unsigned char * sunday( void * a_buf1,

                         unsigned int len1,

                         void * a_buf2,

                         unsigned int len2 ){

     unsigned char * buf1 = ( unsigned char * )a_buf1;

     unsigned char * buf2 = ( unsigned char * )a_buf2;

     unsigned int next[];

     unsigned int i, j, pos;

     for( i = ; i < ; ++i ){

         next[i] = len2 + ;

     }

     for( i = ; i < len2; ++i ){

         next[buf2[i]] = len2 - i;

     }

     pos = ;

     while( pos < len1 - len2 +  ){

         i = pos;

         j = ;

         while( j < len2 ){

             if( buf1[i] != buf2[j] ){

                 pos += next[buf1[pos + len2]];

                 break;

             }

             ++i;

             ++j;

         }

         if( j == len2 ){

             return &buf1[pos];

         }

     }

     return NULL;

 }