Is this C18 base switch case?

Question

I was going through the latest code in the Linux kernel, when I found a switch written differently.

kernel/drivers/net/ethernet/intel/e1000/e1000_main.c Line number 3524

As per my C knowledge, switch/case needs to be written as

case e1000_undefined: // enum value as 0
case e1000_82542_rev2_0: // enum value as 1
case e1000_82542_rev2_1: // enum value as 2
         // code

But in kernel code I found it like this:

case e1000_undefined ... e1000_82542_rev2_1:
         // code

Is this C18 coding style for C?

Can someone point me a resource (book/GNU man pages) to understand more about C18?

other duplicates: [what does this syntax of switch case mean in C?](https://stackoverflow.com/q/17699746/995714), [Are triple dots inside a case (case '0' … '9':) valid C language switch syntax?](https://stackoverflow.com/q/7043788/995714), [Are Elipses in case statements standard C/C++](https://stackoverflow.com/q/5924681/995714), [Choosing enum element using “…” (duplicate)](https://stackoverflow.com/q/37318196/995714) — phuclv, Jan 22 '20 at 07:20
The "c18" tag is for "MPLAB C Compiler for PIC18 MCUs" , is that what you are asking about? (Not to be confused with ISO/IEC 9899:2018) — M.M, Jan 22 '20 at 07:26

score 4 · Accepted Answer · answered Jan 22 '20 at 07:01

4

answered Jan 22 '20 at 07:01

the busybee

Thanks, then what is C18 ? where can I get to know more ? I want to understand difference between C18 and old C (C98/C99) – Rohit Jan 23 '20 at 05:33
You may start with [C's wikipedia page](https://en.wikipedia.org/wiki/C_(programming_language)). – the busybee Jan 23 '20 at 06:41
@Rohit These will also help: https://en.cppreference.com/w/c (see tiny links: " C89, C95, C99, C11, C17, C23") and https://en.cppreference.com/w/c/language/history – kevinarpe Oct 26 '22 at 14:20

1 Answers1