1 files changed, 61 insertions, 0 deletions
diff --git a/tmac/tests/s_rejects-too-short-page-lengths.sh b/tmac/tests/s_rejects-too-short-page-lengths.sh
new file mode 100755
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--- /dev/null
+++ b/tmac/tests/s_rejects-too-short-page-lengths.sh
@@ -0,0 +1,61 @@
+#!/bin/sh
+#
+# Copyright (C) 2022 Free Software Foundation, Inc.
+#
+# This file is part of groff.
+#
+# groff 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.
+#
+# groff 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 <http://www.gnu.org/licenses/>.
+#
+
+groff="${abs_top_builddir:-.}/test-groff"
+
+# Page lengths that are too short cause loss of header/footer text and
+# infinite trap recursion in extreme cases.
+#
+# As of the time of this writing, bad behavior (a superfluous page
+# break) sets in at 14v, and we start to lose headers/footers at a
+# length of 13v.  Get down to 7v and the traps infinitely recurse.
+
+input='.pl 7v
+.ds CF footer
+.P1 \" ensure header on page 1
+.LP
+foobar
+'
+
+fail=
+
+wail () {
+    echo "...FAILED" >&2
+    fail=YES
+}
+
+output=$(printf '%s\n' "$input" | "$groff" -Tascii -P-cbou -ms 2>&1)
+status=$?
+
+echo "checking for nonzero exit status" >&2
+test $status -ne 0 || wail
+
+# grepping diagnostic messages is a tar pit.  I hope I don't come to
+# regret this.
+
+echo "checking for lack of diagnostic about infinite loop" >&2
+echo "$output" | grep -q 'troff.*fatal.*infinite' && wail
+
+echo "checking for diagnostic about page length" >&2
+echo "$output" | grep -q 's\.tmac.*page length' || wail
+
+test -z "$fail"
+
+# vim:set ai et sw=4 ts=4 tw=72: