1 /***********************************************************************
2 * *
3 * This software is part of the ast package *
4 * Copyright (c) 1992-2012 AT&T Intellectual Property *
5 * and is licensed under the *
6 * Eclipse Public License, Version 1.0 *
7 * by AT&T Intellectual Property *
8 * *
9 * A copy of the License is available at *
10 * http://www.eclipse.org/org/documents/epl-v10.html *
11 * (with md5 checksum b35adb5213ca9657e911e9befb180842) *
12 * *
13 * Information and Software Systems Research *
14 * AT&T Research *
15 * Florham Park NJ *
16 * *
17 * Glenn Fowler <gsf@research.att.com> *
18 * David Korn <dgk@research.att.com> *
19 * *
20 ***********************************************************************/
21 #pragma prototyped
22 /*
23 * David Korn
24 * AT&T Research
25 *
26 * logname
27 */
28
29 static const char usage[] =
30 "[-?\n@(#)$Id: logname (AT&T Research) 1999-04-30 $\n]"
31 USAGE_LICENSE
32 "[+NAME?logname - return the user's login name]"
33 "[+DESCRIPTION?\blogname\b writes the users's login name to standard "
34 "output. The login name is the string that is returned by the "
35 "\bgetlogin\b(2) function. If \bgetlogin\b(2) does not return "
36 "successfully, the corresponding to the real user id of the calling "
37 "process is used instead.]"
38
39 "\n"
40 "\n\n"
41 "\n"
42 "[+EXIT STATUS?]{"
43 "[+0?Successful Completion.]"
44 "[+>0?An error occurred.]"
45 "}"
46 "[+SEE ALSO?\bgetlogin\b(2)]"
47 ;
48
49
50 #include <cmd.h>
51
52 int
b_logname(int argc,char ** argv,Shbltin_t * context)53 b_logname(int argc, char** argv, Shbltin_t* context)
54 {
55 register char* logname;
56
57 cmdinit(argc, argv, context, ERROR_CATALOG, 0);
58 for (;;)
59 {
60 switch (optget(argv, usage))
61 {
62 case ':':
63 error(2, "%s", opt_info.arg);
64 continue;
65 case '?':
66 error(ERROR_usage(2), "%s", opt_info.arg);
67 continue;
68 }
69 break;
70 }
71 if (error_info.errors)
72 error(ERROR_usage(2), "%s", optusage(NiL));
73 if (!(logname = getlogin()))
74 logname = fmtuid(getuid());
75 sfputr(sfstdout, logname, '\n');
76 return 0;
77 }
78
79