1 #include <u.h> 2 #include <libc.h> 3 4 /* 5 * /adm/users is 6 * id:user/group:head member:other members 7 * 8 * /etc/{passwd,group} 9 * name:x:nn:other stuff 10 */ 11 12 static int isnumber(char *s); 13 sniff(Biobuf * b)14sniff(Biobuf *b) 15 { 16 read first line of file into p; 17 18 nf = getfields(p, f, nelem(f), ":"); 19 if(nf < 4) 20 return nil; 21 22 if(isnumber(f[0]) && !isnumber(f[2])) 23 return _plan9; 24 25 if(!isnumber(f[0]) && isnumber(f[2])) 26 return _unix; 27 28 return nil; 29 } 30 31 32 int isnumber(char * s)33isnumber(char *s) 34 { 35 char *q; 36 37 strtol(s, &q, 10); 38 return *q == '\0'; 39 } 40 41 /* EOF */ 42