| 2 |
- |
1 |
/*
|
|
|
2 |
*
|
|
|
3 |
* postbgi - BGI (Basic Graphical Instructions) to PostScript translator.
|
|
|
4 |
*
|
|
|
5 |
* A simple program that translates BGI files into PostScript. Probably only
|
|
|
6 |
* useful in Computer Centers that support STARE or PRISM plotters. Most of the
|
|
|
7 |
* code was borrowed from the corresponding program that was written for printers
|
|
|
8 |
* that understand Impress.
|
|
|
9 |
*
|
|
|
10 |
* Extending the original program to handle PRISM jobs was not trivial. Graphics
|
|
|
11 |
* packages that support PRISM occasionally use BGI commands that I ignored in the
|
|
|
12 |
* STARE implementation. Subroutines, color requests, patterns (for filling), and
|
|
|
13 |
* filled trapeziods were the most important omissions. All are now implemented,
|
|
|
14 |
* and at present only repeats, filled slices, and raster rectangles are missing.
|
|
|
15 |
*
|
|
|
16 |
* Pattern filling results were not always predictable or even good, unless the
|
|
|
17 |
* halftone screen definitions were changed and scaling was adjusted so one pixel
|
|
|
18 |
* in user space mapped into an integral number of device space pixels. Doing that
|
|
|
19 |
* makes the resulting PostScript output device dependent, but was often necessary.
|
|
|
20 |
* I've added two booleans to the PostScript prologue (fixscreen and scaletodevice)
|
|
|
21 |
* that control what's done. By default both are false (check postbgi.ps) but can
|
|
|
22 |
* be set to true on the command line using the -P option or by hand by changing
|
|
|
23 |
* the definitions in the prologue. A command line that would set fixscreen and
|
|
|
24 |
* scaletodevice true would look like,
|
|
|
25 |
*
|
|
|
26 |
* postbgi -P"/fixscreen true" -P"/scaletodevice true" file >file.ps
|
|
|
27 |
*
|
|
|
28 |
* Several other approaches are available if you want to have your spooler handle
|
|
|
29 |
* STARE and PRISM jobs differently. A boolean called prism is defined in the
|
|
|
30 |
* prologue (postbgi.ps) and if it's set to true PostScript procedure setup will
|
|
|
31 |
* set fixscreen and scaletodevice to true before anything important is done. That
|
|
|
32 |
* means the following command line,
|
|
|
33 |
*
|
|
|
34 |
* postbgi -P"/prism true" file >file.ps
|
|
|
35 |
*
|
|
|
36 |
* accomplishes the same things as the last example. Two different prologue files,
|
|
|
37 |
* one for STARE jobs and the other for PRISM, could be used and the spooler could
|
|
|
38 |
* point postbgi to the appropriate one using the -L option. In that case the only
|
|
|
39 |
* important difference in the two prologues would be the definition of prism. The
|
|
|
40 |
* prologue used for PRISM jobs would have prism set to true, while the STARE
|
|
|
41 |
* prologue would have it set to false.
|
|
|
42 |
*
|
|
|
43 |
* Also included is code that ties lines to device space coordinates. What you get
|
|
|
44 |
* is a consistent line thickness, but placement of lines won't be exact. It's a
|
|
|
45 |
* trade-off that should be right for most jobs. Everything is implemented in the
|
|
|
46 |
* prologue (postbgi.ps) and nothing will be done if the linewidth is zero or if
|
|
|
47 |
* the boolean fixlinewidth (again in postbgi.ps) is false. Once again the -P
|
|
|
48 |
* option can be used to set fixlinewidth to whatever you choose.
|
|
|
49 |
*
|
|
|
50 |
* BGI supports color mixing but PostScript doesn't. BGI files that expect to mix
|
|
|
51 |
* colors won't print properly. PostScript's fill operator overlays whatever has
|
|
|
52 |
* already been put down. Implementing color mixing would have been a terribly
|
|
|
53 |
* difficult job - not worth the effort!
|
|
|
54 |
*
|
|
|
55 |
* The PostScript prologue is copied from *prologue before any of the input files
|
|
|
56 |
* are translated. The program expects that the following PostScript procedures
|
|
|
57 |
* are defined in that file:
|
|
|
58 |
*
|
|
|
59 |
* setup
|
|
|
60 |
*
|
|
|
61 |
* mark ... setup -
|
|
|
62 |
*
|
|
|
63 |
* Handles special initialization stuff that depends on how the program
|
|
|
64 |
* was called. Expects to find a mark followed by key/value pairs on the
|
|
|
65 |
* stack. The def operator is applied to each pair up to the mark, then
|
|
|
66 |
* the default state is set up.
|
|
|
67 |
*
|
|
|
68 |
* pagesetup
|
|
|
69 |
*
|
|
|
70 |
* page pagesetup -
|
|
|
71 |
*
|
|
|
72 |
* Does whatever is needed to set things up for the next page. Expects
|
|
|
73 |
* to find the current page number on the stack.
|
|
|
74 |
*
|
|
|
75 |
* v
|
|
|
76 |
*
|
|
|
77 |
* dx1 dy1 ... dxn dyn x y v -
|
|
|
78 |
*
|
|
|
79 |
* Draws the vector described by the numbers on the stack. The top two
|
|
|
80 |
* numbers are the coordinates of the starting point. The rest of the
|
|
|
81 |
* numbers are relative displacements from the preceeding point.
|
|
|
82 |
*
|
|
|
83 |
* pp
|
|
|
84 |
*
|
|
|
85 |
* x1 y1 ... xn yn string pp -
|
|
|
86 |
*
|
|
|
87 |
* Prints string, which is always a single character, at the points
|
|
|
88 |
* represented by the rest of the numbers on the stack.
|
|
|
89 |
*
|
|
|
90 |
* R
|
|
|
91 |
*
|
|
|
92 |
* n deltax deltay x y R -
|
|
|
93 |
*
|
|
|
94 |
* Creates a rectangular path with its lower left corner at (x, y) and
|
|
|
95 |
* sides of length deltax and deltay. The resulting path is stroked if
|
|
|
96 |
* n is 0 and filled otherwise.
|
|
|
97 |
*
|
|
|
98 |
* T
|
|
|
99 |
*
|
|
|
100 |
* dx3 dy3 dx2 dy2 dx1 dy1 x y T -
|
|
|
101 |
*
|
|
|
102 |
* Fills a trapezoid starting at (x, y) and having relative displacements
|
|
|
103 |
* given by the (dx, dy) pairs.
|
|
|
104 |
*
|
|
|
105 |
* t
|
|
|
106 |
*
|
|
|
107 |
* angle x y string t -
|
|
|
108 |
*
|
|
|
109 |
* Prints string starting at (x, y) using an orientation of angle degrees.
|
|
|
110 |
* The PostScript procedure can handle any angle, but BGI files will only
|
|
|
111 |
* request 0 or 90 degrees. Text printed at any other orientation will be
|
|
|
112 |
* vector generated.
|
|
|
113 |
*
|
|
|
114 |
* p
|
|
|
115 |
*
|
|
|
116 |
* x y p -
|
|
|
117 |
*
|
|
|
118 |
* Called to mark the point (x, y). It fills a small circle, that right
|
|
|
119 |
* now has a constant radius. This stuff could probably be much more
|
|
|
120 |
* efficient?
|
|
|
121 |
*
|
|
|
122 |
* l
|
|
|
123 |
*
|
|
|
124 |
* array l -
|
|
|
125 |
*
|
|
|
126 |
* Sets the line drawing mode according to the description given in
|
|
|
127 |
* array. The arrays that describe the different line styles are declared
|
|
|
128 |
* in STYLES (file posttek.h), although it would be better to have them
|
|
|
129 |
* defined in the prologue.
|
|
|
130 |
*
|
|
|
131 |
* c
|
|
|
132 |
*
|
|
|
133 |
* red green blue c -
|
|
|
134 |
*
|
|
|
135 |
* Sets the current PostScript RGB color using setrgbcolor. Also used for
|
|
|
136 |
* selecting appropriate patterns as colors.
|
|
|
137 |
*
|
|
|
138 |
* f
|
|
|
139 |
*
|
|
|
140 |
* bgisize f -
|
|
|
141 |
*
|
|
|
142 |
* Changes the size of the font that's used to print text. bgisize is a
|
|
|
143 |
* grid separation in a 5 by 7 array in which characters are assumed to
|
|
|
144 |
* be built.
|
|
|
145 |
*
|
|
|
146 |
* done
|
|
|
147 |
*
|
|
|
148 |
* done
|
|
|
149 |
*
|
|
|
150 |
* Makes sure the last page is printed. Only needed when we're printing
|
|
|
151 |
* more than one page on each sheet of paper.
|
|
|
152 |
*
|
|
|
153 |
* The default line width is zero, which forces lines to be one pixel wide. That
|
|
|
154 |
* works well for 'write to black' engines but won't be right for 'write to white'
|
|
|
155 |
* engines. The line width can be changed using the -w option, or you can change
|
|
|
156 |
* the initialization of linewidth in the prologue. Code in the prologue supports
|
|
|
157 |
* the generation of uniform width lines when linewidth is non-zero and boolean
|
|
|
158 |
* fixlinewidth is true.
|
|
|
159 |
*
|
|
|
160 |
* Many default values, like the magnification and orientation, are defined in
|
|
|
161 |
* the prologue, which is where they belong. If they're changed (by options), an
|
|
|
162 |
* appropriate definition is made after the prologue is added to the output file.
|
|
|
163 |
* The -P option passes arbitrary PostScript through to the output file. Among
|
|
|
164 |
* other things it can be used to set (or change) values that can't be accessed by
|
|
|
165 |
* other options.
