c - Passing too many arguments to printf

Question

Any C programmer who's been working for more than a week has encountered crashes that result from calling printf with more format specifiers than actual arguments, e.g.:

printf("Gonna %s and %s, %s!", "crash", "burn");

However, are there any similar bad things that can happen when you pass too many arguments to printf?

printf("Gonna %s and %s!", "crash", "burn", "dude");

My knowledge of x86/x64 assembly leads me to believe that this is harmless, though I'm not convinced that there's not some edge condition I'm missing, and I have no idea about other architectures. Is this condition guaranteed to be harmless, or is there a potentially crash-inducing pitfall here, too?

Answer 1

Online C Draft Standard (n1256), section 7.19.6.1, paragraph 2:

The fprintf function writes output to the stream pointed to by stream, under control of the string pointed to by format that specifies how subsequent arguments are converted for output. If there are insufficient arguments for the format, the behavior is undefined. If the format is exhausted while arguments remain, the excess arguments are evaluated (as always) but are otherwise ignored. The fprintf function returns when the end of the format string is encountered.

Behavior for all the other *printf() functions is the same wrt excess arguments except for vprintf() (obviously).