1 /* 2 * Copyright (C) 1984-2012 Mark Nudelman 3 * Modified for use with illumos by Garrett D'Amore. 4 * Copyright 2014 Garrett D'Amore <garrett@damore.org> 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, see the README file. 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 int quiet; /* Should we suppress the audible bell? */ 23 int how_search; /* Where should forward searches start? */ 24 int top_scroll; /* Repaint screen from top? (vs scroll from bottom) */ 25 int pr_type; /* Type of prompt (short, medium, long) */ 26 int bs_mode; /* How to process backspaces */ 27 int know_dumb; /* Don't complain about dumb terminals */ 28 int quit_at_eof; /* Quit after hitting end of file twice */ 29 int quit_if_one_screen; /* Quit if EOF on first screen */ 30 int squeeze; /* Squeeze multiple blank lines into one */ 31 int back_scroll; /* Repaint screen on backwards movement */ 32 int forw_scroll; /* Repaint screen on forward movement */ 33 int caseless; /* Do "caseless" searches */ 34 int linenums; /* Use line numbers */ 35 int autobuf; /* Automatically allocate buffers as needed */ 36 int bufspace; /* Max buffer space per file (K) */ 37 int ctldisp; /* Send control chars to screen untranslated */ 38 int force_open; /* Open the file even if not regular file */ 39 int swindow; /* Size of scrolling window */ 40 int jump_sline; /* Screen line of "jump target" */ 41 long jump_sline_fraction = -1; 42 int chopline; /* Truncate displayed lines at screen width */ 43 int no_init; /* Disable sending ti/te termcap strings */ 44 int no_keypad; /* Disable sending ks/ke termcap strings */ 45 int twiddle; /* Show tildes after EOF */ 46 int show_attn; /* Hilite first unread line */ 47 int status_col; /* Display a status column */ 48 int use_lessopen; /* Use the LESSOPEN filter */ 49 int quit_on_intr; /* Quit on interrupt */ 50 int follow_mode; /* F cmd Follows file desc or file name? */ 51 int oldbot; /* Old bottom of screen behavior {{REMOVE}} */ 52 int opt_use_backslash; /* Use backslash escaping in option parsing */ 53 int hilite_search; /* Highlight matched search patterns? */ 54 55 int less_is_more = 0; /* Make compatible with POSIX more */ 56 57 /* 58 * Long option names. 59 */ 60 static struct optname a_optname = { "search-skip-screen", NULL }; 61 static struct optname b_optname = { "buffers", NULL }; 62 static struct optname B__optname = { "auto-buffers", NULL }; 63 static struct optname c_optname = { "clear-screen", NULL }; 64 static struct optname d_optname = { "dumb", NULL }; 65 static struct optname e_optname = { "quit-at-eof", NULL }; 66 static struct optname f_optname = { "force", NULL }; 67 static struct optname F__optname = { "quit-if-one-screen", NULL }; 68 static struct optname g_optname = { "hilite-search", NULL }; 69 static struct optname h_optname = { "max-back-scroll", NULL }; 70 static struct optname i_optname = { "ignore-case", NULL }; 71 static struct optname j_optname = { "jump-target", NULL }; 72 static struct optname J__optname = { "status-column", NULL }; 73 static struct optname k_optname = { "lesskey-file", NULL }; 74 static struct optname K__optname = { "quit-on-intr", NULL }; 75 static struct optname L__optname = { "no-lessopen", NULL }; 76 static struct optname m_optname = { "long-prompt", NULL }; 77 static struct optname n_optname = { "line-numbers", NULL }; 78 static struct optname o_optname = { "log-file", NULL }; 79 static struct optname O__optname = { "LOG-FILE", NULL }; 80 static struct optname p_optname = { "pattern", NULL }; 81 static struct optname P__optname = { "prompt", NULL }; 82 static struct optname q2_optname = { "silent", NULL }; 83 static struct optname q_optname = { "quiet", &q2_optname }; 84 static struct optname r_optname = { "raw-control-chars", NULL }; 85 static struct optname s_optname = { "squeeze-blank-lines", NULL }; 86 static struct