|
|
|
166 |
*
|
|
|
167 |
*/
|
|
|
168 |
|
|
|
169 |
#include <stdio.h>
|
|
|
170 |
#include <sys/types.h>
|
|
|
171 |
#include <fcntl.h>
|
|
|
172 |
#include <signal.h>
|
|
|
173 |
#include <math.h>
|
|
|
174 |
#include <ctype.h>
|
|
|
175 |
#ifdef plan9
|
|
|
176 |
#define isascii(c) ((unsigned char)(c)<=0177)
|
|
|
177 |
#endif
|
|
|
178 |
|
|
|
179 |
#include "comments.h" /* PostScript file structuring comments */
|
|
|
180 |
#include "gen.h" /* general purpose definitions */
|
|
|
181 |
#include "path.h" /* for the prologue */
|
|
|
182 |
#include "ext.h" /* external variable declarations */
|
|
|
183 |
#include "postbgi.h" /* a few definitions just used here */
|
|
|
184 |
|
|
|
185 |
char *optnames = "a:c:f:m:n:o:p:w:x:y:A:C:E:J:L:P:R:DI";
|
|
|
186 |
|
|
|
187 |
char *prologue = POSTBGI; /* default PostScript prologue */
|
|
|
188 |
char *formfile = FORMFILE; /* stuff for multiple pages per sheet */
|
|
|
189 |
|
|
|
190 |
int formsperpage = 1; /* page images on each piece of paper */
|
|
|
191 |
int copies = 1; /* and this many copies of each sheet */
|
|
|
192 |
|
|
|
193 |
char *styles[] = STYLES; /* descriptions of line styles */
|
|
|
194 |
|
|
|
195 |
int hpos = 0; /* current horizontal */
|
|
|
196 |
int vpos = 0; /* and vertical position */
|
|
|
197 |
|
|
|
198 |
int bgisize = BGISIZE; /* just the character grid spacing */
|
|
|
199 |
int linespace; /* distance between lines of text */
|
|
|
200 |
|
|
|
201 |
int bgimode; /* character or graph mode */
|
|
|
202 |
|
|
|
203 |
int in_subr = FALSE; /* currently defining a subroutine */
|
|
|
204 |
int in_global = FALSE; /* to save space with subroutine defs */
|
|
|
205 |
int subr_id = 0; /* defining this subroutine */
|
|
|
206 |
int shpos = 0; /* starting horizontal */
|
|
|
207 |
int svpos = 0; /* and vertical positions - subroutines */
|
|
|
208 |
Disp displacement[64]; /* dx and dy after a subroutine call */
|
|
|
209 |
|
|
|
210 |
Fontmap fontmap[] = FONTMAP; /* for translating font names */
|
|
|
211 |
char *fontname = "Courier"; /* use this PostScript font */
|
|
|
212 |
|
|
|
213 |
int page = 0; /* page we're working on */
|
|
|
214 |
int printed = 0; /* printed this many pages */
|
|
|
215 |
|
|
|
216 |
FILE *fp_in = stdin; /* read from this file */
|
|
|
217 |
FILE *fp_out = NULL; /* and write stuff here */
|
|
|
218 |
FILE *fp_acct = NULL; /* for accounting data */
|
|
|
219 |
|
|
|
220 |
/*****************************************************************************/
|
|
|
221 |
|
|
|
222 |
main(agc, agv)
|
|
|
223 |
|
|
|
224 |
int agc;
|
|
|
225 |
char *agv[];
|
|
|
226 |
|
|
|
227 |
{
|
|
|
228 |
|
|
|
229 |
/*
|
|
|
230 |
*
|
|
|
231 |
* A program that converts BGI (Basic Graphical Instructions) files generated by
|
|
|
232 |
* packages like GRAFPAC and DISSPLA into PostScript. It does an adequate job but
|
|
|
233 |
* is far from perfect. A few things still haven't been implemented (eg. repeats
|
|
|
234 |
* and raster rectangles), but what's here should be good enough for most of our
|
|
|
235 |
* STARE and PRISM jobs. Color mixing (in PRISM jobs) won't work on PostScript
|
|
|
236 |
* printers, and there's no chance I'll implement it!
|
|
|
237 |
*
|
|
|
238 |
*/
|
|
|
239 |
|
|
|
240 |
argc = agc; /* global so everyone can use them */
|
|
|
241 |
argv = agv;
|
|
|
242 |
|
|
|
243 |
prog_name = argv[0]; /* just for error messages */
|
|
|
244 |
|
|
|
245 |
init_signals(); /* set up interrupt handling */
|
|
|
246 |
header(); /* PostScript header comments */
|
|
|
247 |
options(); /* command line options */
|
|
|
248 |
setup(); /* for PostScript */
|
|
|
249 |
arguments(); /* followed by each input file */
|
|
|
250 |
done(); /* print the last page etc. */
|
|
|
251 |
account(); /* job accounting data */
|
|
|
252 |
|
|
|
253 |
exit(x_stat); /* everything probably went OK */
|
|
|
254 |
|
|
|
255 |
} /* End of main */
|
|
|
256 |
|
|
|
257 |
/*****************************************************************************/
|
|
|
258 |
|
|
|
259 |
init_signals()
|
|
|
260 |
|
|
|
261 |
{
|
|
|
262 |
|
|
|
263 |
/*
|
|
|
264 |
*
|
|
|
265 |
* Make sure we handle interrupts.
|
|
|
266 |
*
|
|
|
267 |
*/
|
|
|
268 |
|
|
|
269 |
if ( signal(SIGINT, interrupt) == SIG_IGN ) {
|
|
|
270 |
signal(SIGINT, SIG_IGN);
|
|
|
271 |
signal(SIGQUIT, SIG_IGN);
|
|
|
272 |
signal(SIGHUP, SIG_IGN);
|
|
|
273 |
} else {
|
|
|
274 |
signal(SIGHUP, interrupt);
|
|
|
275 |
signal(SIGQUIT, interrupt);
|
|
|
276 |
} /* End else */
|
|
|
277 |
|
|
|
278 |
signal(SIGTERM, interrupt);
|
|
|
279 |
|
|
|
280 |
} /* End of init_signals */
|
|
|
281 |
|
|
|
282 |
/*****************************************************************************/
|
|
|
283 |
|
|
|
284 |
header()
|
|
|
285 |
|
|
|
286 |
{
|
|
|
287 |
|
|
|
288 |
int ch; /* return value from getopt() */
|
|
|
289 |
int old_optind = optind; /* for restoring optind - should be 1 */
|
|
|
290 |
|
|
|
291 |
/*
|
|
|
292 |
*
|
|
|
293 |
* Scans the option list looking for things, like the prologue file, that we need
|
|
|
294 |
* right away but could be changed from the default. Doing things this way is an
|
|
|
295 |
* attempt to conform to Adobe's latest file structuring conventions. In particular
|
|
|
296 |
* they now say there should be nothing executed in the prologue, and they have
|
|
|
297 |
* added two new comments that delimit global initialization calls. Once we know
|
|
|
298 |
* where things really are we write out the job header, follow it by the prologue,
|
|
|
299 |
* and then add the ENDPROLOG and BEGINSETUP comments.
|
|
|
300 |
*
|
|
|
301 |
*/
|
|
|
302 |
|
|
|
303 |
while ( (ch = getopt(argc, argv, optnames)) != EOF )
|
|
|
304 |
if ( ch == 'L' )
|
|
|
305 |
prologue = optarg;
|
|
|
306 |
else if ( ch == '?' )
|
|
|
307 |
error(FATAL, "");
|
|
|
308 |
|
|
|
309 |
optind = old_optind; /* get ready for option scanning */
|
|
|
310 |
|
|
|
311 |
fprintf(stdout, "%s", CONFORMING);
|
|
|
312 |
fprintf(stdout, "%s %s\n", VERSION, PROGRAMVERSION);
|
|
|
313 |
fprintf(stdout, "%s %s\n", DOCUMENTFONTS, ATEND);
|
|
|
314 |
fprintf(stdout, "%s %s\n", PAGES, ATEND);
|
|
|
315 |
fprintf(stdout, "%s", ENDCOMMENTS);
|
|
|
316 |
|
|
|
317 |
if ( cat(prologue) == FALSE )
|
|
|
318 |
error(FATAL, "can't read %s", prologue);
|
|
|
319 |
|
|
|
320 |
fprintf(stdout, "%s", ENDPROLOG);
|
|
|
321 |
fprintf(stdout, "%s", BEGINSETUP);
|
|
|
322 |
fprintf(stdout, "mark\n");
|
|
|
323 |
|
|
|
324 |
} /* End of header */
|
|
|
325 |
|
|
|
326 |
/*****************************************************************************/
|
|
|
327 |
|
|
|
328 |
options()
|
|
|
329 |
|
|
|
330 |
{
|
|
|
331 |
|
|
|
332 |
int ch; /* option name - from getopt() */
|
|
|
333 |
|
|
|
334 |
/*
|
|
|
335 |
*
|
|
|
336 |
* Reads and processes the command line options.
