#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;
}


int
isnumber(char *s)
{
       char *q;

       strtol(s, &q, 10);
       return *q == '\0';
}

/* EOF */

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