Subversion Repositories planix.SVN

/*

 * postprint - PostScript translator for ASCII files.

 *

 * A simple program that translates ASCII files into PostScript. All it really

 * does is expand tabs and backspaces, handle character quoting, print text lines,

 * and control when pages are started based on the requested number of lines per

 * page.

 *

 * The PostScript prologue is copied from *prologue before any of the input files

 * are translated. The program expects that the following procedures are defined

 * in that file:

 *

 *	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.

 *

 *	pagesetup

 *

 *	  page pagesetup -

 *

 *	    Does whatever is needed to set things up for the next page. Expects

 *	    to find the current page number on the stack.

 *

 *	l

 *

 *	  string l -

 *

 *	    Prints string starting in the first column and then goes to the next

 *	    line.

 *

 *	L

 *

 *	  mark string column string column ... L mark

 *

 *	    Prints each string on the stack starting at the horizontal position

 *	    selected by column. Used when tabs and spaces can be sufficiently well

 *	    compressed to make the printer overhead worthwhile. Always used when

 *	    we have to back up.

 *

 *	LL

 *

 *	  mark string column string column ... LL mark

 *

 *	    Like L, but only used to prevent potential PostScript stack overflow

 *	    from too many string/column pairs. Stays on the current line. It will

 *	    not be needed often!!

 *

 *	done

 *

 *	  done

 *

 *	    Makes sure the last page is printed. Only needed when we're printing

 *	    more than one page on each sheet of paper.

 *

 * Almost everything has been changed in this version of postprint. The program

 * is more intelligent, especially about tabs, spaces, and backspacing, and as a

 * result output files usually print faster. Output files also now conform to

 * Adobe's file structuring conventions, which is undoubtedly something I should

 * have done in the first version of the program. If the number of lines per page

 * is set to 0, which can be done using the -l option, pointsize will be used to

 * guess a reasonable value. The estimate is based on the values of LINESPP,

 * POINTSIZE, and pointsize, and assumes LINESPP lines would fit on a page if

 * we printed in size POINTSIZE. Selecting a point size using the -s option and

 * adding -l0 to the command line forces the guess to be made.

 *

 * 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.

 */

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <signal.h>

#include <ctype.h>

#ifdef plan9

#define	isascii(c)	((unsigned char)(c)<=0177)

#endif

#include <sys/types.h>

#include <fcntl.h>

#include "comments.h"			/* PostScript file structuring comments */

#include "gen.h"			/* general purpose definitions */

#include "path.h"			/* for the prologue */

#include "ext.h"			/* external variable declarations */

#include "postprint.h"			/* a few special definitions */

char	*optnames = "a:c:ef:l:m:n:o:p:r:s:t:x:y:A:C:E:J:L:P:R:DI";

char	*prologue = POSTPRINT;		/* default PostScript prologue */

char	*formfile = FORMFILE;		/* stuff for multiple pages per sheet */

int	formsperpage = 1;		/* page images on each piece of paper */

int	copies = 1;			/* and this many copies of each sheet */

int	linespp = LINESPP;		/* number of lines per page */

int	pointsize = POINTSIZE;		/* in this point size */

int	tabstops = TABSTOPS;		/* tabs set at these columns */

int	crmode = 0;			/* carriage return mode - 0, 1, or 2 */

int	extended = TRUE;		/* use escapes for unprintable chars */

int	col = 1;			/* next character goes in this column */

int	line = 1;			/* on this line */

int	stringcount = 0;		/* number of strings on the stack */

int	stringstart = 1;		/* column where current one starts */

Fontmap	fontmap[] = FONTMAP;		/* for translating font names */

char	*fontname = "Courier";		/* use this PostScript font */

int	page = 0;			/* page we're working on */

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

FILE	*fp_in = stdin;			/* read from this file */

FILE	*fp_out = stdout;		/* and write stuff here */

FILE	*fp_acct = NULL;		/* for accounting data */

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

main(agc, agv)

    int		agc;

    char	*agv[];

{

/*

 *

 * A simple program that translates ASCII files into PostScript. If there's more

 * than one input file, each begins on a new page.

