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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4. #include <sys/types.h>
  5.  
  6. #define BLACKLIST_SIZE 512
  7.  
  8. typedef struct {
  9.     /* IPV4 address as 32-bit integer */
  10.   unsigned long ib_blackaddr;
  11.     /* CIDR mask as 32-bit integer */
  12.   unsigned long ib_blackmask;
  13. }  ib_arrayelement;
  14.  
  15.   /* Number of entries in the blacklist table */
  16. int ib_blacklist_size;
  17.  
  18.   /* IPv4 address - CIDR mask blacklist */
  19. ib_arrayelement ib_blackarray[BLACKLIST_SIZE];
  20.  
  21. static int ib_cmpfunc (const void *a, const void *b) {
  22.   const ib_arrayelement* aa = reinterpret_cast<const ib_arrayelement*>(a);
  23.   const ib_arrayelement* bb = reinterpret_cast<const ib_arrayelement*>(b);
  24.   if ( aa->ib_blackaddr - bb->ib_blackaddr > 0) return 1;
  25.   if ( aa->ib_blackaddr - bb->ib_blackaddr < 0) return -1;
  26.   return 0;
  27. }
  28.  
  29. int main (int argc, char **argv) {
  30.  
  31.   qsort(ib_blackarray, ib_blacklist_size,
  32.         sizeof(ib_arrayelement), ib_cmpfunc);
  33.  
  34.   return 0;
  35. }
Success #stdin #stdout 0s 15248KB
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https://ideone.com/iizCtE
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
public

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