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

*                                                                      *

*               This software is part of the ast package               *

*          Copyright (c) 1985-2011 AT&T Intellectual Property          *

*                      and is licensed under the                       *

*                 Eclipse Public License, Version 1.0                  *

*                    by AT&T Intellectual Property                     *

*                                                                      *

*                A copy of the License is available at                 *

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

*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *

*                                                                      *

*              Information and Software Systems Research               *

*                            AT&T Research                             *

*                           Florham Park NJ                            *

*                                                                      *

*                 Glenn Fowler <gsf@research.att.com>                  *

*                  David Korn <dgk@research.att.com>                   *

*                   Phong Vo <kpv@research.att.com>                    *

*                                                                      *

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

#pragma prototyped

/*

 * Glenn Fowler

 * AT&T Bell Laboratories

 *

 * uid name -> number

 */

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

__STDPP__directive pragma pp:hide getpwnam getpwuid

#else

#define getpwnam	______getpwnam

#define getpwuid	______getpwuid

#endif

#include <ast.h>

#include <cdt.h>

#include <pwd.h>

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

__STDPP__directive pragma pp:nohide getpwnam getpwuid

#else

#undef	getpwnam

#undef	getpwuid

#endif

extern struct passwd*	getpwnam(const char*);

extern struct passwd*	getpwuid(uid_t);

typedef struct Id_s

{

	Dtlink_t	link;

	int		id;

	char		name[1];

} Id_t;

/*

 * return uid number given uid name

 * -1 on first error for a given name

 * -2 on subsequent errors for a given name

 */

int

struid(const char* name)

{

	register Id_t*		ip;

	register struct passwd*	pw;

	int			id;

	char*			e;

	static Dt_t*		dict;

	static Dtdisc_t		disc;

	if (!dict)

	{

		disc.key = offsetof(Id_t, name);

		dict = dtopen(&disc, Dtset);

	}

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

		return ip->id;

	if (pw = getpwnam(name))

		id = pw->pw_uid;

	else

	{

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

#if _WINIX

		if (!*e)

		{

			if (!getpwuid(id))

				id = -1;

		}

		else if (streq(name, "root") && (pw = getpwnam("Administrator")))

			id = pw->pw_uid;

		else

			id = -1;

#else

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

			id = -1;

#endif

	}

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

	{

		strcpy(ip->name, name);

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

		dtinsert(dict, ip);

	}

	return id;

}