Setting a pointer to data

[Brianzor]

I'm writing a ftp in C and am having trouble when copying the file over to the server. When I copy it over, it cuts off the first 512 or so bytes. I need to set a pointer to the data of the file, reading past the filename and then adjust the number of bytes to write. The problem is stemming from function I am using. Here is the code:

int     CopyFile(int  src_sock)
{
    auto    char        buf[BUFLEN];
    auto    FILE        *file;
    auto    ssize_t     nBytes;
    auto    int         count = 0;
    auto    char        fileName[strlen(buf)];

    // get the filename from the client (should be a null-terminated string)
    nBytes = recv(src_sock, buf, BUFLEN, 0);
    if (-1 == nBytes)
        {
        perror("server -- recv failed");
        return FALSE;
        }
    strcpy(fileName, buf);

    // use the filename to open an output file
    file = fopen(buf, "w");

    // set a pointer to the data, and adjust number of bytes to write
    

    // loop and read the rest of the data from the client in 512-byte packets,
    // writing them to the local output file
    while (TRUE)
        {
        nBytes = recv(src_sock, buf, BUFLEN, 0);
        if (-1 == nBytes)
            {
            perror("server -- recv failed");
            return FALSE;
            }
        count += nBytes;
        if (0 == nBytes)
            {
            break;
            }
        printf("client socket = %d -- %d %s transferred\n", src_sock, nBytes, nBytes == 1 ? "byte" : "bytes");
        fwrite(buf, sizeof(char), nBytes, file);
        fseek(file, count, SEEK_SET);
        }

    // close the output file stream
    fclose(file);

    // write a final summary message to stdout
    printf("Data saved in '%s', %d bytes written.\n", fileName, count);
    return TRUE;

}  // end of "CopyFile"

There is a comment about setting a pointer to the data in there. I've tried many different things but none have been working. Any help would be appreciated.

Thanks,
Brian