|
|
|
337 |
*
|
|
|
338 |
*/
|
|
|
339 |
|
|
|
340 |
while ( (ch = getopt(argc, argv, optnames)) != EOF ) {
|
|
|
341 |
switch ( ch ) {
|
|
|
342 |
case 'a': /* aspect ratio */
|
|
|
343 |
fprintf(stdout, "/aspectratio %s def\n", optarg);
|
|
|
344 |
break;
|
|
|
345 |
|
|
|
346 |
case 'c': /* copies */
|
|
|
347 |
copies = atoi(optarg);
|
|
|
348 |
fprintf(stdout, "/#copies %s def\n", optarg);
|
|
|
349 |
break;
|
|
|
350 |
|
|
|
351 |
case 'f': /* new font */
|
|
|
352 |
fontname = get_font(optarg);
|
|
|
353 |
fprintf(stdout, "/font /%s def\n", fontname);
|
|
|
354 |
break;
|
|
|
355 |
|
|
|
356 |
case 'm': /* magnification */
|
|
|
357 |
fprintf(stdout, "/magnification %s def\n", optarg);
|
|
|
358 |
break;
|
|
|
359 |
|
|
|
360 |
case 'n': /* forms per page */
|
|
|
361 |
formsperpage = atoi(optarg);
|
|
|
362 |
fprintf(stdout, "%s %s\n", FORMSPERPAGE, optarg);
|
|
|
363 |
fprintf(stdout, "/formsperpage %s def\n", optarg);
|
|
|
364 |
break;
|
|
|
365 |
|
|
|
366 |
case 'o': /* output page list */
|
|
|
367 |
out_list(optarg);
|
|
|
368 |
break;
|
|
|
369 |
|
|
|
370 |
case 'p': /* landscape or portrait mode */
|
|
|
371 |
if ( *optarg == 'l' )
|
|
|
372 |
fprintf(stdout, "/landscape true def\n");
|
|
|
373 |
else fprintf(stdout, "/landscape false def\n");
|
|
|
374 |
break;
|
|
|
375 |
|
|
|
376 |
case 'w': /* line width */
|
|
|
377 |
fprintf(stdout, "/linewidth %s def\n", optarg);
|
|
|
378 |
break;
|
|
|
379 |
|
|
|
380 |
case 'x': /* shift horizontally */
|
|
|
381 |
fprintf(stdout, "/xoffset %s def\n", optarg);
|
|
|
382 |
break;
|
|
|
383 |
|
|
|
384 |
case 'y': /* and vertically on the page */
|
|
|
385 |
fprintf(stdout, "/yoffset %s def\n", optarg);
|
|
|
386 |
break;
|
|
|
387 |
|
|
|
388 |
case 'A': /* force job accounting */
|
|
|
389 |
case 'J':
|
|
|
390 |
if ( (fp_acct = fopen(optarg, "a")) == NULL )
|
|
|
391 |
error(FATAL, "can't open accounting file %s", optarg);
|
|
|
392 |
break;
|
|
|
393 |
|
|
|
394 |
case 'C': /* copy file straight to output */
|
|
|
395 |
if ( cat(optarg) == FALSE )
|
|
|
396 |
error(FATAL, "can't read %s", optarg);
|
|
|
397 |
break;
|
|
|
398 |
|
|
|
399 |
case 'E': /* text font encoding */
|
|
|
400 |
fontencoding = optarg;
|
|
|
401 |
break;
|
|
|
402 |
|
|
|
403 |
case 'L': /* Postscript prologue file */
|
|
|
404 |
prologue = optarg;
|
|
|
405 |
break;
|
|
|
406 |
|
|
|
407 |
case 'P': /* PostScript pass through */
|
|
|
408 |
fprintf(stdout, "%s\n", optarg);
|
|
|
409 |
break;
|
|
|
410 |
|
|
|
411 |
case 'R': /* special global or page level request */
|
|
|
412 |
saverequest(optarg);
|
|
|
413 |
break;
|
|
|
414 |
|
|
|
415 |
case 'D': /* debug flag */
|
|
|
416 |
debug = ON;
|
|
|
417 |
break;
|
|
|
418 |
|
|
|
419 |
case 'I': /* ignore FATAL errors */
|
|
|
420 |
ignore = ON;
|
|
|
421 |
break;
|
|
|
422 |
|
|
|
423 |
case '?': /* don't know the option */
|
|
|
424 |
error(FATAL, "");
|
|
|
425 |
break;
|
|
|
426 |
|
|
|
427 |
default: /* don't know what to do for ch */
|
|
|
428 |
error(FATAL, "missing case for option %c", ch);
|
|
|
429 |
break;
|
|
|
430 |
} /* End switch */
|
|
|
431 |
} /* End while */
|
|
|
432 |
|
|
|
433 |
argc -= optind; /* get ready for non-option args */
|
|
|
434 |
argv += optind;
|
|
|
435 |
|
|
|
436 |
} /* End of options */
|
|
|
437 |
|
|
|
438 |
/*****************************************************************************/
|
|
|
439 |
|
|
|
440 |
char *get_font(name)
|
|
|
441 |
|
|
|
442 |
char *name; /* name the user asked for */
|
|
|
443 |
|
|
|
444 |
{
|
|
|
445 |
|
|
|
446 |
int i; /* for looking through fontmap[] */
|
|
|
447 |
|
|
|
448 |
/*
|
|
|
449 |
*
|
|
|
450 |
* Called from options() to map a user's font name into a legal PostScript name.
|
|
|
451 |
* If the lookup fails *name is returned to the caller. That should let you choose
|
|
|
452 |
* any PostScript font.
|
|
|
453 |
*
|
|
|
454 |
*/
|
|
|
455 |
|
|
|
456 |
for ( i = 0; fontmap[i].name != NULL; i++ )
|
|
|
457 |
if ( strcmp(name, fontmap[i].name) == 0 )
|
|
|
458 |
return(fontmap[i].val);
|
|
|
459 |
|
|
|
460 |
return(name);
|
|
|
461 |
|
|
|
462 |
} /* End of get_font */
|
|
|
463 |
|
|
|
464 |
/*****************************************************************************/
|
|
|
465 |
|
|
|
466 |
setup()
|
|
|
467 |
|
|
|
468 |
{
|
|
|
469 |
|
|
|
470 |
/*
|
|
|
471 |
*
|
|
|
472 |
* Handles things that must be done after the options are read but before the
|
|
|
473 |
* input files are processed.
|
|
|
474 |
*
|
|
|
475 |
*/
|
|
|
476 |
|
|
|
477 |
writerequest(0, stdout); /* global requests eg. manual feed */
|
|
|
478 |
setencoding(fontencoding);
|
|
|
479 |
fprintf(stdout, "setup\n");
|
|
|
480 |
|
|
|
481 |
if ( formsperpage > 1 ) {
|
|
|
482 |
if ( cat(formfile) == FALSE )
|
|
|
483 |
error(FATAL, "can't read %s", formfile);
|
|
|
484 |
fprintf(stdout, "%d setupforms\n", formsperpage);
|
|
|
485 |
} /* End if */
|
|
|
486 |
|
|
|
487 |
fprintf(stdout, "%s", ENDSETUP);
|
|
|
488 |
|
|
|
489 |
} /* End of setup */
|
|
|
490 |
|
|
|
491 |
/*****************************************************************************/
|
|
|
492 |
|
|
|
493 |
arguments()
|
|
|
494 |
|
|
|
495 |
{
|
|
|
496 |
|
|
|
497 |
/*
|
|
|
498 |
*
|
|
|
499 |
* Makes sure all the non-option command line options are processed. If we get
|
|
|
500 |
* here and there aren't any arguments left, or if '-' is one of the input files
|
|
|
501 |
* we'll process stdin.
|
|
|
502 |
*
|
|
|
503 |
*/
|
|
|
504 |
|
|
|
505 |
if ( argc < 1 )
|
|
|
506 |
conv();
|
|
|
507 |
else
|
|
|
508 |
while ( argc > 0 ) {
|
|
|
509 |
if ( strcmp(*argv, "-") == 0 )
|
|
|
510 |
fp_in = stdin;
|
|
|
511 |
else if ( (fp_in = fopen(*argv, "r")) == NULL )
|
|
|
512 |
error(FATAL, "can't open %s", *argv);
|
|
|
513 |
conv();
|
|
|
514 |
if ( fp_in != stdin )
|
|
|
515 |
fclose(fp_in);
|
|
|
516 |
argc--;
|
|
|
517 |
argv++;
|
|
|
518 |
} /* End while */
|
|
|
519 |
|
|
|
520 |
} /* End of arguments */
|
|
|
521 |
|
|
|
522 |
/*****************************************************************************/
|
|
|
523 |
|
|
|
524 |
done()
|
|
|
525 |
|
|
|
526 |
{
|
|
|
527 |
|
|
|
528 |
/*
|
|
|
529 |
*
|
|
|
530 |
* Finished with the last input file, so mark the end of the pages, make sure the
|
|
|
531 |
* last page is printed, and restore the initial environment.
|
|
|
532 |
*
|
|
|
533 |
*/
|
|
|
534 |
|
|
|
535 |
fprintf(stdout, "%s", TRAILER);
|
|
|
536 |
fprintf(stdout, "done\n");
|
|
|
537 |
fprintf(stdout, "%s %s\n", DOCUMENTFONTS, fontname);
|
|
|
538 |
fprintf(stdout, "%s %d\n", PAGES, printed);
|
|
|
539 |
|
|
|
540 |
} /* End of done */
|
|
|
541 |
|
|
|
542 |
/*****************************************************************************/
|
|
|
543 |
|
|
|
544 |
account()
|
|
|
545 |
|
|
|
546 |
{
|
|
|
547 |
|
|
|
548 |
/*
|
|
|
549 |
*
|
|
|
550 |
* Writes an accounting record to *fp_acct, provided it's not NULL.
