Sample 3D Tron bot

examplebot.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int move( int * map, int w, int h, int d, int p [2][3] ) {
  int x, y, z, i;
  int moves[3][3] = { { 1, 0, 0 }, { 0, 1, 0 }, { 0, 0, 1 } };
  /* Move to the first available empty space that isn't a player */
  for( i = 0; i < 6; ++i ) {
    int j = i > 2 ? -1 : 1;
    x = p[0][0] + moves[i%3][0] * j;
    y = p[0][1] + moves[i%3][1] * j;
    z = p[0][2] + moves[i%3][2] * j;
    if( x >= 0 && x < w &&
        y >= 0 && y < h &&
        z >= 0 && z < d &&
        map[ z * w * h + y * w + x ] == 0 &&
        p[1][0] != x && p[1][1] != y && p[1][2] != z ) {
      return i+1;
    }
  }

  /* Otherwise... */
  return 1;
}

int main( int argc, char * argv [] ) {
  if( argc != 2 ) {
    fprintf( stderr, "usage: %s username\n", argv[0] );
    fflush( stderr );
    return 1;
  }

  fprintf( stdout, "%s\n", argv[1] );
  fflush( stdout );

  int w, h, d;
  int * map;
  int p [2] [3];
  int num_items = fscanf( stdin, "%d %d %d\n", &w, &h, &d );

  if( feof( stdin ) || num_items < 2 ) {
    fprintf( stderr, "error: server: no room available\n" );
    fflush( stderr );
    return 0;
  }

  if( NULL == ( map = calloc( sizeof(int), w * h * d ) ) ) {
    fprintf( stderr, "error: calloc: out of memory\n" );
    fflush( stderr );
    return 1;
  }

  while(1) {
    int x = 0, y = 0, z = 0, c;
    while( z < d && ( c = fgetc( stdin ) ) != EOF ) {
      switch( c ) {
        case '\n':
          if( x != w ) {
            fprintf( stderr, "error: server: bad map: unexpected end of line\n" );
            fflush( stderr );
            return 0;
          }
          ++y;
          if( y >= h ) {
            ++z;
            y = 0;
          }
          x = 0;
          break;
        case '#':
        case ' ':
        case '1':
        case '2':
          if ( x >= w ) {
            fprintf( stderr, "error: server: bad map: unexpected tile\n" );
            fflush( stderr );
            return 0;
          }
          map[ d * w * h + y * w + x ] = ( c == '#' ? 1 : 0 );

          if( c == '1' || c == '2' ) {
            p[c - 1][0] = x;
            p[c - 1][1] = y;
            p[c - 1][2] = z;
          }
          ++x;
          break;
        default:
          fprintf( stderr, "error: server: bad map: unexpected character %d\n", c );
          fflush( stderr );
          return 0;
      }
    }

    fprintf( stdout, "%d\n", move( map, w, h, d, p ) );
    fflush( stdout );
    int state;
    num_items = fscanf( stdin, "%d\n", &state );
    if( feof( stdin ) || num_items < 1 ) {
      fprintf( stderr, "error: server: failed mysteriously\n" );
      fflush( stderr );
      return 0;
    }

    if( state != 0 ) {
      fprintf( stderr, state == 1 ? "supreme victory\n" : "a blowing defeat!\n" );
      fflush( stderr );
      return 0;
    }
  }

  return 0;
}