projects / apple / libc.git / blame
| Commit | Line | Data |
|---|---|---|
| e9ce8d39 A |
1 | /* |
| 2 | * Copyright (c) 1999 Apple Computer, Inc. All rights reserved. | |
| 3 | * | |
| 4 | * @APPLE_LICENSE_HEADER_START@ | |
| 5 | * | |
| 6 | * The contents of this file constitute Original Code as defined in and | |
| 7 | * are subject to the Apple Public Source License Version 1.1 (the | |
| 8 | * "License"). You may not use this file except in compliance with the | |
| 9 | * License. Please obtain a copy of the License at | |
| 10 | * http://www.apple.com/publicsource and read it before using this file. | |
| 11 | * | |
| 12 | * This Original Code and all software distributed under the License are | |
| 13 | * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 14 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, | |
| 15 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 16 | * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the | |
| 17 | * License for the specific language governing rights and limitations | |
| 18 | * under the License. | |
| 19 | * | |
| 20 | * @APPLE_LICENSE_HEADER_END@ | |
| 21 | */ | |
| 22 | /* | |
| 23 | * Copyright (c) 1988, 1993 | |
| 24 | * The Regents of the University of California. All rights reserved. | |
| 25 | * | |
| 26 | * Redistribution and use in source and binary forms, with or without | |
| 27 | * modification, are permitted provided that the following conditions | |
| 28 | * are met: | |
| 29 | * 1. Redistributions of source code must retain the above copyright | |
| 30 | * notice, this list of conditions and the following disclaimer. | |
| 31 | * 2. Redistributions in binary form must reproduce the above copyright | |
| 32 | * notice, this list of conditions and the following disclaimer in the | |
| 33 | * documentation and/or other materials provided with the distribution. | |
| 34 | * 3. All advertising materials mentioning features or use of this software | |
| 35 | * must display the following acknowledgement: | |
| 36 | * This product includes software developed by the University of | |
| 37 | * California, Berkeley and its contributors. | |
| 38 | * 4. Neither the name of the University nor the names of its contributors | |
| 39 | * may be used to endorse or promote products derived from this software | |
| 40 | * without specific prior written permission. | |
| 41 | * | |
| 42 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
| 43 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 44 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 45 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
| 46 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 47 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 48 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 49 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 50 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 51 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 52 | * SUCH DAMAGE. | |
| 53 | */ | |
| 54 | ||
| 55 | ||
| 56 | #include <sys/param.h> | |
| 57 | #include <pwd.h> | |
| 58 | #include <utmp.h> | |
| 59 | #include <stdio.h> | |
| 60 | #include <string.h> | |
| 61 | #include <unistd.h> | |
| 62 | ||
| 63 | int _logname_valid = 0; /* known to setlogin() */ | |
| 64 | ||
| 65 | char * | |
| 66 | getlogin() | |
| 67 | { | |
| 68 | static char logname[MAXLOGNAME + 1]; | |
| 69 | ||
| 70 | if (_logname_valid == 0) { | |
| 71 | if (_getlogin(logname, sizeof(logname) - 1) < 0) | |
| 72 | return ((char *)NULL); | |
| 73 | _logname_valid = 1; | |
| 74 | } | |
| 75 | return (*logname ? logname : (char *)NULL); | |
| 76 | } |