[Bug-tar] mac os x or general charset problem patch

[Heiko Voigt]

Hi,

i had problems with extracting archives on mac os x which were packed 
with a different charset on a linux box. These errors resulted in 
errors like this:

tar: home/sigrid/Office51/database/Adre\337buch.url: Cannot open: (null)

Because this File had the german character 'sz' in its name which is 
only defined in the Latin 1 charset. This resulted in the behaviour 
that open always returned with less than zero.

I implemented a quick and dirty workaround for cases like this which 
i'll attach as a patch. It simply clamps all characters to the 
printable ascii set and replaces nonprintable characters with a 
underscore. This could of course result in the overwriting of other 
files but as i read from the source that should be avoidable with the 
'-k' option or?

cheers Heiko

patch-tar-1.15.1.diff
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