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private
 
##
# Writes +s+ to the buffer. When the buffer is full or #sync is true the
# buffer is flushed to the underlying socket.
 
def do_write(s)
s = s.dup if s.frozen?
s.force_encoding("ASCII-8BIT")
@wbuffer = "" unless defined? @wbuffer
@wbuffer << s
@sync ||= false
if @sync or @wbuffer.size > BLOCK_SIZE or idx = @wbuffer.rindex($/)
remain = idx ? idx + $/.size : @wbuffer.length
nwritten = 0
while remain > 0
str = @wbuffer[nwritten,remain]
begin
nwrote = syswrite(str)
rescue Errno::EAGAIN
retry
end
remain -= nwrote
nwritten += nwrote
end
@wbuffer[0,nwritten] = ""
end
end
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