From: "tompng (tomoya ishida) via ruby-core" <ruby-core@ml.ruby-lang.org>
To: ruby-core@ml.ruby-lang.org
Cc: "tompng (tomoya ishida)" <noreply@ruby-lang.org>
Subject: [ruby-core:117619] [Ruby master Bug#20438] String format "%\n" and "%\0" does not raise format error
Date: Fri, 19 Apr 2024 16:06:51 +0000 (UTC) [thread overview]
Message-ID: <redmine.issue-20438.20240419160650.10330@ruby-lang.org> (raw)
In-Reply-To: redmine.issue-20438.20240419160650.10330@ruby-lang.org
Issue #20438 has been reported by tompng (tomoya ishida).
----------------------------------------
Bug #20438: String format "%\n" and "%\0" does not raise format error
https://bugs.ruby-lang.org/issues/20438
* Author: tompng (tomoya ishida)
* Status: Open
* ruby -v: ruby 3.3.0 (2023-12-25 revision 5124f9ac75) +YJIT +MN [arm64-darwin22]
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
`"%" % 1` raises `incomplete format specifier; use %% (double %) instead`
`"%=" % 1` raises `malformed format string - %=`.
But `"%\n" % 1` `"%\0" % 1` does not raise error.
In `sprintf.c`, `\n` and `\0` are explicitly accepted. Is this expected?
Some other language are:
Perl: Warns `Invalid conversion in printf`. Just prints. `"%d% " → "1% "`
Python: Error `ValueError: unsupported format character '?' (0xa)` with `print("%\n" % 123)`
PHP: Error `Unknown format specifier` with `sprintf("%\n", 3)`
C, C++: Warns `incomplete format specifier`. `"%\n" → "\n"`, `"%" → ""`, `"% " → ""`
`sprintf("%f%\n",x)` and `"%f%\n" % x` is used in some codes https://github.com/search?q=language%3ARuby+%22f%25%5Cn%22&type=code
--
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/postorius/lists/ruby-core.ml.ruby-lang.org/
next parent reply other threads:[~2024-04-19 16:07 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-19 16:06 tompng (tomoya ishida) via ruby-core [this message]
2024-04-22 4:49 ` [ruby-core:117639] [Ruby master Bug#20438] String format "%\n" and "%\0" does not raise format error nobu (Nobuyoshi Nakada) via ruby-core
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-list from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: https://www.ruby-lang.org/en/community/mailing-lists/
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=redmine.issue-20438.20240419160650.10330@ruby-lang.org \
--to=ruby-core@ruby-lang.org \
--cc=noreply@ruby-lang.org \
--cc=ruby-core@ml.ruby-lang.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).