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Fixes #5870
sscanf()
returns:null
when input string is empty and no out variables provided: https://3v4l.org/2OfgdClist
with nulls for unmatched specifiers: https://3v4l.org/Njvgfnull
for out variables corresponding to unmatched specifiers and the number of matched specifiers as a return value: https://3v4l.org/8OZMk-1
when input string is empty and out variables are provided: https://3v4l.org/qq1Al