From: "andrykonchin (Andrew Konchin)" <noreply@...>
Date: 2022-08-06T11:54:57+00:00
Subject: [ruby-core:109431] [Ruby master Bug#18958] Kernel#sprintf doesn't apply format sequence in some encodings

Issue #18958 has been reported by andrykonchin (Andrew Konchin).

----------------------------------------
Bug #18958: Kernel#sprintf doesn't apply format sequence in some encodings
https://bugs.ruby-lang.org/issues/18958

* Author: andrykonchin (Andrew Konchin)
* Status: Open
* Priority: Normal
* ruby -v: 3.0.3
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
I've noticed that `sprintf` does nothing (at least for `%f`) when format string is in the following encodings:

- UTF-16
- UTF-16BE
- UTF-16LE
- UTF-32
- UTF-32BE
- UTF-32LE
- UCS-2BE
- UCS-4BE
- UCS-4LE
- IBM037
- ebcdic-cp-us

Example:

```ruby
format = "%10.4f".encode("UTF-32")
sprintf(format, 12.34)
# => "\uFEFF%10.4f"

```




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