Re: Implemenation Indepdent Way to Move LSByte of Char to MSB of Int, etc

From: bd (bdonlan_at_gmail.com)
Date: 01/17/05

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Date: Mon, 17 Jan 2005 15:00:53 -0500

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Eric Sosman wrote:

[...]
> Maybe there's a way to calculate (UINT_MAX + 1)/(UCHAR_MAX + 1)
> without risking zero in the numerator and/or denominator, but I
> haven't figured one out. (Note that UCHAR_MAX == ULLONG_MAX is
> permitted by the Standard.)

Since UCHAR_MAX <= UINT_MAX <= ULLONG_MAX...

#if UCHAR_MAX == ULLONG_MAX
# define UINT_UCHAR_RATIO 1
#else
# define UINT_UCHAR_RATIO \
(((unsigned long long)UINT_MAX + 1) / \
((unsigned long long)UCHAR_MAX + 1))
#endif

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