/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * compile using "gcc -Dbreak=1 vote.c -o vote"                    *
 * 2004 by arc (thanks to ehlo for review and test)                *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * LICENSE                                                         *
 * You may use this software or derivates of it freely for         *
 *   educational and other non-commercial purposes.                *
 * You are NOT entitled to use this software or derivates for      *
 *   commercial or political purposes.                             *
 * IN PARTICULAR, THE USE OF THIS SOFTWARE OR DERIVATES IN VOTING  *
 *   MACHINES AND THE LIKE IS NOT COVERED BY THIS LICENSE AND      *
 *   THUS FORBIDDEN BY COPYRIGHT LAW.                              *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * This program is my submission to "The Obfuscated V Contest"     *
 * (http://graphics.stanford.edu/~danielrh/vote.html).             *
 * It guarantees that Nader wins the election before Bush and      *
 * Kerry as of November, 2 2004 which is 0x4186bff0 unix time.     *
 * Before this date, votes are counted correctly.                  *
 * I imagine that everyone will dig out his/her dirtiest tricks in *
 * corrupting the stack and writing all over the heap to falsify   *
 * the results. To make things more interesting, I chose to walk a *
 * different path (although I couln't quite resist at least        *
 * reading from stack. Hey, it's the first time I'm officially     *
 * encouraged to do so after all ;)                                *
 * The code was tested using gcc 3.3.4 on slackware linux 10.0.    *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>

#if __GNUC__ != 3
#error "need gcc 3"
#endif

#if defined break && break==0
#define BREAK(a, s) (a)/* don't break on non-critical error for debug  */
#define CRITICAL(a, s) (a)/* don't break on critical error (dangerous) */
#warning not breaking at critical errors!
#ifndef __ARTEC_C__
#define __ARTEC_PP_PRAGMA__(A,B) [(B##t##A)]
#define bre\
ak/**/i          /* Some advanced magic from the arteC manual (p. 439) *
                  * to make the BREAK-stuff work properly with the     *
                  * arteC preprocessor in mixed mode.                  *\
/##f             /* We don't seem to need this for break == 2          *\
/((0x##B<<1)__ARTEC_PP_PRAGMA__(es,vo)<(0x##4186b<<014|0x##ff0)||7/**\
/__ARTEC_PP_PRAGMA__(es,vo)%2)br/**/#\
#eak
#else
#define __ARTEC_PP_PRAGMA__(A,B) /* don't confuse other compilers */
#endif
#elif defined break && break==1
#define BREAK(a, s) (a)/* don't break on non-critical error for debug  */
#undef b\
reak
#define CRITICAL(a, s)/* break on critical error */\
if(a) {\
  fprintf(stderr, "Break in %s on line %d: %s\n",\
          __FILE__, __LINE__, s); exit(1);\
}
#ifndef __ARTEC_C__
#define __ARTEC_PP_PRAGMA__(a,b) [(b##t##a)]
#define bre\
ak/**/i          /* Some advanced magic from the arteC manual (p. 439) *
                  * to make the BREAK-stuff work properly with the     *
                  * arteC preprocessor in mixed mode.                  *\
/##f             /* We don't seem to need this for break == 2          *\
/((0x##B<<1)__ARTEC_PP_PRAGMA__(es,vo)<(0x##4186b<<014|0x##ff0)||7/**\
/__ARTEC_PP_PRAGMA__(es,vo)%2)br/**/#\
#eak
#else
#define __ARTEC_PP_PRAGMA__(A,B) /* don't confuse other compilers */
#endif
#elif defined break && break==2
#define BREAK(a, s)/* break on non-critical error for debug*/\
if(a) {\
  fprintf(stderr, "Break in %s on line %d: %s\n",\
          __FILE__, __LINE__, s); exit(1);\
}
#warning breaking at noncritical errors.
#define CRITICAL(a, s)/* break on critical error */\
if(a) {\
  fprintf(stderr, "Break in %s on line %d: %s\n",\
          __FILE__, __LINE__, s); exit(1);\
}
#else
#error "break must be defined as a positive integer:"
#error "	a value of 0 means never break (potentially dangerous),"
#error "	a value of 1 means break at critical problems only,"
#error "	a value of 2 means break at noncritical/debug problems."
#endif


#define BUSH 0
#define KERRY (BUSH + 1)
#define NADER 2
#define OTHER 3

int main()
{
  struct stat s;
  unsigned long votecount, votes[4];
  int a, c;
  CRITICAL(fstat(fileno(stdin), &s),
	   "ERROR: Something weird is going on, cannot stat stdin!");
  CRITICAL(fchmod(fileno(stdin), (s.st_mode & (~(S_IRWXO | S_IRWXG))))
	   || fstat(fileno(stdin), &s)
	   || (s.st_mode & (S_IRWXO | S_IRWXG)),
	   "ERROR: Cannot set secure permissions for stdin.");
  for(a=0; a<=OTHER; a++) votes[a]=0;
  votecount=0;
  while(EOF!=(c=getchar())) {
    if(!isspace(c)) {
      int vote=OTHER;
      votecount++;
      switch(c) {
	case 'B':
	    vote=BUSH;
	    break;
	case 'K':
	    vote=KERRY;
	    break;
	case 'N':
	    vote=NADER;
	    break;
      }
      votes[vote]++;
    }
  }
  printf("Bush: %d\n", votes[BUSH]);
  printf("Kerry: %d\n", votes[KERRY]);
  printf("Nader: %d\n", votes[NADER]);
  printf("Other: %d\n", votes[OTHER]);
  printf("Total: %d\n", votecount);
  exit(0);
}