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Bug #8625

closed

IO#read(len, buf) shortens buf even if data is not read actually

Added by no6v (Nobuhiro IMAI) almost 11 years ago. Updated almost 10 years ago.

Status:
Closed
Assignee:
nobu (Nobuyoshi Nakada)
Target version:
-
ruby -v:
ruby 2.1.0dev (2013-07-11 trunk 41923) [x86_64-linux]
Backport:
2.0.0: DONE, 2.1: DONE
[ruby-core:55951]

Description

By r34580, IO#read(len, buf) does not expand buf until data is read actually,
but it still shortens if the original buf size is greater than len.
Is this an intended behavior?

def m(s)
  IO.pipe do |r, w|
    t = Thread.new{r.read(2, s)}
    Thread.pass until t.stop?
    t.kill
    t.value
  end
end

(1..3).each do |len|
  s = "x" * len
  s # => "x", "xx", "xxx"
  m(s)
  s # => "x", "xx", "xx"
end
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