Bug #12340: Windows: File.truncate has two string encoding issues

• Status: Closed
• Assignee: -
• Target version: -
• Backport: 2.1: WONTFIX, 2.2: DONE, 2.3: DONE

[cremno (cremno phobia)]

File.truncate calls rb_str_encode_ospath() which returns a UTF-8 encoded Ruby string.
Then it passes a pointer to the underlying C string to truncate() aka rb_w32_truncate().
At last the UTF-8 string is passed to CreateFile() aka CreateFileA() (ANSI).

This also means it doesn't support Unicode unlike (hopefully all) other File singleton methods.

s = "\u2603"
IO.write(s, '123')
File.truncate(s, 0)  # Errno::ENOENT: No such file or directory @ rb_file_s_truncate - ☃

A possible fix is attached. I'm not sure about the test code. I also couldn't find any similar tests. The actual fix should be fine however.

[usa (Usaku NAKAMURA)]

• Status changed from Open to Closed

Applied in changeset r54887.

---

• test/ruby/test_file_exhaustive.rb: test UTF-8 filename. see [Bug #12340]

[usa (Usaku NAKAMURA)]

• Backport changed from 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN to 2.1: WONTFIX, 2.2: REQUIRED, 2.3: REQUIRED

I can't find your attached file :-P, but I've fixed now.

[cremno (cremno phobia)]

Oops! The tests you've added are much more comprehensive than mine anyway. Thank you for the quick fix.

[usa (Usaku NAKAMURA)]

• Backport changed from 2.1: WONTFIX, 2.2: REQUIRED, 2.3: REQUIRED to 2.1: WONTFIX, 2.2: DONE, 2.3: REQUIRED

ruby_2_2 r55347 merged revision(s) 54887-54889.

[nagachika (Tomoyuki Chikanaga)]

• Backport changed from 2.1: WONTFIX, 2.2: DONE, 2.3: REQUIRED to 2.1: WONTFIX, 2.2: DONE, 2.3: DONE

ruby_2_3 r55400 merged revision(s) 54887-54889.