/// <summary>Reads from the stdin reader, unbuffered, until the specified condition is met.</summary>
private static unsafe void ReadStdinUnbufferedUntil(
StdInStreamReader reader,
byte* buffer, int bufferSize,
ref int bytesRead, ref int pos,
Func<byte, bool> condition)
{
while (true)
{
for (; pos < bytesRead && !condition(buffer[pos]); pos++) ;
if (pos < bytesRead) return;
bytesRead = reader.ReadStdinUnbuffered(buffer, bufferSize);
pos = 0;
}
}