From 9c1f2b2123b95125caeda5f44ba461dbfa3993ab Mon Sep 17 00:00:00 2001
From: Eric Fischer <enf@pobox.com>
Date: Fri, 17 Feb 2017 14:14:55 -0800
Subject: [PATCH] Guard against potentially rounding to 0 when choosing sorting
 unit

---
 main.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/main.cpp b/main.cpp
index 30cc4a7..03f1b0d 100644
--- a/main.cpp
+++ b/main.cpp
@@ -708,6 +708,9 @@ void radix1(int *geomfds_in, int *indexfds_in, int inputs, int prefix, int split
 					unit = max_unit;
 				}
 				unit = ((unit + page - 1) / page) * page;
+				if (unit < page) {
+					unit = page;
+				}
 
 				size_t nmerges = (indexpos + unit - 1) / unit;
 				struct mergelist merges[nmerges];