opttbl.c revision 1.3.8.1
1/* $NetBSD: opttbl.c,v 1.3.8.1 2014/08/19 23:46:50 tls Exp $ */ 2 3/* 4 * Copyright (C) 1984-2012 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, see the README file. 10 */ 11 12 13/* 14 * The option table. 15 */ 16 17#include "less.h" 18#include "option.h" 19 20/* 21 * Variables controlled by command line options. 22 */ 23public int quiet; /* Should we suppress the audible bell? */ 24public int how_search; /* Where should forward searches start? */ 25public int top_scroll; /* Repaint screen from top? 26 (alternative is scroll from bottom) */ 27public int pr_type; /* Type of prompt (short, medium, long) */ 28public int bs_mode; /* How to process backspaces */ 29public int know_dumb; /* Don't complain about dumb terminals */ 30public int quit_at_eof; /* Quit after hitting end of file twice */ 31public int quit_if_one_screen; /* Quit if EOF on first screen */ 32public int be_helpful; /* more(1) style -d */ 33public int squeeze; /* Squeeze multiple blank lines into one */ 34public int tabstop; /* Tab settings */ 35public int back_scroll; /* Repaint screen on backwards movement */ 36public int forw_scroll; /* Repaint screen on forward movement */ 37public int caseless; /* Do "caseless" searches */ 38public int linenums; /* Use line numbers */ 39public int autobuf; /* Automatically allocate buffers as needed */ 40public int bufspace; /* Max buffer space per file (K) */ 41public int ctldisp; /* Send control chars to screen untranslated */ 42public int force_open; /* Open the file even if not regular file */ 43public int swindow; /* Size of scrolling window */ 44public int jump_sline; /* Screen line of "jump target" */ 45public long jump_sline_fraction = -1; 46public long shift_count_fraction = -1; 47public int chopline; /* Truncate displayed lines at screen width */ 48public int no_init; /* Disable sending ti/te termcap strings */ 49public int no_keypad; /* Disable sending ks/ke termcap strings */ 50public int twiddle; /* Show tildes after EOF */ 51public int show_attn; /* Hilite first unread line */ 52public int shift_count; /* Number of positions to shift horizontally */ 53public int status_col; /* Display a status column */ 54public int use_lessopen; /* Use the LESSOPEN filter */ 55public int quit_on_intr; /* Quit on interrupt */ 56public int follow_mode; /* F cmd Follows file desc or file name? */ 57public int oldbot; /* Old bottom of screen behavior {{REMOVE}} */ 58public int opt_use_backslash; /* Use backslash escaping in option parsing */ 59#if HILITE_SEARCH 60public int hilite_search; /* Highlight matched search patterns? */ 61#endif 62 63public int less_is_more = 0; /* Make compatible with POSIX more */ 64 65/* 66 * Long option names. 67 */ 68static struct optname a_optname = { "search-skip-screen", NULL }; 69static struct optname b_optname = { "buffers", NULL }; 70static struct optname B__optname = { "auto-buffers", NULL }; 71static struct optname c_optname = { "clear-screen", NULL }; 72static struct optname d_optname = { "dumb", NULL }; 73#if MSDOS_COMPILER 74static struct optname D__optname = { "color", NULL }; 75#endif 76static struct optname e_optname = { "quit-at-eof", NULL }; 77static struct optname f_optname = { "force", NULL }; 78static struct optname F__optname = { "quit-if-one-screen", NULL }; 79#if HILITE_SEARCH 80static struct optname g_optname = { "hilite-search", NULL }; 81#endif 82static struct optname h_optname = { "max-back-scroll", NULL }; 83static struct optname i_optname = { "ignore-case", NULL }; 84static struct optname j_optname = { "jump-target", NULL }; 85static struct optname J__optname = { "status-column", NULL }; 86#if USERFILE 87static struct optname k_optname = { "lesskey-file", NULL }; 88#endif 89static struct optname K__optname = { "quit-on-intr", NULL }; 90static struct optname L__optname = { "no-lessopen", NULL }; 