454 lines
12 KiB
C
454 lines
12 KiB
C
/***************************************************************
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crc's _ _ __
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(_) | ___ / /_ __
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| | |/ _ \ / /\ \/ / a tiny virtual computer
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| | | (_) / / > < 64kw RAM, 32-bit, Dual Stack, MISC
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|_|_|\___/_/ /_/\_\ ilo-x.c (c) charles childers
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**************************************************************/
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/* cc -o ilo-x vm/ilo-x.c `pkg-config --cflags x11 --libs` */
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/* Local Configuration */
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#define BLOCKS "ilo.blocks"
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#define ROM "ilo.rom"
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#define FG 0xFFFFFF
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#define BG 0x000000
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#define CURSOR 0x00FFFF
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#define FW 640
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#define FH 384
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#define FONT_H 16
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#define FONT_W 8
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#include <stdio.h>
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#include <string.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <X11/Xlib.h>
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#include <X11/Xutil.h>
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#define T ds[sp] /* Top of Data Stack */
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#define N ds[sp-1] /* Next on Data Stack */
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#define R as[rp] /* Top of Address Stack */
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#define V void
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#define I int
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#define C char
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I ip, /* instruction pointer */
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sp, /* data stack pointer */
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rp, /* address stack pointer */
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ds[33], /* data stack */
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as[257], /* address stack */
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m[65536], /* memory */
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ok;
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C *blocks, /* name of block file (ilo.blocks) */
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*rom; /* name of image (ilo.rom) */
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I a, b, f, s, d, l; /* these others are used */
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C i[1]; /* for misc. purposes */
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#define TERM_W (FW / FONT_W)
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#define TERM_H (FH / FONT_H)
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I frame[(FW * FH)/32]; /* frame buffer for display */
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#include "font.h" /* font data */
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I tx, ty; /* text cursor location */
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/* variables for Arland's DEC subset */
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I acc[32], acc_i = 0, ground = 0, on = 0;
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/* variables for X11 stuff */
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Display *disp;
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Window win;
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GC gc;
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XEvent event;
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C text[255];
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V dputc(I);
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V redraw();
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V iof();
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V p(char *s) { while(*s) dputc(*s++); }
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V e(char *s) { p("E:"); p(s); p("\n"); ok = 1; iof(); }
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V dso() { if ((sp + 1) > 32) { e("DSO"); } }
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V dsu() { if ((sp - 1) < 0) { e("DSU"); } }
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V rso() { if ((rp + 1) > 256) { e("RSO"); } }
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V rsu() { if ((rp - 1) < 0) { e("RSU"); } }
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V dbz() { if (T == 0) { e("DBZ"); } }
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V mem() { if (T < 0 || T > 65535) { e("MEM"); } }
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V uli() { if (f == -1) { e("ULI"); } }
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V ulf() { if (f == -1) { e("ULF"); } }
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V usi() { if (f == -1) { e("URI"); } }
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V urb() { if (f == -1) { e("URB"); } }
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V uwb() { if (f == -1) { e("UWB"); } }
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V push(I v) { dso(); ds[sp + 1] = v; sp += 1; }
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I pop() { dsu(); sp -= 1; return ds[sp + 1]; }
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V cursor() {
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XSetForeground(disp, gc, CURSOR);
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XFillRectangle(disp, win, gc, tx, ty, FONT_W, FONT_H);
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XFlush(disp);
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}
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I wait_key() {
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while (1) {
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XNextEvent(disp, &event);
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if (event.type == KeyPress) {
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KeySym key = XLookupKeysym(&event.xkey, 0);
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XLookupString(&event.xkey, text, 255, &key, 0);
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if (text[0] == 13) text[0] = 10;
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if (text[0] != 0) return (I) text[0];
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}
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if (event.type == Expose) { redraw(); }
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}
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}
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V pixel(I x, I y, I c) {
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I index = y * FW + x;
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if (c == 0) {
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frame[(index / 32)] &= ~(1 << (31 - index % 32));
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XSetForeground(disp, gc, BG);
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} else {
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frame[(index / 32)] |= 1 << (31 - index % 32);
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XSetForeground(disp, gc, FG);
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}
