xref: /illumos-gate/usr/src/cmd/lp/filter/postscript/dpost/dpost.c (revision 2a8bcb4e)

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 * Copyright (c) 2016 by Delphix. All rights reserved.
 */

/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
/*	  All Rights Reserved  	*/

/*
 *
 * dpost - troff post-processor for PostScript printers.
 *
 * A program that translates output generated by the device independent troff
 * into PostScript. Much was borrowed from dimpress and dps (formally dlzw),
 * and even though the code has been changed, credit has to be given to Richard
 * Flood for his early work on the PostScript driver.
 *
 * Among the most interesting new features are color support (see devcntrl() and
 * file color.c) and code to handle complex paths pieced together using any of the
 * standard drawing commands (see devcntrl() and file draw.c). Reverse video mode
 * has also been included as a special case of the color support. Two encoding
 * schemes based on widthshow are also new additions. The safe one is obtained when
 * you set encoding to 2 (eg. using the -e2 option). The slightly faster method
 * is obtained by setting encoding to 3 (eg. using the -e3 option), although it's
 * not recommended. Rounding errors in character widths can accumulate and become
 * quite noticeable by the time you get to the right margin. More often than not
 * you end up getting a ragged right margin.
 *
 * The program handles files formatted for any device, although the best and
 * most efficient output is generated when the font and description files match
 * PostScript's resident fonts. Device emulation is relatively expensive, and
 * can produce output files that are more than twice the size of the input files.
 * In most cases output files will be smaller than input files, perhaps by up to
 * 40 percent, although the results you get depend on what you're doing and the
 * text encoding you're using. You'll get the worst results if you're emulating
 * another device, using special bitmap characters, like the logo, or doing lots
 * of vertical motion or drawing.
 *
 * PostScript fonts don't support all of troff's characters, so some have to
 * be built by special PostScript procedures. Those routines can be found in
 * *fontdir/devpost/charlib, and are only used when we try to print a character
 * that has been assigned a code less than 32. Definitions are only made the
 * first time each character is used. Subsequent requests to print the character
 * only generate a call to the PostScript procedure that's been copied to the
 * output file. For example you'll find a file called sq in directory
 * *fontdir/devpost/charlib. It defines a PostScript procedure called build_sq
 * that's called whenever we need to print a square. Special characters that
 * have been assigned a code of 2 are expected to come in two pieces. The
 * definition part and bitmap part (or whatever). The definition is only made
 * once, but the contents of the character's .map file are copied to the output
 * file each time, immediately after charlib() generates the call to the
 * PostScript procedure (build_?? ) that builds the character. That's typically
 * how logos built from bitmaps would be handled.
 *
 * Several different methods can be used to encode lines of text. What's done
 * depends on the value assigned to encoding. Print time should decrease as
 * encoding increases (up to MAXENCODING). Setting encoding to 0, which should
 * probably be the default, produces output essentially identical to the original
 * version of dpost. It's the slowest but most stable method of encoding lines of
 * text, and won't be bothered by rounding errors in the font width tables that
 * could become noticeable by the time you get to the end of a line. Other schemes
 * seem to work, but aren't well tested and are not guaranteed for all possible
 * jobs. encoding can be changed on the command line using the -e option. Part of
 * the support for different encoding schemes was to move control of all text
 * related output to separate routines. It makes dpost work harder, but changing
 * things is easy. For example adding stuff to support widthshow took less than
 * an hour.
 *
 * According to Adobe's structuring conventions, the output produced by dpost is
 * still nonconforming. Global definitions that are occasionally made in individual
 * pages are the primary problem. Among other things they handle downloading host
 * resident fonts and defining special characters not generally available on
 * PostScript printers. The approach used here works on a demand basis and violates
 * page independence. A definition is made once in the first page that needs it
 * and is bracketed by PostScript code that ensures the definition is exported to
 * the global environment where it will be available for use by all the pages that
 * follow.  Simple changes, like downloading definitions the first time they're
 * used in each page, restores page independence but wouldn't be an efficient
 * solution. Other approaches are also available, but every one I've considered
 * sacrifices much in efficiency - just to maintain page independence. I'll leave
 * things be for now. Global definitions made in individual pages are bracketed
 * by %%BeginGlobal and %%EndGlobal comments and can easily be pulled out of
 * individual pages and put in the prologue by utility programs like postreverse.
 *
 * I've also added code that handles the DOCUMENTFONTS comment, although it's
 * only produced for those fonts in directory /usr/lib/font/devpost that have an
 * associated .name file. The first string in a .name file should be the (long)
 * PostScript name (eg. Times-Roman in R.name). For now everything else in the
 * .name file is ignored, although that may also change. You'll find .name files
 * for all the supported fonts in the devpost source directory, although they may
 * not be installed in /usr/lib/font/devpost.
 *
 * The PostScript prologue is copied from *prologue before any of the input files
 * are translated. The program expects the following procedures are avaliable:
 *
 *	setup
 *
 *	  mark ... setup -
 *
 *	    Handles special initialization stuff that depends on how the program
 *	    was called. Expects to find a mark followed by key/value pairs on the
 *	    stack. The def operator is applied to each pair up to the mark, then
 *	    the default state is set up. An 'x res' command must preceed the
 *	    'x init' command!
 *
 *	pagesetup
 *
 *	  page pagesetup -
 *
 *	    Called at the start of each page, immediately after the page level
 *	    save, to do special initialization on a per page basis. Right now the
 *	    only argument is the current page number, and actually nothing of any
 *	    importance is currently done.
 *
 *	setdecoding
 *
 *	  num setdecoding -
 *
 *	    Selects the text decoding procedure (ie. what's assigned to PostScript
 *	    procedure t) from the decodingdefs array defined in the prologue. num
 *	    should be the value assigned to variable encoding (in dpost) and will
 *	    remain constant throughout a job, unless special features, like reverse
 *	    video printing, are requested. The text encoding scheme can be set on
 *	    the command line using the -e option. Print time and the size of the
 *	    output file will usually decrease as the value assigned to encoding
 *	    increases.
 *
 *	f
 *
 *	  size font f -
 *
 *	    Selects the size and font to be used for character imaging. Font names
 *	    are defined, in *prologue, so they agree with the one or two character
 *	    names used by troff.
 *
 *	m
 *
 *	  x y m -
 *
 *	    Moves to point (x, y). Normally only used when the vertical position
 *	    changes. Horizontal positioning between words (or letters) is handled
 *	    in procedure t (below).
 *
 *	t
 *
 *	  mark text t mark
 *
 *	    Processes everything on the stack, up to the mark, as a single line
 *	    of text to be printed at a fixed vertical position. What's put out as
 *	    text depends on the encoding scheme. Setting encoding to 0 produces
 *	    output essentially identical to the original version of dpost. In that
 *	    case everything on the stack, up to a mark, is interpreted (from top
 *	    down) as an absolute horizontal position and a string to be printed at
 *	    that point. For example the stack might look like,
 *
 *		mark(this)1000(is)1100(an)1200(example)1300 t
 *
 *	    Procedure t would go through the stack, up to the mark, adjusting the
 *	    horizontal position before printing each string. In other encoding
 *	    schemes, like the one based on widthshow, strings containing several
 *	    space separated words would appear on the stack, and each one would be
 *	    preceeded by a number that's expected to be added to the width of a
 *	    space. For example we might have,
 *
 *		mark(an example)30(this is)40 2 1000 2000 t
 *
 *	    where (1000, 2000) is where the first string starts and 2 is the repeat
 *	    count (ie. number of string and space pairs on the stack).
 *
 *	w
 *
 *	  string x y w -
 *
 *	    Prints a single word starting at position (x, y). Only used in the more
 *	    complicated encoding schemes (eg. the ones based on widthshow).
 *
 *	done
 *
 *	    Makes sure the last page is printed. Only needed when we're printing
 *	    more than one page on each sheet of paper.
 *
 * The PostScript procedures that support troff's drawing commands have been moved
 * out of *prologue and put in a separate file (ie. DRAW as defined in path.h).
 * The procedures are used by the routines in file draw.c, and are copied to the
 * output file at most once and only when needed. Yet another convenient violation
 * of page independence. If you don't approve append *drawfile to *prologue and
 * make sure *drawfile can't be read when DPOST runs.
 *
 * Many default values, like the magnification and orientation, are defined in
 * the prologue, which is where they belong. If they're changed (by options), an
 * appropriate definition is made after the prologue is added to the output file.
 * The -P option passes arbitrary PostScript through to the output file. Among
 * other things it can be used to set (or change) values that can't be accessed by
 * other options.
 *
 *
 * output language from troff:
 * all numbers are character strings
 *
 * sn	size in points
 * fn	font as number from 1-n
 * cx	ascii character x
 * Cxyz	funny char xyz. terminated by white space
 * Hn	go to absolute horizontal position n
 * Vn	go to absolute vertical position n (down is positive)
 * hn	go n units horizontally (relative)
 * vn	ditto vertically
 * nnc	move right nn, then print c (exactly 2 digits!)
 * 		(this wart is an optimization that shrinks output file size
 * 		 about 35% and run-time about 15% while preserving ascii-ness)
 * Dt ...\n	draw operation 't':
 * 	Dl x y		line from here by x,y
 * 	Dc d		circle of diameter d with left side here
 * 	De x y		ellipse of axes x,y with left side here
 *	Da x1 y1 x2 y2	arc counter-clockwise from current point (x, y) to
 *			(x + x1 + x2, y + y1 + y2)
 * 	D~ x y x y ...	wiggly line by x,y then x,y ...
 * nb a	end of line (information only -- no action needed)
 * 	b = space before line, a = after
 * p	new page begins -- set v to 0
 * #...\n	comment
 * x ...\n	device control functions:
 * 	x i	init
 * 	x T s	name of device is s
 * 	x r n h v	resolution is n/inch
 * 		h = min horizontal motion, v = min vert
 * 	x p	pause (can restart)
 * 	x s	stop -- done forever
 * 	x t	generate trailer
 * 	x f n s	font position n contains font s
 * 	x H n	set character height to n
 * 	x S n	set slant to N
 *
 * 	Subcommands like "i" are often spelled out like "init".
 *
 */


