/* vi: set sw=4 ts=4: */
/*
 * password utility routines.
 *
 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
 * Copyright (C) 2008 by Tito Ragusa <farmatito@tiscali.it>
 *
 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
 */

#include "libbb.h"

/* TODO: maybe change API to return malloced data?
 * This will allow to stop using libc functions returning
 * pointers to static data (getpwuid)
 */

/* TODO: add xgetpwnam, this construct is used a lot */

struct passwd* FAST_FUNC xgetpwuid(uid_t uid)
{
	struct passwd *pw = getpwuid(uid);
	if (!pw)
		bb_error_msg_and_die("unknown uid %u", (unsigned)uid);
	return pw;
}

struct group* FAST_FUNC xgetgrgid(gid_t gid)
{
	struct group *gr = getgrgid(gid);
	if (!gr)
		bb_error_msg_and_die("unknown gid %u", (unsigned)gid);
	return gr;
}

char* FAST_FUNC xuid2uname(uid_t uid)
{
	struct passwd *pw = xgetpwuid(uid);
	return pw->pw_name;
}

char* FAST_FUNC xgid2group(gid_t gid)
{
	struct group *gr = xgetgrgid(gid);
	return gr->gr_name;
}

char* FAST_FUNC uid2uname(uid_t uid)
{
	struct passwd *pw = getpwuid(uid);
	return (pw) ? pw->pw_name : NULL;
}

char* FAST_FUNC gid2group(gid_t gid)
{
	struct group *gr = getgrgid(gid);
	return (gr) ? gr->gr_name : NULL;
}

char* FAST_FUNC uid2uname_utoa(long uid)
{
	char *name = uid2uname(uid);
	return (name) ? name : utoa(uid);
}

char* FAST_FUNC gid2group_utoa(long gid)
{
	char *name = gid2group(gid);
	return (name) ? name : utoa(gid);
}

long FAST_FUNC xuname2uid(const char *name)
{
	struct passwd *myuser;

	myuser = getpwnam(name);
	if (myuser == NULL)
		bb_error_msg_and_die("unknown user %s", name);

	return myuser->pw_uid;
}

long FAST_FUNC xgroup2gid(const char *name)
{
	struct group *mygroup;

	mygroup = getgrnam(name);
	if (mygroup == NULL)
		bb_error_msg_and_die("unknown group %s", name);

	return mygroup->gr_gid;
}

unsigned long FAST_FUNC get_ug_id(const char *s,
		long FAST_FUNC (*xname2id)(const char *))
{
	unsigned long r;

	r = bb_strtoul(s, NULL, 10);
	if (errno)
		return xname2id(s);
	return r;
}