1 /* 2 * Copyright (C) 1984-2004 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 int chopline; /* Truncate displayed lines at screen width */ 44 public int no_init; /* Disable sending ti/te termcap strings */ 45 public int no_keypad; /* Disable sending ks/ke termcap strings */ 46 public int twiddle; /* Show tildes after EOF */ 47 public int show_attn; /* Hilite first unread line */ 48 public int shift_count; /* Number of positions to shift horizontally */ 49 public int status_col; /* Display a status column */ 50 public int use_lessopen; /* Use the LESSOPEN filter */ 51 public int quit_on_intr; /* Quit on interrupt */ 52 #if HILITE_SEARCH 53 public int hilite_search; /* Highlight matched search patterns? */ 54 #endif 55 56 public int less_is_more = 0; /* Make compatible with POSIX more */ 57 58 /* 59 * Long option names. 60 */ 61 static struct optname a_optname = { "search-skip-screen", NULL }; 62 static struct optname b_optname = { "buffers", NULL }; 63 static struct optname B__optname = { "auto-buffers", NULL }; 64 static struct optname c_optname = { "clear-screen", NULL }; 65 static struct optname d_optname = { "dumb", NULL }; 66 #if MSDOS_COMPILER 67 static struct optname D__optname = { "color", NULL }; 68 #endif 69 static struct optname e_optname = { "quit-at-eof", NULL }; 70 static struct optname f_optname = { "force", NULL }; 71 static struct optname F__optname = { "quit-if-one-screen", NULL }; 72 #if HILITE_SEARCH 73 static struct optname g_optname = { "hilite-search", NULL }; 74 #endif 75 static struct optname h_optname = { "max-back-scroll", NULL }; 76 static struct optname i_optname = { "ignore-case", NULL }; 77 static struct optname j_optname = { "jump-target", NULL }; 78 static struct optname J__optname = { "status-column", NULL }; 79 #if USERFILE 80 static struct optname k_optname = { "lesskey-file", NULL }; 81 #endif 82 static struct optname K__optname = { "quit-on-intr", NULL }; 83 static struct optname L__optname = { "no-lessopen", NULL }; 84 static struct optname m_optname = { "long-prompt", NULL }; 85 static struct optname n_optname = { "line-numbers", NULL }; 86 #if LOGFILE 87 static struct optname o_optname = { "log-file", NULL }; 88 static struct optname O__optname = { "LOG-FILE", NULL }; 89 #endif 90 static struct optname p_optname = { "pattern", NULL }; 91 static struct optname P__optname = { "prompt", NULL }; 92 static struct optname q2_optname = { "silent", NULL }; 93 static struct optname q_optname = { "quiet", &q2_optname }; 94 static struct optname r_optname = { "raw-control-chars", NULL }; 95 static struct optname s_optname = { "squeeze-blank-lines", NULL }; 96 static struct optname S__optname = { "chop-long-lines", NULL }; 97 #if TAGS 98 static struct optname t_optname = { "tag", NULL }; 99 static struct optname T__optname = { "tag-file", NULL }; 100 #endif 101 static struct optname u_optname = { "underline-special", NULL }; 102 static struct optname V__optname = { "version", NULL }; 103 static struct optname w_optname = { "hilite-unread", NULL }; 104 static struct optname x_optname = { "tabs", NULL }; 105 static struct optname X__optname = { "no-init", NULL }; 106 static struct optname y_optname = { "max-forw-scroll", NULL }; 107 static struct optname z_optname = { "window", NULL }; 108 static struct optname quote_optname = { "quotes", NULL }; 109 static struct optname tilde_optname = { "tilde", NULL }; 110 static struct optname query_optname = { "help", NULL }; 111 static struct optname pound_optname = { "shift", NULL }; 112 static struct optname keypad_optname = { "no-keypad", NULL }; 113 114 115 /* 116 * Table of all options and their semantics. 