#include	<stdio.h>
#include	<fcntl.h>
#include	<signal.h>
#include	<math.h>
#include	<ctype.h>
#include	<time.h>

#include	"comments.h"		/* PostScript file structuring comments */
#include	"gen.h"			/* general purpose definitions */
#include	"path.h"		/* for the prologue and a few other files */
#include	"ext.h"			/* external variable definitions */
#include	"dev.h"			/* typesetter and font descriptions */
#include	"dpost.h"		/* a few definitions just used here */


char		*prologue = DPOST;	/* the basic PostScript prologue */
char		*colorfile = COLOR;	/* things needed for color support */
char		*drawfile = DRAW;	/* and drawing */
char		*formfile = FORMFILE;	/* stuff for multiple pages per sheet */
char		*baselinefile = BASELINE;

char		*fontdir = FONTDIR;	/* binary device directories found here */
char		*hostfontdir = NULL;	/* host resident font directory */

int		formsperpage = 1;	/* page images on each piece of paper */
int		copies = 1;		/* and this many copies of each sheet */
int		picflag = ON;		/* enable/disable picture inclusion */


/*
 *
 * encoding selects the encoding scheme used to output lines of text. Change it
 * to something other than 0 at your own risk. The other methods seem to work but
 * aren't well tested and are not guaranteed. Some special features, like reverse
 * video, may temporarily change the encoding scheme and reset it to realencoding
 * when done.
 *
 */


int		encoding = DFLTENCODING;
int		realencoding = DFLTENCODING;
int		maxencoding = MAXENCODING;


/*
 *
 * seenfonts[] keeps track of the fonts we've used, based on internal numbers. It
 * helps manage host resident fonts and the DOCUMENTFONTS comment, but only works
 * if all fonts have internal numbers less than MAXINTERNAL. *docfonts counts the
 * number of font names we've recorded in *temp_file. If it's positive routine
 * done() adds *temp_file to the output file before quitting.
 *
 */


char		seenfonts[MAXINTERNAL+1];
int		docfonts = 0;


/*
 *
 * devname[] is the device troff used when the job was formatted, while *realdev
 * is combined with *fontdir and used to locate the font and device tables that
 * that control the translation of the input files into PostScript. *realdev can
 * be changed using the -T option, but if you do you may end up getting garbage.
 * The character code field must agree with PostScript's font encoding and font
 * names must be properly mapped into PostScript font names in the prologue.
 *
 */


char		devname[20] = "";	/* job is formatted for this printer */
char		*realdev = DEVNAME;	/* a good description of target printer */


/*
 *
 * Standard things that come from binary font and description files for *realdev.
 * Most are initialized in fontinit() or loadfont().
 *
 */


struct dev	dev;			/* DESC.out starts this way */
struct Font	*fontbase[NFONT+1];	/* FONT.out files begin this way */
short		*pstab;			/* list of available sizes */
int		nsizes = 1;		/* and the number of sizes in that list */
int		smnt;			/* index of first special font */
int		nchtab;			/* number of special character names */
int		fsize;			/* max size of a font files in bytes */
int		unitwidth;		/* set to dev.unitwidth */
char		*chname;		/* special character strings */
short		*chtab;			/* used to locate character names */
char		*fitab[NFONT+1];	/* locates char info on each font */
char		*widthtab[NFONT+1];	/* character width data for each font */
char		*codetab[NFONT+1];	/* and codes to get characters printed */


/*
 *
 * Special characters missing from standard PostScript fonts are defined by files
 * in directory *fontdir/devpost/charlib. Files have the same names as the troff
 * special character names (for now at least) and each one defines a PostScript
 * procedure that begins with the prefix build_ and ends with the character's
 * name.
 *
 * For example, the routine used to build character \(12, would be build_12.
 * downloaded[] points to an array, allocated in fontinit(), that keeps track of
 * the characters that have already been defined - so we only do it once.
 *
 */


char		*downloaded;		/* nonzero means it's been downloaded */


/*
 *
 * Variables that keep track of troff's requests. All are set from values in the
 * input files. nfonts is adjusted in t_fp() as new fonts are mounted.
 *
 */


int		nfonts = 0;		/* number of font positions */
int		size = 1;		/* current size - internal value */
int		font = 0;		/* font position we're using now */
int		hpos = 0;		/* where troff wants to be - horizontally */
int		vpos = 0;		/* same but vertically */
float		lastw = 0;		/* width of the last input character */
int		lastc = 0;		/* and its name (or index) */

int		fontheight = 0;		/* points from x H ... */
int		fontslant = 0;		/* angle from x S ... */

int		res;			/* resolution assumed in input file */
float		widthfac = 1.0;		/* for emulation = res/dev.res */


/*
 *
 * Remember some of the same things, but this time for the printer. lastend is only
 * used when we're doing reverse video, and is where the last character on the
 * current line was printed.
 *
 */


int		lastsize = -1;		/* last internal size we used */
int		lastfont = -1;		/* last font we told printer about */
float		lastx = -1;		/* printer's current position */
int		lasty = -1;
int		lastend;		/* where last character on this line was */


/*
 *
 * fontname[] keeps track of the mounted fonts. Filled in (by t_fp()) from data
 * in the binary font files.
 *
 */


struct  {

	char	*name;			/* name of the font loaded here */
	int	number;			/* its internal number */

} fontname[NFONT+1] = {NULL, 0};


/*
 *
 * All the special fonts will be mounted after the last legitimate font position.
 * It helps when we're translating files prepared for devices, like the 202, that
 * have a different set of special fonts. The set of special fonts needed when
 * *realdev's tables are used may not get mounted when we're emulating another
 * device. gotspecial keeps track of whether we've done it yet. seenpage is set
 * to TRUE after we've seen the first page command in the input file. It controls
 * what's done in t_font() and is needed because nfonts is no longer set when the
 * DESC.out file is read, but rather is updated from "x font" commands in the
 * input files.
 *
 */


int		gotspecial = FALSE;
int		seenpage = FALSE;


/*
 *
 * The amount of horizontal positioning error we accept controls both the size
 * of the output file and the appearance of the printed text. It's probably most
 * important when we're emulating other devices, like the APS-5. The error can be
 * set using the -S option. It's converted from points to machine units in t_init()
 * after the resolution is known. rvslop is also set in t_init() and only used to
 * adjust the width of the box that's drawn around text when we're printing in
 * reverse video mode.
 *
 */


float		pointslop = SLOP;	/* horizontal error in points */
int		slop;			/* and machine units */
int		rvslop;			/* to extend box in reverse video mode */


/*
 *
 * Characters are accumulated and saved in PostScript strings that are eventually
 * processed by making a single call to procedure t. textcount counts the number
 * of individual strings collected but not yet processed, and is primarily used to
 * make sure PostScript's stack doesn't get too big. When textcount is positive
 * we've started accumulating strings and need to generate a call to PostScript
 * procedure t to process the text before anything else (like a font change) is
 * done.
 *
 */


int		textcount = 0;		/* strings accumulated so far */
int		stringstart = 0;	/* where the next one starts */
int		spacecount = 0;		/* spaces seen so far on current line */


/*
 *
 * Things that can be used by text line encoding schemes that need to read and
 * remember an entire line before doing any output. The strings that make up the
 * line can be saved in array strings[] and accessed by fields in line[]. *strptr
 * points to the next free slot in strings[].
 *
 */


char		strings[STRINGSPACE];
char		*strptr;
Line		line[MAXSTACK+3];


/*
 *
 * When we're emulating another device we may want to map font name requests that
 * come in as "x font pos name" commands into some other font name before anything
 * else is done (ie. calling loadfont()). Font names can collide or we may just
 * want to a mapping that depends on the device troff used to format the input
 * files. devfontmap points to a structure that's filled in by getdevmap() if the
 * mapping file /usr/lib/font/dev*realdev/fontmaps/devname exists. mapdevfont()
 * then uses that table to translate font name requests into something else before
 * loadfont() gets called.
 *
 * fontmap[] provides a simple minded translation that maps an unrecognized font
 * name (in loadfont()) into another font name that we know will be available. It
 * doesn't provide the fine control available with *devfontmap, but should be good
 * enough for most jobs. Both structures are only needed when emulating another
 * device using *realdev's font tables.
 *
 */


Devfontmap	*devfontmap = NULL;	/* device level */
Fontmap		fontmap[] = FONTMAP;	/* and general mapping tables - emulation */


