gisi: Explicit compare to NULL

8 files changed, 116 insertions, 97 deletions

diff --git a/gisi/client.c b/gisi/client.c
index e536d4e3..267bfc5e 100644
--- a/gisi/client.c
+++ b/gisi/client.c
@@ -49,10 +49,10 @@ static void pending_destroy(gpointer data)
 {
 	struct pending_data *pd = data;
 
-	if (!pd)
+	if (pd == NULL)
 		return;
 
-	if (pd->destroy)
+	if (pd->destroy != NULL)
 		pd->destroy(pd->data);
 
 	g_free(pd);
@@ -62,10 +62,10 @@ static void pending_resp_notify(const GIsiMessage *msg, void *data)
 {
 	struct pending_data *pd = data;
 
-	if (!pd)
+	if (pd == NULL)
 		return;
 
-	if (pd->notify)
+	if (pd->notify != NULL)
 		pd->notify(msg, pd->data);
 
 	pd->client->pending = g_slist_remove(pd->client->pending,
@@ -76,34 +76,34 @@ static void pending_notify(const GIsiMessage *msg, void *data)
 {
 	struct pending_data *pd = data;
 
-	if (!pd)
+	if (pd == NULL)
 		return;
 
-	if (pd->notify)
+	if (pd->notify != NULL)
 		pd->notify(msg, pd->data);
 }
 
 uint8_t g_isi_client_resource(GIsiClient *client)
 {
-	return client ? client->resource : 0;
+	return client != NULL ? client->resource : 0;
 }
 
 GIsiModem *g_isi_client_modem(GIsiClient *client)
 {
-	return client ? client->modem : NULL;
+	return client != NULL ? client->modem : NULL;
 }
 
 GIsiClient *g_isi_client_create(GIsiModem *modem, uint8_t resource)
 {
 	GIsiClient *client;
 
-	if (!modem) {
+	if (modem == NULL) {
 		errno = EINVAL;
 		return NULL;
 	}
 
 	client  = g_try_new0(GIsiClient, 1);
-	if (!client) {
+	if (client == NULL) {
 		errno = ENOMEM;
 		return NULL;
 	}
@@ -120,7 +120,7 @@ static void foreach_destroy(gpointer value, gpointer user)
 	GIsiPending *op = value;
 	GIsiClient *client = user;
 
-	if (!op || !client)
+	if (op == NULL || client == NULL)
 		return;
 
 	client->pending = g_slist_remove(client->pending, op);
@@ -129,10 +129,7 @@ static void foreach_destroy(gpointer value, gpointer user)
 
 void g_isi_client_reset(GIsiClient *client)
 {
-	if (client == NULL)
-		return;
-
-	if (!client->pending)
+	if (client == NULL || client->pending == NULL)
 		return;
 
 	g_slist_foreach(client->pending, foreach_destroy, client);
@@ -142,7 +139,7 @@ void g_isi_client_reset(GIsiClient *client)
 
 void g_isi_client_destroy(GIsiClient *client)
 {
-	if (!client)
+	if (client == NULL)
 		return;
 
 	g_isi_client_reset(client);
@@ -162,7 +159,7 @@ static struct pending_data *pending_data_create(GIsiClient *client,
 	}
 
 	pd = g_try_new0(struct pending_data, 1);
-	if (!pd) {
+	if (pd == NULL) {
 		errno = ENOMEM;
 		return NULL;
 	}
@@ -184,12 +181,12 @@ GIsiPending *g_isi_client_send(GIsiClient *client, const void *__restrict buf,
 	GIsiPending *op;
 
 	pd = pending_data_create(client, notify, data, destroy);
-	if (!pd)
+	if (pd == NULL)
 		return NULL;
 
 	op = g_isi_request_send(client->modem, client->resource, buf, len, timeout,
 				pending_resp_notify, pd, pending_destroy);
-	if (!op) {
+	if (op == NULL) {
 		g_free(pd);
 		return NULL;
 	}
@@ -208,13 +205,13 @@ GIsiPending *g_isi_client_vsend(GIsiClient *client,
 	GIsiPending *op;
 
 	pd = pending_data_create(client, notify, data, destroy);
-	if (!pd)
+	if (pd == NULL)
 		return NULL;
 
