ul.c revision 50477 
1178580Simp/*
2178580Simp * Copyright (c) 1980, 1993
3178580Simp *	The Regents of the University of California.  All rights reserved.
4178580Simp *
5178580Simp * Redistribution and use in source and binary forms, with or without
6178580Simp * modification, are permitted provided that the following conditions
7178580Simp * are met:
8178580Simp * 1. Redistributions of source code must retain the above copyright
9178580Simp *    notice, this list of conditions and the following disclaimer.
10178580Simp * 2. Redistributions in binary form must reproduce the above copyright
11178580Simp *    notice, this list of conditions and the following disclaimer in the
12178580Simp *    documentation and/or other materials provided with the distribution.
13178580Simp * 3. All advertising materials mentioning features or use of this software
14178580Simp *    must display the following acknowledgement:
15178580Simp *	This product includes software developed by the University of
16178580Simp *	California, Berkeley and its contributors.
17178580Simp * 4. Neither the name of the University nor the names of its contributors
18178580Simp *    may be used to endorse or promote products derived from this software
19178580Simp *    without specific prior written permission.
20178580Simp *
21178580Simp * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22178580Simp * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23178580Simp * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24178580Simp * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25178580Simp * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26178580Simp * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27178580Simp * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28178580Simp * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29178580Simp * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static const char copyright[] =
36"@(#) Copyright (c) 1980, 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41#if 0
42static char sccsid[] = "@(#)ul.c	8.1 (Berkeley) 6/6/93";
43#endif
44static const char rcsid[] =
45  "$FreeBSD: head/usr.bin/ul/ul.c 50477 1999-08-28 01:08:13Z peter $";
46#endif /* not lint */
47
48#include <err.h>
49#include <stdio.h>
50#include <stdlib.h>
51#include <string.h>
52#include <termcap.h>
53#include <unistd.h>
54
55#define	IESC	'\033'
56#define	SO	'\016'
57#define	SI	'\017'
58#define	HFWD	'9'
59#define	HREV	'8'
60#define	FREV	'7'
61#define	MAXBUF	512
62
63#define	NORMAL	000
64#define	ALTSET	001	/* Reverse */
65#define	SUPERSC	002	/* Dim */
66#define	SUBSC	004	/* Dim | Ul */
67#define	UNDERL	010	/* Ul */
68#define	BOLD	020	/* Bold */
69
70int	must_use_uc, must_overstrike;
71char	*CURS_UP, *CURS_RIGHT, *CURS_LEFT,
72	*ENTER_STANDOUT, *EXIT_STANDOUT, *ENTER_UNDERLINE, *EXIT_UNDERLINE,
73	*ENTER_DIM, *ENTER_BOLD, *ENTER_REVERSE, *UNDER_CHAR, *EXIT_ATTRIBUTES;
74
75struct	CHAR	{
76	char	c_mode;
77	char	c_char;
78} ;
79
80struct	CHAR	obuf[MAXBUF];
81int	col, maxcol;
82int	mode;
83int	halfpos;
84int	upln;
85int	iflag;
86
87static void usage __P((void));
88void setnewmode __P((int));
89void initcap __P((void));
90void reverse __P((void));
91int outchar __P((int));
92void fwd __P((void));
93void initbuf __P((void));
94void iattr __P((void));
95void overstrike __P((void));
96void flushln __P((void));
97void filter __P((FILE *));
98void outc __P((int));
99
100#define	PRINT(s)	if (s == NULL) /* void */; else tputs(s, 1, outchar)
101
102int
103main(argc, argv)
104	int argc;
105	char **argv;
106{
107	int c;
108	char *termtype;
109	FILE *f;
110	char termcap[1024];
111
112	termtype = getenv("TERM");
113	if (termtype == NULL || (argv[0][0] == 'c' && !isatty(1)))
114		termtype = "lpr";
