Re: [PATCH] scanf.3: Do not mention the ERANGE error

[Alejandro Colomar <alx.manpages@gmail.com>]

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On 12/14/22 11:52, Ian Abbott wrote:
>>>
>>> '@' isn't included in C's basic character set though.  '&' is available.
>>
>> Just a curious question from an ignorant:  what's the difference between the 
>> basic character set and the source character set?
> 
> The source character set may contain locale-specific characters outside the 
> basic source character set.
> 
> Actually, there are two basic character sets - the basic source character set 
> and the basic execution character set (which includes the basic source character 
> set plus a few control characters).  The source character set and/or execution 
> character set may contain locale-specific, extended characters outside the basic 
> character set.
> 
> https://port70.net/~nsz/c/c11/n1570.html#5.2.1

I still have a small doubt.  C23 added '@' to the source character set, but 
seems to be a second-class citizen:



  The execution character set may also contain multibyte characters, which
need not have the same encoding as for the source character set. For both 
character sets, the following
shall hold:
— The basic character set, @, $, and ` shall be present and each character shall 
be encoded as a
single byte.



What's the difference, and why isn't it part of the basic character set?  Maybe 
because not all keyboards have those three characters?
> 

-- 
<http://www.alejandro-colomar.es/>

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