 	op = g_isi_request_vsend(client->modem, client->resource, iov, iovlen,
 					timeout, pending_resp_notify, pd,
 					pending_destroy);
-	if (!op) {
+	if (op == NULL) {
 		g_free(pd);
 		return NULL;
 	}
@@ -230,12 +227,12 @@ GIsiPending *g_isi_client_ind_subscribe(GIsiClient *client, uint8_t type,
 	GIsiPending *op;
 
 	pd = pending_data_create(client, notify, data, NULL);
-	if (!pd)
+	if (pd == NULL)
 		return NULL;
 
 	op = g_isi_ind_subscribe(client->modem, client->resource, type,
 					pending_notify, pd, pending_destroy);
-	if (!op) {
+	if (op == NULL) {
 		g_free(pd);
 		return NULL;
 	}
@@ -251,12 +248,12 @@ GIsiPending *g_isi_client_ntf_subscribe(GIsiClient *client, uint8_t type,
 	GIsiPending *op;
 
 	pd = pending_data_create(client, notify, data, NULL);
-	if (!pd)
+	if (pd == NULL)
 		return NULL;
 
 	op = g_isi_ntf_subscribe(client->modem, client->resource, type,
 					pending_notify, pd, pending_destroy);
-	if (!op) {
+	if (op == NULL) {
 		g_free(pd);
 		return NULL;
 	}
@@ -272,13 +269,13 @@ GIsiPending *g_isi_client_verify(GIsiClient *client, GIsiNotifyFunc notify,
 	GIsiPending *op;
 
 	pd = pending_data_create(client, notify, data, destroy);
-	if (!pd)
+	if (pd == NULL)
 		return NULL;
 
 	op = g_isi_resource_ping(client->modem, client->resource,
 					pending_resp_notify, pd,
 					pending_destroy);
-	if (!op) {
+	if (op == NULL) {
 		g_free(pd);
 		return NULL;
 	}
diff --git a/gisi/iter.c b/gisi/iter.c
index 53e4c3b3..d9c111fd 100644
--- a/gisi/iter.c
+++ b/gisi/iter.c
@@ -52,7 +52,7 @@ void g_isi_sb_iter_init_full(GIsiSubBlockIter *iter, const GIsiMessage *msg,
 	const uint8_t *data = g_isi_msg_data(msg);
 	size_t len = g_isi_msg_data_len(msg);
 
-	if (!data)
+	if (data == NULL)
 		len = used = 0;
 
 	iter->start = (uint8_t *)data + used;
@@ -67,7 +67,7 @@ void g_isi_sb_iter_init(GIsiSubBlockIter *iter, const GIsiMessage *msg,
 	const uint8_t *data = g_isi_msg_data(msg);
 	size_t len = g_isi_msg_data_len(msg);
 
-	if (!data)
+	if (data == NULL)
 		len = used = 0;
 
 	iter->start = (uint8_t *)data + used;
@@ -204,7 +204,7 @@ gboolean g_isi_sb_iter_get_alpha_tag(const GIsiSubBlockIter *restrict iter,
 	if (pos > g_isi_sb_iter_get_len(iter))
 		return FALSE;
 
-	if (!utf8 || len == 0 || pos + len > g_isi_sb_iter_get_len(iter))
+	if (utf8 == NULL || len == 0 || pos + len > g_isi_sb_iter_get_len(iter))
 		return FALSE;
 
 	ucs2 = iter->start + pos;
@@ -224,7 +224,7 @@ gboolean g_isi_sb_iter_get_latin_tag(const GIsiSubBlockIter *restrict iter,
 	if (pos > g_isi_sb_iter_get_len(iter))
 		return FALSE;
 
