ref: 1647696236f2d10e70cd8a0fc2a04fabfa5f63a6
dir: /sys/src/cmd/postscript/postdaisy/postdaisy.c/
/*
*
* postdaisy - PostScript translator for Diablo 1640 files.
*
* A program that translates Diablo 1640 files into PostScript. Absolutely nothing
* is guaranteed. Quite a few things haven't been implemented, and what's been
* done isn't well tested. Most of the documentation used to write this program
* was taken from the 'Diablo Emulator' section of a recent Imagen manual.
*
* Some of document comments that are generated may not be right. Most of the test
* files I used produced a trailing blank page. I've put a check in formfeed() that
* won't print the last page if it doesn't contain any text, but PAGES comments may
* not be right. The DOCUMENTFONTS comment will also be wrong if auto underline or
* bold printing have been turned on by escape commands.
*
* The brute force approach used to implement horizontal and vertical tabs leaves
* much to be desired, and may not work for very small initial hmi and vmi values.
* At the very least I should have used malloc() to get space for the two tabstop
* arrays after hmi and vmi are known!
*
* Reverse printing mode hasn't been tested at all, but what's here should be
* close even though it's not efficient.
*
* The PostScript prologue is copied from *prologue before any of the input files
* are translated. The program expects that the following PostScript procedures
* are defined in that file:
*
* setup
*
* mark ... setup -
*
* Handles special initialization stuff that depends on how this 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.
*
* t
*
* mark str1 x1 str2 x2 ... strn xn y hmi t mark
*
* Handles all the text on the stack. Characters in the strings are
* printed using hmi as the character advance, and all strings are at
* vertical position y. Each string is begins at the horizontal position
* that preceeds it.
*
* f
*
* font f -
*
* Use font f, where f is the full PostScript font name. Only used when
* we switch to auto underline (Courier-Italic) or bold (Courier-Bold)
* printing.
*
* done
*
* done
*
* Makes sure the last page is printed. Only needed when we're printing
* more than one page on each sheet of paper.
*
* 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 <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 "postdaisy.h" /* a few special definitions */
char *optnames = "a:c:f:h:l:m:n:o:p:r:s:v:x:y:A:C:E:J:L:P:DI";
char *prologue = POSTDAISY; /* 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 */
char htabstops[COLUMNS]; /* horizontal */
char vtabstops[ROWS]; /* and vertical tabs */
int res = RES; /* input file resolution - sort of */
int hmi = HMI; /* horizontal motion index - 1/120 inch */
int vmi = VMI; /* vertical motion index - 1/48 inch */
int ohmi = HMI; /* original hmi */
int ovmi = VMI; /* and vmi - for tabs and char size */
int hpos = 0; /* current horizontal */
int vpos = 0; /* and vertical position */
int lastx = -1; /* printer's last horizontal */
int lasty = -1; /* and vertical position */
int lasthmi = -1; /* hmi for current text strings */
int lastc = -1; /* last printed character */
int prevx = -1; /* at this position */
int leftmargin = LEFTMARGIN; /* page margins */
int rightmargin = RIGHTMARGIN;
int topmargin = TOPMARGIN;
int bottommargin = BOTTOMMARGIN;
int stringcount = 0; /* number of strings on the stack */
int stringstart = 1; /* column where current one starts */
int advance = 1; /* -1 if in backward print mode */
int lfiscr = OFF; /* line feed implies carriage return */
int crislf = OFF; /* carriage return implies line feed */
int linespp = 0; /* lines per page if it's positive */
int markedpage = FALSE; /* helps prevent trailing blank page */
int page = 0; /* page we're working on */
int printed = 0; /* printed this many pages */
Fontmap fontmap[] = FONTMAP; /* for translating font names */
char *fontname = "Courier"; /* use this PostScript font */
int shadowprint = OFF; /* automatic bold printing if ON */
FILE *fp_in; /* 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 Diablo 1640 files into PostScript. Nothing
* is guaranteed - the program not well tested and doesn't implement everything.
