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Re: [PATCH] add new module filevercmp

From: Jim Meyering
Subject: Re: [PATCH] add new module filevercmp
Date: Sat, 27 Sep 2008 13:14:31 +0200

Bruno Haible <address@hidden> wrote:
> Jim Meyering wrote:
>> To have any hope of sanity/reproducibility in different locales,
>> this function must return the same result, regardless of the current
>> locale settings.
> Yes. In the opposite case, if the function was to handle non-ASCII letters
> like ASCII letters, it should also have a codepath for multibyte locales.
>> I suggest using this macro in place of ISDIGIT:
>>     #define ISDIGIT(c) ((unsigned int) (c) - '0' <= 9)
> This is equivalent to the c_isdigit macro from "c-ctype.h", assuming the
> normal compiler optimizations. gcc yields identical code for ISDIGIT as for
> c_isdigit.

Good to know.
In that case, of course, it's better to use c_isdigit.

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