In this post, I was write as we can get the parameters given to a function in language C, using stdarg library, that declares a type va_list and defines three macros for stepping through a list of arguments whose number and types are not known to the called function.
Below is show the declared functions in stdarg:
#include <stdarg.h>
void va_start( va_list ap, last );
type va_arg( va_list ap, type );
void va_end( va_list ap );
void va_copy( va_list dest, va_list src );
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As shown above, we can see that use the function va_start, which is declared in stdarg.h header. This function is responsible to get a varying number of arguments of varying types.
The var_start macro, initializes va_list for subsequent use by va_arg() and va_end(), and must be called first.