115	while ((c=getopt(argc, argv, "it:T:")) != -1)
116		switch(c) {
117
118		case 't':
119		case 'T': /* for nroff compatibility */
120				termtype = optarg;
121			break;
122		case 'i':
123			iflag = 1;
124			break;
125		default:
126			usage();
127		}
128
129	switch(tgetent(termcap, termtype)) {
130
131	case 1:
132		break;
133
134	default:
135		warnx("trouble reading termcap");
136		/* fall through to ... */
137
138	case 0:
139		/* No such terminal type - assume dumb */
140		(void)strcpy(termcap, "dumb:os:col#80:cr=^M:sf=^J:am:");
141		break;
142	}
143	initcap();
144	if (    (tgetflag("os") && ENTER_BOLD==NULL ) ||
145		(tgetflag("ul") && ENTER_UNDERLINE==NULL && UNDER_CHAR==NULL))
146			must_overstrike = 1;
147	initbuf();
148	if (optind == argc)
149		filter(stdin);
150	else for (; optind<argc; optind++) {
151		f = fopen(argv[optind],"r");
152		if (f == NULL)
153			err(1, "%s", argv[optind]);
154		else
155			filter(f);
156	}
157	exit(0);
158}
159
160static void
161usage()
162{
163	fprintf(stderr, "usage: ul [-i] [-t terminal] file...\n");
164	exit(1);
165}
166
167void
168filter(f)
169	FILE *f;
170{
171	register c;
172
173	while ((c = getc(f)) != EOF) switch(c) {
174
175	case '\b':
176		if (col > 0)
177			col--;
178		continue;
179
180	case '\t':
181		col = (col+8) & ~07;
182		if (col > maxcol)
183			maxcol = col;
184		continue;
185
186	case '\r':
187		col = 0;
188		continue;
189
190	case SO:
191		mode |= ALTSET;
192		continue;
193
194	case SI:
195		mode &= ~ALTSET;
196		continue;
197
198	case IESC:
199		switch (c = getc(f)) {
200
201		case HREV:
202			if (halfpos == 0) {
203				mode |= SUPERSC;
204				halfpos--;
205			} else if (halfpos > 0) {
206				mode &= ~SUBSC;
207				halfpos--;
208			} else {
209				halfpos = 0;
210				reverse();
211			}
212			continue;
213
214		case HFWD:
215			if (halfpos == 0) {
216				mode |= SUBSC;
217				halfpos++;
218			} else if (halfpos < 0) {
219				mode &= ~SUPERSC;
220				halfpos++;
221			} else {
222				halfpos = 0;
223				fwd();
224			}
225			continue;
226
227		case FREV:
228			reverse();
229			continue;
230
231		default:
232			errx(1, "unknown escape sequence in input: %o, %o", IESC, c);
233		}
234		continue;
235
236	case '_':
237		if (obuf[col].c_char)
238			obuf[col].c_mode |= UNDERL | mode;
239		else
240			obuf[col].c_char = '_';
241	case ' ':
242		col++;
243		if (col > maxcol)
244			maxcol = col;
245		continue;
246
247	case '\n':
248		flushln();
249		continue;
250
251	case '\f':
252		flushln();
253		putchar('\f');
254		continue;
255
256	default:
257		if (c < ' ')	/* non printing */
258			continue;
259		if (obuf[col].c_char == '\0') {
260			obuf[col].c_char = c;
261			obuf[col].c_mode = mode;
262		} else if (obuf[col].c_char == '_') {
263			obuf[col].c_char = c;
264			obuf[col].c_mode |= UNDERL|mode;
265		} else if (obuf[col].c_char == c)
266			obuf[col].c_mode |= BOLD|mode;
267		else
268			obuf[col].c_mode = mode;
269		col++;
270		if (col > maxcol)
271			maxcol = col;
272		continue;
273	}
274	if (maxcol)
275		flushln();
276}
277
278void
279flushln()
280{
281	register lastmode;
282	register i;
283	int hadmodes = 0;
284
285	lastmode = NORMAL;
286	for (i=0; i<maxcol; i++) {
287		if (obuf[i].c_mode != lastmode) {
288			hadmodes++;
289			setnewmode(obuf[i].c_mode);
290			lastmode = obuf[i].c_mode;
291		}
292		if (obuf[i].c_char == '\0') {
293			if (upln)
294				PRINT(CURS_RIGHT);
295			else
296				outc(' ');
297		} else
298			outc(obuf[i].c_char);
299	}
300	if (lastmode != NORMAL) {
301		setnewmode(0);
302	}
303	if (must_overstrike && hadmodes)
304		overstrike();
305	putchar('\n');
306	if (iflag && hadmodes)
307		iattr();
308	(void)fflush(stdout);
309	if (upln)
310		upln--;
311	initbuf();
312}
313
314/*
315 * For terminals that can overstrike, overstrike underlines and bolds.