-	if (!latin || len == 0 || pos + len > g_isi_sb_iter_get_len(iter))
+	if (latin == NULL || len == 0 || pos + len > g_isi_sb_iter_get_len(iter))
 		return FALSE;
 
 	str = iter->start + pos;
diff --git a/gisi/message.c b/gisi/message.c
index 01f3a277..8f4fe5a7 100644
--- a/gisi/message.c
+++ b/gisi/message.c
@@ -33,17 +33,23 @@
 
 int g_isi_msg_version_major(const GIsiMessage *msg)
 {
-	return msg && msg->version ? msg->version->major : -1;
+	if (msg == NULL || msg->version == NULL)
+		return -1;
+
+	return msg->version->major;
 }
 
 int g_isi_msg_version_minor(const GIsiMessage *msg)
 {
-	return msg && msg->version ? msg->version->minor : -1;
+	if (msg == NULL || msg->version == NULL)
+		return -1;
+
+	return msg->version->minor;
 }
 
 int g_isi_msg_error(const GIsiMessage *msg)
 {
-	return msg ? -msg->error : -EINVAL;
+	return msg != NULL ? -msg->error : -EINVAL;
 }
 
 const char *g_isi_msg_strerror(const GIsiMessage *msg)
@@ -53,19 +59,25 @@ const char *g_isi_msg_strerror(const GIsiMessage *msg)
 
 uint8_t g_isi_msg_resource(const GIsiMessage *msg)
 {
-	return msg && msg->addr ? msg->addr->spn_resource : 0;
+	if (msg == NULL || msg->addr == NULL)
+		return 0;
+
+	return msg->addr->spn_resource;
 }
 
 uint16_t g_isi_msg_object(const GIsiMessage *msg)
 {
-	return msg && msg->addr ? (msg->addr->spn_dev << 8) | msg->addr->spn_obj : 0;
+	if (msg == NULL || msg->addr == NULL)
+		return 0;
+
+	return (msg->addr->spn_dev << 8) | msg->addr->spn_obj;
 }
 
 uint8_t g_isi_msg_id(const GIsiMessage *msg)
 {
 	const uint8_t *buf;
 
-	if (!msg || !msg->data || msg->len < 2)
+	if (msg == NULL || msg->data == NULL || msg->len < 2)
 		return 0;
 
 	buf = msg->data;
@@ -77,7 +89,7 @@ uint8_t g_isi_msg_utid(const GIsiMessage *msg)
 {
 	const uint8_t *buf;
 
-	if (!msg || !msg->data || msg->len < 2)
+	if (msg == NULL || msg->data == NULL || msg->len < 2)
 		return 0;
 
 	buf = msg->data;
@@ -87,12 +99,18 @@ uint8_t g_isi_msg_utid(const GIsiMessage *msg)
 
 size_t g_isi_msg_data_len(const GIsiMessage *msg)
 {
-	return msg && msg->data ? msg->len - 2 : 0;
+	if (msg == NULL || msg->data == NULL)
+		return 0;
+
+	return msg->len - 2;
 }
 
 const void *g_isi_msg_data(const GIsiMessage *msg)
 {
-	return msg && msg->data ? (void *)msg->data + 2 : NULL;
+	if (msg == NULL || msg->data == NULL)
+		return NULL;
+
+	return (void *)msg->data + 2;
 }
 
 gboolean g_isi_msg_data_get_byte(const GIsiMessage *msg, unsigned offset,
@@ -100,10 +118,10 @@ gboolean g_isi_msg_data_get_byte(const GIsiMessage *msg, unsigned offset,
 {
 	const uint8_t *buf = g_isi_msg_data(msg);
 
-	if (!buf || g_isi_msg_data_len(msg) < offset)
+	if (buf == NULL || g_isi_msg_data_len(msg) < offset)
 		return FALSE;
 
-	if (byte)
+	if (byte != NULL)
 		*byte = buf[offset];
 
 	return TRUE;
@@ -115,11 +133,12 @@ gboolean g_isi_msg_data_get_word(const GIsiMessage *msg, unsigned offset,
 	const uint8_t *buf = g_isi_msg_data(msg);
 	uint16_t val;
 
-	if (!buf || g_isi_msg_data_len(msg) < offset + 1)
+	if (buf == NULL || g_isi_msg_data_len(msg) < offset + 1)
 		return FALSE;
 
 	memcpy(&val, buf + offset, sizeof(uint16_t));
-	if (word)
+
+	if (word != NULL)
 		*word = ntohs(val);
 
 	return TRUE;
@@ -131,7 +150,7 @@ gboolean g_isi_msg_data_get_struct(const GIsiMessage *msg, unsigned offset,
 	if (g_isi_msg_data_len(msg) < offset + len)
 		return FALSE;
 
