* [ruby-core:25451] [Bug #2057] Strange behavior IO#ungetc at the beginning of the stream
@ 2009-09-07 6:06 Yuki Sonoda
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From: Yuki Sonoda @ 2009-09-07 6:06 UTC (permalink / raw
To: ruby-core
Bug #2057: Strange behavior IO#ungetc at the beginning of the stream
http://redmine.ruby-lang.org/issues/show/2057
Author: Yuki Sonoda
Status: Open, Priority: Normal
ruby -v: ruby 1.8.6 (2008-08-11 patchlevel 287) [i386-mswin32]
Issue cloned from #1909.
--
This works:
io = File.open("a.txt", "r+")
io.read(0)
p io.pos # => 0
io.ungetc(100)
p io.pos # => 0
while this doesn't:
io = File.open("a.txt", "r+")
p io.pos # => 0
io.ungetc(100) # => unread stream (IOError)
I would expect the first case to raise the same error as the second one since ungetc is supposed to shift the position back by 1 and we are at the beginning of the stream.
In ruby 1.9.1p129 (2009-05-12 revision 23412) [i386-mswin32] neither case raises an exception, which is at least consistent but still weird.
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http://redmine.ruby-lang.org
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