CA fixes

Author: nefarius

src/dinput_backend.h

@@ -41,6 +41,7 @@ class DInputBackend final : public IInputBackend
 	 * Human-readable display name for a specific slot.
 	 * @param slot Index of the input slot to query.
 	 * @returns Pointer to a null-terminated string describing the slot or its assigned device.
+	 *          May return nullptr when no slot/device mapping exists or when no name is available.
 	 */
 	void Poll() override;
 	[[nodiscard]] int GetMaxSlots() const override;

src/hidapi_backend.h

@@ -41,7 +41,7 @@ class HidApiBackend final : public IInputBackend
 	/**
 	 * Get a human-readable display name for the device assigned to a slot.
 	 * @param slot Index of the slot to query; valid range is 0 .. GetMaxSlots()-1.
-	 * @returns Null-terminated display name for the slot, or an empty string if none.
+	 * @returns A null-terminated display name for the slot, or nullptr when no name is available.
 	 */
 
 	/**

src/rawinput_backend.cpp

@@ -86,6 +86,8 @@ const char* RawInputBackend::GetSlotDisplayName(int slot) const
 
 PHIDP_PREPARSED_DATA RawInputBackend::PP(DeviceInfo& d)
 {
+	if (d.preparsedBuf.empty())
+		return nullptr;
 	return reinterpret_cast<PHIDP_PREPARSED_DATA>(d.preparsedBuf.data());
 }
 

src/rawinput_backend.h

@@ -46,7 +46,8 @@ class RawInputBackend final : public IInputBackend
 	 * Return the display name for a specific slot.
 	 *
 	 * @param slot Index of the slot to query (0-based).
-	 * @returns A null-terminated string containing the display name for the slot, or an empty string if none.
+	 * @returns A null-terminated string on success; nullptr when no display name is available.
+	 *          The returned pointer is valid for the lifetime of this backend; caller does not take ownership.
 	 */
 
 	/**