#!/bin/sh
# Update abilist files based on differences on one architecture.
# Copyright (C) 2015-2016 Free Software Foundation, Inc.
# This file is part of the GNU C Library.
#
# The GNU C Library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# The GNU C Library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with the GNU C Library; if not, see
# <http://www.gnu.org/licenses/>.

set -e
export LC_ALL=C

if test $Argc -lt 3 {
  echo "usage: $0 OLD-FILE NEW-FILE FILES-TO-BE-PATCHED..." !1 > !2
  exit 2
}

setglobal old_file = $1
shift
setglobal new_file = $1
shift

setglobal tmp_old_sorted = $[mktemp]
setglobal tmp_new_sorted = $[mktemp]
setglobal tmp_new_symbols = $[mktemp]
setglobal tmp_patched = $[mktemp]

proc cleanup {
  rm -f -- $tmp_old_sorted $tmp_new_sorted \
    $tmp_new_symbols $tmp_patched
}

trap cleanup 0

sort -u -o $tmp_old_sorted -- $old_file
sort -u -o $tmp_new_sorted -- $new_file

# -1 skips symbols only in $old_file (deleted symbols).
# -3 skips symbols in both files (unchanged symbols).
comm -1 -3 $tmp_old_sorted $tmp_new_sorted > $tmp_new_symbols

setglobal new_symbol_count = $[wc -l < $tmp_new_symbols]
if test $new_symbol_count -eq 0 {
  echo "info: no symbols added" !1 > !2
  exit 0
}

echo "info: $new_symbol_count symbol(s) added" !1 > !2

for to_be_patched in [@Argv]  {
  sort -u -o $tmp_patched -- $to_be_patched $tmp_new_symbols
  if ! cmp -s -- $to_be_patched $tmp_patched {
    echo "info: updating $to_be_patched" !1 > !2
    cp -- $tmp_patched $to_be_patched
  }
}