316 * We don't do anything with halfline ups and downs, or Greek.
317 */
318void
319overstrike()
320{
321	register int i;
322	char lbuf[256];
323	register char *cp = lbuf;
324	int hadbold=0;
325
326	/* Set up overstrike buffer */
327	for (i=0; i<maxcol; i++)
328		switch (obuf[i].c_mode) {
329		case NORMAL:
330		default:
331			*cp++ = ' ';
332			break;
333		case UNDERL:
334			*cp++ = '_';
335			break;
336		case BOLD:
337			*cp++ = obuf[i].c_char;
338			hadbold=1;
339			break;
340		}
341	putchar('\r');
342	for (*cp=' '; *cp==' '; cp--)
343		*cp = 0;
344	for (cp=lbuf; *cp; cp++)
345		putchar(*cp);
346	if (hadbold) {
347		putchar('\r');
348		for (cp=lbuf; *cp; cp++)
349			putchar(*cp=='_' ? ' ' : *cp);
350		putchar('\r');
351		for (cp=lbuf; *cp; cp++)
352			putchar(*cp=='_' ? ' ' : *cp);
353	}
354}
355
356void
357iattr()
358{
359	register int i;
360	char lbuf[256];
361	register char *cp = lbuf;
362
363	for (i=0; i<maxcol; i++)
364		switch (obuf[i].c_mode) {
365		case NORMAL:	*cp++ = ' '; break;
366		case ALTSET:	*cp++ = 'g'; break;
367		case SUPERSC:	*cp++ = '^'; break;
368		case SUBSC:	*cp++ = 'v'; break;
369		case UNDERL:	*cp++ = '_'; break;
370		case BOLD:	*cp++ = '!'; break;
371		default:	*cp++ = 'X'; break;
372		}
373	for (*cp=' '; *cp==' '; cp--)
374		*cp = 0;
375	for (cp=lbuf; *cp; cp++)
376		putchar(*cp);
377	putchar('\n');
378}
379
380void
381initbuf()
382{
383
384	bzero((char *)obuf, sizeof (obuf));	/* depends on NORMAL == 0 */
385	col = 0;
386	maxcol = 0;
387	mode &= ALTSET;
388}
389
390void
391fwd()
392{
393	register oldcol, oldmax;
394
395	oldcol = col;
396	oldmax = maxcol;
397	flushln();
398	col = oldcol;
399	maxcol = oldmax;
400}
401
402void
403reverse()
404{
405	upln++;
406	fwd();
407	PRINT(CURS_UP);
408	PRINT(CURS_UP);
409	upln++;
410}
411
412void
413initcap()
414{
415	static char tcapbuf[512];
416	char *bp = tcapbuf;
417
418	/* This nonsense attempts to work with both old and new termcap */
419	CURS_UP =		tgetstr("up", &bp);
420	CURS_RIGHT =		tgetstr("ri", &bp);
421	if (CURS_RIGHT == NULL)
422		CURS_RIGHT =	tgetstr("nd", &bp);
423	CURS_LEFT =		tgetstr("le", &bp);
424	if (CURS_LEFT == NULL)
425		CURS_LEFT =	tgetstr("bc", &bp);
426	if (CURS_LEFT == NULL && tgetflag("bs"))
427		CURS_LEFT =	"\b";
428
429	ENTER_STANDOUT =	tgetstr("so", &bp);
430	EXIT_STANDOUT =		tgetstr("se", &bp);
431	ENTER_UNDERLINE =	tgetstr("us", &bp);
432	EXIT_UNDERLINE =	tgetstr("ue", &bp);
