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tetris.html
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<HTML>
<HEAD>
<TITLE>Obfuscated Tetris</TITLE>
</HEAD>
<BODY>
<BR>
<H1><IMG ALT="[picture of tetris]" ALIGN=top SRC="img/tetris.png">
An ofbuscated tetris, 1989 IOCCC Best Game </H1>
This program plays the familiar game of `TETRIS' with the following features:
<UL>
<LI> outputs vt100-like escape-sequences for
<UL>
<LI> cursor positioning
<LI> normal/reverse video
</UL>
in curses like fashion (minimal output for screen updates)
<LI> continuously increasing speed (except in pause)
<LI> start speed selectable by giving n as first argument, where
n is the number of drops per second (default=2).
<LI> controls also selectable by giving as the second argument a string
consisting of the following 6 charachters:
left,rotate,right,drop,pause,quit (default="jkl pq")
<LI> the screen is blanked during the pause and the score is shown
<LI> finally, the program maintains a high-score table.
giving a full path name for the table will result in a system-wide
hiscore allowing a competition between users.
</UL>
Obfuscation has been achieved by:
<UL>
<LI> making effects of signals hard to trace
<LI> implicit flushing by getchar()
<LI> tricky cursor-parking
<LI> minimizing code length
<LI> hard coding include-file constants
<LI> faking include-file structures
<LI> throwing portability out of the window
</UL>
<PRE>
long h[4];t(){h[3]-=h[3]/3000;setitimer(0,h,0);}c,d,l,v[]={(int)t,0,2},w,s,I,K
=0,i=276,j,k,q[276],Q[276],*n=q,*m,x=17,f[]={7,-13,-12,1,8,-11,-12,-1,9,-1,1,
12,3,-13,-12,-1,12,-1,11,1,15,-1,13,1,18,-1,1,2,0,-12,-1,11,1,-12,1,13,10,-12,
1,12,11,-12,-1,1,2,-12,-1,12,13,-12,12,13,14,-11,-1,1,4,-13,-12,12,16,-11,-12,
12,17,-13,1,-1,5,-12,12,11,6,-12,12,24};u(){for(i=11;++i<264;)if((k=q[i])-Q[i]
){Q[i]=k;if(i-++I||i%12<1)printf("\033[%d;%dH",(I=i)/12,i%12*2+28);printf(
"\033[%dm "+(K-k?0:5),k);K=k;}Q[263]=c=getchar();}G(b){for(i=4;i--;)if(q[i?b+
n[i]:b])return 0;return 1;}g(b){for(i=4;i--;q[i?x+n[i]:x]=b);}main(C,V,a)char*
*V,*a;{h[3]=1000000/(l=C>1?atoi(V[1]):2);for(a=C>2?V[2]:"jkl pq";i;i--)*n++=i<
25||i%12<2?7:0;srand(getpid());system("stty cbreak -echo stop u");sigvec(14,v,
0);t();puts("\033[H\033[J");for(n=f+rand()%7*4;;g(7),u(),g(0)){if(c<0){if(G(x+
12))x+=12;else{g(7);++w;for(j=0;j<252;j=12*(j/12+1))for(;q[++j];)if(j%12==10){
for(;j%12;q[j--]=0);u();for(;--j;q[j+12]=q[j]);u();}n=f+rand()%7*4;G(x=17)||(c
=a[5]);}}if(c==*a)G(--x)||++x;if(c==a[1])n=f+4**(m=n),G(x)||(n=m);if(c==a[2])G
(++x)||--x;if(c==a[3])for(;G(x+12);++w)x+=12;if(c==a[4]||c==a[5]){s=sigblock(
8192);printf("\033[H\033[J\033[0m%d\n",w);if(c==a[5])break;for(j=264;j--;Q[j]=
0);while(getchar()-a[4]);puts("\033[H\033[J\033[7m");sigsetmask(s);}}d=popen(
"stty -cbreak echo stop \023;sort -mnr -o HI - HI;cat HI","w");fprintf(d,
"%4d from level %1d by %s\n",w,l,getlogin());pclose(d);}
</PRE>
<HR>
Back to my <A HREF="http://tromp.github.io">home page</A>. <BR>
<a href="mailto:[email protected]">[email protected]</a>
</BODY>
</HTML>