From a0c698c720441782fcf2cb7dfd01e69baf8f1f39 Mon Sep 17 00:00:00 2001 From: Dan Streetman Date: Thu, 2 Feb 2023 15:58:10 -0500 Subject: [PATCH] basic/macro: add macro to iterate variadic args (cherry picked from commit e179f2d89c9f0c951636d74de00136b4075cd1ac) (cherry picked from commit cd4f43bf378ff33ce5cfeacd96f7f3726603bddc) Upstream-Status: Backport [https://github.com/systemd/systemd-stable/commit/c288a3aafdf11cd93eb7a21e4d587c6fc218a29c] Signed-off-by: Chen Qi --- src/basic/macro.h | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/src/basic/macro.h b/src/basic/macro.h index 9e62f9c71c..16242902ec 100644 --- a/src/basic/macro.h +++ b/src/basic/macro.h @@ -454,4 +454,13 @@ typedef struct { assert_cc(sizeof(dummy_t) == 0); +/* Iterate through each variadic arg. All must be the same type as 'entry' or must be implicitly + * convertable. The iteration variable 'entry' must already be defined. */ +#define VA_ARGS_FOREACH(entry, ...) \ + _VA_ARGS_FOREACH(entry, UNIQ_T(_entries_, UNIQ), UNIQ_T(_current_, UNIQ), ##__VA_ARGS__) +#define _VA_ARGS_FOREACH(entry, _entries_, _current_, ...) \ + for (typeof(entry) _entries_[] = { __VA_ARGS__ }, *_current_ = _entries_; \ + ((long)(_current_ - _entries_) < (long)ELEMENTSOF(_entries_)) && ({ entry = *_current_; true; }); \ + _current_++) + #include "log.h" -- 2.34.1