fix bashisms in testsuite/

These places use ${var/search/replace}, $((n++) and
`type -p' constructs which are not-so-standard.
Replace with equivalent constructs.

Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

testsuite/hostid/hostid-works

@@ -1,8 +1,6 @@
 h=x$(busybox hostid)
 # Is $h a sequence of hex numbers?
-x="${h//[0123456789abcdef]/x}"
-x="${x//xxx/x}"
-x="${x//xxx/x}"
-x="${x//xxx/x}"
-x="${x//xx/x}"
-test x"$x" = x"x"
+case "$h" in
+ x*[!0-9a-f]*) false;;
+ *) true;;
+esac

testsuite/md5sum.tests

@@ -30,7 +30,7 @@ result=`(
 n=0
 while test $n -le 999; do
 	echo "$text" | head -c $n | "$sum"
-	: $((n++))
+	n=$(($n+1))
 done | "$sum"
 )`
 

testsuite/testing.sh

@@ -56,10 +56,10 @@ optional()
 {
 	SKIP=
 	while test "$1"; do
-		if test x"${OPTIONFLAGS/*:$1:*/y}" != x"y"; then
-			SKIP=1
-			return
-		fi
+		case "${OPTIONFLAGS}" in
+			*:$1:*) ;;
+			*) SKIP=1; return ;;
+		esac
 		shift
 	done
 }

testsuite/which/which-uses-default-path

@@ -1,4 +1,4 @@
-BUSYBOX=$(type -p busybox)
+BUSYBOX=$(command -pv busybox)
 SAVED_PATH=$PATH
 unset PATH
 $BUSYBOX which ls