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A.2.2 How Variadic Functions are Defined and Used ¶

Defining and using a variadic function involves three steps:

• Define the function as variadic, using an ellipsis (‘…’) in the argument list, and using special macros to access the variable arguments. See Receiving the Argument Values.
• Declare the function as variadic, using a prototype with an ellipsis (‘…’), in all the files which call it. See Syntax for Variable Arguments.
• Call the function by writing the fixed arguments followed by the additional variable arguments. See Calling Variadic Functions.

• Syntax for Variable Arguments
• Receiving the Argument Values
• How Many Arguments Were Supplied
• Calling Variadic Functions
• Argument Access Macros