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diff --git a/usr.bin/gzip/tests/Makefile b/usr.bin/gzip/tests/Makefile
--- a/usr.bin/gzip/tests/Makefile
+++ b/usr.bin/gzip/tests/Makefile
@@ -2,8 +2,13 @@
.include <bsd.own.mk>
+PACKAGE= tests
+
+ATF_TESTS_SH= zdiff_test
NETBSD_ATF_TESTS_SH= gzip_test
+${PACKAGE}FILES+= foo.diff
+
.include <netbsd-tests.test.mk>
.include <bsd.test.mk>
diff --git a/usr.bin/gzip/tests/foo.diff b/usr.bin/gzip/tests/foo.diff
new file mode 100644
--- /dev/null
+++ b/usr.bin/gzip/tests/foo.diff
@@ -0,0 +1,2 @@
+1a2
+> bar
diff --git a/usr.bin/gzip/tests/zdiff_test.sh b/usr.bin/gzip/tests/zdiff_test.sh
new file mode 100644
--- /dev/null
+++ b/usr.bin/gzip/tests/zdiff_test.sh
@@ -0,0 +1,125 @@
+#
+# SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+#
+# Copyright (c) 2022 Kyle Evans <kevans@FreeBSD.org>
+#
+# 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 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 AUTHOR 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.
+#
+
+specials="foo'bar foo\"bar foo\$bar"
+
+prepare_files()
+{
+ compressfunc="$1"
+ compresssuffix="$2"
+
+ echo "foo" > foo
+
+ for f in $specials foo; do
+ [ "$f" == "foo" ] || cp foo "$f"
+ atf_check "$compressfunc" -k "$f"
+ atf_check tar -ckf "$f.tar" "$f"
+ atf_check -o save:"$f.$compresssuffix" \
+ "$compressfunc" -c "$f.tar"
+
+ # Regenerate $f.tar to create a diff from the .$compresssuffix
+ # file, too.
+ echo "bar" >> "$f"
+ atf_check tar -ckf "$f.tar" "$f"
+ done
+}
+
+atf_test_case gzip
+gzip_body()
+{
+ prepare_files gzip tgz
+ cp foo.gz foo.Z
+
+ for f in foo $specials; do
+ atf_check -s exit:1 -o file:"$(atf_get_srcdir)"/foo.diff \
+ zdiff "$f.gz"
+ done
+
+ atf_check -s exit:1 -o file:"$(atf_get_srcdir)"/foo.diff zdiff foo.Z
+
+ for f in foo $specials; do
+ rm "$f"
+ atf_check -s exit:1 -o match:"Binary files" zdiff "$f.tgz"
+ done
+}
+
+atf_test_case bzip
+bzip_body()
+{
+ prepare_files bzip2 tbz2
+ cp foo.bz2 foo.bz
+
+ for f in foo $specials; do
+ atf_check -s exit:1 -o file:"$(atf_get_srcdir)"/foo.diff \
+ zdiff "$f.bz2"
+ done
+
+ atf_check -s exit:1 -o file:"$(atf_get_srcdir)"/foo.diff zdiff foo.bz
+
+ for f in foo $specials; do
+ rm "$f"
+ atf_check -s exit:1 -o match:"Binary files" zdiff "$f.tbz2"
+ done
+}
+
+atf_test_case xzip
+xzip_body()
+{
+ prepare_files xz txz
+ cp foo.xz foo.lzma
+
+ for f in foo $specials; do
+ atf_check -s exit:1 -o file:"$(atf_get_srcdir)"/foo.diff \
+ zdiff "$f.xz"
+ done
+
+ atf_check -s exit:1 -o file:"$(atf_get_srcdir)"/foo.diff zdiff foo.lzma
+
+ for f in foo $specials; do
+ rm "$f"
+ atf_check -s exit:1 -o match:"Binary files" zdiff "$f.txz"
+ done
+}
+
+atf_test_case unknown
+unknown_body()
+{
+ prepare_files xz fxz
+
+ for f in foo $specials; do
+ atf_check -s exit:1 -e match:"unknown suffix$" zdiff "$f.fxz"
+ done
+}
+
+atf_init_test_cases()
+{
+
+ atf_add_test_case gzip
+ atf_add_test_case bzip
+ atf_add_test_case xzip
+ atf_add_test_case unknown
+}
diff --git a/usr.bin/gzip/zdiff b/usr.bin/gzip/zdiff
--- a/usr.bin/gzip/zdiff
+++ b/usr.bin/gzip/zdiff
@@ -38,48 +38,48 @@
check_suffix() {
case "$1" in
*[._-][Zz])
- setvar $2 "${1%??}"
- setvar $3 "gzip -cdqf"
+ eval "$2=\${1%??}"
+ eval "$3=\"gzip -cdqf\""
;;
*[._-]bz)
- setvar $2 "${1%???}"
- setvar $3 "bzip2 -cdqf"
+ eval "$2=\${1%???}"
+ eval "$3=\"bzip2 -cdqf\""
;;
*[._-]gz)
- setvar $2 "${1%???}"
- setvar $3 "gzip -cdqf"
+ eval "$2=\${1%???}"
+ eval "$3=\"gzip -cdqf\""
;;
*[._-]xz)
- setvar $2 "${1%???}"
- setvar $3 "xz -cdqf"
+ eval "$2=\${1%???}"
+ eval "$3=\"xz -cdqf\""
;;
*[._-]bz2)
- setvar $2 "${1%????}"
- setvar $3 "bzip2 -cdqf"
+ eval "$2=\${1%????}"
+ eval "$3=\"bzip2 -cdqf\""
;;
*[._-]lzma)
- setvar $2 "${1%?????}"
- setvar $3 "xz -cdqf"
+ eval "$2=\${1%?????}"
+ eval "$3=\"xz -cdqf\""
;;
*.t[ag]z)
- setvar $2 "${1%??}"ar
- setvar $3 "gzip -cdqf"
+ eval "$2=\${1%??}ar"
+ eval "$3=\"gzip -cdqf\""
;;
*.tbz)
- setvar $2 "${1%??}"ar
- setvar $3 "bzip2 -cdqf"
+ eval "$2=\${1%??}ar"
+ eval "$3=\"bzip2 -cdqf\""
;;
*.tbz2)
- setvar $2 "${1%???}"ar
- setvar $3 "bzip2 -cdqf"
+ eval "$2=\${1%???}ar"
+ eval "$3=\"bzip2 -cdqf\""
;;
*.t[lx]z)
- setvar $2 "${1%??}"ar
- setvar $3 "xz -cdqf"
+ eval "$2=\${1%??}ar"
+ eval "$3=\"xz -cdqf\""
;;
*)
- setvar $2 "$1"
- setvar $3 ""
+ eval "$2=\$1"
+ eval "$3=\"\""
;;
esac
}

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