1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1980, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #ifndef lint
33 static const char copyright[] =
34 "@(#) Copyright (c) 1980, 1993\n\
35 The Regents of the University of California. All rights reserved.\n";
36 #endif /* not lint */
37
38 #ifndef lint
39 #if 0
40 static char sccsid[] = "@(#)ul.c 8.1 (Berkeley) 6/6/93";
41 #endif
42 static const char rcsid[] =
43 "$FreeBSD$";
44 #endif /* not lint */
45
46 #include <err.h>
47 #include <locale.h>
48 #include <stdio.h>
49 #include <stdlib.h>
50 #include <string.h>
51 #include <termcap.h>
52 #include <unistd.h>
53 #include <wchar.h>
54 #include <wctype.h>
55
56 #define IESC '\033'
57 #define SO '\016'
58 #define SI '\017'
59 #define HFWD '9'
60 #define HREV '8'
61 #define FREV '7'
62 #define MAXBUF 512
63
64 #define NORMAL 000
65 #define ALTSET 001 /* Reverse */
66 #define SUPERSC 002 /* Dim */
67 #define SUBSC 004 /* Dim | Ul */
68 #define UNDERL 010 /* Ul */
69 #define BOLD 020 /* Bold */
70
71 static int must_use_uc, must_overstrike;
72 static const char
73 *CURS_UP, *CURS_RIGHT, *CURS_LEFT,
74 *ENTER_STANDOUT, *EXIT_STANDOUT, *ENTER_UNDERLINE, *EXIT_UNDERLINE,
75 *ENTER_DIM, *ENTER_BOLD, *ENTER_REVERSE, *UNDER_CHAR, *EXIT_ATTRIBUTES;
76
77 struct CHAR {
78 char c_mode;
79 wchar_t c_char;
80 int c_width; /* width or -1 if multi-column char. filler */
81 } ;
82
83 static struct CHAR sobuf[MAXBUF]; /* static output buffer */
84 static struct CHAR *obuf = sobuf;
85 static int buflen = MAXBUF;
86 static int col, maxcol;
87 static int mode;
88 static int halfpos;
89 static int upln;
90 static int iflag;
91
92 static void usage(void);
93 static void setnewmode(int);
94 static void initcap(void);
95 static void reverse(void);
96 static int outchar(int);
97 static void fwd(void);
98 static void initbuf(void);
99 static void iattr(void);
100 static void overstrike(void);
101 static void flushln(void);
102 static void filter(FILE *);
103 static void outc(wint_t, int);
104
105 #define PRINT(s) if (s == NULL) /* void */; else tputs(s, 1, outchar)
106
107 int
main(int argc,char ** argv)108 main(int argc, char **argv)
109 {
110 int c;
111 const char *termtype;
112 FILE *f;
113 char termcap[1024];
114
115 setlocale(LC_ALL, "");
116
117 termtype = getenv("TERM");
118 if (termtype == NULL || (argv[0][0] == 'c' && !isatty(1)))
119 termtype = "lpr";
120 while ((c = getopt(argc, argv, "it:T:")) != -1)
121 switch (c) {
122 case 't':
123 case 'T': /* for nroff compatibility */
124 termtype = optarg;
125 break;
126 case 'i':
127 iflag = 1;
128 break;
129 default:
130 usage();
131 }
132
133 switch (tgetent(termcap, termtype)) {
134 case 1:
135 break;
136 default:
137 warnx("trouble reading termcap");
138 /* FALLTHROUGH */
139 case 0:
140 /* No such terminal type - assume dumb */
141 (void)strcpy(termcap, "dumb:os:col#80:cr=^M:sf=^J:am:");
142 break;
143 }
144 initcap();
145 if ((tgetflag("os") && ENTER_BOLD == NULL ) ||
146 (tgetflag("ul") && ENTER_UNDERLINE == NULL && UNDER_CHAR == NULL))
147 must_overstrike = 1;
148 initbuf();
149 if (optind == argc)
150 filter(stdin);
151 else for (; optind<argc; optind++) {
152 f = fopen(argv[optind],"r");
153 if (f == NULL)
154 err(1, "%s", argv[optind]);
155 else
156 filter(f);
157 }
158 if (obuf != sobuf) {
159 free(obuf);
160 }
161 exit(0);
162 }
163
164 static void
usage(void)165 usage(void)
166 {
167 fprintf(stderr, "usage: ul [-i] [-t terminal] [file ...]\n");
168 exit(1);
169 }
170
171 static void
filter(FILE * f)172 filter(FILE *f)
173 {
174 wint_t c;
175 int i, w;
176 int copy;
177
178 copy = 0;
179
