contrib/less-4/optfunc.c

   1 /*
   2  * Copyright (C) 1984-2007  Mark Nudelman
   3  *
   4  * You may distribute under the terms of either the GNU General Public
   5  * License or the Less License, as specified in the README file.
   6  *
   7  * For more information about less, or for information on how to
   8  * contact the author, see the README file.
   9  */
  10
  11
  12 /*
  13  * Handling functions for command line options.
  14  *
  15  * Most options are handled by the generic code in option.c.
  16  * But all string options, and a few non-string options, require
  17  * special handling specific to the particular option.
  18  * This special processing is done by the "handling functions" in this file.
  19  *
  20  * Each handling function is passed a "type" and, if it is a string
  21  * option, the string which should be "assigned" to the option.
  22  * The type may be one of:
  23  *      INIT    The option is being initialized from the command line.
  24  *      TOGGLE  The option is being changed from within the program.
  25  *      QUERY   The setting of the option is merely being queried.
  26  */
  27
  28 #include "less.h"
  29 #include "option.h"
  30
  31 extern int nbufs;
  32 extern int bufspace;
  33 extern int pr_type;
  34 extern int plusoption;
  35 extern int swindow;
  36 extern int sc_height;
  37 extern int secure;
  38 extern int dohelp;
  39 extern int any_display;
  40 extern char openquote;
  41 extern char closequote;
  42 extern char *prproto[];
  43 extern char *eqproto;
  44 extern char *hproto;
  45 extern char *wproto;
  46 extern IFILE curr_ifile;
  47 extern char version[];
  48 extern int jump_sline;
  49 extern int jump_sline_fraction;
  50 extern int less_is_more;
  51 #if LOGFILE
  52 extern char *namelogfile;
  53 extern int force_logfile;
  54 extern int logfile;
  55 #endif
  56 #if TAGS
  57 public char *tagoption = NULL;
  58 extern char *tags;
  59 #endif
  60 #if MSDOS_COMPILER
  61 extern int nm_fg_color, nm_bg_color;
  62 extern int bo_fg_color, bo_bg_color;
  63 extern int ul_fg_color, ul_bg_color;
  64 extern int so_fg_color, so_bg_color;
  65 extern int bl_fg_color, bl_bg_color;
  66 #endif
  67
  68
  69 #if LOGFILE
  70 /*
  71  * Handler for -o option.
  72  */
  73         public void
  74 opt_o(type, s)
  75         int type;
  76         char *s;
  77 {
  78         PARG parg;
  79
  80         if (secure)
  81         {
  82                 error("log file support is not available", NULL_PARG);
  83                 return;
  84         }
  85         switch (type)
  86         {
  87         case INIT:
  88                 namelogfile = s;
  89                 break;
  90         case TOGGLE:
  91                 if (ch_getflags() & CH_CANSEEK)
  92                 {
  93                         error("Input is not a pipe", NULL_PARG);
  94                         return;
  95                 }
  96                 if (logfile >= 0)
  97                 {
  98                         error("Log file is already in use", NULL_PARG);
  99                         return;
 100                 }
 101                 s = skipsp(s);
 102                 namelogfile = lglob(s);
 103                 use_logfile(namelogfile);
 104                 sync_logfile();
 105                 break;
 106         case QUERY:
 107                 if (logfile < 0)
 108                         error("No log file", NULL_PARG);
 109                 else
 110                 {
 111                         parg.p_string = namelogfile;
 112                         error("Log file \"%s\"", &parg);
 113                 }
 114                 break;
 115         }
 116 }
 117
 118 /*
 119  * Handler for -O option.
 120  */
 121         public void
 122 opt__O(type, s)
 123         int type;
 124         char *s;
 125 {
 126         force_logfile = TRUE;
 127         opt_o(type, s);
 128 }
 129 #endif
 130
 131 /*
 132  * Handlers for -l option.
 133  */
 134         public void
 135 opt_l(type, s)
 136         int type;
 137         char *s;
 138 {
 139         int err;
 140         int n;
 141         char *t;
 142
 143         switch (type)
 144         {
 145         case INIT:
 146                 t = s;
 147                 n = getnum(&t, "l", &err);
 148                 if (err || n <= 0)
 149                 {
 150                         error("Line number is required after -l", NULL_PARG);
 151                         return;
 152                 }
 153                 plusoption = TRUE;
 154                 ungetsc(s);
 155                 break;
 156         }
 157 }
 158
 159 /*
 160  * Handlers for -j option.
