1 /* 2 * Copyright (C) 1984-2008 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 * The option table. 14 */ 15 16 #include "less.h" 17 #include "option.h" 18 19 /* 20 * Variables controlled by command line options. 21 */ 22 public int quiet; /* Should we suppress the audible bell? */ 23 public int how_search; /* Where should forward searches start? */ 24 public int top_scroll; /* Repaint screen from top? 25 (alternative is scroll from bottom) */ 26 public int pr_type; /* Type of prompt (short, medium, long) */ 27 public int bs_mode; /* How to process backspaces */ 28 public int know_dumb; /* Don't complain about dumb terminals */ 29 public int quit_at_eof; /* Quit after hitting end of file twice */ 30 public int quit_if_one_screen; /* Quit if EOF on first screen */ 31 public int squeeze; /* Squeeze multiple blank lines into one */ 32 public int tabstop; /* Tab settings */ 33 public int back_scroll; /* Repaint screen on backwards movement */ 34 public int forw_scroll; /* Repaint screen on forward movement */ 35 public int caseless; /* Do "caseless" searches */ 36 public int linenums; /* Use line numbers */ 37 public int autobuf; /* Automatically allocate buffers as needed */ 38 public int bufspace; /* Max buffer space per file (K) */ 39 public int ctldisp; /* Send control chars to screen untranslated */ 40 public int force_open; /* Open the file even if not regular file */ 41 public int swindow; /* Size of scrolling window */ 42 public int jump_sline; /* Screen line of "jump target" */ 43 public long jump_sline_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 #if HILITE_SEARCH 56 public int hilite_search; /* Highlight matched search patterns? */ 57 #endif 58 59 public int less_is_more = 0; /* Make compatible with POSIX more */ 60 61 /* 62 * Long option names. 63 */ 64 static struct optname a_optname = { "search-skip-screen", NULL }; 65 static struct optname b_optname = { "buffers", NULL }; 66 static struct optname B__optname = { "auto-buffers", NULL }; 67 static struct optname c_optname = { "clear-screen", NULL }; 68 static struct optname d_optname = { "dumb", NULL }; 69 #if MSDOS_COMPILER 70 static struct optname D__optname = { "color", NULL }; 71 #endif 72 static struct optname e_optname = { "quit-at-eof", NULL }; 73 static struct optname f_optname = { "force", NULL }; 74 static struct optname F__optname = { "quit-if-one-screen", NULL }; 75 #if HILITE_SEARCH 76 static struct optname g_optname = { "hilite-search", NULL }; 77 #endif 78 static struct optname h_optname = { "max-back-scroll", NULL }; 79 static struct optname i_optname = { "ignore-case", NULL }; 80 static struct optname j_optname = { "jump-target", NULL }; 81 static struct optname J__optname = { "status-column", NULL }; 82 #if USERFILE 83 static struct optname k_optname = { "lesskey-file", NULL }; 84 #endif 85 static struct optname K__optname = { "quit-on-intr", NULL }; 86 static struct optname L__optname = { "no-lessopen", NULL }; 87 static struct optname m_optname = { "long-prompt", NULL }; 88 static struct optname n_optname = { "line-numbers", NULL }; 89 #if LOGFILE 90 static struct optname o_optname = { "log-file", NULL }; 91 static struct optname O__optname = { "LOG-FILE", NULL }; 92 #endif 93 static struct optname p_optname = { "pattern", NULL }; 94 static struct optname P__optname = { "prompt", NULL }; 95 static struct optname q2_optname = { "silent", NULL }; 96 static struct optname q_optname = { "quiet", &q2_optname }; 97 static struct optname r_optname = { "raw-control-chars", NULL }; 98 static struct optname s_optname = { "squeeze-blank-lines", NULL }; 99 static struct optname S__optname = { "chop-long-lines", NULL }; 100 #if TAGS 101 static struct optname t_optname = { "tag", NULL }; 102 static struct optname T__optname = { "tag-file", NULL }; 103 #endif 104 static struct optname u_optname = { "underline-special", NULL }; 105 static struct optname V__optname = { "version", NULL }; 106 static struct optname w_optname = { "hilite-unread", NULL }; 107 static struct optname x_optname = { "tabs", NULL }; 108 static struct optname X__optname = { "no-init", NULL }; 109 static struct optname y_optname = { "max-forw-scroll", NULL }; 110 static struct optname z_optname = { "window", NULL }; 111 static struct optname quote_optname = { "quotes", NULL }; 112 static struct optname tilde_optname = { "tilde", NULL }; 113 static struct optname query_optname = { "help", NULL }; 114 static struct optname pound_optname = { "shift", NULL }; 115 static struct optname keypad_optname = { "no-keypad", NULL }; 116 static struct optname oldbot_optname = { "old-bot", NULL }; 117 static struct optname follow_optname = { "follow-name", NULL }; 118 119 120 /* 121 * Table of all options and their semantics. 122 * 123 * For BOOL and TRIPLE options, odesc[0], odesc[1], odesc[2] are 124 * the description of the option when set to 0, 1 or 2, respectively. 125 * For NUMBER options, odesc[0] is the prompt to use when entering 126 * a new value, and odesc[1] is the description, which should contain 127 * one %d which is replaced by the value of the number. 128 * For STRING options, odesc[0] is the prompt to use when entering 129 * a new value, and odesc[1], if not NULL, is the set of characters 130 * that are valid in the string. 131 */ 132 static struct loption option[] = 133 { 134 { 'a', &a_optname, 135 BOOL, OPT_OFF, &how_search, NULL, 136 { 137 "Search includes displayed screen", 138 "Search skips displayed screen", 139 NULL 140 } 141 }, 142 143 { 'b', &b_optname, 144 NUMBER|INIT_HANDLER, 64, &bufspace, opt_b, 145 { 146 "Max buffer space per file (K): ", 147 "Max buffer space per file: %dK", 148 NULL 149 } 150 }, 151 { 'B', &B__optname, 152 BOOL, OPT_ON, &autobuf, NULL, 153 { 154 "Don't automatically allocate buffers", 155 "Automatically allocate buffers when needed", 156 NULL 157 } 158 }, 159 { 'c', &c_optname, 160 TRIPLE, OPT_OFF, &top_scroll, NULL, 161 { 162 "Repaint by scrolling from bottom of screen", 163 "Repaint by painting from top of screen", 164 "Repaint by painting from top of screen" 165 } 166 }, 167 { 'd', &d_optname, 168 BOOL|NO_TOGGLE, OPT_OFF, &know_dumb, NULL, 169 { 170 "Assume intelligent terminal", 171 "Assume dumb terminal", 172 NULL 173 } 174 }, 175 #if MSDOS_COMPILER 176 { 'D', &D__optname, 177 STRING|REPAINT|NO_QUERY, 0, NULL, opt_D, 178 { 179 "color desc: ", 180 "Ddknsu0123456789.", 181 NULL 182 } 183 }, 184 #endif 185 { 'e', &e_optname, 186 TRIPLE, OPT_OFF, &quit_at_eof, NULL, 187 { 188 "Don't quit at end-of-file", 189 "Quit at end-of-file", 190 "Quit immediately at end-of-file" 191 } 192 }, 193 { 'f', &f_optname, 194 BOOL, OPT_OFF, &force_open, NULL, 195 { 196 "Open only regular files", 197 "Open even non-regular files", 198 NULL 199 } 200 }, 201 { 'F', &F__optname, 202 BOOL, OPT_OFF, &quit_if_one_screen, NULL, 203 { 204 "Don't quit if end-of-file on first screen", 205 "Quit if end-of-file on first screen", 206 NULL 207 } 208 }, 209 #if HILITE_SEARCH 210 { 'g', &g_optname, 211 TRIPLE|HL_REPAINT, OPT_ONPLUS, &hilite_search, NULL, 212 { 213 "Don't highlight search matches", 214 "Highlight matches for previous search only", 215 "Highlight all matches for previous search pattern", 216 } 217 }, 218 #endif 219 { 'h', &h_optname, 220 NUMBER, -1, &back_scroll, NULL, 221 { 222 "Backwards scroll limit: ", 223 "Backwards scroll limit is %d lines", 224 NULL 225 } 226 }, 227 { 'i', &i_optname, 228 TRIPLE|HL_REPAINT, OPT_OFF, &caseless, opt_i, 229 { 230 "Case is significant in searches", 231 "Ignore case in searches", 232 "Ignore case in searches and in patterns" 233 } 234 }, 235 { 'j', &j_optname, 236 STRING, 0, NULL, opt_j, 237 { 238 "Target line: ", 239 "0123456789.", 240 NULL 241 } 242 }, 243 { 'J', &J__optname, 244 