make local variables local

.. to not interfere with variables in the scripts that source these utils.

logger.sh

@@ -13,13 +13,13 @@ loggerseparator () {
 }
 
 saferun () {
-    allcommands=""
+    local allcommands=""
     for var in "$@"; do
         allcommands="$allcommands$var /// "
     done
     logger "Enter to run the following command(s): $allcommands"
     read ok
-    ret=0
+    local ret=0
     for var in "$@"; do
         if [[ $ret -eq 0 ]]; then
             $var

mailer.sh

@@ -2,12 +2,12 @@
 
 mailer () {
 if ! [[ -z "$3" ]]; then
-    mailfrom="From: $3 <christian@betz.cc>"
+    local mailfrom="From: $3 <christian@betz.cc>"
 fi
 if ! [[ -z "$4" ]]; then
-    mailto="$4"
+    local mailto="$4"
 elif [[ -z "$mailto" ]]; then
-    mailto="christian@betz.cc"
+    local mailto="christian@betz.cc"
 fi
 
 echo -e "$1" | mailx -s "$2" --append="$mailfrom" $mailto &>/dev/null

math.sh

@@ -8,6 +8,11 @@ SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
 # https://unix.stackexchange.com/questions/89712/how-to-convert-floating-point-number-to-integer
 # xargs: https://stackoverflow.com/questions/19148370/piping-seq-to-printf-for-number-formatting
 divideint () {
+    if [ -z $3 ]; then
+        local scale=2
+    else
+        local scale=$3
+    fi
     bc <<< "scale=$scale; $1/$2" | xargs printf "%.0f\n"
 }
 
@@ -17,25 +22,25 @@ multiint () {
 
 divide () {
     if [ -z $3 ]; then
-        scale=2
+        local scale=2
     else
-        scale=$3
+        local scale=$3
     fi
     bc <<< "scale=$scale; $1/$2"
 }
 
 multiply () {
     if [ -z $3 ]; then
-        scale=2
+        local scale=2
     else
-        scale=$3
+        local scale=$3
     fi
     bc <<< "scale=$scale; $1*$2"
 }
 
 avgoftwo () {
-    sum=$(bc <<< "$1+$2")
-    divideint $sum 2
+    local sum=$(bc <<< "$1+$2")
+    divide $sum 2
 }
 
 max () {

utils.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 isarray() {
-    var=$1
+    local var=$1
     declare -p $1 2> /dev/null | grep -q '^declare \-a' && return 0
     [[ ${var[0]} -eq ${var[0]} ]] && [[ ${var[1]} -eq ${var[1]} ]] && return 0 || return 1
 }

valid-ip.sh

@@ -2,7 +2,7 @@
 
 # https://stackoverflow.com/questions/13777387/check-for-ip-validity
 function validip () {
-    ip=$1
+    local ip=$1
     if [ -z $ip ] || ! [[ $ip =~ ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
         return 1
     else