if-pcl3

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  w)
    width="$OPTARG";;
  *)
    echo "? $name"": Illegal option specification. The call was:" >&2
    printf '  %s\n' "$*" >&2
    exit 2;;
  esac
done
test 1 = "$OPTIND" || shift `expr $OPTIND - 1`

# Deal with non-option arguments
if [ $# -gt 1 ]; then
  echo "? $name"": More than one non-option argument in the call:" >&2
  printf '  %s\n' "$*" >&2
  exit 2
fi
if [ $# -gt 0 ]; then
  accounting_file="$1"
else
  accounting_file=
fi

# Starting here, any errors occurring are sent to the job's owner
if [ '' != "$user" ]; then
  notify_user="$user"
  test '' = "$host" || notify_host="$host"
fi

#******************************************************************************

# Set up default values.

# These are the parameters which can be redefined in the configuration file.
# You might also have to use GS_OPTIONS, for example for the media type.
GS=gs
SUBDEVICE=unspec
COLOURMODEL=Gray	# Americans note the "U"! Britons note the "a"! :-)
RESOLUTION=
QUALITY=normal
PSCONFIGFILE=if-pcl3.ps
PAGECOUNTFILE=gs-pages.count
INIT_TRANS=
USE_INTERMEDIATE_FILE=yes


# Default accounting: count the number of files printed or, if supported, the
# number of pages.

acct_start()
{
  test '' = "$PAGECOUNTFILE" -o ! -f "$PAGECOUNTFILE" || cat "$PAGECOUNTFILE"

  return
}

acct_stop()
{
  pages_before="$1"
  test '' != "$pages_before" || pages_before=0

  if [ '' != "$PAGECOUNTFILE" -a -f "$PAGECOUNTFILE" ]; then
    pages_after=`cat "$PAGECOUNTFILE"`
    pages=`expr $pages_after - $pages_before`
    if [ '' = "$pages" -o 0 -ge "$pages" ]; then
      test 0 -ne "$rc" || echo "? $name"": Wrong value for number of pages" \
	"printed: \`$pages'." >&2
      pages=1	# count files instead
    fi
  else
    pages=1	# count files
  fi
  echo $pages

  return
}

#******************************************************************************

# Read the configuration file for the filter if present in the spool directory
true
cfg=if-pcl3.cfg
test ! -f $cfg -o ! -r $cfg || . ./$cfg
test $? -eq 0 || exit 2

# RESOLUTION and PSCONFIGFILE must not contain field separators
if expr "x$RESOLUTION$PSCONFIGFILE" : "x.*[$IFS]" > /dev/null; then
  printf '? %s: Shell field separator(s) in RESOLUTION (%s)\n' \
    "$name" "$RESOLUTION" >&2
  printf '  or PSCONFIGFILE (%s).\n' "$PSCONFIGFILE" >&2
  exit 2
fi

#******************************************************************************

# Initialize accounting
LC_NUMERIC=C; export LC_NUMERIC
acct_saved=`acct_start`

# stdin is the input file, stdout the printer.

rc=0
if [ '' = "$GS" ]; then
  # Transparent queue
  printf '\033E\033&k2G'   # PCL: Printer Reset, Line Termination (LF -> CR+LF)
  test '' = "$INIT_TRANS" || printf "$INIT_TRANS"
  cat
  rc=$?
else
  # An empty specifications for RESOLUTION means "use the default".
  test '' = "$RESOLUTION" || RESOLUTION="-r$RESOLUTION"

  # Remove the PostScript configuration file from the command line if it does
  # not exist or is not readable
  test '' != "$PSCONFIGFILE" -a -f "$PSCONFIGFILE" -a -r "$PSCONFIGFILE" || \
    PSCONFIGFILE=

  # If PAGECOUNTFILE is non-empty, insert an option with it in the call.
  pcf_option=
  test '' = "$PAGECOUNTFILE" || pcf_option=-sPageCountFile="$PAGECOUNTFILE"

