AMIGAOS: Preparations for use with AmiUpdate

Adding a bit of code to make ScummVM AmiUpdate aware.
Everything else will be dealt with through a (yet to finish) AmigaOS installer script and the entries in AmiUpdate's database.

I'd like to ask for hints regarding
- Code Formatting
- Optimizations
- Comments
- Obivous errors
or
- Ill-designed code.

It's not much code, but i'm sure i still messed up glorious either way

1 files changed, 33 insertions, 2 deletions

diff --git a/backends/platform/sdl/amigaos/amigaos-main.cpp b/backends/platform/sdl/amigaos/amigaos-main.cpp
index 65da6bbf85..7117efc310 100644
--- a/backends/platform/sdl/amigaos/amigaos-main.cpp
+++ b/backends/platform/sdl/amigaos/amigaos-main.cpp
@@ -24,13 +24,44 @@
 
 #if defined(__amigaos4__)
 
+#include "backends/fs/amigaos4/amigaos4-fs.h"
 #include "backends/platform/sdl/amigaos/amigaos.h"
 #include "backends/plugins/sdl/sdl-provider.h"
 #include "base/main.h"
 
 int main(int argc, char *argv[]) {
 
-	// Set up a stack cookie to avoid crashes due to too few stack set by users 
+	// The following will gather the application name and add the install path
+	// to a variable in AmigaOS4's ENV(ARC) system. It will be placed in AppPaths
+	// so that ScummVM can become AmiUpdate aware
+	const char *const appname = "ScummVM";
+
+	BPTR lock;
+	APTR oldwin;
+
+		// Obtain the lock to the home directory
+		if(( lock = IDOS->GetProgramDir() )) {
+			TEXT progpath[2048];
+			TEXT apppath[1024] = "AppPaths";
+
+			if( IDOS->DevNameFromLock( lock,
+				progpath,
+				sizeof(progpath),
+				DN_FULLPATH )) {
+
+			// Stop any "Insert volume..." type requesters
+			oldwin = IDOS->SetProcWindow((APTR)-1);
+
+			// Finally, set the variable to the path the executable was run from
+			IDOS->AddPart( apppath, appname, 1024);
+			IDOS->SetVar( apppath, progpath, -1, GVF_GLOBAL_ONLY|GVF_SAVE_VAR );
+
+			// Turn system requesters back on
+			IDOS->SetProcWindow( oldwin );
+			}
+		}
+
+	// Set up a stack cookie to avoid crashes from a stack set too low
 	static const char *stack_cookie __attribute__((used)) = "$STACK: 600000";
 
 	// Create our OSystem instance
@@ -44,7 +75,7 @@ int main(int argc, char *argv[]) {
 	PluginManager::instance().addPluginProvider(new SDLPluginProvider());
 #endif
 
-	// Invoke the actual ScummVM main entry point:
+	// Invoke the actual ScummVM main entry point
 	int res = scummvm_main(argc, argv);
 
 	// Free OSystem