: # *-*-perl-*-*
    eval 'exec perl -S $0 "$@"'
    if $running_under_some_shell;  
#
#  ps2txt - PostScript to ASCII converter
#
#  Usage: ps2txt filename
#
#  Uses ps2txt version 2.1 (as posted to alt.sources) as the main 
#  PostScript conversion engine.  This Perl program acts as a pre- 
#  and post- processor to improve the quality of the ps2txt output.
#
#  Forks off the ps2txt command, and builds a pipeline to feed/filter it.
#
#  Darren Hardy, hardy@cs.colorado.edu, May 1994
#
#  $Id: ps2txt,v 1.4 1995/03/22 06:57:58 hardy Exp $
#
#######################################################################
#
#  Copyright (c) 1994, 1995.  All rights reserved.
#  
#          Mic Bowman of Transarc Corporation.
#          Peter Danzig of the University of Southern California.
#          Darren R. Hardy of the University of Colorado at Boulder.
#          Udi Manber of the University of Arizona.
#          Michael F. Schwartz of the University of Colorado at Boulder. 
#          Duane Wessels of the University of Colorado at Boulder. 
#  
#  This copyright notice applies to all code in Harvest other than
#  subsystems developed elsewhere, which contain other copyright notices
#  in their source text.
#  
#  The Harvest software was developed by the Internet Research Task
#  Force Research Group on Resource Discovery (IRTF-RD).  The Harvest
#  software may be used for academic, research, government, and internal
#  business purposes without charge.  If you wish to sell or distribute
#  the Harvest software to commercial clients or partners, you must
#  license the software.  See
#  http://harvest.cs.colorado.edu/harvest/copyright,licensing.html#licensing.
#  
#  The Harvest software is provided ``as is'', without express or
#  implied warranty, and with no support nor obligation to assist in its
#  use, correction, modification or enhancement.  We assume no liability
#  with respect to the infringement of copyrights, trade secrets, or any
#  patents, and are not responsible for consequential damages.  Proper
#  use of the Harvest software is entirely the responsibility of the user.
#  
#  For those who are using Harvest for non-commercial purposes, you may
#  make derivative works, subject to the following constraints:
#  
#  - You must include the above copyright notice and these accompanying 
#    paragraphs in all forms of derivative works, and any documentation 
#    and other materials related to such distribution and use acknowledge 
#    that the software was developed at the above institutions.
#  
#  - You must notify IRTF-RD regarding your distribution of the 
#    derivative work.
#  
#  - You must clearly notify users that your are distributing a modified 
#    version and not the original Harvest software.
#  
#  - Any derivative product is also subject to the restrictions of the 
#    copyright, including distribution and use limitations.
#

&usage() if ($#ARGV != 0);

$filename = shift(@ARGV);

$ps2txt_cmd = "ps2txt-2.1";
$dviflag = "";

$SIG{'INT'} = "cleanup";
$SIG{'PIPE'} = "cleanup";
$SIG{'TERM'} = "cleanup";

#
#  Read the PostScript file and strip the Prolog.  Determine if the
#  PostScript was generated by dvips.
#
$start = 0;
open(IN, "$filename") || die "Cannot read $filename: $!\n";
while (<IN>) {
	$start = 1 if (/^%%EndProlog/o);
	$dviflag = "-dvi" if (/^%.*Creator:\s+dvips.*$/o);
	next if ($start == 0);
	last;	# break the loop
}
seek(IN, 0, 0) if ($start == 0);	# rewind the file to the beginning

#
#  this  ps2txt
#    B--->A 
#
pipe(A, B) || die "pipe";	# A is read, B is write

die "fork" if (($pid = fork()) < 0);

if ($pid == 0) {		# child - ps2txt
	close(B);
	open(STDIN, "<&A") || die "open";
	exec("$ps2txt_cmd $dviflag");
	exit(0);
}
close(A);
while (<IN>) {
	print B;	# feed the ps file to the ps2txt process
}
close(IN);
close(B);		# finish off the pipe
&cleanup();
exit(0);		# END OF PROGRAM

sub cleanup {
	exit(0);
}

sub usage {
	print STDERR "Usage: ps2txt filename\n";
	exit(1);
}
