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/** @file
This header, <stdarg.h>, declares type va_list and defines macros: va_start, va_arg, va_end;
for advancing through a list of arguments whose number and types are not known to the
called function when it is translated.
A function may be called with a variable number of arguments of varying types.
The rightmost argument plays a special role in the access mechanism, and will
be designated paramN in this and subsequent descriptions.
The type va_list is a type suitable for holding information needed by the
macros va_start, va_arg, and va_end. If access to the varying arguments
is desired, the called function shall declare an object (referred to as ap
in these descriptions) having type va_list. The object ap may be passed as
an argument to another function; if the receiving function invokes the va_arg macro
with parameter ap, the value of ap in the calling function becomes indeterminate
and must be passed to the va_end macro prior to any further reference to ap.
The va_start and va_arg macros must be implemented as macros, not as actual
functions. The va_start and va_end macros must be invoked in the
function accepting a varying number of arguments, if access to the varying
arguments is desired.
Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials are licensed and made available under
the terms and conditions of the BSD License that accompanies this distribution.
The full text of the license may be found at
http://opensource.org/licenses/bsd-license.
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#ifndef _STDARG_H
#define _STDARG_H
#include <sys/EfiCdefs.h>
/** @{
The type va_list is a type suitable for holding information needed by the
macros va_start, va_arg, and va_end.
Depending upon compiler or CPU architecture, different definitions are required.
**/
#if defined(__GNUC__)
typedef __builtin_va_list va_list;
#else
#define va_list VA_LIST
#endif
/*@}*/
/** @{
The va_start macro must be invoked before any access to the unnamed arguments.
The va_start macro initializes ap for subsequent use by va_arg and va_end.
Synopsys: void va_start(va_list ap, paramN);
@param ap An object of type va_list that is to be initialized such
that subsequent successive invocations of va_arg will
return the values of the parameters following paramN.
@param paramN The parameter paramN is the identifier of the rightmost
parameter in the variable parameter list in the function
definition (the one just before the ,...). If the
parameter parmN is declared with the register storage
class, with a function of array type, or with a type that
is not compatible with the type that results after
application of the default argument promotions, the
behavior is undefined.
**/
#if defined(__GNUC__)
#define va_start __builtin_va_start
#else
#define va_start VA_START
#endif
/*@}*/
/** @{
The va_arg macro expands to an expression that has the type and value of
the next argument in the call. The parameter ap shall be the same as the
va_list ap initialized by va_start. Each invocation of va_arg modifies ap
so that the values of successive arguments are returned in turn. The
parameter type is a type name specified such that the type of a pointer to
an object that has the specified type can be obtained simply by postfixing
a * to type. If there is no actual next argument, or if type is not
compatible with the type of the actual next argument (as promoted
according to the default argument promotions), the behavior is undefined.
Synopsys: type va_arg(va_list ap, type);
@param ap An object of type va_list that was initialized by a prior
invocation of va_start.
@param type A type name specifying the type of the parameter to be retrieved.
@return The first invocation of the va_arg macro after that of the
va_start macro returns the value of the argument after that
specified by paramN. Successive invocations return the values
of the remaining arguments in succession.
**/
#if defined(__GNUC__)
#define va_arg __builtin_va_arg
#else
#define va_arg VA_ARG
#endif
/*@}*/
/** @{
The va_end macro facillitates a normal return from the function whose
variable argument list was referred to by the expansion of va_start that
initialized the va_list ap.
Synopsys: void va_end(va_list ap);
The va_end macro may modify ap so that it is no longer usable (without an
intervening invocation of va_start). If there is no corresponding
invocation of the va_start macro, or if the va_end macro is not invoked
before the return, the behavior is undefined.
@param ap An object of type va_list, initialized by a prior
invocation of va_start, that will no longer be referenced.
**/
#if defined(__GNUC__)
#define va_end __builtin_va_end
#else
#define va_end VA_END
#endif
/*@}*/
/** @{
For BSD compatibility.
**/
#if defined(__GNUC__)
#define va_copy __builtin_va_copy
#else
#define va_copy(s,d) (s) = (d)
#endif
/*@}*/
#endif /* _STDARG_H */
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