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28f540f4 RM |
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. | |
28f540f4 RM |
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> | |
47707456 | 35 | #include <alloca.h> |
28f540f4 RM |
36 | #include <stdio.h> |
37 | #include <string.h> | |
38 | #include <unistd.h> | |
39 | ||
40 | int | |
60d2f8f3 | 41 | ttyslot (void) |
28f540f4 | 42 | { |
2e09a79a JM |
43 | struct ttyent *ttyp; |
44 | int slot; | |
45 | char *p; | |
28f540f4 | 46 | int cnt; |
47707456 | 47 | size_t buflen = __sysconf (_SC_TTY_NAME_MAX) + 1; |
28f540f4 RM |
48 | char *name; |
49 | ||
47707456 UD |
50 | if (buflen == 0) |
51 | /* This should be enough if no fixed value is given. */ | |
52 | buflen = 32; | |
53 | ||
54 | name = __alloca (buflen); | |
55 | ||
abccad04 | 56 | __setttyent(); |
47707456 | 57 | for (cnt = 0; cnt < 3; ++cnt) |
f21acc89 | 58 | if (__ttyname_r (cnt, name, buflen) == 0) { |
c7a37ad3 | 59 | if ((p = strrchr (name, '/'))) |
28f540f4 RM |
60 | ++p; |
61 | else | |
62 | p = name; | |
abccad04 | 63 | for (slot = 1; (ttyp = __getttyent()); ++slot) |
28f540f4 | 64 | if (!strcmp(ttyp->ty_name, p)) { |
abccad04 | 65 | __endttyent(); |
28f540f4 RM |
66 | return(slot); |
67 | } | |
68 | break; | |
69 | } | |
abccad04 | 70 | __endttyent(); |
28f540f4 RM |
71 | return(0); |
72 | } |