Update MSG macro and create MSG_ONCE macro

[ATrivialAtomic]

Hi there!

Would it be possible to update the #define MSG macro in debug.h to add a space after "%s"? Without the space, you have to add a space at the head of your fmt message to provide separation between MOD_NAME and that message.

Also, more of a personal/syntax question -- should a "\n" be included at the tail of the fmt line ("%s " fmt "\n") to automatically append a newline without having to manually do it with each message? Would that be better served with a new macro that specifies a newline will be added?

Current MSG implementation:

#define MSG(l, fmt, ...) \
        log_msg(LOG_LEVEL_##l, "%s" fmt, MOD_NAME, ##__VA_ARGS__)

Proposed change:

#define MSG(l, fmt, ...) \
        log_msg(LOG_LEVEL_##l, "%s " fmt "\n", MOD_NAME, ##__VA_ARGS__)

---

Also, in keeping with moving towards preference for MSG, would it be possible to create a similar macro for log_msg_once?

Proposed MSG_ONCE implementation:

#define MSG_ONCE(l, id, fmt, ...) \
        log_msg_once(LOG_LEVEL_##l, id, "%s " fmt "\n", MOD_NAME, ##__VA_ARGS__)