Determine if a string is a valid IPv4 address in C

Question

What would be a good way to determine if a string contains an IPv4 address? Should I use isdigit()?

Answer 1

Try this code :

int ipValid(char *ip) {
int i,j,start,dotcount=0,x=0,end,c=0;
int n= strlen(ip);
start=0;
for(i=0;i=0&&x<=255)
        {
            if(i==n-1)
                break;
            else
                start=i+1;
        }
        else
        {
            return 0;
        }
    }
}
if(dotcount==3)
   return 1;
else
   return 0;}