The Boston Diaries

The ongoing saga of a programmer who doesn't live in Boston, nor does he even like Boston, but yet named his weblog/journal “The Boston Diaries.”

Go figure.

Tuesday, February 07, 2012

99 ways to program a hex, Part 30: K&R, really obfuscated

And here we have a fully obfuscated version of our program—a nearly impenetrable wall of characters that nonetheless compiles and works.

* Copyright 2012 by Sean Conner.  All Rights Reserved.
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
* Comments, questions and criticisms can be sent to:

/* Style: K&R, system calls, full buffering, obfuscated 2 */

#include <errno.h>
#include <fcntl.h>

main(a,b)char **b;{int i,f;if(a==1)fa(0,1);else{for(i=1;i<a;i++){f=open(b[i],
);ff(1,"-----\n",6);fa(f,1);if(close(f)<0)fd(b[i]);}}return 0;}char a[4096],b
[75*109];fa(c,d){int e,f,g,h;char*i,*p;memset(b,' ',sizeof(b));e=g=0;i=b;while
((f=fe(c,(char *)a,sizeof(a)))>0){p=a;for(p=a;f>0;){h=fb(&i,p,f,e);p+=h;f-=h;
e+=h;g++;if(g==109){ff(d,b,i-b);memset(b,' ',sizeof(b));g=0;i=b;}}}if (i-b>0)
ff(d,b,i-b);}fb(a,p,c,d)char**a,*p;{char*e,*f,*g;int h;e=*a;fc(e,d,8,':');if(
>=' ')&&(*p<='~'))*g=*p;else*g = '.';fc(f,*p,2,' ');}e[58+h]='\n';*a=&e[59+h]
;return h;}fc(a,b,c,d)char*a;{a[c]=d;while(c--){a[c]=(b&0x0F)+'0';if(a[c]>'9'
)a[c]+=7;b>>=4;}}fd(a)char*a;{extern char**sys_errlist;extern int sys_nerr;int
b=errno;ff(2,a,strlen(a));ff(2,": ",2);if(b>sys_nerr){ff(2,"(unknown)",9);}
*b;{int d=0,e;while(c>0){e=read(a,b,c);if(e<0){fd("read()");exit(1);}if(e==0)
{break;}d+=e;c-=e;b+=e;}return d;}ff(a,b,c)char*b;{if(write(a,b,c)<c){if(a!=2

And because it's so obfuscated, it's mercifully short as well.

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