1 /* $NetBSD: opttbl.c,v 1.3 2011/07/03 20:14:13 tron Exp $ */ 2 3 /* 4 * Copyright (C) 1984-2011 Mark Nudelman 5 * 6 * You may distribute under the terms of either the GNU General Public 7 * License or the Less License, as specified in the README file. 8 * 9 * For more information about less, or for information on how to 10 * contact the author, see the README file. 11 */ 12 13 14 /* 15 * The option table. 16 */ 17 18 #include "less.h" 19 #include "option.h" 20 21 /* 22 * Variables controlled by command line options. 23 */ 24 public int quiet; /* Should we suppress the audible bell? */ 25 public int how_search; /* Where should forward searches start? */ 26 public int top_scroll; /* Repaint screen from top? 27 (alternative is scroll from bottom) */ 28 public int pr_type; /* Type of prompt (short, medium, long) */ 29 public int bs_mode; /* How to process backspaces */ 30 public int know_dumb; /* Don't complain about dumb terminals */ 31 public int quit_at_eof; /* Quit after hitting end of file twice */ 32 public int quit_if_one_screen; /* Quit if EOF on first screen */ 33 public int be_helpful; /* more(1) style -d */ 34 public int squeeze; /* Squeeze multiple blank lines into one */ 35 public int tabstop; /* Tab settings */ 36 public int back_scroll; /* Repaint screen on backwards movement */ 37 public int forw_scroll; /* Repaint screen on forward movement */ 38 public int caseless; /* Do "caseless" searches */ 39 public int linenums; /* Use line numbers */ 40 public int autobuf; /* Automatically allocate buffers as needed */ 41 public int bufspace; /* Max buffer space per file (K) */ 42 public int ctldisp; /* Send control chars to screen untranslated */ 43 public int force_open; /* Open the file even if not regular file */ 44 public int swindow; /* Size of scrolling window */ 45 public int jump_sline; /* Screen line of "jump target" */ 46 public long jump_sline_fraction = -1; 47 public long shift_count_fraction = -1; 48 public int chopline; /* Truncate displayed lines at screen width */ 49 public int no_init; /* Disable sending ti/te termcap strings */ 50 public int no_keypad; /* Disable sending ks/ke termcap strings */ 51 public int twiddle; /* Show tildes after EOF */ 52 public int show_attn; /* Hilite first unread line */ 53 public int shift_count; /* Number of positions to shift horizontally */ 54 public int status_col; /* Display a status column */ 55 public int use_lessopen; /* Use the LESSOPEN filter */ 56 public int quit_on_intr; /* Quit on interrupt */ 57 public int follow_mode; /* F cmd Follows file desc or file name? */ 58 public int oldbot; /* Old bottom of screen behavior {{REMOVE}} */ 59 #if HILITE_SEARCH 60 public int hilite_search; /* Highlight matched search patterns? */ 61 #endif 62 63 public int less_is_more = 0; /* Make compatible with POSIX more */ 64 65 /* 66 * Long option names. 