diff --git a/src/connection.c b/src/connection.c
index 54caa4b..fdbab10 100644
--- a/src/connection.c
+++ b/src/connection.c
@@ -212,6 +212,16 @@ static int _write_socket_SSL(connection_t *cn, char* message)
 
 	size = sizeof(char)*strlen(message);
 
+	// let's not ERR (SSL_write doesn't allow 0 len writes)
+	if (size == 0)
+		return WRITE_OK;
+
+	// this will fail anyways
+	if (size > INT_MAX) {
+		mylog(LOG_ERROR, "Message too long in SSL write_socket");
+		return WRITE_ERROR;
+	}
+
 	if (!cn->client && cn->cert == NULL) {
 		cn->cert = mySSL_get_cert(cn->ssl_h);
 		if (cn->cert == NULL) {
@@ -219,7 +229,7 @@ static int _write_socket_SSL(connection_t *cn, char* message)
 			return WRITE_ERROR;
 		}
 	}
-	count = SSL_write(cn->ssl_h, (const void *)message, size);
+	count = SSL_write(cn->ssl_h, (const void *)message, (int)size);
 	ERR_print_errors(errbio);
 	if (count <= 0) {
 		int err = SSL_get_error(cn->ssl_h, count);
@@ -234,10 +244,10 @@ static int _write_socket_SSL(connection_t *cn, char* message)
 		}
 		return WRITE_ERROR;
 	}
-	if (count != size) {
+	if (count != (int)size) {
 		/* abnormal : openssl keeps writing until message is not fully
 		 * sent */
-		mylog(LOG_DEBUG, "only %d written while message length is %d",
+		mylog(LOG_ERROR, "SSL_write wrote only %d while message length is %d",
 				count,size);
 	}
 
@@ -474,9 +484,23 @@ list_t *read_lines(connection_t *cn, int *error)
 /* returns 1 if connection must be notified */
 static int read_socket_SSL(connection_t *cn)
 {
-	int max, count;
+	int count;
+	size_t max;
+
+	if (cn == NULL)
+		return 0;
+
+	if (cn->incoming_end >= CONN_BUFFER_SIZE) {
+		mylog(LOG_ERROR, "read_socket_SSL: internal error");
+		return -1;
+	}
+
+	max = sizeof(char)*(CONN_BUFFER_SIZE - cn->incoming_end);
+	if (max > INT_MAX) {
+		mylog(LOG_ERROR, "read_socket_SSL: cannot read that much data");
+		return -1;
+	}
 
-	max = CONN_BUFFER_SIZE - cn->incoming_end;
 	if (!cn->client && cn->cert == NULL) {
 		cn->cert = mySSL_get_cert(cn->ssl_h);
 		if (cn->cert == NULL) {
@@ -484,8 +508,8 @@ static int read_socket_SSL(connection_t *cn)
 			return -1;
 		}
 	}
-	count = SSL_read(cn->ssl_h, (void *)cn->incoming + cn->incoming_end,
-			sizeof(char) * max);
+	count = SSL_read(cn->ssl_h, (void *)(cn->incoming + cn->incoming_end),
+			(int)max);
 	ERR_print_errors(errbio);
 	if (count < 0) {
 		int err = SSL_get_error(cn->ssl_h, count);
@@ -511,23 +535,29 @@ static int read_socket_SSL(connection_t *cn)
 			connection_close(cn);
 		}
 		return 1;
+	} else {
+		cn->incoming_end += (size_t)count;
+		return 0;
 	}
-
-	cn->incoming_end += count;
-	return 0;
 }
 #endif
 
 /* returns 1 if connection must be notified */
 static int read_socket(connection_t *cn)
 {
-	int max, count;
+	ssize_t count;
+	size_t max;
 
 	if (cn == NULL)
 		return 0;
-	max = CONN_BUFFER_SIZE - cn->incoming_end;
-	count = read(cn->handle, cn->incoming+cn->incoming_end,
-			sizeof(char)*max);
+
+	if (cn->incoming_end >= CONN_BUFFER_SIZE) {
+		mylog(LOG_ERROR, "read_socket: internal error");
+		return -1;
+	}
+
+	max = sizeof(char)*(CONN_BUFFER_SIZE - cn->incoming_end);
+	count = read(cn->handle, cn->incoming+cn->incoming_end, max);
 	if (count < 0) {
 		if (errno == EAGAIN || errno == EINTR || errno == EINPROGRESS)
 			return 0;
@@ -544,10 +574,10 @@ static int read_socket(connection_t *cn)
 			connection_close(cn);
 		}
 		return 1;
+	} else {
+		cn->incoming_end += (unsigned)count;
+		return 0;
 	}
-
-	cn->incoming_end += count;
-	return 0;
 }
 
