From: Willy Tarreau <w@1wt.eu>
Date: Tue, 19 Nov 2024 14:44:32 +0000 (+0100)
Subject: MINOR: tools: add new macro DEFZERO to provide a default zero argument
X-Git-Tag: v3.1-dev14~68
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=e57581d76d86329646c4ff788f98c8cb9c03981b;p=thirdparty%2Fhaproxy.git

MINOR: tools: add new macro DEFZERO to provide a default zero argument

This is the equivalent of DEFNULL except that it sets a zero value instead
of a NULL for a missing argument.
---

diff --git a/include/haproxy/tools-t.h b/include/haproxy/tools-t.h
index ad881ae8f0..34e2fd818f 100644
--- a/include/haproxy/tools-t.h
+++ b/include/haproxy/tools-t.h
@@ -51,6 +51,12 @@
  * use in macros arguments.
  */
 #define DEFNULL(...) _FIRST_ARG(NULL, ##__VA_ARGS__, NULL)
+
+/* DEFZERO() returns either the argument as-is, or 0 if absent. This is for
+ * use in macros arguments.
+ */
+#define DEFZERO(...) _FIRST_ARG(NULL, ##__VA_ARGS__, 0)
+
 #define _FIRST_ARG(a, b, ...) b
 
 /* options flags for parse_line() */