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how does va_arg implement ?

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# 1  
Old 04-19-2003
how does va_arg implement ?
1 . How does va_arg implemented by system?
# 2  
Old 04-20-2003
Here's the man page for va_arg.
# 3  
Old 04-20-2003
How va_args is implemented varies widely. It cannot be written portably in C. It is often written in assembly language. And sometimes it get very special attention from the compiler itself.

There are several functions specified by the ansi c standard that cannot be written in C in a portable manner. setjmp() comes to mind very quickly. Also crt0.o or whatever is used to call main().

Or each system the language developer has to find a way to get this stuff to work. And it's harder on some systems than others.

The source code is available for some versions of unix. If you're really interested, you can download it and check it out. Click here for a thread that mentions some links. Or use a search engine. But remember, you will be looking at an example. There is no general solution.
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