Extract Octets from Ip/ Fomrat Ip address from string using C program

/*C program to format/extract ip address octets.*/

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

/*
Function : extractIpAddress
Arguments : 
1) sourceString - String pointer that contains ip address
2) ipAddress - Target variable short type array pointer that will store ip address octets
*/
void extractIpAddress(unsigned char* sourceString, short* ipAddress)
{
    unsigned short len = 0;
    unsigned char oct[4] = { 0 }, cnt = 0, cnt1 = 0, i, buf[5];

    len = strlen(sourceString);
    for (i = 0; i < len; i++) {
        if (sourceString[i] != '.') {
            buf[cnt++] = sourceString[i];
        }
        if (sourceString[i] == '.' || i == len - 1) {
            buf[cnt] = '\0';
            cnt = 0;
            oct[cnt1++] = atoi(buf);
        }
    }
    ipAddress[0] = oct[0];
    ipAddress[1] = oct[1];
    ipAddress[2] = oct[2];
    ipAddress[3] = oct[3];
}

int main()
{
    unsigned char ip[] = { 0 };
    short ipAddress[4];

    printf("Enter IP Address (xxx.xxx.xxx.xxx format): ");
    gets(ip);

    extractIpAddress(ip, &ipAddress[0]);

    printf("\nIp Address: %03d. %03d. %03d. %03d\n", ipAddress[0], ipAddress[1], ipAddress[2], ipAddress[3]);

    return 0;
}

Output:

Enter IP Address (xxx.xxx.xxx.xxx format): 167.78.190.091 

Ip Address: 167. 078. 190. 091