resolved: if dns_packet_append_answer() fails count how many RRs were successfully added

This is useful later when handling the truncation case: if we can't add
all RRs we'd like to add we need to set the TC bit, but still report the
number of RRs we added (and not the number of RRs we would have liked to
add) to the packet.

1 files changed, 4 insertions, 1 deletions

diff --git a/src/resolve/resolved-dns-packet.c b/src/resolve/resolved-dns-packet.c
index b75b77760a..59be55a0eb 100644
--- a/src/resolve/resolved-dns-packet.c
+++ b/src/resolve/resolved-dns-packet.c
@@ -1215,7 +1215,7 @@ int dns_packet_append_question(DnsPacket *p, DnsQuestion *q) {
         return 0;
 }
 
-int dns_packet_append_answer(DnsPacket *p, DnsAnswer *a) {
+int dns_packet_append_answer(DnsPacket *p, DnsAnswer *a, unsigned *completed) {
         DnsResourceRecord *rr;
         DnsAnswerFlags flags;
         int r;
@@ -1226,6 +1226,9 @@ int dns_packet_append_answer(DnsPacket *p, DnsAnswer *a) {
                 r = dns_packet_append_rr(p, rr, flags, NULL, NULL);
                 if (r < 0)
                         return r;
+
+                if (completed)
+                        (*completed)++;
         }
 
         return 0;