Implement roughly.

util.c

@@ -63,6 +63,12 @@ seqno_plus(unsigned short s, int plus)
     return ((s + plus) & 0xFFFF);
 }
 
+int
+roughly(int value)
+{
+    return value * 3 / 4 + random() % (value / 2);
+}
+
 /* Like gettimeofday, but should return monotonic time.  If POSIX clocks
    are not available, falls back to gettimeofday. */
 int

util.h

@@ -26,6 +26,7 @@ int seqno_minus(unsigned short s1, unsigned short s2)
     ATTRIBUTE ((const));
 unsigned short seqno_plus(unsigned short s, int plus)
     ATTRIBUTE ((const));
+int roughly(int value);
 int gettime(struct timeval *tv);
 void timeval_minus(struct timeval *d,
                    const struct timeval *s1, const struct timeval *s2);