cleanup: Add more const where possible.

other/DHT_bootstrap.c

@@ -61,7 +61,7 @@ static bool manage_keys(DHT *dht)
     if (keys_file != nullptr) {
         /* If file was opened successfully -- load keys,
            otherwise save new keys */
-        size_t read_size = fread(keys, sizeof(uint8_t), KEYS_SIZE, keys_file);
+        const size_t read_size = fread(keys, sizeof(uint8_t), KEYS_SIZE, keys_file);
 
         if (read_size != KEYS_SIZE) {
             printf("Error while reading the key file\nExiting.\n");
@@ -134,7 +134,7 @@ int main(int argc, char *argv[])
 
     /* let user override default by cmdline */
     bool ipv6enabled = TOX_ENABLE_IPV6_DEFAULT; /* x */
-    int argvoffset = cmdline_parsefor_ipv46(argc, argv, &ipv6enabled);
+    const int argvoffset = cmdline_parsefor_ipv46(argc, argv, &ipv6enabled);
 
     if (argvoffset < 0) {
         return 1;

other/bootstrap_daemon/src/config.c

@@ -44,7 +44,7 @@ static void parse_tcp_relay_ports_config(config_t *cfg, uint16_t **tcp_relay_por
         log_write(LOG_LEVEL_WARNING, "No '%s' setting in the configuration file.\n", NAME_TCP_RELAY_PORTS);
         log_write(LOG_LEVEL_WARNING, "Using default '%s':\n", NAME_TCP_RELAY_PORTS);
 
-        uint16_t default_ports[] = {DEFAULT_TCP_RELAY_PORTS};
+        const uint16_t default_ports[] = {DEFAULT_TCP_RELAY_PORTS};
 
         // Check to avoid calling malloc(0) later on
         // NOLINTNEXTLINE, clang-tidy: error: suspicious comparison of 'sizeof(expr)' to a constant [bugprone-sizeof-expression,-warnings-as-errors]
@@ -90,7 +90,7 @@ static void parse_tcp_relay_ports_config(config_t *cfg, uint16_t **tcp_relay_por
         return;
     }
 
-    int config_port_count = config_setting_length(ports_array);
+    const int config_port_count = config_setting_length(ports_array);
 
     if (config_port_count == 0) {
         log_write(LOG_LEVEL_ERROR, "'%s' is empty.\n", NAME_TCP_RELAY_PORTS);
@@ -247,8 +247,8 @@ int get_general_config(const char *cfg_file_path, char **pid_file_path, char **k
             tmp_motd = DEFAULT_MOTD;
         }
 
-        size_t tmp_motd_length = strlen(tmp_motd) + 1;
-        size_t motd_length = tmp_motd_length > MAX_MOTD_LENGTH ? MAX_MOTD_LENGTH : tmp_motd_length;
+        const size_t tmp_motd_length = strlen(tmp_motd) + 1;
+        const size_t motd_length = tmp_motd_length > MAX_MOTD_LENGTH ? MAX_MOTD_LENGTH : tmp_motd_length;
         *motd = (char *)malloc(motd_length);
         snprintf(*motd, motd_length, "%s", tmp_motd);
     }
@@ -302,7 +302,7 @@ static uint8_t *bootstrap_hex_string_to_bin(const char *hex_string)
         return nullptr;
     }
 
-    size_t len = strlen(hex_string) / 2;
+    const size_t len = strlen(hex_string) / 2;
     uint8_t *ret = (uint8_t *)malloc(len);
 
     const char *pos = hex_string;

other/bootstrap_daemon/src/log_backend_syslog.c

@@ -51,7 +51,7 @@ void log_backend_syslog_write(LOG_LEVEL level, const char *format, va_list args)
     va_list args2;
 
     va_copy(args2, args);
-    int size = vsnprintf(nullptr, 0, format, args2);
+    const int size = vsnprintf(nullptr, 0, format, args2);
     va_end(args2);
 
     assert(size >= 0);

