va_list

C

Language

Headers

Type support

Program utilities

Variadic function support

Error handling

Dynamic memory management

Date and time utilities

Strings library

Algorithms

Numerics

Input/output support

Localization support

Atomic operations (C11)

Thread support (C11)

Technical Specifications

Variadic functions

va_start

va_arg

va_copy

va_end

va_list

/* unspecified */ va_list;

va_list is a complete object type suitable for holding the information needed by the macros va_start, va_copy, va_arg, and va_end.

If a va_list instance is created, passed to another function, and used via va_arg in that function, then any subsequent use in the calling function should be preceded by a call to va_end.

It is legal to pass a pointer to a va_list object to another function and then use that object after the function returns.

References

• C11 standard (ISO/IEC 9899:2011):

• 7.16/3 Variable arguments <stdarg.h> (p: 269)

• C99 standard (ISO/IEC 9899:1999):

• 7.15/3 Variable arguments <stdarg.h> (p: 249)

• C89/C90 standard (ISO/IEC 9899:1990):

• 4.8 VARIABLE ARGUMENTS <stdarg.h>

See also

va_arg	accesses the next variadic function argument (function macro)
va_copy (C99)	makes a copy of the variadic function arguments (function macro)
va_end	ends traversal of the variadic function arguments (function macro)
va_start	enables access to variadic function arguments (function macro)