180 while ((c = getwc(f)) != WEOF) {
181 if (col == buflen) {
182 if (obuf == sobuf) {
183 obuf = NULL;
184 copy = 1;
185 }
186 obuf = realloc(obuf, sizeof(*obuf) * 2 * buflen);
187 if (obuf == NULL) {
188 obuf = sobuf;
189 break;
190 } else if (copy) {
191 memcpy(obuf, sobuf, sizeof(*obuf) * buflen);
192 copy = 0;
193 }
194 bzero((char *)(obuf + buflen), sizeof(*obuf) * buflen);
195 buflen *= 2;
196 }
197 switch(c) {
198 case '\b':
199 if (col > 0)
200 col--;
201 continue;
202
203 case '\t':
204 col = (col+8) & ~07;
205 if (col > maxcol)
206 maxcol = col;
207 continue;
208
209 case '\r':
210 col = 0;
211 continue;
212
213 case SO:
214 mode |= ALTSET;
215 continue;
216
217 case SI:
218 mode &= ~ALTSET;
219 continue;
220
221 case IESC:
222 switch (c = getwc(f)) {
223
224 case HREV:
225 if (halfpos == 0) {
226 mode |= SUPERSC;
227 halfpos--;
228 } else if (halfpos > 0) {
229 mode &= ~SUBSC;
230 halfpos--;
231 } else {
232 halfpos = 0;
233 reverse();
234 }
235 continue;
236
237 case HFWD:
238 if (halfpos == 0) {
239 mode |= SUBSC;
240 halfpos++;
241 } else if (halfpos < 0) {
242 mode &= ~SUPERSC;
243 halfpos++;
244 } else {
245 halfpos = 0;
246 fwd();
247 }
248 continue;
249
250 case FREV:
251 reverse();
252 continue;
253
254 default:
255 errx(1, "unknown escape sequence in input: %o, %o", IESC, c);
256 }
257 continue;
258
259 case '_':
260 if (obuf[col].c_char || obuf[col].c_width < 0) {
261 while (col > 0 && obuf[col].c_width < 0)
262 col--;
263 w = obuf[col].c_width;
264 for (i = 0; i < w; i++)
265 obuf[col++].c_mode |= UNDERL | mode;
266 if (col > maxcol)
267 maxcol = col;
268 continue;
269 }
270 obuf[col].c_char = '_';
271 obuf[col].c_width = 1;
272 /* FALLTHROUGH */
273 case ' ':
274 col++;
275 if (col > maxcol)
276 maxcol = col;
277 continue;
278
279 case '\n':
280 flushln();
281 continue;
282
283 case '\f':
284 flushln();
285 putwchar('\f');
286 continue;
287
288 default:
289 if ((w = wcwidth(c)) <= 0) /* non printing */
290 continue;
291 if (obuf[col].c_char == '\0') {
292 obuf[col].c_char = c;
293 for (i = 0; i < w; i++)
294 obuf[col + i].c_mode = mode;
295 obuf[col].c_width = w;
296 for (i = 1; i < w; i++)
297 obuf[col + i].c_width = -1;
298 } else if (obuf[col].c_char == '_') {
299 obuf[col].c_char = c;
300 for (i = 0; i < w; i++)
301 obuf[col + i].c_mode |= UNDERL|mode;
302 obuf[col].c_width = w;
303 for (i = 1; i < w; i++)
304 obuf[col + i].c_width = -1;
305 } else if ((wint_t)obuf[col].c_char == c) {
306 for (i = 0; i < w; i++)
307 obuf[col + i].c_mode |= BOLD|mode;
308 } else {
309 w = obuf[col].c_width;
310 for (i = 0; i < w; i++)
311 obuf[col + i].c_mode = mode;
312 }
313 col += w;
314 if (col > maxcol)
315 maxcol = col;
316 continue;
317 }
318 }
319 if (ferror(f))
320 err(1, NULL);
321 if (maxcol)
322 flushln();
323 }
324
325 static void
flushln(void)326 flushln(void)
327 {
328 int lastmode;
329 int i;
330 int hadmodes = 0;
331
332 lastmode = NORMAL;
333 for (i = 0; i < maxcol; i++) {
334 if (obuf[i].c_mode != lastmode) {
335 hadmodes++;
336 setnewmode(obuf[i].c_mode);
337 lastmode = obuf[i].c_mode;
338 }
339 if (obuf[i].c_char == '\0') {
340 if (upln)
341 PRINT(CURS_RIGHT);
342 else
343 outc(' ', 1);
344 } else
345 outc(obuf[i].c_char, obuf[i].c_width);
346 if (obuf[i].c_width > 1)
347 i += obuf[i].c_width - 1;
348 }
349 if (lastmode != NORMAL) {
350 setnewmode(0);
351 }
352 if (must_overstrike && hadmodes)
353 overstrike();
354 putwchar('\n');
355 if (iflag && hadmodes)
356 iattr();
357 (void)fflush(stdout);
358 if (upln)
359 upln--;
360 initbuf();
361 }
362
363 /*
364 * For terminals that can overstrike, overstrike underlines and bolds.