other/bootstrap_node_packets.c

@@ -35,7 +35,7 @@ static int handle_info_request(void *object, const IP_Port *source, const uint8_
     uint8_t data[1 + sizeof(bootstrap_version) + MAX_MOTD_LENGTH];
     data[0] = BOOTSTRAP_INFO_PACKET_ID;
     memcpy(data + 1, &bootstrap_version, sizeof(bootstrap_version));
-    uint16_t len = 1 + sizeof(bootstrap_version) + bootstrap_motd_length;
+    const uint16_t len = 1 + sizeof(bootstrap_version) + bootstrap_motd_length;
     memcpy(data + 1 + sizeof(bootstrap_version), bootstrap_motd, bootstrap_motd_length);
 
     if (sendpacket(nc, source, data, len) == len) {

toxcore/DHT.c

@@ -1163,7 +1163,7 @@ static bool ping_node_from_getnodes_ok(DHT *dht, const uint8_t *public_key, cons
  */
 uint32_t addto_lists(DHT *dht, const IP_Port *ip_port, const uint8_t *public_key)
 {
-    IP_Port ipp_copy = ip_port_normalize(ip_port);
+    const IP_Port ipp_copy = ip_port_normalize(ip_port);
 
     uint32_t used = 0;
 
@@ -1249,7 +1249,7 @@ static bool update_client_data(const Mono_Time *mono_time, Client_data *array, s
 non_null()
 static void returnedip_ports(DHT *dht, const IP_Port *ip_port, const uint8_t *public_key, const uint8_t *nodepublic_key)
 {
-    IP_Port ipp_copy = ip_port_normalize(ip_port);
+    const IP_Port ipp_copy = ip_port_normalize(ip_port);
 
     if (pk_equal(public_key, dht->self_public_key)) {
         update_client_data(dht->mono_time, dht->close_clientlist, LCLIENT_LIST, &ipp_copy, nodepublic_key, true);
@@ -2293,7 +2293,7 @@ static void punch_holes(DHT *dht, const IP *ip, const uint16_t *port_list, uint1
 
         uint16_t i;
         for (i = 0; i < MAX_PUNCHING_PORTS; ++i) {
-            uint32_t it = i + dht->friends_list[friend_num].nat.punching_index2;
+            const uint32_t it = i + dht->friends_list[friend_num].nat.punching_index2;
             const uint16_t port = 1024;
             pinging.port = net_htons(port + it);
             ping_send_request(dht->ping, &pinging, dht->friends_list[friend_num].public_key);

toxcore/Messenger.c

@@ -139,16 +139,16 @@ void getaddress(const Messenger *m, uint8_t *address)
 non_null()
 static bool send_online_packet(Messenger *m, int friendcon_id)
 {
-    uint8_t packet = PACKET_ID_ONLINE;
-    return write_cryptpacket(m->net_crypto, friend_connection_crypt_connection_id(m->fr_c, friendcon_id), &packet,
+    const uint8_t packet[1] = {PACKET_ID_ONLINE};
+    return write_cryptpacket(m->net_crypto, friend_connection_crypt_connection_id(m->fr_c, friendcon_id), packet,
                              sizeof(packet), false) != -1;
 }
 
 non_null()
 static bool send_offline_packet(Messenger *m, int friendcon_id)
 {
-    uint8_t packet = PACKET_ID_OFFLINE;
-    return write_cryptpacket(m->net_crypto, friend_connection_crypt_connection_id(m->fr_c, friendcon_id), &packet,
+    const uint8_t packet[1] = {PACKET_ID_OFFLINE};
+    return write_cryptpacket(m->net_crypto, friend_connection_crypt_connection_id(m->fr_c, friendcon_id), packet,
                              sizeof(packet), false) != -1;
 }
 

