1 7285a491 2004-06-17 devnull #include <u.h>
 2 7285a491 2004-06-17 devnull #include <libc.h>
 3 7285a491 2004-06-17 devnull 
 4 7285a491 2004-06-17 devnull /*
 5 7285a491 2004-06-17 devnull  * /adm/users is
 6 7285a491 2004-06-17 devnull  *	id:user/group:head member:other members
 7 7285a491 2004-06-17 devnull  *
 8 7285a491 2004-06-17 devnull  * /etc/{passwd,group}
 9 7285a491 2004-06-17 devnull  *	name:x:nn:other stuff
10 7285a491 2004-06-17 devnull  */
11 7285a491 2004-06-17 devnull 
12 7285a491 2004-06-17 devnull static int isnumber(char *s);
13 7285a491 2004-06-17 devnull 
14 7285a491 2004-06-17 devnull sniff(Biobuf *b)
15 7285a491 2004-06-17 devnull {
16 7285a491 2004-06-17 devnull 	read first line of file into p;
17 7285a491 2004-06-17 devnull 
18 7285a491 2004-06-17 devnull 	nf = getfields(p, f, nelem(f), ":");
19 7285a491 2004-06-17 devnull 	if(nf < 4)
20 7285a491 2004-06-17 devnull 		return nil;
21 7285a491 2004-06-17 devnull 
22 7285a491 2004-06-17 devnull 	if(isnumber(f[0]) && !isnumber(f[2]))
23 7285a491 2004-06-17 devnull 		return _plan9;
24 7285a491 2004-06-17 devnull 
25 7285a491 2004-06-17 devnull 	if(!isnumber(f[0]) && isnumber(f[2]))
26 7285a491 2004-06-17 devnull 		return _unix;
27 7285a491 2004-06-17 devnull 
28 7285a491 2004-06-17 devnull 	return nil;
29 7285a491 2004-06-17 devnull }
30 7285a491 2004-06-17 devnull 
31 7285a491 2004-06-17 devnull 
32 7285a491 2004-06-17 devnull int
33 7285a491 2004-06-17 devnull isnumber(char *s)
34 7285a491 2004-06-17 devnull {
35 7285a491 2004-06-17 devnull 	char *q;
36 7285a491 2004-06-17 devnull 
37 7285a491 2004-06-17 devnull 	strtol(s, &q, 10);
38 7285a491 2004-06-17 devnull 	return *q == '\0';
39 7285a491 2004-06-17 devnull }
40 7285a491 2004-06-17 devnull 
41 7285a491 2004-06-17 devnull /* EOF */