*
*/
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 comments */
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() */
int n; /* for CR and LF modes */
/*
*
* 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 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 'f': /* use this PostScript font */
fontname = get_font(optarg);
fprintf(stdout, "/font /%s def\n", fontname);
break;
case 'h': /* default character spacing */
ohmi = hmi = atoi(optarg) * HSCALE;
fprintf(stdout, "/hmi %s def\n", optarg);
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': /* set CR and LF modes */
n = atoi(optarg);
if ( n & 01 )
lfiscr = ON;
else lfiscr = OFF;
if ( n & 02 )
crislf = ON;
else crislf = OFF;
break;
case 's': /* point size */
fprintf(stdout, "/pointsize %s def\n", optarg);
break;
case 'v': /* default line spacing */
ovmi = vmi = atoi(optarg) * VSCALE;
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.
*
*/
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);
} /* 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 process stdin.
*
*/
fp_in = 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, make sure the
* last page is printed, and restore the initial environment.
*
*/
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 the next input file into PostScript. The redirect(-1) call forces
* the initial output to go to /dev/null - so the stuff formfeed() does at the
* end of each page doesn't go to stdout.
*
*/
redirect(-1); /* get ready for the first page */
formfeed(); /* force PAGE comment etc. */
inittabs();
while ( (ch = getc(fp_in)) != EOF )
switch ( ch ) {
case '\010': /* backspace */
backspace();
break;
case '\011': /* horizontal tab */
htab();
break;
case '\012': /* new line */
linefeed();
break;
case '\013': /* vertical tab */
vtab();
break;
case '\014': /* form feed */
formfeed();
break;
case '\015': /* carriage return */
carriage();
break;
case '\016': /* extended character set - SO */
break;
case '\017': /* extended character set - SI */
break;
case '\031': /* next char from supplementary set */
break;
case '\033': /* 2 or 3 byte escape sequence */
escape();
break;
default:
oput(ch);
break;
} /* End switch */
formfeed(); /* next file starts on a new page? */
} /* End of text */
/*****************************************************************************/
inittabs()
{
int i; /* loop index */
/*
*
* Initializes the horizontal and vertical tab arrays. The way tabs are handled is
* quite inefficient and may not work for all initial hmi or vmi values.
*
*/
for ( i = 0; i < COLUMNS; i++ )
htabstops[i] = ((i % 8) == 0) ? ON : OFF;
for ( i = 0; i < ROWS; i++ )
vtabstops[i] = ((i * ovmi) > BOTTOMMARGIN) ? ON : OFF;
} /* End of inittabs */
/*****************************************************************************/
cleartabs()
{
int i; /* loop index */
/*
*
* Clears all horizontal and vertical tab stops.
*
*/
for ( i = 0; i < ROWS; i++ )
htabstops[i] = OFF;
for ( i = 0; i < COLUMNS; i++ )
vtabstops[i] = OFF;
} /* End of cleartabs */
/*****************************************************************************/
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. I've added a simple test before the showpage that
* should eliminate the extra blank page that was put out at the end of many jobs,
* but the PAGES comments may be wrong.
*
*/
if ( fp_out == stdout ) /* count the last page */
printed++;
endline(); /* print the last line */
fprintf(fp_out, "cleartomark\n");
if ( feof(fp_in) == 0 || markedpage == TRUE )
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);
vgoto(topmargin);
hgoto(leftmargin);
markedpage = FALSE;
} /* End of formfeed */
/*****************************************************************************/
linefeed()
{
int line = 0; /* current line - based on ovmi */
/*
*
* Adjust our current vertical position. If we've passed the bottom of the page
* or exceeded the number of lines per page, print it and go to the upper left
* corner of the next page. This routine is also called from carriage() if crislf
* is ON.
*
*/
vmot(vmi);
if ( lfiscr == ON )
hgoto(leftmargin);
if ( linespp > 0 ) /* means something so see where we are */
line = vpos / ovmi + 1;
if ( vpos > bottommargin || line > linespp )
formfeed();
} /* End of linefeed */
/*****************************************************************************/
carriage()
{
/*
*
* Handles carriage return character. If crislf is ON we'll generate a line feed
* every time we get a carriage return character.