-	if (type)
+	if (type != NULL)
 		*type = g_isi_msg_data(msg) + offset;
 
 	return TRUE;
diff --git a/gisi/modem.c b/gisi/modem.c
index 473ca295..d3e15a4b 100644
--- a/gisi/modem.c
+++ b/gisi/modem.c
@@ -93,11 +93,11 @@ static GIsiServiceMux *service_get(GIsiModem *modem, uint8_t resource)
 	int key = resource;
 
 	mux = g_hash_table_lookup(modem->services, GINT_TO_POINTER(key));
-	if (mux)
+	if (mux != NULL)
 		return mux;
 
 	mux = g_try_new0(GIsiServiceMux, 1);
-	if (!mux)
+	if (mux == NULL)
 		return NULL;
 
 	g_hash_table_insert(modem->services, GINT_TO_POINTER(key), mux);
@@ -136,7 +136,7 @@ static void service_dispatch(GIsiServiceMux *mux, GIsiMessage *msg,
 
 	GSList *l = mux->pending;
 
-	while (l) {
+	while (l != NULL) {
 		GSList *next = l->next;
 		GIsiPending *pend = l->data;
 		msg->private = pend;
@@ -348,13 +348,13 @@ static void pending_destroy(gpointer value, gpointer user)
 {
 	GIsiPending *op = value;
 
-	if (!op)
+	if (op == NULL)
 		return;
 
 	if (op->timeout > 0)
 		g_source_remove(op->timeout);
 
-	if (op->destroy)
+	if (op->destroy != NULL)
 		op->destroy(op->data);
 
 	g_free(op);
@@ -388,7 +388,7 @@ GIsiModem *g_isi_modem_create(unsigned index)
 	}
 
 	modem = g_try_new0(GIsiModem, 1);
-	if (!modem) {
+	if (modem == NULL) {
 		errno = ENOMEM;
 		return NULL;
 	}
@@ -396,7 +396,7 @@ GIsiModem *g_isi_modem_create(unsigned index)
 	inds = g_isi_phonet_new(index);
 	reqs = g_isi_phonet_new(index);
 
-	if (!inds || !reqs) {
+	if (inds == NULL || reqs == NULL) {
 		g_free(modem);
 		return NULL;
 	}
@@ -490,7 +490,7 @@ static void service_regs_decr(GIsiServiceMux *mux)
 
 void g_isi_modem_destroy(GIsiModem *modem)
 {
-	if (!modem)
+	if (modem == NULL)
 		return;
 
 	g_hash_table_remove_all(modem->services);
@@ -502,10 +502,10 @@ void g_isi_modem_destroy(GIsiModem *modem)
 
 	g_hash_table_unref(modem->services);
 
-	if (modem->ind_watch)
+	if (modem->ind_watch > 0)
 		g_source_remove(modem->ind_watch);
 
-	if (modem->req_watch)
+	if (modem->req_watch > 0)
 		g_source_remove(modem->req_watch);
 
 	g_free(modem);
@@ -513,7 +513,7 @@ void g_isi_modem_destroy(GIsiModem *modem)
 
 unsigned g_isi_modem_index(GIsiModem *modem)
 {
-	return modem ? modem->index : 0;
+	return modem != NULL ? modem->index : 0;
 }
 
 GIsiPending *g_isi_request_send(GIsiModem *modem, uint8_t resource,
@@ -617,19 +617,19 @@ GIsiPending *g_isi_request_vsendto(GIsiModem *modem, struct sockaddr_pn *dst,
 	GIsiServiceMux *mux;
 	GIsiPending *resp;
 
-	if (!modem) {
+	if (modem == NULL) {
 		errno = EINVAL;
 		return NULL;
 	}
 
 	mux = service_get(modem, dst->spn_resource);
-	if (!mux) {
+	if (mux == NULL) {
 		errno = ENOMEM;
 		return NULL;
 	}
 
 	resp = g_try_new0(GIsiPending, 1);
-	if (!resp) {
+	if (resp == NULL) {
 		errno = ENOMEM;
 		return NULL;
 	}
@@ -675,7 +675,7 @@ GIsiPending *g_isi_request_vsendto(GIsiModem *modem, struct sockaddr_pn *dst,
 
 	mux->pending = g_slist_prepend(mux->pending, resp);
 
-	if (timeout)
+	if (timeout > 0)
 		resp->timeout = g_timeout_add_seconds(timeout, resp_timeout, resp);
 
 	mux->last_utid = resp->utid;
@@ -688,17 +688,17 @@ error:
 
 uint8_t g_isi_request_utid(GIsiPending *resp)
 {
-	return resp ? resp->utid : 0;
+	return resp != NULL ? resp->utid : 0;
 }
 
 GIsiPending *g_isi_pending_from_msg(const GIsiMessage *msg)
 {
-	return msg ? msg->private : NULL;
+	return msg != NULL ? msg->private : NULL;
 }
 
 void g_isi_pending_remove(GIsiPending *op)
 {
-	if (!op)
+	if (op == NULL)
 		return;
 
 	op->service->pending = g_slist_remove(op->service->pending, op);
@@ -709,7 +709,7 @@ void g_isi_pending_remove(GIsiPending *op)
 	if (op->type == GISI_MESSAGE_TYPE_REQ)
 		service_regs_decr(op->service);
 
-	if (op->type == GISI_MESSAGE_TYPE_RESP && op->notify) {
+	if (op->type == GISI_MESSAGE_TYPE_RESP && op->notify != NULL) {
 		GIsiMessage msg = {
 			.error = ESHUTDOWN,
 			.private = op,
@@ -729,13 +729,13 @@ GIsiPending *g_isi_ntf_subscribe(GIsiModem *modem, uint8_t resource,
 	GIsiPending *ntf;
 
 	mux = service_get(modem, resource);
-	if (!mux) {
+	if (mux == NULL) {
 		errno = ENOMEM;
 		return NULL;
 	}
 
 	ntf = g_try_new0(GIsiPending, 1);
-	if (!ntf) {
+	if (ntf == NULL) {
 		errno = ENOMEM;
 		return NULL;
 	}
@@ -760,13 +760,13 @@ GIsiPending *g_isi_service_bind(GIsiModem *modem, uint8_t resource,
 	GIsiPending *srv;
 
 	mux = service_get(modem, resource);
-	if (!mux) {
+	if (mux == NULL) {
 		errno = ENOMEM;
 		return NULL;
 	}
 
 	srv = g_try_new0(GIsiPending, 1);
-	if (!srv) {
+	if (srv == NULL) {
 		errno = ENOMEM;
 		return NULL;
 	}
@@ -793,13 +793,13 @@ GIsiPending *g_isi_ind_subscribe(GIsiModem *modem, uint8_t resource,
 	GIsiPending *ind;
 
 	mux = service_get(modem, resource);
-	if (!mux) {
+	if (mux == NULL) {
 		errno = ENOMEM;
 		return NULL;
 	}
 
 	ind = g_try_new0(GIsiPending, 1);
-	if (!ind) {
+	if (ind == NULL) {
 		errno = ENOMEM;
 		return NULL;
 	}
@@ -876,11 +876,11 @@ int g_isi_modem_vsendto(GIsiModem *modem, struct sockaddr_pn *dst,
 	size_t i, len;
 	GIsiServiceMux *mux;
 
-	if (!modem)
+	if (modem == NULL)
 		return -EINVAL;
 
 	mux = service_get(modem, dst->spn_resource);
-	if (!mux)
+	if (mux == NULL)
 		return -ENOMEM;
 
 	for (i = 0, len = 0; i < iovlen; i++)
@@ -972,13 +972,13 @@ GIsiPending *g_isi_resource_ping(GIsiModem *modem, uint8_t resource,
 	int ret;
 
 	mux = service_get(modem, resource);
-	if (!mux) {
+	if (mux == NULL) {
 		errno = ENOMEM;
 		return NULL;
 	}
 
 	ping = g_try_new0(GIsiPending, 1);
-	if (!ping) {
+	if (ping == NULL) {
 		errno = ENOMEM;
 		return NULL;
 	}
diff --git a/gisi/netlink.c b/gisi/netlink.c
index ed95af6a..07cd6f49 100644
--- a/gisi/netlink.c
+++ b/gisi/netlink.c
@@ -336,7 +336,7 @@ error:
 