67 */ 68 static struct optname a_optname = { "search-skip-screen", NULL }; 69 static struct optname b_optname = { "buffers", NULL }; 70 static struct optname B__optname = { "auto-buffers", NULL }; 71 static struct optname c_optname = { "clear-screen", NULL }; 72 static struct optname d_optname = { "dumb", NULL }; 73 #if MSDOS_COMPILER 74 static struct optname D__optname = { "color", NULL }; 75 #endif 76 static struct optname e_optname = { "quit-at-eof", NULL }; 77 static struct optname f_optname = { "force", NULL }; 78 static struct optname F__optname = { "quit-if-one-screen", NULL }; 79 #if HILITE_SEARCH 80 static struct optname g_optname = { "hilite-search", NULL }; 81 #endif 82 static struct optname h_optname = { "max-back-scroll", NULL }; 83 static struct optname i_optname = { "ignore-case", NULL }; 84 static struct optname j_optname = { "jump-target", NULL }; 85 static struct optname J__optname = { "status-column", NULL }; 86 #if USERFILE 87 static struct optname k_optname = { "lesskey-file", NULL }; 88 #endif 89 static struct optname K__optname = { "quit-on-intr", NULL }; 90 static struct optname L__optname = { "no-lessopen", NULL }; 91 static struct optname m_optname = { "long-prompt", NULL }; 92 static struct optname n_optname = { "line-numbers", NULL }; 93 #if LOGFILE 94 static struct optname o_optname = { "log-file", NULL }; 95 static struct optname O__optname = { "LOG-FILE", NULL }; 96 #endif 97 static struct optname p_optname = { "pattern", NULL }; 98 static struct optname P__optname = { "prompt", NULL }; 99 static struct optname q2_optname = { "silent", NULL }; 100 static struct optname q_optname = { "quiet", &q2_optname }; 101 static struct optname r_optname = { "raw-control-chars", NULL }; 102 static struct optname s_optname = { "squeeze-blank-lines", NULL }; 103 static struct optname S__optname = { "chop-long-lines", NULL }; 104 #if TAGS 105 static struct optname t_optname = { "tag", NULL }; 106 static struct optname T__optname = { "tag-file", NULL }; 107 #endif 108 static struct optname u_optname = { "underline-special", NULL }; 109 static struct optname V__optname = { "version", NULL }; 110 static struct optname w_optname = { "hilite-unread", NULL }; 111 static struct optname x_optname = { "tabs", NULL }; 112 static struct optname X__optname = { "no-init", NULL }; 113 static struct optname y_optname = { "max-forw-scroll", NULL }; 114 static struct optname z_optname = { "window", NULL }; 115 static struct optname quote_optname = { "quotes", NULL }; 116 static struct optname tilde_optname = { "tilde", NULL }; 117 static struct optname query_optname = { "help", NULL }; 118 static struct optname pound_optname = { "shift", NULL }; 119 static struct optname keypad_optname = { "no-keypad", NULL }; 120 static struct optname oldbot_optname = { "old-bot", NULL }; 121 static struct optname follow_optname = { "follow-name", NULL }; 122 123 124 /* 125 * Table of all options and their semantics. 126 * 127 * For BOOL and TRIPLE options, odesc[0], odesc[1], odesc[2] are 128 * the description of the option when set to 0, 1 or 2, respectively. 129 * For NUMBER options, odesc[0] is the prompt to use when entering 130 * a new value, and odesc[1] is the description, which should contain 131 * one %d which is replaced by the value of the number. 132 * For STRING options, odesc[0] is the prompt to use when entering 133 * a new value, and odesc[1], if not NULL, is the set of characters 134 * that are valid in the string. 