Added a function to check if specific OS features are available

linux.c, macos.c, windows.c now contain
subsurface_os_feature_available() that can accept an enum type
os_feature_t defined in dive.h.

The function can be useful to check if a specific global feature
is available on a certain OS version.

Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 15 insertions, 0 deletions

diff --git a/windows.c b/windows.c
index 1c8cd0a01..2127614bd 100644
--- a/windows.c
+++ b/windows.c
@@ -223,3 +223,18 @@ void subsurface_command_line_exit(gint *argc, gchar ***argv)
 		g_free((*argv)[i]);
 	g_free(*argv);
 }
+
+/* check if we are running a newer OS version */
+gboolean subsurface_os_feature_available(os_feature_t f)
+{
+	switch (f) {
+	case UTF8_FONT_WITH_STARS:
+		if ((GetVersion() & 0xff) < 6)
+			return FALSE; /* version less than Vista */
+		else
+			return TRUE;
+		break;
+	default:
+		return TRUE;
+	}
+}