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Output of file(1) (lemmy.sdf.org)

submitted 9 months ago by [email protected] to c/[email protected]

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Hello, I've tried to find someone else using OpenBSD in various places for a while now, but with no success, so I'm hoping someone will read this.

I'm wondering what your output is from file(1) on a file you know has text encoded as UTF-8.

On my system (7.3-stable) the output is "Non-ISO extended-ASCII text", and I'm trying to figure out if this is how it should be, or if I did something wrong setting up the system.

So, if you have a computer with OpenBSD and a minute to spare, could you try running file(1) on a UTF-8 file and see if it identifies it as UTF-8 or "Non-ISO extended-ASCII text"?

Thanks in advance

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[–] [email protected] 2 points 9 months ago (1 children)

Yep I have the same result so most likely you didn't do anything wrong. My VPS on openbsd.amsterdam shows this and my laptop does too.

[–] [email protected] 2 points 9 months ago (1 children)

Aha, I understand, thank you! file(1) might not be utf8 aware yet then.

[–] [email protected] 1 points 9 months ago (2 children)

I explored the source of file(1) and the part to determine file types of text file seems to be in text.c: https://cvsweb.openbsd.org/cgi-bin/cvsweb/~checkout~/src/usr.bin/file/text.c?rev=1.3&content-type=text/plain

And especially this part:

static int
text_try_test(const void *base, size_t size, int (*f)(u_char))
{
	const u_char	*data = base;
	size_t		 offset;

	for (offset = 0; offset &lt; size; offset++) {
		if (!f(data[offset]))
			return (0);
	}
	return (1);
}

const char *
text_get_type(const void *base, size_t size)
{
	if (text_try_test(base, size, text_is_ascii))
		return ("ASCII");
	if (text_try_test(base, size, text_is_latin1))
		return ("ISO-8859");
	if (text_try_test(base, size, text_is_extended))
		return ("Non-ISO extended-ASCII");
	return (NULL);
}

So file(1) is not capable of saying if a file is UTF-8 right now. There is some other file (/etc/magic) which can help to determine if a text file is UTF-7 or UTF-8-EBCDIC because those need a BOM but as you said UTF-8 does not need a BOM. So it looks like we are stuck here :)

[–] [email protected] 1 points 8 months ago (1 children)

Which is ironic, given that OpenBSD only supports the UTF-8 encoding :)

[–] [email protected] 1 points 8 months ago

Yes it looks like utf8 is a first-class citizen but really it is ASCII which is 100% supported. From the FAQ:

The OpenBSD base system fully supports the ASCII character set and encoding, and partially supports the UTF-8 encoding of the Unicode character set.

[–] [email protected] 1 points 9 months ago

Thank you. At least I know now that it's the expected output of utf-8 files, that's good to know. Thank you again.