365 * We don't do anything with halfline ups and downs, or Greek.
366 */
367 static void
overstrike(void)368 overstrike(void)
369 {
370 int i;
371 wchar_t lbuf[256];
372 wchar_t *cp = lbuf;
373 int hadbold=0;
374
375 /* Set up overstrike buffer */
376 for (i=0; i<maxcol; i++)
377 switch (obuf[i].c_mode) {
378 case NORMAL:
379 default:
380 *cp++ = ' ';
381 break;
382 case UNDERL:
383 *cp++ = '_';
384 break;
385 case BOLD:
386 *cp++ = obuf[i].c_char;
387 if (obuf[i].c_width > 1)
388 i += obuf[i].c_width - 1;
389 hadbold=1;
390 break;
391 }
392 putwchar('\r');
393 for (*cp=' '; *cp==' '; cp--)
394 *cp = 0;
395 for (cp=lbuf; *cp; cp++)
396 putwchar(*cp);
397 if (hadbold) {
398 putwchar('\r');
399 for (cp=lbuf; *cp; cp++)
400 putwchar(*cp=='_' ? ' ' : *cp);
401 putwchar('\r');
402 for (cp=lbuf; *cp; cp++)
403 putwchar(*cp=='_' ? ' ' : *cp);
404 }
405 }
406
407 static void
iattr(void)408 iattr(void)
409 {
410 int i;
411 wchar_t lbuf[256];
412 wchar_t *cp = lbuf;
413
414 for (i=0; i<maxcol; i++)
415 switch (obuf[i].c_mode) {
416 case NORMAL: *cp++ = ' '; break;
417 case ALTSET: *cp++ = 'g'; break;
418 case SUPERSC: *cp++ = '^'; break;
419 case SUBSC: *cp++ = 'v'; break;
420 case UNDERL: *cp++ = '_'; break;
421 case BOLD: *cp++ = '!'; break;
422 default: *cp++ = 'X'; break;
423 }
424 for (*cp=' '; *cp==' '; cp--)
425 *cp = 0;
426 for (cp=lbuf; *cp; cp++)
427 putwchar(*cp);
428 putwchar('\n');
429 }
430
431 static void
initbuf(void)432 initbuf(void)
433 {
434
435 bzero((char *)obuf, buflen * sizeof(*obuf)); /* depends on NORMAL == 0 */
436 col = 0;
437 maxcol = 0;
438 mode &= ALTSET;
439 }
440
441 static void
fwd(void)442 fwd(void)
443 {
444 int oldcol, oldmax;
445
446 oldcol = col;
447 oldmax = maxcol;
448 flushln();
449 col = oldcol;
450 maxcol = oldmax;
451 }
452
453 static void
reverse(void)454 reverse(void)
455 {
456 upln++;
457 fwd();
458 PRINT(CURS_UP);
459 PRINT(CURS_UP);
460 upln++;
461 }
462
463 static void
initcap(void)464 initcap(void)
465 {
466 static char tcapbuf[512];
467 char *bp = tcapbuf;
468
469 /* This nonsense attempts to work with both old and new termcap */
470 CURS_UP = tgetstr("up", &bp);
471 CURS_RIGHT = tgetstr("ri", &bp);
472 if (CURS_RIGHT == NULL)
473 CURS_RIGHT = tgetstr("nd", &bp);
474 CURS_LEFT = tgetstr("le", &bp);
475 if (CURS_LEFT == NULL)
476 CURS_LEFT = tgetstr("bc", &bp);
477 if (CURS_LEFT == NULL && tgetflag("bs"))
478 CURS_LEFT = "\b";
479
480 ENTER_STANDOUT = tgetstr("so", &bp);
481 EXIT_STANDOUT = tgetstr("se", &bp);
482 ENTER_UNDERLINE = tgetstr("us", &bp);
