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 } 109