1 /* 2 * Copyright (C) 1984-2017 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, see the README file. 8 */ 9 10 11 /* 12 * The option table. 13 */ 14 15 #include "less.h" 16 #include "option.h" 17 18 /* 19 * Variables controlled by command line options. 20 */ 21 public int quiet; /* Should we suppress the audible bell? */ 22 public int how_search; /* Where should forward searches start? */ 23 public int top_scroll; /* Repaint screen from top? 24 (alternative is scroll from bottom) */ 25 public int pr_type; /* Type of prompt (short, medium, long) */ 26 public int bs_mode; /* How to process backspaces */ 27 public int know_dumb; /* Don't complain about dumb terminals */ 28 public int quit_at_eof; /* Quit after hitting end of file twice */ 29 public int quit_if_one_screen; /* Quit if EOF on first screen */ 30 public int squeeze; /* Squeeze multiple blank lines into one */ 31 public int tabstop; /* Tab settings */ 32 public int back_scroll; /* Repaint screen on backwards movement */ 33 public int forw_scroll; /* Repaint screen on forward movement */ 34 public int caseless; /* Do "caseless" searches */ 35 public int linenums; /* Use line numbers */ 36 public int autobuf; /* Automatically allocate buffers as needed */ 37 public int bufspace; /* Max buffer space per file (K) */ 38 public int ctldisp; /* Send control chars to screen untranslated */ 39 public int force_open; /* Open the file even if not regular file */ 40 public int swindow; /* Size of scrolling window */ 41 public int jump_sline; /* Screen line of "jump target" */ 42 public long jump_sline_fraction = -1; 43 public long shift_count_fraction = -1; 44 public int chopline; /* Truncate displayed lines at screen width */ 45 public int no_init; /* Disable sending ti/te termcap strings */ 46 public int no_keypad; /* Disable sending ks/ke termcap strings */ 47 public int twiddle; /* Show tildes after EOF */ 48 public int show_attn; /* Hilite first unread line */ 49 public int shift_count; /* Number of positions to shift horizontally */ 50 public int status_col; /* Display a status column */ 51 public int use_lessopen; /* Use the LESSOPEN filter */ 52 public int quit_on_intr; /* Quit on interrupt */ 53 public int follow_mode; /* F cmd Follows file desc or file name? */ 54 public int oldbot; /* Old bottom of screen behavior {{REMOVE}} */ 55 public int opt_use_backslash; /* Use backslash escaping in option parsing */ 56 public LWCHAR rscroll_char; /* Char which marks chopped lines with -S */ 57 public int rscroll_attr; /* Attribute of rscroll_char */ 58 #if HILITE_SEARCH 59 public int hilite_search; /* Highlight matched search patterns? */ 60 #endif 61 62 public int less_is_more = 0; /* Make compatible with POSIX more */ 63 64 /* 65 * Long option names. 66 */ 67 static struct optname a_optname = { "search-skip-screen", NULL }; 68 static struct optname b_optname = { "buffers", NULL }; 69 static struct optname B__optname = { "auto-buffers", NULL }; 70 static struct optname c_optname = { "clear-screen", NULL }; 71 static struct optname d_optname = { "dumb", NULL }; 72 #if MSDOS_COMPILER 73 static struct optname D__optname = { "color", NULL }; 74 #endif 75 static struct optname e_optname = { "quit-at-eof", NULL }; 76 static struct optname f_optname = { "force", NULL }; 77 static struct optname F__optname = { "quit-if-one-screen", NULL }; 78 #if HILITE_SEARCH 