 void g_isi_pn_netlink_stop(GIsiPhonetNetlink *self)
 {
-	if (!self)
+	if (self == NULL)
 		return;
 
 	netlink_list = g_slist_remove(netlink_list, self);
diff --git a/gisi/pep.c b/gisi/pep.c
index bea19024..c82dc39c 100644
--- a/gisi/pep.c
+++ b/gisi/pep.c
@@ -65,7 +65,7 @@ static gboolean g_isi_pep_callback(GIOChannel *channel, GIOCondition cond,
 	}
 	pep->gprs_fd = fd;
 
-	if (pep->ready)
+	if (pep->ready != NULL)
 		pep->ready(pep, pep->opaque);
 
 	return FALSE;
diff --git a/gisi/pipe.c b/gisi/pipe.c
index 84ceb16c..31be675f 100644
--- a/gisi/pipe.c
+++ b/gisi/pipe.c
@@ -171,7 +171,8 @@ static void g_isi_pipe_handle_error(GIsiPipe *pipe, uint8_t code)
 
 static void g_isi_pipe_created(const GIsiMessage *msg, void *data)
 {
-	const struct isi_pipe_resp *resp = g_isi_msg_data(msg);
+	struct isi_pipe_resp *resp;
+	size_t len = sizeof(struct isi_pipe_resp);
 	GIsiPipe *pipe = data;
 
 	if (g_isi_msg_error(msg) < 0) {
@@ -182,7 +183,7 @@ static void g_isi_pipe_created(const GIsiMessage *msg, void *data)
 	if (g_isi_msg_id(msg) != PNS_PIPE_CREATE_RESP)
 		 return;
 
-	if (!resp || g_isi_msg_data_len(msg) != sizeof(struct isi_pipe_resp))
+	if (!g_isi_msg_data_get_struct(msg, 0, (const void **) &resp, len))
 		return;
 
 	if (resp->pipe_handle == PN_PIPE_INVALID_HANDLE) {
@@ -259,7 +260,8 @@ GIsiPipe *g_isi_pipe_create(GIsiModem *modem, GIsiPipeHandler cb, uint16_t obj1,
 static void g_isi_pipe_enabled(const GIsiMessage *msg, void *data)
 {
 	GIsiPipe *pipe = data;
-	const struct isi_pipe_resp *resp = g_isi_msg_data(msg);
+	const struct isi_pipe_resp *resp;
+	size_t len = sizeof(struct isi_pipe_resp);
 
 	if (g_isi_msg_error(msg) < 0) {
 		g_isi_pipe_handle_error(pipe, PN_PIPE_ERR_TIMEOUT);
@@ -269,7 +271,7 @@ static void g_isi_pipe_enabled(const GIsiMessage *msg, void *data)
 	if (g_isi_msg_id(msg) != PNS_PIPE_ENABLE_RESP)
 		return;
 
-	if (!resp || g_isi_msg_data_len(msg) != sizeof(struct isi_pipe_resp))
+	if (!g_isi_msg_data_get_struct(msg, 0, (const void **) &resp, len))
 		return;
 
 	if (pipe->handle != resp->pipe_handle)
@@ -320,7 +322,8 @@ int g_isi_pipe_start(GIsiPipe *pipe)
 static void g_isi_pipe_removed(const GIsiMessage *msg, void *data)
 {
 	GIsiPipe *pipe = data;
-	const struct isi_pipe_resp *resp = g_isi_msg_data(msg);
+	struct isi_pipe_resp *resp;
+	size_t len = sizeof(struct isi_pipe_resp);
 
 	if (g_isi_msg_error(msg) < 0) {
 		g_isi_pipe_handle_error(pipe, PN_PIPE_ERR_TIMEOUT);
@@ -330,7 +333,7 @@ static void g_isi_pipe_removed(const GIsiMessage *msg, void *data)
 	if (g_isi_msg_id(msg) != PNS_PIPE_REMOVE_RESP)
 		return;
 
