Update.
[glibc.git] / misc / ttyslot.c
blob7dc9b27c0c293ba4e8b9ee213d66b16967b275b6
1 /*
2 * Copyright (c) 1988, 1993
3 * The Regents of the University of California. All rights reserved.
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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
34 #if defined(LIBC_SCCS) && !defined(lint)
35 static char sccsid[] = "@(#)ttyslot.c 8.1 (Berkeley) 6/4/93";
36 #endif /* LIBC_SCCS and not lint */
38 #include <ttyent.h>
39 #include <alloca.h>
40 #include <stdio.h>
41 #include <string.h>
42 #include <unistd.h>
44 int
45 ttyslot()
47 register struct ttyent *ttyp;
48 register int slot;
49 register char *p;
50 int cnt;
51 size_t buflen = __sysconf (_SC_TTY_NAME_MAX) + 1;
52 char *name;
54 if (buflen == 0)
55 /* This should be enough if no fixed value is given. */
56 buflen = 32;
58 name = __alloca (buflen);
60 setttyent();
61 for (cnt = 0; cnt < 3; ++cnt)
62 if (__ttyname_r (cnt, name, buflen) == 0) {
63 if ((p = rindex(name, '/')))
64 ++p;
65 else
66 p = name;
67 for (slot = 1; (ttyp = getttyent()); ++slot)
68 if (!strcmp(ttyp->ty_name, p)) {
69 endttyent();
70 return(slot);
72 break;
74 endttyent();
75 return(0);