Am 09.08.2011 19:33, schrieb Rich Felker:
> On Tue, Aug 09, 2011 at 09:37:58AM +0200, Denys Vlasenko wrote:
>> #define isalnum(a) bb_ascii_isalnum(a)
>> static ALWAYS_INLINE int bb_ascii_isalnum(unsigned char a)
>> {
>> unsigned char b = a - '0';
>> if (b <= 9)
>> return (b <= 9);
>> b = (a|0x20) - 'a';
>> return b <= 'z' - 'a';
>> }
>
> I'm scared to ask why this is written in such an obfuscated way rather
> than just
>
> return a-'0'<10U || (a|32)-'a'<26U;
It could also take a comment as to how EOF is handled... (implicitly
because it wraps to 0xff which is outside the tested ranges) -- and note
it will fail horribly if it's referenced before the definition.
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