From 401d49ceb8a3ccc6a4bae6279ca2cf4dc22e6671 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Thu, 22 Jun 2017 20:49:12 +0200
Subject: [PATCH] time-util: rename usec_sub() to usec_sub_signed() and add
 usec_sub_unsigned()

Quite often we just want to subtract two normal usec_t values, hence
provide an implementation for that.
---
 src/basic/time-util.c | 12 ++++++------
 src/basic/time-util.h | 14 +++++++++-----
 2 files changed, 15 insertions(+), 11 deletions(-)

diff --git a/src/basic/time-util.c b/src/basic/time-util.c
index f6d5621ed..37d5f7886 100644
--- a/src/basic/time-util.c
+++ b/src/basic/time-util.c
@@ -109,7 +109,7 @@ dual_timestamp* dual_timestamp_from_realtime(dual_timestamp *ts, usec_t u) {
         ts->realtime = u;
 
         delta = (int64_t) now(CLOCK_REALTIME) - (int64_t) u;
-        ts->monotonic = usec_sub(now(CLOCK_MONOTONIC), delta);
+        ts->monotonic = usec_sub_signed(now(CLOCK_MONOTONIC), delta);
 
         return ts;
 }
@@ -127,8 +127,8 @@ triple_timestamp* triple_timestamp_from_realtime(triple_timestamp *ts, usec_t u)
 
         ts->realtime = u;
         delta = (int64_t) now(CLOCK_REALTIME) - (int64_t) u;
-        ts->monotonic = usec_sub(now(CLOCK_MONOTONIC), delta);
-        ts->boottime = clock_boottime_supported() ? usec_sub(now(CLOCK_BOOTTIME), delta) : USEC_INFINITY;
+        ts->monotonic = usec_sub_signed(now(CLOCK_MONOTONIC), delta);
+        ts->boottime = clock_boottime_supported() ? usec_sub_signed(now(CLOCK_BOOTTIME), delta) : USEC_INFINITY;
 
         return ts;
 }
@@ -144,7 +144,7 @@ dual_timestamp* dual_timestamp_from_monotonic(dual_timestamp *ts, usec_t u) {
 
         ts->monotonic = u;
         delta = (int64_t) now(CLOCK_MONOTONIC) - (int64_t) u;
-        ts->realtime = usec_sub(now(CLOCK_REALTIME), delta);
+        ts->realtime = usec_sub_signed(now(CLOCK_REALTIME), delta);
 
         return ts;
 }
@@ -159,8 +159,8 @@ dual_timestamp* dual_timestamp_from_boottime_or_monotonic(dual_timestamp *ts, us
 
         dual_timestamp_get(ts);
         delta = (int64_t) now(clock_boottime_or_monotonic()) - (int64_t) u;
-        ts->realtime = usec_sub(ts->realtime, delta);
-        ts->monotonic = usec_sub(ts->monotonic, delta);
+        ts->realtime = usec_sub_signed(ts->realtime, delta);
+        ts->monotonic = usec_sub_signed(ts->monotonic, delta);
 
         return ts;
 }
diff --git a/src/basic/time-util.h b/src/basic/time-util.h
index 2ea7e8b51..a6df932ad 100644
--- a/src/basic/time-util.h
+++ b/src/basic/time-util.h
@@ -191,19 +191,23 @@ static inline usec_t usec_add(usec_t a, usec_t b) {
         return c;
 }
 
-static inline usec_t usec_sub(usec_t timestamp, int64_t delta) {
-        if (delta < 0)
-                return usec_add(timestamp, (usec_t) (-delta));
+static inline usec_t usec_sub_unsigned(usec_t timestamp, usec_t delta) {
 
         if (timestamp == USEC_INFINITY) /* Make sure infinity doesn't degrade */
                 return USEC_INFINITY;
-
-        if (timestamp < (usec_t) delta)
+        if (timestamp < delta)
                 return 0;
 
         return timestamp - delta;
 }
 
+static inline usec_t usec_sub_signed(usec_t timestamp, int64_t delta) {
+        if (delta < 0)
+                return usec_add(timestamp, (usec_t) (-delta));
+        else
+                return usec_sub_unsigned(timestamp, (usec_t) delta);
+}
+
 #if SIZEOF_TIME_T == 8
 /* The last second we can format is 31. Dec 9999, 1s before midnight, because otherwise we'd enter 5 digit year
  * territory. However, since we want to stay away from this in all timezones we take one day off. */
-- 
2.30.2