Replace memcmp() with pid_eq() and cid_eq()

Consistenly use the pid_eq() and cid_eq() helper functions. Move the
functions into utils.h (making them inline functions) because they are
used in multiple source files.

Signed-off-by: Michael Walle <michael@walle.cc>

clock.c

@@ -131,11 +131,6 @@ static void handle_state_decision_event(struct clock *c);
 static int clock_resize_pollfd(struct clock *c, int new_nports);
 static void clock_remove_port(struct clock *c, struct port *p);
 
-static int cid_eq(struct ClockIdentity *a, struct ClockIdentity *b)
-{
-	return 0 == memcmp(a, b, sizeof(*a));
-}
-
 static void remove_subscriber(struct clock_subscriber *s)
 {
 	LIST_REMOVE(s, list);
@@ -157,8 +152,8 @@ static void clock_update_subscription(struct clock *c, struct ptp_message *req,
 	}
 
 	LIST_FOREACH(s, &c->subscribers, list) {
-		if (!memcmp(&s->targetPortIdentity, &req->header.sourcePortIdentity,
-		            sizeof(struct PortIdentity))) {
+		if (pid_eq(&s->targetPortIdentity,
+			   &req->header.sourcePortIdentity)) {
 			/* Found, update the transport address and event
 			 * mask. */
 			if (!remove) {
@@ -196,8 +191,8 @@ static void clock_get_subscription(struct clock *c, struct ptp_message *req,
 	struct timespec now;
 
 	LIST_FOREACH(s, &c->subscribers, list) {
-		if (!memcmp(&s->targetPortIdentity, &req->header.sourcePortIdentity,
-			    sizeof(struct PortIdentity))) {
+		if (pid_eq(&s->targetPortIdentity,
+			   &req->header.sourcePortIdentity)) {
 			memcpy(bitmask, s->events, EVENT_BITMASK_CNT);
 			clock_gettime(CLOCK_MONOTONIC, &now);
 			if (s->expiration < now.tv_sec)

phc2sys.c

@@ -807,9 +807,8 @@ static int check_clock_identity(struct node *node, struct ptp_message *msg)
 {
 	if (!node->clock_identity_set)
 		return 1;
-	return !memcmp(&node->clock_identity,
-		       &msg->header.sourcePortIdentity.clockIdentity,
-		       sizeof(struct ClockIdentity));
+	return cid_eq(&node->clock_identity,
+		       &msg->header.sourcePortIdentity.clockIdentity);
 }
 
 static int is_msg_mgt(struct ptp_message *msg)

port.c

@@ -147,11 +147,6 @@ static int msg_source_equal(struct ptp_message *m1, struct foreign_clock *fc)
 	return 0 == memcmp(id1, id2, sizeof(*id1));
 }
 
-int pid_eq(struct PortIdentity *a, struct PortIdentity *b)
-{
-	return 0 == memcmp(a, b, sizeof(*a));
-}
-
 int source_pid_eq(struct ptp_message *m1, struct ptp_message *m2)
 {
 	return pid_eq(&m1->header.sourcePortIdentity,
@@ -418,7 +413,7 @@ static int net_sync_resp_append(struct port *p, struct ptp_message *m)
 	pid = dad->pds.parentPortIdentity.clockIdentity;
 	paddr = (struct PortAddress *)buf;
 
-	if (best && memcmp(&cid, &pid, sizeof(cid))) {
+	if (best && !cid_eq(&cid, &pid)) {
 		/* Extract the parent's protocol address. */
 		paddr->networkProtocol = transport_type(best->trp);
 		paddr->addressLength =
@@ -559,10 +554,11 @@ static int path_trace_ignore(struct port *p, struct ptp_message *m)
 		cnt = path_length(ptt);
 		cid = clock_identity(p->clock);
 		for (i = 0; i < cnt; i++) {
-			if (0 == memcmp(&ptt->cid[i], &cid, sizeof(cid)))
+			if (cid_eq(&ptt->cid[i], &cid)) {
 				return 1;
 			}
 		}
+	}
 	return 0;
 }
 
