#!/bin/sh
#
# Generate hash_info.h from kernel headers
#
# Copyright (C) 2018 <vt@altlinux.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

KERNEL_HEADERS=$1
HASH_INFO_H=uapi/linux/hash_info.h
HASH_INFO=$KERNEL_HEADERS/include/$HASH_INFO_H

# Allow to specify kernel-headers past include/
if [ ! -e $HASH_INFO ]; then
  HASH_INFO2=$KERNEL_HEADERS/$HASH_INFO_H
  if [ -e $HASH_INFO2 ]; then
    HASH_INFO=$HASH_INFO2
  fi
fi

if [ ! -e $HASH_INFO ]; then
  echo "/* $HASH_INFO is not found */"
  HASH_INFO=/dev/null
else
  echo "/* $HASH_INFO is found */"
fi

echo "enum hash_algo {"
grep HASH_ALGO_.*, $HASH_INFO
printf "\tHASH_ALGO__LAST\n"
echo "};"

echo "const char *const hash_algo_name[HASH_ALGO__LAST] = {"
sed -n 's/HASH_ALGO_\(.*\),/\1 \L\1\E/p' $HASH_INFO | \
  while read a b; do
    # Normalize text hash name: if it contains underscore between
    # digits replace it with a dash, other underscores are removed.
    b=$(echo "$b" | sed "s/\([0-9]\)_\([0-9]\)/\1-\2/g;s/_//g")
    printf '\t%-26s = "%s",\n' "[HASH_ALGO_$a]" "$b"
  done
echo "};"