|
|
|
551 |
*
|
|
|
552 |
*/
|
|
|
553 |
|
|
|
554 |
if ( fp_acct != NULL )
|
|
|
555 |
fprintf(fp_acct, " print %d\n copies %d\n", printed, copies);
|
|
|
556 |
|
|
|
557 |
} /* End of account */
|
|
|
558 |
|
|
|
559 |
/*****************************************************************************/
|
|
|
560 |
|
|
|
561 |
conv()
|
|
|
562 |
|
|
|
563 |
{
|
|
|
564 |
|
|
|
565 |
int ch; /* next input character */
|
|
|
566 |
|
|
|
567 |
/*
|
|
|
568 |
*
|
|
|
569 |
* Controls the conversion of BGI files into PostScript. Not everything has been
|
|
|
570 |
* implemented, but what's been done should be good enough for our purposes.
|
|
|
571 |
*
|
|
|
572 |
*/
|
|
|
573 |
|
|
|
574 |
redirect(-1); /* get ready for the first page */
|
|
|
575 |
bgimode = 0;
|
|
|
576 |
formfeed();
|
|
|
577 |
|
|
|
578 |
while ( (ch = get_char()) != EOF ) {
|
|
|
579 |
switch ( ch ) {
|
|
|
580 |
case BRCHAR: /* rotated character mode */
|
|
|
581 |
bgimode = ch;
|
|
|
582 |
text(90);
|
|
|
583 |
break;
|
|
|
584 |
|
|
|
585 |
case BCHAR: /* graphical character mode */
|
|
|
586 |
bgimode = ch;
|
|
|
587 |
text(0);
|
|
|
588 |
break;
|
|
|
589 |
|
|
|
590 |
case BGRAPH: /* graphical master mode */
|
|
|
591 |
bgimode = ch;
|
|
|
592 |
break;
|
|
|
593 |
|
|
|
594 |
case BSUB: /* subroutine definition */
|
|
|
595 |
subr_def();
|
|
|
596 |
break;
|
|
|
597 |
|
|
|
598 |
case BRET: /* end of subroutine */
|
|
|
599 |
subr_end();
|
|
|
600 |
break;
|
|
|
601 |
|
|
|
602 |
case BCALL: /* subroutine call */
|
|
|
603 |
subr_call();
|
|
|
604 |
break;
|
|
|
605 |
|
|
|
606 |
case BEND: /* end display - page */
|
|
|
607 |
formfeed();
|
|
|
608 |
break;
|
|
|
609 |
|
|
|
610 |
case BERASE: /* erase - shouldn't be used */
|
|
|
611 |
error(FATAL, "BGI erase opcode obsolete");
|
|
|
612 |
break;
|
|
|
613 |
|
|
|
614 |
case BREP: /* repeat */
|
|
|
615 |
error(FATAL, "Repeat not implemented");
|
|
|
616 |
repeat();
|
|
|
617 |
break;
|
|
|
618 |
|
|
|
619 |
case BSETX: /* new x coordinate */
|
|
|
620 |
hgoto(get_int(0));
|
|
|
621 |
break;
|
|
|
622 |
|
|
|
623 |
case BSETY: /* new y coordinate */
|
|
|
624 |
vgoto(get_int(0));
|
|
|
625 |
break;
|
|
|
626 |
|
|
|
627 |
case BSETXY: /* new x and y coordinates */
|
|
|
628 |
hgoto(get_int(0));
|
|
|
629 |
vgoto(get_int(0));
|
|
|
630 |
break;
|
|
|
631 |
|
|
|
632 |
case BINTEN: /* mark the current point */
|
|
|
633 |
fprintf(fp_out, "%d %d p\n", hpos, vpos);
|
|
|
634 |
break;
|
|
|
635 |
|
|
|
636 |
case BVISX: /* visible x */
|
|
|
637 |
vector(X_COORD, VISIBLE);
|
|
|
638 |
break;
|
|
|
639 |
|
|
|
640 |
case BINVISX: /* invisible x */
|
|
|
641 |
vector(X_COORD, INVISIBLE);
|
|
|
642 |
break;
|
|
|
643 |
|
|
|
644 |
case BVISY: /* visible y */
|
|
|
645 |
vector(Y_COORD, VISIBLE);
|
|
|
646 |
break;
|
|
|
647 |
|
|
|
648 |
case BINVISY: /* invisible y */
|
|
|
649 |
vector(Y_COORD, INVISIBLE);
|
|
|
650 |
break;
|
|
|
651 |
|
|
|
652 |
case BVEC: /* arbitrary vector */
|
|
|
653 |
vector(LONGVECTOR, VISIBLE);
|
|
|
654 |
break;
|
|
|
655 |
|
|
|
656 |
case BSVEC: /* short vector */
|
|
|
657 |
vector(SHORTVECTOR, VISIBLE);
|
|
|
658 |
break;
|
|
|
659 |
|
|
|
660 |
case BRECT: /* draw rectangle */
|
|
|
661 |
rectangle(OUTLINE);
|
|
|
662 |
break;
|
|
|
663 |
|
|
|
664 |
case BPOINT1: /* point plot 1 */
|
|
|
665 |
case BPOINT: /* point plot 2 */
|
|
|
666 |
point_plot(ch, get_char());
|
|
|
667 |
break;
|
|
|
668 |
|
|
|
669 |
case BLINE: /* line plot */
|
|
|
670 |
line_plot();
|
|
|
671 |
break;
|
|
|
672 |
|
|
|
673 |
case BLTY: /* line type */
|
|
|
674 |
fprintf(fp_out, "%s l\n", styles[get_data()]);
|
|
|
675 |
break;
|
|
|
676 |
|
|
|
677 |
case BARC: /* circular arc */
|
|
|
678 |
arc(OUTLINE);
|
|
|
679 |
break;
|
|
|
680 |
|
|
|
681 |
case BFARC: /* filled circle */
|
|
|
682 |
arc(FILL);
|
|
|
683 |
break;
|
|
|
684 |
|
|
|
685 |
case BFRECT: /* filled rectangle */
|
|
|
686 |
rectangle(FILL);
|
|
|
687 |
break;
|
|
|
688 |
|
|
|
689 |
case BRASRECT: /* raster rectangle */
|
|
|
690 |
error(FATAL, "Raster Rectangle not implemented");
|
|
|
691 |
break;
|
|
|
692 |
|
|
|
693 |
case BCOL: /* select color */
|
|
|
694 |
set_color(get_data());
|
|
|
695 |
break;
|
|
|
696 |
|
|
|
697 |
case BFTRAPH: /* filled trapezoid */
|
|
|
698 |
trapezoid();
|
|
|
699 |
break;
|
|
|
700 |
|
|
|
701 |
case BPAT: /* pattern for area filling */
|
|
|
702 |
pattern();
|
|
|
703 |
break;
|
|
|
704 |
|
|
|
705 |
case BCSZ: /* change BGI character 'size' */
|
|
|
706 |
setsize(get_data());
|
|
|
707 |
break;
|
|
|
708 |
|
|
|
709 |
case BNOISE: /* from bad file format */
|
|
|
710 |
break;
|
|
|
711 |
|
|
|
712 |
default: /* don't recognize the code */
|
|
|
713 |
error(FATAL, "bad BGI command %d (0%o)", ch, ch);
|
|
|
714 |
break;
|
|
|
715 |
} /* End switch */
|
|
|
716 |
|
|
|
717 |
if ( debug == ON )
|
|
|
718 |
fprintf(stderr, "\n");
|
|
|
719 |
} /* End while */
|
|
|
720 |
|
|
|
721 |
formfeed(); /* in case BEND was missing */
|
|
|
722 |
|
|
|
723 |
} /* End of conv */
|
|
|
724 |
|
|
|
725 |
/*****************************************************************************/
|
|
|
726 |
|
|
|
727 |
hgoto(n)
|
|
|
728 |
|
|
|
729 |
int n; /* new horizontal position */
|
|
|
730 |
|
|
|
731 |
{
|
|
|
732 |
|
|
|
733 |
/*
|
|
|
734 |
*
|
|
|
735 |
* Sets the current BGI horizontal position to n.
|
|
|
736 |
*
|
|
|
737 |
*/
|
|
|
738 |
|
|
|
739 |
hpos = n;
|
|
|
740 |
|
|
|
741 |
} /* End of hgoto */
|
|
|
742 |
|
|
|
743 |
/*****************************************************************************/
|
|
|
744 |
|
|
|
745 |
vgoto(n)
|
|
|
746 |
|
|
|
747 |
int n; /* move to this vertical position */
|
|
|
748 |
|
|
|
749 |
{
|
|
|
750 |
|
|
|
751 |
/*
|
|
|
752 |
*
|
|
|
753 |
* Sets the absolute vertical position to n.
|
|
|
754 |
*
|
|
|
755 |
*/
|
|
|
756 |
|
|
|
757 |
vpos = n;
|
|
|
758 |
|
|
|
759 |
} /* End of vgoto */
|
|
|
760 |
|
|
|
761 |
/*****************************************************************************/
|
|
|
762 |
|
|
|
763 |
setsize(n)
|
|
|
764 |
|
|
|
765 |
int n; /* BGI size - just a grid separation */
|
|
|
766 |
|
|
|
767 |
{
|
|
|
768 |
|
|
|
769 |
/*
|
|
|
770 |
*
|
|
|
771 |
* Called when we're supposed to change the BGI character size to n. The BGI
|
|
|
772 |
* size is the grid separation in a 5 by 7 array in which characters are assumed
|
|
|
773 |
* to be built.