91static struct optname m_optname = { "long-prompt", NULL }; 92static struct optname n_optname = { "line-numbers", NULL }; 93#if LOGFILE 94static struct optname o_optname = { "log-file", NULL }; 95static struct optname O__optname = { "LOG-FILE", NULL }; 96#endif 97static struct optname p_optname = { "pattern", NULL }; 98static struct optname P__optname = { "prompt", NULL }; 99static struct optname q2_optname = { "silent", NULL }; 100static struct optname q_optname = { "quiet", &q2_optname }; 101static struct optname r_optname = { "raw-control-chars", NULL }; 102static struct optname s_optname = { "squeeze-blank-lines", NULL }; 103static struct optname S__optname = { "chop-long-lines", NULL }; 104#if TAGS 105static struct optname t_optname = { "tag", NULL }; 106static struct optname T__optname = { "tag-file", NULL }; 107#endif 108static struct optname u_optname = { "underline-special", NULL }; 109static struct optname V__optname = { "version", NULL }; 110static struct optname w_optname = { "hilite-unread", NULL }; 111static struct optname x_optname = { "tabs", NULL }; 112static struct optname X__optname = { "no-init", NULL }; 113static struct optname y_optname = { "max-forw-scroll", NULL }; 114static struct optname z_optname = { "window", NULL }; 115static struct optname quote_optname = { "quotes", NULL }; 116static struct optname tilde_optname = { "tilde", NULL }; 117static struct optname query_optname = { "help", NULL }; 118static struct optname pound_optname = { "shift", NULL }; 119static struct optname keypad_optname = { "no-keypad", NULL }; 120static struct optname oldbot_optname = { "old-bot", NULL }; 121static struct optname follow_optname = { "follow-name", NULL }; 122static struct optname use_backslash_optname = { "use-backslash", 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 */ 137static 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#if 1 173 { 'd', &d_optname, 174 BOOL, OPT_OFF, &be_helpful, NULL, 175 { "Be less helpful in prompts", 176 "Be helpful in prompts", 177 NULL } 178 }, 179#endif 180 { -1, &d_optname, 181 BOOL|NO_TOGGLE, OPT_OFF, &know_dumb, NULL, 182 { 183 "Assume intelligent terminal", 184 "Assume dumb terminal", 185 NULL 186 } 187 }, 188#if MSDOS_COMPILER 189 { 'D', &D__optname, 190 STRING|REPAINT|NO_QUERY, 0, NULL, opt_D, 191 { 192 "color desc: ", 193 "Ddknsu0123456789.", 194 NULL 195 } 196 }, 197#endif 198 { 'e', &e_optname, 199 TRIPLE, OPT_OFF, &quit_at_eof, NULL, 200 { 201 "Don't quit at end-of-file", 202 "Quit at end-of-file", 203 "Quit immediately at end-of-file" 204 } 205 }, 206 { 'f', &f_optname, 207 BOOL, OPT_OFF, &force_open, NULL, 208 { 209 "Open only regular files", 210 "Open even non-regular files", 211 NULL 212 } 213 }, 214 { 'F', &F__optname, 215 BOOL, OPT_OFF, &quit_if_one_screen, NULL, 216 { 217 "Don't quit if end-of-file on first screen", 218 "Quit if end-of-file on first screen", 219 NULL 220 } 221 }, 222#if HILITE_SEARCH 223 { 'g', &g_optname, 224 TRIPLE|HL_REPAINT, OPT_ONPLUS, &hilite_search, NULL, 225 { 226 "Don't highlight search matches", 227 "Highlight matches for previous search only", 228 "Highlight all matches for previous search pattern", 229 } 230 }, 231#endif 232 { 'h', &h_optname, 233 NUMBER, -1, &back_scroll, NULL, 234 { 235 "Backwards scroll limit: ", 236 "Backwards scroll limit is %d lines", 237 NULL 238 } 239 }, 240 { 'i', &i_optname, 241 TRIPLE|HL_REPAINT, OPT_OFF, &caseless, opt_i, 242 { 243 "Case is significant in searches", 244 "Ignore case in searches", 245 "Ignore case in searches and in patterns" 246 } 247 }, 248 { 'j', &j_optname, 249 STRING, 0, NULL, opt_j, 250 { 251 "Target line: ", 252 "0123456789.