-/** compute the minimum of \a a and \a b */
-#define PARA_MIN(a,b) ((a) < (b) ? (a) : (b))
-/** compute the maximum of \a a and \a b */
-#define PARA_MAX(a,b) ((a) > (b) ? (a) : (b))
-/** compute the absolute value of \a a */
-#define PARA_ABS(a) ((a) > 0 ? (a) : -(a))
-
-/** debug loglevel, gets really noisy */
-#define DEBUG 1
-/** still noisy, but won't fill your disk */
-#define INFO 2
-/** normal, but significant event */
-#define NOTICE 3
-/** unexpected event that can be handled */
-#define WARNING 4
-/** unhandled error condition */
-#define ERROR 5
-/** system might be unreliable */
-#define CRIT 6
-/** last message before exit */
-#define EMERG 7
+/** Compute the minimum of \a x and \a y. */
+#define PARA_MIN(x, y) ({ \
+ typeof(x) _min1 = (x); \
+ typeof(y) _min2 = (y); \
+ (void) (&_min1 == &_min2); \
+ _min1 < _min2 ? _min1 : _min2; })
+
+/** Compute the maximum of \a x and \a y. */
+#define PARA_MAX(x, y) ({ \
+ typeof(x) _max1 = (x); \
+ typeof(y) _max2 = (y); \
+ (void) (&_max1 == &_max2); \
+ _max1 < _max2 ? _max2 : _max1; })
+
+/** Compute the absolute value of \a x. */
+#define PARA_ABS(x) ({ \
+ typeof(x) _x = (x); \
+ _x > 0? _x : -_x; })
+
+/** Debug loglevel, gets really noisy. */
+#define LL_DEBUG 0
+/** Still noisy, but won't fill your disk. */
+#define LL_INFO 1
+/** Normal, but significant event. */
+#define LL_NOTICE 2
+/** Unexpected event that can be handled. */
+#define LL_WARNING 3
+/** Unhandled error condition. */
+#define LL_ERROR 4
+/** System might be unreliable. */
+#define LL_CRIT 5
+/** Last message before exit. */
+#define LL_EMERG 6
+/** Number of all loglevels. */
+#define NUM_LOGLEVELS 7