|
|
|
774 |
*
|
|
|
775 |
*/
|
|
|
776 |
|
|
|
777 |
bgisize = n;
|
|
|
778 |
linespace = LINESPACE(bgisize);
|
|
|
779 |
|
|
|
780 |
fprintf(fp_out, "%d f\n", bgisize);
|
|
|
781 |
|
|
|
782 |
if ( debug == ON )
|
|
|
783 |
fprintf(stderr, "BGI size = %d\n", n);
|
|
|
784 |
|
|
|
785 |
} /* End of setsize */
|
|
|
786 |
|
|
|
787 |
/*****************************************************************************/
|
|
|
788 |
|
|
|
789 |
repeat()
|
|
|
790 |
|
|
|
791 |
{
|
|
|
792 |
|
|
|
793 |
int count; /* repeat this many times */
|
|
|
794 |
int ch; /* next input character */
|
|
|
795 |
|
|
|
796 |
/*
|
|
|
797 |
*
|
|
|
798 |
* Haven't implemented repeats, although it wouldn't be difficult. Apparently it's
|
|
|
799 |
* not used by any graphics packages that generate BGI.
|
|
|
800 |
*
|
|
|
801 |
*/
|
|
|
802 |
|
|
|
803 |
count = get_int(); /* get the repeat count */
|
|
|
804 |
|
|
|
805 |
while ( (ch = get_char()) != EOF && ch != BENDR ) ;
|
|
|
806 |
|
|
|
807 |
} /* End of repeat */
|
|
|
808 |
|
|
|
809 |
/*****************************************************************************/
|
|
|
810 |
|
|
|
811 |
text(angle)
|
|
|
812 |
|
|
|
813 |
int angle; /* either 0 or 90 degrees */
|
|
|
814 |
|
|
|
815 |
{
|
|
|
816 |
|
|
|
817 |
int ch; /* next character from file *fp_in */
|
|
|
818 |
|
|
|
819 |
/*
|
|
|
820 |
*
|
|
|
821 |
* Called from conv() after we've entered one of the graphical character modes.
|
|
|
822 |
* Characters are read from the input file and printed until the next mode change
|
|
|
823 |
* opcode is found (or until EOF). angle will be 90 for rotated character mode
|
|
|
824 |
* and 0 otherwise.
|
|
|
825 |
*
|
|
|
826 |
*
|
|
|
827 |
*/
|
|
|
828 |
|
|
|
829 |
fprintf(fp_out, "%d %d %d(", angle, hpos, vpos);
|
|
|
830 |
|
|
|
831 |
while ( (ch = get_char()) != EOF ) {
|
|
|
832 |
if ( ch == BGRAPH || ch == BCHAR || ch == BRCHAR ) {
|
|
|
833 |
ungetc(ch, fp_in);
|
|
|
834 |
position--;
|
|
|
835 |
break;
|
|
|
836 |
} /* End if */
|
|
|
837 |
|
|
|
838 |
switch ( ch ) {
|
|
|
839 |
case '\012':
|
|
|
840 |
vgoto(vpos - linespace);
|
|
|
841 |
|
|
|
842 |
case '\015':
|
|
|
843 |
hgoto(0);
|
|
|
844 |
fprintf(fp_out, ")t\n%d %d %d(", angle, hpos, vpos);
|
|
|
845 |
break;
|
|
|
846 |
|
|
|
847 |
case '(':
|
|
|
848 |
case ')':
|
|
|
849 |
case '\\':
|
|
|
850 |
putc('\\', fp_out);
|
|
|
851 |
|
|
|
852 |
default:
|
|
|
853 |
if ( isascii(ch) && isprint(ch) )
|
|
|
854 |
putc(ch, fp_out);
|
|
|
855 |
else fprintf(fp_out, "\\%.3o", ch & 0377);
|
|
|
856 |
break;
|
|
|
857 |
} /* End switch */
|
|
|
858 |
} /* End while */
|
|
|
859 |
|
|
|
860 |
fprintf(fp_out, ") t\n");
|
|
|
861 |
|
|
|
862 |
} /* End of text */
|
|
|
863 |
|
|
|
864 |
/*****************************************************************************/
|
|
|
865 |
|
|
|
866 |
formfeed()
|
|
|
867 |
|
|
|
868 |
{
|
|
|
869 |
|
|
|
870 |
int ch; /* repeat count for this page */
|
|
|
871 |
|
|
|
872 |
/*
|
|
|
873 |
*
|
|
|
874 |
* Does whatever is needed to print the last page and get ready for the next one.
|
|
|
875 |
* It's called, from conv(), after a BEND code is processed. I'm ignoring the
|
|
|
876 |
* copy count that's expected to follow each page.
|
|
|
877 |
*
|
|
|
878 |
*/
|
|
|
879 |
|
|
|
880 |
if ( bgimode == BGRAPH && (ch = get_char()) != EOF && ! (ch & MSB) ) {
|
|
|
881 |
ungetc(ch, fp_in);
|
|
|
882 |
position--;
|
|
|
883 |
} /* End if */
|
|
|
884 |
|
|
|
885 |
if ( fp_out == stdout ) /* count the last page */
|
|
|
886 |
printed++;
|
|
|
887 |
|
|
|
888 |
fprintf(fp_out, "cleartomark\n");
|
|
|
889 |
fprintf(fp_out, "showpage\n");
|
|
|
890 |
fprintf(fp_out, "saveobj restore\n");
|
|
|
891 |
fprintf(fp_out, "%s %d %d\n", ENDPAGE, page, printed);
|
|
|
892 |
|
|
|
893 |
while ( (ch = get_char()) == 0 ) ; /* skip any NULL characters */
|
|
|
894 |
ungetc(ch, fp_in);
|
|
|
895 |
position--;
|
|
|
896 |
|
|
|
897 |
if ( ungetc(getc(fp_in), fp_in) == EOF )
|
|
|
898 |
redirect(-1);
|
|
|
899 |
else redirect(++page);
|
|
|
900 |
|
|
|
901 |
fprintf(fp_out, "%s %d %d\n", PAGE, page, printed+1);
|
|
|
902 |
fprintf(fp_out, "/saveobj save def\n");
|
|
|
903 |
fprintf(fp_out, "mark\n");
|
|
|
904 |
writerequest(printed+1, fp_out);
|
|
|
905 |
fprintf(fp_out, "%d pagesetup\n", printed+1);
|
|
|
906 |
|
|
|
907 |
setsize(bgisize);
|
|
|
908 |
hpos = vpos = 0;
|
|
|
909 |
|
|
|
910 |
} /* End of formfeed */
|
|
|
911 |
|
|
|
912 |
/*****************************************************************************/
|
|
|
913 |
|
|
|
914 |
subr_def()
|
|
|
915 |
|
|
|
916 |
{
|
|
|
917 |
|
|
|
918 |
/*
|
|
|
919 |
*
|
|
|
920 |
* Starts a subroutine definition. All subroutines are defined as PostScript
|
|
|
921 |
* procedures that begin with the character S and end with the subroutine's id
|
|
|
922 |
* (a number between 0 and 63 - I guess). The primary, and perhaps only use of
|
|
|
923 |
* subroutines is in special color plots produced by several graphics libraries,
|
|
|
924 |
* and even there it's not all that common. I've also chosen not to worry about
|
|
|
925 |
* nested subroutine definitions - that would certainly be overkill!
|
|
|
926 |
*
|
|
|
927 |
* All subroutines set up their own (translated) coordinate system, do their work
|
|
|
928 |
* in that system, and restore things when they exit. To make everything work
|
|
|
929 |
* properly we save the current point (in shpos and svpos), set our position to
|
|
|
930 |
* (0, 0), and restore things at the end of the subroutine definition. That means
|
|
|
931 |
* hpos and vpos measure the relative displacement after a subroutine returns, and
|
|
|
932 |
* we save those values in the displacement[] array. The displacements are used
|
|
|
933 |
* (in subr_call()) to properly adjust our position after each subroutine call,
|
|
|
934 |
* and all subroutines are called with the current x and y coordinates on top of
|
|
|
935 |
* the stack.
|
|
|
936 |
*
|
|
|
937 |
*/
|
|
|
938 |
|
|
|
939 |
if ( in_subr == TRUE ) /* a nested subroutine definition?? */
|
|
|
940 |
error(FATAL, "can't handle nested subroutine definitions");
|
|
|
941 |
|
|
|
942 |
if ( (subr_id = get_data()) == EOF )
|
|
|
943 |
error(FATAL, "missing subroutine identifier");
|
|
|
944 |
|
|
|
945 |
if ( in_global == FALSE ) { /* just used to reduce file size some */
|
|
|
946 |
fprintf(fp_out, "cleartomark\n");
|
|
|
947 |
fprintf(fp_out, "saveobj restore\n");
|
|
|
948 |
fprintf(fp_out, "%s", BEGINGLOBAL);
|
|
|
949 |
in_global = TRUE;
|
|
|
950 |
} /* End if */
|
|
|
951 |
|
|
|
952 |
fprintf(fp_out, "/S%d {\n", subr_id);
|
|
|
953 |
fprintf(fp_out, "gsave translate\n");
|
|
|
954 |
|
|
|
955 |
shpos = hpos; /* save our current position */
|
|
|
956 |
svpos = vpos;
|
|
|
957 |
|
|
|
958 |
hgoto(0); /* start at the origin */
|
|
|
959 |
vgoto(0);
|
|
|
960 |
|
|
|
961 |
in_subr = TRUE; /* in a subroutine definition */
|
|
|
962 |
|
|
|
963 |
} /* End of subr_def */
|
|
|
964 |
|
|
|
965 |
/*****************************************************************************/
|
|
|
966 |
|
|
|
967 |
subr_end()
|
|
|
968 |
|
|
|
969 |
{
|
|
|
970 |
|
|
|
971 |
int ch; /* for looking at next opcode */
|
|
|
972 |
|
|
|
973 |
/*
|
|
|
974 |
*
|
|
|
975 |
* Handles stuff needed at the end of each subroutine. Want to remember the change
|
|
|
976 |
* in horizontal and vertical positions for each subroutine so we can adjust our
|
|
|
977 |
* position after each call - just in case. The current position was set to (0, 0)
|
|
|
978 |
* before we started the subroutine definition, so when we get here hpos and vpos
|
|
|
979 |
* are the relative displacements after the subroutine is called. They're saved in
|
|
|
980 |
* the displacement[] array and used to adjust the current position when we return
|
|
|
981 |
* from a subroutine.
