Use nullptr as NULL pointer constant instead of NULL or 0.

This changes only code, no string literals or comments.

6 files changed, 31 insertions, 29 deletions

diff --git a/other/DHT_bootstrap.c b/other/DHT_bootstrap.c
index 33ca45c2..bbb4844e 100644
--- a/other/DHT_bootstrap.c
+++ b/other/DHT_bootstrap.c
@@ -60,7 +60,7 @@ static void manage_keys(DHT *dht)
 
     FILE *keys_file = fopen("key", "r");
 
-    if (keys_file != NULL) {
+    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);
@@ -78,7 +78,7 @@ static void manage_keys(DHT *dht)
         memcpy(keys + CRYPTO_PUBLIC_KEY_SIZE, dht_get_self_secret_key(dht), CRYPTO_SECRET_KEY_SIZE);
         keys_file = fopen("key", "w");
 
-        if (keys_file == NULL) {
+        if (keys_file == nullptr) {
             printf("Error opening key file in write mode.\nKeys will not be saved.\n");
             return;
         }
@@ -115,7 +115,7 @@ int main(int argc, char *argv[])
     IP ip;
     ip_init(&ip, ipv6enabled);
 
-    DHT *dht = new_DHT(NULL, new_networking(NULL, ip, PORT), true);
+    DHT *dht = new_DHT(nullptr, new_networking(nullptr, ip, PORT), true);
     Onion *onion = new_onion(dht);
     Onion_Announce *onion_a = new_onion_announce(dht);
 
@@ -139,7 +139,7 @@ int main(int argc, char *argv[])
     uint16_t ports[NUM_PORTS] = {443, 3389, PORT};
     TCP_Server *tcp_s = new_TCP_server(ipv6enabled, NUM_PORTS, ports, dht_get_self_secret_key(dht), onion);
 
-    if (tcp_s == NULL) {
+    if (tcp_s == nullptr) {
         printf("TCP server failed to initialize.\n");
         exit(1);
     }
@@ -149,7 +149,7 @@ int main(int argc, char *argv[])
     const char *const public_id_filename = "PUBLIC_ID.txt";
     FILE *file = fopen(public_id_filename, "w");
 
-    if (file == NULL) {
+    if (file == nullptr) {
         printf("Could not open file \"%s\" for writing. Exiting...\n", public_id_filename);
         exit(1);
     }
@@ -200,7 +200,7 @@ int main(int argc, char *argv[])
 #ifdef TCP_RELAY_ENABLED
         do_TCP_server(tcp_s);
 #endif
-        networking_poll(dht_get_net(dht), NULL);
+        networking_poll(dht_get_net(dht), nullptr);
 
         c_sleep(1);
     }
diff --git a/other/bootstrap_daemon/src/command_line_arguments.c b/other/bootstrap_daemon/src/command_line_arguments.c
index dce828a7..d9747932 100644
--- a/other/bootstrap_daemon/src/command_line_arguments.c
+++ b/other/bootstrap_daemon/src/command_line_arguments.c
@@ -26,6 +26,8 @@
 
 #include "global.h"
 
+#include "../../../toxcore/ccompat.h"
+
 #include <getopt.h>
 
 #include <stdlib.h>
@@ -87,7 +89,7 @@ void handle_command_line_arguments(int argc, char *argv[], char **cfg_file_path,
 
     int opt;
 
-    while ((opt = getopt_long(argc, argv, ":", long_options, NULL)) != -1) {
+    while ((opt = getopt_long(argc, argv, ":", long_options, nullptr)) != -1) {
 
         switch (opt) {
 
diff --git a/other/bootstrap_daemon/src/config.c b/other/bootstrap_daemon/src/config.c
index 64fc4d94..3f1592e6 100644
--- a/other/bootstrap_daemon/src/config.c
+++ b/other/bootstrap_daemon/src/config.c
@@ -49,7 +49,7 @@ static void parse_tcp_relay_ports_config(config_t *cfg, uint16_t **tcp_relay_por
 
     config_setting_t *ports_array = config_lookup(cfg, NAME_TCP_RELAY_PORTS);
 