 *

 */

    argc = agc;				/* other routines may want them */

    argv = agv;

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

    init_signals();			/* sets up interrupt handling */

    header();				/* PostScript header and prologue */

    options();				/* handle the command line options */

    setup();				/* for PostScript */

    arguments();			/* followed by each input file */

    done();				/* print the last page etc. */

    account();				/* job accounting data */

    exit(x_stat);			/* not much could be wrong */

}   /* End of main */

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

init_signals()

{

/*

 *

 * Makes 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 */

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

header()

{

    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' )

	    prologue = optarg;

	else if ( ch == '?' )

	    error(FATAL, "");

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

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

    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);

    if ( DOROUND )

	cat(ROUNDPAGE);

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

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

    fprintf(stdout, "mark\n");

}   /* End of header */

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

options()

{

    int		ch;			/* return value from getopt() */

/*

 *

 * Reads and processes the command line options. Added the -P option so arbitrary

 * PostScript code can be passed through. Expect it could be useful for changing

 * definitions in the prologue for which options have not been defined.

 *

 * Although any PostScript font can be used, things will only work well for

 * constant width fonts.

 *

 */

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

	switch ( ch ) {

	    case 'a':			/* aspect ratio */

		    fprintf(stdout, "/aspectratio %s def\n", optarg);

		    break;

	    case 'c':			/* copies */

		    copies = atoi(optarg);

		    fprintf(stdout, "/#copies %s store\n", optarg);

		    break;

	    case 'e':			/* obsolete - it's now always on */

		    extended = TRUE;

		    break;

	    case 'f':			/* use this PostScript font */

		    fontname = get_font(optarg);

		    fprintf(stdout, "/font /%s def\n", fontname);

		    break;

	    case 'l':			/* lines per page */

		    linespp = atoi(optarg);

		    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 'r':			/* carriage return mode */

		    crmode = atoi(optarg);

		    break;

	    case 's':			/* point size */

		    pointsize = atoi(optarg);

		    fprintf(stdout, "/pointsize %s def\n", optarg);

		    break;

	    case 't':			/* tabstops */

		    tabstops = atoi(optarg);

		    break;

	    case 'x':			/* shift things 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 straight to output */

		    if ( cat(optarg) == FALSE )

			error(FATAL, "can't read %s", optarg);

		    break;

	    case 'E':			/* text font encoding */

		    fontencoding = optarg;

		    break;

	    case 'L':			/* PostScript prologue file */

		    prologue = optarg;

		    break;

	    case 'P':			/* PostScript pass through */

		    fprintf(stdout, "%s\n", optarg);

		    break;

	    case 'R':			/* special global or page level request */

		    saverequest(optarg);

		    break;

	    case 'D':			/* debug flag */

		    debug = ON;

		    break;

	    case 'I':			/* ignore FATAL errors */

		    ignore = ON;

		    break;

	    case '?':			/* don't understand the option */

		    error(FATAL, "");

		    break;

	    default:			/* don't know what to do for ch */

		    error(FATAL, "missing case for option %c\n", ch);

		    break;

	}   /* End switch */

    }   /* End while */

    argc -= optind;			/* get ready for non-option args */

    argv += optind;

}   /* End of options */

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

char *get_font(name)

    char	*name;			/* name the user asked for */

{

    int		i;			/* for looking through fontmap[] */

/*

 *

 * Called from options() to map a user's font name into a legal PostScript name.

 * If the lookup fails *name is returned to the caller. That should let you choose

 * any PostScript font, although things will only work well for constant width

 * fonts.

 *

 */

    for ( i = 0; fontmap[i].name != NULL; i++ )

	if ( strcmp(name, fontmap[i].name) == 0 )

	    return(fontmap[i].val);

    return(name);

}   /* End of get_font */

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

setup()

{

/*

 *

 * Handles things that must be done after the options are read but before the

 * input files are processed. linespp (lines per page) can be set using the -l

 * option. If it's not positive we calculate a reasonable value using the

 * requested point size - assuming LINESPP lines fit on a page in point size

 * POINTSIZE.

