Add get_architectures() and C++ versions

* get_architectures() returns the primary and the secondary
  architectures in one array. That turned out to be convenient.
* Add C++ versions for get[_secondary]_architectures(), returning a
  BStringList.

headers/os/support/Architecture.h

@@ -18,10 +18,25 @@ const char*	get_architecture();
 const char*	get_primary_architecture();
 size_t		get_secondary_architectures(const char** architectures,
 				size_t count);
+size_t		get_architectures(const char** architectures, size_t count);
 const char*	guess_architecture_for_path(const char* path);
 
 
 __END_DECLS
 
 
+/* C++ API */
+#ifdef __cplusplus
+
+
+#include <StringList.h>
+
+
+status_t	get_secondary_architectures(BStringList& _architectures);
+status_t	get_architectures(BStringList& _architectures);
+
+
+#endif
+
+
 #endif	/* _SUPPORT_ARCHITECTURE_H */

headers/private/system/architecture_private.h

@@ -16,6 +16,7 @@ const char*	__get_architecture();
 const char*	__get_primary_architecture();
 size_t		__get_secondary_architectures(const char** architectures,
 				size_t count);
+size_t		__get_architectures(const char** architectures, size_t count);
 const char*	__guess_architecture_for_path(const char* path);
 
 

src/kits/support/Architecture.cpp

@@ -0,0 +1,53 @@
+/*
+ * Copyright 2013, Ingo Weinhold, ingo_weinhold@gmx.de.
+ * Distributed under the terms of the MIT License.
+ */
+
+
+#include <Architecture.h>
+
+#include <algorithm>
+
+#include <StringList.h>
+
+
+static const size_t kMaxArchitectureCount = 16;
+
+
+static status_t
+string_array_to_string_list(const char* const* architectures, size_t count,
+	BStringList& _architectures)
+{
+	_architectures.MakeEmpty();
+
+	for (size_t i = 0; i < count; i++) {
+		BString architecture(architectures[i]);
+		if (architecture.IsEmpty() || !_architectures.Add(architecture)) {
+			_architectures.MakeEmpty();
+			return B_NO_MEMORY;
+		}
+	}
+
+	return B_OK;
+}
+
+
+status_t
+get_secondary_architectures(BStringList& _architectures)
+{
+	const char* architectures[kMaxArchitectureCount];
+	size_t count = get_secondary_architectures(architectures,
+		kMaxArchitectureCount);
+	return string_array_to_string_list(architectures,
+		std::min(count, kMaxArchitectureCount), _architectures);
+}
+
+
+status_t
+get_architectures(BStringList& _architectures)
+{
+	const char* architectures[kMaxArchitectureCount];
+	size_t count = get_architectures(architectures, kMaxArchitectureCount);
+	return string_array_to_string_list(architectures,
+		std::min(count, kMaxArchitectureCount), _architectures);
+}

src/kits/support/Jamfile

@@ -10,6 +10,7 @@ for architectureObject in [ MultiArchSubDirSetup ] {
 		local architecture = $(TARGET_PACKAGING_ARCH) ;
 
 		MergeObject <libbe!$(architecture)>support_kit.o :
+			Architecture.cpp
 			Archivable.cpp
 			ArchivingManagers.cpp
 			Beep.cpp

src/system/libroot/os/Architecture.cpp

@@ -85,6 +85,17 @@ __get_secondary_architectures(const char** architectures, size_t count)
 }
 
 
+size_t
+__get_architectures(const char** architectures, size_t count)
+{
+	if (count == 0)
+		return __get_secondary_architectures(NULL, 0) + 1;
+
+	architectures[0] = __get_primary_architecture();
+	return __get_secondary_architectures(architectures + 1, count -1) + 1;
+}
+
+
 const char*
 __guess_architecture_for_path(const char* path)
 {
@@ -114,4 +125,5 @@ __guess_architecture_for_path(const char* path)
 B_DEFINE_WEAK_ALIAS(__get_architecture, get_architecture);
 B_DEFINE_WEAK_ALIAS(__get_primary_architecture, get_primary_architecture);
 B_DEFINE_WEAK_ALIAS(__get_secondary_architectures, get_secondary_architectures);
+B_DEFINE_WEAK_ALIAS(__get_architectures, get_architectures);
 B_DEFINE_WEAK_ALIAS(__guess_architecture_for_path, guess_architecture_for_path);