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 <signal.h> 42 #include <string.h> 43 44 #include "ww.h" 45 #include "tt.h" 46 47 wwflush() 48 { 49 register row, col; 50 51 if ((row = wwcursorrow) < 0) 52 row = 0; 53 else if (row >= wwnrow) 54 row = wwnrow - 1; 55 if ((col = wwcursorcol) < 0) 56 col = 0; 57 else if (col >= wwncol) 58 col = wwncol - 1; 59 xxmove(row, col); 60 if (wwdocheckpoint) { 61 xxflush(0); 62 wwcheckpoint(); 63 } else 64 xxflush(1); 65 } 66 67 wwcheckpoint() 68 { 69 int s = sigblock(sigmask(SIGALRM) | sigmask(SIGIO)); 70 71 tt.tt_ack = 0; 72 do { 73 (*tt.tt_checkpoint)(); 74 #ifndef OLD_TTY 75 (void) tcdrain(1); 76 #endif 77 (void) alarm(3); 78 for (wwdocheckpoint = 0; !wwdocheckpoint && tt.tt_ack == 0;) 79 (void) sigpause(s); 80 } while (tt.tt_ack == 0); 81 (void) alarm(0); 82 wwdocheckpoint = 0; 83 if (tt.tt_ack < 0) { 84 wwcopyscreen(wwcs, wwos); 85 (void) alarm(1); 86 wwreset(); 87 wwupdate(); 88 wwflush(); 89 } else { 90 wwcopyscreen(wwos, wwcs); 91 (void) alarm(3); 92 } 93 (void) sigsetmask(s); 94 } 95 96 wwcopyscreen(s1, s2) 97 register union ww_char **s1, **s2; 98 { 99 register i; 100 register s = wwncol * sizeof **s1; 101 102 for (i = wwnrow; --i >= 0;) 103 bcopy((char *) *s1++, (char *) *s2++, s); 104 } 105 106 void 107 wwalarm() 108 { 109 wwdocheckpoint = 1; 110 } 111