usr.bin/ul/ul.c

   1 /*
   2  * Copyright (c) 1980, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1980, 1993 The Regents of the University of California.  All rights reserved.
  30  * @(#)ul.c     8.1 (Berkeley) 6/6/93
  31  * FreeBSD: head/usr.bin/ul/ul.c 245093 2013-01-06 03:08:27Z andrew $
  32  */
  33
  34 #include <err.h>
  35 #include <locale.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39 #include <termcap.h>
  40 #include <unistd.h>
  41 #include <wchar.h>
  42 #include <wctype.h>
  43
  44 #define IESC    '\033'
  45 #define SO      '\016'
  46 #define SI      '\017'
  47 #define HFWD    '9'
  48 #define HREV    '8'
  49 #define FREV    '7'
  50 #define MAXBUF  512
  51
  52 #define NORMAL  000
  53 #define ALTSET  001     /* Reverse */
  54 #define SUPERSC 002     /* Dim */
  55 #define SUBSC   004     /* Dim | Ul */
  56 #define UNDERL  010     /* Ul */
  57 #define BOLD    020     /* Bold */
  58
  59 static int      must_use_uc, must_overstrike;
  60 static const char
  61         *CURS_UP, *CURS_RIGHT, *CURS_LEFT,
  62         *ENTER_STANDOUT, *EXIT_STANDOUT, *ENTER_UNDERLINE, *EXIT_UNDERLINE,
  63         *ENTER_DIM, *ENTER_BOLD, *ENTER_REVERSE, *UNDER_CHAR, *EXIT_ATTRIBUTES;
  64
  65 struct  CHAR    {
  66         char    c_mode;
  67         wchar_t c_char;
  68         int     c_width;        /* width or -1 if multi-column char. filler */
  69 } ;
  70
  71 static struct   CHAR    obuf[MAXBUF];
  72 static int      col, maxcol;
  73 static int      mode;
  74 static int      halfpos;
  75 static int      upln;
  76 static int      iflag;
  77
  78 static void usage(void);
  79 static void setnewmode(int);
  80 static void initcap(void);
  81 static void reverse(void);
  82 static int outchar(int);
  83 static void fwd(void);
  84 static void initbuf(void);
  85 static void iattr(void);
  86 static void overstrike(void);
  87 static void flushln(void);
  88 static void filter(FILE *);
  89 static void outc(wint_t, int);
  90
  91 #define PRINT(s)        if (s == NULL) /* void */; else tputs(s, 1, outchar)
  92
  93 int
  94 main(int argc, char **argv)
  95 {
  96         int c;
  97         const char *termtype;
  98         FILE *f;
  99         char termcap[1024];
 100
 101         setlocale(LC_ALL, "");
 102
 103         termtype = getenv("TERM");
 104         if (termtype == NULL || (argv[0][0] == 'c' && !isatty(1)))
 105                 termtype = "lpr";
 106         while ((c=getopt(argc, argv, "it:T:")) != -1)
 107                 switch(c) {
 108
 109                 case 't':
 110                 case 'T': /* for nroff compatibility */
 111                         termtype = optarg;
 112                         break;
 113                 case 'i':
 114                         iflag = 1;
 115                         break;
 116                 default:
 117                         usage();
 118                 }
 119
 120         switch(tgetent(termcap, termtype)) {
 121
 122         case 1:
 123                 break;
 124
 125         default:
 126                 warnx("trouble reading termcap");
 127                 /* FALLTHROUGH */
 128
 129         case 0:
 130                 /* No such terminal type - assume dumb */
 131                 (void)strcpy(termcap, "dumb:os:col#80:cr=^M:sf=^J:am:");
 132                 break;
 133         }
 134         initcap();
 135         if (    (tgetflag("os") && ENTER_BOLD==NULL ) ||
 136                 (tgetflag("ul") && ENTER_UNDERLINE==NULL && UNDER_CHAR==NULL))
 137                         must_overstrike = 1;
 138         initbuf();
 139         if (optind == argc)
 140                 filter(stdin);
 141         else for (; optind<argc; optind++) {
 142                 f = fopen(argv[optind],"r");
 143                 if (f == NULL)
 144                         err(1, "%s", argv[optind]);
 145                 else
 146                         filter(f);
 147         }
 148         exit(0);
 149 }
 150
 151 static void
 152 usage(void)
 153 {
 154         fprintf(stderr, "usage: ul [-i] [-t terminal] [file ...]\n");
 155         exit(1);
 156 }
 157
 158 static void
 159 filter(FILE *f)
 160 {
 161         wint_t c;
 162         int i, w;
 163
 164         while ((c = getwc(f)) != WEOF && col < MAXBUF) switch(c) {
 165
 166         case '\b':
 167                 if (col > 0)
 168                         col--;
 169                 continue;
 170
 171         case '\t':
 172                 col = (col+8) & ~07;
 173                 if (col > maxcol)
 174                         maxcol = col;
 175                 continue;
 176
 177         case '\r':
 178                 col = 0;
 179                 continue;
 180
 181         case SO:
 182                 mode |= ALTSET;
 183                 continue;
 184
 185         case SI:
 186                 mode &= ~ALTSET;
 187                 continue;
 188
 189         case IESC:
 190                 switch (c = getwc(f)) {
 191
 192                 case HREV:
 193                         if (halfpos == 0) {
