various: general adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

No functional change intended.

19 files changed, 489 insertions, 0 deletions

diff --git a/adduser/adduser.sh b/adduser/adduser.sh
index 4b0a6f6..5f80d77 100644
--- a/adduser/adduser.sh
+++ b/adduser/adduser.sh
@@ -1,5 +1,7 @@
 #!/bin/sh
 #
+# SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+#
 # Copyright (c) 2002-2004 Michael Telahun Makonnen. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
diff --git a/adduser/rmuser.sh b/adduser/rmuser.sh
new file mode 100644
index 0000000..abaf004
--- /dev/null
+++ b/adduser/rmuser.sh
@@ -0,0 +1,363 @@
+#!/bin/sh
+#
+# SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+#
+# Copyright (c) 2002, 2003 Michael Telahun Makonnen. 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.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+#
+#	Email: Mike Makonnen <mtm@FreeBSD.Org>
+#
+# $FreeBSD$
+#
+
+ATJOBDIR="/var/at/jobs"
+CRONJOBDIR="/var/cron/tabs"
+MAILSPOOL="/var/mail"
+SIGKILL="-KILL"
+TEMPDIRS="/tmp /var/tmp"
+THISCMD=`/usr/bin/basename $0`
+PWCMD="${PWCMD:-/usr/sbin/pw}"
+
+# err msg
+#	Display $msg on stderr.
+#
+err() {
+	echo 1>&2 ${THISCMD}: $*
+}
+
+# verbose
+#	Returns 0 if verbose mode is set, 1 if it is not.
+#
+verbose() {
+	[ -n "$vflag" ] && return 0 || return 1
+}
+
+# rm_files login
+#	Removes files or empty directories belonging to $login from various
+#	temporary directories.
+#
+rm_files() {
+	# The argument is required
+	[ -n $1 ] && login=$1 || return
+
+	totalcount=0
+	for _dir in ${TEMPDIRS} ; do
+		filecount=0
+		if [ ! -d $_dir ]; then
+			err "$_dir is not a valid directory."
+			continue
+		fi
+		verbose && echo -n "Removing files owned by ($login) in $_dir:"
+		filecount=`find 2>/dev/null "$_dir" -user "$login" -delete -print |
+		    wc -l | sed 's/ *//'`
+		verbose && echo " $filecount removed."
+		totalcount=$(($totalcount + $filecount))
+	done
+	! verbose && [ $totalcount -ne 0 ] && echo -n " files($totalcount)"
+}
+
+# rm_mail login
+#	Removes unix mail and pop daemon files belonging to the user
+#	specified in the $login argument.
+#
+rm_mail() {
+	# The argument is required
+	[ -n $1 ] && login=$1 || return
+
+	verbose && echo -n "Removing mail spool(s) for ($login):"
+	if [ -f ${MAILSPOOL}/$login ]; then
+		verbose && echo -n " ${MAILSPOOL}/$login" ||
+		    echo -n " mailspool"
+		rm ${MAILSPOOL}/$login
+	fi
+	if [ -f ${MAILSPOOL}/.${login}.pop ]; then
+		verbose && echo -n " ${MAILSPOOL}/.${login}.pop" ||
+		    echo -n " pop3"
+		rm ${MAILSPOOL}/.${login}.pop
+	fi
+	verbose && echo '.'
+}
+
+# kill_procs login
+#	Send a SIGKILL to all processes owned by $login.
+#
+kill_procs() {
+	# The argument is required
+	[ -n $1 ] && login=$1 || return
+
+	verbose && echo -n "Terminating all processes owned by ($login):"
+	killcount=0
+	proclist=`ps 2>/dev/null -U $login | grep -v '^\ *PID' | awk '{print $1}'`
+	for _pid in $proclist ; do
+		kill 2>/dev/null ${SIGKILL} $_pid
+		killcount=$(($killcount + 1))
+	done
+	verbose && echo " ${SIGKILL} signal sent to $killcount processes."
+	! verbose && [ $killcount -ne 0 ] && echo -n " processes(${killcount})"
+}
+
+# rm_at_jobs login
+#	Remove at (1) jobs belonging to $login.
