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GitHub Repository: att/ast
 Path: blob/master/src/lib/libast/string/strgid.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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 * gid name -> number

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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 getgrnam getpwnam

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#else

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#define getgrgid	______getgrgid

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#define getgrnam	______getgrnam

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#define getpwnam	______getpwnam

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#endif

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#include <ast.h>

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#include <cdt.h>

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#include <pwd.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 getgrnam getpwnam

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#else

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#undef	getgrgid

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#undef	getgrnam

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#undef	getpwnam

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#endif

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extern struct group*	getgrgid(gid_t);

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extern struct group*	getgrnam(const char*);

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extern struct passwd*	getpwnam(const char*);

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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 number given gid/uid name

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 * gid attempted first, then uid->pw_gid

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 * -1 on first error for a given name

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 * -2 on subsequent errors for a given name

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 */

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int

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strgid(const char* name)

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{

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	register Id_t*		ip;

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	register struct group*	gr;

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	register struct passwd*	pw;

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	int			id;

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	char*			e;

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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, name);

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		dict = dtopen(&disc, Dtset);

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	}

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	else if (ip = (Id_t*)dtmatch(dict, name))

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		return ip->id;

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	if (gr = getgrnam(name))

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		id = gr->gr_gid;

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	else if (pw = getpwnam(name))

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		id = pw->pw_gid;

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	else

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	{

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		id = strtol(name, &e, 0);

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#if _WINIX

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		if (!*e)

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		{

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			if (!getgrgid(id))

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				id = -1;

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		}

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		else if (!streq(name, "sys"))

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			id = -1;

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		else if (gr = getgrnam("Administrators"))

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			id = gr->gr_gid;

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		else if (pw = getpwnam("Administrator"))

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			id = pw->pw_gid;

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		else

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			id = -1;

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#else

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		if (*e || !getgrgid(id))

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			id = -1;

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#endif

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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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		strcpy(ip->name, name);

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		ip->id = id >= 0 ? id : -2;

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		dtinsert(dict, ip);

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	}

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	return id;

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}

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