What is “…” in switch-case in C code

Question

Here is a piece of code in /usr/src/linux-3.10.10-1-ARCH/include/linux/printk.h:

static inline int printk_get_level(const char *buffer)
{
  if (         


        

Answer 1

Beware, it is not standard C and therefore not portable. It is a shorthand devised for case statements. It's well-defined since in C you can only switch on integral types.

In standard C, ... is only used in variable length argument lists.