+#
+rm_at_jobs() {
+	# The argument is required
+	[ -n $1 ] && login=$1 || return
+
+	atjoblist=`find 2>/dev/null ${ATJOBDIR} -maxdepth 1 -user $login -print`
+	jobcount=0
+	verbose && echo -n "Removing at(1) jobs owned by ($login):"
+	for _atjob in $atjoblist ; do
+		rm -f $_atjob
+		jobcount=$(($jobcount + 1))
+	done
+	verbose && echo " $jobcount removed."
+	! verbose && [ $jobcount -ne 0 ] && echo -n " at($jobcount)"
+}
+
+# rm_crontab login
+#	Removes crontab file belonging to user $login.
+#
+rm_crontab() {
+	# The argument is required
+	[ -n $1 ] && login=$1 || return
+
+	verbose && echo -n "Removing crontab for ($login):"
+	if [ -f ${CRONJOBDIR}/$login ]; then
+		verbose && echo -n " ${CRONJOBDIR}/$login" || echo -n " crontab"
+		rm -f ${CRONJOBDIR}/$login
+	fi
+	verbose && echo '.'
+}
+
+# rm_ipc login
+#	Remove all IPC mechanisms which are owned by $login.
+#
+rm_ipc() {
+	verbose && echo -n "Removing IPC mechanisms"
+	for i in s m q; do
+		ipcs -$i |
+		awk -v i=$i -v login=$1 '$1 == i && $5 == login { print $2 }' |
+		xargs -n 1 ipcrm -$i
+	done
+	verbose && echo '.'
+}
+
+# rm_user login
+#	Remove user $login from the system. This subroutine makes use
+#	of the pw(8) command to remove a user from the system. The pw(8)
+#	command will remove the specified user from the user database
+#	and group file and remove any crontabs. His home
+#	directory will be removed if it is owned by him and contains no 
+#	files or subdirectories owned by other users. Mail spool files will
+#	also be removed.
+#
+rm_user() {
+	# The argument is required
+	[ -n $1 ] && login=$1 || return
+
+	verbose && echo -n "Removing user ($login)"
+	[ -n "$pw_rswitch" ] && {
+		verbose && echo -n " (including home directory)"
+		! verbose && echo -n " home"
+	}
+	! verbose && echo -n " passwd"
+	verbose && echo -n " from the system:"
+	${PWCMD} userdel -n $login $pw_rswitch
+	verbose && echo ' Done.'
+}
+
+# prompt_yesno msg
+#	Prompts the user with a $msg. The answer is expected to be
+#	yes, no, or some variation thereof. This subroutine returns 0
+#	if the answer was yes, 1 if it was not.
+#
+prompt_yesno() {
+	# The argument is required
+	[ -n "$1" ] && msg="$1" || return
+
+        while : ; do
+                echo -n "$msg"
+                read _ans
+                case $_ans in
+                [Nn][Oo]|[Nn])
+			return 1
+                        ;;
+                [Yy][Ee][Ss]|[Yy][Ee]|[Yy])
+                        return 0
+                        ;;
+                *)
+                        ;;
+                esac
+	done
+}
+
+# show_usage
+#	(no arguments)
+#	Display usage message.
+#
+show_usage() {
+	echo "usage: ${THISCMD} [-yv] [-f file] [user ...]"
+	echo "       if the -y switch is used, either the -f switch or"
+	echo "       one or more user names must be given"
+}
+
+#### END SUBROUTINE DEFENITION ####
+
+ffile=
+fflag=
+procowner=
+pw_rswitch=
+userlist=
+yflag=
+vflag=
+
+procowner=`/usr/bin/id -u`
+if [ "$procowner" != "0" ]; then
+	err 'you must be root (0) to use this utility.'
+	exit 1
+fi
+
+args=`getopt 2>/dev/null yvf: $*`
+if [ "$?" != "0" ]; then
+	show_usage
+	exit 1
+fi
+set -- $args
+for _switch ; do
+	case $_switch in
+	-y)
+		yflag=1
+		shift
+		;;
+	-v)
+		vflag=1
+		shift
+		;;
+	-f)
+		fflag=1
+		ffile="$2"
+		shift; shift
+		;;
+	--)
+		shift
+		break
+		;;
+	esac
+done
+
+# Get user names from a file if the -f switch was used. Otherwise,
+# get them from the commandline arguments. If we're getting it
+# from a file, the file must be owned by and writable only by root.
