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|
=begin
= $RCSfile$ -- Buffering mix-in module.
= Info
'OpenSSL for Ruby 2' project
Copyright (C) 2001 GOTOU YUUZOU <gotoyuzo@notwork.org>
All rights reserved.
= Licence
This program is licenced under the same licence as Ruby.
(See the file 'LICENCE'.)
= Version
$Id$
=end
module Buffering
include Enumerable
attr_accessor :sync
BLOCK_SIZE = 1024*16
def initialize(*args)
@eof = false
@rbuffer = ""
@sync = @io.sync
end
#
# for reading.
#
private
def fill_rbuff
begin
@rbuffer << self.sysread(BLOCK_SIZE)
rescue Errno::EAGAIN
retry
rescue EOFError
@eof = true
end
end
def consume_rbuff(size=nil)
if @rbuffer.empty?
nil
else
size = @rbuffer.size unless size
ret = @rbuffer[0, size]
@rbuffer[0, size] = ""
ret
end
end
public
def read(size=nil, buf=nil)
if size == 0
if buf
buf.clear
return buf
else
return ""
end
end
until @eof
break if size && size <= @rbuffer.size
fill_rbuff
end
ret = consume_rbuff(size) || ""
if buf
buf.replace(ret)
ret = buf
end
(size && ret.empty?) ? nil : ret
end
def readpartial(maxlen, buf=nil)
if maxlen == 0
if buf
buf.clear
return buf
else
return ""
end
end
if @rbuffer.empty?
begin
return sysread(maxlen, buf)
rescue Errno::EAGAIN
retry
end
end
ret = consume_rbuff(maxlen)
if buf
buf.replace(ret)
ret = buf
end
raise EOFError if ret.empty?
ret
end
def gets(eol=$/, limit=nil)
idx = @rbuffer.index(eol)
until @eof
break if idx
fill_rbuff
idx = @rbuffer.index(eol)
end
if eol.is_a?(Regexp)
size = idx ? idx+$&.size : nil
else
size = idx ? idx+eol.size : nil
end
if limit and limit >= 0
size = [size, limit].min
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=$/)
raise EOFError if eof?
gets(eol)
end
def getc
c = read(1)
c ? c[0] : nil
end
def each_byte
while c = getc
yield(c)
end
end
def readchar
raise EOFError if eof?
getc
end
def ungetc(c)
@rbuffer[0,0] = c.chr
end
def eof?
fill_rbuff if !@eof && @rbuffer.empty?
@eof && @rbuffer.empty?
end
alias eof eof?
#
# for writing.
#
private
def do_write(s)
@wbuffer = "" unless defined? @wbuffer
@wbuffer << s
@sync ||= false
if @sync or @wbuffer.size > BLOCK_SIZE or idx = @wbuffer.rindex($/)
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
public
def write(s)
do_write(s)
s.length
end
def << (s)
do_write(s)
self
end
def puts(*args)
s = ""
if args.empty?
s << "\n"
end
args.each{|arg|
s << arg.to_s
if $/ && /\n\z/ !~ s
s << "\n"
end
}
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 rescue nil
sysclose
end
end
|
