resolved: rework logic so that we can share transactions between queries of different...

[elogind.git] / src / resolve / resolved-dns-answer.c

diff --git a/src/resolve/resolved-dns-answer.c b/src/resolve/resolved-dns-answer.c
new file mode 100644 (file)
index 0000000..fbc2825
--- /dev/null
+++ b/src/resolve/resolved-dns-answer.c
@@ -0,0 +1,76 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2014 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include "resolved-dns-answer.h"
+
+DnsAnswer *dns_answer_new(unsigned n) {
+        DnsAnswer *a;
+
+        assert(n > 0);
+
+        a = malloc0(offsetof(DnsAnswer, rrs) + sizeof(DnsResourceRecord*) * n);
+        if (!a)
+                return NULL;
+
+        a->n_ref = 1;
+        a->n_allocated = n;
+
+        return a;
+}
+
+DnsAnswer *dns_answer_ref(DnsAnswer *a) {
+        if (!a)
+                return NULL;
+
+        assert(a->n_ref > 0);
+        a->n_ref++;
+        return a;
+}
+
+DnsAnswer *dns_answer_unref(DnsAnswer *a) {
+        if (!a)
+                return NULL;
+
+        assert(a->n_ref > 0);
+
+        if (a->n_ref == 1) {
+                unsigned i;
+
+                for (i = 0; i < a->n_rrs; i++)
+                        dns_resource_record_unref(a->rrs[i]);
+
+                free(a);
+        } else
+                a->n_ref--;
+
+        return NULL;
+}
+
+int dns_answer_add(DnsAnswer *a, DnsResourceRecord *rr) {
+        assert(a);
+        assert(rr);
+
+        if (a->n_rrs >= a->n_allocated)
+                return -ENOSPC;
+
+        a->rrs[a->n_rrs++] = dns_resource_record_ref(rr);
+        return 0;
+}