From b7ce6b592d8908d378904323a4a6670bfe0b7ab1 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Mon, 2 Feb 2015 21:28:19 +0100
Subject: macro: document that DECIMAL_STR_MAX contains space for the trailing
 NUL byte

---
 src/shared/macro.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/shared/macro.h b/src/shared/macro.h
index e88630fa04..7f89951d62 100644
--- a/src/shared/macro.h
+++ b/src/shared/macro.h
@@ -383,7 +383,8 @@ do {                                                                    \
 
 /* Returns the number of chars needed to format variables of the
  * specified type as a decimal string. Adds in extra space for a
- * negative '-' prefix. */
+ * negative '-' prefix (hence works correctly on signed
+ * types). Includes space for the trailing NUL. */
 #define DECIMAL_STR_MAX(type)                                           \
         (2+(sizeof(type) <= 1 ? 3 :                                     \
             sizeof(type) <= 2 ? 5 :                                     \
-- 
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