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Link: http://codepad.org/tEcj1ub1    [ raw code | output | fork ]

C, pasted on Apr 15:
#include "stdio.h"

#define U32 unsigned int

U32 atoinet(char *ip_str)
{
    U32 ip = 0;
    int a, b, c, d;

    sscanf(ip_str, "%d.%d.%d.%d", &a, &b, &c, &d);
    ip = a<<24|b<<16|c<<8|d;

    return ip;

}

int is_same_subnet(U32 host, U32 remote, U32 hmask, U32 rmask)
{
    if ((host & hmask) == (remote & rmask))
        return 1;
    else
        return 0; 
}

int is_mcast_ip(U32 ip)
{
    U32 mcast_high = atoinet("224.0.0.0");
    U32 mcast_low  = atoinet("239.255.255.255);

    if (ip <= mcast_high && ip >= mcast_low)
        return 1;
    else
        return 0;
}

int main()
{
    char *hostip = "192.168.2.1";
    char *remote_ip = "192.168.2.10";
    char *host_mask = "255.255.255.0";
    char *remote_mask = "255.255.255.0";
    U32 hip, rip, hmask, rmask; 
    
    hip = atoinet(hostip);
    hmask = atoinet(host_mask);
    rip = atoinet(remote_ip);
    rmask = atoinet(remote_mask);

    

    printf("Host IP: %x\n", hip);
    printf("Neighbor IP: %x\n", rip);
    printf("Host Mask: %x\n", hmask);
    printf("Remote Mask: %x\n", rmask);
    printf("Neighbor IP %s %s\n",
        is_mcast_ip(rip)?"is multicast IP":"not a multicast IP");
    printf("Host and Neighbor in same subnet: %s\n",
           is_same_subnet(hip, rip, hmask, rmask)?"Yes":"No");
    
    return 0;
}


Output:
1
2
3
4
5
In function 'is_mcast_ip':
Line 28: error: missing terminating " character
Line 30: error: expected expression before 'if'
Line 34: error: expected ',' or ';' before '}' token
Line 61: error: expected declaration or statement at end of input


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