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Initialize variable argument list

Synopsis
#include <varargs.h>
va_list ap;
va_start(ap);

Description
With the `varargs.h' macros, use va_start to initialize a data structure ap to permit manipulating a variable argument list. ap must have the type va_alist.

Returns
va_start does not return a result.

Portability
va_start is also defined as a macro in ANSI C, but the definitions are incompatible; the ANSI version has another parameter besides ap.


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