#! /bin/bash

# Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.

#

# Licensed under the OpenSSL license (the "License").  You may not use

# this file except in compliance with the License.  You can obtain a copy

# in the file LICENSE in the source distribution or at

# https://www.openssl.org/source/license.html

# Find unused error function-names and reason-codes, and edit them

# out of the source.  Doesn't handle line-wrapping, might have to do

# some manual cleanups to fix compile errors.

export X1=/tmp/f.1.$$

export X2=/tmp/f.2.$$

case "$1" in

    -f)

        PAT='_F_'

        echo Functions only

        ;;

    -[er])

        PAT='_R_'

        echo Reason codes only

        ;;

    "")

        PAT='_[FR]_'

        echo Function and reasons

        ;;

    *)

        echo "Usage error; one of -[efr] required."

        exit 1;

        ;;

esac

cd include/openssl || exit 1

grep "$PAT" *  | grep -v ERR_FATAL_ERROR | awk '{print $3;}' | sort -u >$X1

cd ../..

for F in `cat $X1` ; do

    git grep -l --full-name -F $F >$X2

    NUM=`wc -l <$X2`

    test $NUM -gt 2 && continue

    if grep -q $F crypto/err/openssl.ec ; then

        echo Possibly unused $F found in openssl.ec

        continue

    fi

    echo $F

    for FILE in `cat $X2` ; do

        grep -v -w $F <$FILE >$FILE.new

        mv $FILE.new $FILE

    done

done

rm $X1 $X2