 161  */
 162         public void
 163 opt_j(type, s)
 164         int type;
 165         char *s;
 166 {
 167         PARG parg;
 168         char buf[16];
 169         int len;
 170         int err;
 171
 172         switch (type)
 173         {
 174         case INIT:
 175         case TOGGLE:
 176                 if (*s == '.')
 177                 {
 178                         s++;
 179                         jump_sline_fraction = getfraction(&s, "j", &err);
 180                         if (err)
 181                                 error("Invalid line fraction", NULL_PARG);
 182                         else
 183                                 calc_jump_sline();
 184                 } else
 185                 {
 186                         int sline = getnum(&s, "j", &err);
 187                         if (err)
 188                                 error("Invalid line number", NULL_PARG);
 189                         else
 190                         {
 191                                 jump_sline = sline;
 192                                 jump_sline_fraction = -1;
 193                         }
 194                 }
 195                 break;
 196         case QUERY:
 197                 if (jump_sline_fraction < 0)
 198                 {
 199                         parg.p_int =  jump_sline;
 200                         error("Position target at screen line %d", &parg);
 201                 } else
 202                 {
 203
 204                         sprintf(buf, ".%06d", jump_sline_fraction);
 205                         len = strlen(buf);
 206                         while (len > 2 && buf[len-1] == '0')
 207                                 len--;
 208                         buf[len] = '\0';
 209                         parg.p_string = buf;
 210                         error("Position target at screen position %s", &parg);
 211                 }
 212                 break;
 213         }
 214 }
 215
 216         public void
 217 calc_jump_sline()
 218 {
 219         if (jump_sline_fraction < 0)
 220                 return;
 221         jump_sline = sc_height * jump_sline_fraction / NUM_FRAC_DENOM;
 222 }
 223
 224 #if USERFILE
 225         public void
 226 opt_k(type, s)
 227         int type;
 228         char *s;
 229 {
 230         PARG parg;
 231
 232         switch (type)
 233         {
 234         case INIT:
 235                 if (lesskey(s, 0))
 236                 {
 237                         parg.p_string = s;
 238                         error("Cannot use lesskey file \"%s\"", &parg);
 239                 }
 240                 break;
 241         }
 242 }
 243 #endif
 244
 245 #if TAGS
 246 /*
 247  * Handler for -t option.
 248  */
 249         public void
 250 opt_t(type, s)
 251         int type;
 252         char *s;
 253 {
 254         IFILE save_ifile;
 255         POSITION pos;
 256
 257         switch (type)
 258         {
 259         case INIT:
 260                 tagoption = s;
 261                 /* Do the rest in main() */
 262                 break;
 263         case TOGGLE:
 264                 if (secure)
 265                 {
 266                         error("tags support is not available", NULL_PARG);
 267                         break;
 268                 }
 269                 findtag(skipsp(s));
 270                 save_ifile = save_curr_ifile();
 271                 /*
 272                  * Try to open the file containing the tag
 273                  * and search for the tag in that file.
 274                  */
 275                 if (edit_tagfile() || (pos = tagsearch()) == NULL_POSITION)
 276                 {
 277                         /* Failed: reopen the old file. */
 278                         reedit_ifile(save_ifile);
 279                         break;
 280                 }
 281                 unsave_ifile(save_ifile);
 282                 jump_loc(pos, jump_sline);
 283                 break;
 284         }
 285 }
 286
 287 /*
 288  * Handler for -T option.
 289  */
 290         public void
 291 opt__T(type, s)
 292         int type;
 293         char *s;
 294 {
 295         PARG parg;
 296
 297         switch (type)
 298         {
 299         case INIT:
 300                 tags = s;
 301                 break;
 302         case TOGGLE:
 303                 s = skipsp(s);
 304                 tags = lglob(s);
 305                 break;
 306         case QUERY:
 307                 parg.p_string = tags;
 308                 error("Tags file \"%s\"", &parg);
 309                 break;
 310         }
 311 }
 312 #endif
 313
 314 /*
 315  * Handler for -p option.
 316  */
 317         public void
 318 opt_p(type, s)
 319         int type;
 320         register char *s;
 321 {
 322         switch (type)
 323         {
 324         case INIT:
 325                 /*
 326                  * Unget a search command for the specified string.
 327                  * {{ This won't work if the "/" command is
 328                  *    changed or invalidated by a .lesskey file. }}
 329                  */
 330                 plusoption = TRUE;
 331                 ungetsc(s);
 332                 /*
 333                  * In "more" mode, the -p argument is a command,
 334                  * not a search string, so we don't need a slash.
 335                  */
 336                 if (!less_is_more)
 337                         ungetsc("/");
 338                 break;
 339         }
 340 }
 341
 342 /*
 343  * Handler for -P option.
