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Bug #20416
closedIO#read doesn't change buffer encoding unless `maxlen = nil`
Description
IO#read(nil, buffer)
doesn't change buffer's encoding, but it does when maxlen
parameter is specified:
buffer = "".encode(Encoding::ISO_8859_1)
p File.open("test.rb").read(1000, buffer).encoding # => #<Encoding:ISO-8859-1>
buffer = "".encode(Encoding::ISO_8859_1)
p File.open("test.rb").read(nil, buffer).encoding # => #<Encoding:UTF-8>
I would expect changing buffer encoding in all the cases.
Updated by byroot (Jean Boussier) 7 months ago
Updated by byroot (Jean Boussier) 7 months ago
I git blamed this behavior all the way down to 2007, by @matz (Yukihiro Matsumoto): https://github.com/ruby/ruby/commit/0ca7036682dad1caea4e7a4fe8fd908d94c878e8 and it seems deliberate
* io.c (read_all): should associate default external encoding.
* io.c (io_read): should NOT associate default external encoding.
Updated by nobu (Nobuyoshi Nakada) 5 months ago
The subject should be "IO#read doesn't change buffer encoding unless maxlen = nil
"?
Since IO#read
with maxlen
is byte-oriented operation, there is not an encoding to be set from that IO
.
Updated by byroot (Jean Boussier) 5 months ago
Yeah, I don't think it's a bug. @nobu (Nobuyoshi Nakada) should we close?
Updated by andrykonchin (Andrew Konchin) 5 months ago
- Subject changed from IO#read doesn't preserve buffer encoding if `maxlen = nil` to IO#read doesn't change buffer encoding unless `maxlen = nil`
Updated by mame (Yusuke Endoh) 5 months ago
- Status changed from Open to Closed
Discussed at the dev meeting, and @matz (Yukihiro Matsumoto) agreed with @nobu (Nobuyoshi Nakada). Closing
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