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|
=begin
= buffering.rb -- Buffering mix-in module.
Copyright (C) 2001 GOTOU YUUZOU <gotoyuzo@notwork.org>
$IPR: buffering.rb,v 1.13 2001/09/13 16:42:49 gotoyuzo Exp $
=end
module Buffering
include Enumerable
attr_accessor :sync
BLOCK_SIZE = 1024
#
# for reading.
#
private
def fill_rbuff
@rbuffer = "" unless defined? @rbuffer
begin
if self.respond_to?(:to_io)
IO.select([self.to_io], nil, nil)
end
@rbuffer << self.sysread(BLOCK_SIZE)
rescue EOFError
@eof = true
end
end
def consume_rbuff(size=nil)
if @rbuffer.size == 0
@eof = nil
nil
else
size = @rbuffer.size unless size
ret = @rbuffer[0, size]
@rbuffer[0, size] = ""
ret
end
end
public
def read(size=nil)
fill_rbuff unless defined? @rbuffer
until @eof
break if size && size <= @rbuffer.size
fill_rbuff
end
consume_rbuff(size)
end
def gets(eol=$/)
fill_rbuff unless defined? @rbuffer
idx = @rbuffer.index(eol)
until @eof
break if idx
fill_rbuff
idx = @rbuffer.index(eol)
end
if eol.is_a?(Regexp)
size = idx ? idx+$&.size : nil
else
size = idx ? idx+eol.size : nil
end
consume_rbuff(size)
end
def each(eol=$/)
while line = self.gets(eol?)
yield line
end
end
alias each_line each
def readlines(eol=$/)
ary = []
while line = self.gets(eol)
ary << line
end
ary
end
def readline(eol=$/)
raise EOFErorr if eof?
gets(eol)
end
def getc
c = read(1)
c ? c.to_i : nil
end
def each_byte
while c = getc
yield(c)
end
end
def readchar
raise EOFErorr if eof?
getc
end
def ungetc(c)
@rbuffer[0,0] = c.chr
end
def eof?
@eof && @rbuffer.size == 0
end
alias eof eof?
#
# for writing.
#
private
def do_write(s)
@wbuffer = "" unless defined? @wbuffer
@wbuffer << s
if @sync or @wbuffer.size > BLOCK_SIZE or idx = @wbuffer.rindex($/)
remain = idx ? idx + $/.size : @wbuffer.length
nwritten = 0
while remain > 0
nwrote = syswrite(@wbuffer[nwritten,remain])
remain -= nwrote
nwritten += nwrote
end
@wbuffer = ""
end
end
public
def write(s)
do_write(s)
s.length
end
def << (s)
do_write(s)
self
end
def puts(*args)
s = ""
args.each{ |arg| s << arg.to_s + $/ }
do_write(s)
nil
end
def print(*args)
s = ""
args.each{ |arg| s << arg.to_s }
do_write(s)
nil
end
def printf(s, *args)
do_write(s % args)
nil
end
def flush
osync = @sync
@sync = true
do_write ""
@sync = osync
end
def close
flush
sysclose
end
end
|
