From 362fc4556d1e46e4c018fe4421655dc6bdc2e7e5 Mon Sep 17 00:00:00 2001
From: Carsten Kutzner <ckutzne@gwdg.de>
Date: Wed, 16 Feb 2011 17:37:06 +0100
Subject: [PATCH] Fixed int overflow happening in genion when number of water
 molecules is large

---
 src/tools/gmx_genion.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/tools/gmx_genion.c b/src/tools/gmx_genion.c
index c1c209ac60..5cff773328 100644
--- a/src/tools/gmx_genion.c
+++ b/src/tools/gmx_genion.c
@@ -71,11 +71,12 @@ static void insert_ion(int nsa,int *nwater,
   real extr_e,poti,rmin2;
   rvec xei,dx;
   gmx_bool bSub=FALSE;
-  int  maxrand;
+  gmx_large_int_t maxrand;
   
   ei=-1;
   nw = *nwater;
-  maxrand = 1000*nw;
+  maxrand  = nw;
+  maxrand *= 1000;
   if (bRandom) {
     do {
       ei = nw*rando(seed);
-- 
2.22.0