Use Haiku API to check if connection is up

Borrowed code from Haiku's Softwareupdater to more elegantly
check if the network is up. Much quicker!

Use a CopyToClipboard function as it's now used more than once.

Makefile

@@ -54,7 +54,7 @@ RSRCS =
 #	- 	if your library does not follow the standard library naming scheme,
 #		you need to specify the path to the library and it's name.
 #		(e.g. for mylib.a, specify "mylib.a" or "path/mylib.a")
-LIBS = be localestub $(STDCPPLIBS)
+LIBS = be localestub bnetapi $(STDCPPLIBS)
 
 #	Specify additional paths to directories following the standard libXXX.so
 #	or libXXX.a naming scheme. You can specify full paths or paths relative

main.cpp

@@ -2,11 +2,11 @@
  * Copyright 2018. All rights reserved.
  * Distributed under the terms of the MIT license.
  *
- * Authors:
+ * Author:
  *	Humdinger, humdingerb@gmail.com
- *	Werner Freytag, freytag@gmx.de
  *
  * Modified code from CopyNameToClipboard
+ * _CheckNetworkConnection() borrowed from SoftwareUpdater
  */
 
 #include <stdio.h>
@@ -15,13 +15,51 @@
 #include <Catalog.h>
 #include <Clipboard.h>
 #include <Entry.h>
+#include <NetworkInterface.h>
+#include <NetworkRoster.h>
 #include <Path.h>
 #include <String.h>
 
 #undef B_TRANSLATION_CONTEXT
 #define B_TRANSLATION_CONTEXT "Add-On"
 
 
+bool
+CheckNetworkConnection()
+{
+	BNetworkRoster& roster = BNetworkRoster::Default();
+	BNetworkInterface interface;
+	uint32 cookie = 0;
+	while (roster.GetNextInterface(&cookie, interface) == B_OK) {
+		uint32 flags = interface.Flags();
+		if ((flags & IFF_LOOPBACK) == 0
+			&& (flags & (IFF_UP | IFF_LINK)) == (IFF_UP | IFF_LINK)) {
+			return true;
+		}
+	}
+	// No network connection detected, cannot continue
+	return false;
+}
+
+
+void
+CopyToClipboard(BString text)
+{
+	ssize_t textLen = text.Length();
+	BMessage* message = (BMessage *)NULL;
+
+	if (be_clipboard->Lock()) {
+		be_clipboard->Clear();
+		if ((message = be_clipboard->Data())) {
+			message->AddData("text/plain", B_MIME_TYPE, text.String(),
+				textLen);
+			be_clipboard->Commit();
+		}
+		be_clipboard->Unlock();
+	}
+}
+
+
 extern "C" void
 process_refs(entry_ref directoryRef, BMessage* msg, void*)
 {
@@ -33,30 +71,16 @@ process_refs(entry_ref directoryRef, BMessage* msg, void*)
 		if (entry.IsDirectory()) {
 			BString text(B_TRANSLATE(
 				"UploadIt only works on a single file, no folders"));
-			ssize_t textLen = text.Length();
-			BMessage* message = (BMessage *)NULL;
-
-			if (be_clipboard->Lock()) {
-				be_clipboard->Clear();
-				if ((message = be_clipboard->Data())) {
-					message->AddData("text/plain", B_MIME_TYPE, text.String(),
-						textLen);
-					be_clipboard->Commit();
-				}
-				be_clipboard->Unlock();
-			}
+			CopyToClipboard(text);
+		} else if (CheckNetworkConnection() == false) {
+			BString text(B_TRANSLATE(
+				"Online upload service not available"));
+			CopyToClipboard(text);
 		} else {
 			entry.GetPath(&path);
 			BString command(
-				"stat=$(curl -m 2 -s -I http://google.com | grep HTTP/1 | awk {'print $2'}) ; "
-				"if [ -z  \"$stat\" ] ; then "	// network up in general?
-					"clipboard -c \"%ERROR%\" ; "
-				"else "
-					"curl -F'file=@'\"%FILENAME%\" https://0x0.st | clipboard -i ; "
-				"fi ; "
+				"curl -F'file=@'\"%FILENAME%\" https://0x0.st | clipboard -i ; "
 				"exit");
-			command.ReplaceAll("%ERROR%",
-				B_TRANSLATE("Online upload service not available"));
 			command.ReplaceAll("%FILENAME%", path.Path());
 			system(command.String());
 		}