From 1d2b85aa3aad5e487eb619e373000c047be63143 Mon Sep 17 00:00:00 2001
From: Steven Baltakatei Sandoval <baltakatei@gmail.com>
Date: Tue, 7 Jul 2020 09:59:26 +0000
Subject: [PATCH] fix(bkgpslog):Fix float calc in buffer PID adjust

---
 exec/bkgpslog | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/exec/bkgpslog b/exec/bkgpslog
index 9e23f01..7a4487f 100755
--- a/exec/bkgpslog
+++ b/exec/bkgpslog
@@ -999,7 +999,10 @@ magicBufferSleepPID() {
 	yell "WARNING:Buffer lag adjustment yielded negative seconds.";
     fi;
     ## Calculate nanosecond remainder
-    BUFFER_TTL_ADJ_FLOATFRAC="$((BUFFER_TTL_NS - (BUFFER_TTL_ADJ_INT*(10**9)) ))" && vbm "BUFFER_TTL_ADJ_FLOATFRAC:$BUFFER_TTL_ADJ_FLOATFRAC";
+    ### Remove integer
+    BUFFER_TTL_ADJ_FLOATFRAC="$((BUFFER_TTL_ADJ_NS - (BUFFER_TTL_ADJ_INT*(10**9)) ))";
+    ### Calc absolute value of fraction (by removing '-' if present; see https://stackoverflow.com/a/47240327
+    BUFFER_TTL_ADJ_FLOATFRAC="${BUFFER_TTL_ADJ_FLOAT_FRAC#-}" && vbm "BUFFER_TTL_ADJ_FLOATFRAC:$BUFFER_TTL_ADJ_FLOATFRAC";
     ## Form float BUFFER_TTL_ADJ_FLOAT
     BUFFER_TTL_ADJ_FLOAT="$BUFFER_TTL_ADJ_INT"."$BUFFER_TTL_ADJ_FLOATFRAC" && vbm "BUFFER_TTL_ADJ_FLOAT:$BUFFER_TTL_ADJ_FLOAT";
     vbm "STATUS:Calculated adjusted BUFFER_TTL (seconds):$BUFFER_TTL_ADJ_FLOAT";
-- 
2.30.2