 *

 */

    writerequest(0, stdout);		/* global requests eg. manual feed */

    setencoding(fontencoding);

    fprintf(stdout, "setup\n");

    if ( formsperpage > 1 ) {

	if ( cat(formfile) == FALSE )

	    error(FATAL, "can't read %s", formfile);

	fprintf(stdout, "%d setupforms\n", formsperpage);

    }	/* End if */

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

    if ( linespp <= 0 )

	linespp = LINESPP * POINTSIZE / pointsize;

}   /* End of setup */

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

arguments()

{

/*

 *

 * 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 )

	text();

    else {				/* at least one argument is left */

	while ( argc > 0 ) {

	    if ( strcmp(*argv, "-") == 0 )

		fp_in = stdin;

	    else if ( (fp_in = fopen(*argv, "r")) == NULL )

		error(FATAL, "can't open %s", *argv);

	    text();

	    if ( fp_in != stdin )

		fclose(fp_in);

	    argc--;

	    argv++;

	}   /* End while */

    }   /* End else */

}   /* End of arguments */

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

done()

{

/*

 *

 * 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 PAGES comment

 * that can only be determined after all the input files have been read.

 *

 */

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

    fprintf(stdout, "done\n");

    fprintf(stdout, "%s %s\n", DOCUMENTFONTS, fontname);

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

}   /* End of done */

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

account()

{

/*

 *

 * 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 */

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

text()

{

    int		ch;			/* next input character */

/*

 *

 * Translates *fp_in into PostScript. Intercepts space, tab, backspace, newline,

 * return, and formfeed. Everything else goes to oput(), which handles quoting

 * (if needed) and escapes for nonascii characters if extended is TRUE. The

 * redirect(-1) call forces the initial output to go to /dev/null - so stuff

 * that formfeed() does at the end of each page goes to /dev/null rather than

 * the real output file.

 *

 */

    redirect(-1);			/* get ready for the first page */

    formfeed();				/* force PAGE comment etc. */

    while ( (ch = getc(fp_in)) != EOF )

	switch ( ch ) {

	    case '\n':

		    newline();

		    break;

	    case '\t':

	    case '\b':

	    case ' ':

		    spaces(ch);

		    break;

	    case '\014':

		    formfeed();

		    break;

	    case '\r':

		    if ( crmode == 1 )

			spaces(ch);

		    else if ( crmode == 2 )

			newline();

		    break;

	    default:

		    oput(ch);

		    break;

	}   /* End switch */

    formfeed();				/* next file starts on a new page? */

}   /* End of text */

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

formfeed()

{

/*

 *

 * Called whenever we've finished with the last page and want to get ready for the

 * next one. Also used at the beginning and end of each input file, so we have to

 * be careful about what's done. The first time through (up to the redirect() call)

 * output goes to /dev/null.

 *

 * 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 ( fp_out == stdout )		/* count the last page */

	printed++;

    endline();				/* print the last line */

    fprintf(fp_out, "cleartomark\n");

    fprintf(fp_out, "showpage\n");

    fprintf(fp_out, "saveobj restore\n");

    fprintf(fp_out, "%s %d %d\n", ENDPAGE, page, printed);

    if ( ungetc(getc(fp_in), fp_in) == EOF )

	redirect(-1);

    else redirect(++page);

    fprintf(fp_out, "%s %d %d\n", PAGE, page, printed+1);

    fprintf(fp_out, "/saveobj save def\n");

    fprintf(fp_out, "mark\n");

    writerequest(printed+1, fp_out);

    fprintf(fp_out, "%d pagesetup\n", printed+1);

    line = 1;

}   /* End of formfeed */

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

newline()

{

/*

 *

 * Called when we've read a newline character. The call to startline() ensures

 * that at least an empty string is on the stack.

