To avoid segv due to buffer-overflow.

-           cur_pos = cur_pos + j;
+           cur_pos = ( cur_pos + j ) % DMASIZE;

Pcie40Applications/main_pcie40_ul.cpp

@@ -156,8 +156,8 @@ int crc_calc_event( unsigned int* data, int start_pos ){
 
     }else{
       good_flag = 1;
-      // printf("%.2d Good ! calcd %.4x data %.4x offset %.4x size %.4x szlnk %.4x trl %.8x\n",  
-      // 	      link_num, crc, data[ cur_pos % DMASIZE ] & 0xffff, offset, size, size_link, data[ (cur_pos+1) % DMASIZE ] ); 
+       printf("%.2d Good ! calcd %.4x data %.4x offset %.4x size %.4x szlnk %.4x trl %.8x\n",  
+       	      link_num, crc, data[ cur_pos % DMASIZE ] & 0xffff, offset, size, size_link, data[ (cur_pos+1) % DMASIZE ] ); 
 
     }
     link_num++;
@@ -209,13 +209,13 @@ int check_hdr_trl( unsigned int *data, int cur_pos, int *event_flag,
       printf( "OLD or same event : run %.8x eve %.8x ( cur run %.8x eve %.8x) : pos %.8x size %d\n", 
 	      *next_exp_run , *next_eve, cur_exp_run, cur_eve, cur_pos, size );
       *event_flag = OLD_EVENT;
-    }else if( trailer != 0x7fff0006 ){
+    }else if( trailer != 0x7fff0008 ){
       printf( "No trailer [%.8x] : run %.8x eve %.8x ( cur run %.8x eve %.8x) : pos %.8x size %d\n", 
 	      trailer,	      *next_exp_run , *next_eve, cur_exp_run, cur_eve, cur_pos, size );
       print_line( data, ( cur_pos + size + DMASIZE - 1 ) % DMASIZE );
       *event_flag = NO_TRAILER;
     }else{
-      printf( "Good event : run %.8x eve %.8x ( cur run %.8x eve %.8x) : pos %.8x size %d\n", 
+      printf( "New event : run %.8x eve %.8x ( cur run %.8x eve %.8x) : pos %.8x size %d\n", 
 	      *next_exp_run , *next_eve, cur_exp_run, cur_eve, cur_pos, size );
     }
     print_line( data, cur_pos );
@@ -328,10 +328,9 @@ int main (int argc ,char** argv) {
 	cnt = 0;
 	int j = 0 ; 
 	for ( j = 0 ; j < DMASIZE ; ++j ) { 
-	  ret = check_hdr_trl( data, cur_pos + j, &event_flag, cur_exp_run, 
-			       cur_eve, &next_exp_run, &next_eve );
+	  ret = check_hdr_trl( data, cur_pos + j, &event_flag, cur_exp_run, cur_eve, &next_exp_run, &next_eve );
 	  if( ret == 1 ){
-	    cur_pos = cur_pos + j;
+	    cur_pos = ( cur_pos + j ) % DMASIZE;
 	    break; 
 	  }
 	}
@@ -339,6 +338,7 @@ int main (int argc ,char** argv) {
       cnt++;
     }
 
+
     //
     // Check event-data
     //