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att
GitHub Repository: att/ast
 Path: blob/master/src/lib/libast/string/fmtgid.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) 1985-2011 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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*                   Phong Vo <[email protected]>                    *

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*                                                                      *

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

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#pragma prototyped

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/*

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 * Glenn Fowler

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 * AT&T Bell Laboratories

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 *

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 * cached gid number -> name

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 */

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#if defined(__STDPP__directive) && defined(__STDPP__hide)

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__STDPP__directive pragma pp:hide getgrgid

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#else

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#define getgrgid	______getgrgid

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#endif

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#include <ast.h>

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#include <cdt.h>

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#include <grp.h>

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#if defined(__STDPP__directive) && defined(__STDPP__hide)

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__STDPP__directive pragma pp:nohide getgrgid

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#else

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#undef	getgrgid

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#endif

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extern struct group*	getgrgid(gid_t);

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typedef struct Id_s

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{

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	Dtlink_t	link;

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	int		id;

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	char		name[1];

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} Id_t;

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/*

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 * return gid name given gid number

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 */

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char*

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fmtgid(int gid)

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{

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	register Id_t*		ip;

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	register char*		name;

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	register struct group*	gr;

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	int			z;

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	static Dt_t*		dict;

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	static Dtdisc_t		disc;

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	if (!dict)

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	{

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		disc.key = offsetof(Id_t, id);

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		disc.size = sizeof(int);

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		dict = dtopen(&disc, Dtset);

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	}

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	else if (ip = (Id_t*)dtmatch(dict, &gid))

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		return ip->name;

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	if (gr = getgrgid(gid))

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	{

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		name = gr->gr_name;

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#if _WINIX

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		if (streq(name, "Administrators"))

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			name = "sys";

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#endif

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	}

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	else if (gid == 0)

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		name = "sys";

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	else

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	{

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		name = fmtbuf(z = sizeof(gid) * 3 + 1);

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		sfsprintf(name, z, "%I*d", sizeof(gid), gid);

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	}

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	if (dict && (ip = newof(0, Id_t, 1, strlen(name))))

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	{

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		ip->id = gid;

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		strcpy(ip->name, name);

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		dtinsert(dict, ip);

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		return ip->name;

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	}

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	return name;

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}

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