Code cleanup

src/common.c

@@ -1,8 +1,27 @@
 #include "common.h"
 
 #include <stdio.h>
+#include <stdarg.h>
 
-void gt_not_available (const char *name)
+void gt_log (const char *fmt, ...)
 {
-    fprintf(stderr, "%s is not available on your platform!\n", name);
+    va_list ap;
+    va_start(ap, fmt);
+    vfprintf(stderr, fmt, ap);
+    va_end(ap);
+}
+
+void gt_fatal (const char *fmt, ...)
+{
+    va_list ap;
+    va_start(ap, fmt);
+    vfprintf(stderr, fmt, ap);
+    va_end(ap);
+
+    exit(EXIT_FAILURE);
+}
+
+void gt_na (const char *name)
+{
+    gt_log("%s is not available on your platform!\n", name);
 }