两个转换IP的函数

[Flamingo]

/*****************************
 * 0xFFFF0000 ==> 255.255.0.0
 ****************************/
int str_aton(const unsigned bip, char *sip)
{
	int count;
	char pa[4];
	unsigned temp;
	unsigned umask = 0xFF;

	memset(pa, 0, 4);
	memset(sip, 0, LIP);

	for (count=3; count>=0; count--){
		temp = umask & bip>>(count*8);
		sprintf(pa, "%i", temp);
		strcat(sip, pa);
		
		if (count != 0){
			strcat(sip, ".");
		}
	}
}
/*****************************
 * 255.255.0.0 ==> 0xFFFF0000
 *****************************/
unsigned bin_aton(const char *sip)
{
	int i;
	int M = 8;
	unsigned umask;
	char str[LIP];

	memcpy(str,sip,LIP);
	umask = atoi(strtok(str,"."))<<3*M;
	
	for (i=2; i>=0; i--){
		umask |= atoi(strtok(NULL,"."))<<i*M;
	}
	return umask;
}

不用我说 , 一看就明白!