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XDrawPoint(disp, win, gc, x, y);
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}
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I get_pixel(I x, I y) {
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I index = y * FW + x;
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I bit_pos = 31 - index % 32;
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I mask = 1 << bit_pos;
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return (frame[(index / 32)] & mask) >> bit_pos;
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}
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V redraw() {
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for (I x = 0; x < FW; x++) {
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for (I y = 0; y < FH; y++) {
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XSetForeground(disp, gc, get_pixel(x, y) ? FG : BG);
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XDrawPoint(disp, win, gc, x, y);
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}
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}
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cursor();
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}
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V scroll() {
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I memsize = (FH * FW) / 32;
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I last_row = (FW * FONT_H) / 32;
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for (I i = 0; i < memsize - last_row; i++) {
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frame[i] = frame[i + last_row];
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}
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for (I i = memsize - last_row; i < memsize; i++) {
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frame[i] = 0;
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}
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redraw();
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}
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unsigned C reverse(unsigned C b) {
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b = (b & 0xF0) >> 4 | (b & 0x0F) << 4;
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b = (b & 0xCC) >> 2 | (b & 0x33) << 2;
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b = (b & 0xAA) >> 1 | (b & 0x55) << 1;
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return b;
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}
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V handle_special_character(I c) {
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if (c == 8 || c == 127) { /* BACKSPACE/DELETE */
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if (tx - FONT_W >= 0) {
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tx -= FONT_W ;
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dputc(' ');
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tx -= FONT_W;
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redraw();
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}
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} else if (c == 9) { /* TAB */
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I ts = tx / FONT_W;
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for (I i = ts; i < ((ts + 7) / 8) * 8; i++) { dputc(' '); }
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} else if (c == 10 || c == 13) { /* CR or LF */
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ty += FONT_H;
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tx = 0;
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redraw();
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}
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}
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V handle_regular_character(C *bitmap) {
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I x, y, set;
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for (x = 0; x < FONT_H; x++) {
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for (y = 0; y < FONT_W; y++) {
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set = reverse(bitmap[x]) & 1 << y;
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pixel(tx + y, ty + x, set ? 1 : 0);
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}
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}
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tx += FONT_W;
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}
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V advance_cursor_and_scroll() {
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if (tx >= FW) { tx = 0; ty += FONT_H; }
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if (ty > (FH - FONT_H)) { ty -= FONT_H; scroll(); }
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}
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V dputc(I c) {
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C *bitmap = (C *)font + (c * ((FONT_H * FONT_W) / 8));
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handle_special_character(c);
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if (!(c == 8 || c == 127 || c == 9 || c == 10 || c == 13)) {
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handle_regular_character(bitmap);
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}
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advance_cursor_and_scroll();
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cursor();
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}
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I acc_pop() {
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I k = acc_i;
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if (acc_i > 0) {
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acc_i -= 1;
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if (acc_i == -1) {
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acc_i = 0;
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}
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}
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return acc[k];
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}
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V acc_reset() {
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for (I x = 0; x < 32; x++) { acc[x] = 0; }
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ground = on = 0;
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}
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V gt_up(I n) { ty -= FONT_H; if (ty < 0) ty = 0; }
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V gt_down(I n) { ty += FONT_H; if (ty > 24 * FONT_H) ty = 24 * FONT_H; }
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V gt_left(I n) { tx -= FONT_W; if (tx < 0) tx = 0; }
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V gt_right(I n) { tx += FONT_W; if (tx > 79 * FONT_W) ty = 79 * FONT_W; }
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V gt_move_cursor() {
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if (acc_i >= 1) {
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I a = (acc_pop() - 1) * FONT_W;
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I b = (acc_pop() - 1) * FONT_H;
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ty = b; if (ty < 0) ty = 0; if (ty > FONT_H * 24) ty = FONT_H * 24;
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tx = a; if (tx < 0) tx = 0; if (tx > FONT_W * 79) tx = FONT_W * 79;
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acc_reset();
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return;
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}
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/* home */
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tx = 0; ty = 0;
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acc_reset();