 344  */
 345         public void
 346 opt__P(type, s)
 347         int type;
 348         register char *s;
 349 {
 350         register char **proto;
 351         PARG parg;
 352
 353         switch (type)
 354         {
 355         case INIT:
 356         case TOGGLE:
 357                 /*
 358                  * Figure out which prototype string should be changed.
 359                  */
 360                 switch (*s)
 361                 {
 362                 case 's':  proto = &prproto[PR_SHORT];  s++;    break;
 363                 case 'm':  proto = &prproto[PR_MEDIUM]; s++;    break;
 364                 case 'M':  proto = &prproto[PR_LONG];   s++;    break;
 365                 case '=':  proto = &eqproto;            s++;    break;
 366                 case 'h':  proto = &hproto;             s++;    break;
 367                 case 'w':  proto = &wproto;             s++;    break;
 368                 default:   proto = &prproto[PR_SHORT];          break;
 369                 }
 370                 free(*proto);
 371                 *proto = save(s);
 372                 break;
 373         case QUERY:
 374                 parg.p_string = prproto[pr_type];
 375                 error("%s", &parg);
 376                 break;
 377         }
 378 }
 379
 380 /*
 381  * Handler for the -b option.
 382  */
 383         /*ARGSUSED*/
 384         public void
 385 opt_b(type, s)
 386         int type;
 387         char *s;
 388 {
 389         switch (type)
 390         {
 391         case INIT:
 392         case TOGGLE:
 393                 /*
 394                  * Set the new number of buffers.
 395                  */
 396                 ch_setbufspace(bufspace);
 397                 break;
 398         case QUERY:
 399                 break;
 400         }
 401 }
 402
 403 /*
 404  * Handler for the -i option.
 405  */
 406         /*ARGSUSED*/
 407         public void
 408 opt_i(type, s)
 409         int type;
 410         char *s;
 411 {
 412         switch (type)
 413         {
 414         case TOGGLE:
 415                 chg_caseless();
 416                 break;
 417         case QUERY:
 418         case INIT:
 419                 break;
 420         }
 421 }
 422
 423 /*
 424  * Handler for the -V option.
 425  */
 426         /*ARGSUSED*/
 427         public void
 428 opt__V(type, s)
 429         int type;
 430         char *s;
 431 {
 432         switch (type)
 433         {
 434         case TOGGLE:
 435         case QUERY:
 436                 dispversion();
 437                 break;
 438         case INIT:
 439                 /*
 440                  * Force output to stdout per GNU standard for --version output.
 441                  */
 442                 any_display = 1;
 443                 putstr("less ");
 444                 putstr(version);
 445                 putstr("\nCopyright (C) 1984-2005 Mark Nudelman\n\n");
 446                 putstr("less comes with NO WARRANTY, to the extent permitted by law.\n");
 447                 putstr("For information about the terms of redistribution,\n");
 448                 putstr("see the file named README in the less distribution.\n");
 449                 putstr("Homepage: http://www.greenwoodsoftware.com/less\n");
 450                 quit(QUIT_OK);
 451                 break;
 452         }
 453 }
 454
 455 #if MSDOS_COMPILER
 456 /*
 457  * Parse an MSDOS color descriptor.
 458  */
 459         static void
 460 colordesc(s, fg_color, bg_color)
 461         char *s;
 462         int *fg_color;
 463         int *bg_color;
 464 {
 465         int fg, bg;
 466         int err;
 467
 468         fg = getnum(&s, "D", &err);
 469         if (err)
 470         {
 471                 error("Missing fg color in -D", NULL_PARG);
 472                 return;
 473         }
 474         if (*s != '.')
 475                 bg = 0;
 476         else
 477         {
 478                 s++;
 479                 bg = getnum(&s, "D", &err);
 480                 if (err)
 481                 {
 482                         error("Missing fg color in -D", NULL_PARG);
 483                         return;
 484                 }
 485         }
 486         if (*s != '\0')
 487                 error("Extra characters at end of -D option", NULL_PARG);
 488         *fg_color = fg;
 489         *bg_color = bg;
 490 }
 491
 492 /*
 493  * Handler for the -D option.