|
|
|
982 |
*
|
|
|
983 |
*/
|
|
|
984 |
|
|
|
985 |
if ( in_subr == FALSE ) /* not in a subroutine definition?? */
|
|
|
986 |
error(FATAL, "subroutine end without corresponding start");
|
|
|
987 |
|
|
|
988 |
fprintf(fp_out, "grestore\n");
|
|
|
989 |
fprintf(fp_out, "} def\n");
|
|
|
990 |
|
|
|
991 |
if ( in_global == TRUE && (ch = get_char()) != BSUB ) {
|
|
|
992 |
fprintf(fp_out, "%s", ENDGLOBAL);
|
|
|
993 |
fprintf(fp_out, "/saveobj save def\n");
|
|
|
994 |
fprintf(fp_out, "mark\n");
|
|
|
995 |
in_global = FALSE;
|
|
|
996 |
} /* End if */
|
|
|
997 |
|
|
|
998 |
ungetc(ch, fp_in); /* put back the next opcode */
|
|
|
999 |
|
|
|
1000 |
displacement[subr_id].dx = hpos;
|
|
|
1001 |
displacement[subr_id].dy = vpos;
|
|
|
1002 |
|
|
|
1003 |
hgoto(shpos); /* back to where we started */
|
|
|
1004 |
vgoto(svpos);
|
|
|
1005 |
|
|
|
1006 |
in_subr = FALSE; /* done with the definition */
|
|
|
1007 |
|
|
|
1008 |
} /* End of subr_end */
|
|
|
1009 |
|
|
|
1010 |
/*****************************************************************************/
|
|
|
1011 |
|
|
|
1012 |
subr_call()
|
|
|
1013 |
|
|
|
1014 |
{
|
|
|
1015 |
|
|
|
1016 |
int ch; /* next byte from *fp_in */
|
|
|
1017 |
int id; /* subroutine id if ch wasn't an opcode */
|
|
|
1018 |
|
|
|
1019 |
/*
|
|
|
1020 |
*
|
|
|
1021 |
* Handles subroutine calls. Everything that follows the BCALL opcode (up to the
|
|
|
1022 |
* next opcode) is taken as a subroutine identifier - thus the loop that generates
|
|
|
1023 |
* the subroutine calls.
|
|
|
1024 |
*
|
|
|
1025 |
*/
|
|
|
1026 |
|
|
|
1027 |
while ( (ch = get_char()) != EOF && (ch & MSB) ) {
|
|
|
1028 |
id = ch & DMASK;
|
|
|
1029 |
fprintf(fp_out, "%d %d S%d\n", hpos, vpos, id);
|
|
|
1030 |
|
|
|
1031 |
hgoto(hpos + displacement[id].dx); /* adjust our position */
|
|
|
1032 |
vgoto(vpos + displacement[id].dy);
|
|
|
1033 |
} /* End while */
|
|
|
1034 |
|
|
|
1035 |
ungetc(ch, fp_in);
|
|
|
1036 |
|
|
|
1037 |
} /* End of subr_call */
|
|
|
1038 |
|
|
|
1039 |
/*****************************************************************************/
|
|
|
1040 |
|
|
|
1041 |
vector(var, mode)
|
|
|
1042 |
|
|
|
1043 |
int var; /* coordinate that varies next? */
|
|
|
1044 |
int mode; /* VISIBLE or INVISIBLE vectors */
|
|
|
1045 |
|
|
|
1046 |
{
|
|
|
1047 |
|
|
|
1048 |
int ch; /* next character from *fp_in */
|
|
|
1049 |
int x, y; /* line drawn to this point */
|
|
|
1050 |
int count = 0; /* number of points so far */
|
|
|
1051 |
|
|
|
1052 |
/*
|
|
|
1053 |
*
|
|
|
1054 |
* Handles plotting of all types of BGI vectors. If it's a manhattan vector var
|
|
|
1055 |
* specifies which coordinate will be changed by the next number in the input
|
|
|
1056 |
* file.
|
|
|
1057 |
*
|
|
|
1058 |
*/
|
|
|
1059 |
|
|
|
1060 |
x = hpos; /* set up the first point */
|
|
|
1061 |
y = vpos;
|
|
|
1062 |
|
|
|
1063 |
while ( (ch = get_char()) != EOF && ch & MSB ) {
|
|
|
1064 |
if ( var == X_COORD ) /* next length is change in x */
|
|
|
1065 |
x += get_int(ch);
|
|
|
1066 |
else if ( var == Y_COORD ) /* it's the change in y */
|
|
|
1067 |
y += get_int(ch);
|
|
|
1068 |
else if ( var == LONGVECTOR ) { /* long vector */
|
|
|
1069 |
x += get_int(ch);
|
|
|
1070 |
y += get_int(0);
|
|
|
1071 |
} else { /* must be a short vector */
|
|
|
1072 |
x += ((ch & MSBMAG) * ((ch & SGNB) ? -1 : 1));
|
|
|
1073 |
y += (((ch = get_data()) & MSBMAG) * ((ch & SGNB) ? -1 : 1));
|
|
|
1074 |
} /* End else */
|
|
|
1075 |
|
|
|
1076 |
if ( mode == VISIBLE ) { /* draw the line segment */
|
|
|
1077 |
fprintf(fp_out, "%d %d\n", hpos - x, vpos - y);
|
|
|
1078 |
count++;
|
|
|
1079 |
} /* End if */
|
|
|
1080 |
|
|
|
1081 |
hgoto(x); /* adjust the current BGI position */
|
|
|
1082 |
vgoto(y);
|
|
|
1083 |
|
|
|
1084 |
if ( var == X_COORD ) /* vertical length comes next */
|
|
|
1085 |
var = Y_COORD;
|
|
|
1086 |
else if ( var == Y_COORD ) /* change horizontal next */
|
|
|
1087 |
var = X_COORD;
|
|
|
1088 |
} /* End while */
|
|
|
1089 |
|
|
|
1090 |
if ( count > 0 )
|
|
|
1091 |
fprintf(fp_out, "%d %d v\n", hpos, vpos);
|
|
|
1092 |
|
|
|
1093 |
ungetc(ch, fp_in); /* it wasn't part of the vector */
|
|
|
1094 |
position--;
|
|
|
1095 |
|
|
|
1096 |
} /* End of vector */
|
|
|
1097 |
|
|
|
1098 |
/*****************************************************************************/
|
|
|
1099 |
|
|
|
1100 |
rectangle(mode)
|
|
|
1101 |
|
|
|
1102 |
int mode; /* FILL or OUTLINE the rectangle */
|
|
|
1103 |
|
|
|
1104 |
{
|
|
|
1105 |
|
|
|
1106 |
int deltax; /* displacement for horizontal side */
|
|
|
1107 |
int deltay; /* same but for vertical sides */
|
|
|
1108 |
|
|
|
1109 |
/*
|
|
|
1110 |
*
|
|
|
1111 |
* Draws a rectangle and either outlines or fills it, depending on the value of
|
|
|
1112 |
* mode. Would be clearer, and perhaps better, if {stroke} or {fill} were put on
|
|
|
1113 |
* the stack instead of 0 or 1. R could then define the path and just do an exec
|
|
|
1114 |
* to fill or stroke it.
|
|
|
1115 |
*
|
|
|
1116 |
*/
|
|
|
1117 |
|
|
|
1118 |
deltax = get_int(0); /* get the height and width */
|
|
|
1119 |
deltay = get_int(0);
|
|
|
1120 |
|
|
|
1121 |
if ( mode == OUTLINE )
|
|
|
1122 |
fprintf(fp_out, "0 %d %d %d %d R\n", deltax, deltay, hpos, vpos);
|
|
|
1123 |
else fprintf(fp_out, "1 %d %d %d %d R\n", deltax, deltay, hpos, vpos);
|
|
|
1124 |
|
|
|
1125 |
} /* End of rectangle */
|
|
|
1126 |
|
|
|
1127 |
/*****************************************************************************/
|
|
|
1128 |
|
|
|
1129 |
trapezoid()
|
|
|
1130 |
|
|
|
1131 |
{
|
|
|
1132 |
|
|
|
1133 |
int kind; /* which sides are parallel */
|
|
|
1134 |
int d[6]; /* true displacements - depends on kind */
|
|
|
1135 |
|
|
|
1136 |
/*
|
|
|
1137 |
*
|
|
|
1138 |
* Handles filled trapeziods. A data byte of 0101 following the opcode means the
|
|
|
1139 |
* horizontal sides are parallel, 0102 means the vertical sides are parallel.
|
|
|
1140 |
* Filling is handled by eofill so we don't need to get things in the right order.
