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 } 122