Add NK_login_enum to the C API

As with the C++ API, identifying the model by the first character of a
string is not intuitive.  This patch adds the NK_login_enum function to
the C API that accepts an enum value instead of a string.  It also adds
a new enum NK_device_model as device::DeviceModel is an enum class and
therefore cannot be used in C.

1 files changed, 16 insertions, 0 deletions

diff --git a/NK_C_API.cc b/NK_C_API.cc
index 64355f5..b245940 100644
--- a/NK_C_API.cc
+++ b/NK_C_API.cc
@@ -161,6 +161,22 @@ extern "C" {
 		return 0;
 	}
 
+        NK_C_API int NK_login_enum(NK_device_model device_model) {
+                const char *model_string;
+                switch (device_model) {
+                    case NK_PRO:
+                        model_string = "P";
+                        break;
+                    case NK_STORAGE:
+                        model_string = "S";
+                        break;
+                    default:
+                        /* no such enum value -- return error code */
+                        return 0;
+                }
+                return NK_login(model_string);
+        }
+
 	NK_C_API int NK_logout() {
 		auto m = NitrokeyManager::instance();
 		return get_without_result([&]() {