1/*
2 * Copyright (c) 1988, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#if defined(LIBC_SCCS) && !defined(lint)
31static char sccsid[] = "@(#)ttyslot.c 8.1 (Berkeley) 6/4/93";
32#endif /* LIBC_SCCS and not lint */
33
34#include <ttyent.h>
35#include <alloca.h>
36#include <stdio.h>
37#include <string.h>
38#include <unistd.h>
39
40int
41ttyslot (void)
42{
43 struct ttyent *ttyp;
44 int slot;
45 char *p;
46 int cnt;
47 size_t buflen = __sysconf (_SC_TTY_NAME_MAX) + 1;
48 char *name;
49
50 if (buflen == 0)
51 /* This should be enough if no fixed value is given. */
52 buflen = 32;
53
54 name = __alloca (buflen);
55
56 __setttyent();
57 for (cnt = 0; cnt < 3; ++cnt)
58 if (__ttyname_r (cnt, name, buflen) == 0) {
59 if ((p = strrchr (name, '/')))
60 ++p;
61 else
62 p = name;
63 for (slot = 1; (ttyp = __getttyent()); ++slot)
64 if (!strcmp(ttyp->ty_name, p)) {
65 __endttyent();
66 return(slot);
67 }
68 break;
69 }
70 __endttyent();
71 return(0);
72}
73