cli: revamp option syntax

for device (-d) and format (-f), the syntax is:

  <thing>:key=value:key2=value2

diff --git a/sigrok.h b/sigrok.h
index e3b6ac78c56dbd5de0e27d626671ad9e3ce28fa6..4decd625afe6cd396da818488d8a94bfa9d2253e 100644 (file)
--- a/sigrok.h
+++ b/sigrok.h
@@ -78,6 +78,7 @@ typedef int (*receive_data_callback) (int fd, int revents, void *user_data);
 enum {
        T_UINT64,
        T_CHAR,
+       T_NULL,
 };
 
 enum {