/*
 *
 * A few variables that are really only used if we're doing accounting. Designed
 * for our use at Murray Hill and probably won't suit your needs. Changes should
 * be easy and can be made in routine account().
 *
 */


int		printed = 0;		/* charge for this many pages */


/*
 *
 * Output and accounting file definitions. The PostScript output always goes to
 * stdout or /dev/null, while the accounting file can be selected using the -A
 * option.
 *
 */


FILE		*tf = NULL;		/* PostScript output goes here */
FILE		*fp_acct = NULL;	/* accounting stuff written here */


/*
 *
 * Need the list of valid options in header() and options(), so I've moved the
 * definition here.
 *
 */


char		*optnames = "a:c:e:m:n:o:p:tw:x:y:A:C:J:F:H:L:OP:R:S:T:DI";


/*
 *
 * Very temporary space that can be used to do things like building up pathnames
 * immediately before opening a file. Contents may not be preserved across calls
 * to subroutines defined in this file, so it probably should only be used in low
 * level subroutines like loadfont() or fontinit() and nowhere else.
 *
 */


char		temp[150];

static void account(void);
static void addchar(int);
static void addoctal(int);
static void arguments(void);
static void charlib(int);
static void conv(FILE *);
static void devcntrl(FILE *);
static void documentfonts(void);
static void done(void);
static void endline(void);
static void endstring(void);
void endtext(void);
static void fontinit(void);
static void fontprint(int);
static void getdevmap(void);
static void header(void);
void hgoto(int);
static void hmot(int);
static void init_signals(void);
static void loaddefault(void);
static void loadfont(int, char *, char *);
static void loadspecial(void);
static void options(void);
static void oput(int);
static void put1(int);
static void put1s(char *);
static void redirect(int);
void reset(void);
void resetpos(void);
static void setfont(int);
static void setpaths(char *);
static void setsize(int);
static void setup(void);
static void starttext(void);
static void t_charht(int);
static void t_fp(int, char *, char *);
static void t_init(void);
static void t_newline(void);
static void t_page(int);
static void t_reset(int);
void t_sf(void);
static void t_slant(int);
static void t_trailer(void);
void vgoto(int);
static void vmot(int);


/*****************************************************************************/


int
main(int agc, char *agv[])
{

/*
 *
 * A program that translates troff output into PostScript. All the input files
 * must have been formatted for the same device, which doesn't necessarily have to
 * be *realdev. If there's more than one input file, each begins on a new page.
 *
 */


    argc = agc;				/* global so everyone can use them */
    argv = agv;

    prog_name = argv[0];		/* just for error messages */

    init_signals();			/* sets up interrupt handling */
    header();				/* PostScript file structuring comments */
    options();				/* command line options */
    arguments();			/* translate all the input files */
    done();				/* add trailing comments etc. */
    account();				/* job accounting data */

    return (x_stat);			/* everything probably went OK */

}   /* End of main */


/*****************************************************************************/


static void
init_signals(void)
{
    void	interrupt();		/* signal handler */

/*
 *
 * Make sure we handle interrupts.
 *
 */


    if ( signal(SIGINT, interrupt) == SIG_IGN )  {
	signal(SIGINT, SIG_IGN);
	signal(SIGQUIT, SIG_IGN);
	signal(SIGHUP, SIG_IGN);
    } else {
	signal(SIGHUP, interrupt);
	signal(SIGQUIT, interrupt);
    }   /* End else */

    signal(SIGTERM, interrupt);

}   /* End of init_signals */


/*****************************************************************************/

static void
header(void)
{


    int		ch;			/* return value from getopt() */
    int		old_optind = optind;	/* for restoring optind - should be 1 */


/*
 *
 * Scans the option list looking for things, like the prologue file, that we need
 * right away but could be changed from the default. Doing things this way is an
 * attempt to conform to Adobe's latest file structuring conventions. In particular
 * they now say there should be nothing executed in the prologue, and they have
 * added two new comments that delimit global initialization calls. Once we know
 * where things really are we write out the job header, follow it by the prologue,
 * and then add the ENDPROLOG and BEGINSETUP comments.
 *
 */


    while ( (ch = getopt(argc, argv, optnames)) != EOF )
	if ( ch == 'L' )
	    setpaths(optarg);
	else if ( ch == '?' )
	    error(FATAL, "");

    optind = old_optind;		/* get ready for option scanning */

    fprintf(stdout, "%s", NONCONFORMING);
    fprintf(stdout, "%s %s\n", VERSION, PROGRAMVERSION);
    fprintf(stdout, "%s %s\n", DOCUMENTFONTS, ATEND);
    fprintf(stdout, "%s %s\n", PAGES, ATEND);
    fprintf(stdout, "%s", ENDCOMMENTS);

    if ( cat(prologue) == FALSE )
	error(FATAL, "can't read %s", prologue);

    fprintf(stdout, "%s", ENDPROLOG);
    fprintf(stdout, "%s", BEGINSETUP);
    fprintf(stdout, "mark\n");

}   /* End of header */


/*****************************************************************************/


static void
options(void)
{
    int		ch;			/* name returned by getopt() */

    extern char	*optarg;		/* option argument set by getopt() */
    extern int	optind;

/*
 *
 * Reads and processes the command line options. There are, without a doubt, too
 * many options!
 *
 */


    while ( (ch = getopt(argc, argv, optnames)) != EOF )  {

	switch ( ch )  {

	    case 'a':			/* aspect ratio */
		    fprintf(stdout, "/aspectratio %s def\n", optarg);
		    break;

	    case 'c':			/* number of copies */
		    copies = atoi(optarg);
		    fprintf(stdout, "/#copies %s store\n", optarg);
		    break;

	    case 'e':			/* change the encoding scheme */
		    if ( (encoding = atoi(optarg)) < 0 || encoding > MAXENCODING )
			encoding = DFLTENCODING;
		    realencoding = encoding;
		    break;

	    case 'm':			/* magnification */
		    fprintf(stdout, "/magnification %s def\n", optarg);
		    break;

	    case 'n':			/* forms per page */
		    formsperpage = atoi(optarg);
		    fprintf(stdout, "%s %s\n", FORMSPERPAGE, optarg);
		    fprintf(stdout, "/formsperpage %s def\n", optarg);
		    break;

	    case 'o':			/* output page list */
		    out_list(optarg);
		    break;

	    case 'p':			/* landscape or portrait mode */
		    if ( *optarg == 'l' )
			fprintf(stdout, "/landscape true def\n");
		    else fprintf(stdout, "/landscape false def\n");
		    break;

	    case 't':			/* just for compatibility */
		    break;

	    case 'w':			/* line width for drawing */
		    fprintf(stdout, "/linewidth %s def\n", optarg);
		    break;

	    case 'x':			/* shift horizontally */
		    fprintf(stdout, "/xoffset %s def\n", optarg);
		    break;

	    case 'y':			/* and vertically on the page */
		    fprintf(stdout, "/yoffset %s def\n", optarg);
		    break;

	    case 'A':			/* force job accounting */
	    case 'J':
		    if ( (fp_acct = fopen(optarg, "a")) == NULL )
			error(FATAL, "can't open accounting file %s", optarg);
		    break;

	    case 'C':			/* copy file to straight to output */
		    if ( cat(optarg) == FALSE )
			error(FATAL, "can't read %s", optarg);
		    break;

	    case 'F':			/* font table directory */
		    fontdir = optarg;
		    break;

	    case 'H':			/* host resident font directory */
		    hostfontdir = optarg;
		    break;

	    case 'L':			/* PostScript prologue file */
		    setpaths(optarg);	/* already been done in header() */
		    break;

	    case 'O':			/* turn picture inclusion off */
		    picflag = OFF;
		    break;

	    case 'P':			/* PostScript pass through */
		    fprintf(stdout, "%s\n", optarg);
		    break;

	    case 'R':			/* special global or page level request */
		    saverequest(optarg);
		    break;

	    case 'S':			/* horizontal position error */
		    if ( (pointslop = atof(optarg)) < 0 )
			pointslop = 0;
		    break;

	    case 'T':			/* target printer */
		    realdev = optarg;
		    break;

	    case 'D':			/* debug flag */
		    debug = ON;
		    tf = stdout;
		    break;

	    case 'I':			/* ignore FATAL errors */
		    ignore = ON;
		    break;

	    case '?':			/* don't know the option */
		    error(FATAL, "");
		    break;

	    default:
		    error(FATAL, "missing case for option %c", ch);
		    break;

	}   /* End switch */
    }	/* End while */

    argc -= optind;			/* get ready for non-options args */
    argv += optind;

}   /* End of options */


/*****************************************************************************/


static void
setpaths(char *name)
    /* string that followed the -L option */
{
    char	*path;			/* start of the pathname */

/*
 *
 * Extends the -L option to permit run time modification of pathnames that were
 * fixed or didn't exist in previous versions of dpost. For example, the PostScript
 * drawing procedures have been moved out of *prologue and put in *drawfile. The
 * new syntax can be either -Lfile or -Lname:file. If the "name:" prefix is omitted
 * file will be used as the prologue, otherwise name should be one of "prologue",
 * "font", "draw", "color", or "form" and is used to select the pointer that gets
 * set to string "file".
 *
 */


    for ( path = name; *path; path++ )
	if ( *path == ':' || *path == ' ' )  {
	    while ( *path == ':' || *path == ' ' ) path++;
	    break;
	}   /* End if */

    if ( *path == '\0' )		/* didn't find a "name:" prefix */
	path = name;

    if ( path == name || strncmp(name, "prologue", strlen("prologue")) == 0 )
	prologue = path;
    else if ( strncmp(name, "draw", strlen("draw")) == 0 )
	drawfile = path;
    else if ( strncmp(name, "color", strlen("color")) == 0 )
	colorfile = path;
    else if ( strncmp(name, "form", strlen("form")) == 0 )
	formfile = path;
    else if ( strncmp(name, "baseline", strlen("baseline")) == 0 )
	baselinefile = path;

