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logname.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*                  Copyright (c) 1992-2006 AT&T Corp.                  *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                            by AT&T Corp.                             *
*                                                                      *
*                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 Labs 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 <cmdlib.h>

int
b_logname(int argc, char** argv, void* context)
{
      register char*    logname;

      NoP(argc);
      cmdinit(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;
}


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