+#
+if [ $fflag ]; then
+	_insecure=`find $ffile ! -user 0 -or -perm +0022`
+	if [ -n "$_insecure" ]; then
+		err "file ($ffile) must be owned by and writeable only by root."
+		exit 1
+	fi
+	if [ -r "$ffile" ]; then
+		userlist=`cat $ffile | while read _user _junk ; do
+			case $_user in
+			\#*|'')
+				;;
+			*)
+				echo -n "$userlist $_user"
+				;;
+			esac
+		done`
+	fi
+else
+	while [ $1 ] ; do
+		userlist="$userlist $1"
+		shift
+	done
+fi
+
+# If the -y or -f switch has been used and the list of users to remove
+# is empty it is a fatal error. Otherwise, prompt the user for a list
+# of one or more user names.
+#
+if [ ! "$userlist" ]; then
+	if [ $fflag ]; then
+		err "($ffile) does not exist or does not contain any user names."
+		exit 1
+	elif [ $yflag ]; then
+		show_usage
+		exit 1
+	else
+		echo -n "Please enter one or more usernames: "
+		read userlist
+	fi
+fi
+
+_user=
+_uid=
+for _user in $userlist ; do
+	# Make sure the name exists in the passwd database and that it
+	# does not have a uid of 0
+	#
+	userrec=`pw 2>/dev/null usershow -n $_user`
+	if [ "$?" != "0" ]; then
+		err "user ($_user) does not exist in the password database."
+		continue
+	fi
+	_uid=`echo $userrec | awk -F: '{print $3}'`
+	if [ "$_uid" = "0" ]; then
+		err "user ($_user) has uid 0. You may not remove this user."
+		continue
+	fi
+
+	# If the -y switch was not used ask for confirmation to remove the
+	# user and home directory.
+	#
+	if [ -z "$yflag" ]; then
+		echo "Matching password entry:"
+		echo
+		echo $userrec
+		echo
+		if ! prompt_yesno "Is this the entry you wish to remove? " ; then
+			continue
+		fi
+		_homedir=`echo $userrec | awk -F: '{print $9}'`
+		if prompt_yesno "Remove user's home directory ($_homedir)? "; then
+			pw_rswitch="-r"
+		fi
+	else
+		pw_rswitch="-r"
+	fi
+
+	# Disable any further attempts to log into this account
+	${PWCMD} 2>/dev/null lock $_user
+
+	# Remove crontab, mail spool, etc. Then obliterate the user from
+	# the passwd and group database.
+	#
+	! verbose && echo -n "Removing user ($_user):"
+	rm_crontab $_user
+	rm_at_jobs $_user
+	rm_ipc $_user
+	kill_procs $_user
+	rm_files $_user
+	rm_mail $_user
+	rm_user $_user
+	! verbose && echo "."
+done
diff --git a/pw/bitmap.c b/pw/bitmap.c
index 8e96bff..be82b2c 100644
--- a/pw/bitmap.c
+++ b/pw/bitmap.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (C) 1996
  *	David L. Nugent.  All rights reserved.
  *
diff --git a/pw/bitmap.h b/pw/bitmap.h
new file mode 100644
index 0000000..570c678
--- /dev/null
+++ b/pw/bitmap.h
@@ -0,0 +1,52 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (C) 1996
+ *	David L. Nugent.  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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT 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 DAVID L. NUGENT 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _BITMAP_H_
+#define _BITMAP_H_
+
+#include <sys/cdefs.h>
+
+struct bitmap
+{
+	int	      size;
+	unsigned char *map;
+};
+
+__BEGIN_DECLS
+struct bitmap bm_alloc(int size);
+void bm_dealloc(struct bitmap * bm);
+void bm_setbit(struct bitmap * bm, int pos);
+void bm_clrbit(struct bitmap * bm, int pos);
+int bm_isset(struct bitmap * bm, int pos);
+int bm_firstunset(struct bitmap * bm);
+int bm_lastset(struct bitmap * bm);
+__END_DECLS
+
+#endif				/* !_BITMAP_H */
diff --git a/pw/cpdir.c b/pw/cpdir.c
index 679758b..4e6ca88 100644
--- a/pw/cpdir.c
+++ b/pw/cpdir.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (C) 1996
  *	David L. Nugent.  All rights reserved.
