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[libc] Move VA_ARG_COUNT() macro to stdarg.h 

Make the non-standard but extremely useful macro VA_ARG_COUNT()
available outside of dhcp.h.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/6/head
Michael Brown 2012-03-16 11:57:15 +00:00
parent 0e81ff2297
commit a0082b1308
2 changed files with 27 additions and 26 deletions
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27
src/include/ipxe/dhcp.h
View File

@ -10,6 +10,7 @@
FILE_LICENCE ( GPL2_OR_LATER );
#include <stdint.h>
#include <stdarg.h>
#include <ipxe/in.h>
#include <ipxe/list.h>
#include <ipxe/refcnt.h>
@ -458,32 +459,6 @@ struct dhcp_netdev_desc {
/** @} */
/**
* Count number of arguments to a variadic macro
*
* This rather neat, non-iterative solution is courtesy of Laurent
* Deniau.
*
*/
#define _VA_ARG_COUNT( _1, _2, _3, _4, _5, _6, _7, _8, \
_9, _10, _11, _12, _13, _14, _15, _16, \
_17, _18, _19, _20, _21, _22, _23, _24, \
_25, _26, _27, _28, _29, _30, _31, _32, \
_33, _34, _35, _36, _37, _38, _39, _40, \
_41, _42, _43, _44, _45, _46, _47, _48, \
_49, _50, _51, _52, _53, _54, _55, _56, \
_57, _58, _59, _60, _61, _62, _63, N, ... ) N
#define VA_ARG_COUNT( ... ) \
_VA_ARG_COUNT ( __VA_ARGS__, \
63, 62, 61, 60, 59, 58, 57, 56, \
55, 54, 53, 52, 51, 50, 49, 48, \
47, 46, 45, 44, 43, 42, 41, 40, \
39, 38, 37, 36, 35, 34, 33, 32, \
31, 30, 29, 28, 27, 26, 25, 24, \
23, 22, 21, 20, 19, 18, 17, 16, \
15, 14, 13, 12, 11, 10, 9, 8, \
7, 6, 5, 4, 3, 2, 1, 0 )
/** Construct a DHCP option from a list of bytes */
#define DHCP_OPTION( ... ) VA_ARG_COUNT ( __VA_ARGS__ ), __VA_ARGS__

26
src/include/stdarg.h
View File

@ -9,4 +9,30 @@ typedef __builtin_va_list va_list;
#define va_end( ap ) __builtin_va_end ( ap )
#define va_copy( dest, src ) __builtin_va_copy ( dest, src )
/**
* Count number of arguments to a variadic macro
*
* This rather neat, non-iterative solution is courtesy of Laurent
* Deniau.
*
*/
#define _VA_ARG_COUNT( _1, _2, _3, _4, _5, _6, _7, _8, \
_9, _10, _11, _12, _13, _14, _15, _16, \
_17, _18, _19, _20, _21, _22, _23, _24, \
_25, _26, _27, _28, _29, _30, _31, _32, \
_33, _34, _35, _36, _37, _38, _39, _40, \
_41, _42, _43, _44, _45, _46, _47, _48, \
_49, _50, _51, _52, _53, _54, _55, _56, \
_57, _58, _59, _60, _61, _62, _63, N, ... ) N
#define VA_ARG_COUNT( ... ) \
_VA_ARG_COUNT ( __VA_ARGS__, \
63, 62, 61, 60, 59, 58, 57, 56, \
55, 54, 53, 52, 51, 50, 49, 48, \
47, 46, 45, 44, 43, 42, 41, 40, \
39, 38, 37, 36, 35, 34, 33, 32, \
31, 30, 29, 28, 27, 26, 25, 24, \
23, 22, 21, 20, 19, 18, 17, 16, \
15, 14, 13, 12, 11, 10, 9, 8, \
7, 6, 5, 4, 3, 2, 1, 0 )
#endif /* _STDARG_H */