135 */ 136 static struct loption option[] = 137 { 138 { 'a', &a_optname, 139 TRIPLE, OPT_ONPLUS, &how_search, NULL, 140 { 141 "Search includes displayed screen", 142 "Search skips displayed screen", 143 "Search includes all of displayed screen" 144 } 145 }, 146 147 { 'b', &b_optname, 148 NUMBER|INIT_HANDLER, 64, &bufspace, opt_b, 149 { 150 "Max buffer space per file (K): ", 151 "Max buffer space per file: %dK", 152 NULL 153 } 154 }, 155 { 'B', &B__optname, 156 BOOL, OPT_ON, &autobuf, NULL, 157 { 158 "Don't automatically allocate buffers", 159 "Automatically allocate buffers when needed", 160 NULL 161 } 162 }, 163 { 'c', &c_optname, 164 TRIPLE, OPT_OFF, &top_scroll, NULL, 165 { 166 "Repaint by scrolling from bottom of screen", 167 "Repaint by painting from top of screen", 168 "Repaint by painting from top of screen" 169 } 170 }, 171 #if 1 172 { 'd', &d_optname, 173 BOOL, OPT_OFF, &be_helpful, NULL, 174 { "Be less helpful in prompts", 175 "Be helpful in prompts", 176 NULL } 177 }, 178 #endif 179 { -1, &d_optname, 180 BOOL|NO_TOGGLE, OPT_OFF, &know_dumb, NULL, 181 { 182 "Assume intelligent terminal", 183 "Assume dumb terminal", 184 NULL 185 } 186 }, 187 #if MSDOS_COMPILER 188 { 'D', &D__optname, 189 STRING|REPAINT|NO_QUERY, 0, NULL, opt_D, 190 { 191 "color desc: ", 192 "Ddknsu0123456789.", 193 NULL 194 } 195 }, 196 #endif 197 { 'e', &e_optname, 198 TRIPLE, OPT_OFF, &quit_at_eof, NULL, 199 { 200 "Don't quit at end-of-file", 201 "Quit at end-of-file", 202 "Quit immediately at end-of-file" 203 } 204 }, 205 { 'f', &f_optname, 206 BOOL, OPT_OFF, &force_open, NULL, 207 { 208 "Open only regular files", 209 "Open even non-regular files", 210 NULL 211 } 212 }, 213 { 'F', &F__optname, 214 BOOL, OPT_OFF, &quit_if_one_screen, NULL, 215 { 216 "Don't quit if end-of-file on first screen", 217 "Quit if end-of-file on first screen", 218 NULL 219 } 220 }, 221 #if HILITE_SEARCH 222 { 'g', &g_optname, 223 TRIPLE|HL_REPAINT, OPT_ONPLUS, &hilite_search, NULL, 224 { 225 "Don't highlight search matches", 226 "Highlight matches for previous search only", 227 "Highlight all matches for previous search pattern", 228 } 229 }, 230 #endif 231 { 'h', &h_optname, 232 NUMBER, -1, &back_scroll, NULL, 233 { 234 "Backwards scroll limit: ", 235 "Backwards scroll limit is %d lines", 236 NULL 237 } 238 }, 239 { 'i', &i_optname, 240 TRIPLE|HL_REPAINT, OPT_OFF, &caseless, opt_i, 241 { 242 "Case is significant in searches", 243 "Ignore case in searches", 244 "Ignore case in searches and in patterns" 245 } 246 }, 247 { 'j', &j_optname, 248 STRING, 0, NULL, opt_j, 249 { 250 "Target line: ", 251 "0123456789.-", 252 NULL 253 } 254 }, 255 { 'J', &J__optname, 256 BOOL|REPAINT, OPT_OFF, &status_col, NULL, 257 { 258 "Don't display a status column", 259 "Display a status column", 260 NULL 261 } 262 }, 263 #if USERFILE 264 { 'k', &k_optname, 265 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_k, 266 { NULL, NULL, NULL } 267 }, 268 #endif 269 { 'K', &K__optname, 270 BOOL, OPT_OFF, &quit_on_intr, NULL, 271 { 272 "Interrupt (ctrl-C) returns to prompt", 273 "Interrupt (ctrl-C) exits less", 274 NULL 275 } 276 }, 277 { 'L', &L__optname, 278 BOOL, OPT_ON, &use_lessopen, NULL, 279 { 280 "Don't use the LESSOPEN filter", 281 "Use the LESSOPEN filter", 282 NULL 283 } 284 }, 285 { 'm', &m_optname, 286 TRIPLE, OPT_OFF, &pr_type, NULL, 287 { 288 "Short prompt", 289 "Medium prompt", 290 "Long prompt" 291 } 292 }, 293 { 'n', &n_optname, 294 TRIPLE|REPAINT, OPT_ON, &linenums, NULL, 295 { 296 "Don't use line numbers", 297 "Use line numbers", 298 "Constantly display line numbers" 299 } 300 }, 301 #if LOGFILE 302 { 'o', &o_optname, 303 STRING, 0, NULL, opt_o, 