  # We have to pass the resulting PCL file to standard output. Unfortunately,
  # if one does this directly from ghostscript (via "-sOutputFile=-"), the
  # output can contain unwanted data: error messages and data written to what
  # is standard output for PostScript. (I consider this behaviour to be a bug
  # in gs.) The latter feature is for example used by some MS Windows drivers
  # for PostScript printers in order to report the current processing state
  # back to the host.
  # If we want neither error messages nor statements like "%%[ Page: 1 ]%%" to
  # be intermixed with what is to be printed, we have to create a file first
  # and copy it to stdout in a second step. This might require substantial disk
  # space.
  # Hence I provide both solutions. Choose the one you like best by setting
  # USE_INTERMEDIATE_FILE.

  if [ no = "$USE_INTERMEDIATE_FILE" ]; then
    # Directly to stdout, hoping that other data will not appear. However,
    # in order not to loose the error message text, the following command is
    # used to ensure that this output will be printed properly and in
    # particular without a "staircase effect" provided the error occurs on the
    # first page.
    # This is for example what happens if the input file is not PostScript.
    printf '\033E\033&k2G\033&s0C'
    # PCL: Printer Reset, Line Termination (LF -> CR+LF), End-of-Line-Wrap (ON).

    # Call ghostscript
    ${GS:-gs} -q -dNOPAUSE -dSAFER -sDEVICE=pcl3 -sSubdevice="$SUBDEVICE" \
      -sColourModel="$COLOURMODEL" $RESOLUTION -sPrintQuality="$QUALITY" \
      $pcf_option -sOutputFile=- $PSCONFIGFILE -
    rc=$?
    test 0 -eq $rc || \
      printf '\n? %s: %s returned an exit code of %s.\n' "$name" "$GS" "$rc" >&2
  else
    # Two-step process with an intermediate file
    tmp="${TMPDIR:-/tmp}/$$-2.tmp"
    rm -f "$tmp"

    # Call ghostscript, redirecting stdout to stderr. Note that permissible
    # output (e.g., from "=") will be redirected to stderr as well, hence
    # we can't use the size of the resulting file as the sole indication that
    # an error has occurred.
    prev_umask=`umask`
    umask 027	# Ensure privacy. The group should be lp.
    ${GS:-gs} -q -dNOPAUSE -dSAFER -sDEVICE=pcl3 -sSubdevice="$SUBDEVICE" \
      -sColourModel="$COLOURMODEL" $RESOLUTION -sPrintQuality="$QUALITY" \
      $pcf_option -sOutputFile="$tmp" $PSCONFIGFILE - >&2
    rc=$?
    test 0 -eq $rc || \
      printf '\n? %s: %s returned an exit code of %s.\n' "$name" "$GS" "$rc" >&2
    umask "$prev_umask"

    # If an error occurred, don't bother printing.
    if [ 0 -eq $rc ]; then
      cat "$tmp"
      rc=$?
      test $rc -eq 0 || printf \
	'? %s: Error copying the generated file to stdout.\n' "$name" >&2
    fi

    rm -f "$tmp"
  fi
fi

# Reset the printer to its default state. This also ejects any unfinished pages
# which is needed if the transparent queue is used for printing ordinary text.
# It is superfluous when printing with pcl3 because pcl3 generates this at the
# end of its output already, but a second reset is harmless (unless the printer
# knows more than one command language and PCL-3+ is not the default) and it
# works even if gs crashes.
printf '\033E'	# PCL: Printer Reset

# Terminate accounting
pages=`acct_stop "$acct_saved"`

# Exit on error
test 0 -eq $rc || exit 2

#******************************************************************************

# User-specific accounting on success
if [ '' != "$accounting_file" ]; then
  printf '%7.2f\t%s:%s\n' "$pages" "$host" "$user" >> "$accounting_file"
fi

# Remove the trap for finish() in case the stderr log is non-empty although
# everything worked.
trap - 0 2

exit 0