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Function to validate a Unix file name?

P: n/a
Hi,

Can anyone provide a function that can validate if a string would pass
as a valid Unix (specifically Fedora Core 8 Linux) file name? For
example, I'm fairly certain one of the rules is that the file name
cannot contain a "&" character. There are probably a lot of other
rules I don't know about.

Thanks, - Dave
Aug 25 '08 #1
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3 Replies


P: n/a
laredotornado <la***********@zipmail.comwrites:
Hi,

Can anyone provide a function that can validate if a string would pass
as a valid Unix (specifically Fedora Core 8 Linux) file name? For
example, I'm fairly certain one of the rules is that the file name
cannot contain a "&" character. There are probably a lot of other
rules I don't know about.
A unix file name may not contain a slash "/" or a null
character. There are no other limitations, except that many systems
have a maximum filename* length (255 chars seems to be the limit on
ext3).

* paths may be a lot longer since they can contain many filenames.
--
Joost Diepenmaat | blog: http://joost.zeekat.nl/ | work: http://zeekat.nl/
Aug 25 '08 #2

P: n/a
laredotornado wrote:
Can anyone provide a function that can validate if a string would pass
as a valid Unix (specifically Fedora Core 8 Linux) file name? *For
example, I'm fairly certain one of the rules is that the file name
cannot contain a "&" character. *There are probably a lot of other
rules I don't know about.
I would play safe and allow alphanumeric + underscore + minus + dot.

--
Bart
Aug 26 '08 #3

P: n/a
Well, as far as I know all characters except '/' (slash) and null are
allowed. Slash is the directory separator and null is end of string in
C implementation.

However, you should care about special use of certain characters in
shells. Like wildcards '*', '?'...

Also care for character set conversion. JavaScript uses Unicode but
Unix file names usually only use some ISO 8 bit representation which
is different from Unicode representation in many cases.

And regarding implementation of a checking function I recommend a
regular expression.

virtuPIC
--
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Aug 26 '08 #4

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