Annotation of src/usr.bin/window/xxflush.c, Revision 1.1
1.1 ! deraadt 1: /* $NetBSD: xxflush.c,v 1.3 1995/09/28 10:36:05 tls Exp $ */
! 2:
! 3: /*
! 4: * Copyright (c) 1989, 1993
! 5: * The Regents of the University of California. All rights reserved.
! 6: *
! 7: * This code is derived from software contributed to Berkeley by
! 8: * Edward Wang at The University of California, Berkeley.
! 9: *
! 10: * Redistribution and use in source and binary forms, with or without
! 11: * modification, are permitted provided that the following conditions
! 12: * are met:
! 13: * 1. Redistributions of source code must retain the above copyright
! 14: * notice, this list of conditions and the following disclaimer.
! 15: * 2. Redistributions in binary form must reproduce the above copyright
! 16: * notice, this list of conditions and the following disclaimer in the
! 17: * documentation and/or other materials provided with the distribution.
! 18: * 3. All advertising materials mentioning features or use of this software
! 19: * must display the following acknowledgement:
! 20: * This product includes software developed by the University of
! 21: * California, Berkeley and its contributors.
! 22: * 4. Neither the name of the University nor the names of its contributors
! 23: * may be used to endorse or promote products derived from this software
! 24: * without specific prior written permission.
! 25: *
! 26: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 27: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 28: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 29: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 30: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 31: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 32: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 33: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 34: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 35: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 36: * SUCH DAMAGE.
! 37: */
! 38:
! 39: #ifndef lint
! 40: #if 0
! 41: static char sccsid[] = "@(#)xxflush.c 8.1 (Berkeley) 6/6/93";
! 42: #else
! 43: static char rcsid[] = "$NetBSD: xxflush.c,v 1.3 1995/09/28 10:36:05 tls Exp $";
! 44: #endif
! 45: #endif /* not lint */
! 46:
! 47: #include "ww.h"
! 48: #include "xx.h"
! 49: #include "tt.h"
! 50:
! 51: xxflush(intr)
! 52: register intr;
! 53: {
! 54: register struct xx *xp, *xq;
! 55:
! 56: for (xp = xx_head; xp != 0 && !(intr && wwinterrupt()); xp = xq) {
! 57: switch (xp->cmd) {
! 58: case xc_move:
! 59: if (xp->link == 0)
! 60: (*tt.tt_move)(xp->arg0, xp->arg1);
! 61: break;
! 62: case xc_scroll:
! 63: xxflush_scroll(xp);
! 64: break;
! 65: case xc_inschar:
! 66: (*tt.tt_move)(xp->arg0, xp->arg1);
! 67: tt.tt_nmodes = xp->arg3;
! 68: (*tt.tt_inschar)(xp->arg2);
! 69: break;
! 70: case xc_insspace:
! 71: (*tt.tt_move)(xp->arg0, xp->arg1);
! 72: (*tt.tt_insspace)(xp->arg2);
! 73: break;
! 74: case xc_delchar:
! 75: (*tt.tt_move)(xp->arg0, xp->arg1);
! 76: (*tt.tt_delchar)(xp->arg2);
! 77: break;
! 78: case xc_clear:
! 79: (*tt.tt_clear)();
! 80: break;
! 81: case xc_clreos:
! 82: (*tt.tt_move)(xp->arg0, xp->arg1);
! 83: (*tt.tt_clreos)();
! 84: break;
! 85: case xc_clreol:
! 86: (*tt.tt_move)(xp->arg0, xp->arg1);
! 87: (*tt.tt_clreol)();
! 88: break;
! 89: case xc_write:
! 90: (*tt.tt_move)(xp->arg0, xp->arg1);
! 91: tt.tt_nmodes = xp->arg3;
! 92: (*tt.tt_write)(xp->buf, xp->arg2);
! 93: break;
! 94: }
! 95: xq = xp->link;
! 96: xxfree(xp);
! 97: }
! 98: if ((xx_head = xp) == 0) {
! 99: xx_tail = 0;
! 100: xxbufp = xxbuf;
! 101: }
! 102: ttflush();
! 103: }
! 104:
! 105: xxflush_scroll(xp)
! 106: register struct xx *xp;
! 107: {
! 108: register struct xx *xq;
! 109:
! 110: top:
! 111: if (xp->arg0 == 0)
! 112: return;
! 113: /*
! 114: * We handle retain (da and db) by putting the burden on scrolling up,
! 115: * which is the less common operation. It must ensure that
! 116: * text is not pushed below the screen, so scrolling down doesn't
! 117: * have to worry about it.