433	ENTER_DIM =		tgetstr("mh", &bp);
434	ENTER_BOLD =		tgetstr("md", &bp);
435	ENTER_REVERSE =		tgetstr("mr", &bp);
436	EXIT_ATTRIBUTES =	tgetstr("me", &bp);
437
438	if (!ENTER_BOLD && ENTER_REVERSE)
439		ENTER_BOLD = ENTER_REVERSE;
440	if (!ENTER_BOLD && ENTER_STANDOUT)
441		ENTER_BOLD = ENTER_STANDOUT;
442	if (!ENTER_UNDERLINE && ENTER_STANDOUT) {
443		ENTER_UNDERLINE = ENTER_STANDOUT;
444		EXIT_UNDERLINE = EXIT_STANDOUT;
445	}
446	if (!ENTER_DIM && ENTER_STANDOUT)
447		ENTER_DIM = ENTER_STANDOUT;
448	if (!ENTER_REVERSE && ENTER_STANDOUT)
449		ENTER_REVERSE = ENTER_STANDOUT;
450	if (!EXIT_ATTRIBUTES && EXIT_STANDOUT)
451		EXIT_ATTRIBUTES = EXIT_STANDOUT;
452
453	/*
454	 * Note that we use REVERSE for the alternate character set,
455	 * not the as/ae capabilities.  This is because we are modelling
456	 * the model 37 teletype (since that's what nroff outputs) and
457	 * the typical as/ae is more of a graphics set, not the greek
458	 * letters the 37 has.
459	 */
460
461	UNDER_CHAR =		tgetstr("uc", &bp);
462	must_use_uc = (UNDER_CHAR && !ENTER_UNDERLINE);
463}
464
465int
466outchar(c)
467	int c;
468{
469	return(putchar(c & 0177));
470}
471
472static int curmode = 0;
473
474void
475outc(c)
476	int c;
477{
478	putchar(c);
479	if (must_use_uc && (curmode&UNDERL)) {
480		PRINT(CURS_LEFT);
481		PRINT(UNDER_CHAR);
482	}
483}
484
485void
486setnewmode(newmode)
487	int newmode;
488{
489	if (!iflag) {
490		if (curmode != NORMAL && newmode != NORMAL)
491			setnewmode(NORMAL);
492		switch (newmode) {
493		case NORMAL:
494			switch(curmode) {
495			case NORMAL:
496				break;
497			case UNDERL:
498				PRINT(EXIT_UNDERLINE);
499				break;
500			default:
501				/* This includes standout */
502				PRINT(EXIT_ATTRIBUTES);
503				break;
504			}
505			break;
506		case ALTSET:
507			PRINT(ENTER_REVERSE);
508			break;
509		case SUPERSC:
510			/*
511			 * This only works on a few terminals.
512			 * It should be fixed.
513			 */
514			PRINT(ENTER_UNDERLINE);
515			PRINT(ENTER_DIM);
516			break;
517		case SUBSC:
518			PRINT(ENTER_DIM);
519			break;
520		case UNDERL:
521			PRINT(ENTER_UNDERLINE);
522			break;
523		case BOLD:
524			PRINT(ENTER_BOLD);
525			break;
526		default:
527			/*
528			 * We should have some provision here for multiple modes
529			 * on at once.  This will have to come later.
530			 */
531			PRINT(ENTER_STANDOUT);
532			break;
533		}
534	}
535	curmode = newmode;
536}
537