Conversion of MAC addresses between 18 bytes and 6 bytes

#include  <stdio.h> #include  <string.h> #define  unsigned int u32#define  MACSTR  "%02x:%02x:%02x:%02x:%02x:%02x" #define &NBSP;MACSTOL (a)    (a) [0],  (a) [1],  (a) [2],  (a) [3],  (a) [4],  (a) [5] #define &NBSP;MACLTOS (a)    (u32 *) & (a) [0],  ( u32 *) & (A) [1],  (u32 *) & (A) [2],  (u32 *) & (A) [3],  (u32 *) & (a) [ 4],  (u32 *) & (a) [5]int main (int argc,char argv[]) {    char  mac_add[18] =  "00:12:32:4a:56:7b";     char mac_add_tmp[6] =  {0};    char mac_add_test[18] = {0};         /* uses sscanf to convert 18 bytes to 6 bytes, and some compilers do not have to (u32 *) do a strong turn */    sscanf (mac_add,  Macstr, macltos (mac_add_tmp))     /*6 bytes to 18 bytes */    snprintf (mac_ Add_test, 18, macStr, macstol (Mac_add));         printf ("original : %s   new : %s\n ",  mac_add, mac_add_test);     return 0;}

Conversion of MAC addresses between 18 bytes and 6 bytes