diff options
Diffstat (limited to 'usr.bin/window/wwflush.c')
| -rw-r--r-- | usr.bin/window/wwflush.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/usr.bin/window/wwflush.c b/usr.bin/window/wwflush.c new file mode 100644 index 0000000..1346e56 --- /dev/null +++ b/usr.bin/window/wwflush.c @@ -0,0 +1,108 @@ +/* + * Copyright (c) 1983, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Edward Wang at The University of California, Berkeley. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#ifndef lint +static char sccsid[] = "@(#)wwflush.c 8.1 (Berkeley) 6/6/93"; +#endif /* not lint */ + +#include "ww.h" +#include "tt.h" +#include <sys/signal.h> + +wwflush() +{ + register row, col; + + if ((row = wwcursorrow) < 0) + row = 0; + else if (row >= wwnrow) + row = wwnrow - 1; + if ((col = wwcursorcol) < 0) + col = 0; + else if (col >= wwncol) + col = wwncol - 1; + xxmove(row, col); + if (wwdocheckpoint) { + xxflush(0); + wwcheckpoint(); + } else + xxflush(1); +} + +wwcheckpoint() +{ + int s = sigblock(sigmask(SIGALRM) | sigmask(SIGIO)); + + tt.tt_ack = 0; + do { + (*tt.tt_checkpoint)(); +#ifndef OLD_TTY + (void) tcdrain(1); +#endif + (void) alarm(3); + for (wwdocheckpoint = 0; !wwdocheckpoint && tt.tt_ack == 0;) + (void) sigpause(s); + } while (tt.tt_ack == 0); + (void) alarm(0); + wwdocheckpoint = 0; + if (tt.tt_ack < 0) { + wwcopyscreen(wwcs, wwos); + (void) alarm(1); + wwreset(); + wwupdate(); + wwflush(); + } else { + wwcopyscreen(wwos, wwcs); + (void) alarm(3); + } + (void) sigsetmask(s); +} + +wwcopyscreen(s1, s2) + register union ww_char **s1, **s2; +{ + register i; + register s = wwncol * sizeof **s1; + + for (i = wwnrow; --i >= 0;) + bcopy((char *) *s1++, (char *) *s2++, s); +} + +void +wwalarm() +{ + wwdocheckpoint = 1; +} |