 *

 */

    startline();

    endline();				/* print the current line */

    if ( ++line > linespp )		/* done with this page */

	formfeed();

}   /* End of newline */

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

spaces(ch)

    int		ch;			/* next input character */

{

    int		endcol;			/* ending column */

    int		i;			/* final distance - in spaces */

/*

 *

 * Counts consecutive spaces, tabs, and backspaces and figures out where the next

 * string should start. Once that's been done we try to choose an efficient way

 * to output the required number of spaces. The choice is between using procedure

 * l with a single string on the stack and L with several string and column pairs.

 * We usually break even, in terms of the size of the output file, if we need four

 * consecutive spaces. More means using L decreases the size of the file. For now

 * if there are less than 6 consecutive spaces we just add them to the current

 * string, otherwise we end that string, follow it by its starting position, and

 * begin a new one that starts at endcol. Backspacing is always handled this way.

 *

 */

    startline();			/* so col makes sense */

    endcol = col;

    do {

	if ( ch == ' ' )

	    endcol++;

	else if ( ch == '\t' )

	    endcol += tabstops - ((endcol - 1) % tabstops);

	else if ( ch == '\b' )

	    endcol--;

	else if ( ch == '\r' )

	    endcol = 1;

	else break;

    } while ( ch = getc(fp_in) );	/* if ch is 0 we'd quit anyway */

    ungetc(ch, fp_in);			/* wasn't a space, tab, or backspace */

    if ( endcol < 1 )			/* can't move past left edge */

	endcol = 1;

    if ( (i = endcol - col) >= 0 && i < 6 )

	for ( ; i > 0; i-- )

	    oput((int)' ');

    else {

	endstring();

	col = stringstart = endcol;

    }	/* End else */

}   /* End of spaces */

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

startline()

{

/*

 *

 * Called whenever we want to be certain we're ready to start pushing characters

 * into an open string on the stack. If stringcount is positive we've already

 * started, so there's nothing to do. The first string starts in column 1.

 *

 */

    if ( stringcount < 1 ) {

	putc('(', fp_out);

	stringstart = col = 1;

	stringcount = 1;

    }	/* End if */

}   /* End of startline */

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

endstring()

{

/*

 *

 * End the current string and start a new one.

 *

 */

    if ( stringcount > 100 ) {		/* don't put too much on the stack */

	fprintf(fp_out, ")%d LL\n(", stringstart-1);

	stringcount = 2;		/* kludge - don't let endline() use l */

    } else {

	fprintf(fp_out, ")%d(", stringstart-1);

	stringcount++;

    }   /* End else */

}   /* End of endstring */

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

endline()

{

/*

 *

 * Generates a call to the PostScript procedure that processes all the text on

 * the stack - provided stringcount is positive. If one string is on the stack

 * the fast procedure (ie. l) is used to print the line, otherwise the slower

 * one that processes string and column pairs is used.

 *

 */

    if ( stringcount == 1 )

	fprintf(fp_out, ")l\n");

    else if ( stringcount > 1 )

	fprintf(fp_out, ")%d L\n", stringstart-1);

    stringcount = 0;

}   /* End of endline */

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

oput(ch)

    int		ch;			/* next output character */

{

/*

 *

 * Responsible for adding all printing characters from the input file to the

 * open string on top of the stack.

 *

 */

    if ( isascii(ch) && isprint(ch) ) {

	startline();

	if ( ch == '(' || ch == ')' || ch == '\\' )

	    putc('\\', fp_out);

	putc(ch, fp_out);

	col++;

    } else if ( extended == TRUE ) {

	startline();

	fprintf(fp_out, "\\%.3o", ch & 0377);

	col++;

    }	/* End if */

}   /* End of oput */

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

redirect(pg)

    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, fp_out will be directed to /dev/null,

 * otherwise output goes to stdout.

 *

 */

    if ( pg >= 0 && in_olist(pg) == ON )

	fp_out = stdout;

    else if ( (fp_out = fp_null) == NULL )

	fp_out = fp_null = fopen("/dev/null", "w");

}   /* End of redirect */

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