79 static struct optname g_optname = { "hilite-search", NULL }; 80 #endif 81 static struct optname h_optname = { "max-back-scroll", NULL }; 82 static struct optname i_optname = { "ignore-case", NULL }; 83 static struct optname j_optname = { "jump-target", NULL }; 84 static struct optname J__optname = { "status-column", NULL }; 85 #if USERFILE 86 static struct optname k_optname = { "lesskey-file", NULL }; 87 #endif 88 static struct optname K__optname = { "quit-on-intr", NULL }; 89 static struct optname L__optname = { "no-lessopen", NULL }; 90 static struct optname m_optname = { "long-prompt", NULL }; 91 static struct optname n_optname = { "line-numbers", NULL }; 92 #if LOGFILE 93 static struct optname o_optname = { "log-file", NULL }; 94 static struct optname O__optname = { "LOG-FILE", NULL }; 95 #endif 96 static struct optname p_optname = { "pattern", NULL }; 97 static struct optname P__optname = { "prompt", NULL }; 98 static struct optname q2_optname = { "silent", NULL }; 99 static struct optname q_optname = { "quiet", &q2_optname }; 100 static struct optname r_optname = { "raw-control-chars", NULL }; 101 static struct optname s_optname = { "squeeze-blank-lines", NULL }; 102 static struct optname S__optname = { "chop-long-lines", NULL }; 103 #if TAGS 104 static struct optname t_optname = { "tag", NULL }; 105 static struct optname T__optname = { "tag-file", NULL }; 106 #endif 107 static struct optname u_optname = { "underline-special", NULL }; 108 static struct optname V__optname = { "version", NULL }; 109 static struct optname w_optname = { "hilite-unread", NULL }; 110 static struct optname x_optname = { "tabs", NULL }; 111 static struct optname X__optname = { "no-init", NULL }; 112 static struct optname y_optname = { "max-forw-scroll", NULL }; 113 static struct optname z_optname = { "window", NULL }; 114 static struct optname quote_optname = { "quotes", NULL }; 115 static struct optname tilde_optname = { "tilde", NULL }; 116 static struct optname query_optname = { "help", NULL }; 117 static struct optname pound_optname = { "shift", NULL }; 118 static struct optname keypad_optname = { "no-keypad", NULL }; 119 static struct optname oldbot_optname = { "old-bot", NULL }; 120 static struct optname follow_optname = { "follow-name", NULL }; 121 static struct optname use_backslash_optname = { "use-backslash", NULL }; 122 static struct optname rscroll_optname = { "rscroll", NULL }; 123 124 125 /* 126 * Table of all options and their semantics. 127 * 128 * For BOOL and TRIPLE options, odesc[0], odesc[1], odesc[2] are 129 * the description of the option when set to 0, 1 or 2, respectively. 130 * For NUMBER options, odesc[0] is the prompt to use when entering 131 * a new value, and odesc[1] is the description, which should contain 132 * one %d which is replaced by the value of the number. 133 * For STRING options, odesc[0] is the prompt to use when entering 134 * a new value, and odesc[1], if not NULL, is the set of characters 135 * that are valid in the string. 