*
*/
if ( shadowprint == ON ) /* back to normal mode */
changefont(fontname);
advance = 1;
shadowprint = OFF;
hgoto(leftmargin);
if ( crislf == ON )
linefeed();
} /* End of carriage */
/*****************************************************************************/
htab()
{
int col; /* 'column' we'll be at next */
int i; /* loop index */
/*
*
* Tries to figure out where the next tab stop is. Wasn't positive about this
* one, since hmi can change. I'll assume columns are determined by the original
* value of hmi. That fixes them on the page, which seems to make more sense than
* letting them float all over the place.
*
*/
endline();
col = hpos/ohmi + 1;
for ( i = col; i < ROWS; i++ )
if ( htabstops[i] == ON ) {
col = i;
break;
} /* End if */
hgoto(col * ohmi);
lastx = hpos;
} /* End of htab */
/*****************************************************************************/
vtab()
{
int line; /* line we'll be at next */
int i; /* loop index */
/*
*
* Looks for the next vertical tab stop in the vtabstops[] array and moves to that
* line. If we don't find a tab we'll just move down one line - shouldn't happen.
*
*/
endline();
line = vpos/ovmi + 1;
for ( i = line; i < COLUMNS; i++ )
if ( vtabstops[i] == ON ) {
line = i;
break;
} /* End if */
vgoto(line * ovmi);
} /* End of vtab */
/*****************************************************************************/
backspace()
{
/*
*
* Moves backwards a distance equal to the current value of hmi, but don't go
* past the left margin.
*
*/
endline();
if ( hpos - leftmargin >= hmi )
hmot(-hmi);
else hgoto(leftmargin); /* maybe just ignore the backspace?? */
lastx = hpos;
} /* End of backspace */
/*****************************************************************************/
escape()
{
int ch; /* control character */
/*
*
* Handles special codes that are expected to follow an escape character. The
* initial escape character is followed by one or two bytes.
*
*/
switch ( ch = getc(fp_in) ) {
case 'T': /* top margin */
topmargin = vpos;
break;
case 'L': /* bottom margin */
bottommargin = vpos;
break;
case 'C': /* clear top and bottom margins */
bottommargin = BOTTOMMARGIN;
topmargin = TOPMARGIN;
break;
case '9': /* left margin */
leftmargin = hpos;
break;
case '0': /* right margin */
rightmargin = hpos;
break;
case '1': /* set horizontal tab */
htabstops[hpos/ohmi] = ON;
break;
case '8': /* clear horizontal tab at hpos */
htabstops[hpos/ohmi] = OFF;
break;
case '-': /* set vertical tab */
vtabstops[vpos/ovmi] = ON;
break;
case '2': /* clear all tabs */
cleartabs();
break;
case '\014': /* set lines per page */
linespp = getc(fp_in);
break;
case '\037': /* set hmi to next byte minus 1 */
hmi = HSCALE * (getc(fp_in) - 1);
break;
case 'S': /* reset hmi to default */
hmi = ohmi;
break;
case '\011': /* move to column given by next byte */
hgoto((getc(fp_in)-1) * ohmi);
break;
case '?': /* do carriage return after line feed */
lfiscr = ON;
break;
case '!': /* don't generate carriage return */
lfiscr = OFF;
break;
case '5': /* forward print mode */
advance = 1;
break;
case '6': /* backward print mode */
advance = -1;
break;
case '\036': /* set vmi to next byte minus 1 */
vmi = VSCALE * (getc(fp_in) - 1);
break;
case '\013': /* move to line given by next byte */
vgoto((getc(fp_in)-1) * ovmi);
break;
case 'U': /* positive half line feed */
vmot(vmi/2);
break;
case 'D': /* negative half line feed */
vmot(-vmi/2);
break;
case '\012': /* negative line feed */
vmot(-vmi);
break;
case '\015': /* clear all margins */
bottommargin = BOTTOMMARGIN;
topmargin = TOPMARGIN;
leftmargin = BOTTOMMARGIN;
rightmargin = RIGHTMARGIN;
break;
case 'E': /* auto underscore - use italic font */
changefont("/Courier-Oblique");
break;
case 'R': /* disable auto underscore */
changefont(fontname);
break;
case 'O': /* bold/shadow printing */
case 'W':
changefont("/Courier-Bold");
shadowprint = ON;
break;
case '&': /* disable bold printing */
changefont(fontname);
shadowprint = OFF;
break;
case '/': /* ignored 2 byte escapes */
case '\\':
case '<':
case '>':
case '%':
case '=':
case '.':
case '4':
case 'A':
case 'B':
case 'M':
case 'N':
case 'P':
case 'Q':
case 'X':
case '\010':
break;
case ',': /* ignored 3 byte escapes */
case '\016':
case '\021':
getc(fp_in);
break;
case '3': /* graphics mode - should quit! */
case '7':
case 'G':
case 'V':
case 'Y':
case 'Z':
error(FATAL, "graphics mode is not implemented");
break;
default:
error(FATAL, "missing case for escape o%o\n", ch);
break;
} /* End switch */
} /* End of escape */
/*****************************************************************************/
vmot(n)
int n; /* move this far vertically */
{
/*
*
* Move vertically n units from where we are.
