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Annotation of 43BSD/lib/libc/gen/ttyslot.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1984 Regents of the University of California.
                      3:  * All rights reserved.  The Berkeley software License Agreement
                      4:  * specifies the terms and conditions for redistribution.
                      5:  */
                      6: 
                      7: #if defined(LIBC_SCCS) && !defined(lint)
                      8: static char sccsid[] = "@(#)ttyslot.c  5.2 (Berkeley) 3/9/86";
                      9: #endif LIBC_SCCS and not lint
                     10: 
                     11: /*
                     12:  * Return the number of the slot in the utmp file
                     13:  * corresponding to the current user: try for file 0, 1, 2.
                     14:  * Definition is the line number in the /etc/ttys file.
                     15:  */
                     16: #include <ttyent.h>
                     17: 
                     18: char   *ttyname();
                     19: char   *rindex();
                     20: 
                     21: #define        NULL    0
                     22: 
                     23: ttyslot()
                     24: {
                     25:        register struct ttyent *ty;
                     26:        register char *tp, *p;
                     27:        register s;
                     28: 
                     29:        if ((tp = ttyname(0)) == NULL &&
                     30:            (tp = ttyname(1)) == NULL &&
                     31:            (tp = ttyname(2)) == NULL)
                     32:                return(0);
                     33:        if ((p = rindex(tp, '/')) == NULL)
                     34:                p = tp;
                     35:        else
                     36:                p++;
                     37:        setttyent();
                     38:        s = 0;
                     39:        while ((ty = getttyent()) != NULL) {
                     40:                s++;
                     41:                if (strcmp(ty->ty_name, p) == 0) {
                     42:                        endttyent();
                     43:                        return (s);
                     44:                }
                     45:        }
                     46:        endttyent();
                     47:        return (0);
                     48: }

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