 194                                 mode |= SUPERSC;
 195                                 halfpos--;
 196                         } else if (halfpos > 0) {
 197                                 mode &= ~SUBSC;
 198                                 halfpos--;
 199                         } else {
 200                                 halfpos = 0;
 201                                 reverse();
 202                         }
 203                         continue;
 204
 205                 case HFWD:
 206                         if (halfpos == 0) {
 207                                 mode |= SUBSC;
 208                                 halfpos++;
 209                         } else if (halfpos < 0) {
 210                                 mode &= ~SUPERSC;
 211                                 halfpos++;
 212                         } else {
 213                                 halfpos = 0;
 214                                 fwd();
 215                         }
 216                         continue;
 217
 218                 case FREV:
 219                         reverse();
 220                         continue;
 221
 222                 default:
 223                         errx(1, "unknown escape sequence in input: %o, %o", IESC, c);
 224                 }
 225                 continue;
 226
 227         case '_':
 228                 if (obuf[col].c_char || obuf[col].c_width < 0) {
 229                         while (col > 0 && obuf[col].c_width < 0)
 230                                 col--;
 231                         w = obuf[col].c_width;
 232                         for (i = 0; i < w; i++)
 233                                 obuf[col++].c_mode |= UNDERL | mode;
 234                         if (col > maxcol)
 235                                 maxcol = col;
 236                         continue;
 237                 }
 238                 obuf[col].c_char = '_';
 239                 obuf[col].c_width = 1;
 240                 /* FALLTHROUGH */
 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                 putwchar('\f');
 254                 continue;
 255
 256         default:
 257                 if ((w = wcwidth(c)) <= 0)      /* non printing */
 258                         continue;
 259                 if (obuf[col].c_char == '\0') {
 260                         obuf[col].c_char = c;
 261                         for (i = 0; i < w; i++)
 262                                 obuf[col + i].c_mode = mode;
 263                         obuf[col].c_width = w;
 264                         for (i = 1; i < w; i++)
 265                                 obuf[col + i].c_width = -1;
 266                 } else if (obuf[col].c_char == '_') {
 267                         obuf[col].c_char = c;
 268                         for (i = 0; i < w; i++)
 269                                 obuf[col + i].c_mode |= UNDERL|mode;
 270                         obuf[col].c_width = w;
 271                         for (i = 1; i < w; i++)
 272                                 obuf[col + i].c_width = -1;
 273                 } else if ((wint_t)obuf[col].c_char == c) {
 274                         for (i = 0; i < w; i++)
 275                                 obuf[col + i].c_mode |= BOLD|mode;
 276                 } else {
 277                         w = obuf[col].c_width;
 278                         for (i = 0; i < w; i++)
 279                                 obuf[col + i].c_mode = mode;
 280                 }
 281                 col += w;
 282                 if (col > maxcol)
 283                         maxcol = col;
 284                 continue;
 285         }
 286         if (ferror(f))
 287                 err(1, NULL);
 288         if (maxcol)
 289                 flushln();
 290 }
 291
 292 static void
 293 flushln(void)
 294 {
 295         int lastmode;
 296         int i;
 297         int hadmodes = 0;
 298
 299         lastmode = NORMAL;
 300         for (i=0; i<maxcol; i++) {
 301                 if (obuf[i].c_mode != lastmode) {
 302                         hadmodes++;
 303                         setnewmode(obuf[i].c_mode);
 304                         lastmode = obuf[i].c_mode;
 305                 }
 306                 if (obuf[i].c_char == '\0') {
 307                         if (upln)
 308                                 PRINT(CURS_RIGHT);
 309                         else
 310                                 outc(' ', 1);
 311                 } else
 312                         outc(obuf[i].c_char, obuf[i].c_width);
 313                 if (obuf[i].c_width > 1)
 314                         i += obuf[i].c_width - 1;
 315         }
 316         if (lastmode != NORMAL) {
 317                 setnewmode(0);
 318         }
 319         if (must_overstrike && hadmodes)
 320                 overstrike();
 321         putwchar('\n');
 322         if (iflag && hadmodes)
 323                 iattr();
 324         (void)fflush(stdout);
 325         if (upln)
 326                 upln--;
 327         initbuf();
 328 }
 329
 330 /*
 331  * For terminals that can overstrike, overstrike underlines and bolds.
