remcomms.sh

# Strip C comments
# by Stewart Ravenhall <stewart.ravenhall@ukonline.co.uk> -- 4 October 2000
# Un-Korn-ized by Paolo Bonzini <bonzini@gnu.org> -- 24 November 2000
# Modifications to handle C++ comments by D. R. Commander -- 15 March 2018

# Strip everything between /* and */ inclusive

# Copes with multi-line comments,
# disassociated end comment symbols,
# disassociated start comment symbols,
# multiple comments per line

# Check given file exists
program=`echo $0|sed -e 's:.*/::'`
if [ "$#" = 1 ] && [ "$1" != "-" ] && [ ! -f "$1" ]; then
        print "$program: $1 does not exist"
        exit 2
fi

# Create shell variables for ASCII 1 (control-a)
# and ASCII 2 (control-b)
a="`echo | tr '\012' '\001'`"
b="`echo | tr '\012' '\002'`"

sed '
        # If no start comment then go to end of script
        /\/\*/!b
        :a
        s:/\*:'"$a"':g
        s:\*/:'"$b"':g

        # If no end comment
    /'"$b"'/!{
        :b

                # If not last line then read in next one
                $!{
                        N
                        ba
                }

                # If last line then remove from start
                # comment to end of line
                # then go to end of script
                s:'"$a[^$b]"'*$::
                bc
        }

        # Remove comments
        '"s:$a[^$b]*$b"'::g
    /'"$a"'/ bb

        :c
        s:'"$a"':/*:g
        s:'"$b"':*/:g
' $1 | sed 's@[ ]*\/\/.*$@@g'