linux-kernel - Re: sscanf: implement basic character sets

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Message-ID: <20160226202810.GA6566@packer-debian-8-amd64.digitalocean.com>
Date:	Fri, 26 Feb 2016 15:28:11 -0500
From:	Jessica Yu <jeyu@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Kees Cook <keescook@...omium.org>, linux-kernel@...r.kernel.org
Subject: Re: sscanf: implement basic character sets

+++ Jessica Yu [26/02/16 15:20 -0500]:
>Implement basic character sets for the '%[' conversion specifier.
>
>The '%[' conversion specifier matches a nonempty sequence of characters
>from the specified set of accepted (or with '^', rejected) characters
>between the brackets. The substring matched is to be made up of characters
>in (or not in) the set. This is useful for matching substrings that are
>delimited by something other than spaces.
>
>This implementation differs from its glibc counterpart in the following ways:
>(1) No support for character ranges (e.g., 'a-z' or '0-9')
>(2) The hyphen '-' is not a special character
>(3) The closing bracket ']' cannot be matched
>(4) No support (yet) for discarding matching input ('%*[')
>
>Signed-off-by: Jessica Yu <jeyu@...hat.com>

Since this version is largely based on Rasmus' sample bitmap code
(with only very minor tweaks), what is the best way to provide
attribution in this case? A Suggested-by: tag or another
Signed-off-by: tag (since actual code is involved)?

Thanks,
Jessica