}   /* End of setpaths */


/*****************************************************************************/


static void
setup(void)
{

/*
 * Handles things that must be done after the options are read but before the
 * input files are processed. Called from t_init() after an "x init" command is
 * read, because we need the resolution before we can generate the call to the
 * setup procedure defined in *prologue. Only allowing one call to setup assumes
 * all the input files have been prepared for the same device.
 *
 */


    writerequest(0, stdout);		/* global requests eg. manual feed */
    fprintf(stdout, "/resolution %d def\n", res);
    fprintf(stdout, "setup\n");
    fprintf(stdout, "%d setdecoding\n", encoding);

    if ( formsperpage > 1 )  {		/* followed by stuff for multiple pages */
	if ( cat(formfile) == FALSE )
	    error(FATAL, "can't read %s", formfile);
	fprintf(stdout, "%d setupforms\n", formsperpage);
    }	/* End if */

    fprintf(stdout, "%s", ENDSETUP);

}   /* End of setup */


/*****************************************************************************/


static void
arguments(void)
{
    FILE	*fp;			/* next input file */

/*
 *
 * Makes sure all the non-option command line arguments are processed. If we get
 * here and there aren't any arguments left, or if '-' is one of the input files
 * we'll translate stdin.
 *
 */


    if ( argc < 1 )
	conv(stdin);
    else
	while ( argc > 0 ) {
	    if ( strcmp(*argv, "-") == 0 )
		fp = stdin;
	    else if ( (fp = fopen(*argv, "r")) == NULL )
		error(FATAL, "can't open %s", *argv);
	    conv(fp);
	    if ( fp != stdin )
		fclose(fp);
	    argc--;
	    argv++;
	}   /* End while */

}   /* End of arguments */


/*****************************************************************************/


static void
done(void)
{

/*
 *
 * Finished with all the input files, so mark the end of the pages with a TRAILER
 * comment, make sure the last page prints, and add things like the DOCUMENTFONTS
 * and PAGES comments that can only be determined after all the input files have
 * been read.
 *
 */


    fprintf(stdout, "%s", TRAILER);
    fprintf(stdout, "done\n");

    if ( temp_file != NULL )  {
	if ( docfonts > 0 )  {
	    cat(temp_file);
	    putc('\n', stdout);
	}   /* End if */
	unlink(temp_file);
    }	/* End if */

    fprintf(stdout, "%s %d\n", PAGES, printed);

}   /* End of done */


/*****************************************************************************/


static void
account(void)
{

/*
 *
 * Writes an accounting record to *fp_acct provided it's not NULL. Accounting is
 * requested using the -A or -J options.
 *
 */

    if ( fp_acct != NULL )
	fprintf(fp_acct, " print %d\n copies %d\n", printed, copies);

}   /* End of account */


/*****************************************************************************/


static void
conv(FILE *fp)
    /* next input file */
{
    int			c;		/* usually first char in next command */
    int			m, n, n1, m1;	/* when we need to read integers */
    char		str[50];	/* for special chars and font numbers */


/*
 *
 * Controls the translation of troff's device independent output language into
 * PostScript. The call to t_page() that prints the last page is made when we
 * exit the loop, but probably belongs in t_trailer().
 *
 */


    redirect(-1);			/* only do output after a page command */
    lineno = 1;				/* line in current file */

    while ((c = getc(fp)) != EOF)  {

	switch (c)  {

	    case '\n':			/* just count this line */
		    lineno++;
		    break;

	    case ' ':			/* when input is text */
	    case 0:			/* occasional noise creeps in */
		    break;

	    case '0': case '1': case '2': case '3': case '4':
	    case '5': case '6': case '7': case '8': case '9':
		    /* two motion digits plus a character */
		    hmot((c-'0')*10 + getc(fp)-'0');
		    put1(getc(fp));
		    break;

	    case 'c':			/* single ascii character */
		    put1(getc(fp));
		    break;

	    case 'C':			/* special character */
		    fscanf(fp, "%s", str);
		    put1s(str);
		    break;

	    case 'N':			/* character at position n */
		    fscanf(fp, "%d", &m);
		    endtext();
		    oput(m);
		    break;

	    case 'D':			/* drawing functions */
		    endtext();
		    getdraw();
		    if ( size != lastsize )
			t_sf();
		    switch ((c=getc(fp))) {
			case 'p':	/* draw a path */
			    while (fscanf(fp, "%d %d", &n, &m) == 2)
				drawline(n, m);
			    lineno++;
			    break;

			case 'l':	/* draw a line */
			    fscanf(fp, "%d %d %c", &n, &m, &n1);
			    drawline(n, m);
			    break;

			case 'c':	/* circle */
			    fscanf(fp, "%d", &n);
			    drawcirc(n);
			    break;

			case 'e':	/* ellipse */
			    fscanf(fp, "%d %d", &m, &n);
			    drawellip(m, n);
			    break;

			case 'a':	/* counter-clockwise arc */
			case 'A':	/* clockwise arc */
			    fscanf(fp, "%d %d %d %d", &n, &m, &n1, &m1);
			    drawarc(n, m, n1, m1, c);
			    break;

			case 'q':	/* spline without end points */
			    drawspline(fp, 1);
			    lineno++;
			    break;

			case '~':	/* wiggly line */
			    drawspline(fp, 2);
			    lineno++;
			    break;

			default:
			    error(FATAL, "unknown drawing function %c", c);
			    break;
		    }	/* End switch */
		    break;

	    case 's':			/* use this point size */
		    fscanf(fp, "%d", &n);	/* ignore fractional sizes */
		    setsize(t_size(n));
		    break;

	    case 'f':			/* use font mounted here */
		    fscanf(fp, "%s", str);
		    setfont(t_font(str));
		    break;

	    case 'H':			/* absolute horizontal motion */
		    fscanf(fp, "%d", &n);
		    hgoto(n);
		    break;

	    case 'h':			/* relative horizontal motion */
		    fscanf(fp, "%d", &n);
		    hmot(n);
		    break;

	    case 'w':			/* word space */
		    break;

	    case 'V':			/* absolute vertical position */
		    fscanf(fp, "%d", &n);
		    vgoto(n);
		    break;

	    case 'v':			/* relative vertical motion */
		    fscanf(fp, "%d", &n);
		    vmot(n);
		    break;

	    case 'p':			/* new page */
		    fscanf(fp, "%d", &n);
		    t_page(n);
		    break;

	    case 'n':			/* end of line */
		    while ( (c = getc(fp)) != '\n'  &&  c != EOF ) ;
		    t_newline();
		    lineno++;
		    break;

	    case '#':			/* comment */
		    while ( (c = getc(fp)) != '\n'  &&  c != EOF ) ;
		    lineno++;
		    break;

	    case 'x':			/* device control function */
		    devcntrl(fp);
		    lineno++;
		    break;

	    default:
		    error(FATAL, "unknown input character %o %c", c, c);
		    done();

	}   /* End switch */

    }	/* End while */

    t_page(-1);				/* print the last page */
    endtext();

}   /* End of conv */


/*****************************************************************************/


static void
devcntrl(FILE *fp)
    /* current input file */
{


    char	str[50], buf[256], str1[50];
    int		c, n;


/*
 *
 * Called from conv() to process the rest of a device control function. There's
 * a whole family of them and they all start with the string "x ", which we've
 * already read. The "x X ..." commands are an extensible (and device dependent)
 * family that we use here for things like picture inclusion. Unrecognized device
 * control commands are ignored.
 *
 */


    fscanf(fp, "%s", str);		/* get the control function name */

    switch ( str[0] )  {		/* only the first character counts */

	case 'i':			/* initialize */
		t_init();
		break;

	case 'T':			/* device name */
		fscanf(fp, "%s", devname);
		getdevmap();
		strcpy(devname, realdev);
		break;

	case 't':			/* trailer */
		t_trailer();
		break;

	case 'p':			/* pause -- can restart */
		t_reset('p');
		break;

	case 's':			/* stop */
		t_reset('s');
		break;

	case 'r':			/* resolution assumed when prepared */
		fscanf(fp, "%d", &res);
		break;

	case 'f':			/* load font in a position */
		fscanf(fp, "%d %s", &n, str);
		fgets(buf, sizeof buf, fp);	/* in case there's a filename */
		ungetc('\n', fp);	/* fgets() goes too far */
		str1[0] = '\0';		/* in case there's nothing to come in */
		sscanf(buf, "%s", str1);
		loadfont(n, mapdevfont(str), str1);
		break;