*
*/
vpos += n;
} /* End of vmot */
/*****************************************************************************/
vgoto(n)
int n; /* new vertical position */
{
/*
*
* Moves to absolute vertical position n.
*
*/
vpos = n;
} /* End of vgoto */
/*****************************************************************************/
hmot(n)
int n; /* move this horizontally */
{
/*
*
* Moves horizontally n units from our current position.
*
*/
hpos += n * advance;
if ( hpos < leftmargin )
hpos = leftmargin;
} /* End of hmot */
/*****************************************************************************/
hgoto(n)
int n; /* go to this horizontal position */
{
/*
*
* Moves to absolute horizontal position n.
*
*/
hpos = n;
} /* End of hgoto */
/*****************************************************************************/
changefont(name)
char *name;
{
/*
*
* Changes the current font. Used to get in and out of auto underscore and bold
* printing.
*
*/
endline();
fprintf(fp_out, "%s f\n", name);
} /* End of changefont */
/*****************************************************************************/
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 = lastx = hpos;
lasty = vpos;
lasthmi = hmi;
lastc = -1;
prevx = -1;
stringcount = 1;
} /* End if */
} /* End of startline */
/*****************************************************************************/
endline()
{
/*
*
* Generates a call to the PostScript procedure that processes the text on the
* the stack - provided stringcount is positive.
*
*/
if ( stringcount > 0 )
fprintf(fp_out, ")%d %d %d t\n", stringstart, lasty, lasthmi);
stringcount = 0;
} /* End of endline */
/*****************************************************************************/
endstring()
{
/*
*
* Takes the string we've been working on and adds it to the output file. Called
* when we need to adjust our horizontal position before starting a new string.
* Also called from endline() when we're done with the current line.
*
*/
if ( stringcount > 0 ) {
fprintf(fp_out, ")%d(", stringstart);
lastx = stringstart = hpos;
stringcount++;
} /* End if */
} /* End of endstring */
/*****************************************************************************/
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. The only other characters that end up in
* that string are the quotes required for special characters. Reverse printing
* mode hasn't been tested but it should be close. hpos and lastx should disagree
* each time (except after startline() does something), and that should force a
* call to endstring() for every character.
*
*/
if ( stringcount > 100 ) /* don't put too much on the stack */
endline();
if ( vpos != lasty )
endline();
if ( advance == -1 ) /* for reverse printing - move first */
hmot(hmi);
startline();
if ( lastc != ch || hpos != prevx ) {
if ( lastx != hpos )
endstring();
if ( isascii(ch) && isprint(ch) ) {
if ( ch == '\\' || ch == '(' || ch == ')' )
putc('\\', fp_out);
putc(ch, fp_out);
} else fprintf(fp_out, "\\%.3o", ch & 0377);
lastc = ch;
prevx = hpos;
lastx += lasthmi;
} /* End if */
if ( advance != -1 )
hmot(hmi);
markedpage = TRUE;
} /* 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 */
/*****************************************************************************/