 332  * We don't do anything with halfline ups and downs, or Greek.
 333  */
 334 static void
 335 overstrike(void)
 336 {
 337         int i;
 338         wchar_t lbuf[256];
 339         wchar_t *cp = lbuf;
 340         int hadbold=0;
 341
 342         /* Set up overstrike buffer */
 343         for (i=0; i<maxcol; i++)
 344                 switch (obuf[i].c_mode) {
 345                 case NORMAL:
 346                 default:
 347                         *cp++ = ' ';
 348                         break;
 349                 case UNDERL:
 350                         *cp++ = '_';
 351                         break;
 352                 case BOLD:
 353                         *cp++ = obuf[i].c_char;
 354                         if (obuf[i].c_width > 1)
 355                                 i += obuf[i].c_width - 1;
 356                         hadbold=1;
 357                         break;
 358                 }
 359         putwchar('\r');
 360         for (*cp=' '; *cp==' '; cp--)
 361                 *cp = 0;
 362         for (cp=lbuf; *cp; cp++)
 363                 putwchar(*cp);
 364         if (hadbold) {
 365                 putwchar('\r');
 366                 for (cp=lbuf; *cp; cp++)
 367                         putwchar(*cp=='_' ? ' ' : *cp);
 368                 putwchar('\r');
 369                 for (cp=lbuf; *cp; cp++)
 370                         putwchar(*cp=='_' ? ' ' : *cp);
 371         }
 372 }
 373
 374 static void
 375 iattr(void)
 376 {
 377         int i;
 378         wchar_t lbuf[256];
 379         wchar_t *cp = lbuf;
 380
 381         for (i=0; i<maxcol; i++)
 382                 switch (obuf[i].c_mode) {
 383                 case NORMAL:    *cp++ = ' '; break;
 384                 case ALTSET:    *cp++ = 'g'; break;
 385                 case SUPERSC:   *cp++ = '^'; break;
 386                 case SUBSC:     *cp++ = 'v'; break;
 387                 case UNDERL:    *cp++ = '_'; break;
 388                 case BOLD:      *cp++ = '!'; break;
 389                 default:        *cp++ = 'X'; break;
 390                 }
 391         for (*cp=' '; *cp==' '; cp--)
 392                 *cp = 0;
 393         for (cp=lbuf; *cp; cp++)
 394                 putwchar(*cp);
 395         putwchar('\n');
 396 }
 397
 398 static void
 399 initbuf(void)
 400 {
 401
 402         bzero((char *)obuf, sizeof (obuf));     /* depends on NORMAL == 0 */
 403         col = 0;
 404         maxcol = 0;
 405         mode &= ALTSET;
 406 }
 407
 408 static void
 409 fwd(void)
 410 {
 411         int oldcol, oldmax;
 412
 413         oldcol = col;
 414         oldmax = maxcol;
 415         flushln();
 416         col = oldcol;
 417         maxcol = oldmax;
 418 }
 419
 420 static void
 421 reverse(void)
 422 {
 423         upln++;
 424         fwd();
 425         PRINT(CURS_UP);
 426         PRINT(CURS_UP);
 427         upln++;
 428 }
 429
 430 static void
 431 initcap(void)
 432 {
 433         static char tcapbuf[512];
 434         char *bp = tcapbuf;
 435
 436         /* This nonsense attempts to work with both old and new termcap */
 437         CURS_UP =               tgetstr("up", &bp);
 438         CURS_RIGHT =            tgetstr("ri", &bp);
 439         if (CURS_RIGHT == NULL)
 440                 CURS_RIGHT =    tgetstr("nd", &bp);
 441         CURS_LEFT =             tgetstr("le", &bp);
 442         if (CURS_LEFT == NULL)
 443                 CURS_LEFT =     tgetstr("bc", &bp);
 444         if (CURS_LEFT == NULL && tgetflag("bs"))
 445                 CURS_LEFT =     "\b";
 446
 447         ENTER_STANDOUT =        tgetstr("so", &bp);
 448         EXIT_STANDOUT =         tgetstr("se", &bp);
 449         ENTER_UNDERLINE =       tgetstr("us", &bp);
 450         EXIT_UNDERLINE =        tgetstr("ue", &bp);
 451         ENTER_DIM =             tgetstr("mh", &bp);
 452         ENTER_BOLD =            tgetstr("md", &bp);
