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) |
31 | static 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 | |
40 | int |
41 | ttyslot (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 = rindex(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 | |