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:117620] [Ruby master Bug#20439] Invalid string format with n$ flag is ignored in some case
Date: Fri, 19 Apr 2024 16:08:52 +0000 (UTC) [thread overview]
Message-ID: <redmine.issue-20439.20240419160852.10330@ruby-lang.org> (raw)
In-Reply-To: redmine.issue-20439.20240419160852.10330@ruby-lang.org
Issue #20439 has been reported by tompng (tomoya ishida).
----------------------------------------
Bug #20439: Invalid string format with n$ flag is ignored in some case
https://bugs.ruby-lang.org/issues/20439
* 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
----------------------------------------
String format including n$ flag and no type specifier raises ArgumentError
~~~ruby
"%1$ " % 1 # invalid format character - % (ArgumentError)
"%1$," % 1 # malformed format string - %, (ArgumentError)
~~~
But when it ends with n$ flag, or the next char to n$ flag is `"\n"` or `"\0"`, there is no error. Returns string with n$ flag removed.
~~~ruby
"%1$\n" % 1 #=> "%\n"
"%1$\0" % 1 #=> "%\u0000"
"%1$" % 1 #=> "%"
~~~
--
https://bugs.ruby-lang.org/
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parent reply other threads:[~2024-04-19 16:09 UTC|newest]
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