optname S__optname = { "chop-long-lines", NULL }; 87 static struct optname t_optname = { "tag", NULL }; 88 static struct optname T__optname = { "tag-file", NULL }; 89 static struct optname u_optname = { "underline-special", NULL }; 90 static struct optname V__optname = { "version", NULL }; 91 static struct optname w_optname = { "hilite-unread", NULL }; 92 static struct optname x_optname = { "tabs", NULL }; 93 static struct optname X__optname = { "no-init", NULL }; 94 static struct optname y_optname = { "max-forw-scroll", NULL }; 95 static struct optname z_optname = { "window", NULL }; 96 static struct optname quote_optname = { "quotes", NULL }; 97 static struct optname tilde_optname = { "tilde", NULL }; 98 static struct optname query_optname = { "help", NULL }; 99 static struct optname pound_optname = { "shift", NULL }; 100 static struct optname keypad_optname = { "no-keypad", NULL }; 101 static struct optname oldbot_optname = { "old-bot", NULL }; 102 static struct optname follow_optname = { "follow-name", NULL }; 103 static struct optname use_backslash_optname = { "use-backslash", NULL }; 104 105 106 /* 107 * Table of all options and their semantics. 108 * 109 * For BOOL and TRIPLE options, odesc[0], odesc[1], odesc[2] are 110 * the description of the option when set to 0, 1 or 2, respectively. 111 * For NUMBER options, odesc[0] is the prompt to use when entering 112 * a new value, and odesc[1] is the description, which should contain 113 * one %d which is replaced by the value of the number. 114 * For STRING options, odesc[0] is the prompt to use when entering 115 * a new value, and odesc[1], if not NULL, is the set of characters 116 * that are valid in the string. 117 */ 118 static struct loption option[] = { 119 { 'a', &a_optname, 120 TRIPLE, OPT_ONPLUS, &how_search, NULL, 121 { 122 "Search includes displayed screen", 123 "Search skips displayed screen", 124 "Search includes all of displayed screen" 125 } 126 }, 127 128 { 'b', &b_optname, 129 NUMBER|INIT_HANDLER, 64, &bufspace, opt_b, 130 { 131 "Max buffer space per file (K): ", 132 "Max buffer space per file: %dK", 133 NULL 134 } 135 }, 136 { 'B', &B__optname, 137 BOOL, OPT_ON, &autobuf, NULL, 138 { 139 "Don't automatically allocate buffers", 140 "Automatically allocate buffers when needed", 141 NULL 142 } 143 }, 144 { 'c', &c_optname, 145 TRIPLE|MORE_OK, OPT_ON, &top_scroll, NULL, 146 { 147 "Repaint by scrolling from bottom of screen", 148 "Repaint by painting from top of screen", 149 "Repaint by painting from top of screen" 150 } 151 }, 152 { 'd', &d_optname, 153 BOOL|MORE_OK|NO_TOGGLE, OPT_OFF, &know_dumb, NULL, 154 { 155 "Assume intelligent terminal", 156 "Assume dumb terminal", 157 NULL 158 } 159 }, 160 { 'e', &e_optname, 161 TRIPLE, OPT_OFF, &quit_at_eof, NULL, 162 { 163 "Don't quit at end-of-file", 164 "Quit at end-of-file", 165 "Quit immediately at end-of-file" 166 } 167 }, 168 { 'f', &f_optname, 169 BOOL, OPT_OFF, &force_open, NULL, 170 { 171 "Open only regular files", 172 "Open even non-regular files", 173 NULL 174 } 175 }, 176 { 'F', &F__optname, 177 BOOL, OPT_OFF, &quit_if_one_screen, NULL, 178 { 179 "Don't quit if end-of-file on first screen", 180 "Quit if end-of-file on first screen", 181 NULL 182 } 183 }, 184 { 'g', &g_optname, 185 TRIPLE|HL_REPAINT, OPT_ONPLUS, &hilite_search, NULL, 186 { 187 "Don't highlight search matches", 188 "Highlight matches for previous search only", 189 "Highlight all matches for previous search pattern", 190 } 191 }, 192 { 'h', &h_optname, 193 NUMBER, -1, &back_scroll, NULL, 194 { 195 "Backwards scroll limit: ", 196 "Backwards scroll limit is %d lines", 197 NULL 198 } 199 }, 200 { 'i', &i_optname, 201 TRIPLE|HL_REPAINT, OPT_OFF, &caseless, opt_i, 202 { 203 "Case is significant in searches", 204 "Ignore case in searches", 205 "Ignore case in searches and in patterns" 206 } 207 }, 208 { 'j', &j_optname, 209 STRING, 0, NULL, opt_j, 210 { 211 "Target line: ", 212 "0123456789.