Improved way of getting the next SIP extension

src/freedombone-sipfreeext

@@ -31,27 +31,12 @@
 
 CONFIG_FILE=/etc/sipwitch.conf
 
-extensions=()
-
-# get the used extensions
-IFS=''
-for line in $(cat $CONFIG_FILE | grep "extension"); do
-    extnum=$(echo "$line" | awk -F '>' '{print $2}' | awk -F '<' '{print $1}')
-    extensions+=($extnum)
-done
-
-# find the max extension number
 maxnum=201
-for i in ${extensions[@]}; do
+while (( maxnum < 299 )); do
-    if [ $i -gt $maxnum ]; then
+	if ! grep -q "extension>$maxnum<" $CONFIG_FILE; then
-        maxnum=$i
+		break;
-        break
+	fi
-    fi
+	maxnum=$((maxnum + 1))
 done
-
+echo $maxnum
-if [ $maxnum -gt 299 ]; then
-	exit 1
-fi
-
-echo $(($maxnum + 1))
 exit 0