	/* these don't belong here... */
	case 'H':			/* char height */
		fscanf(fp, "%d", &n);
		t_charht(n);
		break;

	case 'S':			/* slant */
		fscanf(fp, "%d", &n);
		t_slant(n);
		break;

	case 'X':			/* copy through - from troff */
		fscanf(fp, " %[^: \n]:", str);
		fgets(buf, sizeof(buf), fp);
		ungetc('\n', fp);
		if ( strcmp(str, "PI") == 0 || strcmp(str, "PictureInclusion") == 0 )
		    picture(buf);
		else if ( strcmp(str, "InlinePicture") == 0 )
		    inlinepic(fp, buf);
		else if ( strcmp(str, "BeginPath") == 0 )
		    beginpath(buf, FALSE);
		else if ( strcmp(str, "DrawPath") == 0 )
		    drawpath(buf, FALSE);
		else if ( strcmp(str, "BeginObject") == 0 )
		    beginpath(buf, TRUE);
		else if ( strcmp(str, "EndObject") == 0 )
		    drawpath(buf, TRUE);
		else if ( strcmp(str, "NewBaseline") == 0 )
		    newbaseline(buf);
		else if ( strcmp(str, "DrawText") == 0 )
		    drawtext(buf);
		else if ( strcmp(str, "SetText") == 0 )
		    settext(buf);
		else if ( strcmp(str, "SetColor") == 0 )  {
		    newcolor(buf);
		    setcolor();
		} else if ( strcmp(str, "PS") == 0 || strcmp(str, "PostScript") == 0 )  {
		    endtext();
		    /* xymove(hpos, vpos); ul90-22006 */
		    fprintf(tf, "%s", buf);
		}   /* End else */
		break;
    }	/* End switch */

    while ( (c = getc(fp)) != '\n'  &&  c != EOF ) ;

}   /* End of devcntrl */


/*****************************************************************************/


static void
fontinit(void)
{
    int		fin;			/* for reading the DESC.out file */
    char	*filebase;		/* the whole thing goes here */
    int		i;			/* loop index */


/*
 *
 * Reads *realdev's DESC.out file and uses what's there to initialize things like
 * the list of available point sizes. Old versions of the program used *devname's
 * DESC.out file to initialize nfonts, but that meant we needed to have *devname's
 * binary font files available for emulation. That restriction has been removed
 * and we now set nfonts using the "x font" commands in the input file, so by the
 * time we get here all we really need is *realdev. In fact devcntrl() reads the
 * device name from the "x T ..." command, but almost immediately replaces it with
 * string *realdev so we end up using *realdev's DESC.out file. Later on (in
 * t_font()) we mount all of *realdev's special fonts after the last legitimate
 * font position, just to be sure device emulation works reasonably well - there's
 * no guarantee *devname's special fonts match what's needed when *realdev's tables
 * are used.
 *
 */


    sprintf(temp, "%s/dev%s/DESC.out", fontdir, devname);
    if ( (fin = open(temp, 0)) < 0 )
	error(FATAL, "can't open tables for %s", temp);

    read(fin, &dev, sizeof(struct dev));

    nfonts = 0;				/* was dev.nfonts - now set in t_fp() */
    nsizes = dev.nsizes;
    nchtab = dev.nchtab;
    unitwidth = dev.unitwidth;

    if ( (filebase = malloc(dev.filesize)) == NULL )
	error(FATAL, "no memory for description file");

    read(fin, filebase, dev.filesize);	/* all at once */
    close(fin);

    pstab = (short *) filebase;
    chtab = pstab + nsizes + 1;
    chname = (char *) (chtab + nchtab);
    fsize = 3 * 255 + nchtab + 128 - 32 + sizeof(struct Font);

    for ( i = 1; i <= NFONT; i++ )  {	/* so loadfont() knows nothing's there */
	fontbase[i] = NULL;
	widthtab[i] = codetab[i] = fitab[i] = NULL;
    }	/* End for */

    if ( (downloaded = (char *) calloc(nchtab + 128, sizeof(char))) == NULL )
	error(FATAL, "no memory");

}   /* End of fontinit */


/*****************************************************************************/


static void
loadfont(int n, char *s, char *s1)
    /* n - load this font position */
    /* s - with the .out file for this font */
    /* s1 - taken from here - possibly */
{
    int		fin;			/* for reading *s.out file */
    int		nw;			/* number of width table entries */


/*
 *
 * Loads font position n with the binary font file for *s.out provided it's not
 * already there. If *s1 is NULL or points to the empty string we read files from
 * directory *fontdir/dev*devname, otherwise directory *s1 is used. If the first
 * open fails we try to map font *s into one we expect will be available, and then
 * we try again.
 *
 */


    if ( n < 0  ||  n > NFONT )		/* make sure it's a legal position */
	error(FATAL, "illegal fp command %d %s", n, s);

    if ( fontbase[n] != NULL && strcmp(s, fontbase[n]->namefont) == 0 )
	return;

    if ( s1 == NULL || s1[0] == '\0' )
	sprintf(temp, "%s/dev%s/%s.out", fontdir, devname, s);
    else sprintf(temp, "%s/%s.out", s1, s);

    if ( (fin = open(temp, 0)) < 0 )  {
	sprintf(temp, "%s/dev%s/%s.out", fontdir, devname, mapfont(s));
	if ( (fin = open(temp, 0)) < 0 )
	    error(FATAL, "can't open font table %s", temp);
    }	/* End if */

    if ( fontbase[n] != NULL )		/* something's already there */
	free(fontbase[n]);		/* so release the memory first */

    fontbase[n] = (struct Font *) malloc(fsize);
    if ( fontbase[n] == NULL )
	error(FATAL, "Out of space in loadfont %s", s);

    read(fin, fontbase[n], fsize);
    close(fin);

    if ( smnt == 0 && fontbase[n]->specfont == 1 )
	smnt = n;

    nw = fontbase[n]->nwfont & BMASK;
    widthtab[n] = (char *) fontbase[n] + sizeof(struct Font);
    codetab[n] = (char *) widthtab[n] + 2 * nw;
    fitab[n] = (char *) widthtab[n] + 3 * nw;

    t_fp(n, fontbase[n]->namefont, fontbase[n]->intname);

    if ( debug == ON )
	fontprint(n);

}   /* End of loadfont */


/*****************************************************************************/


static void
loadspecial(void)
{
    char	*p;			/* for next binary font file */
    int		nw;			/* width entries in next font */
    int		i;			/* loop index */


/*
 *
 * Loads all the special fonts after the last legal font position. Mostly used
 * for device emulation, but we'll do it no matter what. Needed because there's
 * no consistency in special fonts across different devices, and relying on having
 * them mounted in the input file doesn't guarantee the whole collection will be
 * there. The special fonts are determined and mounted using the copy of the
 * DESC.out file that's been read into memory. Initially had this stuff at the
 * end of fontinit(), but we now don't know nfonts until much later.
 *
 */


    if ( gotspecial == FALSE )
	for ( i = 1, p = chname + dev.lchname; i <= dev.nfonts; i++ )  {
	    nw = *p & BMASK;
	    if ( ((struct Font *) p)->specfont == 1 )
		loadfont(++nfonts, ((struct Font *)p)->namefont, NULL);
	    p += 3 * nw + dev.nchtab + 128 - 32 + sizeof(struct Font);
	}   /* End for */

    gotspecial = TRUE;

}   /* End of loadspecial */


/*****************************************************************************/
char *defaultFonts[] =
	{ "R", "I", "B", "BI", "CW", "H", "HB", "HX", "S1", "S", NULL };

static void
loaddefault(void)
{
  int i;

  for (i = 0; defaultFonts[i] != NULL ; i++)
    loadfont(++nfonts, defaultFonts[i], NULL);
}


static void
fontprint(int i)
    /* font's index in fontbase[] */
{
    int		j, n;
    char	*p;


/*
 *
 * Debugging routine that dumps data about the font mounted in position i.
 *
 */


    fprintf(tf, "font %d:\n", i);

    p = (char *) fontbase[i];
    n = fontbase[i]->nwfont & BMASK;

    fprintf(tf, "base=0%o, nchars=%d, spec=%d, name=%s, widtab=0%o, fitab=0%o\n",
	    p, n, fontbase[i]->specfont, fontbase[i]->namefont, widthtab[i], fitab[i]);

    fprintf(tf, "widths:\n");
    for ( j = 0; j <= n; j++ )  {
	fprintf(tf, " %2d", widthtab[i][j] & BMASK);
	if ( j % 20 == 19 ) putc('\n', tf);
    }	/* End for */

    fprintf(tf, "\ncodetab:\n");
    for ( j = 0; j <= n; j++ )  {
	fprintf(tf, " %2d", codetab[i][j] & BMASK);
	if ( j % 20 == 19 ) putc('\n', tf);
    }	/* End for */

    fprintf(tf, "\nfitab:\n");
    for ( j = 0; j <= dev.nchtab + 128-32; j++ )  {
	fprintf(tf, " %2d", fitab[i][j] & BMASK);
	if ( j % 20 == 19 ) putc('\n', tf);
    }	/* End for */

    putc('\n', tf);

}   /* End of fontprint */


/*****************************************************************************/


char *
mapfont(char *name)
    /* troff wanted this font */
{
    int		i;			/* loop index */


/*
 *
 * If loadfont() can't find font *name we map it into something else that should
 * be available and return a pointer to the new name. Used mostly for emulating
 * devices like the APS-5.
 *
 */


    for ( i = 0; fontmap[i].name != NULL; i++ )
	if ( strcmp(name, fontmap[i].name) == 0 )
	    return(fontmap[i].use);

    switch ( *++name )  {
	case 'I':
		return("I");

	case 'B':
		return("B");

	case 'X':
		return("BI");

	default:
		return("R");
    }	/* End switch */

}   /* End of mapfont */


/*****************************************************************************/


static void
getdevmap(void)
{


    FILE	*fp;			/* for reading the device fontmap file */
    int		i = 0;			/* number of mapping pairs we've read */
    int		c;			/* for skipping lines */


