From: "YO4 (Yoshinao Muramatsu) via ruby-core" Date: 2026-08-23T14:26:51+00:00 Subject: [ruby-core:126475] [Ruby Bug#20526] File.open(encoding: "bom|utf-8") converts "\r\n" to "\n" on Windows Issue #20526 has been updated by YO4 (Yoshinao Muramatsu). This issue is caused by a combination of two problems. The first is that universal newline is incorrectly enabled when calling `open(name, encoding: "utf-8")`. The second is that, in `io.c`, `io_strip_bom()` uses `rb_io_getbyte()`, which is affected by Bug #21691. As a result, the `rbuf` contains data that has been converted to CRLF by `_read()`, and converting this data using universal newline causes the issue. Fixing the first problem will make `open(name, encoding: "utf-8")` work correctly, but the same problem will remain for `open(name, encoding: "utf-8", universal_newline: true)`. To address the root cause of the second, Bug #21691, I have proposed Bug #21765. The first problem remains the core task of this issue. ---------------------------------------- Bug #20526: File.open(encoding: "bom|utf-8") converts "\r\n" to "\n" on Windows https://bugs.ruby-lang.org/issues/20526#change-118632 * Author: kou (Kouhei Sutou) * Status: Open * Assignee: windows * ruby -v: ruby 3.2.2 (2023-03-30 revision e51014f9c0) [x64-mingw-ucrt] * Backport: 3.1: REQUIRED, 3.2: REQUIRED, 3.3: REQUIRED ---------------------------------------- I'm not sure whether this is an intentional behavior or not 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 in the above codes. Is this an intentional behavior? -- https://bugs.ruby-lang.org/ ______________________________________________ ruby-core mailing list -- ruby-core@ml.ruby-lang.org To unsubscribe send an email to ruby-core-leave@ml.ruby-lang.org ruby-core info -- https://ml.ruby-lang.org/mailman3/lists/ruby-core.ml.ruby-lang.org/