linux-kernel - Re: [PATCHv2] fat: don't use custom hex_to

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Message-ID: <87bou5inkk.fsf@devron.myhome.or.jp>
Date:	Wed, 28 Sep 2011 08:15:55 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	Andy Shevchenko <andy.shevchenko@...il.com>
Cc:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	linux-kernel@...r.kernel.org,
	Denys Vlasenko <vda.linux@...glemail.com>
Subject: Re: [PATCHv2] fat: don't use custom hex_to_bin()

Andy Shevchenko <andy.shevchenko@...il.com> writes:

> Actually here we will change endianess.
> So, my question is what endianess is right here? If the original code
> okay, then patch should be rewritten like this:
>
>      rc = hex2bin(op++, ip + 3, 1);
>      if (rc < 0)
>           return -EINVAL;
>
>      rc = hex2bin(op++, ip + 1, 1);
>      if (rc < 0)
>           return -EINVAL;

Original code may work only for little endian. Well, anyway, the output
should be wchar_t (u16) of native endian.

So, I think it should be something like

	u8 uc[2];
	if (hex2bin(uc, ip + 1, 2) < 0)
        	return -EINVAL;
	*(wchar_t *)op = uc[0] << 8 | uc[1];

This should be readable more.

Thanks.
-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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