-", 253 NULL 254 } 255 }, 256 { 'J', &J__optname, 257 BOOL|REPAINT, OPT_OFF, &status_col, NULL, 258 { 259 "Don't display a status column", 260 "Display a status column", 261 NULL 262 } 263 }, 264#if USERFILE 265 { 'k', &k_optname, 266 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_k, 267 { NULL, NULL, NULL } 268 }, 269#endif 270 { 'K', &K__optname, 271 BOOL, OPT_OFF, &quit_on_intr, NULL, 272 { 273 "Interrupt (ctrl-C) returns to prompt", 274 "Interrupt (ctrl-C) exits less", 275 NULL 276 } 277 }, 278 { 'L', &L__optname, 279 BOOL, OPT_ON, &use_lessopen, NULL, 280 { 281 "Don't use the LESSOPEN filter", 282 "Use the LESSOPEN filter", 283 NULL 284 } 285 }, 286 { 'm', &m_optname, 287 TRIPLE, OPT_OFF, &pr_type, NULL, 288 { 289 "Short prompt", 290 "Medium prompt", 291 "Long prompt" 292 } 293 }, 294 { 'n', &n_optname, 295 TRIPLE|REPAINT, OPT_ON, &linenums, NULL, 296 { 297 "Don't use line numbers", 298 "Use line numbers", 299 "Constantly display line numbers" 300 } 301 }, 302#if LOGFILE 303 { 'o', &o_optname, 304 STRING, 0, NULL, opt_o, 305 { "log file: ", NULL, NULL } 306 }, 307 { 'O', &O__optname, 308 STRING, 0, NULL, opt__O, 309 { "Log file: ", NULL, NULL } 310 }, 311#endif 312 { 'p', &p_optname, 313 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_p, 314 { NULL, NULL, NULL } 315 }, 316 { 'P', &P__optname, 317 STRING, 0, NULL, opt__P, 318 { "prompt: ", NULL, NULL } 319 }, 320 { 'q', &q_optname, 321 TRIPLE, OPT_OFF, &quiet, NULL, 322 { 323 "Ring the bell for errors AND at eof/bof", 324 "Ring the bell for errors but not at eof/bof", 325 "Never ring the bell" 326 } 327 }, 328 { 'r', &r_optname, 329 TRIPLE|REPAINT, OPT_OFF, &ctldisp, NULL, 330 { 331 "Display control characters as ^X", 332 "Display control characters directly", 333 "Display control characters directly, processing ANSI sequences" 334 } 335 }, 336 { 's', &s_optname, 337 BOOL|REPAINT, OPT_OFF, &squeeze, NULL, 338 { 339 "Display all blank lines", 340 "Squeeze multiple blank lines", 341 NULL 342 } 343 }, 344 { 'S', &S__optname, 345 BOOL|REPAINT, OPT_OFF, &chopline, NULL, 346 { 347 "Fold long lines", 348 "Chop long lines", 349 NULL 350 } 351 }, 352#if TAGS 353 { 't', &t_optname, 354 STRING|NO_QUERY, 0, NULL, opt_t, 355 { "tag: ", NULL, NULL } 356 }, 357 { 'T', &T__optname, 358 STRING, 0, NULL, opt__T, 359 { "tags file: ", NULL, NULL } 360 }, 361#endif 362 { 'u', &u_optname, 363 TRIPLE|REPAINT, OPT_OFF, &bs_mode, NULL, 364 { 365 "Display underlined text in underline mode", 366 "Backspaces cause overstrike", 367 "Print backspace as ^H" 368 } 369 }, 370 { 'V', &V__optname, 371 NOVAR, 0, NULL, opt__V, 372 { NULL, NULL, NULL } 373 }, 374 { 'w', &w_optname, 375 TRIPLE|REPAINT, OPT_OFF, &show_attn, NULL, 376 { 377 "Don't highlight first unread line", 378 "Highlight first unread line after forward-screen", 379 "Highlight first unread line after any forward movement", 380 } 381 }, 382 { 'x', &x_optname, 383 STRING|REPAINT, 0, NULL, opt_x, 384 { 385 "Tab stops: ", 386 "0123456789,", 387 NULL 388 } 389 }, 390 { 'X', &X__optname, 391 BOOL|NO_TOGGLE, OPT_OFF, &no_init, NULL, 392 { 393 "Send init/deinit strings to terminal", 394 "Don't use init/deinit strings", 395 NULL 396 } 397 }, 398 { 'y', &y_optname, 399 NUMBER, -1, &forw_scroll, NULL, 400 { 401 "Forward scroll limit: ", 402 "Forward scroll limit is %d lines", 403 NULL 404 } 405 }, 406 { 'z', &z_optname, 407 NUMBER, -1, &swindow, NULL, 408 { 409 "Scroll window size: ", 410 "Scroll window size is %d lines", 411 NULL 412 } 413 }, 414 { '"', "e_optname, 415 STRING, 0, NULL, opt_quote, 416 { "quotes: ", NULL, NULL } 417 }, 418 { '~', &tilde_optname, 419 BOOL|REPAINT, OPT_ON, &twiddle, NULL, 420 { 421 "Don't show tildes after end of file", 422 "Show tildes after end of file", 423 NULL 424 } 425 }, 426 { '?', &query_optname, 427 NOVAR, 0, NULL, opt_query, 428 { NULL, NULL, NULL } 429 }, 430 { '#', £_optname, 431 STRING, 0, NULL, opt_shift, 432 { 433 "Horizontal shift: ", 434 "0123456789.", 435 NULL 436 } 437 }, 438 { OLETTER_NONE, &keypad_optname, 439 BOOL|NO_TOGGLE, OPT_OFF, &no_keypad, NULL, 