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In spite of having read K&R, and having even taught C classes, I find myself embarrassingly unable to fully understand what one might call "modern" C. There seems to be many unwritten conventions in modern programming that, as far as I know, aren't documented anywhere. Take, for example, the SQLite source code. In it I find for instance: SQLITE_API int sqlite3_close(sqlite3 *); What does SQLITE_API stand for? How is this even syntactically correct? Or this: #ifndef _SQLITE3_H_ #define _SQLITE3_H_ Is there an accepted convention somewhere on when to prefix macros with underscores? Sometimes I see macros prefixed with two underscores. Or what about the use of fixed-size types, such as uint32 and so forth. When should one use this practice, and when not? What about the new-ish bool type, when should it be preferred over simple ints? These are some of the questions I pose myself when I read other people's source code. Is there a reference somewhere that might help me answer these questions?

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