#! /bin/sh
# @(#) $Id: b-map.in,v 1.4 2003/12/22 15:32:37 yeti Exp $
# map batch-call wrapper.
# To be called by enca, don't use directly. See enca(1) for calling convention.
#
# Copyright (C) 2000-2003 David Necas (Yeti) <yeti@physics.muni.cz>.
# This is free software; it can be copied and/or modified under the terms of
# version 2 of GNU General Public License, see COPYING for details.  There is
# NO WARRANTY; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
transform_enc_name() {
  echo "$1" | sed -e 's:/.*::'
}
if test "x$3" = "x"; then
  echo "$0 has to be called by enca" 1>&2
  exit 1
fi
umask 077
inenc=`transform_enc_name "$1"`
outenc=`transform_enc_name "$2"`
if test "$4" = "-"; then
  # Note map returns 0 on failure and 1 on success!
  if map --from "$inenc" --to "$outenc" <"$3"; then
    echo "$0: map --from $inenc --to $outenc failed" 1>&2
    rm -- "$3"
    exit 1
  else
    rm -- "$3"
  fi
else
  temp=@SHELL_RANDOM_FILENAME@ || exit 1
  # Note map returns 0 on failure and 1 on success!
  if map --from "$inenc" --to "$outenc" <"$3" >"$temp"; then
    echo "$0: map --from $inenc --to $outenc <$3 failed, file $3 unchanged" 1>&2
    rm -f $temp
    exit 1
  else
    # use cat > to preserve permissions
    cat $temp >"$3"
  fi
  rm -f $temp
fi