toxcore/TCP_client.c

@@ -285,7 +285,7 @@ static int proxy_socks5_read_connection_response(const Logger *logger, const TCP
     } else {
         uint8_t data[4 + sizeof(IP6) + sizeof(uint16_t)];
         const TCP_Connection *con = &tcp_conn->con;
-        int ret = read_tcp_packet(logger, con->mem, con->ns, con->sock, data, sizeof(data), &con->ip_port);
+        const int ret = read_tcp_packet(logger, con->mem, con->ns, con->sock, data, sizeof(data), &con->ip_port);
 
         if (ret == -1) {
             return 0;
@@ -952,7 +952,7 @@ void do_tcp_connection(const Logger *logger, const Mono_Time *mono_time,
 
     if (tcp_connection->status == TCP_CLIENT_PROXY_SOCKS5_CONNECTING) {
         if (send_pending_data(logger, &tcp_connection->con) == 0) {
-            int ret = socks5_read_handshake_response(logger, tcp_connection);
+            const int ret = socks5_read_handshake_response(logger, tcp_connection);
 
             if (ret == -1) {
                 tcp_connection->kill_at = 0;
@@ -968,7 +968,7 @@ void do_tcp_connection(const Logger *logger, const Mono_Time *mono_time,
 
     if (tcp_connection->status == TCP_CLIENT_PROXY_SOCKS5_UNCONFIRMED) {
         if (send_pending_data(logger, &tcp_connection->con) == 0) {
-            int ret = proxy_socks5_read_connection_response(logger, tcp_connection);
+            const int ret = proxy_socks5_read_connection_response(logger, tcp_connection);
 
             if (ret == -1) {
                 tcp_connection->kill_at = 0;

toxcore/TCP_connection.c

@@ -769,7 +769,7 @@ int set_tcp_connection_to_status(const TCP_Connections *tcp_c, int connections_n
 
     for (uint32_t i = 0; i < MAX_FRIEND_TCP_CONNECTIONS; ++i) {
         if (con_to->connections[i].tcp_connection > 0) {
-            unsigned int tcp_connections_number = con_to->connections[i].tcp_connection - 1;
+            const unsigned int tcp_connections_number = con_to->connections[i].tcp_connection - 1;
             TCP_con *tcp_con = get_tcp_connection(tcp_c, tcp_connections_number);
 
             if (tcp_con == nullptr) {
@@ -928,7 +928,7 @@ static int reconnect_tcp_relay_connection(TCP_Connections *tcp_c, int tcp_connec
         return -1;
     }
 
-    IP_Port ip_port = tcp_con_ip_port(tcp_con->connection);
+    const IP_Port ip_port = tcp_con_ip_port(tcp_con->connection);
     uint8_t relay_pk[CRYPTO_PUBLIC_KEY_SIZE];
     memcpy(relay_pk, tcp_con_public_key(tcp_con->connection), CRYPTO_PUBLIC_KEY_SIZE);
     kill_tcp_connection(tcp_con->connection);

toxcore/TCP_server.c

@@ -357,7 +357,7 @@ static int handle_tcp_handshake(const Logger *logger, TCP_Secure_Connection *con
         return -1;
     }
 
-    IP_Port ipp = {{{0}}};
+    const IP_Port ipp = {{{0}}};
 
     if (TCP_SERVER_HANDSHAKE_SIZE != net_send(con->con.ns, logger, con->con.sock, response, TCP_SERVER_HANDSHAKE_SIZE, &ipp)) {
         crypto_memzero(shared_key, sizeof(shared_key));
@@ -765,7 +765,7 @@ static int handle_tcp_packet(TCP_Server *tcp_server, uint32_t con_id, const uint
                     return -1;
                 }
 
