[ruby-core:109669] [Ruby master Bug#18973] Kernel#sprintf: %c allows codepoints above 127 for 7-bits ASCII encoding
From:
"mame (Yusuke Endoh)" <noreply@...>
Date:
2022-08-24 20:00:32 UTC
List:
ruby-core #109669
Issue #18973 has been updated by mame (Yusuke Endoh).
I am concerned about compatibility to change this. @naruse proposed to return an ASCII-8BIT string instead of raising an exception.
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Bug #18973: Kernel#sprintf: %c allows codepoints above 127 for 7-bits ASCII encoding
https://bugs.ruby-lang.org/issues/18973#change-98891
* 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 the following behavior:
```ruby
sprintf("%c".encode("US-ASCII"), 128)
=> "\x80"
sprintf("%c".encode("US-ASCII"), 128).valid_encoding?
=> false
```
Specifying codepoints 128-255 for ASCII encoded formatting sequence leads to a broken string.
```ruby
sprintf("%c".encode("US-ASCII"), 255)
=> "\xFF"
sprintf("%c".encode("US-ASCII"), 256)
(irb):17:in `sprintf': 256 out of char range (RangeError)
```
Specifying codepoint greater that 255 causes the expected exception `out of char range`.
I suppose this exception should be raised for codepoints 128-255 as well (for ASCII encoding).
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