#!/bin/sh

FILE="$1"
RES="$FILE"

CUT_ARG="-b1"
if [ `uname -s` = "QNX" ]; then
    # QNX does not understand "-b1"
    CUT_ARG="-c1"
fi

if [ `echo $FILE | cut $CUT_ARG` = "/" ]; then
    true
elif [ "$OSTYPE" = "msys" -a -z "${FILE##[a-zA-Z]:[/\\]*}" ]; then
    true
else
    RES="$PWD/$FILE"
fi
RES=$RES/
while true; do
    nres=`echo "$RES" | sed "s,/[^/][^/]*/\.\./,/,g; s,/\./,/,g"`
    test x"$nres" = x"$RES" && break
    RES=$nres
done
RES=`echo "$RES" | sed "s,//,/,g; s,/$,,"`
echo $RES #return