-    if (ports_array == NULL) {
+    if (ports_array == nullptr) {
         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);
 
@@ -83,7 +83,7 @@ static void parse_tcp_relay_ports_config(config_t *cfg, uint16_t **tcp_relay_por
             *tcp_relay_ports = (uint16_t *)realloc(*tcp_relay_ports, (*tcp_relay_port_count) * sizeof(uint16_t));
         } else {
             free(*tcp_relay_ports);
-            *tcp_relay_ports = NULL;
+            *tcp_relay_ports = nullptr;
         }
 
         return;
@@ -109,7 +109,7 @@ static void parse_tcp_relay_ports_config(config_t *cfg, uint16_t **tcp_relay_por
     for (i = 0; i < config_port_count; i ++) {
         config_setting_t *elem = config_setting_get_elem(ports_array, i);
 
-        if (elem == NULL) {
+        if (elem == nullptr) {
             // it's NULL if `ports_array` is not an array (we have that check earlier) or if `i` is out of range, which should not be
             log_write(LOG_LEVEL_WARNING, "Port #%d: Something went wrong while parsing the port. Stopping reading ports.\n", i);
             break;
@@ -137,7 +137,7 @@ static void parse_tcp_relay_ports_config(config_t *cfg, uint16_t **tcp_relay_por
         *tcp_relay_ports = (uint16_t *)realloc(*tcp_relay_ports, (*tcp_relay_port_count) * sizeof(uint16_t));
     } else {
         free(*tcp_relay_ports);
-        *tcp_relay_ports = NULL;
+        *tcp_relay_ports = nullptr;
     }
 }
 
@@ -306,7 +306,7 @@ int get_general_config(const char *cfg_file_path, char **pid_file_path, char **k
 static uint8_t *hex_string_to_bin(const char *hex_string)
 {
     if (strlen(hex_string) % 2 != 0) {
-        return NULL;
+        return nullptr;
     }
 
     size_t len = strlen(hex_string) / 2;
@@ -342,7 +342,7 @@ int bootstrap_from_config(const char *cfg_file_path, DHT *dht, int enable_ipv6)
 
     config_setting_t *node_list = config_lookup(&cfg, NAME_BOOTSTRAP_NODES);
 
-    if (node_list == NULL) {
+    if (node_list == nullptr) {
         log_write(LOG_LEVEL_WARNING, "No '%s' setting in the configuration file. Skipping bootstrapping.\n",
                   NAME_BOOTSTRAP_NODES);
         config_destroy(&cfg);
@@ -369,7 +369,7 @@ int bootstrap_from_config(const char *cfg_file_path, DHT *dht, int enable_ipv6)
 
         node = config_setting_get_elem(node_list, 0);
 
-        if (node == NULL) {
+        if (node == nullptr) {
             config_destroy(&cfg);
             return 0;
         }
diff --git a/other/bootstrap_daemon/src/log_backend_syslog.c b/other/bootstrap_daemon/src/log_backend_syslog.c
index 88911a21..9fc6d18f 100644
--- a/other/bootstrap_daemon/src/log_backend_syslog.c
+++ b/other/bootstrap_daemon/src/log_backend_syslog.c
@@ -63,7 +63,7 @@ void log_backend_syslog_write(LOG_LEVEL level, const char *format, va_list args)
     va_list args2;
 
     va_copy(args2, args);
-    int size = vsnprintf(NULL, 0, format, args2);
+    int size = vsnprintf(nullptr, 0, format, args2);
     va_end(args2);
 
     assert(size >= 0);
diff --git a/other/bootstrap_daemon/src/tox-bootstrapd.c b/other/bootstrap_daemon/src/tox-bootstrapd.c
index e0472cba..bdf679c9 100644
--- a/other/bootstrap_daemon/src/tox-bootstrapd.c
+++ b/other/bootstrap_daemon/src/tox-bootstrapd.c
@@ -65,7 +65,7 @@ static int manage_keys(DHT *dht, char *keys_file_path)
     // Check if file exits, proceed to open and load keys
     keys_file = fopen(keys_file_path, "r");
 