304 { "log file: ", NULL, NULL } 305 }, 306 { 'O', &O__optname, 307 STRING, 0, NULL, opt__O, 308 { "Log file: ", NULL, NULL } 309 }, 310 #endif 311 { 'p', &p_optname, 312 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_p, 313 { NULL, NULL, NULL } 314 }, 315 { 'P', &P__optname, 316 STRING, 0, NULL, opt__P, 317 { "prompt: ", NULL, NULL } 318 }, 319 { 'q', &q_optname, 320 TRIPLE, OPT_OFF, &quiet, NULL, 321 { 322 "Ring the bell for errors AND at eof/bof", 323 "Ring the bell for errors but not at eof/bof", 324 "Never ring the bell" 325 } 326 }, 327 { 'r', &r_optname, 328 TRIPLE|REPAINT, OPT_OFF, &ctldisp, NULL, 329 { 330 "Display control characters as ^X", 331 "Display control characters directly", 332 "Display control characters directly, processing ANSI sequences" 333 } 334 }, 335 { 's', &s_optname, 336 BOOL|REPAINT, OPT_OFF, &squeeze, NULL, 337 { 338 "Display all blank lines", 339 "Squeeze multiple blank lines", 340 NULL 341 } 342 }, 343 { 'S', &S__optname, 344 BOOL|REPAINT, OPT_OFF, &chopline, NULL, 345 { 346 "Fold long lines", 347 "Chop long lines", 348 NULL 349 } 350 }, 351 #if TAGS 352 { 't', &t_optname, 353 STRING|NO_QUERY, 0, NULL, opt_t, 354 { "tag: ", NULL, NULL } 355 }, 356 { 'T', &T__optname, 357 STRING, 0, NULL, opt__T, 358 { "tags file: ", NULL, NULL } 359 }, 360 #endif 361 { 'u', &u_optname, 362 TRIPLE|REPAINT, OPT_OFF, &bs_mode, NULL, 363 { 364 "Display underlined text in underline mode", 365 "Backspaces cause overstrike", 366 "Print backspace as ^H" 367 } 368 }, 369 { 'V', &V__optname, 370 NOVAR, 0, NULL, opt__V, 371 { NULL, NULL, NULL } 372 }, 373 { 'w', &w_optname, 374 TRIPLE|REPAINT, OPT_OFF, &show_attn, NULL, 375 { 376 "Don't highlight first unread line", 377 "Highlight first unread line after forward-screen", 378 "Highlight first unread line after any forward movement", 379 } 380 }, 381 { 'x', &x_optname, 382 STRING|REPAINT, 0, NULL, opt_x, 383 { 384 "Tab stops: ", 385 "0123456789,", 386 NULL 387 } 388 }, 389 { 'X', &X__optname, 390 BOOL|NO_TOGGLE, OPT_OFF, &no_init, NULL, 391 { 392 "Send init/deinit strings to terminal", 393 "Don't use init/deinit strings", 394 NULL 395 } 396 }, 397 { 'y', &y_optname, 398 NUMBER, -1, &forw_scroll, NULL, 399 { 400 "Forward scroll limit: ", 401 "Forward scroll limit is %d lines", 402 NULL 403 } 404 }, 405 { 'z', &z_optname, 406 NUMBER, -1, &swindow, NULL, 407 { 408 "Scroll window size: ", 409 "Scroll window size is %d lines", 410 NULL 411 } 412 }, 413 { '"', "e_optname, 414 STRING, 0, NULL, opt_quote, 415 { "quotes: ", NULL, NULL } 416 }, 417 { '~', &tilde_optname, 418 BOOL|REPAINT, OPT_ON, &twiddle, NULL, 419 { 420 "Don't show tildes after end of file", 421 "Show tildes after end of file", 422 NULL 423 } 424 }, 425 { '?', &query_optname, 426 NOVAR, 0, NULL, opt_query, 427 { NULL, NULL, NULL } 428 }, 429 { '#', £_optname, 430 STRING, 0, NULL, opt_shift, 431 { 432 "Horizontal shift: ", 433 "0123456789.", 434 NULL 435 } 436 }, 437 { OLETTER_NONE, &keypad_optname, 438 BOOL|NO_TOGGLE, OPT_OFF, &no_keypad, NULL, 439 { 440 "Use keypad mode", 441 "Don't use keypad mode", 442 NULL 443 } 444 }, 445 { OLETTER_NONE, &oldbot_optname, 446 BOOL, OPT_OFF, &oldbot, NULL, 447 { 448 "Use new bottom of screen behavior", 449 "Use old bottom of screen behavior", 450 NULL 451 } 452 }, 453 { OLETTER_NONE, &follow_optname, 454 BOOL, FOLLOW_DESC, &follow_mode, NULL, 455 { 456 "F command follows file descriptor", 457 "F command follows file name", 458 NULL 459 } 460 }, 461 { '\0', NULL, NOVAR, 0, NULL, NULL, { NULL, NULL, NULL } } 462 }; 463 464 465 /* 466 * Initialize each option to its default value. 