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I found the documentation for -dprintf-insert a bit unclear. It didn't mention the possibility of multiple arguments, and I also noticed that it implied that the format parameter is optional, which it is not. While looking into this I also noticed a few comments in the implementation that could also be improved. Then, I noticed a repeated call to strlen in a loop condition, so I fixed this up as well. Reviewed-By: Eli Zaretskii <eliz@gnu.org>