-", 213 NULL 214 } 215 }, 216 { 'J', &J__optname, 217 BOOL|REPAINT, OPT_OFF, &status_col, NULL, 218 { 219 "Don't display a status column", 220 "Display a status column", 221 NULL 222 } 223 }, 224 { 'k', &k_optname, 225 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_k, 226 { NULL, NULL, NULL } 227 }, 228 { 'K', &K__optname, 229 BOOL, OPT_OFF, &quit_on_intr, NULL, 230 { 231 "Interrupt (ctrl-C) returns to prompt", 232 "Interrupt (ctrl-C) exits less", 233 NULL 234 } 235 }, 236 { 'L', &L__optname, 237 BOOL, OPT_ON, &use_lessopen, NULL, 238 { 239 "Don't use the LESSOPEN filter", 240 "Use the LESSOPEN filter", 241 NULL 242 } 243 }, 244 { 'm', &m_optname, 245 TRIPLE, OPT_OFF, &pr_type, NULL, 246 { 247 "Short prompt", 248 "Medium prompt", 249 "Long prompt" 250 } 251 }, 252 { 'n', &n_optname, 253 TRIPLE|REPAINT, OPT_ON, &linenums, NULL, 254 { 255 "Don't use line numbers", 256 "Use line numbers", 257 "Constantly display line numbers" 258 } 259 }, 260 { 'o', &o_optname, 261 STRING, 0, NULL, opt_o, 262 { "log file: ", NULL, NULL } 263 }, 264 { 'O', &O__optname, 265 STRING, 0, NULL, opt__O, 266 { "Log file: ", NULL, NULL } 267 }, 268 { 'p', &p_optname, 269 STRING|NO_TOGGLE|NO_QUERY|MORE_OK, 0, NULL, opt_p, 270 { NULL, NULL, NULL } 271 }, 272 { 'P', &P__optname, 273 STRING, 0, NULL, opt__P, 274 { "prompt: ", NULL, NULL } 275 }, 276 { 'q', &q_optname, 277 TRIPLE, OPT_OFF, &quiet, NULL, 278 { 279 "Ring the bell for errors AND at eof/bof", 280 "Ring the bell for errors but not at eof/bof", 281 "Never ring the bell" 282 } 283 }, 284 { 'r', &r_optname, 285 TRIPLE|REPAINT, OPT_OFF, &ctldisp, NULL, 286 { 287 "Display control characters as ^X", 288 "Display control characters directly", 289 "Display control characters directly, " 290 "processing ANSI sequences" 291 } 292 }, 293 { 's', &s_optname, 294 BOOL|REPAINT|MORE_OK, OPT_OFF, &squeeze, NULL, 295 { 296 "Display all blank lines", 297 "Squeeze multiple blank lines", 298 NULL 299 } 300 }, 301 { 'S', &S__optname, 302 BOOL|REPAINT, OPT_OFF, &chopline, NULL, 303 { 304 "Fold long lines", 305 "Chop long lines", 306 NULL 307 } 308 }, 309 { 't', &t_optname, 310 STRING|NO_QUERY|MORE_OK, 0, NULL, opt_t, 311 { "tag: ", NULL, NULL } 312 }, 313 { 'T', &T__optname, 314 STRING|MORE_OK, 0, NULL, opt__T, 315 { "tags file: ", NULL, NULL } 316 }, 317 { 'u', &u_optname, 318 TRIPLE|REPAINT, OPT_OFF, &bs_mode, NULL, 319 { 320 "Display underlined text in underline mode", 321 "Backspaces cause overstrike", 322 "Print backspace as ^H" 323 } 324 }, 325 { 'V', &V__optname, 326 NOVAR, 0, NULL, opt__V, 327 { NULL, NULL, NULL } 328 }, 329 { 'w', &w_optname, 330 TRIPLE|REPAINT, OPT_OFF, &show_attn, NULL, 331 { 332 "Don't highlight first unread line", 333 "Highlight first unread line after forward-screen", 334 "Highlight first unread line after any " 335 "forward movement", 336 } 337 }, 338 { 'x', &x_optname, 339 STRING|REPAINT, 0, NULL, opt_x, 340 { 341 "Tab stops: ", 342 "0123456789,", 343 NULL 344 } 345 }, 346 { 'X', &X__optname, 347 BOOL|NO_TOGGLE, OPT_OFF, &no_init, NULL, 348 { 349 "Send init/deinit strings to terminal", 350 "Don't use init/deinit strings", 351 NULL 352 } 353 }, 354 { 'y', &y_optname, 355 NUMBER, -1, &forw_scroll, NULL, 356 { 357 "Forward scroll limit: ", 358 "Forward scroll limit is %d lines", 359 NULL 360 } 361 }, 362 { 'z', &z_optname, 363 NUMBER, -1, &swindow, NULL, 364 { 365 "Scroll window size: ", 366 "Scroll window size is %d lines", 367 NULL 368 } 369 }, 370 { '"', "e_optname, 371 STRING, 0, NULL, opt_quote, 372 { "quotes: ", NULL, NULL } 373 }, 374 { '~', &tilde_optname, 375 BOOL|REPAINT, OPT_ON, &twiddle, NULL, 376 { 377 "Don't show tildes after end of file", 378 "Show tildes after end of file", 379 NULL 380 } 381 }, 382 { '?', &query_optname, 383 NOVAR, 