483 EXIT_UNDERLINE = tgetstr("ue", &bp);
484 ENTER_DIM = tgetstr("mh", &bp);
485 ENTER_BOLD = tgetstr("md", &bp);
486 ENTER_REVERSE = tgetstr("mr", &bp);
487 EXIT_ATTRIBUTES = tgetstr("me", &bp);
488
489 if (!ENTER_BOLD && ENTER_REVERSE)
490 ENTER_BOLD = ENTER_REVERSE;
491 if (!ENTER_BOLD && ENTER_STANDOUT)
492 ENTER_BOLD = ENTER_STANDOUT;
493 if (!ENTER_UNDERLINE && ENTER_STANDOUT) {
494 ENTER_UNDERLINE = ENTER_STANDOUT;
495 EXIT_UNDERLINE = EXIT_STANDOUT;
496 }
497 if (!ENTER_DIM && ENTER_STANDOUT)
498 ENTER_DIM = ENTER_STANDOUT;
499 if (!ENTER_REVERSE && ENTER_STANDOUT)
500 ENTER_REVERSE = ENTER_STANDOUT;
501 if (!EXIT_ATTRIBUTES && EXIT_STANDOUT)
502 EXIT_ATTRIBUTES = EXIT_STANDOUT;
503
504 /*
505 * Note that we use REVERSE for the alternate character set,
506 * not the as/ae capabilities. This is because we are modelling
507 * the model 37 teletype (since that's what nroff outputs) and
508 * the typical as/ae is more of a graphics set, not the greek
509 * letters the 37 has.
510 */
511
512 UNDER_CHAR = tgetstr("uc", &bp);
513 must_use_uc = (UNDER_CHAR && !ENTER_UNDERLINE);
514 }
515
516 static int
outchar(int c)517 outchar(int c)
518 {
519 return (putwchar(c) != WEOF ? c : EOF);
520 }
521
522 static int curmode = 0;
523
524 static void
outc(wint_t c,int width)525 outc(wint_t c, int width)
526 {
527 int i;
528
529 putwchar(c);
530 if (must_use_uc && (curmode&UNDERL)) {
531 for (i = 0; i < width; i++)
532 PRINT(CURS_LEFT);
533 for (i = 0; i < width; i++)
534 PRINT(UNDER_CHAR);
535 }
536 }
537
538 static void
setnewmode(int newmode)539 setnewmode(int newmode)
540 {
541 if (!iflag) {
542 if (curmode != NORMAL && newmode != NORMAL)
543 setnewmode(NORMAL);
544 switch (newmode) {
545 case NORMAL:
546 switch(curmode) {
547 case NORMAL:
548 break;
549 case UNDERL:
550 PRINT(EXIT_UNDERLINE);
551 break;
552 default:
553 /* This includes standout */
554 PRINT(EXIT_ATTRIBUTES);
555 break;
556 }
557 break;
558 case ALTSET:
559 PRINT(ENTER_REVERSE);
560 break;
561 case SUPERSC:
562 /*
563 * This only works on a few terminals.
564 * It should be fixed.
565 */
566 PRINT(ENTER_UNDERLINE);
567 PRINT(ENTER_DIM);
568 break;
569 case SUBSC:
570 PRINT(ENTER_DIM);
571 break;
572 case UNDERL:
573 PRINT(ENTER_UNDERLINE);
574 break;
575 case BOLD:
576 PRINT(ENTER_BOLD);
577 break;
578 default:
579 /*
580 * We should have some provision here for multiple modes
581 * on at once. This will have to come later.
582 */
583 PRINT(ENTER_STANDOUT);
584 break;
585 }
586 }
587 curmode = newmode;
588 }
589