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Standard library header <stdarg.h>

From cppreference.net
C
Standard Library headers

This header provides support for varying arguments .

Types
holds the information needed by va_start , va_arg , va_end , and va_copy
(typedef)
Macros
enables access to variadic function arguments
(function macro)
accesses the next variadic function argument
(function macro)
(C99)
makes a copy of the variadic function arguments
(function macro)
ends traversal of the variadic function arguments
(function macro)

Synopsis 

#define __STDC_VERSION_STDARG_H__ 202311L
typedef /*unspecified*/ va_list;
/*type*/ va_arg(va_list ap, /*type*/);
void va_copy(va_list dest, va_list src);
void va_end(va_list ap);
void va_start(va_list ap, ...);