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Re: UTF-8 strings in C

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James Kuyper <jameskuyper@alumni.caltech.edu> writes:

> On 1/27/22 06:33, Otto J. Makela wrote:
>
>> ram@zedat.fu-berlin.de (Stefan Ram) wrote:
>>
>>> Here:
>>
>> The end result is exactly the same as with my program,
>> mblen() returns -1.
>>
>> James Kuyper <jameskuyper@alumni.caltech.edu> understood it, I need to
>> ask for the default locale.  I'm a bit stumped as to why so.
>
> Note: while I referred to it as the "default" locale, that's a bad
> term for it, since the "C" locale is the true default:
>
> "At program startup, the equivalent of
> setlocale(LC_ALL, "C");
> is executed."  (7.11.1.1p4)
>
> "... a value of "" for locale specifies the locale-specific native
> environment."  (7.11.1.1p3), so it would be better to call it the
> "native" locale.
>
> "In the "C" locale, isalpha returns true only for the characters for
> which isupper or islower is true."  (7.4.1.2p2)
>
> "In the "C" locale, islower returns true only for the lowercase
> letters (as defined in 5.2.1)."  (7.4.1.7p2)
>
> "In the "C" locale, isupper returns true only for the uppercase
> letters (as defined in 5.2.1)."  (7.4.1.11p2)
>
> "... the 26 _uppercase letters_ of the Latin alphabet
> A B C D E F G H I J K L M
> N O P Q R S T U V W X Y Z
>
> the 26 _lowercase letters_ of the Latin alphabet
> a b c d e f g h i j k l m
> n o p q r s t u v w x y z" (5.2.1p2)
>
> Note that the phrases "uppercase letters" and "lowercase letters"
> are in italics, an ISO convention indicating that the clause in
> which they appear constitutes the official definition for those
> terms within this document.
>
> Thus, isalpha() can only be true in the "C" locale for the 26
> letters of the latin alphabet.  [...]

What I think you mean is that in the "C" locale isalpha() can be
true only for the 26 letters of the latin alphabet.

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Re: UTF-8 strings in C Bonita Montero <Bonita.Montero@gmail.com> - 2022-01-10 07:17 +0100
  Re: UTF-8 strings in C Mateusz Viste <mateusz@xyz.invalid> - 2022-01-10 09:32 +0100
    Re: UTF-8 strings in C Bonita Montero <Bonita.Montero@gmail.com> - 2022-01-10 11:26 +0100
      Re: UTF-8 strings in C Bonita Montero <Bonita.Montero@gmail.com> - 2022-01-10 11:55 +0100
        Re: UTF-8 strings in C Bonita Montero <Bonita.Montero@gmail.com> - 2022-01-10 14:38 +0100
          Re: UTF-8 strings in C om@iki.fi (Otto J. Makela) - 2022-01-14 14:26 +0200
            Re: UTF-8 strings in C om@iki.fi (Otto J. Makela) - 2022-01-14 16:07 +0200
              Re: UTF-8 strings in C Bonita Montero <Bonita.Montero@gmail.com> - 2022-01-14 15:42 +0100
              Re: UTF-8 strings in C Philipp Klaus Krause <pkk@spth.de> - 2022-01-15 09:08 +0100
                Re: UTF-8 strings in C om@iki.fi (Otto J. Makela) - 2022-01-22 11:44 +0200
                Re: UTF-8 strings in C Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2022-01-22 04:48 -0800
                Re: UTF-8 strings in C Richard Damon <Richard@Damon-Family.org> - 2022-01-22 08:27 -0500
                Re: UTF-8 strings in C James Kuyper <jameskuyper@alumni.caltech.edu> - 2022-01-22 14:25 -0500
                Re: UTF-8 strings in C om@iki.fi (Otto J. Makela) - 2022-01-27 13:32 +0200
                Re: UTF-8 strings in C om@iki.fi (Otto J. Makela) - 2022-01-27 13:33 +0200
                Re: UTF-8 strings in C James Kuyper <jameskuyper@alumni.caltech.edu> - 2022-01-27 11:08 -0500
                Re: UTF-8 strings in C Tim Rentsch <tr.17687@z991.linuxsc.com> - 2022-02-03 22:23 -0800
          Re: UTF-8 strings in C Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2022-01-14 04:41 -0800
            Re: UTF-8 strings in C Bonita Montero <Bonita.Montero@gmail.com> - 2022-01-14 14:43 +0100
              Re: UTF-8 strings in C Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2022-01-14 05:45 -0800
                Re: UTF-8 strings in C Mateusz Viste <mateusz@xyz.invalid> - 2022-01-14 15:10 +0100
                Re: UTF-8 strings in C Bonita Montero <Bonita.Montero@gmail.com> - 2022-01-14 15:43 +0100
                Re: UTF-8 strings in C Bart <bc@freeuk.com> - 2022-01-14 15:50 +0000
                Re: UTF-8 strings in C Bonita Montero <Bonita.Montero@gmail.com> - 2022-01-14 17:50 +0100
                Re: UTF-8 strings in C Mateusz Viste <mateusz@xyz.invalid> - 2022-01-14 17:17 +0100
                Re: UTF-8 strings in C Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2022-01-14 08:34 -0800
                Re: UTF-8 strings in C Mateusz Viste <mateusz@xyz.invalid> - 2022-01-14 17:42 +0100
                Re: UTF-8 strings in C Bonita Montero <Bonita.Montero@gmail.com> - 2022-01-14 17:51 +0100
                Re: UTF-8 strings in C Mateusz Viste <mateusz@xyz.invalid> - 2022-01-14 18:07 +0100
                Re: UTF-8 strings in C Bonita Montero <Bonita.Montero@gmail.com> - 2022-01-14 18:19 +0100
                Re: UTF-8 strings in C Tim Rentsch <tr.17687@z991.linuxsc.com> - 2022-02-07 09:02 -0800

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