dev/c/masync_server/int2ip.c

#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

#include <netinet/in.h>
#include <arpa/inet.h>

#include <netdb.h>

static const char *int2ip(unsigned int ip)
{
	static char s[16];
	sprintf(s, "%d.%d.%d.%d", ip >> 24, ip << 8 >> 24, ip << 16 >> 24, ip << 24 >> 24);
	return s;
}

int main(int argc, char *argv[])
{
	if (argc < 2) {
		perror("need hex ip address");
		exit(1);
	}

	unsigned int ip = 0;
	sscanf(argv[1], "%X", &ip);

	printf("%s\n", int2ip(ip));

	return 0;
}