1 /*-
2 * Copyright (c) 1992, 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 * 3. 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 #include <sys/cdefs.h>
31 #if defined(LIBC_SCCS) && !defined(lint)
32 #if 0
33 static char sccsid[] = "@(#)cuserid.c 8.1 (Berkeley) 6/4/93";
34 #else
35 __RCSID("$NetBSD: cuserid.c,v 1.8 2005/04/19 03:38:08 lukem Exp $");
36 #endif
37 #endif /* LIBC_SCCS and not lint */
38
39 #include <pwd.h>
40 #include <stdio.h>
41 #include <string.h>
42 #include <unistd.h>
43
44 char *
cuserid(char * s)45 cuserid(char *s)
46 {
47 struct passwd *pw, pwres;
48 static char buf[L_cuserid];
49 char pwbuf[1024];
50
51 /* s may be NULL */
52
53 if (getpwuid_r(geteuid(), &pwres, pwbuf, sizeof(pwbuf), &pw) != 0
54 || pw == NULL) {
55 if (s != NULL)
56 *s = '\0';
57 return s;
58 }
59 if (s == NULL)
60 s = buf;
61 (void)strncpy(s, pw->pw_name, L_cuserid);
62 return s;
63 }
64