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Currently the only way to check, whether the right message have been generated is to look into the generated text output. This is error-prone if there are many messages. This patch adds a way to optionally store all received messages into a FIFO. They can then be checked by calling expect_msg() which removes the first message from the FIFO and returns a pointer to it or NULL if there is none. The pointer is only valid until the next call to this function. A few convenience functions are added to check for common message types: - expect_gmm_msg checks for certain GSM 04.08 messages in LLC/GMM - expect_llc_msg checks for arbitrary LLC messages in BSSGP/UD - expect_bssgp_msg checks for arbitrary BSSG messages Each of their arguments can be set by MATCH_ANY to ignore it while matching. On success, they return a pointer to a statically allocated struct containing the pointer to the msg and the full parse context. Recording is enabled by setting the global variable received_messages to a pointer to a struct llist_head. It can be disabled again by setting it to NULL. Sponsored-by: On-Waves ehf
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