1 /* 2 * Copyright (C) 1984-2024 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, see the README file. 8 */ 9 10 11 /* 12 * The option table. 13 */ 14 15 #include "less.h" 16 #include "option.h" 17 18 /* 19 * Variables controlled by command line options. 20 */ 21 public int quiet; /* Should we suppress the audible bell? */ 22 public int no_vbell; /* Should we suppress the visual 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 shift_count; /* Number of positions to shift horizontally */ 45 public long shift_count_fraction = -1; 46 public int chopline; /* Truncate displayed lines at screen width */ 47 public int wordwrap; /* Wrap lines at space */ 48 public int no_init; /* Disable sending ti/te termcap strings */ 49 public int no_keypad; /* Disable sending ks/ke termcap strings */ 50 public int twiddle; /* Show tildes after EOF */ 51 public int show_attn; /* Hilite first unread line */ 52 public int status_col; /* Display a status column */ 53 public int use_lessopen; /* Use the LESSOPEN filter */ 54 public int quit_on_intr; /* Quit on interrupt */ 55 public int follow_mode; /* F cmd Follows file desc or file name? */ 56 public int oldbot; /* Old bottom of screen behavior {{REMOVE}} */ 57 public int opt_use_backslash; /* Use backslash escaping in option parsing */ 58 public LWCHAR rscroll_char; /* Char which marks chopped lines with -S */ 59 public int rscroll_attr; /* Attribute of rscroll_char */ 60 public int no_hist_dups; /* Remove dups from history list */ 61 public int mousecap; /* Allow mouse for scrolling */ 62 public int wheel_lines; /* Number of lines to scroll on mouse wheel scroll */ 63 public int perma_marks; /* Save marks in history file */ 64 public int linenum_width; /* Width of line numbers */ 65 public int status_col_width; /* Width of status column */ 66 public int incr_search; /* Incremental search */ 67 public int use_color; /* Use UI color */ 68 public int want_filesize; /* Scan to EOF if necessary to get file size */ 69 public int status_line; /* Highlight entire marked lines */ 70 public int header_lines; /* Freeze header lines at top of screen */ 71 public int header_cols; /* Freeze header columns at left of screen */ 72 public int nonum_headers; /* Don't give headers line numbers */ 73 public int nosearch_header_lines = 0; /* Don't search in header lines */ 74 public int nosearch_header_cols = 0; /* Don't search in header columns */ 75 public int redraw_on_quit; /* Redraw last screen after term deinit */ 76 public int def_search_type; /* */ 77 public int exit_F_on_close; /* Exit F command when input closes */ 78 public int modelines; /* Lines to read looking for modelines */ 79 public int show_preproc_error; /* Display msg when preproc exits with error */ 80 public int proc_backspace; /* Special handling of backspace */ 81 public int proc_tab; /* Special handling of tab */ 82 public int proc_return; /* Special handling of carriage return */ 83 public int match_shift; /* Extra horizontal shift on search match */ 84 public long match_shift_fraction = NUM_FRAC_DENOM/2; /* 1/2 of screen width */ 85 public char intr_char = CONTROL('X'); /* Char to interrupt reads */ 86 #if HILITE_SEARCH 87 public int hilite_search; /* Highlight matched search patterns? */ 88 #endif 89 90 public int less_is_more = 0; /* Make compatible with POSIX more */ 91 92 /* 93 * Long option names. 