linux-kernel - Re: [x86 setup 20/33] Console-writing code for the new x86 setup code

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Date:	Tue, 10 Jul 2007 11:48:03 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jan Engelhardt <jengelh@...putergmbh.de>
CC:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	andi@...stfloor.org, akpm@...ux-foundation.org
Subject: Re: [x86 setup 20/33] Console-writing code for the new x86 setup
 code

Jan Engelhardt wrote:
> On Jul 9 2007 19:51, H. Peter Anvin wrote:
>> +
>> +static inline int isdigit(int ch)
>> +{
>> +	return (ch >= '0') && (ch <= '9');
>> +}
> 
> I'd say static inline unsigned int isdigit(unsigned char), since ASCII does not
> realistically exceed 255.

If you're trying to be standard, you're doing the wrong thing (the
standard is int, since -1 is a permitted value.)

It doesn't matter anyway, and your version would probably generate
slightly worse code.

>> +static int strnlen(const char *s, int maxlen)
> 
> unsigned int,  and               unsigned int, too?
> The glibc strnlen type also uses unsigned types.

If anything it should be size_t.  Fixing, and moved to string.c, where
it belongs.

	-hpa
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