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http://en.wikipedia.org/wiki/Binary_file

I think the following serves ur purpose if any thing again is wrong with that pls correct me , actually i just typed that code in a hurry that's the reason..
char * prep_string();

int main()
{...

I think you need to create a string at run time .And if that is the case you could use following code

int prep_string(char *);

int main()
{
char *str; // The dynamicallly allocated string...

There is a good article on wikipedia on this topic that explains client server(two tier mode) and multi tier modes also .You could find it here Two tier client server modal...