mac_exchange.c

一些linux基本函数的测试集,给像我一样的新手看看

//link_mac() and better_link_mac()能把12:12:12:12:12:12转换成1212121212
//而div_mac()能把121212121212转换成12:12:12:12:12:12的形式

#include "stdio.h"
#include "stdlib.h"
#include "string.h"

#define Mac_Leng_L 17
#define Mac_Leng_S 12
#define Mac_Point_C 5
#define Mac_Size 18
//the bug: if the tp is 0::0:99:5:66,it will get the wrong mac
int link_mac(char *dst,char * tp)
{
	char tmp[Mac_Size];
	int i;
	
	for(i=0;*tp!='\0';tp++)
	{
		if(*tp==':')
			continue;
		else
			*(tmp+i)=*tp;
		i++;
	}
	*(tmp+i)='\0';
	
	strcpy(dst,tmp);

	return 0;	
}

//it can change the standard long mac addr to standard mac short addr
//--12:12:12:12:12:12 to 121212121212
int better_link_mac(char *dst,char *tp)
{
	char tmp[Mac_Size];
	int count=0;
	int i;
	
	if((tp==NULL)||(strlen(tp)!=Mac_Leng_L))
	{
		strcpy(dst,"");
		return -1;
	}
	
	for(i=0;*tp!='\0';tp++)
		if(*tp==':')
			count+=1;
		else{
			*(tmp+i)=*tp;
			i++;
			}
	*(tmp+i+1)='\0';
		
	if(count!=Mac_Point_C)
	{
		strcpy(dst,"");
		return -1;
	}
	else
		strcpy(dst,tmp);
	
	return 0;
}

//change the 1212121212 to 12:12:12:12:12:12
int div_mac(char * dst,char * tp)
{
	char tmp[Mac_Size];
	int i=1;
	
	if((tp==NULL)||(strlen(tp)!=Mac_Leng_S))
		return -1;
	for(;i<Mac_Leng_L||*tp!='\0';i++)
		if(i%3==0)
			tmp[i]=':';
		else
			tmp[i]=*tp++;
		
	tmp[i]='\0';
	
	strcpy(dst,tmp);
	
	return 0;
}

int main(){
	int i;
	char mac1[Mac_Size]="10:00:00:00:00:01";
	char mac2[Mac_Size]="200000000002";
	char mac3[Mac_Size];
	
	i=div_mac(mac3,mac2);
	
	if(i==-1)
		return -1;
	printf("the mac is %s\n",mac3);
	return 0;
}