117 * 118 * For BOOL and TRIPLE options, odesc[0], odesc[1], odesc[2] are 119 * the description of the option when set to 0, 1 or 2, respectively. 120 * For NUMBER options, odesc[0] is the prompt to use when entering 121 * a new value, and odesc[1] is the description, which should contain 122 * one %d which is replaced by the value of the number. 123 * For STRING options, odesc[0] is the prompt to use when entering 124 * a new value, and odesc[1], if not NULL, is the set of characters 125 * that are valid in the string. 126 */ 127 static struct loption option[] = 128 { 129 { 'a', &a_optname, 130 BOOL, OPT_OFF, &how_search, NULL, 131 { 132 "Search includes displayed screen", 133 "Search skips displayed screen", 134 NULL 135 } 136 }, 137 138 { 'b', &b_optname, 139 NUMBER|INIT_HANDLER, 64, &bufspace, opt_b, 140 { 141 "Max buffer space per file (K): ", 142 "Max buffer space per file: %dK", 143 NULL 144 } 145 }, 146 { 'B', &B__optname, 147 BOOL, OPT_ON, &autobuf, NULL, 148 { 149 "Don't automatically allocate buffers", 150 "Automatically allocate buffers when needed", 151 NULL 152 } 153 }, 154 { 'c', &c_optname, 155 TRIPLE, OPT_OFF, &top_scroll, NULL, 156 { 157 "Repaint by scrolling from bottom of screen", 158 "Repaint by clearing each line", 159 "Repaint by painting from top of screen" 160 } 161 }, 162 { 'd', &d_optname, 163 BOOL|NO_TOGGLE, OPT_OFF, &know_dumb, NULL, 164 { 165 "Assume intelligent terminal", 166 "Assume dumb terminal", 167 NULL 168 } 169 }, 170 #if MSDOS_COMPILER 171 { 'D', &D__optname, 172 STRING|REPAINT|NO_QUERY, 0, NULL, opt_D, 173 { 174 "color desc: ", 175 "Ddknsu0123456789.", 176 NULL 177 } 178 }, 179 #endif 180 { 'e', &e_optname, 181 TRIPLE, OPT_OFF, &quit_at_eof, NULL, 182 { 183 "Don't quit at end-of-file", 184 "Quit at end-of-file", 185 "Quit immediately at end-of-file" 186 } 187 }, 188 { 'f', &f_optname, 189 BOOL, OPT_OFF, &force_open, NULL, 190 { 191 "Open only regular files", 192 "Open even non-regular files", 193 NULL 194 } 195 }, 196 { 'F', &F__optname, 197 BOOL, OPT_OFF, &quit_if_one_screen, NULL, 198 { 199 "Don't quit if end-of-file on first screen", 200 "Quit if end-of-file on first screen", 201 NULL 202 } 203 }, 204 #if HILITE_SEARCH 205 { 'g', &g_optname, 206 TRIPLE|HL_REPAINT, OPT_ONPLUS, &hilite_search, NULL, 207 { 208 "Don't highlight search matches", 209 "Highlight matches for previous search only", 210 "Highlight all matches for previous search pattern", 211 } 212 }, 213 #endif 214 { 'h', &h_optname, 215 NUMBER, -1, &back_scroll, NULL, 216 { 217 "Backwards scroll limit: ", 218 "Backwards scroll limit is %d lines", 219 NULL 220 } 221 }, 222 { 'i', &i_optname, 223 TRIPLE|HL_REPAINT, OPT_OFF, &caseless, opt_i, 224 { 225 "Case is significant in searches", 226 "Ignore case in searches", 227 "Ignore case in searches and in patterns" 228 } 229 }, 230 { 'j', &j_optname, 231 NUMBER, 1, &jump_sline, NULL, 232 { 233 "Target line: ", 234 "Position target at screen line %d", 235 NULL 236 } 237 }, 238 { 'J', &J__optname, 239 BOOL|REPAINT, OPT_OFF, &status_col, NULL, 240 { 241 "Don't display a status column", 242 "Display a status column", 243 NULL 244 } 245 }, 246 #if USERFILE 247 { 'k', &k_optname, 248 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_k, 249 { NULL, NULL, NULL } 250 }, 251 #endif 252 { 'K', &K__optname, 253 BOOL, OPT_OFF, &quit_on_intr, NULL, 254 { 255 "Interrupt (ctrl-C) returns to prompt", 256 "Interrupt (ctrl-C) exits less", 257 NULL 258 } 259 }, 260 { 'l', NULL, 261 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_l, 262 { NULL, NULL, NULL } 263 }, 264 { 'L', &L__optname, 265 BOOL, OPT_ON, &use_lessopen, NULL, 266 { 267 "Don't use the LESSOPEN filter", 268 "Use the LESSOPEN filter", 269 NULL 270 } 271 }, 272 { 'm', &m_optname, 273 TRIPLE, OPT_OFF, &pr_type, NULL, 274 { 275 "Short prompt", 276 "Medium prompt", 277 "Long prompt" 278 } 279 }, 280 { 'n', &n_optname, 281 TRIPLE|REPAINT, OPT_ON, &linenums, NULL, 282 { 283 "Don't use line numbers", 284 "Use line numbers", 285 "Constantly display line numbers" 286 } 287 }, 288 #if LOGFILE 289 { 'o', &o_optname, 290 STRING, 0, NULL, opt_o, 291 { "log file: ", NULL, NULL } 292 }, 293 { 'O', &O__optname, 294 STRING, 0, NULL, opt__O, 295 { "Log file: ", NULL, NULL } 296 }, 297 #endif 298 { 'p', &p_optname, 299 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_p, 300 { NULL, NULL, NULL } 301 }, 302 { 'P', &P__optname, 303 STRING, 0, NULL, opt__P, 304 { "prompt: ", NULL, NULL } 305 }, 306 { 'q', &q_optname, 307 TRIPLE, OPT_OFF, &quiet, NULL, 308 { 309 "Ring the bell for errors AND at eof/bof", 310 "Ring the bell for errors but not at eof/bof", 311 "Never ring the bell" 312 } 313 }, 314 { 'r', &r_optname, 315 TRIPLE|REPAINT, OPT_OFF, &ctldisp, NULL, 316 { 317 "Display control characters as ^X", 318 "Display control characters directly", 319 "Display control characters directly, processing ANSI sequences" 320 } 321 }, 322 { 's', &s_optname, 323 BOOL|REPAINT, OPT_OFF, &squeeze, NULL, 324 { 325 "Display all blank lines", 326 "Squeeze multiple blank lines", 327 NULL 328 } 329 }, 330 { 'S', &S__optname, 331 BOOL|REPAINT, OPT_OFF, &chopline, NULL, 332 { 333 "Fold long lines", 334 "Chop long lines", 335 NULL 336 } 337 }, 338 #if TAGS 339 { 't', &t_optname, 340 STRING|NO_QUERY, 0, NULL, opt_t, 341 { "tag: ", NULL, NULL } 342 }, 343 { 'T', &T__optname, 344 STRING, 0, NULL, opt__T, 345 { "tags file: ", NULL, NULL } 346 }, 347 #endif 348 { 'u', &u_optname, 349 TRIPLE|REPAINT, OPT_OFF, &bs_mode, NULL, 350 { 351 "Display underlined text in underline mode", 352 "Backspaces cause overstrike", 353 "Print backspace as ^H" 354 } 355 }, 356 { 'V', &V__optname, 357 NOVAR, 0, NULL, opt__V, 358 { NULL, NULL, NULL } 359 }, 360 { 'w', &w_optname, 361 TRIPLE|REPAINT, OPT_OFF, &show_attn, NULL, 362 { 363 "Don't highlight first unread line", 364 "Highlight first unread line after forward-screen", 365 "Highlight first unread line after any forward movement", 366 } 367 }, 368 { 'x', &x_optname, 369 STRING|REPAINT, 0, NULL, opt_x, 370 { 371 "Tab stops: ", 372 "0123456789,", 373 NULL 374 } 375 }, 376 { 'X', &X__optname, 377 BOOL|NO_TOGGLE, OPT_OFF, &no_init, NULL, 378 { 379 "Send init/deinit strings to terminal", 380 "Don't use init/deinit strings", 381 NULL 382 } 383 }, 384 { 'y', &y_optname, 385 NUMBER, -1, &forw_scroll, NULL, 386 { 387 "Forward scroll limit: ", 388 "Forward scroll limit is %d lines", 389 NULL 390 } 391 }, 392 { 'z', &z_optname, 393 NUMBER, -1, &swindow, NULL, 394 { 395 "Scroll window size: ", 396 "Scroll window size is %d lines", 397 NULL 398 } 399 }, 400 { '"', "e_optname, 401 STRING, 0, NULL, opt_quote, 402 { "quotes: ", NULL, NULL } 403 }, 404 { '~', &tilde_optname, 405 BOOL|REPAINT, OPT_ON, &twiddle, NULL, 406 { 407 "Don't show tildes after end of file", 408 "Show tildes after end of file", 409 NULL 410 } 411 }, 412 { '?', &query_optname, 413 NOVAR, 0, NULL, opt_query, 414 { NULL, NULL, NULL } 415 }, 416 { '#', £_optname, 417 NUMBER, 0, &shift_count, NULL, 418 { 419 "Horizontal shift: ", 420 "Horizontal shift %d positions", 421 NULL 422 } 423 }, 424 { '.', &keypad_optname, 425 BOOL|NO_TOGGLE, OPT_OFF, &no_keypad, NULL, 426 { 427 "Use keypad mode", 428 "Don't use keypad mode", 429 NULL 430 } 431 }, 432 { '\0', NULL, NOVAR, 0, NULL, NULL, { NULL, NULL, NULL } } 433 }; 434 435 436 /* 437 * Initialize each option to its default value. 