libc implementations supporting C99 formats

[Robert Lipe]

> > The new SCO UDK for UnixWare and OpenServer purports to support all
> > library but "return value for snprintf(3S) when the destination
> > array is not long enough" and all language features other than
> > complex arithmetic and VLA's.
>
> An obvious sanity check that the printf/scanf may be working C99
> implementations would be to printf an infinity with all eight floating
> point formats (%a %e %f %g %A %E %F %G) and check that it comes out as
> "inf" or "infinity" with the lowercase ones and "INF" or "INFINITY"
> with the uppercase ones (this being the only difference between %f and

I thought you were looking for a "tie breaker" or something. I have no
reason to doubt its degree of conformance. :-) This program yields no
suprises once the output is cut and pasted back to its input.

#include <stdio.h>
#include <math.h>

float x = INFINITY;

main()
{
        float a, b, c, d, e, f, g, h;
        printf("%a %e %f %g %A %E %F %G\n", x, x, x, x, x, x, x, x);
        scanf("%a %e %f %g %A %E %F %G", &a, &b, &c, &d, &e, &f, &g, &h);
        printf("%a %e %f %g %A %E %F %G\n", a, b, c, d, e, f, g, h);

}

> appropriate to include a note that you need library support to use the new
> formats as well as a compiler which understands them with -Wall, and to

Sounds like a good idea to note this.

> indicate something about the availability of such support; subject to any
> limitations on not appearing to promote non-free software it seems it
> would be useful to give some indication of where, apart from glibc 2.2 for
> GNU/Linux and HURD, such formats can be used.

I don't know the precise version number on it, but the SCO UDK for
UnixWare 7 and OpenServer 5 supports the bulk of C99 and seems to have
the specific library support you're asking about.  It was released
fairly recently.

Thanx for asking. 
RJL