tuid.c - plan9port - [fork] Plan 9 from user space
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       ---
       tuid.c (520B)
       ---
            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 
           14 sniff(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
           33 isnumber(char *s)
           34 {
           35         char *q;
           36 
           37         strtol(s, &q, 10);
           38         return *q == '\0';
           39 }
           40 
           41 /* EOF */