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bug#24812: 25.1; Missing (binary) radix format directive


From: Alex
Subject: bug#24812: 25.1; Missing (binary) radix format directive
Date: Sat, 29 Oct 2016 13:34:02 -0600
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1 (gnu/linux)

Alex <address@hidden> writes:

> Emacs' `format' has %o, %x, and %d, but it's missing both the ~r and ~b
> radix directives from Common Lisp's `format'.
>
> I can understand leaving out ~r, but I think ~b is worth adding to
> Emacs' `format'.
>
> CL example:
> (format nil "~b" 5) => "101"
>
> Requested:
> (format "%b" 5) => "101"

I noticed that while string_to_number supports an arbitrary base,
number_to_string doesn't.

If number_to_string was symmetric in this aspect, then ~b and ~r should
be straightforward to implement, right?





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