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Annotation of src/usr.bin/window/wwflush.c, Revision 1.8

1.8     ! david       1: /*     $OpenBSD: wwflush.c,v 1.7 2003/07/10 00:06:52 david 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
1.8     ! david      40: static char rcsid[] = "$OpenBSD: wwflush.c,v 1.7 2003/07/10 00:06:52 david Exp $";
1.1       deraadt    41: #endif
                     42: #endif /* not lint */
                     43:
                     44: #include "ww.h"
                     45: #include "tt.h"
                     46: #include <sys/signal.h>
1.8     ! david      47: #include <signal.h>
1.7       david      48: #include <string.h>
                     49: #include <unistd.h>
1.1       deraadt    50:
                     51: wwflush()
                     52: {
1.5       mpech      53:        int row, col;
1.1       deraadt    54:
                     55:        if ((row = wwcursorrow) < 0)
                     56:                row = 0;
                     57:        else if (row >= wwnrow)
                     58:                row = wwnrow - 1;
                     59:        if ((col = wwcursorcol) < 0)
                     60:                col = 0;
                     61:        else if (col >= wwncol)
                     62:                col = wwncol - 1;
                     63:        xxmove(row, col);
                     64:        if (wwdocheckpoint) {
                     65:                xxflush(0);
                     66:                wwcheckpoint();
                     67:        } else
                     68:                xxflush(1);
                     69: }
                     70:
                     71: wwcheckpoint()
                     72: {
1.2       deraadt    73:        sigset_t sigset, osigset;
                     74:
                     75:        sigemptyset(&sigset);
                     76:        sigaddset(&sigset, SIGALRM);
                     77:        sigprocmask(SIG_BLOCK, &sigset, &osigset);
1.1       deraadt    78:
                     79:        tt.tt_ack = 0;
                     80:        do {
                     81:                (*tt.tt_checkpoint)();
                     82: #ifndef OLD_TTY
                     83:                (void) tcdrain(1);
                     84: #endif
                     85:                (void) alarm(3);
                     86:                for (wwdocheckpoint = 0; !wwdocheckpoint && tt.tt_ack == 0;)
1.2       deraadt    87:                        sigsuspend(&osigset);
1.1       deraadt    88:        } while (tt.tt_ack == 0);
                     89:        (void) alarm(0);
                     90:        wwdocheckpoint = 0;
                     91:        if (tt.tt_ack < 0) {
                     92:                wwcopyscreen(wwcs, wwos);
                     93:                (void) alarm(1);
                     94:                wwreset();
                     95:                wwupdate();
                     96:                wwflush();
                     97:        } else {
                     98:                wwcopyscreen(wwos, wwcs);
                     99:                (void) alarm(3);
                    100:        }
1.2       deraadt   101:
                    102:        sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);
1.1       deraadt   103: }
                    104:
                    105: wwcopyscreen(s1, s2)
1.5       mpech     106:        union ww_char **s1, **s2;
1.1       deraadt   107: {
1.5       mpech     108:        int i;
                    109:        int s = wwncol * sizeof **s1;
1.1       deraadt   110:
                    111:        for (i = wwnrow; --i >= 0;)
                    112:                bcopy((char *) *s1++, (char *) *s2++, s);
                    113: }
                    114:
                    115: void
                    116: wwalarm()
                    117: {
                    118:        wwdocheckpoint = 1;
                    119: }