0, NULL, opt_query, 384 { NULL, NULL, NULL } 385 }, 386 { '#', £_optname, 387 STRING, 0, NULL, opt_shift, 388 { 389 "Horizontal shift: ", 390 "0123456789.", 391 NULL 392 } 393 }, 394 { OLETTER_NONE, &keypad_optname, 395 BOOL|NO_TOGGLE, OPT_OFF, &no_keypad, NULL, 396 { 397 "Use keypad mode", 398 "Don't use keypad mode", 399 NULL 400 } 401 }, 402 { OLETTER_NONE, &oldbot_optname, 403 BOOL, OPT_OFF, &oldbot, NULL, 404 { 405 "Use new bottom of screen behavior", 406 "Use old bottom of screen behavior", 407 NULL 408 } 409 }, 410 { OLETTER_NONE, &follow_optname, 411 BOOL, FOLLOW_DESC, &follow_mode, NULL, 412 { 413 "F command follows file descriptor", 414 "F command follows file name", 415 NULL 416 } 417 }, 418 { OLETTER_NONE, &use_backslash_optname, 419 BOOL, OPT_OFF, &opt_use_backslash, NULL, 420 { 421 "Use backslash escaping in command line parameters", 422 "Don't use backslash escaping in command line " 423 "parameters", 424 NULL 425 } 426 }, 427 { '\0', NULL, NOVAR, 0, NULL, NULL, { NULL, NULL, NULL } } 428 }; 429 430 431 /* 432 * Initialize each option to its default value. 433 */ 434 void 435 init_option(void) 436 { 437 struct loption *o; 438 439 for (o = option; o->oletter != '\0'; o++) { 440 /* 441 * Set each variable to its default. 442 */ 443 if (o->ovar != NULL) 444 *(o->ovar) = o->odefault; 445 if (o->otype & INIT_HANDLER) 446 (*(o->ofunc))(INIT, NULL); 447 } 448 } 449 450 /* 451 * Find an option in the option table, given its option letter. 452 */ 453 struct loption * 454 findopt(int c) 455 { 456 struct loption *o; 457 458 for (o = option; o->oletter != '\0'; o++) { 459 if (o->oletter == c) 460 return (o); 461 if ((o->otype & TRIPLE) && 462 (toupper((unsigned char)o->oletter) == c)) 463 return (o); 464 } 465 return (NULL); 466 } 467 468 /* 469 * 470 */ 471 static int 472 is_optchar(unsigned char c) 473 { 474 if (isupper(c) || islower(c) || c == '-') 475 return (1); 476 else 477 return (0); 478 } 479 480 /* 481 * Find an option in the option table, given its option name. 482 * p_optname is the (possibly partial) name to look for, and 483 * is updated to point after the matched name. 484 * p_oname if non-NULL is set to point to the full option name. 485 */ 486 struct loption * 487 findopt_name(char **p_optname, char **p_oname, int *p_err) 488 { 489 char *optname = *p_optname; 490 struct loption *o; 491 struct optname *oname; 492 int len; 493 int uppercase; 494 struct loption *maxo = NULL; 495 struct optname *maxoname = NULL; 496 int maxlen = 0; 497 int ambig = 0; 498 int exact = 0; 499 500 /* 501 * Check all options. 502 */ 503 for (o = option; o->oletter != '\0'; o++) { 504 /* 505 * Check all names for this option. 506 */ 507 for (oname = o->onames; oname != NULL; oname = oname->onext) { 508 /* 509 * Try normal match first (uppercase == 0), 510 * then, then if it's a TRIPLE option, 511 * try uppercase match (uppercase == 1). 512 */ 513 for (uppercase = 0; uppercase <= 1; uppercase++) { 514 len = sprefix(optname, oname->oname, uppercase); 515 if (len <= 0 || is_optchar(optname[len])) { 516 /* 517 * We didn't use all of the option name. 518 */ 519 continue; 520 } 521 if (!exact && len == maxlen) { 522 /* 523 * Already had a partial match, 524 * and now there's another one that 525 * matches the same length. 526 */ 527 ambig = 1; 528 } else if (len > maxlen) { 529 /* 530 * Found a better match than 531 * the one we had. 532 */ 533 maxo = o; 534 maxoname = oname; 535 maxlen = len; 536 ambig = 0; 537 exact = (len == strlen(oname->oname)); 538 } 539 if (!(o->otype & TRIPLE)) 540 break; 541 } 542 } 543 } 544 if (ambig) { 545 /* 546 * Name matched more than one option. 547 */ 548 if (p_err != NULL) 549 *p_err = OPT_AMBIG; 550 return (NULL); 551 } 552 *p_optname = optname + maxlen; 553 if (p_oname != NULL) 554 *p_oname = maxoname == NULL ? NULL : maxoname->oname; 555 return (maxo); 556 } 557