/*
 *
 * Looks for the device font mapping file *fontdir/dev*realdev/fontmaps/devname.
 * The file, if it exists, should be an ASCII file containing pairs of one or two
 * character font names per line. The first name is the font troff will be asking
 * for and the second is the one we'll use. Comments are lines that begin with
 * a '#' as the first non-white space character on a line. The devfontmap list
 * ends with a member that has the empty string in the name field.
 *
 */


    sprintf(temp, "%s/dev%s/fontmaps/%s", fontdir, realdev, devname);

    if ( devfontmap == NULL && (fp = fopen(temp, "r")) != NULL )  {
	devfontmap = (Devfontmap *) malloc(10 * sizeof(Devfontmap));

	while ( fscanf(fp, "%s", temp) != EOF )  {
	    if ( temp[0] != '#' && strlen(temp) < 3 )
		if ( fscanf(fp, "%s", &temp[3]) == 1 && strlen(&temp[3]) < 3 )  {
		    strcpy((devfontmap + i)->name, temp);
		    strcpy((devfontmap + i)->use, &temp[3]);
		    if ( ++i % 10 == 0 )
			devfontmap = (Devfontmap *) realloc(devfontmap, (i + 10) * sizeof(Devfontmap));
		}   /* End if */
	    while ( (c = getc(fp)) != '\n' && c != EOF ) ;
	}   /* End while */

	(devfontmap + i)->name[0] = '\0';	/* end the list we just read */
	fclose(fp);
    }	/* End if */

}   /* End of getdevmap */


/*****************************************************************************/


char *
mapdevfont(char *str)
{
    int		i;


/*
 *
 * Called immediately before loadfont() after an 'x font' command is recognized.
 * Takes the font name that troff asked for, looks it up in the devfontmap list,
 * and returns the mapped name to the caller. No mapping is done if the devfontmap
 * list is empty or font *str isn't found in the list.
 *
 */


    if ( devfontmap != NULL )
	for ( i = 0; (devfontmap + i)->name[0] != '\0'; i++ )
	    if ( strcmp((devfontmap + i)->name, str) == 0 )
		return((devfontmap + i)->use);

    return(str);

}   /* End of mapdevfont */


/*****************************************************************************/


void
reset(void)
{

/*
 *
 * Resets the variables that keep track of the printer's current position, font,
 * and size. Typically used after a restore/save pair (eg. when we finish with a
 * page) to make sure we force the printer back into sync (in terms of the font
 * and current point) before text is printed.
 *
 */


    lastx = -(slop + 1);
    lasty = -1;
    lastfont = lastsize = -1;

}   /* End of reset */


/*****************************************************************************/


void
resetpos(void)
{


/*
 *
 * Resets the variables that keep track of the printer's current position. Used
 * when there's a chance we've lost track of the printer's current position or
 * done something that may have wiped it out, and we want to force dpost to set
 * the printer's position before printing text or whatever. For example stroke or
 * fill implicitly do a newpath, and that wipes out the current point, unless the
 * calls were bracketed by a gsave/grestore pair.
 *
 */


    lastx = -(slop + 1);
    lasty = -1;

}   /* End of resetpos */


/*****************************************************************************/


static void
t_init(void)
{
    static int	initialized = FALSE;	/* only do most things once */


/*
 *
 * Called from devcntrl() after an "x init" command is read. Things only work if
 * we've already seen the "x res" command, and much of the stuff, including the
 * call to setup, should only be done once. Restricting everything to one call of
 * setup (ie. the one in the prologue) means all the input files must have been
 * formatted for the same device.
 *
 */


    endtext();				/* moved  - for cat'ed troff files */

    if ( initialized == FALSE )  {	/* only do this stuff once per job */
	fontinit();
	gotspecial = FALSE;
	widthfac = (float) res /dev.res;
	slop = pointslop * res / POINTS + .5;
	rvslop = res * .025;
	setup();
	initialized = TRUE;
    }	/* End if */

    hpos = vpos = 0;			/* upper left corner */
    setsize(t_size(10));		/* start somewhere */
    reset();				/* force position and font stuff - later */

}   /* End of t_init */


/*****************************************************************************/


static void
t_page(int pg)
    /* troff's current page number */
{
    static int	lastpg = 0;		/* last one we started - for ENDPAGE */


/*
 *
 * Called whenever we've finished the last page and want to get ready for the
 * next one. Also used at the end of each input file, so we have to be careful
 * about what's done. The first time through (up to the redirect(pg) call) output
 * goes to /dev/null because of the redirect(-1) call made in conv().
 *
 * Adobe now recommends that the showpage operator occur after the page level
 * restore so it can be easily redefined to have side-effects in the printer's VM.
 * Although it seems reasonable I haven't implemented it, because it makes other
 * things, like selectively setting manual feed or choosing an alternate paper
 * tray, clumsy - at least on a per page basis.
 *
 */


    if ( tf == stdout )			/* count the last page */
	printed++;

    endtext();				/* print the last line? */

    fprintf(tf, "cleartomark\n");
    fprintf(tf, "showpage\n");
    fprintf(tf, "restore\n");
    fprintf(tf, "%s %d %d\n", ENDPAGE, lastpg, printed);

    redirect(pg);

    fprintf(tf, "%s %d %d\n", PAGE, pg, printed+1);
    fprintf(tf, "save\n");
    fprintf(tf, "mark\n");
    writerequest(printed+1, tf);
    fprintf(tf, "%d pagesetup\n", printed+1);
    setcolor();

    lastpg = pg;			/* for the next ENDPAGE comment */
    hpos = vpos = 0;			/* get ready for the next page */
    reset();				/* force position and font stuff - later */

    seenpage = TRUE;

}   /* End of t_page */


/*****************************************************************************/


static void
t_newline(void)
{


/*
 *
 * Just finished the last line. All we do is set the horizontal position to 0,
 * although even that probably isn't necessary.
 *
 */


    hpos = 0;

}   /* End of t_newline */


/*****************************************************************************/


int
t_size(int n)
    /* convert this to an internal size */
{
    int		i;			/* loop index */


/*
 *
 * Converts a point size into an internal size that can be used as an index into
 * pstab[]. The internal size is one plus the index of the least upper bound of
 * n in pstab[], or nsizes if n is larger than all the listed sizes.
 *
 */


    if ( n <= pstab[0] )
	return(1);
    else if (n >= pstab[nsizes-1])
	return(nsizes);

    for ( i = 0; n > pstab[i]; i++ ) ;

    return(i+1);

}   /* End of t_size */


/*****************************************************************************/


static void
setsize(int n)
    /* new internal size */
{


/*
 *
 * Now using internal size n, where pstab[n-1] is the best available approximation
 * to the size troff asked for.
 *
 */


    size = n;

}   /* End of setsize */


/*****************************************************************************/


static void
t_fp(int n, char *s, char *si)
    /* n - this position */
    /* s - now has this font mounted */
    /* si - its internal number */


{


/*
 *
 * Updates nfonts and the array that keeps track of the mounted fonts. Called from
 * loadfont() after an "x font pos font" command is read, and if pos is larger than
 * the current value assigned to nfonts we set gotspecial to FALSE to make sure
 * t_font() loads all the special fonts after the last legitimate font position.
 *
 */


    fontname[n].name = s;
    fontname[n].number = atoi(si);

    if ( n == lastfont )		/* force a call to t_sf() */
	lastfont = -1;

    if ( n > nfonts )  {		/* got more positions */
	nfonts = n;
	gotspecial = FALSE;
    }	/* End if */

}   /* End of t_fp */


/*****************************************************************************/

int
t_font(char *s)
    /* use font in this position next */
{
    int		n;


/*
 *
 * Converts the string *s into an integer and checks to make sure it's a legal
 * font position. Also arranges to mount all the special fonts after the last
 * legitimate font (by calling loadspecial()), provided it hasn't already been
 * done.
 *
 */


    n = atoi(s);

    if ( seenpage == TRUE )  {
	if ( n < 0  ||  n > nfonts )
	    error(FATAL, "illegal font position %d", n);

	if ( gotspecial == FALSE )
	    loadspecial();
    }	/* End if */

    return(n);

}   /* End of t_font */


/*****************************************************************************/


static void
setfont(int n)
    /* use the font mounted here */
{


/*
 *
 * troff wants to use the font that's been mounted in position n. All we do here
 * is update the variable that keeps track of the current position. PostScript
 * font changes are handled in t_sf(), and are only generated right before we're
 * ready to print or draw something.
 *
 */


    if ( n < 0 || n > NFONT )
	error(FATAL, "illegal font %d", n);
    if ( fontname[n].name == NULL && fontname[n].number == 0)
	loaddefault();
    if ( fontname[n].name == NULL && fontname[n].number == 0)
	error(FATAL,
  "font %d not loaded: check 'dpost' input for 'x font %d XXX' before 'f%d'",
		n, n, n);

    font = n;

