/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #include <u.h>#include <libc.h> /* * /adm/users is *	id:user/group:head member:other members * * /etc/{passwd,group} *	name:x:nn:other stuff */ static int isnumber(char *s); sniff(Biobuf *b){	read first line of file into p; 	nf = getfields(p, f, nelem(f), ":");	if(nf < 4)		return nil; 	if(isnumber(f[0]) && !isnumber(f[2]))		return _plan9; 	if(!isnumber(f[0]) && isnumber(f[2]))		return _unix; 	return nil;}  intisnumber(char *s){	char *q; 	strtol(s, &q, 10);	return *q == '\0';} /* EOF */