1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
23 /* All Rights Reserved */
24
25 /*
26 * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
27 * Use is subject to license terms.
28 */
29
30 /*
31 * getname(name) -- get logname
32 *
33 * getname tries to find the user's logname from:
34 * ${LOGNAME}, if set and if it is telling the truth
35 * /etc/passwd, otherwise
36 *
37 * The logname is returned as the value of the function.
38 *
39 * Getname returns the user's user id converted to ASCII
40 * for unknown lognames.
41 *
42 */
43
44 #include "string.h"
45 #include "pwd.h"
46 #include "errno.h"
47 #include "sys/types.h"
48 #include "stdlib.h"
49 #include "unistd.h"
50
51 #include "lp.h"
52
53 char *
54 #if defined(__STDC__)
getname(void)55 getname (
56 void
57 )
58 #else
59 getname ()
60 #endif
61 {
62 uid_t uid;
63 struct passwd *p;
64 static char *logname = 0;
65 char *l;
66
67 if (logname)
68 return (logname);
69
70 uid = getuid();
71
72 setpwent ();
73 if (
74 !(l = getenv("LOGNAME"))
75 || !(p = getpwnam(l))
76 || p->pw_uid != uid
77 )
78 if ((p = getpwuid(uid)))
79 l = p->pw_name;
80 else
81 l = 0;
82 endpwent ();
83
84 if (l)
85 logname = Strdup(l);
86 else {
87 if (uid > 0) {
88 logname = Malloc(10 + 1);
89 if (logname)
90 sprintf (logname, "%d", uid);
91 }
92 }
93
94 if (!logname)
95 {
96 errno = ENOMEM;
97 }
98 else
99 {
100 errno = 0;
101 }
102
103 return (logname);
104 }
105