136 */ 137 static struct loption option[] = 138 { 139 { 'a', &a_optname, 140 TRIPLE, OPT_ONPLUS, &how_search, NULL, 141 { 142 "Search includes displayed screen", 143 "Search skips displayed screen", 144 "Search includes all of displayed screen" 145 } 146 }, 147 148 { 'b', &b_optname, 149 NUMBER|INIT_HANDLER, 64, &bufspace, opt_b, 150 { 151 "Max buffer space per file (K): ", 152 "Max buffer space per file: %dK", 153 NULL 154 } 155 }, 156 { 'B', &B__optname, 157 BOOL, OPT_ON, &autobuf, NULL, 158 { 159 "Don't automatically allocate buffers", 160 "Automatically allocate buffers when needed", 161 NULL 162 } 163 }, 164 { 'c', &c_optname, 165 TRIPLE, OPT_OFF, &top_scroll, NULL, 166 { 167 "Repaint by scrolling from bottom of screen", 168 "Repaint by painting from top of screen", 169 "Repaint by painting from top of screen" 170 } 171 }, 172 { 'd', &d_optname, 173 BOOL|NO_TOGGLE, OPT_OFF, &know_dumb, NULL, 174 { 175 "Assume intelligent terminal", 176 "Assume dumb terminal", 177 NULL 178 } 179 }, 180 #if MSDOS_COMPILER 181 { 'D', &D__optname, 182 STRING|REPAINT, 0, NULL, opt_D, 183 { 184 "color desc: ", 185 "Dadknsu0123456789.", 186 NULL 187 } 188 }, 189 #endif 190 { 'e', &e_optname, 191 TRIPLE, OPT_OFF, &quit_at_eof, NULL, 192 { 193 "Don't quit at end-of-file", 194 "Quit at end-of-file", 195 "Quit immediately at end-of-file" 196 } 197 }, 198 { 'f', &f_optname, 199 BOOL, OPT_OFF, &force_open, NULL, 200 { 201 "Open only regular files", 202 "Open even non-regular files", 203 NULL 204 } 205 }, 206 { 'F', &F__optname, 207 BOOL, OPT_OFF, &quit_if_one_screen, NULL, 208 { 209 "Don't quit if end-of-file on first screen", 210 "Quit if end-of-file on first screen", 211 NULL 212 } 213 }, 214 #if HILITE_SEARCH 215 { 'g', &g_optname, 216 TRIPLE|HL_REPAINT, OPT_ONPLUS, &hilite_search, NULL, 217 { 218 "Don't highlight search matches", 219 "Highlight matches for previous search only", 220 "Highlight all matches for previous search pattern", 221 } 222 }, 223 #endif 224 { 'h', &h_optname, 225 NUMBER, -1, &back_scroll, NULL, 226 { 227 "Backwards scroll limit: ", 228 "Backwards scroll limit is %d lines", 229 NULL 230 } 231 }, 232 { 'i', &i_optname, 233 TRIPLE|HL_REPAINT, OPT_OFF, &caseless, opt_i, 234 { 235 "Case is significant in searches", 236 "Ignore case in searches", 237 "Ignore case in searches and in patterns" 238 } 239 }, 240 { 'j', &j_optname, 241 STRING, 0, NULL, opt_j, 242 { 243 "Target line: ", 244 "0123456789.-", 245 NULL 246 } 247 }, 248 { 'J', &J__optname, 249 BOOL|REPAINT, OPT_OFF, &status_col, NULL, 250 { 251 "Don't display a status column", 252 "Display a status column", 253 NULL 254 } 255 }, 256 #if USERFILE 257 { 'k', &k_optname, 258 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_k, 259 { NULL, NULL, NULL } 260 }, 261 #endif 262 { 'K', &K__optname, 263 BOOL, OPT_OFF, &quit_on_intr, NULL, 264 { 265 "Interrupt (ctrl-C) returns to prompt", 266 "Interrupt (ctrl-C) exits less", 267 NULL 268 } 269 }, 270 { 'L', &L__optname, 271 BOOL, OPT_ON, &use_lessopen, NULL, 272 { 273 "Don't use the LESSOPEN filter", 274 "Use the LESSOPEN filter", 275 NULL 276 } 277 }, 278 { 'm', &m_optname, 279 TRIPLE, OPT_OFF, &pr_type, NULL, 280 { 281 "Short prompt", 282 "Medium prompt", 283 "Long prompt" 284 } 285 }, 286 { 'n', &n_optname, 287 TRIPLE|REPAINT, OPT_ON, &linenums, NULL, 288 { 289 "Don't use line numbers", 290 "Use line numbers", 291 "Constantly display line numbers" 292 } 293 }, 294 #if LOGFILE 295 { 'o', &o_optname, 296 STRING, 0, NULL, opt_o, 297 { "log file: ", NULL, NULL } 298 }, 299 { 'O', &O__optname, 300 STRING, 0, NULL, opt__O, 301 { "Log file: ", NULL, NULL } 302 }, 303 #endif 304 { 'p', &p_optname, 305 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_p, 306 { NULL, NULL, NULL } 307 }, 308 { 'P', &P__optname, 309 STRING, 0, NULL, opt__P, 310 { "prompt: ", NULL, NULL } 311 }, 312 { 'q', &q_optname, 313 TRIPLE, OPT_OFF, &quiet, NULL, 314 { 315 "Ring the bell for errors AND at eof/bof", 316 "Ring the bell for errors but not at eof/bof", 317 "Never ring the bell" 318 } 319 }, 320 { 'r', &r_optname, 321 TRIPLE|REPAINT, OPT_OFF, &ctldisp, NULL, 322 { 323 "Display control characters as ^X", 324 "Display control characters directly", 325 "Display control characters directly, processing ANSI sequences" 326 } 327 }, 328 { 's', &s_optname, 329 BOOL|REPAINT, OPT_OFF, &squeeze, NULL, 330 { 331 "Display all blank lines", 332 "Squeeze multiple blank lines", 333 NULL 334 } 335 }, 336 { 'S', &S__optname, 337 BOOL|REPAINT, OPT_OFF, &chopline, NULL, 338 { 339 "Fold long lines", 340 "Chop long lines", 341 NULL 342 } 343 }, 344 #if TAGS 345 { 't', &t_optname, 346 STRING|NO_QUERY, 0, NULL, opt_t, 347 { "tag: ", NULL, NULL } 348 }, 349 { 'T', &T__optname, 350 STRING, 0, NULL, opt__T, 351 { "tags file: ", NULL, NULL } 352 }, 353 #endif 354 { 'u', &u_optname, 355 TRIPLE|REPAINT, OPT_OFF, &bs_mode, NULL, 356 { 357 "Display underlined text in underline mode", 358 "Backspaces cause overstrike", 359 "Print backspace as ^H" 360 } 361 }, 362 { 'V', &V__optname, 363 NOVAR, 0, NULL, opt__V, 364 { NULL, NULL, NULL } 365 }, 366 { 'w', &w_optname, 367 TRIPLE|REPAINT, OPT_OFF, &show_attn, NULL, 368 { 369 "Don't highlight first unread line", 370 "Highlight first unread line after forward-screen", 371 "Highlight first unread line after any forward movement", 372 } 373 }, 374 { 'x', &x_optname, 375 STRING|REPAINT, 0, NULL, opt_x, 376 { 377 "Tab stops: ", 378 "0123456789,", 379 NULL 380 } 381 }, 382 { 'X', &X__optname, 383 BOOL|NO_TOGGLE, OPT_OFF, &no_init, NULL, 384 { 385 "Send init/deinit strings to terminal", 386 "Don't use init/deinit strings", 387 NULL 388 } 389 }, 390 { 'y', &y_optname, 391 NUMBER, -1, &forw_scroll, NULL, 392 { 393 "Forward scroll limit: ", 394 "Forward scroll limit is %d lines", 395 NULL 396 } 397 }, 398 { 'z', &z_optname, 399 NUMBER, -1, &swindow, NULL, 400 { 401 "Scroll window size: ", 402 "Scroll window size is %d lines", 403 NULL 404 } 405 }, 406 { '"', "e_optname, 407 STRING, 0, NULL, opt_quote, 408 { "quotes: ", NULL, NULL } 409 }, 410 { '~', &tilde_optname, 411 BOOL|REPAINT, OPT_ON, &twiddle, NULL, 412 { 413 "Don't show tildes after end of file", 414 "Show tildes after end of file", 415 NULL 416 } 417 }, 418 { '?', &query_optname, 419 NOVAR, 0, NULL, opt_query, 420 { NULL, NULL, NULL } 421 }, 422 { '#', £_optname, 423 STRING, 0, NULL, opt_shift, 424 { 425 "Horizontal shift: ", 426 "0123456789.", 427 NULL 428 } 429 }, 430 { OLETTER_NONE, &keypad_optname, 431 BOOL|NO_TOGGLE, OPT_OFF, &no_keypad, NULL, 432 { 433 "Use keypad mode", 434 "Don't use keypad mode", 435 NULL 436 } 437 }, 438 { OLETTER_NONE, &oldbot_optname, 439 BOOL, OPT_OFF, &oldbot, NULL, 440 { 441 "Use new bottom of screen behavior", 442 "Use old bottom of screen behavior", 443 NULL 444 } 445 }, 446 { OLETTER_NONE, &follow_optname, 447 BOOL, FOLLOW_DESC, &follow_mode, NULL, 448 { 449 "F command follows file descriptor", 450 "F command follows file name", 451 NULL 452 } 453 }, 454 { OLETTER_NONE, &use_backslash_optname, 455 BOOL, OPT_OFF, &opt_use_backslash, NULL, 456 { 457 "Use backslash escaping in command line parameters", 458 "Don't use backslash escaping in command line parameters", 459 NULL 460 } 461 }, 462 { OLETTER_NONE, &rscroll_optname, 463 STRING|REPAINT|INIT_HANDLER, 0, NULL, opt_rscroll, 464 { "right scroll character: ", NULL, NULL } 465 }, 466 { '\0', NULL, NOVAR, 0, NULL, NULL, { NULL, NULL, NULL } } 467 }; 468 469 470 /* 471 * Initialize each option to its default value. 