 static void data_find_lines(connection_t *cn)
diff --git a/src/connection.h b/src/connection.h
index 5109936..b5f78a1 100644
--- a/src/connection.h
+++ b/src/connection.h
@@ -75,7 +75,7 @@ typedef struct connection {
 	time_t connect_time;
 	time_t timeout;
 	char *incoming;
-	unsigned incoming_end;
+	size_t incoming_end;
 	list_t *outgoing;
 	char *partial;
 	list_t *incoming_lines;
diff --git a/src/irc.c b/src/irc.c
index 4762751..d431178 100644
--- a/src/irc.c
+++ b/src/irc.c
@@ -1294,7 +1294,9 @@ static void irc_copy_cli(struct link_client *src, struct link_client *dest,
 	}
 
 	/* LINK(src) == LINK(dest) */
-	size_t len = strlen(irc_line_elem(line, 2)) + 5;
+	size_t len = strlen(irc_line_elem(line, 2)) + 6;
+	// snprintf fix                               ^
+	// ‘__builtin___snprintf_chk’ output may be truncated before the last format character
 	char *tmp;
 
 	if (len == 0)
@@ -2897,10 +2899,13 @@ static void server_set_prefix(struct link_server *s, const char *modes)
 static int bip_get_index(const char* str, char car)
 {
 	char *cur;
-	if ((cur = strchr(str, car)))
-		return cur - str + 1;
-	else
+	long diff;
+	if (!(cur = strchr(str, car)))
 		return 0;
+	diff = cur - str + 1;
+	if (diff > INT_MAX)
+		fatal("bip_get_index: string too long");
+	return (int)diff;
 }
 
 static int bip_fls(long v)
diff --git a/src/log.c b/src/log.c
index 6aea268..b32018e 100644
--- a/src/log.c
+++ b/src/log.c
@@ -1116,13 +1116,21 @@ static list_t *log_backread(log_t *log, const char *storename, const char *dest)
 static char *_log_wrap(const char *dest, const char *line)
 {
 	char *buf;
-	size_t count;
+	int count;
 
 	buf = bip_malloc((size_t)LOGLINE_MAXLEN + 1);
 	count = snprintf(buf, (size_t)LOGLINE_MAXLEN + 1,
 			":" P_IRCMASK " PRIVMSG %s :%s\r\n", dest, line);
+	if (count < 0) {
+		mylog(LOG_ERROR, "_log_wrap: error on snprintf: %s",
+				strerror(errno));
+		buf[LOGLINE_MAXLEN - 2] = '\r';
+		buf[LOGLINE_MAXLEN - 1] = '\n';
+		buf[LOGLINE_MAXLEN] = 0;
+		return buf;
+	}
 	if (count >= LOGLINE_MAXLEN + 1) {
-		mylog(LOG_DEBUG, "line too long");
+		mylog(LOG_WARN, "_log_wrap: line too long");
 		buf[LOGLINE_MAXLEN - 2] = '\r';
 		buf[LOGLINE_MAXLEN - 1] = '\n';
 		buf[LOGLINE_MAXLEN] = 0;
@@ -1172,13 +1180,16 @@ static size_t _log_write(log_t *logdata, logstore_t *store,
 void log_write(log_t *logdata, const char *destination, const char *str)
 {
 	logstore_t *store = log_find_file(logdata, destination);
+	size_t written;
 
 	if (!store) {
 		mylog(LOG_ERROR, "Unable to find/create logfile for '%s'",
 				destination);
 		return;
 	}
-	_log_write(logdata, store, destination, str);
+	written = _log_write(logdata, store, destination, str);
+	if (written <= 0)
+		mylog(LOG_WARN, "log_write to '%s' failed", destination);
 }
 
 static list_t *log_all_logs = NULL;