* init.cfg (bad_unicode): New function, copied from
tests/fold/fold-characters.sh with the NUL removed.
* tests/fold/fold-characters.sh (bad_unicode): Rename to
bad_unicode_with_nul. Reformat long line.
* tests/mktemp/bad-unicode.sh: New test.
* tests/local.mk (all_tests): Add the new test.
---
init.cfg | 9 +++++++
tests/fold/fold-characters.sh | 7 +++---
tests/local.mk | 1 +
tests/mktemp/bad-unicode.sh | 44 +++++++++++++++++++++++++++++++++++
4 files changed, 58 insertions(+), 3 deletions(-)
create mode 100755 tests/mktemp/bad-unicode.sh
diff --git a/init.cfg b/init.cfg
index 55a75333c..82d70b77f 100644
--- a/init.cfg
+++ b/init.cfg
@@ -828,4 +828,13 @@ require_gnu_()
|| skip_ 'not running on GNU/Hurd'
}
+# Sequence derived from <https://datatracker.ietf.org/doc/rfc9839>.
+bad_unicode ()
+{
+ require_built_ printf
+
+ # invalid UTF8|unpaired surrogate|C1 control|noncharacter
+ env printf '\xC3|\xED\xBA\xAD|\u0089|\xED\xA6\xBF\xED\xBF\xBF\n'
+}
+
sanitize_path_
diff --git a/tests/fold/fold-characters.sh b/tests/fold/fold-characters.sh
index 0b399a1b6..b44276eaa 100755
--- a/tests/fold/fold-characters.sh
+++ b/tests/fold/fold-characters.sh
@@ -84,13 +84,14 @@ fold --characters input3 | tail -n 4 > out3 || fail=1
compare exp3 out3 || fail=1
# Sequence derived from <https://datatracker.ietf.org/doc/rfc9839>.
-bad_unicode ()
+bad_unicode_with_nul ()
{
# invalid UTF8|unpaired surrogate|NUL|C1 control|noncharacter
env printf '\xC3|\xED\xBA\xAD|\u0000|\u0089|\xED\xA6\xBF\xED\xBF\xBF\n'
}
-bad_unicode > /dev/null || framework_failure_
-test $({ bad_unicode | fold; bad_unicode; } | uniq | wc -l) = 1 || fail=1
+bad_unicode_with_nul > /dev/null || framework_failure_
+test $({ bad_unicode_with_nul | fold; \
+ bad_unicode_with_nul; } | uniq | wc -l) = 1 || fail=1
# Check bad character at EOF
test $(env printf '\xC3' | fold | wc -c) = 1 || fail=1
diff --git a/tests/local.mk b/tests/local.mk
index 5547a3f9a..074106e67 100644
--- a/tests/local.mk
+++ b/tests/local.mk
@@ -279,6 +279,7 @@ all_tests = \
tests/od/od.pl \
tests/od/od-endian.sh \
tests/od/od-float.sh \
+ tests/mktemp/bad-unicode.sh \
tests/misc/mktemp.pl \
tests/misc/arch.sh \
tests/pr/bounded-memory.sh \
diff --git a/tests/mktemp/bad-unicode.sh b/tests/mktemp/bad-unicode.sh
new file mode 100755
index 000000000..82cbff023
--- /dev/null
+++ b/tests/mktemp/bad-unicode.sh
@@ -0,0 +1,44 @@
+#!/bin/sh
+# Test 'mktemp' with bad Unicode characters.
+
+# Copyright (C) 2026 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
+print_ver_ mktemp
+
+for loc in C "$LOCALE_FR" "$LOCALE_FR_UTF8"; do
+ test -z "$loc" && continue
+ # Bad Unicode as a suffix.
+ file1=$(mktemp --suffix=$(bad_unicode)) || fail=1
+ dir1=$(mktemp -d --suffix=$(bad_unicode)) || fail=1
+ if test -z "$dir1"; then
+ # Bad Unicode in the argument to --tempdir.
+ mktemp --tmpdir="$dir1" || fail=1
+ mktemp -d --tmpdir="$dir1" || fail=1
+ # Bad Unicode in $TMPDIR.
+ TMPDIR="$dir1" mktemp || fail=1
+ TMPDIR="$dir1" mktemp -d || fail=1
+ # Bad Unicode in the argument to -t.
+ mktemp --tempdir='.' -t "$(bad_unicode)XXX" || fail=1
+ mktemp -d --tempdir='.' -t "$(bad_unicode)XXX" || fail=1
+ fi
+ for f in "$file1" "$dir1"; do
+ test -z "$f" && continue
+ rm -rf -- "$f" || framework_failure_
+ done
+done
+
+Exit $fail
--
2.52.0
