[ruby-core:118164] [Ruby master Bug#20416] IO#read doesn't preserve buffer encoding if `maxlen = nil`

Issue #20416 has been updated by nobu (Nobuyoshi Nakada).


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`.

----------------------------------------
Bug #20416: IO#read doesn't preserve buffer encoding if `maxlen = nil`
https://bugs.ruby-lang.org/issues/20416#change-108604

* Author: andrykonchin (Andrew Konchin)
* Status: Open
* ruby -v: 3.3.0
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
`IO#read(nil, buffer)` doesn't change buffer's encoding, but it does when `maxlen` parameter is specified:

```ruby
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.



-- 
https://bugs.ruby-lang.org/
 ______________________________________________
 ruby-core mailing list -- [e-mail]
 To unsubscribe send an email to [e-mail]
 ruby-core info -- https://ml.ruby-lang.org/mailman3/postorius/lists/ruby-core.ml.ruby-lang.org/