-	if (!resp || g_isi_msg_data_len(msg) != sizeof(struct isi_pipe_resp))
+	if (!g_isi_msg_data_get_struct(msg, 0, (const void **) &resp, len))
 		return;
 
 	if (pipe->handle != resp->pipe_handle)
diff --git a/gisi/server.c b/gisi/server.c
index 45c523d8..e6cc9a5b 100644
--- a/gisi/server.c
+++ b/gisi/server.c
@@ -49,21 +49,21 @@ static void pending_notify(const GIsiMessage *msg, void *data)
 {
 	struct pending_data *pd = data;
 
-	if (!pd)
+	if (pd == NULL)
 		return;
 
-	if (pd->notify)
+	if (pd->notify != NULL)
 		pd->notify(msg, pd->data);
 }
 
 uint8_t g_isi_server_resource(GIsiServer *server)
 {
-	return server ? server->resource : 0;
+	return server != NULL ? server->resource : 0;
 }
 
 GIsiModem *g_isi_server_modem(GIsiServer *server)
 {
-	return server ? server->modem : 0;
+	return server != NULL ? server->modem : 0;
 }
 
 GIsiServer *g_isi_server_create(GIsiModem *modem, uint8_t resource,
@@ -71,18 +71,18 @@ GIsiServer *g_isi_server_create(GIsiModem *modem, uint8_t resource,
 {
 	GIsiServer *server;
 
-	if (!modem) {
+	if (modem == NULL) {
 		errno = EINVAL;
 		return NULL;
 	}
 
 	server  = g_try_new0(GIsiServer, 1);
-	if (!server) {
+	if (server == NULL) {
 		errno = ENOMEM;
 		return NULL;
 	}
 
-	if (version)
+	if (version != NULL)
 		memcpy(&server->version, version, sizeof(GIsiVersion));
 
 	server->resource = resource;
@@ -97,7 +97,7 @@ static void foreach_destroy(gpointer value, gpointer user)
 	GIsiPending *op = value;
 	GIsiServer *server = user;
 
-	if (!op || !server)
+	if (op == NULL || server == NULL)
 		return;
 
 	server->pending = g_slist_remove(server->pending, op);
@@ -106,7 +106,7 @@ static void foreach_destroy(gpointer value, gpointer user)
 
 void g_isi_server_destroy(GIsiServer *server)
 {
-	if (!server)
+	if (server == NULL)
 		return;
 
 	g_slist_foreach(server->pending, foreach_destroy, server);
@@ -117,7 +117,7 @@ void g_isi_server_destroy(GIsiServer *server)
 int g_isi_server_send(GIsiServer *server, const GIsiMessage *req,
 			const void *__restrict buf, size_t len)
 {
-	if (!server)
+	if (server == NULL)
 		return -EINVAL;
 
 	return g_isi_response_send(server->modem, req, buf, len);
@@ -126,7 +126,7 @@ int g_isi_server_send(GIsiServer *server, const GIsiMessage *req,
 int g_isi_server_vsend(GIsiServer *server, const GIsiMessage *req,
 			const struct iovec *iov, size_t iovlen)
 {
-	if (!server)
+	if (server == NULL)
 		return -EINVAL;
 
 	return g_isi_response_vsend(server->modem, req, iov, iovlen);
@@ -138,13 +138,13 @@ static struct pending_data *pending_data_create(GIsiServer *server,
 {
 	struct pending_data *pd;
 
-	if (!server) {
+	if (server == NULL) {
 		errno = EINVAL;
 		return NULL;
 	}
 
 	pd = g_try_new0(struct pending_data, 1);
-	if (!pd) {
+	if (pd == NULL) {
 		errno = ENOMEM;
 		return NULL;
 	}
@@ -163,12 +163,12 @@ GIsiPending *g_isi_server_handle(GIsiServer *server, uint8_t type,
 	GIsiPending *op;
 
 	pd = pending_data_create(server, notify, data);
-	if (!pd)
+	if (pd == NULL)
 		return NULL;
 
 	op = g_isi_service_bind(server->modem, server->resource, type,
 				pending_notify, pd, g_free);
-	if (!op) {
+	if (op == NULL) {
 		g_free(pd);
 		return NULL;
 	}