 453         ENTER_REVERSE =         tgetstr("mr", &bp);
 454         EXIT_ATTRIBUTES =       tgetstr("me", &bp);
 455
 456         if (!ENTER_BOLD && ENTER_REVERSE)
 457                 ENTER_BOLD = ENTER_REVERSE;
 458         if (!ENTER_BOLD && ENTER_STANDOUT)
 459                 ENTER_BOLD = ENTER_STANDOUT;
 460         if (!ENTER_UNDERLINE && ENTER_STANDOUT) {
 461                 ENTER_UNDERLINE = ENTER_STANDOUT;
 462                 EXIT_UNDERLINE = EXIT_STANDOUT;
 463         }
 464         if (!ENTER_DIM && ENTER_STANDOUT)
 465                 ENTER_DIM = ENTER_STANDOUT;
 466         if (!ENTER_REVERSE && ENTER_STANDOUT)
 467                 ENTER_REVERSE = ENTER_STANDOUT;
 468         if (!EXIT_ATTRIBUTES && EXIT_STANDOUT)
 469                 EXIT_ATTRIBUTES = EXIT_STANDOUT;
 470
 471         /*
 472          * Note that we use REVERSE for the alternate character set,
 473          * not the as/ae capabilities.  This is because we are modelling
 474          * the model 37 teletype (since that's what nroff outputs) and
 475          * the typical as/ae is more of a graphics set, not the greek
 476          * letters the 37 has.
 477          */
 478
 479         UNDER_CHAR =            tgetstr("uc", &bp);
 480         must_use_uc = (UNDER_CHAR && !ENTER_UNDERLINE);
 481 }
 482
 483 static int
 484 outchar(int c)
 485 {
 486         return (putwchar(c) != WEOF ? c : EOF);
 487 }
 488
 489 static int curmode = 0;
 490
 491 static void
 492 outc(wint_t c, int width)
 493 {
 494         int i;
 495
 496         putwchar(c);
 497         if (must_use_uc && (curmode&UNDERL)) {
 498                 for (i = 0; i < width; i++)
 499                         PRINT(CURS_LEFT);
 500                 for (i = 0; i < width; i++)
 501                         PRINT(UNDER_CHAR);
 502         }
 503 }
 504
 505 static void
 506 setnewmode(int newmode)
 507 {
 508         if (!iflag) {
 509                 if (curmode != NORMAL && newmode != NORMAL)
 510                         setnewmode(NORMAL);
 511                 switch (newmode) {
 512                 case NORMAL:
 513                         switch(curmode) {
 514                         case NORMAL:
 515                                 break;
 516                         case UNDERL:
 517                                 PRINT(EXIT_UNDERLINE);
 518                                 break;
 519                         default:
 520                                 /* This includes standout */
 521                                 PRINT(EXIT_ATTRIBUTES);
 522                                 break;
 523                         }
 524                         break;
 525                 case ALTSET:
 526                         PRINT(ENTER_REVERSE);
 527                         break;
 528                 case SUPERSC:
 529                         /*
 530                          * This only works on a few terminals.
 531                          * It should be fixed.
 532                          */
 533                         PRINT(ENTER_UNDERLINE);
 534                         PRINT(ENTER_DIM);
 535                         break;
 536                 case SUBSC:
 537                         PRINT(ENTER_DIM);
 538                         break;
 539                 case UNDERL:
 540                         PRINT(ENTER_UNDERLINE);
 541                         break;
 542                 case BOLD:
 543                         PRINT(ENTER_BOLD);
 544                         break;
 545                 default:
 546                         /*
 547                          * We should have some provision here for multiple modes
 548                          * on at once.  This will have to come later.
 549                          */
 550                         PRINT(ENTER_STANDOUT);
 551                         break;
 552                 }
 553         }
 554         curmode = newmode;
 555 }