From mboxrd@z Thu Jan  1 00:00:00 1970
From: erik quanstrom <quanstro@quanstro.net>
Date: Sat,  9 Mar 2013 09:12:40 -0500
To: 9fans@9fans.net
Message-ID: <c4d896f804a41d50b8f894d4e4f4fd57@brasstown.quanstro.net>
In-Reply-To: <18ADB858-4CC7-4A12-8408-57552185113E@ar.aichi-u.ac.jp>
References: <18ADB858-4CC7-4A12-8408-57552185113E@ar.aichi-u.ac.jp>
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Subject: Re: [9fans] DEL code in file name
Topicbox-Message-UUID: 257ca708-ead8-11e9-9d60-3106f5b1d025

i would think that a more complete solution
would be something like this.  (not tested)
0xff isn't delete, and isn't valid utf.  0x7f is
valid utf, but also not useful in a file name.

- erik

int
checkname(char *s)
{
	int i, n;
	Rune c;

	if(s == nil || *s == 0)
		return Ename;
	if(*s == '.' && (s[1] == 0 || (s[1] == '.' && s[2] == 0)))
		return Edot;
	for(i = 0;; i += n) {
		n = chartorune(&r, s);
		if(i+n >= NAMELEN)
			return Etoolong;
		if(r == 0)
			return 0;
		if(n == 1 && r == Runeerror)
			return Ename;
		if(r <= 040 || r == 0x7f)
			return Ename;
	}
}