+ printf '100%%\n'
+}
+
+check_for_hard_links () {
+ set +e
+
+ printf '' > "${MH_TEST_DIR}/$$-1"
+ if link "${MH_TEST_DIR}/$$-1" "${MH_TEST_DIR}/$$-2" 2>/dev/null; then
+ hard_links_supported=1
+ else
+ hard_links_supported=0
+ fi
+ rm -f "${MH_TEST_DIR}/$$-1" "${MH_TEST_DIR}/$$-2"
+
+ set -e
+}
+
+#### check() requires two arguments, each the name of a file to be
+#### diff'ed.
+#### If the same, the second file is removed. And the first file is
+#### removed unless the optional third argument has a value of
+#### 'keep first'.
+#### If different, global variable "failed" is incremented.
+check() {
+ #### POSIX diff should support -c.
+ if diff -c "$1" "$2"; then
+ test $# -lt 3 -o "$3" != 'keep first' && rm -f "$1"
+ rm -f "$2"
+ else
+ echo "$0: test failed, outputs are in $1 and $2."
+ failed=`expr ${failed:-0} + 1`
+ fi
+}
+
+#### run_test() requires two arguments, the first is a program and
+#### arguments, the second is its expected one-line output string.
+#### If the actual output does not match that string:
+#### an error message is printed and global variable "failed" is incremented;
+#### if there is an optional third argument, it is used in the error message.
+run_test() {
+ set +e
+ actual_output=`$1 2>&1`
+ set -e
+ if test x"$actual_output" != x"$2"; then
+ echo "$0: ${3:-\"$1\"} expected:" 1>&2
+ echo " '$2'" 1>&2
+ echo "but instead got:" 1>&2
+ echo " '$actual_output'" 1>&2
+ failed=`expr ${failed:-0} + 1`
+ fi