libdns: Avoid using compound literals (7).

* dirmngr/dns.h (DNS_OPTS_INIT, dns_opts): Remove.
* dirmngr/dns-stuff.c (libdns_res_open): Use zero-ed, and initialized
automatic variable for opts.
* dirmngr/dns.c (send_query, resolve_query, resolve_addrinfo):
Likewise.

--

In fact, DNS_OPTS_INIT was only needed when args are none.  With
partially specified initialization, C99 guarantees zero-ed other
members just like static object.

Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>

dirmngr/dns-stuff.c

@@ -701,6 +701,11 @@ libdns_res_open (ctrl_t ctrl, struct dns_resolver **r_res)
   gpg_error_t err;
   struct dns_resolver *res;
   int derr;
+  struct dns_options opts = { 0 };
+
+  opts.socks_host     = &libdns.socks_host;
+  opts.socks_user     = tor_socks_user;
+  opts.socks_password = tor_socks_password;
 
   *r_res = NULL;
 
@@ -726,10 +731,7 @@ libdns_res_open (ctrl_t ctrl, struct dns_resolver **r_res)
     set_dns_timeout (0);
 
   res = dns_res_open (libdns.resolv_conf, libdns.hosts, libdns.hints, NULL,
-                      dns_opts (.socks_host     = &libdns.socks_host,
-                                .socks_user     = tor_socks_user,
-                                .socks_password = tor_socks_password ),
-                      &derr);
+                      &opts, &derr);
   if (!res)
     return libdns_error_to_gpg_error (derr);
 

dirmngr/dns.c

@@ -10943,6 +10943,7 @@ static int send_query(int argc, char *argv[]) {
 	struct sockaddr_storage ss;
 	struct dns_socket *so;
 	int error, type;
+	struct dns_options opts = { 0 };
 
 	memset(&ss, 0, sizeof ss);
 	if (argc > 1) {
@@ -10977,7 +10978,7 @@ static int send_query(int argc, char *argv[]) {
 
 	fprintf(stderr, "querying %s for %s IN %s\n", host, MAIN.qname, dns_strtype(MAIN.qtype));
 
-	if (!(so = dns_so_open((struct sockaddr *)&resconf()->iface, type, dns_opts(), &error)))
+	if (!(so = dns_so_open((struct sockaddr *)&resconf()->iface, type, &opts, &error)))
 		panic("dns_so_open: %s", dns_strerror(error));
 
 	while (!(A = dns_so_query(so, Q, (struct sockaddr *)&ss, &error))) {
@@ -11061,6 +11062,11 @@ static int resolve_query(int argc DNS_NOTUSED, char *argv[]) {
 	struct dns_packet *ans;
 	const struct dns_stat *st;
 	int error;
+	struct dns_options opts = { 0 };
+
+	opts.socks_host = &MAIN.socks_host;
+	opts.socks_user = MAIN.socks_user;
+	opts.socks_password = MAIN.socks_password;
 
 	if (!MAIN.qname)
 		MAIN.qname = "www.google.com";
@@ -11070,9 +11076,7 @@ static int resolve_query(int argc DNS_NOTUSED, char *argv[]) {
 	resconf()->options.recurse = recurse;
 
 	if (!(R = dns_res_open(resconf(), hosts(), dns_hints_mortal(hints(resconf(), &error)), cache(),
-			       dns_opts(.socks_host=&MAIN.socks_host,
-					.socks_user=MAIN.socks_user,
-					.socks_password=MAIN.socks_password), &error)))
+			       &opts, &error)))
 		panic("%s: %s", MAIN.qname, dns_strerror(error));
 
 	dns_res_settrace(R, trace("w+b"));
@@ -11116,6 +11120,7 @@ static int resolve_addrinfo(int argc DNS_NOTUSED, char *argv[]) {
 	struct addrinfo *ent;
 	char pretty[512];
 	int error;
+	struct dns_options opts = { 0 };
 
 	if (!MAIN.qname)
 		MAIN.qname = "www.google.com";
@@ -11123,7 +11128,7 @@ static int resolve_addrinfo(int argc DNS_NOTUSED, char *argv[]) {
 
 	resconf()->options.recurse = recurse;
 
-	if (!(res = dns_res_open(resconf(), hosts(), dns_hints_mortal(hints(resconf(), &error)), cache(), dns_opts(), &error)))
+	if (!(res = dns_res_open(resconf(), hosts(), dns_hints_mortal(hints(resconf(), &error)), cache(), &opts, &error)))
 		panic("%s: %s", MAIN.qname, dns_strerror(error));
 
 	if (!(ai = dns_ai_open(MAIN.qname, "80", MAIN.qtype, &ai_hints, res, &error)))

dirmngr/dns.h

@@ -1032,9 +1032,6 @@ DNS_PUBLIC void dns_cache_close(struct dns_cache *);
 
 #define DNS_OPTS_INITIALIZER_ { 0, 0 }, 0, 0
 #define DNS_OPTS_INITIALIZER  { DNS_OPTS_INITIALIZER_ }
-#define DNS_OPTS_INIT(...)    { DNS_OPTS_INITIALIZER_, __VA_ARGS__ }
-
-#define dns_opts(...) (&dns_quietinit((struct dns_options)DNS_OPTS_INIT(__VA_ARGS__)))
 
 struct dns_options {
 	/*