BSD 4_3 release

[unix-history] / usr / src / lib / libc / gen / ttyslot.c

/*
* Copyright (c) 1984 Regents of the University of California.
* All rights reserved.  The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)ttyslot.c   5.2 (Berkeley) 3/9/86";
#endif LIBC_SCCS and not lint

/*
* Return the number of the slot in the utmp file
* corresponding to the current user: try for file 0, 1, 2.
* Definition is the line number in the /etc/ttys file.
*/
#include <ttyent.h>

char    *ttyname();
char    *rindex();

#define NULL    0

ttyslot()
{
       register struct ttyent *ty;
       register char *tp, *p;
       register s;

       if ((tp = ttyname(0)) == NULL &&
           (tp = ttyname(1)) == NULL &&
           (tp = ttyname(2)) == NULL)
               return(0);
       if ((p = rindex(tp, '/')) == NULL)
               p = tp;
       else
               p++;
       setttyent();
       s = 0;
       while ((ty = getttyent()) != NULL) {
               s++;
               if (strcmp(ty->ty_name, p) == 0) {
                       endttyent();
                       return (s);
               }
       }
       endttyent();
       return (0);
}