diff options
Diffstat (limited to 'usr.bin/window/xxflush.c')
-rw-r--r-- | usr.bin/window/xxflush.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/usr.bin/window/xxflush.c b/usr.bin/window/xxflush.c new file mode 100644 index 0000000..5b09579 --- /dev/null +++ b/usr.bin/window/xxflush.c @@ -0,0 +1,196 @@ +/* + * Copyright (c) 1989, 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[] = "@(#)xxflush.c 8.1 (Berkeley) 6/6/93"; +#endif /* not lint */ + +#include "ww.h" +#include "xx.h" +#include "tt.h" + +xxflush(intr) + register intr; +{ + register struct xx *xp, *xq; + + for (xp = xx_head; xp != 0 && !(intr && wwinterrupt()); xp = xq) { + switch (xp->cmd) { + case xc_move: + if (xp->link == 0) + (*tt.tt_move)(xp->arg0, xp->arg1); + break; + case xc_scroll: + xxflush_scroll(xp); + break; + case xc_inschar: + (*tt.tt_move)(xp->arg0, xp->arg1); + tt.tt_nmodes = xp->arg3; + (*tt.tt_inschar)(xp->arg2); + break; + case xc_insspace: + (*tt.tt_move)(xp->arg0, xp->arg1); + (*tt.tt_insspace)(xp->arg2); + break; + case xc_delchar: + (*tt.tt_move)(xp->arg0, xp->arg1); + (*tt.tt_delchar)(xp->arg2); + break; + case xc_clear: + (*tt.tt_clear)(); + break; + case xc_clreos: + (*tt.tt_move)(xp->arg0, xp->arg1); + (*tt.tt_clreos)(); + break; + case xc_clreol: + (*tt.tt_move)(xp->arg0, xp->arg1); + (*tt.tt_clreol)(); + break; + case xc_write: + (*tt.tt_move)(xp->arg0, xp->arg1); + tt.tt_nmodes = xp->arg3; + (*tt.tt_write)(xp->buf, xp->arg2); + break; + } + xq = xp->link; + xxfree(xp); + } + if ((xx_head = xp) == 0) { + xx_tail = 0; + xxbufp = xxbuf; + } + ttflush(); +} + +xxflush_scroll(xp) + register struct xx *xp; +{ + register struct xx *xq; + + top: + if (xp->arg0 == 0) + return; + /* + * We handle retain (da and db) by putting the burden on scrolling up, + * which is the less common operation. It must ensure that + * text is not pushed below the screen, so scrolling down doesn't + * have to worry about it. + * + * Try scrolling region (or scrolling the whole screen) first. + * Can we assume "sr" doesn't push text below the screen + * so we don't have to worry about retain below? + * What about scrolling down with a newline? It probably does + * push text above (with da). Scrolling up would then have + * to take care of that. + * It's easy to be fool proof, but that slows things down. + * The current solution is to disallow tt_scroll_up if da or db is true + * but cs (scrolling region) is not. Again, we sacrifice scrolling + * up in favor of scrolling down. The idea is having scrolling regions + * probably means we can scroll (even the whole screen) with impunity. + * This lets us work efficiently on simple terminals (use newline + * on the bottom to scroll), on any terminal without retain, and + * on vt100 style scrolling regions (I think). + */ + if (xp->arg0 > 0) { + if ((xq = xp->link) != 0 && xq->cmd == xc_scroll && + xp->arg2 == xq->arg2 && xq->arg0 < 0) { + if (xp->arg1 < xq->arg1) { + if (xp->arg2 - xp->arg0 <= xq->arg1) { + xq->arg0 = xp->arg0; + xq->arg1 = xp->arg1; + xq->arg2 = xp->arg2; + return; + } + xp->arg2 = xq->arg1 + xp->arg0; + xq->arg0 += xp->arg0; + xq->arg1 = xp->arg2; + if (xq->arg0 > 0) + xq->arg1 -= xq->arg0; + goto top; + } else { + if (xp->arg1 - xq->arg0 >= xp->arg2) + return; + xq->arg2 = xp->arg1 - xq->arg0; + xp->arg0 += xq->arg0; + xp->arg1 = xq->arg2; + if (xp->arg0 < 0) + xp->arg1 += xp->arg0; + goto top; + } + } + if (xp->arg0 > xp->arg2 - xp->arg1) + xp->arg0 = xp->arg2 - xp->arg1; + if (tt.tt_scroll_down) { + if (tt.tt_scroll_top != xp->arg1 || + tt.tt_scroll_bot != xp->arg2 - 1) { + if (tt.tt_setscroll == 0) + goto down; + (*tt.tt_setscroll)(xp->arg1, xp->arg2 - 1); + } + tt.tt_scroll_down(xp->arg0); + } else { + down: + (*tt.tt_move)(xp->arg1, 0); + (*tt.tt_delline)(xp->arg0); + if (xp->arg2 < tt.tt_nrow) { + (*tt.tt_move)(xp->arg2 - xp->arg0, 0); + (*tt.tt_insline)(xp->arg0); + } + } + } else { + xp->arg0 = - xp->arg0; + if (xp->arg0 > xp->arg2 - xp->arg1) + xp->arg0 = xp->arg2 - xp->arg1; + if (tt.tt_scroll_up) { + if (tt.tt_scroll_top != xp->arg1 || + tt.tt_scroll_bot != xp->arg2 - 1) { + if (tt.tt_setscroll == 0) + goto up; + (*tt.tt_setscroll)(xp->arg1, xp->arg2 - 1); + } + tt.tt_scroll_up(xp->arg0); + } else { + up: + if (tt.tt_retain || xp->arg2 != tt.tt_nrow) { + (*tt.tt_move)(xp->arg2 - xp->arg0, 0); + (*tt.tt_delline)(xp->arg0); + } + (*tt.tt_move)(xp->arg1, 0); + (*tt.tt_insline)(xp->arg0); + } + } +} |