467 */ 468 public void 469 init_option() 470 { 471 register struct loption *o; 472 char *p; 473 474 p = lgetenv("LESS_IS_MORE"); 475 if (p != NULL && *p != '\0') 476 less_is_more = 1; 477 478 for (o = option; o->oletter != '\0'; o++) 479 { 480 /* 481 * Set each variable to its default. 482 */ 483 if (o->ovar != NULL) 484 *(o->ovar) = o->odefault; 485 if (o->otype & INIT_HANDLER) 486 (*(o->ofunc))(INIT, (char *) NULL); 487 } 488 } 489 490 /* 491 * Find an option in the option table, given its option letter. 492 */ 493 public struct loption * 494 findopt(c) 495 int c; 496 { 497 register struct loption *o; 498 499 for (o = option; o->oletter != '\0'; o++) 500 { 501 if (o->oletter == c) 502 return (o); 503 if ((o->otype & TRIPLE) && ASCII_TO_UPPER(o->oletter) == c) 504 return (o); 505 } 506 return (NULL); 507 } 508 509 /* 510 * 511 */ 512 static int 513 is_optchar(c) 514 char c; 515 { 516 if (ASCII_IS_UPPER(c)) 517 return 1; 518 if (ASCII_IS_LOWER(c)) 519 return 1; 520 if (c == '-') 521 return 1; 522 return 0; 523 } 524 525 /* 526 * Find an option in the option table, given its option name. 527 * p_optname is the (possibly partial) name to look for, and 528 * is updated to point after the matched name. 529 * p_oname if non-NULL is set to point to the full option name. 530 */ 531 public struct loption * 532 findopt_name(p_optname, p_oname, p_err) 533 char **p_optname; 534 char **p_oname; 535 int *p_err; 536 { 537 char *optname = *p_optname; 538 register struct loption *o; 539 register struct optname *oname; 540 register int len; 541 int uppercase; 542 struct loption *maxo = NULL; 543 struct optname *maxoname = NULL; 544 int maxlen = 0; 545 int ambig = 0; 546 int exact = 0; 547 548 /* 549 * Check all options. 550 */ 551 for (o = option; o->oletter != '\0'; o++) 552 { 553 /* 554 * Check all names for this option. 555 */ 556 for (oname = o->onames; oname != NULL; oname = oname->onext) 557 { 558 /* 559 * Try normal match first (uppercase == 0), 560 * then, then if it's a TRIPLE option, 561 * try uppercase match (uppercase == 1). 562 */ 563 for (uppercase = 0; uppercase <= 1; uppercase++) 564 { 565 len = sprefix(optname, oname->oname, uppercase); 566 if (len <= 0 || is_optchar(optname[len])) 567 { 568 /* 569 * We didn't use all of the option name. 570 */ 571 continue; 572 } 573 if (!exact && len == maxlen) 574 /* 575 * Already had a partial match, 576 * and now there's another one that 577 * matches the same length. 578 */ 579 ambig = 1; 580 else if (len > maxlen) 581 { 582 /* 583 * Found a better match than 584 * the one we had. 585 */ 586 maxo = o; 587 maxoname = oname; 588 maxlen = len; 589 ambig = 0; 590 exact = (len == (int)strlen(oname->oname)); 591 } 592 if (!(o->otype & TRIPLE)) 593 break; 594 } 595 } 596 } 597 if (ambig) 598 { 599 /* 600 * Name matched more than one option. 601 */ 602 if (p_err != NULL) 603 *p_err = OPT_AMBIG; 604 return (NULL); 605 } 606 *p_optname = optname + maxlen; 607 if (p_oname != NULL) 608 *p_oname = maxoname == NULL ? NULL : maxoname->oname; 609 return (maxo); 610 } 611