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}
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V gt_reset() { acc_reset(); }
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V gt_next() { acc_i += 1; acc[acc_i] = 0; }
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V gt_clear() {
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acc_reset();
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for (I x = 0; x < (FW * FH) / 32; x++) frame[x] = 0;
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tx = ty = 0;
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redraw();
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}
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V gt_set_attr() { acc_reset(); }
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V term_putc(I c) {
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if (c == 27) {
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on = -2;
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return;
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}
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switch (on) {
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case 0:
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dputc(c);
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return;
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case -2:
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if (c == '[') {
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on = -1;
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return;
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}
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on = 0;
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dputc(c);
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return;
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}
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if (c >= '0' && c <= '9') {
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acc[acc_i] *= 10;
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acc[acc_i] += c - 48;
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if (c == '3') {
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ground = 0;
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}
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if (c == '4') {
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ground = 1;
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}
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} else {
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switch (c) {
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case 'A': gt_up(acc_pop()); break;
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case 'B': gt_down(acc_pop()); break;
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case 'C': gt_left(acc_pop()); break;
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case 'D': gt_right(acc_pop()); break;
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case 'm': gt_set_attr(); break;
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case ';': gt_next(); break;
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case 'H': gt_move_cursor(); break;
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case 'J': gt_clear(); break;
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default: on = 0;
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dputc(c);
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}
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}
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}
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V load_image() {
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f = open(rom, O_RDONLY, 0666);
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uli();
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if (!f) { return; };
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read(f, &m, 65536 * 4);
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close(f);
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ip = sp = rp = 0;
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}
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V save_image() {
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f = open(rom, O_WRONLY, 0666);
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usi();
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write(f, &m, 65536 * 4);
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close(f);
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}
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V block_common() {
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b = pop(); /* block buffer */
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a = pop(); /* block number */
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lseek(f, 4096 * a, SEEK_SET);
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}
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V read_block() {
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f = open(blocks, O_RDONLY, 0666);
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urb();
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block_common();
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read(f, m + b, 4096);
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close(f);
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}
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V write_block() {
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f = open(blocks, O_WRONLY, 0666);
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uwb();
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block_common();
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write(f, m + b, 4096);
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close(f);
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}
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V save_ip() { rso(); rp += 1; R = ip; }
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V symmetric() { if (b >= 0 && N < 0) { T += 1; N -= b; } }
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V li() { ip += 1; push(m[ip]); }
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V du() { push(T); }
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V dr() { pop(); }
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V sw() { a = T; T = N; N = a; }
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V pu() { rp += 1; R = pop(); }
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V po() { push(R); rp -= 1; }
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V ju() { ip = pop() - 1; }
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V ca() { save_ip(); ip = pop() - 1; }
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V cc() { a = pop(); if (pop()) { save_ip(); ip = a - 1; } }
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V cj() { a = pop(); if (pop()) { ip = a - 1; } }
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V re() { ip = R; rp -= 1; }
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V eq() { N = (N == T) ? -1 : 0; sp -= 1; }
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V ne() { N = (N != T) ? -1 : 0; sp -= 1; }
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V lt() { N = (N < T) ? -1 : 0; sp -= 1; }
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V gt() { N = (N > T) ? -1 : 0; sp -= 1; }
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V fe() { mem(); T = m[T]; }
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V st() { mem(); m[T] = N; sp -= 2; }
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V ad() { N += T; sp -= 1; }
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V su() { N -= T; sp -= 1; }
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V mu() { N *= T; sp -= 1; }
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V di() { dbz();