472 */ 473 public void 474 init_option() 475 { 476 struct loption *o; 477 char *p; 478 479 p = lgetenv("LESS_IS_MORE"); 480 if (p != NULL && *p != '\0') 481 less_is_more = 1; 482 483 for (o = option; o->oletter != '\0'; o++) 484 { 485 /* 486 * Set each variable to its default. 487 */ 488 if (o->ovar != NULL) 489 *(o->ovar) = o->odefault; 490 if (o->otype & INIT_HANDLER) 491 (*(o->ofunc))(INIT, (char *) NULL); 492 } 493 } 494 495 /* 496 * Find an option in the option table, given its option letter. 497 */ 498 public struct loption * 499 findopt(c) 500 int c; 501 { 502 struct loption *o; 503 504 for (o = option; o->oletter != '\0'; o++) 505 { 506 if (o->oletter == c) 507 return (o); 508 if ((o->otype & TRIPLE) && ASCII_TO_UPPER(o->oletter) == c) 509 return (o); 510 } 511 return (NULL); 512 } 513 514 /* 515 * 516 */ 517 static int 518 is_optchar(c) 519 char c; 520 { 521 if (ASCII_IS_UPPER(c)) 522 return 1; 523 if (ASCII_IS_LOWER(c)) 524 return 1; 525 if (c == '-') 526 return 1; 527 return 0; 528 } 529 530 /* 531 * Find an option in the option table, given its option name. 532 * p_optname is the (possibly partial) name to look for, and 533 * is updated to point after the matched name. 534 * p_oname if non-NULL is set to point to the full option name. 535 */ 536 public struct loption * 537 findopt_name(p_optname, p_oname, p_err) 538 char **p_optname; 539 char **p_oname; 540 int *p_err; 541 { 542 char *optname = *p_optname; 543 struct loption *o; 544 struct optname *oname; 545 int len; 546 int uppercase; 547 struct loption *maxo = NULL; 548 struct optname *maxoname = NULL; 549 int maxlen = 0; 550 int ambig = 0; 551 int exact = 0; 552 553 /* 554 * Check all options. 555 */ 556 for (o = option; o->oletter != '\0'; o++) 557 { 558 /* 559 * Check all names for this option. 560 */ 561 for (oname = o->onames; oname != NULL; oname = oname->onext) 562 { 563 /* 564 * Try normal match first (uppercase == 0), 565 * then, then if it's a TRIPLE option, 566 * try uppercase match (uppercase == 1). 567 */ 568 for (uppercase = 0; uppercase <= 1; uppercase++) 569 { 570 len = sprefix(optname, oname->oname, uppercase); 571 if (len <= 0 || is_optchar(optname[len])) 572 { 573 /* 574 * We didn't use all of the option name. 575 */ 576 continue; 577 } 578 if (!exact && len == maxlen) 579 /* 580 * Already had a partial match, 581 * and now there's another one that 582 * matches the same length. 583 */ 584 ambig = 1; 585 else if (len > maxlen) 586 { 587 /* 588 * Found a better match than 589 * the one we had. 590 */ 591 maxo = o; 592 maxoname = oname; 593 maxlen = len; 594 ambig = 0; 595 exact = (len == (int)strlen(oname->oname)); 596 } 597 if (!(o->otype & TRIPLE)) 598 break; 599 } 600 } 601 } 602 if (ambig) 603 { 604 /* 605 * Name matched more than one option. 606 */ 607 if (p_err != NULL) 608 *p_err = OPT_AMBIG; 609 return (NULL); 610 } 611 *p_optname = optname + maxlen; 612 if (p_oname != NULL) 613 *p_oname = maxoname == NULL ? NULL : maxoname->oname; 614 return (maxo); 615 } 616