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| author | Michael Brown | 2012-03-16 12:57:15 +0100 |
|---|---|---|
| committer | Michael Brown | 2012-03-18 13:26:33 +0100 |
| commit | a0082b1308e009526c5b74aa1579f25c46969221 (patch) | |
| tree | b886325c00abdc9b7c910759d7c17361eab92aa7 /src/include/stdarg.h | |
| parent | [myri10ge] Fix compilation error in myri10ge_command() with gcc 4.7 (diff) | |
| download | ipxe-a0082b1308e009526c5b74aa1579f25c46969221.tar.gz ipxe-a0082b1308e009526c5b74aa1579f25c46969221.tar.xz ipxe-a0082b1308e009526c5b74aa1579f25c46969221.zip | |
[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>
Diffstat (limited to 'src/include/stdarg.h')
| -rw-r--r-- | src/include/stdarg.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/src/include/stdarg.h b/src/include/stdarg.h index 78b261ae..f317238a 100644 --- a/src/include/stdarg.h +++ b/src/include/stdarg.h @@ -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 */ |