From 2a28f9f1332c06ecde12460d8bc49574e8323c59 Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Thu, 11 Apr 2019 18:41:08 -0400
Subject: main(): Replace non-portable expr and date %s spec

---
(limited to 'src')

diff --git a/src/main.sh b/src/main.sh
index d64de0e..054363d 100644
--- a/src/main.sh
+++ b/src/main.sh
@@ -34,6 +34,24 @@ else
 	builddir=''
 fi
 
+time()
+{
+	# Based on code from <https://www.etalabs.net/sh_tricks.html> by Rich
+	# Felker, with whitespace added for readability.
+	printf '%d' $(($(TZ=UTC0 date "+
+		(
+			  (%Y - 1600) * 365
+			+ (%Y - 1600) / 4
+			- (%Y - 1600) / 100
+			+ (%Y - 1600) / 400
+			+ 1%j - 1000
+			- 135140
+		) * 86400
+		+ (1%H - 100) * 3600
+		+ (1%M - 100) * 60
+		+ (1%S - 100)")))
+}
+
 main()
 {
 	local cmd=
@@ -61,7 +79,7 @@ main()
 		shift
 	fi
 
-	srand $(expr ${$} + $(date '+%s'))
+	srand $((${$} + $(time)))
 	if ! init_vardata; then
 		return 2
 	fi
--
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