94 */ 95 static struct optname a_optname = { "search-skip-screen", NULL }; 96 static struct optname b_optname = { "buffers", NULL }; 97 static struct optname B__optname = { "auto-buffers", NULL }; 98 static struct optname c_optname = { "clear-screen", NULL }; 99 static struct optname d_optname = { "dumb", NULL }; 100 static struct optname D__optname = { "color", NULL }; 101 static struct optname e_optname = { "quit-at-eof", NULL }; 102 static struct optname f_optname = { "force", NULL }; 103 static struct optname F__optname = { "quit-if-one-screen", NULL }; 104 #if HILITE_SEARCH 105 static struct optname g_optname = { "hilite-search", NULL }; 106 #endif 107 static struct optname h_optname = { "max-back-scroll", NULL }; 108 static struct optname i_optname = { "ignore-case", NULL }; 109 static struct optname j_optname = { "jump-target", NULL }; 110 static struct optname J__optname = { "status-column", NULL }; 111 #if USERFILE 112 static struct optname k_optname = { "lesskey-file", NULL }; 113 #if HAVE_LESSKEYSRC 114 static struct optname ks_optname = { "lesskey-src", NULL }; 115 static struct optname kc_optname = { "lesskey-content", NULL }; 116 #endif /* HAVE_LESSKEYSRC */ 117 #endif 118 static struct optname K__optname = { "quit-on-intr", NULL }; 119 static struct optname L__optname = { "no-lessopen", NULL }; 120 static struct optname m_optname = { "long-prompt", NULL }; 121 static struct optname n_optname = { "line-numbers", NULL }; 122 #if LOGFILE 123 static struct optname o_optname = { "log-file", NULL }; 124 static struct optname O__optname = { "LOG-FILE", NULL }; 125 #endif 126 static struct optname p_optname = { "pattern", NULL }; 127 static struct optname P__optname = { "prompt", NULL }; 128 static struct optname q2_optname = { "silent", NULL }; 129 static struct optname q_optname = { "quiet", &q2_optname }; 130 static struct optname r_optname = { "raw-control-chars", NULL }; 131 static struct optname s_optname = { "squeeze-blank-lines", NULL }; 132 static struct optname S__optname = { "chop-long-lines", NULL }; 133 #if TAGS 134 static struct optname t_optname = { "tag", NULL }; 135 static struct optname T__optname = { "tag-file", NULL }; 136 #endif 137 static struct optname u_optname = { "underline-special", NULL }; 138 static struct optname V__optname = { "version", NULL }; 139 static struct optname w_optname = { "hilite-unread", NULL }; 140 static struct optname x_optname = { "tabs", NULL }; 141 static struct optname X__optname = { "no-init", NULL }; 142 static struct optname y_optname = { "max-forw-scroll", NULL }; 143 static struct optname z_optname = { "window", NULL }; 144 static struct optname quote_optname = { "quotes", NULL }; 145 static struct optname tilde_optname = { "tilde", NULL }; 146 static struct optname query_optname = { "help", NULL }; 147 static struct optname pound_optname = { "shift", NULL }; 148 static struct optname keypad_optname = { "no-keypad", NULL }; 149 static struct optname oldbot_optname = { "old-bot", NULL }; 150 static struct optname follow_optname = { "follow-name", NULL }; 151 static struct optname use_backslash_optname = { "use-backslash", NULL }; 152 static struct optname rscroll_optname = { "rscroll", NULL }; 153 static struct optname nohistdups_optname = { "no-histdups", NULL }; 154 static struct optname mousecap_optname = { "mouse", NULL }; 155 static struct optname wheel_lines_optname = { "wheel-lines", NULL }; 156 static struct optname perma_marks_optname = { "save-marks", NULL }; 157 static struct optname linenum_width_optname = { "line-num-width", NULL }; 158 static struct optname status_col_width_optname = { "status-col-width", NULL }; 159 static struct optname incr_search_optname = { "incsearch", NULL }; 160 static struct optname use_color_optname = { "use-color", NULL }; 161 static struct optname want_filesize_optname = { "file-size", NULL }; 162 static struct optname status_line_optname = { "status-line", NULL }; 163 static struct optname header_optname = { "header", NULL }; 164 static struct optname nonum_headers_optname = { "no-number-headers", NULL }; 165 static struct optname nosearch_headers_optname = { "no-search-headers", NULL }; 166 static struct optname nosearch_header_lines_optname = { "no-search-header-lines", NULL }; 167 static struct optname nosearch_header_cols_optname = { "no-search-header-columns", NULL }; 168 static struct optname redraw_on_quit_optname = { "redraw-on-quit", NULL }; 169 static struct optname search_type_optname = { "search-options", NULL }; 170 static struct optname exit_F_on_close_optname = { "exit-follow-on-close", NULL }; 171 static struct optname modelines_optname = { "modelines", NULL }; 172 static struct optname no_vbell_optname = { "no-vbell", NULL }; 173 static struct optname intr_optname = { "intr", NULL }; 174 static struct optname wordwrap_optname = { "wordwrap", NULL }; 175 static struct optname show_preproc_error_optname = { "show-preproc-errors", NULL }; 176 static struct optname proc_backspace_optname = { "proc-backspace", NULL }; 177 static struct optname proc_tab_optname = { "proc-tab", NULL }; 178 static struct optname proc_return_optname = { "proc-return", NULL }; 179 static struct optname match_shift_optname = { "match-shift", NULL }; 180 #if LESSTEST 181 static struct optname ttyin_name_optname = { "tty", NULL }; 182 #endif /*LESSTEST*/ 183 184 185 /* 186 * Table of all options and their semantics. 187 * 188 * For BOOL and TRIPLE options, odesc[0], odesc[1], odesc[2] are 189 * the description of the option when set to 0, 1 or 2, respectively. 190 * For NUMBER options, odesc[0] is the prompt to use when entering 191 * a new value, and odesc[1] is the description, which should contain 192 * one %d which is replaced by the value of the number. 193 * For STRING options, odesc[0] is the prompt to use when entering 194 * a new value, and odesc[1], if not NULL, is the set of characters 195 * that are valid in the string. 196 */ 197 static struct loption option[] = 198 { 199 { 'a', &a_optname, 200 TRIPLE, OPT_ONPLUS, &how_search, NULL, 201 { 202 "Search includes displayed screen", 203 "Search skips displayed screen", 204 "Search includes all of displayed screen" 205 } 206 }, 207 208 { 'b', &b_optname, 209 NUMBER|INIT_HANDLER, 64, &bufspace, opt_b, 210 { 211 "Max buffer space per file (K): ", 212 "Max buffer space per file: %dK", 213 NULL 214 } 215 }, 216 { 'B', &B__optname, 217 BOOL, OPT_ON, &autobuf, NULL, 218 { 219 "Don't automatically allocate buffers", 220 "Automatically allocate buffers when needed", 221 NULL 222 } 223 }, 224 { 'c', &c_optname, 225 TRIPLE, OPT_OFF, &top_scroll, NULL, 226 { 227 "Repaint by scrolling from bottom of screen", 228 "Repaint by painting from top of screen", 229 "Repaint by painting from top of screen" 230 } 231 }, 232 { 'd', &d_optname, 233 BOOL|NO_TOGGLE, OPT_OFF, &know_dumb, NULL, 234 { 235 "Assume intelligent terminal", 236 "Assume dumb terminal", 237 NULL 238 } 239 }, 240 { 'D', &D__optname, 241 STRING|REPAINT|NO_QUERY, 