[ruby-core:118183] [Ruby master Bug#20526] File.open(encoding: "bom|utf-8") converts "\r\n" to "\n" on Windows

Issue #20526 has been updated by nobu (Nobuyoshi Nakada).


Probably a bug at push back after BOM look ahead.

BTW, on Windows, `File.write` and `File.read` are in text mode by default.
That file would be 4 bytes, "a\r\r\n" in binary.

----------------------------------------
Bug #20526: File.open(encoding: "bom|utf-8") converts "\r\n" to "\n" on Windows
https://bugs.ruby-lang.org/issues/20526#change-108634

* Author: kou (Kouhei Sutou)
* Status: Open
* Target version: 3.2
* ruby -v: ruby 3.2.2 (2023-03-30 revision e51014f9c0) [x64-mingw-ucrt]
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
I'm not sure whether this is an intentional behavior but it seems that `encoding: "utf-8"` doesn't change newline conversion but `encoding: "bom|utf-8"` changes newline conversion:

```ruby
File.write("a.txt", "a\r\n")
File.read("a.txt").bytes # => [97, 13, 10]
File.open("a.txt", encoding: "utf-8") {|f| f.read.bytes} # => [97, 10, 10]
File.open("a.txt", encoding: "bom|utf-8") {|f| f.read.bytes} # => [97, 10] XXX: \r\n -> \n
File.open("a.txt", encoding: "bom|utf-8", universal_newline: false) {|f| f.read.bytes} # => [97, 13, 10]
```

Note that the `XXX: ` line the above codes. Is this an intentional behavior?



-- 
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/