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unix-lpr.sh
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#!/bin/sh # # Unix lpr filter. The default setup sends output directly to a pipe, # which requires the Ghostscript process to fork, and thus may cause # small systems to run out of memory/swap space. An alternative strategy, # based on a suggestion by Andy Fyfe (andy@cs.caltech.edu), uses a named # pipe for output, which avoids the fork and can thus save a lot of memory. # # Unfortunately this approach can cause problems when a print job is aborted, # as the abort can cause one of the processes to die, leaving the process # at the other end of the pipe hanging forever. # # Because of this, the named pipe method has not been made the default, # but it may be restored by commenting out the lines referring to # 'gsoutput' and uncommenting the lines referring to 'gspipe'. # # This definition is changed on install to match the # executable name set in the makefile GS_EXECUTABLE=gs PBMPLUSPATH=/usr/local/bin PSFILTERPATH=/usr/local/lib/ghostscript LOCALPATH=/usr/local/bin X11HOME=/usr/X11R6 PATH=/bin:/usr/bin:/usr/ucb:/usr/etc PATH=${PATH}\:${LOCALPATH}\:${PBMPLUSPATH}\:${PSFILTERPATH} LD_LIBRARY_PATH=${X11HOME}/lib export PATH LD_LIBRARY_PATH acctfile host user user= host= acctfile=/dev/null # # Redirect stdout to stderr (for the logfile) and open a new channel # connected to stdout for the raw data. This enables us to keep the # raw data separate from programmed postscript output and error messages. # exec 3>&1 1>&2 # # Get username and hostname from filter parameters # while [ $# != 0 ] do case "$1" in -n) user=$2 ; shift ;; -h) host=$2 ; shift ;; -*) ;; *) acctfile=$1 ;; esac shift done # # Get the filter, printer device and queue type (direct/indirect) # filter=`basename $0` device=`dirname $0` type=`dirname ${device}` device=`basename ${device}` fdevname=$device type=`basename ${type}` # # Find the bpp and number of colors, if specified # colorspec="`echo ${device} | sed 's/.*\.[0-9][0-9]*\.\([0-9][0-9]*\)$/\1/'`" if test "$colorspec" = "${device}" then colorspec="" else device=`basename ${device} .$colorspec` colorspec="-dColors=$colorspec" fi bpp="`echo ${device} | sed 's/.*\.\([0-9][0-9]*\)$/\1/'`" if test "$bpp" = "${device}" then bpp=1 else device=`basename ${device} .$bpp` fi # # Information for the logfile # lock=`dirname ${acctfile}`/lock cf=`sed -n '$p' ${lock}` job=`sed -n 's/^J//p' ${cf}` echo "gsbanner: ${host}:${user} Job: ${job} Date: `date`" echo "gsif: ${host}:${user} ${fdevname} start - `date`" # # Set the direct or indirect output destinations # #gspipe=/tmp/gspipe.$$ #mknod ${gspipe} p case "${type}" in direct) gsoutput="cat 1>&3" ;; # cat ${gspipe} 1>&3 & ;; indirect) gsoutput="lpr -P${device}.raw" ;; # cat ${gspipe} | lpr -P${device}.raw & ;; esac ( # # Any setup required may be done here (eg. setting gamma for colour printing) # #echo "{0.333 exp} dup dup currenttransfer setcolortransfer" # # The input data is filtered here, before being passed on to Ghostscript # case "${filter}" in gsif) cat ;; gsnf) psdit ;; gstf) pscat ;; gsgf) psplot ;; gsvf) rasttopnm | pnmtops ;; gsdf) dvi2ps -sqlw ;; gscf|gsrf) echo "${filter}: filter not available" 1>&2 ; exit 0 ;; esac # # This is the postlude which does the accounting # echo "\ (acctfile) getenv { currentdevice /PageCount gsgetdeviceprop dup cvi 0 gt { exch (a) file /acctfile exch def /string 20 string def string cvs dup length dup 4 lt { 4 exch sub { acctfile ( ) writestring } repeat } { pop } ifelse acctfile exch writestring acctfile (.00 ) writestring acctfile (host) getenv { string cvs } { (NOHOST) } ifelse writestring acctfile (:) writestring acctfile (user) getenv { string cvs } { (NOUSER) } ifelse writestring acctfile (\n) writestring acctfile closefile } { pop } ifelse } if quit" ) | $GS_EXECUTABLE -q -P- -dSAFER -dNOPAUSE -sDEVICE=${device} \ -dBitsPerPixel=${bpp} $colorspec \ -sOutputFile=\|"${gsoutput}" - # -sOutputFile=${gspipe} - rm -f ${gspipe} # # End the logfile entry # echo "gsif: end - `date`"