modem-helpers: new helper to convert from netmask string to CIDR

src/mm-modem-helpers.c

@@ -22,6 +22,7 @@
 #include <string.h>
 #include <ctype.h>
 #include <stdlib.h>
+#include <arpa/inet.h>
 
 #include <ModemManager.h>
 #include <libmm-common.h>
@@ -135,6 +136,17 @@ mm_create_device_identifier (guint vid,
 
 /*****************************************************************************/
 
+guint
+mm_netmask_to_cidr (const gchar *netmask)
+{
+    guint32 num = 0;
+
+    inet_pton (AF_INET, netmask, &num);
+    return mm_count_bits_set (num);
+}
+
+/*****************************************************************************/
+
 /* +CREG: <stat>                      (GSM 07.07 CREG=1 unsolicited) */
 #define CREG1 "\\+(CREG|CGREG):\\s*0*([0-9])"
 

src/mm-modem-helpers.h

@@ -58,6 +58,8 @@ gchar *mm_create_device_identifier (guint vid,
                                     const gchar *model,
                                     const gchar *manf);
 
+guint mm_netmask_to_cidr (const gchar *netmask);
+
 /*****************************************************************************/
 /* 3GPP specific helpers and utilities */
 /*****************************************************************************/