From 67bc01e9c5eefcd974d76e1f648b5ed95ba3a82b Mon Sep 17 00:00:00 2001
From: Ivan Ilves <ivan.ilves@gmail.com>
Date: Sat, 22 Apr 2017 19:56:23 +0200
Subject: [PATCH] Guard against zero value

---
 xiringuito | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/xiringuito b/xiringuito
index 6d023e4..4f5979d 100755
--- a/xiringuito
+++ b/xiringuito
@@ -42,8 +42,12 @@ while getopts "f:RDrh" o; do
   case ${o} in
     f)
       MAX_FAILED_PINGS=${OPTARG}
-      if [[ ! ${MAX_FAILED_PINGS} =~ [0-9]{1,} ]]; then
-        echo "'-f' option accepts only integer values"
+      if [[ ! ${MAX_FAILED_PINGS} =~ ^[0-9]{1,}$ ]]; then
+        echo "'-f' option accepts only positive integer values"
+        exit 1
+      fi
+      if [[ ${MAX_FAILED_PINGS} -eq 0 ]]; then
+        echo "'-f' option value should be greater then zero"
         exit 1
       fi
       ;;