@@ -681,7 +677,7 @@ static int port_ignore(struct port *p, struct ptp_message *m)
 	c1 = clock_identity(p->clock);
 	c2 = m->header.sourcePortIdentity.clockIdentity;
 
-	if (0 == memcmp(&c1, &c2, sizeof(c1))) {
+	if (cid_eq(&c1, &c2)) {
 		return 1;
 	}
 	return 0;
@@ -724,7 +720,7 @@ static int port_sync_incapable(struct port *p)
 	}
 	cid = clock_identity(p->clock);
 	pid = clock_parent_identity(p->clock);
-	if (!memcmp(&cid, &pid.clockIdentity, sizeof(cid))) {
+	if (cid_eq(&cid, &pid.clockIdentity)) {
 		/*
 		 * We are the GM, but without gmCapable set.
 		 */
@@ -1854,7 +1850,7 @@ void process_follow_up(struct port *p, struct ptp_message *m)
 		break;
 	}
 	master = clock_parent_identity(p->clock);
-	if (memcmp(&master, &m->header.sourcePortIdentity, sizeof(master))) {
+	if (!pid_eq(&master, &m->header.sourcePortIdentity)) {
 		return;
 	}
 
@@ -2146,7 +2142,7 @@ void process_sync(struct port *p, struct ptp_message *m)
 		break;
 	}
 	master = clock_parent_identity(p->clock);
-	if (memcmp(&master, &m->header.sourcePortIdentity, sizeof(master))) {
+	if (!pid_eq(&master, &m->header.sourcePortIdentity)) {
 		return;
 	}
 

port_private.h

@@ -164,7 +164,6 @@ int process_pdelay_req(struct port *p, struct ptp_message *m);
 int process_pdelay_resp(struct port *p, struct ptp_message *m);
 void process_pdelay_resp_fup(struct port *p, struct ptp_message *m);
 void process_sync(struct port *p, struct ptp_message *m);
-int pid_eq(struct PortIdentity *a, struct PortIdentity *b);
 int source_pid_eq(struct ptp_message *m1, struct ptp_message *m2);
 void ts_add(tmv_t *ts, Integer64 correction);
 

tc.c

@@ -490,7 +490,7 @@ int tc_ignore(struct port *p, struct ptp_message *m)
 	c1 = clock_identity(p->clock);
 	c2 = m->header.sourcePortIdentity.clockIdentity;
 
-	if (0 == memcmp(&c1, &c2, sizeof(c1))) {
+	if (cid_eq(&c1, &c2)) {
 		return 1;
 	}
 	return 0;

util.h

@@ -59,6 +59,18 @@ char *bin2str_impl(Octet *data, int len, char *buf, int buf_len);
  */
 char *cid2str(struct ClockIdentity *id);
 
+/**
+ * Compare two clock identities for equality.
+ *
+ * @param a  First clock identity.
+ * @param b  Second clock identity.
+ * @return   1 if identities are equal, 0 otherwise.
+ */
+static inline int cid_eq(struct ClockIdentity *a, struct ClockIdentity *b)
+{
+	return memcmp(a, b, sizeof(*a)) == 0;
+}
+
 /**
  * Counts the number of occurrences of a given character.
  * @param str  String to evaluate.
@@ -80,6 +92,18 @@ char *pid2str(struct PortIdentity *id);
 
 char *portaddr2str(struct PortAddress *addr);
 
+/**
+ * Compare two port identities for equality.
+ *
+ * @param a  First port identity.
+ * @param b  Second port identity.
+ * @return   1 if identities are equal, 0 otherwise.
+ */
+static inline int pid_eq(struct PortIdentity *a, struct PortIdentity *b)
+{
+	return memcmp(a, b, sizeof(*a)) == 0;
+}
+
 /**
  * Scan a string containing a MAC address and convert it into binary form.
  *