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Re: %.1s format with vasnprintf reads more than one byte from argument
From: |
Bruno Haible |
Subject: |
Re: %.1s format with vasnprintf reads more than one byte from argument |
Date: |
Fri, 27 Feb 2009 01:27:48 +0100 |
User-agent: |
KMail/1.9.9 |
Eric Blake wrote:
> > +static wchar_t wstring[] = { 'a', 'b', 'c', 0 };
>
> Are we guaranteed that on all platforms, 'a' promotes to L'a'? Or should
> we explicitly write the latter?
It is guaranteed: ISO C 99 paragraph 7.17.(2) says:
"wchar_t
... is an integer type whose range of values can represent distinct codes
for all members of the largest extended character set speciļ¬ed among the
supported locales; the null character shall have the code value zero and
each member of the basic character set shall have a code value equal to its
value when used as the lone character in an integer character constant."
The "basic character set" is defined in section 5.2.1.
In practice, btowc(x) == x for all x in the ASCII range (0 <= x < 128).
> Should we also test that %S serves as a synonym for %ls?
I'd say, it's not useful. %S is specified only in POSIX, not in ISO C99, and
the direvtives are equivalent. Users can use %ls.
Bruno
- %.1s format with vasnprintf reads more than one byte from argument, Ben Pfaff, 2009/02/23
- Re: %.1s format with vasnprintf reads more than one byte from argument, Bruno Haible, 2009/02/23
- Re: %.1s format with vasnprintf reads more than one byte from argument, Ben Pfaff, 2009/02/23
- Re: %.1s format with vasnprintf reads more than one byte from argument, Eric Blake, 2009/02/25
- Re: %.1s format with vasnprintf reads more than one byte from argument, Eric Blake, 2009/02/26
- Re: %.1s format with vasnprintf reads more than one byte from argument, Bruno Haible, 2009/02/26
- Re: %.1s format with vasnprintf reads more than one byte from argument, Eric Blake, 2009/02/26
- Re: %.1s format with vasnprintf reads more than one byte from argument, Bruno Haible, 2009/02/27
- Re: %.1s format with vasnprintf reads more than one byte from argument, Eric Blake, 2009/02/27
- Re: %.1s format with vasnprintf reads more than one byte from argument, Eric Blake, 2009/02/27
- Re: %.1s format with vasnprintf reads more than one byte from argument, Eric Blake, 2009/02/27
- Re: %.1s format with vasnprintf reads more than one byte from argument, Bruno Haible, 2009/02/28
- Re: %.1s format with vasnprintf reads more than one byte from argument, Eric Blake, 2009/02/28