 494  */
 495         /*ARGSUSED*/
 496         public void
 497 opt_D(type, s)
 498         int type;
 499         char *s;
 500 {
 501         switch (type)
 502         {
 503         case INIT:
 504         case TOGGLE:
 505                 switch (*s++)
 506                 {
 507                 case 'n':
 508                         colordesc(s, &nm_fg_color, &nm_bg_color);
 509                         break;
 510                 case 'd':
 511                         colordesc(s, &bo_fg_color, &bo_bg_color);
 512                         break;
 513                 case 'u':
 514                         colordesc(s, &ul_fg_color, &ul_bg_color);
 515                         break;
 516                 case 'k':
 517                         colordesc(s, &bl_fg_color, &bl_bg_color);
 518                         break;
 519                 case 's':
 520                         colordesc(s, &so_fg_color, &so_bg_color);
 521                         break;
 522                 default:
 523                         error("-D must be followed by n, d, u, k or s", NULL_PARG);
 524                         break;
 525                 }
 526                 if (type == TOGGLE)
 527                 {
 528                         at_enter(AT_STANDOUT);
 529                         at_exit();
 530                 }
 531                 break;
 532         case QUERY:
 533                 break;
 534         }
 535 }
 536 #endif
 537
 538 /*
 539  * Handler for the -x option.
 540  */
 541         public void
 542 opt_x(type, s)
 543         int type;
 544         register char *s;
 545 {
 546         extern int tabstops[];
 547         extern int ntabstops;
 548         extern int tabdefault;
 549         char msg[60+(4*TABSTOP_MAX)];
 550         int i;
 551         PARG p;
 552
 553         switch (type)
 554         {
 555         case INIT:
 556         case TOGGLE:
 557                 /* Start at 1 because tabstops[0] is always zero. */
 558                 for (i = 1;  i < TABSTOP_MAX;  )
 559                 {
 560                         int n = 0;
 561                         s = skipsp(s);
 562                         while (*s >= '0' && *s <= '9')
 563                                 n = (10 * n) + (*s++ - '0');
 564                         if (n > tabstops[i-1])
 565                                 tabstops[i++] = n;
 566                         s = skipsp(s);
 567                         if (*s++ != ',')
 568                                 break;
 569                 }
 570                 if (i < 2)
 571                         return;
 572                 ntabstops = i;
 573                 tabdefault = tabstops[ntabstops-1] - tabstops[ntabstops-2];
 574                 break;
 575         case QUERY:
 576                 strcpy(msg, "Tab stops ");
 577                 if (ntabstops > 2)
 578                 {
 579                         for (i = 1;  i < ntabstops;  i++)
 580                         {
 581                                 if (i > 1)
 582                                         strcat(msg, ",");
 583                                 sprintf(msg+strlen(msg), "%d", tabstops[i]);
 584                         }
 585                         sprintf(msg+strlen(msg), " and then ");
 586                 }
 587                 sprintf(msg+strlen(msg), "every %d spaces",
 588                         tabdefault);
 589                 p.p_string = msg;
 590                 error("%s", &p);
 591                 break;
 592         }
 593 }
 594
 595
 596 /*
 597  * Handler for the -" option.
 598  */
 599         public void
 600 opt_quote(type, s)
 601         int type;
 602         register char *s;
 603 {
 604         char buf[3];
 605         PARG parg;
 606
 607         switch (type)
 608         {
 609         case INIT:
 610         case TOGGLE:
 611                 if (s[0] == '\0')
 612                 {
 613                         openquote = closequote = '\0';
 614                         break;
 615                 }
 616                 if (s[1] != '\0' && s[2] != '\0')
 617                 {
 618                         error("-\" must be followed by 1 or 2 chars", NULL_PARG);
 619                         return;
 620                 }
 621                 openquote = s[0];
 622                 if (s[1] == '\0')
 623                         closequote = openquote;
 624                 else
 625                         closequote = s[1];
 626                 break;
 627         case QUERY:
 628                 buf[0] = openquote;
 629                 buf[1] = closequote;
 630                 buf[2] = '\0';
 631                 parg.p_string = buf;
 632                 error("quotes %s", &parg);
 633                 break;
 634         }
 635 }
 636
 637 /*
 638  * "-?" means display a help message.
 639  * If from the command line, exit immediately.
 640  */
 641         /*ARGSUSED*/
 642         public void
 643 opt_query(type, s)
 644         int type;
 645         char *s;
 646 {
 647         switch (type)
 648         {
 649         case QUERY:
 650         case TOGGLE:
 651                 error("Use \"h\" for help", NULL_PARG);
 652                 break;
 653         case INIT:
 654                 dohelp = 1;
 655         }
 656 }
 657
 658 /*
 659  * Get the "screen window" size.
 660  */
 661         public int
 662 get_swindow()
 663 {
 664         if (swindow > 0)
 665                 return (swindow);
 666         return (sc_height + swindow);
 667 }
 668