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 } 114