438 */ 439 public void 440 init_option() 441 { 442 register struct loption *o; 443 char *p; 444 445 p = lgetenv("LESS_IS_MORE"); 446 if (p != NULL && *p != '\0') 447 less_is_more = 1; 448 449 for (o = option; o->oletter != '\0'; o++) 450 { 451 /* 452 * Set each variable to its default. 453 */ 454 if (o->ovar != NULL) 455 *(o->ovar) = o->odefault; 456 if (o->otype & INIT_HANDLER) 457 (*(o->ofunc))(INIT, (char *) NULL); 458 } 459 } 460 461 /* 462 * Find an option in the option table, given its option letter. 463 */ 464 public struct loption * 465 findopt(c) 466 int c; 467 { 468 register struct loption *o; 469 470 for (o = option; o->oletter != '\0'; o++) 471 { 472 if (o->oletter == c) 473 return (o); 474 if ((o->otype & TRIPLE) && ASCII_TO_UPPER(o->oletter) == c) 475 return (o); 476 } 477 return (NULL); 478 } 479 480 /* 481 * 482 */ 483 static int 484 is_optchar(c) 485 char c; 486 { 487 if (ASCII_IS_UPPER(c)) 488 return 1; 489 if (ASCII_IS_LOWER(c)) 490 return 1; 491 if (c == '-') 492 return 1; 493 return 0; 494 } 495 496 /* 497 * Find an option in the option table, given its option name. 498 * p_optname is the (possibly partial) name to look for, and 499 * is updated to point after the matched name. 500 * p_oname if non-NULL is set to point to the full option name. 501 */ 502 public struct loption * 503 findopt_name(p_optname, p_oname, p_err) 504 char **p_optname; 505 char **p_oname; 506 int *p_err; 507 { 508 char *optname = *p_optname; 509 register struct loption *o; 510 register struct optname *oname; 511 register int len; 512 int uppercase; 513 struct loption *maxo = NULL; 514 struct optname *maxoname = NULL; 515 int maxlen = 0; 516 int ambig = 0; 517 int exact = 0; 518 519 /* 520 * Check all options. 521 */ 522 for (o = option; o->oletter != '\0'; o++) 523 { 524 /* 525 * Check all names for this option. 526 */ 527 for (oname = o->onames; oname != NULL; oname = oname->onext) 528 { 529 /* 530 * Try normal match first (uppercase == 0), 531 * then, then if it's a TRIPLE option, 532 * try uppercase match (uppercase == 1). 533 */ 534 for (uppercase = 0; uppercase <= 1; uppercase++) 535 { 536 len = sprefix(optname, oname->oname, uppercase); 537 if (len <= 0 || is_optchar(optname[len])) 538 { 539 /* 540 * We didn't use all of the option name. 541 */ 542 continue; 543 } 544 if (!exact && len == maxlen) 545 /* 546 * Already had a partial match, 547 * and now there's another one that 548 * matches the same length. 549 */ 550 ambig = 1; 551 else if (len > maxlen) 552 { 553 /* 554 * Found a better match than 555 * the one we had. 556 */ 557 maxo = o; 558 maxoname = oname; 559 maxlen = len; 560 ambig = 0; 561 exact = (len == (int)strlen(oname->oname)); 562 } 563 if (!(o->otype & TRIPLE)) 564 break; 565 } 566 } 567 } 568 if (ambig) 569 { 570 /* 571 * Name matched more than one option. 572 */ 573 if (p_err != NULL) 574 *p_err = OPT_AMBIG; 575 return (NULL); 576 } 577 *p_optname = optname + maxlen; 578 if (p_oname != NULL) 579 *p_oname = maxoname == NULL ? NULL : maxoname->oname; 580 return (maxo); 581 } 582