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att
GitHub Repository: att/ast
 Path: blob/master/src/lib/libcmd/logname.c
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/***********************************************************************

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*                                                                      *

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*               This software is part of the ast package               *

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*          Copyright (c) 1992-2012 AT&T Intellectual Property          *

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*                      and is licensed under the                       *

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*                 Eclipse Public License, Version 1.0                  *

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*                    by AT&T Intellectual Property                     *

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*                                                                      *

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*                A copy of the License is available at                 *

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*          http://www.eclipse.org/org/documents/epl-v10.html           *

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*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *

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*                                                                      *

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*              Information and Software Systems Research               *

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*                            AT&T Research                             *

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*                           Florham Park NJ                            *

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*                                                                      *

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*                 Glenn Fowler <[email protected]>                  *

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*                  David Korn <[email protected]>                   *

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*                                                                      *

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***********************************************************************/

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#pragma prototyped

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/*

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 * David Korn

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 * AT&T Research

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 *

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 * logname

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 */

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static const char usage[] =

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"[-?\n@(#)$Id: logname (AT&T Research) 1999-04-30 $\n]"

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USAGE_LICENSE

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"[+NAME?logname - return the user's login name]"

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"[+DESCRIPTION?\blogname\b writes the users's login name to standard "

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	"output.  The login name is the string that is returned by the "

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	"\bgetlogin\b(2) function.  If \bgetlogin\b(2) does not return "

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	"successfully, the corresponding to the real user id of the calling "

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	"process is used instead.]"

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"\n"

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"\n\n"

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"\n"

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"[+EXIT STATUS?]{"

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        "[+0?Successful Completion.]"

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        "[+>0?An error occurred.]"

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"}"

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"[+SEE ALSO?\bgetlogin\b(2)]"

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;

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#include <cmd.h>

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int

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b_logname(int argc, char** argv, Shbltin_t* context)

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{

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	register char*	logname;

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	cmdinit(argc, argv, context, ERROR_CATALOG, 0);

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	for (;;)

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	{

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		switch (optget(argv, usage))

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		{

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		case ':':

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			error(2, "%s", opt_info.arg);

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			continue;

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		case '?':

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			error(ERROR_usage(2), "%s", opt_info.arg);

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			continue;

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		}

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		break;

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	}

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	if (error_info.errors)

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		error(ERROR_usage(2), "%s", optusage(NiL));

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	if (!(logname = getlogin()))

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		logname = fmtuid(getuid());

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	sfputr(sfstdout, logname, '\n');

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	return 0;

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}

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