core: add nm_utils_ascii_str_to_bool()

This is effectively the same as nm_config_parse_boolean(). The difference is,
that "nm-config.c" is not available to the interface-helper, thus any
code used by interface-helper (like "NetworkManager.c") cannot use this
function.

Still don't drop nm_config_parse_boolean() entirely, because it's better
to have the explicit notion of parsing a string in the config-context.

I ended up not using the function. But I'd still keep this patch.

src/NetworkManagerUtils.c

@@ -188,6 +188,40 @@ _nm_singleton_instance_register_destruction (GObject *instance)
 
 /*****************************************************************************/
 
+gint
+nm_utils_ascii_str_to_bool (const char *str,
+                            gint default_value)
+{
+	gsize len;
+	char *s = NULL;
+
+	if (!str)
+		return default_value;
+
+	while (str[0] && g_ascii_isspace (str[0]))
+		str++;
+
+	if (!str[0])
+		return default_value;
+
+	len = strlen (str);
+	if (g_ascii_isspace (str[len - 1])) {
+		s = g_strdup (str);
+		g_strchomp (s);
+		str = s;
+	}
+
+	if (!g_ascii_strcasecmp (str, "true") || !g_ascii_strcasecmp (str, "yes") || !g_ascii_strcasecmp (str, "on") || !g_ascii_strcasecmp (str, "1"))
+		default_value = TRUE;
+	else if (!g_ascii_strcasecmp (str, "false") || !g_ascii_strcasecmp (str, "no") || !g_ascii_strcasecmp (str, "off") || !g_ascii_strcasecmp (str, "0"))
+		default_value = FALSE;
+	if (s)
+		g_free (s);
+	return default_value;
+}
+
+/*****************************************************************************/
+
 /*
  * nm_ethernet_address_is_valid:
  * @addr: pointer to a binary or ASCII Ethernet address

src/NetworkManagerUtils.h

@@ -114,6 +114,11 @@ gboolean nm_utils_error_is_cancelled (GError *error,
 
 /*****************************************************************************/
 
+gint nm_utils_ascii_str_to_bool (const char *str,
+                                 gint default_value);
+
+/*****************************************************************************/
+
 gboolean nm_ethernet_address_is_valid (gconstpointer addr, gssize len);
 
 in_addr_t nm_utils_ip4_address_clear_host_address (in_addr_t addr, guint8 plen);

src/nm-config.c

@@ -126,32 +126,7 @@ gint
 nm_config_parse_boolean (const char *str,
                          gint default_value)
 {
-	gsize len;
+	return nm_utils_ascii_str_to_bool (str, default_value);
-	char *s = NULL;
-
-	if (!str)
-		return default_value;
-
-	while (str[0] && g_ascii_isspace (str[0]))
-		str++;
-
-	if (!str[0])
-		return default_value;
-
-	len = strlen (str);
-	if (g_ascii_isspace (str[len - 1])) {
-		s = g_strdup (str);
-		g_strchomp (s);
-		str = s;
-	}
-
-	if (!g_ascii_strcasecmp (str, "true") || !g_ascii_strcasecmp (str, "yes") || !g_ascii_strcasecmp (str, "on") || !g_ascii_strcasecmp (str, "1"))
-		default_value = TRUE;
-	else if (!g_ascii_strcasecmp (str, "false") || !g_ascii_strcasecmp (str, "no") || !g_ascii_strcasecmp (str, "off") || !g_ascii_strcasecmp (str, "0"))
-		default_value = FALSE;
-	if (s)
-		g_free (s);
-	return default_value;
 }
 
 gint