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From: Kaz Kylheku <643-408-1753@kylheku.com>
Newsgroups: comp.lang.c
Subject: Re: Something like string-streams existing in "C"?
Date: Thu, 19 Dec 2024 19:47:28 -0000 (UTC)
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On 2024-12-19, BlueManedHawk <bluemanedhawk@invalid.invalid> wrote:
> The ‘asprintf’ subroutine is standardized by POSIX.1-2024, meaning that 
> you can use it now and blame somebody else if it doesn't work.  If you 

Regardless of how it is made visible, you can detect it via a compile
test in a configure script, and provide your own if it wasn't found:

#if !HAVE_ASPRINTF

int asprintf(char **out, const char *fmt, ...)
{
  ... // more or less trivial to implement using malloc, realloc and
  vsprintf
}

#endif

BTW, is there no wchar_t version of this?

> can't target POSIX, the subroutine is also _theoretically_ available 
> through the feature-test macro ‘__STDC_WANT_LIB_EXT2__’, assuming that 
> ‘__STDC_ALLOC_LIB__’ is a predefined macro, but gLibC does not pay 

When would it be the case that you can't target POSIX, but *can* mess
around with some the internal feature test macros of some specific POSIX
vendor? :)


-- 
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