write an array of unspecified size to a file

how do i loop until this is done?
the way it is written currently, it only writes the first 512 characters. how can i make it loop until it writes the whole file? i think i need some kind of loop in my writer code section where i have set up the while loop that i dont know how to fill in. any ideas?




//reader

Code:

#include <iostream>
#include <fstream>
using namespace std;

int main(int argc, char *argv[])
{
        cout << "in reader" << endl;
        char readbuffer[512];
        int ipipe = atoi(argv[2]);
        ifstream ifs(argv[1]);

        while (!ifs.eof())
        {
                ifs.read(readbuffer, sizeof(readbuffer));
                write(ipipe, readbuffer, ifs.gcount());
        }

        close(ipipe);


        return 0;
}

//writer

Code:

#include <iostream>
#include <fstream>
using namespace std;

int main(int argc, char *argv[])
{
        cout << "in writer" << endl;
        char writebuffer[512];
        int rc;
        int ipipe = atoi(argv[2]);
        ofstream ofs(argv[1]);


        while (?)
        {
            rc = read(ipipe, writebuffer, sizeof(writebuffer));
            ofs.write(writebuffer, rc);
        }

        close(ipipe);



        return 0;
}

while read() returns >0 result.

Originally Posted by Salem

while read() returns >0 result.

i tried

Code:

do
{
      //do code
}while (rc>0);

but my output file was overwritten with nothingness which means it must have written past the end of the file. how can i correct this?

nvm, i got it. you put me on the right track though, thank you