C语言字符串IP转4字节

#include <stdio.h>
#include <string.h>

void str2ip(char *in, unsigned char *out)
{
	int i;
	int tmp[4]={0};
	sscanf(in, "%d.%d.%d.%d", tmp, tmp + 1, tmp + 2, tmp + 3);
	for (i = 0; i < 4; i++)
	{
		out[i] = tmp[i] & 0xff;
	}
}

int main()
{
	char *in = "192.168.1.1";
	unsigned char out[4];
	str2ip(in, out);
	printf("\n%d.%d.%d.%d\n", out[0], out[1], out[2], out[3]);
}