From 1ead0b2a7973782f4bacaab2d9deed94ac69d867 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Wed, 17 Feb 2021 17:29:43 +0100
Subject: [PATCH] parse-util: add format string macro for outputting permyriad

Let's define a set of macros for making output of permyriad values easy.
They are printed in pure ASCII, i.e. without the permille/permyriad
suffix, using just percent and two places after the dot.
---
 src/basic/percent-util.h | 3 +++
 src/core/cgroup.c        | 1 +
 src/core/dbus-cgroup.c   | 4 ++--
 3 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/basic/percent-util.h b/src/basic/percent-util.h
index d806ec007a..24f4c3bdef 100644
--- a/src/basic/percent-util.h
+++ b/src/basic/percent-util.h
@@ -59,3 +59,6 @@ static inline int UINT32_SCALE_TO_PERMYRIAD(uint32_t scale) {
 
         return (int) u;
 }
+
+#define PERMYRIAD_AS_PERCENT_FORMAT_STR "%i.%02i%%"
+#define PERMYRIAD_AS_PERCENT_FORMAT_VAL(x) ((x)/100), ((x)%100)
diff --git a/src/core/cgroup.c b/src/core/cgroup.c
index b0fc67a125..644bf50e7d 100644
--- a/src/core/cgroup.c
+++ b/src/core/cgroup.c
@@ -21,6 +21,7 @@
 #include "nulstr-util.h"
 #include "parse-util.h"
 #include "path-util.h"
+#include "percent-util.h"
 #include "process-util.h"
 #include "procfs-util.h"
 #include "special.h"
diff --git a/src/core/dbus-cgroup.c b/src/core/dbus-cgroup.c
index e22233d6ff..5bf9d7f4a8 100644
--- a/src/core/dbus-cgroup.c
+++ b/src/core/dbus-cgroup.c
@@ -706,9 +706,9 @@ static int bus_cgroup_set_boolean(
                         assert_se(endswith(name, "Scale"));             \
                                                                         \
                         int scaled = UINT32_SCALE_TO_PERMYRIAD(raw);    \
-                        unit_write_settingf(u, flags, name, "%.*s=%i.%02i%%", \
+                        unit_write_settingf(u, flags, name, "%.*s=" PERMYRIAD_AS_PERCENT_FORMAT_STR, \
                                             (int)(strlen(name) - strlen("Scale")), name, \
-                                            scaled / 100, scaled % 100);  \
+                                            PERMYRIAD_AS_PERCENT_FORMAT_VAL(scaled)); \
                 }                                                       \
                                                                         \
                 return 1;                                               \