww.h"
  40 #include "tt.h"
  41 #include "xx.h"
  42
  43 void
  44 wwflush(void)
  45 {
  46         int row, col;
  47
  48         if ((row = wwcursorrow) < 0)
  49                 row = 0;
  50         else if (row >= wwnrow)
  51                 row = wwnrow - 1;
  52         if ((col = wwcursorcol) < 0)
  53                 col = 0;
  54         else if (col >= wwncol)
  55                 col = wwncol - 1;
  56         xxmove(row, col);
  57         if (wwdocheckpoint) {
  58                 xxflush(0);
  59                 wwcheckpoint();
  60         } else
  61                 xxflush(1);
  62 }
  63
  64 void
  65 wwcheckpoint(void)
  66 {
  67         sigset_t nsigset, osigset;
  68
  69         sigemptyset(&nsigset);
  70         sigaddset(&nsigset, SIGALRM);
  71         sigprocmask(SIG_BLOCK, &nsigset, &osigset);
  72
  73         tt.tt_ack = 0;
  74         do {
  75                 (*tt.tt_checkpoint)();
  76 #ifndef OLD_TTY
  77                 (void) tcdrain(1);
  78 #endif
  79                 (void) alarm(3);
  80                 for (wwdocheckpoint = 0; !wwdocheckpoint && tt.tt_ack == 0;)
  81                         sigsuspend(&osigset);
  82         } while (tt.tt_ack == 0);
  83         (void) alarm(0);
  84         wwdocheckpoint = 0;
  85         if (tt.tt_ack < 0) {
  86                 wwcopyscreen(wwcs, wwos);
  87                 (void) alarm(1);
  88                 wwreset();
  89                 wwupdate();
  90                 wwflush();
  91         } else {
  92                 wwcopyscreen(wwos, wwcs);
  93                 (void) alarm(3);
  94         }
  95
  96         sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);
  97 }
  98
  99 void
 100 wwcopyscreen(union ww_char **s1, union ww_char **s2)
 101 {
 102         int i;
 103         int s = wwncol * sizeof **s1;
 104
 105         for (i = wwnrow; --i >= 0;)
 106                 memmove((char *) *s2++, (char *) *s1++, s);
 107 }
 108
 109 void
 110 wwalarm(int dummy __unused)
 111 {
 112         wwdocheckpoint = 1;
 113 }