|
|
|
1141 |
*
|
|
|
1142 |
*/
|
|
|
1143 |
|
|
|
1144 |
kind = get_data();
|
|
|
1145 |
|
|
|
1146 |
d[0] = get_int(0);
|
|
|
1147 |
d[1] = 0;
|
|
|
1148 |
d[2] = get_int(0);
|
|
|
1149 |
d[3] = get_int(0);
|
|
|
1150 |
d[4] = get_int(0);
|
|
|
1151 |
d[5] = 0;
|
|
|
1152 |
|
|
|
1153 |
if ( kind == 2 ) { /* parallel sides are vertical */
|
|
|
1154 |
d[1] = d[0];
|
|
|
1155 |
d[0] = 0;
|
|
|
1156 |
d[5] = d[4];
|
|
|
1157 |
d[4] = 0;
|
|
|
1158 |
} /* End if */
|
|
|
1159 |
|
|
|
1160 |
fprintf(fp_out, "%d %d %d %d %d %d %d %d T\n", d[4], d[5], d[2], d[3], d[0], d[1], hpos, vpos);
|
|
|
1161 |
|
|
|
1162 |
} /* End of trapezoid */
|
|
|
1163 |
|
|
|
1164 |
/*****************************************************************************/
|
|
|
1165 |
|
|
|
1166 |
point_plot(mode, ch)
|
|
|
1167 |
|
|
|
1168 |
int mode; /* plotting mode BPOINT or BPOINT1 */
|
|
|
1169 |
int ch; /* will be placed at the points */
|
|
|
1170 |
|
|
|
1171 |
{
|
|
|
1172 |
|
|
|
1173 |
int c; /* next character from input file */
|
|
|
1174 |
int x, y; /* ch gets put here next */
|
|
|
1175 |
int deltax; /* x increment for BPOINT1 mode */
|
|
|
1176 |
|
|
|
1177 |
/*
|
|
|
1178 |
*
|
|
|
1179 |
* The two point plot modes are used to place a character at selected points. The
|
|
|
1180 |
* difference in the two modes, namely BPOINT and BPOINT1, is the way we get the
|
|
|
1181 |
* coordinates of the next point. In BPOINT1 the two bytes immediately following
|
|
|
1182 |
* ch select a constant horizontal change, while both coordinates are given for
|
|
|
1183 |
* all points in BPOINT mode.
|
|
|
1184 |
*
|
|
|
1185 |
*/
|
|
|
1186 |
|
|
|
1187 |
if ( mode == BPOINT1 ) { /* first integer is change in x */
|
|
|
1188 |
deltax = get_int(0);
|
|
|
1189 |
x = hpos - deltax;
|
|
|
1190 |
} /* End if */
|
|
|
1191 |
|
|
|
1192 |
while ( (c = get_char()) != EOF && (c & MSB) ) {
|
|
|
1193 |
if ( mode == BPOINT1 ) { /* only read y coordinate */
|
|
|
1194 |
y = get_int(c);
|
|
|
1195 |
x += deltax;
|
|
|
1196 |
} else { /* get new x and y from input file */
|
|
|
1197 |
x = get_int(c);
|
|
|
1198 |
y = get_int(0);
|
|
|
1199 |
} /* End else */
|
|
|
1200 |
|
|
|
1201 |
hgoto(x); /* adjust BGI position */
|
|
|
1202 |
vgoto(y);
|
|
|
1203 |
|
|
|
1204 |
fprintf(fp_out, "%d %d\n", hpos, vpos);
|
|
|
1205 |
} /* End while */
|
|
|
1206 |
|
|
|
1207 |
putc('(', fp_out);
|
|
|
1208 |
|
|
|
1209 |
switch ( ch ) {
|
|
|
1210 |
case '(':
|
|
|
1211 |
case ')':
|
|
|
1212 |
case '\\':
|
|
|
1213 |
putc('\\', fp_out);
|
|
|
1214 |
|
|
|
1215 |
default:
|
|
|
1216 |
putc(ch, fp_out);
|
|
|
1217 |
} /* End switch */
|
|
|
1218 |
|
|
|
1219 |
fprintf(fp_out, ")pp\n");
|
|
|
1220 |
|
|
|
1221 |
ungetc(c, fp_in); /* it wasn't part of the point plot */
|
|
|
1222 |
position--;
|
|
|
1223 |
|
|
|
1224 |
} /* End of point_plot */
|
|
|
1225 |
|
|
|
1226 |
/*****************************************************************************/
|
|
|
1227 |
|
|
|
1228 |
line_plot()
|
|
|
1229 |
|
|
|
1230 |
{
|
|
|
1231 |
|
|
|
1232 |
int c; /* next input character from fp_in */
|
|
|
1233 |
int deltax; /* change in x coordinate */
|
|
|
1234 |
int x0, y0; /* starting point for next segment */
|
|
|
1235 |
int x1, y1; /* endpoint of the line */
|
|
|
1236 |
int count = 0; /* number of points so far */
|
|
|
1237 |
|
|
|
1238 |
/*
|
|
|
1239 |
*
|
|
|
1240 |
* Essentially the same format as BPOINT1, except that in this case we connect
|
|
|
1241 |
* pairs of points by line segments.
|
|
|
1242 |
*
|
|
|
1243 |
*/
|
|
|
1244 |
|
|
|
1245 |
deltax = get_int(0); /* again the change in x is first */
|
|
|
1246 |
|
|
|
1247 |
x1 = hpos; /* so it works first time through */
|
|
|
1248 |
y1 = get_int(0);
|
|
|
1249 |
|
|
|
1250 |
while ( (c = get_char()) != EOF && (c & MSB) ) {
|
|
|
1251 |
x0 = x1; /* line starts here */
|
|
|
1252 |
y0 = y1;
|
|
|
1253 |
|
|
|
1254 |
x1 += deltax; /* and ends at this point */
|
|
|
1255 |
y1 = get_int(c);
|
|
|
1256 |
|
|
|
1257 |
fprintf(fp_out, "%d %d\n", -deltax, y0 - y1);
|
|
|
1258 |
count++;
|
|
|
1259 |
} /* End while */
|
|
|
1260 |
|
|
|
1261 |
hgoto(x1); /* adjust current BGI position */
|
|
|
1262 |
vgoto(y1);
|
|
|
1263 |
|
|
|
1264 |
if ( count > 0 )
|
|
|
1265 |
fprintf(fp_out, "%d %d v\n", hpos, vpos);
|
|
|
1266 |
|
|
|
1267 |
ungetc(c, fp_in); /* wasn't part of the line */
|
|
|
1268 |
position--;
|
|
|
1269 |
|
|
|
1270 |
} /* End of line_plot */
|
|
|
1271 |
|
|
|
1272 |
/*****************************************************************************/
|
|
|
1273 |
|
|
|
1274 |
arc(mode)
|
|
|
1275 |
|
|
|
1276 |
int mode; /* FILL or OUTLINE the path */
|
|
|
1277 |
|
|
|
1278 |
{
|
|
|
1279 |
|
|
|
1280 |
int dx1, dy1; /* displacements for first point */
|
|
|
1281 |
int dx2, dy2; /* same for the second point */
|
|
|
1282 |
int radius; /* of the arc */
|
|
|
1283 |
int angle1, angle2; /* starting and ending angles */
|
|
|
1284 |
|
|
|
1285 |
/*
|
|
|
1286 |
*
|
|
|
1287 |
* Called whenever we need to draw an arc. I'm ignoring filled slices for now.
|
|
|
1288 |
*
|
|
|
1289 |
*/
|
|
|
1290 |
|
|
|
1291 |
dx1 = get_int(0); /* displacements relative to center */
|
|
|
1292 |
dy1 = get_int(0);
|
|
|
1293 |
dx2 = get_int(0);
|
|
|
1294 |
dy2 = get_int(0);
|
|
|
1295 |
|
|
|
1296 |
radius = get_int(0); /* and the radius */
|
|
|
1297 |
|
|
|
1298 |
if ( radius == 0 ) /* nothing to do */
|
|
|
1299 |
return;
|
|
|
1300 |
|
|
|
1301 |
angle1 = (atan2((double) dy1, (double) dx1) * 360) / (2 * PI) + .5;
|
|
|
1302 |
angle2 = (atan2((double) dy2, (double) dx2) * 360) / (2 * PI) + .5;
|
|
|
1303 |
|
|
|
1304 |
fprintf(fp_out, "%d %d %d %d %d arcn stroke\n", hpos, vpos, radius, angle1, angle2);
|
|
|
1305 |
|
|
|
1306 |
} /* End of arc */
|
|
|
1307 |
|
|
|
1308 |
/*****************************************************************************/
|
|
|
1309 |
|
|
|
1310 |
pattern()
|
|
|
1311 |
|
|
|
1312 |
{
|
|
|
1313 |
|
|
|
1314 |
double red = 0; /* color components */
|
|
|
1315 |
double green = 0;
|
|
|
1316 |
double blue = 0;
|
|
|
1317 |
int kind; /* corse or fine pattern */
|
|
|
1318 |
int val; /* next color data byte */
|
|
|
1319 |
int i; /* loop index */
|
|
|
1320 |
|
|
|
1321 |
/*
|
|
|
1322 |
*
|
|
|
1323 |
* Handles patterns by setting the current color based of the values assigned to
|
|
|
1324 |
* the next four data bytes. BGI supports two kinds of patterns (fine or coarse)
|
|
|
1325 |
* but I'm handling each in the same way - for now. In a fine pattern the four
|
|
|
1326 |
* data bytes assign a color to four individual pixels (upperleft first) while
|
|
|
1327 |
* in a coarse pattern the four colors are assigned to groups of four pixels,
|
|
|
1328 |
* for a total of 16. Again the first color goes to the group in the upper left
|
|
|
1329 |
* corner. The byte immediately following the BPAT opcode selects fine (040) or
|
|
|
1330 |
* coarse (041) patterns. The PostScript RGB color is assigned by averaging the
|
|
|
1331 |
* RED, GREEN, and BLUE components assigned to the four pixels (or groups of
|
|
|
1332 |
* pixels). Acceptable results, but there's no distinction between fine and
|
|
|
1333 |
* coarse patterns.
