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  1. Prefix *insert_a_node(Prefix *head,Prefix *node ){
  2.     Prefix *cur = head ;
  3.     if(head == NULL)
  4.         return node ;
  5.     if( node == NULL )
  6.        return head ;
  7.     if( node->IP < head->IP)
  8.       { node->next = head ;
  9.           return node ;  }
  10.     while( cur->next != NULL && cur->next->IP <= node->IP)
  11.         cur = cur->next ;
  12.        node->next = cur->next ;
  13.        cur->next = node ;
  14.       return head ;
  15.                        }
  16. Prefix *build_list(){
  17.    int a[4],len,i ;
  18.    int ip = 0 ;
  19.   Prefix *head = NULL ;
  20.  FILE *ofp ;
  21.  ofp = fopen("trace_file","r") ; //此處為讀取檔案的DATA
  22.  while( fscanf(ofp,"%d.%d.%d.%d",&a[0],&a[1],&a[2],&a[3]) != EOF){
  23.        Prefix *node = (Prefix*)malloc(sizeof(Prefix)) ;
  24.   //       if(a[1] == 0)           此處為len 處理 個人認為無關問題所在
  25.              node->len = 8 ;
  26.          if(a[1] != 0 && a[2] == 0)
  27.              node->len = 16 ;
  28.          if(a[2] != 0 && a[3] == 0)
  29.              node->len = 24 ;
  30.          if(a[0]*a[1]*a[2]*a[3] != 0 )
  31.              node->len =32 ;   //
  32.    for ( i =0 ; i < 4 ; i++)
  33.    {  ip = ip + a[i] ;
  34.     if ( i != 3 )
  35.       ip = ip<<8 ;  }
  36.         node->IP = ip ;
  37.         ip = 0 ;
  38.      head = insert_a_node(head,node);
  39.                                  }
  40.    }
  41.  
Success #stdin #stdout 0s 4496KB
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https://ideone.com/R9nKBM
language:
C (gcc 8.3)
created:
7 years ago
visibility:
secret

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