mac2addr.c

一些linux基本函数的测试集,给像我一样的新手看看

//运行结果:把一个六位char数组,转换成mac地址形式的字符串.
//比如:{0xac,0x6c,0x5c,0x4d,0x12,0x0}-->"ac:6c:5c:4d:12:00".

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

char *mac2addr(unsigned char device_mac[])
{
	char mac[18],tmp[3];
	int i;
	memset(mac,0,18);
	if(device_mac[0]<16)
		sprintf(mac,"0%x",device_mac[0]);
	else
		sprintf(mac,"%x",device_mac[0]);
	for(i=1;i<6;i++)
	{
		memset(tmp,0,3);
		if(device_mac[i]<16)
		{
			sprintf(tmp,":0%x",device_mac[i]);
		}
		else
			sprintf(tmp,":%x",device_mac[i]);

		strcat(mac,tmp);
	}
	
	printf("%x:%x:%x:%x:%x:%x\n",device_mac[0],device_mac[1],device_mac[2],device_mac[3],device_mac[4],device_mac[5]);
	return strdup(mac);
}

int main()
{
	unsigned char i[6]={0xac,0x6c,0x5c,0x4d,0x12,0x0};
	char *str;
	printf("%x:%x:%x:%x:%x:%x\n",i[0],i[1],i[2],i[3],i[4],i[5]);
	str=mac2addr(i);
	
	//free(str);
	printf("the result mac is:%s\n",str);
	
	return 1;
}