FreeBSD/Linux Kernel Cross Reference
sys/kern/genassym.sh

     #!/bin/sh
     # $FreeBSD$
     
     # Grrr, this should use stdin and stdout, but is encrufted for compatibility.
     
     usage() {
             echo "usage: genassym [-o outfile] objfile"
             exit 1
     }
    
    outfile=/dev/stdout
    while getopts "o:" option
    do
            case "$option" in
            o)      outfile="$OPTARG";;
            *)      usage;;
            esac
    done
    shift $(($OPTIND - 1))
    case $# in
    1)      ;;
    *)      usage;;
    esac
    
    nm "$1" | awk '
    / C .*sign$/ {
            sign = substr($1, length($1) - 3, 4)
            sub("^0*", "", sign)
            if (sign != "")
                    sign = "-"
    }
    / C .*w0$/ {
            w0 = substr($1, length($1) - 3, 4)
    }
    / C .*w1$/ {
            w1 = substr($1, length($1) - 3, 4)
    }
    / C .*w2$/ {
            w2 = substr($1, length($1) - 3, 4)
    }
    / C .*w3$/ {
            w3 = substr($1, length($1) - 3, 4)
            w = w3 w2 w1 w0
            sub("^0*", "", w)
            if (w == "")
                    w = "0"
            sub("w3$", "", $3)
            # This still has minor problems representing INT_MIN, etc.  E.g.,
            # with 32-bit 2''s complement ints, this prints -0x80000000, which 
            # has the wrong type (unsigned int).
            printf("#define\t%s\t%s0x%s\n", $3, sign, w)
    }
    ' 3>"$outfile" >&3 3>&-

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