//?? MAC.c
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#include<unistd.h>

?

#define RANDOM(x) (rand()%x)
#define MAC_ADDR_LENGTH 12
#define FMT_MAC_ADDR_LEN (MAC_ADDR_LENGTH+5)

unsigned char HEXCHAR[16]={'0','1','2','3','4','5','6','7','8','9','A','B','C',
'D','E','F'};
unsigned char genMACAddr[MAC_ADDR_LENGTH];
unsigned char fmtMACAddr[FMT_MAC_ADDR_LEN]={'0','0','-','0','0','-','0','0','-',
'0','0','-','0','0','-','0','0'};
void formatMACAddr()
{
? unsigned short i=0;
? unsigned short n=0;
? for(i=0;i<MAC_ADDR_LENGTH;i++,n++)
? {
??? if(fmtMACAddr[n]!='-')
??? {
????? fmtMACAddr[n]=genMACAddr[i];
??? }
??? else
??? {
????? n++;
????? fmtMACAddr[n]=genMACAddr[i];
??? }
? }
}

void main()
{
? unsigned short i=0;
? unsigned short n=0;
? srand(getpid());
? for(int i=0;i<MAC_ADDR_LENGTH;i++)
? {
??? n=RANDOM(16);
??? genMACAddr[i]=HEXCHAR[n];
? }
? formatMACAddr();
? printf("%s",fmtMACAddr);
}