Plan 9 from Bell Labs’s /usr/web/sources/patch/applied/acme-look/readme

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This patch corrects "Edit [erw] filename" errors when "filename" is unrooted.
Under this condition the effective file name becomes the entire tag line. (Button 
3 clicking on an unrooted file name in the tag line also fails, but silently.)

The propsed change to dirname() explicitly sets a terminating null for the
unrooted file name case.

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