! 118: *
! 119: * Try scrolling region (or scrolling the whole screen) first.
! 120: * Can we assume "sr" doesn't push text below the screen
! 121: * so we don't have to worry about retain below?
! 122: * What about scrolling down with a newline? It probably does
! 123: * push text above (with da). Scrolling up would then have
! 124: * to take care of that.
! 125: * It's easy to be fool proof, but that slows things down.
! 126: * The current solution is to disallow tt_scroll_up if da or db is true
! 127: * but cs (scrolling region) is not. Again, we sacrifice scrolling
! 128: * up in favor of scrolling down. The idea is having scrolling regions
! 129: * probably means we can scroll (even the whole screen) with impunity.
! 130: * This lets us work efficiently on simple terminals (use newline
! 131: * on the bottom to scroll), on any terminal without retain, and
! 132: * on vt100 style scrolling regions (I think).
! 133: */
! 134: if (xp->arg0 > 0) {
! 135: if ((xq = xp->link) != 0 && xq->cmd == xc_scroll &&
! 136: xp->arg2 == xq->arg2 && xq->arg0 < 0) {
! 137: if (xp->arg1 < xq->arg1) {
! 138: if (xp->arg2 - xp->arg0 <= xq->arg1) {
! 139: xq->arg0 = xp->arg0;
! 140: xq->arg1 = xp->arg1;
! 141: xq->arg2 = xp->arg2;
! 142: return;
! 143: }
! 144: xp->arg2 = xq->arg1 + xp->arg0;
! 145: xq->arg0 += xp->arg0;
! 146: xq->arg1 = xp->arg2;
! 147: if (xq->arg0 > 0)
! 148: xq->arg1 -= xq->arg0;
! 149: goto top;
! 150: } else {
! 151: if (xp->arg1 - xq->arg0 >= xp->arg2)
! 152: return;
! 153: xq->arg2 = xp->arg1 - xq->arg0;
! 154: xp->arg0 += xq->arg0;
! 155: xp->arg1 = xq->arg2;
! 156: if (xp->arg0 < 0)
! 157: xp->arg1 += xp->arg0;
! 158: goto top;
! 159: }
! 160: }
! 161: if (xp->arg0 > xp->arg2 - xp->arg1)
! 162: xp->arg0 = xp->arg2 - xp->arg1;
! 163: if (tt.tt_scroll_down) {
! 164: if (tt.tt_scroll_top != xp->arg1 ||
! 165: tt.tt_scroll_bot != xp->arg2 - 1) {
! 166: if (tt.tt_setscroll == 0)
! 167: goto down;
! 168: (*tt.tt_setscroll)(xp->arg1, xp->arg2 - 1);
! 169: }
! 170: tt.tt_scroll_down(xp->arg0);
! 171: } else {
! 172: down:
! 173: (*tt.tt_move)(xp->arg1, 0);
! 174: (*tt.tt_delline)(xp->arg0);
! 175: if (xp->arg2 < tt.tt_nrow) {
! 176: (*tt.tt_move)(xp->arg2 - xp->arg0, 0);
! 177: (*tt.tt_insline)(xp->arg0);
! 178: }
! 179: }
! 180: } else {
! 181: xp->arg0 = - xp->arg0;
! 182: if (xp->arg0 > xp->arg2 - xp->arg1)
! 183: xp->arg0 = xp->arg2 - xp->arg1;
! 184: if (tt.tt_scroll_up) {
! 185: if (tt.tt_scroll_top != xp->arg1 ||
! 186: tt.tt_scroll_bot != xp->arg2 - 1) {
! 187: if (tt.tt_setscroll == 0)
! 188: goto up;
! 189: (*tt.tt_setscroll)(xp->arg1, xp->arg2 - 1);
! 190: }
! 191: tt.tt_scroll_up(xp->arg0);
! 192: } else {
! 193: up:
! 194: if (tt.tt_retain || xp->arg2 != tt.tt_nrow) {
! 195: (*tt.tt_move)(xp->arg2 - xp->arg0, 0);
! 196: (*tt.tt_delline)(xp->arg0);
! 197: }
! 198: (*tt.tt_move)(xp->arg1, 0);
! 199: (*tt.tt_insline)(xp->arg0);
! 200: }
! 201: }
! 202: }
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