pm3: stop as soon as enough devs found

pm3

@@ -26,10 +26,14 @@ PM3LIST=()
 SHOWLIST=false
 
 function get_pm3_list_Linux {
+    N=$1
     PM3LIST=()
     for DEV in $(find /dev/ttyACM* 2>/dev/null); do
         if udevadm info -q property -n "$DEV" |grep -q "ID_VENDOR=proxmark.org"; then
             PM3LIST+=("$DEV")
+            if [ ${#PM3LIST[*]} -ge $N ]; then
+                return
+            fi
         fi
     done
     if $FINDBTDONGLE; then
@@ -37,6 +41,9 @@ function get_pm3_list_Linux {
         for DEV in $(find /dev/ttyUSB* 2>/dev/null); do
             if udevadm info -q property -n "$DEV" |grep -q "ID_MODEL=CP2104_USB_to_UART_Bridge_Controller"; then
                 PM3LIST+=("$DEV")
+                if [ ${#PM3LIST[*]} -ge $N ]; then
+                    return
+                fi
             fi
         done
     fi
@@ -48,25 +55,36 @@ function get_pm3_list_Linux {
             # check if Proxmark3 is actually present
             if hcitool name "$MAC" | grep -q "PM3"; then
                 PM3LIST+=("/dev/$DEV")
+                if [ ${#PM3LIST[*]} -ge $N ]; then
+                    return
+                fi
             fi
         done
     fi
 }
 
 function get_pm3_list_macOS {
+    N=$1
     PM3LIST=()
     for DEV in $(ioreg -r -c "IOUSBHostDevice" -l|awk -F '"' '
         $2=="USB Vendor Name"{b=($4=="proxmark.org")}
         b==1 && $2=="IODialinDevice"{print $4}'); do
         PM3LIST+=("$DEV")
+        if [ ${#PM3LIST[*]} -ge $N ]; then
+            return
+        fi
     done
 }
 
 function get_pm3_list_Windows {
+    N=$1
     PM3LIST=()
     for DEV in $(wmic path Win32_SerialPort where "PNPDeviceID like '%VID_9AC4&PID_4B8F%'" get DeviceID,PNPDeviceID 2>/dev/null|awk '/^COM/{print $1}'); do
         DEV=${DEV/ */}
         PM3LIST+=("$DEV")
+        if [ ${#PM3LIST[*]} -ge $N ]; then
+            return
+        fi
     done
 }
 
@@ -82,6 +100,9 @@ function get_pm3_list_WSL {
                 echo "[!!] Let's give users read/write access to $DEV"
                 sudo chmod 666 "$DEV"
             fi
+            if [ ${#PM3LIST[*]} -ge $N ]; then
+                return
+            fi
         fi
     done
 }
@@ -265,7 +286,8 @@ else
 fi
 
 if $SHOWLIST; then
-    $GETPM3LIST
+    # Probe for up to 9 devs
+    $GETPM3LIST 9
     if [ ${#PM3LIST} -lt 1 ]; then
         echo "[!!] No port found"
         exit 0
@@ -280,7 +302,7 @@ if $SHOWLIST; then
 fi
 
 # Wait till we get at least N proxmark3 devices
-$GETPM3LIST
+$GETPM3LIST $N
 if [ ${#PM3LIST} -lt $N ]; then
     echo >&2 "[=] Waiting for Proxmark3 to appear..."
 fi
@@ -289,7 +311,7 @@ while true; do
         break
     fi
     sleep .1
-    $GETPM3LIST
+    $GETPM3LIST $N
 done
 
 if [ ${#PM3LIST} -lt $N ]; then