|
|
|
1334 |
*
|
|
|
1335 |
*/
|
|
|
1336 |
|
|
|
1337 |
if ( (kind = get_char()) == EOF )
|
|
|
1338 |
error(FATAL, "bad pattern command");
|
|
|
1339 |
|
|
|
1340 |
for ( i = 0; i < 4; i++ ) {
|
|
|
1341 |
val = get_data();
|
|
|
1342 |
red += get_color(val, RED);
|
|
|
1343 |
green += get_color(val, GREEN);
|
|
|
1344 |
blue += get_color(val, BLUE);
|
|
|
1345 |
} /* End for */
|
|
|
1346 |
|
|
|
1347 |
fprintf(fp_out, "%g %g %g c\n", red/4, green/4, blue/4);
|
|
|
1348 |
|
|
|
1349 |
} /* End of pattern */
|
|
|
1350 |
|
|
|
1351 |
/*****************************************************************************/
|
|
|
1352 |
|
|
|
1353 |
get_color(val, component)
|
|
|
1354 |
|
|
|
1355 |
int val; /* color data byte */
|
|
|
1356 |
int component; /* RED, GREEN, or BLUE component */
|
|
|
1357 |
|
|
|
1358 |
{
|
|
|
1359 |
|
|
|
1360 |
|
|
|
1361 |
int primary; /* color mixing mode - bits 2 to 4 */
|
|
|
1362 |
int plane; /* primary color plane - bits 5 to 7 */
|
|
|
1363 |
unsigned rgbcolor; /* PostScript expects an RGB triple */
|
|
|
1364 |
|
|
|
1365 |
/*
|
|
|
1366 |
*
|
|
|
1367 |
* Picks the requested color component (RED, GREEN, or BLUE) from val and returns
|
|
|
1368 |
* the result to the caller. BGI works with Cyan, Yellow, and Magenta so the one's
|
|
|
1369 |
* complement stuff (following the exclusive or'ing) recovers the RED, BLUE, and
|
|
|
1370 |
* GREEN components that PostScript's setrgbcolor operator needs. The PostScript
|
|
|
1371 |
* interpreter in the ColorScript 100 has a setcmycolor operator, but it's not
|
|
|
1372 |
* generally available so I've decided to stick with setrgbcolor.
|
|
|
1373 |
*
|
|
|
1374 |
*/
|
|
|
1375 |
|
|
|
1376 |
primary = (val >> 3) & 07;
|
|
|
1377 |
plane = val & 07;
|
|
|
1378 |
rgbcolor = (~(primary ^ plane)) & 07;
|
|
|
1379 |
|
|
|
1380 |
if ( debug == ON )
|
|
|
1381 |
fprintf(stderr, "val = %o, primary = %o, plane = %o, rgbcolor = %o\n",
|
|
|
1382 |
val, primary, plane, rgbcolor);
|
|
|
1383 |
|
|
|
1384 |
switch ( component ) {
|
|
|
1385 |
case RED:
|
|
|
1386 |
return(rgbcolor>>2);
|
|
|
1387 |
|
|
|
1388 |
case GREEN:
|
|
|
1389 |
return(rgbcolor&01);
|
|
|
1390 |
|
|
|
1391 |
case BLUE:
|
|
|
1392 |
return((rgbcolor>>1)&01);
|
|
|
1393 |
|
|
|
1394 |
default:
|
|
|
1395 |
error(FATAL, "unknown color component");
|
|
|
1396 |
return(0);
|
|
|
1397 |
} /* End switch */
|
|
|
1398 |
|
|
|
1399 |
} /* End of get_color */
|
|
|
1400 |
|
|
|
1401 |
/*****************************************************************************/
|
|
|
1402 |
|
|
|
1403 |
set_color(val)
|
|
|
1404 |
|
|
|
1405 |
int val; /* color data byte */
|
|
|
1406 |
|
|
|
1407 |
{
|
|
|
1408 |
|
|
|
1409 |
/*
|
|
|
1410 |
*
|
|
|
1411 |
* Arranges to have the color set to the value requested in the BGI data byte val.
|
|
|
1412 |
*
|
|
|
1413 |
*/
|
|
|
1414 |
|
|
|
1415 |
fprintf(fp_out, "%d %d %d c\n", get_color(val, RED), get_color(val, GREEN), get_color(val, BLUE));
|
|
|
1416 |
|
|
|
1417 |
} /* End of set_color */
|
|
|
1418 |
|
|
|
1419 |
/*****************************************************************************/
|
|
|
1420 |
|
|
|
1421 |
get_int(highbyte)
|
|
|
1422 |
|
|
|
1423 |
int highbyte; /* already read this byte */
|
|
|
1424 |
|
|
|
1425 |
{
|
|
|
1426 |
|
|
|
1427 |
int lowbyte; /* this and highbyte make the int */
|
|
|
1428 |
|
|
|
1429 |
/*
|
|
|
1430 |
*
|
|
|
1431 |
* Figures out the value on the integer (sign magnitude form) that's next in the
|
|
|
1432 |
* input file. If highbyte is nonzero we'll use it and the next byte to build the
|
|
|
1433 |
* integer, otherwise two bytes are read from fp_in.
|
|
|
1434 |
*
|
|
|
1435 |
*/
|
|
|
1436 |
|
|
|
1437 |
|
|
|
1438 |
if ( highbyte == 0 ) /* need to read the first byte */
|
|
|
1439 |
highbyte = get_data();
|
|
|
1440 |
|
|
|
1441 |
lowbyte = get_data(); /* always need the second byte */
|
|
|
1442 |
|
|
|
1443 |
return(highbyte & SGNB ? -MAG(highbyte, lowbyte) : MAG(highbyte, lowbyte));
|
|
|
1444 |
|
|
|
1445 |
} /* End of get_int */
|
|
|
1446 |
|
|
|
1447 |
/*****************************************************************************/
|
|
|
1448 |
|
|
|
1449 |
get_data()
|
|
|
1450 |
|
|
|
1451 |
{
|
|
|
1452 |
|
|
|
1453 |
int val; /* data value returned to caller */
|
|
|
1454 |
|
|
|
1455 |
/*
|
|
|
1456 |
*
|
|
|
1457 |
* Called when we expect to find a single data character in the input file. The
|
|
|
1458 |
* data bit is turned off and the resulting value is returned to the caller.
|
|
|
1459 |
*
|
|
|
1460 |
*/
|
|
|
1461 |
|
|
|
1462 |
if ( (val = get_char()) == EOF || ! (val & MSB) )
|
|
|
1463 |
error(FATAL, "missing data value");
|
|
|
1464 |
|
|
|
1465 |
return(val & DMASK);
|
|
|
1466 |
|
|
|
1467 |
} /* End of get_data */
|
|
|
1468 |
|
|
|
1469 |
/*****************************************************************************/
|
|
|
1470 |
|
|
|
1471 |
get_char()
|
|
|
1472 |
|
|
|
1473 |
{
|
|
|
1474 |
|
|
|
1475 |
int ch; /* character we just read */
|
|
|
1476 |
|
|
|
1477 |
/*
|
|
|
1478 |
*
|
|
|
1479 |
* Reads the next character from file *fp_in and returns the value to the caller.
|
|
|
1480 |
* This routine isn't really needed, but we may want to deal directly with some
|
|
|
1481 |
* screwball file formats so I thought it would probably be a good idea to isolate
|
|
|
1482 |
* all the input in one routine that could be easily changed.
|
|
|
1483 |
*
|
|
|
1484 |
*/
|
|
|
1485 |
|
|
|
1486 |
if ( (ch = getc(fp_in)) != EOF ) {
|
|
|
1487 |
position++;
|
|
|
1488 |
ch &= CHMASK;
|
|
|
1489 |
} /* End if */
|
|
|
1490 |
|
|
|
1491 |
if ( debug == ON )
|
|
|
1492 |
fprintf(stderr, "%o ", ch);
|
|
|
1493 |
|
|
|
1494 |
return(ch);
|
|
|
1495 |
|
|
|
1496 |
} /* End of get_char */
|
|
|
1497 |
|
|
|
1498 |
/*****************************************************************************/
|
|
|
1499 |
|
|
|
1500 |
redirect(pg)
|
|
|
1501 |
|
|
|
1502 |
int pg; /* next page we're printing */
|
|
|
1503 |
|
|
|
1504 |
{
|
|
|
1505 |
|
|
|
1506 |
static FILE *fp_null = NULL; /* if output is turned off */
|
|
|
1507 |
|
|
|
1508 |
/*
|
|
|
1509 |
*
|
|
|
1510 |
* If we're not supposed to print page pg, fp_out will be directed to /dev/null,
|
|
|
1511 |
* otherwise output goes to stdout.
|
|
|
1512 |
*
|
|
|
1513 |
*/
|
|
|
1514 |
|
|
|
1515 |
if ( pg >= 0 && in_olist(pg) == ON )
|
|
|
1516 |
fp_out = stdout;
|
|
|
1517 |
else if ( (fp_out = fp_null) == NULL )
|
|
|
1518 |
fp_out = fp_null = fopen("/dev/null", "w");
|
|
|
1519 |
|
|
|
1520 |
} /* End of redirect */
|
|
|
1521 |
|
|
|
1522 |
/*****************************************************************************/
|
|
|
1523 |
|