440 { 441 "Use keypad mode", 442 "Don't use keypad mode", 443 NULL 444 } 445 }, 446 { OLETTER_NONE, &oldbot_optname, 447 BOOL, OPT_OFF, &oldbot, NULL, 448 { 449 "Use new bottom of screen behavior", 450 "Use old bottom of screen behavior", 451 NULL 452 } 453 }, 454 { OLETTER_NONE, &follow_optname, 455 BOOL, FOLLOW_DESC, &follow_mode, NULL, 456 { 457 "F command follows file descriptor", 458 "F command follows file name", 459 NULL 460 } 461 }, 462 { OLETTER_NONE, &use_backslash_optname, 463 BOOL, OPT_OFF, &opt_use_backslash, NULL, 464 { 465 "Use backslash escaping in command line parameters", 466 "Don't use backslash escaping in command line parameters", 467 NULL 468 } 469 }, 470 { '\0', NULL, NOVAR, 0, NULL, NULL, { NULL, NULL, NULL } } 471}; 472 473 474/* 475 * Initialize each option to its default value. 476 */ 477 public void 478init_option() 479{ 480 register struct loption *o; 481 char *p; 482 483 p = lgetenv("LESS_IS_MORE"); 484 if (p != NULL && *p != '\0') 485 less_is_more = 1; 486 487 for (o = option; o->oletter != '\0'; o++) 488 { 489 /* 490 * Set each variable to its default. 491 */ 492 if (o->ovar != NULL) 493 *(o->ovar) = o->odefault; 494 if (o->otype & INIT_HANDLER) 495 (*(o->ofunc))(INIT, (char *) NULL); 496 } 497} 498 499/* 500 * Find an option in the option table, given its option letter. 501 */ 502 public struct loption * 503findopt(c) 504 int c; 505{ 506 register struct loption *o; 507 508 for (o = option; o->oletter != '\0'; o++) 509 { 510 if (o->oletter == c) 511 return (o); 512 if ((o->otype & TRIPLE) && ASCII_TO_UPPER(o->oletter) == c) 513 return (o); 514 } 515 return (NULL); 516} 517 518/* 519 * 520 */ 521 static int 522is_optchar(c) 523 char c; 524{ 525 if (ASCII_IS_UPPER(c)) 526 return 1; 527 if (ASCII_IS_LOWER(c)) 528 return 1; 529 if (c == '-') 530 return 1; 531 return 0; 532} 533 534/* 535 * Find an option in the option table, given its option name. 536 * p_optname is the (possibly partial) name to look for, and 537 * is updated to point after the matched name. 538 * p_oname if non-NULL is set to point to the full option name. 539 */ 540 public struct loption * 541findopt_name(p_optname, p_oname, p_err) 542 char **p_optname; 543 char **p_oname; 544 int *p_err; 545{ 546 char *optname = *p_optname; 547 register struct loption *o; 548 register struct optname *oname; 549 register int len; 550 int uppercase; 551 struct loption *maxo = NULL; 552 struct optname *maxoname = NULL; 553 int maxlen = 0; 554 int ambig = 0; 555 int exact = 0; 556 557 /* 558 * Check all options. 559 */ 560 for (o = option; o->oletter != '\0'; o++) 561 { 562 /* 563 * Check all names for this option. 564 */ 565 for (oname = o->onames; oname != NULL; oname = oname->onext) 566 { 567 /* 568 * Try normal match first (uppercase == 0), 569 * then, then if it's a TRIPLE option, 570 * try uppercase match (uppercase == 1). 571 */ 572 for (uppercase = 0; uppercase <= 1; uppercase++) 573 { 574 len = sprefix(optname, oname->oname, uppercase); 575 if (len <= 0 || is_optchar(optname[len])) 576 { 577 /* 578 * We didn't use all of the option name. 579 */ 580 continue; 581 } 582 if (!exact && len == maxlen) 583 /* 584 * Already had a partial match, 585 * and now there's another one that 586 * matches the same length. 587 */ 588 ambig = 1; 589 else if (len > maxlen) 590 { 591 /* 592 * Found a better match than 593 * the one we had. 594 */ 595 maxo = o; 596 maxoname = oname; 597 maxlen = len; 598 ambig = 0; 599 exact = (len == (int)strlen(oname->oname)); 600 } 601 if (!(o->otype & TRIPLE)) 602 break; 603 } 604 } 605 } 606 if (ambig) 607 { 608 /* 609 * Name matched more than one option. 610 */ 611 if (p_err != NULL) 612 *p_err = OPT_AMBIG; 613 return (NULL); 614 } 615 *p_optname = optname + maxlen; 616 if (p_oname != NULL) 617 *p_oname = maxoname == NULL ? NULL : maxoname->oname; 618 return (maxo); 619} 620