Umm, that source is just used for UTS (whatever OS that is) presumably because of deficiencies in its native sprintf. A patch would need to be to Perl_sv_vcatpvfn in sv.c.

In reply to Re: Re: (s)printf question: eliminating plus sign before zeros by ysth
in thread (s)printf question: eliminating plus sign before zeros by Not_a_Number

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