}   /* End of setfont */


/*****************************************************************************/

void
t_sf(void)
{
    int		fnum;			/* internal font number */


/*
 *
 * Called whenever we need to use a new font or size. Only done right before we
 * print a character. The seenfonts[] array keeps track of the fonts we've used.
 * Helps manage host resident fonts and the DOCUMENTFONTS comment that's put out
 * at the end of the job. The array is indexed by internal number. Only works for
 * fonts that have internal numbers less than or equal to MAXINTERNAL.
 *
 */


    if ( fontname[font].name == NULL )
	return;

    endtext();

    if ( (fnum = fontname[font].number) > MAXINTERNAL || fnum < 0 )
	fnum = 0;

    if ( fnum > 0 && seenfonts[fnum] == 0 && hostfontdir != NULL )  {
	sprintf(temp, "%s/%s", hostfontdir, fontname[font].name);
	if ( access(temp, 04) == 0 )
	    doglobal(temp);
    }	/* End if */

    if ( tf == stdout )  {
	lastfont = font;
	lastsize = size;
	if ( seenfonts[fnum] == 0 )
	    documentfonts();
	seenfonts[fnum] = 1;
    }	/* End if */

    fprintf(tf, "%d %s f\n", pstab[size-1], fontname[font].name);

    if ( fontheight != 0 || fontslant != 0 )
	fprintf(tf, "%d %d changefont\n", fontslant, (fontheight != 0) ? fontheight : pstab[size-1]);

}   /* End of t_sf */


/*****************************************************************************/


static void
t_charht(int n)
    /* use this as the character height */
{

/*
 *
 * Remembers the requested height, from 'x H n'. Forces a call to t_sf(), which
 * is where the real work is done, by setting lastfont to -1.
 *
 */

    fontheight = (n == pstab[size-1]) ? 0 : n;
    lastfont = -1;

}   /* End of t_charht */


/*****************************************************************************/


static void
t_slant(int n)
    /* slant characters this many degrees */
{

/*
 *
 * Remembers the requested slant, from 'x X n'. Forces a call to t_sf(), which
 * is where the real work is done, by setting lastfont to -1.
 *
 */

    fontslant = n;
    lastfont = -1;

}   /* End of t_slant */


/*****************************************************************************/


static void
t_reset(int c)
    /* pause or restart */
{

/*
 *
 * Found an "x stop" or "x pause" command. Although nothing's done here we could
 * add code to reset everything so dpost could handle multiple files formatted for
 * different devices.
 *
 */


}   /* End of t_reset */


/*****************************************************************************/


static void
t_trailer(void)
{

/*
 *
 * Called after we find an "x trailer" in the input file. Forcing out the last
 * page is done at the end of conv(), but probably belongs here.
 *
 */


    endtext();

}   /* End of t_trailer */


/*****************************************************************************/


void
hgoto(int n)
    /* new horizontal position */
{


/*
 *
 * Want to be at this absolute horizontal position next. Actual motion commands
 * are generated in oput(), charlib(), and the drawing routines.
 *
 */


    hpos = n;

}   /* End of hgoto */


/*****************************************************************************/


static void
hmot(int n)
    /* move this far horizontally */
{

/*
 *
 * Handles relative horizontal motion. troff's current positon, as recorded in
 * in hpos, is changed by n units. Usually called right before we're supposed to
 * print a character.
 *
 */


    hpos += n;

}   /* End of hmot */


/*****************************************************************************/


void
vgoto(int n)
    /* new vertical position */
{

/*
 *
 * Moves vertically in troff's coordinate system to absolute position n.
 *
 */


    vpos = n;

}   /* End of vgoto */


/*****************************************************************************/


static void
vmot(int n)
    /* move this far vertically */
{

/*
 *
 * Handles relative vertical motion of n units in troff's coordinate system.
 *
 */


    vpos += n;

}   /* End of vmot */


/*****************************************************************************/


void
xymove(int x, int y)
    /* this is where we want to be */
{

/*
 *
 * Makes sure the post-processor and printer agree about the current position.
 *
 */


    hgoto(x);
    vgoto(y);

    fprintf(tf, "%d %d m\n", hpos, vpos);

    lastx = hpos;
    lasty = vpos;

}   /* End of xymove */


/*****************************************************************************/


static void
put1s(char *s)
    /* find and print this character */
{
    static int		i = 0;		/* last one we found - usually */

/*
 *
 * *s points to the start of a two character string that represents one of troff's
 * special characters. To print it we first look for *s in the chname[] array using
 * chtab[i] to find the string representing character i in chname[]. If the lookup
 * is successful we add 128 to i and ask put1() to finish printing the character.
 * We remember the index where the last character was found because requests to
 * print a special character often come in bunches (eg. drawing lines with \(ru).
 *
 */


    if ( strcmp(s, &chname[chtab[i]]) != 0 )
	for ( i = 0; i < nchtab; i++ )
	    if ( strcmp(&chname[chtab[i]], s) == 0 )
		break;

    if ( i < nchtab )
	put1(i + 128);
    else i = 0;

}   /* End of put1s */


/*****************************************************************************/


static void
put1(int c)
    /* want to print this character */
{

    int			i;		/* character code from fitab */
    int			j;		/* number of fonts we've checked so far */
    int			k;		/* font we're currently looking at */
    char		*pw;		/* font widthtab and */
    char		*p;		/* and codetab where c was found */
    int			code;		/* code used to get c printed */
    int			ofont;		/* font when we started */


/*
 *
 * Arranges to have character c printed. If c < 128 it's a simple ASCII character,
 * otherwise it's a special character. Things done here have to agree with the way
 * the font tables were built by makedev, and work as follows. First we subtract
 * 32 from c because the tables don't record the non-graphic ASCII characters.
 * If fitab[k][c] isn't zero the character is on font k and the value is an index
 * that can be used to recover width and character code data from the other two
 * tables. If fitab[k][c] is zero the character isn't defined on font k and we
 * check the next font, which is found as follows. The current font is the first
 * one we check, and it's followed by a circular search of all the remaining fonts
 * that starts with the first special font and skips font position 0. If character
 * c is found somewhere besides the current font we change to that font and use
 * fitab[k][c] to locate missing data in the other two tables. The width of the
 * character can be found at widthtab[k][c] while codetab[k][c] is whatever we
 * need to tell the printer to have character c printed. lastc records the real
 * name of the character because it's lost by the time oput() gets called but
 * charlib() may need it.
 *
 * Took all the debugging stuff out because at least this part of the program is
 * reasonably solid.
 *
 */


    lastc = c;				/* charlib() needs the name not the code */
    if ( (c -= 32) <= 0 )		/* probably never happens */
	return;

    k = ofont = font;

    if ( (i = fitab[k][c] & BMASK) != 0 )  {	/* it's on this font */
	p = codetab[font];
	pw = widthtab[font];
    } else if ( smnt > 0 )  {		/* on special (we hope) */
	for ( k=smnt, j=0; j <= nfonts; j++, k = (k+1) % (nfonts+1) )  {
	    if ( k == 0 )  continue;
	    if ( (i = fitab[k][c] & BMASK) != 0 )  {
		p = codetab[k];
		pw = widthtab[k];
		setfont(k);
		break;
	    }	/* End if */
	}   /* End for */
    }	/* End else */

    if ( i != 0 && (code = p[i] & BMASK) != 0 )  {
	lastw = widthfac * (((pw[i] & BMASK) * pstab[size-1] + unitwidth/2) / unitwidth);
	oput(code);
    }	/* End if */

    if ( font != ofont )
	setfont(ofont);

}   /* End of put1 */


/*****************************************************************************/


static void
oput(int c)
    /* want to print this character */
{

/*
 *
 * Arranges to print the character whose code is c in the current font. All the
 * actual positioning is done here, in charlib(), or in the drawing routines.
 *
 */


    if ( textcount > MAXSTACK )		/* don't put too much on the stack? */
	endtext();

    if ( font != lastfont || size != lastsize )
	t_sf();

    if ( vpos != lasty )
	endline();

    starttext();

    if ( ABS(hpos - lastx) > slop )
	endstring();

    if ( isascii(c) && isprint(c) )
	switch ( c )  {
	    case '(':
	    case ')':
	    case '\\':
		    addchar('\\');

	    default:
		    addchar(c);
	}   /* End switch */
    else if ( c > 040 )
	addoctal(c);
    else charlib(c);

    lastx += lastw;

}   /* End of oput */


/*****************************************************************************/


static void
starttext(void)
{

/*
 * Called whenever we want to be sure we're ready to start collecting characters
 * for the next call to PostScript procedure t (ie. the one that prints them). If
 * textcount is positive we've already started, so there's nothing to do. The more
 * complicated encoding schemes save text strings in the strings[] array and need
 * detailed information about the strings when they're written to the output file
 * in endtext().
 *
 */


    if ( textcount < 1 )  {
	switch ( encoding )  {
	    case 0:
	    case 1:
		putc('(', tf);
		break;

	    case 2:
	    case 3:
		strptr = strings;
		spacecount = 0;
		line[1].str = strptr;
		line[1].dx = 0;
		line[1].spaces = 0;
		line[1].start = hpos;
		line[1].width = 0;
		break;

	    case MAXENCODING+1:			/* reverse video */
		if ( lastend == -1 )
		    lastend = hpos;
		putc('(', tf);
		break;

	    case MAXENCODING+2:			/* follow a funny baseline */
		putc('(', tf);
		break;
	}   /* End switch */
	textcount = 1;
	lastx = stringstart = hpos;
    }	/* End if */

