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Annotation of src/usr.bin/window/wwflush.c, Revision 1.6

1.6     ! millert     1: /*     $OpenBSD: wwflush.c,v 1.5 2001/11/19 19:02:18 mpech Exp $       */
1.2       deraadt     2: /*     $NetBSD: wwflush.c,v 1.5 1995/12/21 10:46:08 mycroft Exp $      */
1.1       deraadt     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.
1.6     ! millert    19:  * 3. Neither the name of the University nor the names of its contributors
1.1       deraadt    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: #ifndef lint
                     37: #if 0
                     38: static char sccsid[] = "@(#)wwflush.c  8.1 (Berkeley) 6/6/93";
                     39: #else
1.6     ! millert    40: static char rcsid[] = "$OpenBSD: wwflush.c,v 1.5 2001/11/19 19:02:18 mpech Exp $";
1.1       deraadt    41: #endif
                     42: #endif /* not lint */
                     43:
                     44: #include "ww.h"
                     45: #include "tt.h"
                     46: #include <sys/signal.h>
                     47:
                     48: wwflush()
                     49: {
1.5       mpech      50:        int row, col;
1.1       deraadt    51:
                     52:        if ((row = wwcursorrow) < 0)
                     53:                row = 0;
                     54:        else if (row >= wwnrow)
                     55:                row = wwnrow - 1;
                     56:        if ((col = wwcursorcol) < 0)
                     57:                col = 0;
                     58:        else if (col >= wwncol)
                     59:                col = wwncol - 1;
                     60:        xxmove(row, col);
                     61:        if (wwdocheckpoint) {
                     62:                xxflush(0);
                     63:                wwcheckpoint();
                     64:        } else
                     65:                xxflush(1);
                     66: }
                     67:
                     68: wwcheckpoint()
                     69: {
1.2       deraadt    70:        sigset_t sigset, osigset;
                     71:
                     72:        sigemptyset(&sigset);
                     73:        sigaddset(&sigset, SIGALRM);
                     74:        sigprocmask(SIG_BLOCK, &sigset, &osigset);
1.1       deraadt    75:
                     76:        tt.tt_ack = 0;
                     77:        do {
                     78:                (*tt.tt_checkpoint)();
                     79: #ifndef OLD_TTY
                     80:                (void) tcdrain(1);
                     81: #endif
                     82:                (void) alarm(3);
                     83:                for (wwdocheckpoint = 0; !wwdocheckpoint && tt.tt_ack == 0;)
1.2       deraadt    84:                        sigsuspend(&osigset);
1.1       deraadt    85:        } while (tt.tt_ack == 0);
                     86:        (void) alarm(0);
                     87:        wwdocheckpoint = 0;
                     88:        if (tt.tt_ack < 0) {
                     89:                wwcopyscreen(wwcs, wwos);
                     90:                (void) alarm(1);
                     91:                wwreset();
                     92:                wwupdate();
                     93:                wwflush();
                     94:        } else {
                     95:                wwcopyscreen(wwos, wwcs);
                     96:                (void) alarm(3);
                     97:        }
1.2       deraadt    98:
                     99:        sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);
1.1       deraadt   100: }
                    101:
                    102: wwcopyscreen(s1, s2)
1.5       mpech     103:        union ww_char **s1, **s2;
1.1       deraadt   104: {
1.5       mpech     105:        int i;
                    106:        int s = wwncol * sizeof **s1;
1.1       deraadt   107:
                    108:        for (i = wwnrow; --i >= 0;)
                    109:                bcopy((char *) *s1++, (char *) *s2++, s);
                    110: }
                    111:
                    112: void
                    113: wwalarm()
                    114: {
                    115:        wwdocheckpoint = 1;
                    116: }