Re: C23 thoughts and opinions

Michael S <already5chosen@yahoo.com> writes:

On Fri, 24 May 2024 06:54:35 -0700
Tim Rentsch <tr.17687@z991.linuxsc.com> wrote:
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Michael S <already5chosen@yahoo.com> writes:
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On Thu, 23 May 2024 17:37:39 -0700
Tim Rentsch <tr.17687@z991.linuxsc.com> wrote:
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Michael S <already5chosen@yahoo.com> writes:
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[...]  Just want to say that strfrom* family is long overdue, but
still appear incomplete.  The guiding principle should be that all
format specifiers available in printf() with sole exception of %s
should be provided as strfrom* as well.

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What's the motivation for having separate functions?  To me this
looks like creeping featuritis.

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My practical motivation is space-constrained environments, where I
possibly want one or two or three formatters.  sprintf() gives me
all or nothing and all can be too expensive.  Many embedded
environments have big and small variants of sprintf that can be
chosen at link time, but what's in small variant does not
necessarily match a set that I want in my specific project.  And is
not necessarily well documented.

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Okay, I see now where you're coming from, although I'm not sure that
the strfrom*() functions will give you what you want (in terms of
memory footprint, etc).  But I get your motivation.
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Question:  which of the four formats (%A, %E, %F, %G) are ones you
expect to use?

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Rarely: any of those,  mostly for debugging.
In productioon code: %e is most likely, but %f could happen.

If you can get by without %g, I recommend writing your own.  The
effort needed isn't trivial but it isn't impossibly large either.
(If you really need %g that's a whole other kettle of fish... and
really old smelly fish at that. :)

But it's not just a floating point.  "Small" variants of sprintf()
on 32-bit platforms often unable to handle %lld and %llu.

Here again, just write them.  Easy as falling off a log.

 Also I'm curious:  do all of your target platforms
use IEEE floating point, or do some use other representations?

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Currently, only IEEE.  [...]

My comments above are predicated on being able to count on
floating point being in IEEE format.

Oh, if you want more information about this, please feel free
to email me.