BOOL|REPAINT, OPT_OFF, &status_col, NULL, 245 { 246 "Don't display a status column", 247 "Display a status column", 248 NULL 249 } 250 }, 251 #if USERFILE 252 { 'k', &k_optname, 253 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_k, 254 { NULL, NULL, NULL } 255 }, 256 #endif 257 { 'K', &K__optname, 258 BOOL, OPT_OFF, &quit_on_intr, NULL, 259 { 260 "Interrupt (ctrl-C) returns to prompt", 261 "Interrupt (ctrl-C) exits less", 262 NULL 263 } 264 }, 265 { 'l', NULL, 266 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_l, 267 { NULL, NULL, NULL } 268 }, 269 { 'L', &L__optname, 270 BOOL, OPT_ON, &use_lessopen, NULL, 271 { 272 "Don't use the LESSOPEN filter", 273 "Use the LESSOPEN filter", 274 NULL 275 } 276 }, 277 { 'm', &m_optname, 278 TRIPLE, OPT_OFF, &pr_type, NULL, 279 { 280 "Short prompt", 281 "Medium prompt", 282 "Long prompt" 283 } 284 }, 285 { 'n', &n_optname, 286 TRIPLE|REPAINT, OPT_ON, &linenums, NULL, 287 { 288 "Don't use line numbers", 289 "Use line numbers", 290 "Constantly display line numbers" 291 } 292 }, 293 #if LOGFILE 294 { 'o', &o_optname, 295 STRING, 0, NULL, opt_o, 296 { "log file: ", NULL, NULL } 297 }, 298 { 'O', &O__optname, 299 STRING, 0, NULL, opt__O, 300 { "Log file: ", NULL, NULL } 301 }, 302 #endif 303 { 'p', &p_optname, 304 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_p, 305 { NULL, NULL, NULL } 306 }, 307 { 'P', &P__optname, 308 STRING, 0, NULL, opt__P, 309 { "prompt: ", NULL, NULL } 310 }, 311 { 'q', &q_optname, 312 TRIPLE, OPT_OFF, &quiet, NULL, 313 { 314 "Ring the bell for errors AND at eof/bof", 315 "Ring the bell for errors but not at eof/bof", 316 "Never ring the bell" 317 } 318 }, 319 { 'r', &r_optname, 320 TRIPLE|REPAINT, OPT_OFF, &ctldisp, NULL, 321 { 322 "Display control characters as ^X", 323 "Display control characters directly", 324 "Display control characters directly, processing ANSI sequences" 325 } 326 }, 327 { 's', &s_optname, 328 BOOL|REPAINT, OPT_OFF, &squeeze, NULL, 329 { 330 "Display all blank lines", 331 "Squeeze multiple blank lines", 332 NULL 333 } 334 }, 335 { 'S', &S__optname, 336 BOOL|REPAINT, OPT_OFF, &chopline, NULL, 337 { 338 "Fold long lines", 339 "Chop long lines", 340 NULL 341 } 342 }, 343 #if TAGS 344 { 't', &t_optname, 345 STRING|NO_QUERY, 0, NULL, opt_t, 346 { "tag: ", NULL, NULL } 347 }, 348 { 'T', &T__optname, 349 STRING, 0, NULL, opt__T, 350 { "tags file: ", NULL, NULL } 351 }, 352 #endif 353 { 'u', &u_optname, 354 TRIPLE|REPAINT, OPT_OFF, &bs_mode, NULL, 355 { 356 "Display underlined text in underline mode", 357 "Backspaces cause overstrike", 358 "Print backspace as ^H" 359 } 360 }, 361 { 'V', &V__optname, 362 NOVAR, 0, NULL, opt__V, 363 { NULL, NULL, NULL } 364 }, 365 { 'w', &w_optname, 366 TRIPLE|REPAINT, OPT_OFF, &show_attn, NULL, 367 { 368 "Don't highlight first unread line", 369 "Highlight first unread line after forward-screen", 370 "Highlight first unread line after any forward movement", 371 } 372 }, 373 { 'x', &x_optname, 374 STRING|REPAINT, 0, NULL, opt_x, 375 { 376 "Tab stops: ", 377 "0123456789,", 378 NULL 379 } 380 }, 381 { 'X', &X__optname, 382 BOOL|NO_TOGGLE, OPT_OFF, &no_init, NULL, 383 { 384 "Send init/deinit strings to terminal", 385 "Don't use init/deinit strings", 386 NULL 387 } 388 }, 389 { 'y', &y_optname, 390 NUMBER, -1, &forw_scroll, NULL, 391 { 392 "Forward scroll limit: ", 393 "Forward scroll limit is %d lines", 394 NULL 395 } 396 }, 397 { 'z', &z_optname, 398 NUMBER, -1, &swindow, NULL, 399 { 400 "Scroll window size: ", 401 "Scroll window size is %d lines", 402 NULL 403 } 404 }, 405 { '"', "e_optname, 406 STRING, 0, NULL, opt_quote, 407 { "quotes: ", NULL, NULL } 408 }, 409 { '~', &tilde_optname, 410 BOOL|REPAINT, OPT_ON, &twiddle, NULL, 411 { 412 "Don't show tildes after end of file", 413 "Show tildes after end of file", 414 NULL 415 } 416 }, 417 { '?', &query_optname, 418 NOVAR, 0, NULL, opt_query, 