0, NULL, opt_D, 242 { "color desc: ", "s", NULL } 243 }, 244 { 'e', &e_optname, 245 TRIPLE, OPT_OFF, &quit_at_eof, NULL, 246 { 247 "Don't quit at end-of-file", 248 "Quit at end-of-file", 249 "Quit immediately at end-of-file" 250 } 251 }, 252 { 'f', &f_optname, 253 BOOL, OPT_OFF, &force_open, NULL, 254 { 255 "Open only regular files", 256 "Open even non-regular files", 257 NULL 258 } 259 }, 260 { 'F', &F__optname, 261 BOOL, OPT_OFF, &quit_if_one_screen, NULL, 262 { 263 "Don't quit if end-of-file on first screen", 264 "Quit if end-of-file on first screen", 265 NULL 266 } 267 }, 268 #if HILITE_SEARCH 269 { 'g', &g_optname, 270 TRIPLE|HL_REPAINT, OPT_ONPLUS, &hilite_search, NULL, 271 { 272 "Don't highlight search matches", 273 "Highlight matches for previous search only", 274 "Highlight all matches for previous search pattern", 275 } 276 }, 277 #endif 278 { 'h', &h_optname, 279 NUMBER, -1, &back_scroll, NULL, 280 { 281 "Backwards scroll limit: ", 282 "Backwards scroll limit is %d lines", 283 NULL 284 } 285 }, 286 { 'i', &i_optname, 287 TRIPLE|HL_REPAINT, OPT_OFF, &caseless, opt_i, 288 { 289 "Case is significant in searches", 290 "Ignore case in searches", 291 "Ignore case in searches and in patterns" 292 } 293 }, 294 { 'j', &j_optname, 295 STRING, 0, NULL, opt_j, 296 { 297 "Target line: ", 298 "-.d", 299 NULL 300 } 301 }, 302 { 'J', &J__optname, 303 BOOL|REPAINT, OPT_OFF, &status_col, NULL, 304 { 305 "Don't display a status column", 306 "Display a status column", 307 NULL 308 } 309 }, 310 #if USERFILE 311 { 'k', &k_optname, 312 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_k, 313 { NULL, NULL, NULL } 314 }, 315 #if HAVE_LESSKEYSRC 316 { OLETTER_NONE, &kc_optname, 317 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_kc, 318 { NULL, NULL, NULL } 319 }, 320 { OLETTER_NONE, &ks_optname, 321 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_ks, 322 { NULL, NULL, NULL } 323 }, 324 #endif /* HAVE_LESSKEYSRC */ 325 #endif 326 { 'K', &K__optname, 327 BOOL, OPT_OFF, &quit_on_intr, NULL, 328 { 329 "Interrupt (ctrl-C) returns to prompt", 330 "Interrupt (ctrl-C) exits less", 331 NULL 332 } 333 }, 334 { 'L', &L__optname, 335 BOOL, OPT_ON, &use_lessopen, NULL, 336 { 337 "Don't use the LESSOPEN filter", 338 "Use the LESSOPEN filter", 339 NULL 340 } 341 }, 342 { 'm', &m_optname, 343 TRIPLE, OPT_OFF, &pr_type, NULL, 344 { 345 "Short prompt", 346 "Medium prompt", 347 "Long prompt" 348 } 349 }, 350 { 'n', &n_optname, 351 TRIPLE|REPAINT, OPT_ON, &linenums, NULL, 352 { 353 "Don't use line numbers", 354 "Use line numbers", 355 "Constantly display line numbers" 356 } 357 }, 358 #if LOGFILE 359 { 'o', &o_optname, 360 STRING, 0, NULL, opt_o, 361 { "log file: ", NULL, NULL } 362 }, 363 { 'O', &O__optname, 364 STRING, 0, NULL, opt__O, 365 { "Log file: ", NULL, NULL } 366 }, 367 #endif 368 { 'p', &p_optname, 369 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_p, 370 { NULL, NULL, NULL } 371 }, 372 { 'P', &P__optname, 373 STRING, 0, NULL, opt__P, 374 { "prompt: ", NULL, NULL } 375 }, 376 { 'q', &q_optname, 377 TRIPLE, OPT_OFF, &quiet, NULL, 378 { 379 "Ring the bell for errors AND at eof/bof", 380 "Ring the bell for errors but not at eof/bof", 381 "Never ring the bell" 382 } 383 }, 384 { 'r', &r_optname, 385 TRIPLE|REPAINT, OPT_OFF, &ctldisp, NULL, 386 { 387 "Display control characters as ^X", 388 "Display control characters directly (not recommended)", 389 "Display ANSI sequences directly, other