confile_utils: add lxc_get_conf_uint64()

src/lxc/confile_utils.c

@@ -672,6 +672,16 @@ int lxc_get_conf_int(struct lxc_conf *c, char *retv, int inlen, int v)
 	return snprintf(retv, inlen, "%d", v);
 }
 
+int lxc_get_conf_uint64(struct lxc_conf *c, char *retv, int inlen, uint64_t v)
+{
+	if (!retv)
+		inlen = 0;
+	else
+		memset(retv, 0, inlen);
+
+	return snprintf(retv, inlen, "%"PRIu64, v);
+}
+
 bool parse_limit_value(const char **value, rlim_t *res)
 {
 	char *endptr = NULL;

src/lxc/confile_utils.h

@@ -84,5 +84,7 @@ extern void update_hwaddr(const char *line);
 extern bool new_hwaddr(char *hwaddr);
 extern int lxc_get_conf_str(char *retv, int inlen, const char *value);
 extern int lxc_get_conf_int(struct lxc_conf *c, char *retv, int inlen, int v);
+extern int lxc_get_conf_uint64(struct lxc_conf *c, char *retv, int inlen, uint64_t v);
 extern bool parse_limit_value(const char **value, rlim_t *res);
+
 #endif /* __LXC_CONFILE_UTILS_H */