Re: Handling numbers input/output in glibc

[Behdad Esfahbod <behdad at cs dot toronto dot edu>]

Please ignore my last mail.  It definitely means that only ASCII
digits are decimal digits.

Sorry for the extra noise,
behdad


On Tue, 27 Jan 2004, Behdad Esfahbod wrote:

> On Thu, 22 Jan 2004, Bruno Haible wrote:
>
> > Behdad Esfahbod wrote:
> > > Does it mean the same about iswdigit()?
> >
> > Yes. The ISO C 99 description of iswdigit(), section 7.25.2.1.5, is:
> >
> >   "The iswdigit function tests for any wide character that corresponds to
> >    a decimal-digit character (as defined in 5.2.1)."
> >
> > See also the comment in glibc/localedata/gen-unicode-ctype.c function
> > is_digit().
> >
> > Bruno
>
> Thanks Bruno for the reply.  The comment in gen-unicode-ctype.c
> quotes the same part from C99 and this part:
>
>      5.2.1:
>         the 10 decimal digits 0 1 2 3 4 5 6 7 8 9
>
> But as I wrote in my original long mail, I think this is a
> misunderstanding.  Please read these two clauses:
>
> """
> 5.2.1  Character sets
>
> 1  Two sets of characters and their associated collating
> sequences shall be defined: the set in which source files are
> written (the source character set), and the set interpreted in
> the execution environment (the execution character set).  Each
> set is further divided into a basic character set, whose contents
> are given by this subclause, and a set of zero or more
> locale-specific members (which are not members of the basic
> character set) called extended characters.  The combined set is
> also called extended character set.  The calues of the members of
> the execution character set are implementation-defined.
>
> 3 Both the basic source and basic execution character sets shall
> have the following members: the 26 uppercase letters of the Latin
> alphabet ..., the 26 lowercase letters of the Latin alphabet ...,
> the 10 decimal digits ..., the following 29 graphic characters
> ....
> """
>
> So I mean, I don't really say this clause is saying that only the
> ASCII digits should be recognized as decimal digits.  These are
> the basic decimal digits, while extended ones are locale-specific.
> You may say it says '"the" decimal digits', and I have nothing
> more to say.
>
> Yours,
> behdad
>