control characters as ^X" 390 } 391 }, 392 { 's', &s_optname, 393 BOOL|REPAINT, OPT_OFF, &squeeze, NULL, 394 { 395 "Display all blank lines", 396 "Squeeze multiple blank lines", 397 NULL 398 } 399 }, 400 { 'S', &S__optname, 401 BOOL|REPAINT, OPT_OFF, &chopline, opt__S, 402 { 403 "Fold long lines", 404 "Chop long lines", 405 NULL 406 } 407 }, 408 #if TAGS 409 { 't', &t_optname, 410 STRING|NO_QUERY, 0, NULL, opt_t, 411 { "tag: ", NULL, NULL } 412 }, 413 { 'T', &T__optname, 414 STRING, 0, NULL, opt__T, 415 { "tags file: ", NULL, NULL } 416 }, 417 #endif 418 { 'u', &u_optname, 419 TRIPLE|REPAINT|HL_REPAINT, OPT_OFF, &bs_mode, NULL, 420 { 421 "Display underlined text in underline mode", 422 "Backspaces cause overstrike", 423 "Print backspace as ^H" 424 } 425 }, 426 { 'V', &V__optname, 427 NOVAR, 0, NULL, opt__V, 428 { NULL, NULL, NULL } 429 }, 430 { 'w', &w_optname, 431 TRIPLE|REPAINT, OPT_OFF, &show_attn, NULL, 432 { 433 "Don't highlight first unread line", 434 "Highlight first unread line after forward-screen", 435 "Highlight first unread line after any forward movement", 436 } 437 }, 438 { 'x', &x_optname, 439 STRING|REPAINT, 0, NULL, opt_x, 440 { 441 "Tab stops: ", 442 "d,", 443 NULL 444 } 445 }, 446 { 'X', &X__optname, 447 BOOL|NO_TOGGLE, OPT_OFF, &no_init, NULL, 448 { 449 "Send init/deinit strings to terminal", 450 "Don't use init/deinit strings", 451 NULL 452 } 453 }, 454 { 'y', &y_optname, 455 NUMBER, -1, &forw_scroll, NULL, 456 { 457 "Forward scroll limit: ", 458 "Forward scroll limit is %d lines", 459 NULL 460 } 461 }, 462 { 'z', &z_optname, 463 NUMBER, -1, &swindow, NULL, 464 { 465 "Scroll window size: ", 466 "Scroll window size is %d lines", 467 NULL 468 } 469 }, 470 { '"', "e_optname, 471 STRING, 0, NULL, opt_quote, 472 { "quotes: ", "s", NULL } 473 }, 474 { '~', &tilde_optname, 475 BOOL|REPAINT, OPT_ON, &twiddle, NULL, 476 { 477 "Don't show tildes after end of file", 478 "Show tildes after end of file", 479 NULL 480 } 481 }, 482 { '?', &query_optname, 483 NOVAR, 0, NULL, opt_query, 484 { NULL, NULL, NULL } 485 }, 486 { '#', £_optname, 487 STRING, 0, NULL, opt_shift, 488 { 489 "Horizontal shift: ", 490 ".d", 491 NULL 492 } 493 }, 494 { OLETTER_NONE, &keypad_optname, 495 BOOL|NO_TOGGLE, OPT_OFF, &no_keypad, NULL, 496 { 497 "Use keypad mode", 498 "Don't use keypad mode", 499 NULL 500 } 501 }, 502 { OLETTER_NONE, &oldbot_optname, 503 BOOL, OPT_OFF, &oldbot, NULL, 504 { 505 "Use new bottom of screen behavior", 506 "Use old bottom of screen behavior", 507 NULL 508 } 509 }, 510 { OLETTER_NONE, &follow_optname, 511 BOOL, FOLLOW_DESC, &follow_mode, NULL, 512 { 513 "F command follows file descriptor", 514 "F command follows file name", 515 NULL 516 } 517 }, 518 { OLETTER_NONE, &use_backslash_optname, 519 BOOL, OPT_OFF, &opt_use_backslash, NULL, 520 { 521 "Use backslash escaping in command line parameters", 522 "Don't use backslash escaping in command line parameters", 523 NULL 524 } 525 }, 526 { OLETTER_NONE, &rscroll_optname, 527 STRING|REPAINT|INIT_HANDLER, 0, NULL, opt_rscroll, 528 { "rscroll character: ", "s", NULL } 529 }, 530 { OLETTER_NONE, &nohistdups_optname, 531 BOOL, OPT_OFF, &no_hist_dups, NULL, 532 { 533 "Allow duplicates in history list", 534 "Remove duplicates from history list", 535 NULL 536 } 537 }, 538 { OLETTER_NONE, &mousecap_optname, 539 TRIPLE, OPT_OFF, &mousecap, opt_mousecap, 540 { 541 "Ignore mouse input", 542 "Use the mouse for scrolling", 543 "Use the mouse