suppress duplicate reports with -c/-C and -q/-Q

If fping receives a duplicate Echo Reply packet, it reports
this.  This report was suppressed for loop mode, and for
other operating modes where each receive event is reported.
Now, this duplicate report is also suppressed when in count
mode with options -q, --quiet or -Q, --squiet.

This addresses GitHub issue #389.

Author: auerswal

CHANGELOG.md

@@ -24,6 +24,9 @@ Next
 - Options --print-tos and --print-ttl now also work for IPv6, and no
   longer require privileges (#384, thanks @auerswal)
 
+- Suppress duplicate reports in count mode with -q, --quiet or -Q, --squiet
+  (#392, thanks @gsnw-sebast and @auerswal)
+
 fping 5.3 (2025-01-02)
 ======================
 

src/fping.c

@@ -2816,7 +2816,7 @@ int wait_for_reply(int64_t wait_time)
     }
 
     /* discard duplicates */
-    if (!loop_flag && h->resp_times[this_count] >= 0) {
+    if (!loop_flag && !(count_flag && quiet_flag) && h->resp_times[this_count] >= 0) {
         if (!per_recv_flag) {
             fprintf(stderr, "%s : duplicate for [%d], %d bytes, %s ms",
                 h->host, this_count, result, sprint_tm(this_reply));