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bufptr = buffer;
void bufwrite(char* p,int n)
{
    while(n>0)
    {
          int k,rem;
          if(bufptr == &buffer[N])
             flushbuffer();
          rem = N - (bufptr - buffer);
          k = n > rem ? rem : n;
          memcpy(bufptr,p,k);
           bufptr += k;
           p += k;
           n -= k;
    }
}
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