419 { NULL, NULL, NULL } 420 }, 421 { '#', £_optname, 422 NUMBER, 0, &shift_count, NULL, 423 { 424 "Horizontal shift: ", 425 "Horizontal shift %d positions", 426 NULL 427 } 428 }, 429 { '.', &keypad_optname, 430 BOOL|NO_TOGGLE, OPT_OFF, &no_keypad, NULL, 431 { 432 "Use keypad mode", 433 "Don't use keypad mode", 434 NULL 435 } 436 }, 437 { '.', &oldbot_optname, 438 BOOL, OPT_OFF, &oldbot, NULL, 439 { 440 "Use new bottom of screen behavior", 441 "Use old bottom of screen behavior", 442 NULL 443 } 444 }, 445 { '.', &follow_optname, 446 BOOL, FOLLOW_DESC, &follow_mode, NULL, 447 { 448 "F command Follows file descriptor", 449 "F command Follows file name", 450 NULL 451 } 452 }, 453 { '\0', NULL, NOVAR, 0, NULL, NULL, { NULL, NULL, NULL } } 454 }; 455 456 457 /* 458 * Initialize each option to its default value. 459 */ 460 public void 461 init_option() 462 { 463 register struct loption *o; 464 char *p; 465 466 p = lgetenv("LESS_IS_MORE"); 467 if (p != NULL && *p != '\0') 468 less_is_more = 1; 469 470 for (o = option; o->oletter != '\0'; o++) 471 { 472 /* 473 * Set each variable to its default. 474 */ 475 if (o->ovar != NULL) 476 *(o->ovar) = o->odefault; 477 if (o->otype & INIT_HANDLER) 478 (*(o->ofunc))(INIT, (char *) NULL); 479 } 480 } 481 482 /* 483 * Find an option in the option table, given its option letter. 484 */ 485 public struct loption * 486 findopt(c) 487 int c; 488 { 489 register struct loption *o; 490 491 for (o = option; o->oletter != '\0'; o++) 492 { 493 if (o->oletter == c) 494 return (o); 495 if ((o->otype & TRIPLE) && ASCII_TO_UPPER(o->oletter) == c) 496 return (o); 497 } 498 return (NULL); 499 } 500 501 /* 502 * 503 */ 504 static int 505 is_optchar(c) 506 char c; 507 { 508 if (ASCII_IS_UPPER(c)) 509 return 1; 510 if (ASCII_IS_LOWER(c)) 511 return 1; 512 if (c == '-') 513 return 1; 514 return 0; 515 } 516 517 /* 518 * Find an option in the option table, given its option name. 519 * p_optname is the (possibly partial) name to look for, and 520 * is updated to point after the matched name. 521 * p_oname if non-NULL is set to point to the full option name. 522 */ 523 public struct loption * 524 findopt_name(p_optname, p_oname, p_err) 525 char **p_optname; 526 char **p_oname; 527 int *p_err; 528 { 529 char *optname = *p_optname; 530 register struct loption *o; 531 register struct optname *oname; 532 register int len; 533 int uppercase; 534 struct loption *maxo = NULL; 535 struct optname *maxoname = NULL; 536 int maxlen = 0; 537 int ambig = 0; 538 int exact = 0; 539 540 /* 541 * Check all options. 542 */ 543 for (o = option; o->oletter != '\0'; o++) 544 { 545 /* 546 * Check all names for this option. 547 */ 548 for (oname = o->onames; oname != NULL; oname = oname->onext) 549 { 550 /* 551 * Try normal match first (uppercase == 0), 552 * then, then if it's a TRIPLE option, 553 * try uppercase match (uppercase == 1). 554 */ 555 for (uppercase = 0; uppercase <= 1; uppercase++) 556 { 557 len = sprefix(optname, oname->oname, uppercase); 558 if (len <= 0 || is_optchar(optname[len])) 559 { 560 /* 561 * We didn't use all of the option name. 562 */ 563 continue; 564 } 565 if (!exact && len == maxlen) 566 /* 567 * Already had a partial match, 568 * and now there's another one that 569 * matches the same length. 570 */ 571 ambig = 1; 572 else if (len > maxlen) 573 { 574 /* 575 * Found a better match than 576 * the one we had. 577 */ 578 maxo = o; 579 maxoname = oname; 580 maxlen = len; 581 ambig = 0; 582 exact = (len == (int)strlen(oname->oname)); 583 } 584 if (!(o->otype & TRIPLE)) 585 break; 586 } 587 } 588 } 589 if (ambig) 590 { 591 /* 592 * Name matched more than one option. 593 */ 594 if (p_err != NULL) 595 *p_err = OPT_AMBIG; 596 return (NULL); 597 } 598 *p_optname = optname + maxlen; 599 if (p_oname != NULL) 600 *p_oname = maxoname == NULL ? NULL : maxoname->oname; 601 return (maxo); 602 } 603