| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 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 | } |