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When dealing with variable argument lists in C, I was just curious to know which data structure might a compiler be using when storing the variable arguments in a list.
No structure. The calling code just puts the arguments on the stack, it’s the vararg function’s responsibity to decode them properly.
For example in case of printf, the first argument is fixed, a c string, and the rest is decoded based on what’s in the string. C just gives you tools to access these elements so you don’t have to do stack pointer arithmetic based on size of the fields (which is architecture dependent..)