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rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable).  these days, people use source.  these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

/*	$OpenBSD: id.c,v 1.19 2009/10/27 23:59:39 deraadt Exp $	*/

/*-
 * Copyright (c) 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/param.h>

#include <errno.h>
#include <grp.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <err.h>

void	current(void);
void	pretty(struct passwd *);
void	group(struct passwd *, int);
void	usage(void);
void	user(struct passwd *);
struct passwd *
	who(char *);

int
main(int argc, char *argv[])
{
	struct group *gr;
	struct passwd *pw;
	int Gflag, ch, gflag, nflag, pflag, rflag, uflag;
	uid_t uid;
	gid_t gid;

	Gflag = gflag = nflag = pflag = rflag = uflag = 0;
	while ((ch = getopt(argc, argv, "Ggnpru")) != -1)
		switch(ch) {
		case 'G':
			Gflag = 1;
			break;
		case 'g':
			gflag = 1;
			break;
		case 'n':
			nflag = 1;
			break;
		case 'p':
			pflag = 1;
			break;
		case 'r':
			rflag = 1;
			break;
		case 'u':
			uflag = 1;
			break;
		case '?':
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

	switch(Gflag + gflag + pflag + uflag) {
	case 1:
		break;
	case 0:
		if (!nflag && !rflag)
			break;
		/* FALLTHROUGH */
	default:
		usage();
	}

	pw = *argv ? who(*argv) : NULL;

	if (gflag) {
		gid = pw ? pw->pw_gid : rflag ? getgid() : getegid();
		if (nflag && (gr = getgrgid(gid)))
			(void)printf("%s\n", gr->gr_name);
		else
			(void)printf("%u\n", gid);
		exit(0);
	}

	if (uflag) {
		uid = pw ? pw->pw_uid : rflag ? getuid() : geteuid();
		if (nflag && (pw = getpwuid(uid)))
			(void)printf("%s\n", pw->pw_name);
		else
			(void)printf("%u\n", uid);
		exit(0);
	}

	if (Gflag) {
		group(pw, nflag);
		exit(0);
	}

	if (pflag) {
		pretty(pw);
		exit(0);
	}

	if (pw)
		user(pw);
	else
		current();
	exit(0);
}

void
pretty(struct passwd *pw)
{
	struct group *gr;
	uid_t eid, rid;
	char *login;

	if (pw) {
		(void)printf("uid\t%s\n", pw->pw_name);
		(void)printf("groups\t");
		group(pw, 1);
	} else {
		if ((login = getlogin()) == NULL)
			err(1, "getlogin");

		pw = getpwuid(rid = getuid());
		if (pw == NULL || strcmp(login, pw->pw_name))
			(void)printf("login\t%s\n", login);
		if (pw)
			(void)printf("uid\t%s\n", pw->pw_name);
		else
			(void)printf("uid\t%u\n", rid);
		
		if ((eid = geteuid()) != rid) {
			if ((pw = getpwuid(eid)))
				(void)printf("euid\t%s\n", pw->pw_name);
			else
				(void)printf("euid\t%u\n", eid);
		}
		if ((rid = getgid()) != (eid = getegid())) {
			if ((gr = getgrgid(rid)))
				(void)printf("rgid\t%s\n", gr->gr_name);
			else
				(void)printf("rgid\t%u\n", rid);
		}
		(void)printf("groups\t");
		group(NULL, 1);
	}
}

void
current(void)
{
	struct group *gr;
	struct passwd *pw;
	int cnt, ngroups;
	uid_t uid, euid;
	gid_t groups[NGROUPS], gid, egid, lastgid;
	char *fmt;

	uid = getuid();
	(void)printf("uid=%u", uid);
	if ((pw = getpwuid(uid)))
		(void)printf("(%s)", pw->pw_name);
	if ((euid = geteuid()) != uid) {
		(void)printf(" euid=%u", euid);
		if ((pw = getpwuid(euid)))
			(void)printf("(%s)", pw->pw_name);
	}
	gid = getgid();
	(void)printf(" gid=%u", gid);
	if ((gr = getgrgid(gid)))
		(void)printf("(%s)", gr->gr_name);
	if ((egid = getegid()) != gid) {
		(void)printf(" egid=%u", egid);
		if ((gr = getgrgid(egid)))
			(void)printf("(%s)", gr->gr_name);
	}
	if ((ngroups = getgroups(NGROUPS, groups))) {
		for (fmt = " groups=%u", lastgid = (gid_t)-1, cnt = 0;
		    cnt < ngroups; fmt = ", %u", lastgid = gid) {
			gid = groups[cnt++];
			if (lastgid == gid)
				continue;
			(void)printf(fmt, gid);
			if ((gr = getgrgid(gid)))
				(void)printf("(%s)", gr->gr_name);
		}
	}
	(void)printf("\n");
}

void
user(struct passwd *pw)
{
	gid_t gid, groups[NGROUPS + 1];
	int cnt, ngroups;
	uid_t uid;
	struct group *gr;
	char *fmt;

	uid = pw->pw_uid;
	(void)printf("uid=%u(%s)", uid, pw->pw_name);
	(void)printf(" gid=%u", pw->pw_gid);
	if ((gr = getgrgid(pw->pw_gid)))
		(void)printf("(%s)", gr->gr_name);
	ngroups = NGROUPS + 1;
	(void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
	fmt = " groups=%u";
	for (cnt = 0; cnt < ngroups;) {
		gid = groups[cnt];
		(void)printf(fmt, gid);
		fmt = ", %u";
		if ((gr = getgrgid(gid)))
			(void)printf("(%s)", gr->gr_name);
		/* Skip same gid entries. */
		while (++cnt < ngroups && gid == groups[cnt]);
	}
	(void)printf("\n");
}

void
group(struct passwd *pw, int nflag)
{
	int cnt, ngroups;
	gid_t gid, groups[NGROUPS + 1];
	struct group *gr;
	char *fmt;

	if (pw) {
		ngroups = NGROUPS + 1;
		(void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
	} else {
		groups[0] = getgid();
		ngroups = getgroups(NGROUPS, groups + 1) + 1;
	}
	fmt = nflag ? "%s" : "%u";
	for (cnt = 0; cnt < ngroups;) {
		gid = groups[cnt];
		if (nflag) {
			if ((gr = getgrgid(gid)))
				(void)printf(fmt, gr->gr_name);
			else
				(void)printf(*fmt == ' ' ? " %u" : "%u",
				    gid);
			fmt = " %s";
		} else {
			(void)printf(fmt, gid);
			fmt = " %u";
		}
		/* Skip same gid entries. */
		while (++cnt < ngroups && gid == groups[cnt]);
	}
	(void)printf("\n");
}

struct passwd *
who(char *u)
{
	struct passwd *pw;
	uid_t uid;
	const char *errstr;

	/*
	 * Translate user argument into a pw pointer.  First, try to
	 * get it as specified.  If that fails, try it as a number.
	 */
	if ((pw = getpwnam(u)))
		return(pw);
	uid = strtonum(u, 0, UID_MAX, &errstr);
	if (!errstr && (pw = getpwuid(uid)))
		return(pw);
	errx(1, "%s: No such user", u);
	/* NOTREACHED */
}

void
usage(void)
{
	(void)fprintf(stderr, "usage: id [user]\n"
			      "       id -G [-n] [user]\n"
			      "       id -g [-nr] [user]\n"
			      "       id -p [user]\n"
			      "       id -u [-nr] [user]\n");
	exit(1);
}