}   /* End of starttext */


/*****************************************************************************/


void
endtext(void)
{

    int		i;			/* loop index */


/*
 *
 * Generates a call to the PostScript procedure that processes all the text we've
 * accumulated - provided textcount is positive.
 *
 */

    if ( textcount > 0 )  {		/* started working on some text */
	switch ( encoding )  {
	    case 0:
		fprintf(tf, ")%d t\n", stringstart);
		break;

	    case 1:
		fprintf(tf, ")%d %d t\n", stringstart, lasty);
		break;

	    case 2:
		*strptr = '\0';
		line[textcount].width = lastx - line[textcount].start;
		if ( spacecount != 0 || textcount != 1 )  {
		    for ( i = textcount; i > 0; i-- )
			fprintf(tf, "(%s)%d %d", line[i].str, line[i].spaces, line[i].width);
		    fprintf(tf, " %d %d %d t\n", textcount, stringstart, lasty);
		} else fprintf(tf, "(%s)%d %d w\n", line[1].str, stringstart, lasty);
		break;

	    case 3:
		*strptr = '\0';
		if ( spacecount != 0 || textcount != 1 )  {
		    for ( i = textcount; i > 0; i-- )
			fprintf(tf, "(%s)%d", line[i].str, line[i].dx);
		    fprintf(tf, " %d %d %d t\n", textcount, stringstart, lasty);
		} else fprintf(tf, "(%s)%d %d w\n", line[1].str, stringstart, lasty);
		break;

	    case MAXENCODING+1:
		fprintf(tf, ")%d ", stringstart);
		fprintf(tf, "%d %d drawrvbox ", lastend - rvslop, (int)(lastx + .5) + rvslop);
		fprintf(tf, "t\n", stringstart);
		lastend = (lastx + .5) + 2 * rvslop;
		break;

	    case MAXENCODING+2:
		fprintf(tf, ")%d %d t\n", stringstart, lasty);
		break;
	}   /* End switch */
    }	/* End if */

    textcount = 0;

}   /* End of endtext */


/*****************************************************************************/


static void
endstring(void)
{
    int		dx;

/*
 *
 * Horizontal positions are out of sync. End the last open string, adjust the
 * printer's position, and start a new string. Assumes we've already started
 * accumulating text.
 *
 */


    switch ( encoding )  {
	case 0:
	case 1:
	    fprintf(tf, ")%d(", stringstart);
	    textcount++;
	    lastx = stringstart = hpos;
	    break;

	case 2:
	case 3:
	    dx = hpos - lastx;
	    if ( spacecount++ == 0 )
		line[textcount].dx = dx;
	    if ( line[textcount].dx != dx )  {
		*strptr++ = '\0';
		line[textcount].width = lastx - line[textcount].start;
		line[++textcount].str = strptr;
		*strptr++ = ' ';
		line[textcount].dx = dx;
		line[textcount].start = lastx;
		line[textcount].width = 0;
		line[textcount].spaces = 1;
	    } else {
		*strptr++ = ' ';
		line[textcount].spaces++;
	    }	/* End else */
	    lastx += dx;
	    break;

	case MAXENCODING+1:
	    fprintf(tf, ")%d(", stringstart);
	    textcount++;
	    lastx = stringstart = hpos;
	    break;

	case MAXENCODING+2:
	    endtext();
	    starttext();
	    break;

    }	/* End switch */

}   /* End of endstring */


/*****************************************************************************/


static void
endline(void)
{

/*
 *
 * The vertical position has changed. Dump any accumulated text, then adjust
 * the printer's vertical position.
 *
 */


    endtext();

    if ( encoding == 0 || encoding == MAXENCODING+1 )
	fprintf(tf, "%d %d m\n", hpos, vpos);

    lastx = stringstart = lastend = hpos;
    lasty = vpos;

}   /* End of endline */


/*****************************************************************************/


static void
addchar(int c)
    /* next character in current string */
{

/*
 *
 * Does whatever is needed to add character c to the current string.
 *
 */


    switch ( encoding )  {
	case 0:
	case 1:
	    putc(c, tf);
	    break;

	case 2:
	case 3:
	    *strptr++ = c;
	    break;

	case MAXENCODING+1:
	case MAXENCODING+2:
	    putc(c, tf);
	    break;
    }	/* End switch */

}   /* End of addchar */


/*****************************************************************************/


static void
addoctal(int c)
    /* add it as an octal escape */
{


/*
 *
 * Adds c to the current string as an octal escape \ddd.
 *
 */


    switch ( encoding )  {
	case 0:
	case 1:
	    fprintf(tf, "\\%o", c);
	    break;

	case 2:
	case 3:
	    sprintf(strptr, "\\%o", c);
	    strptr += strlen(strptr);
	    break;

	case MAXENCODING+1:
	case MAXENCODING+2:
	    fprintf(tf, "\\%o", c);
	    break;
    }	/* End switch */

}   /* End of addoctal */


/*****************************************************************************/


static void
charlib(int code)
    /* either 1 or 2 */
{
    char	*name;			/* name of the character */
    char	tname[10];		/* in case it's a single ASCII character */


/*
 *
 * Called from oput() for characters having codes less than 040. Special files
 * that define PostScript procedures for certain characters can be found in
 * directory *fontdir/devpost/charlib. If there's a file that has the same name as
 * the character we're trying to print it's copied to the output file, otherwise
 * nothing, except some positioning, is done.
 *
 * All character definitions are only made once. Subsequent requests to print the
 * character generate a call to a procedure that begins with the prefix build_ and
 * ends with the character's name. Special characters that are assigned codes
 * other than 1 are assumed to have additional data files that should be copied
 * to the output file immediately after the build_ call. Those data files should
 * end in the suffix .map, and usually will be a hex representation of a bitmap.
 *
 */


    endtext();

    if ( lastc < 128 )  {		/* just a simple ASCII character */
	sprintf(tname, "%.3o", lastc);
	name = tname;
    } else name = &chname[chtab[lastc - 128]];

    if ( downloaded[lastc] == 0 )  {
	sprintf(temp, "%s/dev%s/charlib/%s", fontdir, realdev, name);
	if ( access(temp, 04) == 0 && doglobal(temp) == TRUE )  {
	    downloaded[lastc] = 1;
	    t_sf();
	}   /* End if */
    }	/* End if */

    if ( downloaded[lastc] == 1 )  {
	xymove(hpos, vpos);
	fprintf(tf, "%d build_%s\n", (int) lastw, name);
	if ( code != 1 )  {		/* get the bitmap or whatever */
	    sprintf(temp, "%s/dev%s/charlib/%s.map", fontdir, realdev, name);
	    if ( access(temp, 04) == 0 && tf == stdout )
		cat(temp);
	}   /* End if */
	fprintf(tf, "%d %d m\n", stringstart = hpos + lastw, vpos);
    }	/* End if */

}   /* End of charlib */


/*****************************************************************************/


int
doglobal(char *name)
    /* copy this to the output - globally */
{
    int		val = FALSE;		/* returned to the caller */


/*
 *
 * Copies file *name to the output file and brackets it with whatever commands are
 * needed to have it exported to the global environment. TRUE is returned if we
 * successfully add file *name to the output file.
 *
 */


    if ( tf == stdout )  {
	endtext();
	fprintf(tf, "cleartomark restore\n");
	fprintf(tf, "%s", BEGINGLOBAL);
	val = cat(name);
	fprintf(tf, "%s", ENDGLOBAL);
	fprintf(tf, "save mark\n");
	reset();
    }	/* End if */

    return(val);

}   /* End of doglobal */


/*****************************************************************************/


static void
documentfonts(void)
{
    FILE	*fp_in;			/* PostScript font name read from here */
    FILE	*fp_out;		/* and added to this file */


/*
 *
 * Whenever a new font is used we try to record the appropriate PostScript font
 * name in *temp_file for the DOCUMENTFONTS comment that's put out in done().
 * By default PostScript font names are found in /usr/lib/font/devpost. Fonts
 * that have a .name file are recorded in *temp_file. The first string in that
 * file is expected to be that font's (long) PostScript name.
 *
 */


    if ( temp_file == NULL )		/* generate a temp file name */
	if ( (temp_file = tempnam(TEMPDIR, "dpost")) == NULL )
	    return;

    sprintf(temp, "%s/dev%s/%s.name", fontdir, realdev, fontname[font].name);

    if ( (fp_in = fopen(temp, "r")) != NULL )  {
	if ( (fp_out = fopen(temp_file, "a")) != NULL )  {
	    if ( fscanf(fp_in, "%s", temp) == 1 )  {
		if ( docfonts++ == 0 )
		    fprintf(fp_out, "%s", DOCUMENTFONTS);
		else if ( (docfonts - 1) % 8  == 0 )
		    fprintf(fp_out, "\n%s", CONTINUECOMMENT);
		fprintf(fp_out, " %s", temp);
	    }	/* End if */
	    fclose(fp_out);
	}   /* End if */
	fclose(fp_in);
    }	/* End if */

}   /* End of documentfonts */


/*****************************************************************************/


static void
redirect(int pg)
    /* next page we're printing */
{
    static FILE	*fp_null = NULL;	/* if output is turned off */


/*
 *
 * If we're not supposed to print page pg, tf will be directed to /dev/null,
 * otherwise output goes to stdout.
 *
 */


    if ( pg >= 0 && in_olist(pg) == ON )
	tf = stdout;
    else if ( (tf = fp_null) == NULL )
	tf = fp_null = fopen("/dev/null", "w");

}   /* End of redirect */