[Bug 3534] probable underflow calculating display width of file name

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3534

--- Comment #12 from Damien Miller <djm at mindrot.org> ---
Created attachment 3679
  --> https://bugzilla.mindrot.org/attachment.cgi?id=3679&action=edit
different approach

Here's a different approach that uses asmprintf() and xextendf() to
build the string, avoiding all the strlen() math.

It's probably safer but makes a few more syscalls and heap operations
per progressmeter update. IMO safety wins here.

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