netdev - RE: [PATCH] lib, net: make isodigit public and use it

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Date:	Wed, 10 Apr 2013 14:05:09 +0100
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Denis Kirjanov" <kda@...ux-powerpc.org>,
	"Andy Shevchenko" <andriy.shevchenko@...ux.intel.com>
Cc:	"Jason Baron" <jbaron@...hat.com>, <netdev@...r.kernel.org>,
	"Trond Myklebust" <Trond.Myklebust@...app.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>
Subject: RE: [PATCH] lib, net: make isodigit public and use it

> what about #define isoctal(c) (((c) & ~7) ?

I presume you meant (((c) & ~7) == '0')

Actually the compiler will convert:
    c >= '0' && c <= '7';
into
	(unsigned)(c - '0') <= '7' - '0';
so it makes no significant difference.

Whether adding it to ctype.h is a good idea is a different
problem for the C standards people.

	David




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