/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1992-2010 AT&T Intellectual Property *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.opensource.org/licenses/cpl1.0.txt *
* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Glenn Fowler <gsf@research.att.com> *
* David Korn <dgk@research.att.com> *
* *
***********************************************************************/
#pragma prototyped
/*
* David Korn
* AT&T Research
*
* logname
*/
static const char usage[] =
"[-?\n@(#)$Id: logname (AT&T Research) 1999-04-30 $\n]"
USAGE_LICENSE
"[+NAME?logname - return the user's login name]"
"[+DESCRIPTION?\blogname\b writes the users's login name to standard "
"output. The login name is the string that is returned by the "
"\bgetlogin\b(2) function. If \bgetlogin\b(2) does not return "
"successfully, the corresponding to the real user id of the calling "
"process is used instead.]"
"\n"
"\n\n"
"\n"
"[+EXIT STATUS?]{"
"[+0?Successful Completion.]"
"[+>0?An error occurred.]"
"}"
"[+SEE ALSO?\bgetlogin\b(2)]"
;
#include <cmd.h>
int
b_logname(int argc, char** argv, void* context)
{
register char* logname;
cmdinit(argc, argv, context, ERROR_CATALOG, 0);
for (;;)
{
switch (optget(argv, usage))
{
case ':':
error(2, "%s", opt_info.arg);
continue;
case '?':
error(ERROR_usage(2), "%s", opt_info.arg);
continue;
}
break;
}
if (error_info.errors)
error(ERROR_usage(2), "%s", optusage(NiL));
if (!(logname = getlogin()))
logname = fmtuid(getuid());
sfputr(sfstdout, logname, '\n');
return 0;
}