-                IP_Port source = con_id_to_ip_port(con_id, con->identifier);
+                const IP_Port source = con_id_to_ip_port(con_id, con->identifier);
                 onion_send_1(tcp_server->onion, data + 1 + CRYPTO_NONCE_SIZE, length - (1 + CRYPTO_NONCE_SIZE), &source,
                              data + 1);
             }

toxcore/group.c

@@ -489,7 +489,7 @@ static bool add_to_closest(Group_c *g, const uint8_t *real_pk, const uint8_t *te
         comp_val = calculate_comp_value(real_pk, g->real_pk);
 
         for (unsigned int i = DESIRED_CLOSEST / 2; i < DESIRED_CLOSEST; ++i) {
-            uint64_t comp = calculate_comp_value(g->closest_peers[i].real_pk, g->real_pk);
+            const uint64_t comp = calculate_comp_value(g->closest_peers[i].real_pk, g->real_pk);
 
             if (comp > comp_val && comp > comp_d) {
                 index = i;

toxcore/group_chats.c

@@ -2978,7 +2978,7 @@ static int handle_gc_shared_state(const GC_Session *c, GC_Chat *chat, GC_Connect
         return 0;
     }
 
-    GC_SharedState old_shared_state = chat->shared_state;
+    const GC_SharedState old_shared_state = chat->shared_state;
     GC_SharedState new_shared_state;
 
     if (unpack_gc_shared_state(&new_shared_state, ss_data, ss_length) == 0) {

toxcore/net_crypto.c

@@ -695,7 +695,7 @@ static int send_packet_to(Net_Crypto *c, int crypt_connection_id, const uint8_t
     bool direct_send_attempt = false;
 
     pthread_mutex_lock(conn->mutex);
-    IP_Port ip_port = return_ip_port_connection(c, crypt_connection_id);
+    const IP_Port ip_port = return_ip_port_connection(c, crypt_connection_id);
 
     // TODO(irungentoo): on bad networks, direct connections might not last indefinitely.
     if (!net_family_is_unspec(ip_port.ip.family)) {
@@ -1508,9 +1508,9 @@ static int send_kill_packet(Net_Crypto *c, int crypt_connection_id)
         return -1;
     }
 
-    uint8_t kill_packet = PACKET_ID_KILL;
+    const uint8_t kill_packet[1] = {PACKET_ID_KILL};
     return send_data_packet_helper(c, crypt_connection_id, conn->recv_array.buffer_start, conn->send_array.buffer_end,
-                                   &kill_packet, sizeof(kill_packet));
+                                   kill_packet, sizeof(kill_packet));
 }
 
 non_null(1) nullable(3)
@@ -1677,7 +1677,7 @@ static int handle_data_packet_core(Net_Crypto *c, int crypt_connection_id, const
     }
 
     if (rtt_calc_time != 0) {
-        uint64_t rtt_time = current_time_monotonic(c->mono_time) - rtt_calc_time;
+        const uint64_t rtt_time = current_time_monotonic(c->mono_time) - rtt_calc_time;
 
         if (rtt_time < conn->rtt_time) {
             conn->rtt_time = rtt_time;
@@ -2817,8 +2817,8 @@ static void send_crypto_packets(Net_Crypto *c)
                                        1000.0);
                     n_packets += conn->last_packets_left_requested_rem;
 
-                    uint32_t num_packets = n_packets;
-                    double rem = n_packets - (double)num_packets;
+                    const uint32_t num_packets = n_packets;
+                    const double rem = n_packets - (double)num_packets;
                     conn->packets_left_requested = num_packets;
 
                     conn->last_packets_left_requested_set = temp_time;

toxcore/network.c

@@ -1270,7 +1270,7 @@ Networking_Core *new_networking_ex(
 
         const int res = net_setsockopt(ns, temp->sock, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq, sizeof(mreq));
 
-        int neterror = net_error();
+        const int neterror = net_error();
         char *strerror = net_new_strerror(neterror);
 
         if (res < 0) {
@@ -1336,7 +1336,7 @@ Networking_Core *new_networking_ex(
     }
 
     Ip_Ntoa ip_str;
-    int neterror = net_error();
+    const int neterror = net_error();
     char *strerror = net_new_strerror(neterror);
     LOGGER_ERROR(log, "failed to bind socket: %d, %s IP: %s port_from: %u port_to: %u",
                  neterror, strerror, net_ip_ntoa(ip, &ip_str), port_from, port_to);