  *
diff --git a/pw/grupd.c b/pw/grupd.c
index 5d0df02..e98dd29 100644
--- a/pw/grupd.c
+++ b/pw/grupd.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (C) 1996
  *	David L. Nugent.  All rights reserved.
  *
diff --git a/pw/psdate.c b/pw/psdate.c
index b63d882..94d2a34 100644
--- a/pw/psdate.c
+++ b/pw/psdate.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (C) 1996
  *	David L. Nugent.  All rights reserved.
  *
diff --git a/pw/psdate.h b/pw/psdate.h
new file mode 100644
index 0000000..bb71da3
--- /dev/null
+++ b/pw/psdate.h
@@ -0,0 +1,42 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (C) 1996
+ *	David L. Nugent.  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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT 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 DAVID L. NUGENT 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _PSDATE_H_
+#define _PSDATE_H_
+
+#include <time.h>
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+time_t parse_date(time_t dt, char const * str);
+void print_date(char *buf, time_t t, int dotime);
+__END_DECLS
+
+#endif				/* !_PSDATE_H_ */
diff --git a/pw/pw.c b/pw/pw.c
index 700a7b2..5f02a15 100644
--- a/pw/pw.c
+++ b/pw/pw.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (C) 1996
  *	David L. Nugent.  All rights reserved.
  *
diff --git a/pw/pw.h b/pw/pw.h
index 592d592..816c755 100644
--- a/pw/pw.h
+++ b/pw/pw.h
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (C) 1996
  *	David L. Nugent.  All rights reserved.
  *
diff --git a/pw/pw_conf.c b/pw/pw_conf.c
index a3bd0bd..e1dc682 100644
--- a/pw/pw_conf.c
+++ b/pw/pw_conf.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (C) 1996
  *	David L. Nugent.  All rights reserved.
  *
diff --git a/pw/pw_group.c b/pw/pw_group.c
index 0a2b1eb..dd65062 100644
--- a/pw/pw_group.c
+++ b/pw/pw_group.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (C) 1996
  *	David L. Nugent.  All rights reserved.
  *
diff --git a/pw/pw_log.c b/pw/pw_log.c
index fe8d803..17e14d1 100644
--- a/pw/pw_log.c
+++ b/pw/pw_log.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (C) 1996
  *	David L. Nugent.  All rights reserved.
  *
diff --git a/pw/pw_nis.c b/pw/pw_nis.c
index 087c946..4b70bc1 100644
--- a/pw/pw_nis.c
+++ b/pw/pw_nis.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (C) 1996
  *	David L. Nugent.  All rights reserved.
  *
diff --git a/pw/pw_user.c b/pw/pw_user.c
index 92d5c6c..395564d 100644
--- a/pw/pw_user.c
+++ b/pw/pw_user.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (C) 1996
  *	David L. Nugent.  All rights reserved.
  *
diff --git a/pw/pw_vpw.c b/pw/pw_vpw.c
index 58e5294..ea87f71 100644
--- a/pw/pw_vpw.c
+++ b/pw/pw_vpw.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (C) 1996
  *	David L. Nugent.  All rights reserved.
  *
diff --git a/pw/pwupd.c b/pw/pwupd.c
index 87c3c99..ac91c9e 100644
--- a/pw/pwupd.c
+++ b/pw/pwupd.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (C) 1996
  *	David L. Nugent.  All rights reserved.
  *
diff --git a/pw/pwupd.h b/pw/pwupd.h
index daca487..b6f268b 100644
--- a/pw/pwupd.h
+++ b/pw/pwupd.h
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (C) 1996
  *	David L. Nugent.  All rights reserved.
  *
diff --git a/pw/rm_r.c b/pw/rm_r.c
index 45fc5d1..940266d 100644
--- a/pw/rm_r.c
+++ b/pw/rm_r.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (C) 1996
  *	David L. Nugent.  All rights reserved.
  *