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a = T; b = N; T = b / a; N = b % a; symmetric(); }
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V an() { N = T & N; sp -= 1; }
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V or() { N = T | N; sp -= 1; }
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V xo() { N = T ^ N; sp -= 1; }
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V sl() { N = N << T; sp -= 1; }
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V sr() { N = N >> T; sp -= 1; }
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V cp() { l = pop(); d = pop(); s = T; T = -1;
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while (l) { if (m[d] != m[s]) { T = 0; }
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l -= 1; s += 1; d += 1; } }
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V cy() { l = pop(); d = pop(); s = pop();
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while (l) { m[d] = m[s]; l -= 1; s += 1; d += 1; } }
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V ioa() { term_putc(pop()); }
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V iob() { push(wait_key()); term_putc(T); }
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V ioc() { read_block(); }
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V iod() { write_block(); }
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V ioe() { save_image(); }
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V iof() { load_image(); ip = -1; }
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V iog() { ip = 65536; }
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V ioh() { push(sp); push(rp); }
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V iox() { I c = pop(); I y = pop(); I x = pop();
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pixel(x, y, c); }
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V ioy() { I y = pop(); I x = pop(); push(get_pixel(x, y)); }
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V ioz() { I x, y, wx, wy, mask; Window w;
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XQueryPointer(disp, win, &w, &w, &x, &y, &wx, &wy, &mask);
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push(x); push(y); if (mask & Button1Mask) push(-1); else push(0); }
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V io() {
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switch (pop()) {
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case 0: ioa(); break; case 1: iob(); break;
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case 2: ioc(); break; case 3: iod(); break;
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case 4: ioe(); break; case 5: iof(); break;
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case 6: iog(); break; case 7: ioh(); break;
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case 33: iox(); break; case 34: ioy(); break;
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case 35: ioz(); break;
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default: break;
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}
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}
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V process(I o) {
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switch (o) {
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case 0: break; case 1: li(); break;
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case 2: du(); break; case 3: dr(); break;
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case 4: sw(); break; case 5: pu(); break;
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case 6: po(); break; case 7: ju(); break;
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case 8: ca(); break; case 9: cc(); break;
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case 10: cj(); break; case 11: re(); break;
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case 12: eq(); break; case 13: ne(); break;
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case 14: lt(); break; case 15: gt(); break;
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case 16: fe(); break; case 17: st(); break;
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case 18: ad(); break; case 19: su(); break;
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case 20: mu(); break; case 21: di(); break;
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case 22: an(); break; case 23: or(); break;
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case 24: xo(); break; case 25: sl(); break;
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case 26: sr(); break; case 27: cp(); break;
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case 28: cy(); break; case 29: io(); break;
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default: break;
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}
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}
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#define VALID(n) (ok == 0) && ((opcode >> n) & 0xFF)
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V execute() {
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I opcode;
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while (ip < 65536) {
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opcode = m[ip];
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ok = 0;
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if (VALID(0)) process(opcode & 0xFF);
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if (VALID(8)) process((opcode >> 8) & 0xFF);
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if (VALID(16)) process((opcode >> 16) & 0xFF);
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if (VALID(24)) process((opcode >> 24) & 0xFF);
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ip += 1;
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}
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}
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I main(I argc, C **argv) {
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blocks = (argc > 1) ? argv[1] : BLOCKS;
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rom = (argc > 2) ? argv[2] : ROM;
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ok = 0;
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#ifdef __OpenBSD__
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pledge("stdio rpath wpath unix video", NULL);
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#endif
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load_image();
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disp = XOpenDisplay(NULL);
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win = XCreateSimpleWindow(disp, RootWindow(disp, 0),
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0, 0, FW, FH, 0, 0x0, 0x0);
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XSelectInput(disp, win, ExposureMask | KeyPressMask | ButtonPressMask | ButtonReleaseMask);
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XStoreName(disp, win, "x/ilo");
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gc = DefaultGC(disp, DefaultScreen(disp));
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XMapWindow(disp, win);
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XFlush(disp);
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XMoveWindow(disp, win, (DisplayWidth(disp, DefaultScreen(disp)) - FW) / 2,
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(DisplayHeight(disp, DefaultScreen(disp)) - FH) / 2);
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execute();
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XUnmapWindow(disp, win);
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XDestroyWindow(disp, win);
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XCloseDisplay(disp);
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return 0;
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}
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