-    if (keys_file != NULL) {
+    if (keys_file != nullptr) {
         const size_t read_size = fread(keys, sizeof(uint8_t), KEYS_SIZE, keys_file);
 
         if (read_size != KEYS_SIZE) {
@@ -131,7 +131,7 @@ static void daemonize(LOG_BACKEND log_backend, char *pid_file_path)
     // Open the PID file for writing
     pid_file = fopen(pid_file_path, "a+");
 
-    if (pid_file == NULL) {
+    if (pid_file == nullptr) {
         log_write(LOG_LEVEL_ERROR, "Couldn't open the PID file for writing: %s. Exiting.\n", pid_file_path);
         exit(1);
     }
@@ -226,16 +226,16 @@ int main(int argc, char *argv[])
     IP ip;
     ip_init(&ip, enable_ipv6);
 
-    Networking_Core *net = new_networking(NULL, ip, port);
+    Networking_Core *net = new_networking(nullptr, ip, port);
 
-    if (net == NULL) {
+    if (net == nullptr) {
         if (enable_ipv6 && enable_ipv4_fallback) {
             log_write(LOG_LEVEL_WARNING, "Couldn't initialize IPv6 networking. Falling back to using IPv4.\n");
             enable_ipv6 = 0;
             ip_init(&ip, enable_ipv6);
-            net = new_networking(NULL, ip, port);
+            net = new_networking(nullptr, ip, port);
 
-            if (net == NULL) {
+            if (net == nullptr) {
                 log_write(LOG_LEVEL_ERROR, "Couldn't fallback to IPv4. Exiting.\n");
                 return 1;
             }
@@ -245,9 +245,9 @@ int main(int argc, char *argv[])
         }
     }
 
-    DHT *dht = new_DHT(NULL, net, true);
+    DHT *dht = new_DHT(nullptr, net, true);
 
-    if (dht == NULL) {
+    if (dht == nullptr) {
         log_write(LOG_LEVEL_ERROR, "Couldn't initialize Tox DHT instance. Exiting.\n");
         return 1;
     }
@@ -280,7 +280,7 @@ int main(int argc, char *argv[])
 
     free(keys_file_path);
 
-    TCP_Server *tcp_server = NULL;
+    TCP_Server *tcp_server = nullptr;
 
     if (enable_tcp_relay) {
         if (tcp_relay_port_count == 0) {
@@ -293,7 +293,7 @@ int main(int argc, char *argv[])
         // tcp_relay_port_count != 0 at this point
         free(tcp_relay_ports);
 
-        if (tcp_server != NULL) {
+        if (tcp_server != nullptr) {
             log_write(LOG_LEVEL_INFO, "Initialized Tox TCP server successfully.\n");
         } else {
             log_write(LOG_LEVEL_ERROR, "Couldn't initialize Tox TCP server. Exiting.\n");
@@ -332,7 +332,7 @@ int main(int argc, char *argv[])
             do_TCP_server(tcp_server);
         }
 
-        networking_poll(dht_get_net(dht), NULL);
+        networking_poll(dht_get_net(dht), nullptr);
 
         if (waiting_for_dht_connection && DHT_isconnected(dht)) {
             log_write(LOG_LEVEL_INFO, "Connected to another bootstrap node successfully.\n");
diff --git a/other/fun/sign.c b/other/fun/sign.c
index 0cd8f38e..b24cdae7 100644
--- a/other/fun/sign.c
+++ b/other/fun/sign.c
@@ -24,8 +24,8 @@ int load_file(char *filename, char **result)
     int size = 0;
     FILE *f = fopen(filename, "rb");
 
-    if (f == NULL) {
-        *result = NULL;
+    if (f == nullptr) {
+        *result = nullptr;
         return -1; // -1 means file opening fail
     }
 
@@ -88,7 +88,7 @@ int main(int argc, char *argv[])
 
         FILE *f = fopen(argv[4], "wb");
 
-        if (f == NULL) {
+        if (f == nullptr) {
             goto fail;
         }