for scrolling (reverse)" 544 } 545 }, 546 { OLETTER_NONE, &wheel_lines_optname, 547 NUMBER|INIT_HANDLER, 0, &wheel_lines, opt_wheel_lines, 548 { 549 "Lines to scroll on mouse wheel: ", 550 "Scroll %d line(s) on mouse wheel", 551 NULL 552 } 553 }, 554 { OLETTER_NONE, &perma_marks_optname, 555 BOOL, OPT_OFF, &perma_marks, NULL, 556 { 557 "Don't save marks in history file", 558 "Save marks in history file", 559 NULL 560 } 561 }, 562 { OLETTER_NONE, &linenum_width_optname, 563 NUMBER|REPAINT, MIN_LINENUM_WIDTH, &linenum_width, opt_linenum_width, 564 { 565 "Line number width: ", 566 "Line number width is %d chars", 567 NULL 568 } 569 }, 570 { OLETTER_NONE, &status_col_width_optname, 571 NUMBER|REPAINT, 2, &status_col_width, opt_status_col_width, 572 { 573 "Status column width: ", 574 "Status column width is %d chars", 575 NULL 576 } 577 }, 578 { OLETTER_NONE, &incr_search_optname, 579 BOOL, OPT_OFF, &incr_search, NULL, 580 { 581 "Incremental search is off", 582 "Incremental search is on", 583 NULL 584 } 585 }, 586 { OLETTER_NONE, &use_color_optname, 587 BOOL|REPAINT, OPT_OFF, &use_color, NULL, 588 { 589 "Don't use color", 590 "Use color", 591 NULL 592 } 593 }, 594 { OLETTER_NONE, &want_filesize_optname, 595 BOOL|REPAINT, OPT_OFF, &want_filesize, opt_filesize, 596 { 597 "Don't get size of each file", 598 "Get size of each file", 599 NULL 600 } 601 }, 602 { OLETTER_NONE, &status_line_optname, 603 BOOL|REPAINT, OPT_OFF, &status_line, NULL, 604 { 605 "Don't color each line with its status column color", 606 "Color each line with its status column color", 607 NULL 608 } 609 }, 610 { OLETTER_NONE, &header_optname, 611 STRING|REPAINT, 0, NULL, opt_header, 612 { "Header lines: ", "d,", NULL } 613 }, 614 { OLETTER_NONE, &nonum_headers_optname, 615 BOOL|REPAINT, 0, &nonum_headers, NULL, 616 { 617 "Number header lines", 618 "Don't number header lines", 619 NULL 620 } 621 }, 622 { OLETTER_NONE, &nosearch_headers_optname, 623 BOOL|HL_REPAINT, 0, NULL, opt_nosearch_headers, 624 { 625 NULL, NULL, NULL 626 } 627 }, 628 { OLETTER_NONE, &nosearch_header_lines_optname, 629 BOOL|HL_REPAINT, 0, NULL, opt_nosearch_header_lines, 630 { 631 NULL, NULL, NULL 632 } 633 }, 634 { OLETTER_NONE, &nosearch_header_cols_optname, 635 BOOL|HL_REPAINT, 0, NULL, opt_nosearch_header_cols, 636 { 637 NULL, NULL, NULL 638 } 639 }, 640 { OLETTER_NONE, &redraw_on_quit_optname, 641 BOOL, OPT_OFF, &redraw_on_quit, NULL, 642 { 643 "Don't redraw screen when quitting", 644 "Redraw last screen when quitting", 645 NULL 646 } 647 }, 648 { OLETTER_NONE, &search_type_optname, 649 STRING, 0, NULL, opt_search_type, 650 { "Search options: ", "s", NULL } 651 }, 652 { OLETTER_NONE, &exit_F_on_close_optname, 653 BOOL, OPT_OFF, &exit_F_on_close, NULL, 654 { 655 "Don't exit F command when input closes", 656 "Exit F command when input closes", 657 NULL 658 } 659 }, 660 { OLETTER_NONE, &no_vbell_optname, 661 BOOL, OPT_OFF, &no_vbell, NULL, 662 { 663 "Display visual bell", 664 "Don't display visual bell", 665 NULL 666 } 667 }, 668 { OLETTER_NONE, &modelines_optname, 669 NUMBER, 0, &modelines, NULL, 670 { 671 "Lines to read looking for modelines: ", 672 "Read %d lines looking for modelines", 673 NULL 674 } 675 }, 676 { OLETTER_NONE, &intr_optname, 677 STRING, 0, NULL, opt_intr, 678 { "interrupt character: ", "s", NULL } 679 }, 680 { OLETTER_NONE, &wordwrap_optname, 681 BOOL|REPAINT, OPT_OFF, &wordwrap, NULL, 682 { 683 "Wrap lines at any character", 684 "Wrap lines at spaces", 685 NULL 686 } 687 }, 688 { OLETTER_NONE, &show_preproc_error_optname, 689 BOOL, OPT_OFF, &show_preproc_error, NULL, 690 { 691 "Don't show error message if preprocessor fails", 692 "Show error message if preprocessor fails", 693 NULL 694 } 695 }, 696 { OLETTER_NONE, &proc_backspace_optname, 697 TRIPLE|REPAINT|HL_REPAINT, OPT_OFF, &proc_backspace, NULL, 698 { 699 "Backspace handling is specified by the -U option", 700 "Display underline text in underline mode", 701 "Print backspaces as ^H" 702 } 703 }, 704 { OLETTER_NONE, &proc_tab_optname, 705 TRIPLE|REPAINT|HL_REPAINT, OPT_OFF, &proc_tab, NULL, 706 { 707 "Tab handling is specified by the -U option", 708 "Expand tabs to spaces", 709 "Print tabs as ^I" 710 } 711 }, 712 { OLETTER_NONE, &proc_return_optname, 713 TRIPLE|REPAINT|HL_REPAINT, OPT_OFF, &proc_return, NULL, 714 { 715 "Carriage return handling is specified by the -U option", 716 "Delete carriage return before newline", 717 "Print carriage return as ^M" 718 } 719 }, 720 { OLETTER_NONE, &match_shift_optname, 721 STRING|INIT_HANDLER, 0, NULL, opt_match_shift, 722 { 723 "Search match shift: ", 724 ".d", 725 NULL 726 } 727 }, 728 #if LESSTEST 729 { OLETTER_NONE, &ttyin_name_optname, 730 STRING|NO_TOGGLE, 0, NULL, opt_ttyin_name, 731 { 732 NULL, 733 NULL, 734 NULL 735 } 736 }, 737 #endif /*LESSTEST*/ 738 { '\0', NULL, NOVAR, 0, NULL, NULL, { NULL, NULL, NULL } } 739 }; 740 741 742 /* 743 * Initialize each option to its default value. 744 */ 745 public void init_option(void) 746 { 747 struct loption *o; 748 constant char *p; 749 750 p = lgetenv("LESS_IS_MORE"); 751 if (!isnullenv(p)) 752 less_is_more = 1; 753 754 for (o = option; o->oletter != '\0'; o++) 755 { 756 /* 757 * Set each variable to its default. 758 */ 759 if (o->ovar != NULL) 760 *(o->ovar) = o->odefault; 761 if (o->otype & INIT_HANDLER) 762 (*(o->ofunc))(INIT, (char *) NULL); 763 } 764 } 765 766 /* 767 * Find an option in the option table, given its option letter. 768 */ 769 public struct loption * findopt(int c) 770 { 771 struct loption *o; 772 773 for (o = option; o->oletter != '\0'; o++) 774 { 775 if (o->oletter == c) 776 return (o); 777 if ((o->otype & TRIPLE) && ASCII_TO_UPPER(o->oletter) == c) 778 return (o); 779 } 780 return (NULL); 781 } 782 783 /* 784 * 785 */ 786 static lbool is_optchar(char c) 787 { 788 if (ASCII_IS_UPPER(c)) 789 return TRUE; 790 if (ASCII_IS_LOWER(c)) 791 return TRUE; 792 if (c == '-') 793 return TRUE; 794 return FALSE; 795 } 796 797 /* 798 * Find an option in the option table, given its option name. 799 * p_optname is the (possibly partial) name to look for, and 800 * is updated to point after the matched name. 801 * p_oname if non-NULL is set to point to the full option name. 802 */ 803 public struct loption * findopt_name(constant char **p_optname, constant char **p_oname, lbool *p_ambig) 804 { 805 constant char *optname = *p_optname; 806 struct loption *o; 807 struct optname *oname; 808 size_t len; 809 int uppercase; 810 struct loption *maxo = NULL; 811 struct optname *maxoname = NULL; 812 size_t maxlen = 0; 813 lbool ambig = FALSE; 814 lbool exact = FALSE; 815 816 /* 817 * Check all options. 818 */ 819 for (o = option; o->oletter != '\0'; o++) 820 { 821 /* 822 * Check all names for this option. 823 */ 824 for (oname = o->onames; oname != NULL; oname = oname->onext) 825 { 826 /* 827 * Try normal match first (uppercase == 0), 828 * then, then if it's a TRIPLE option, 829 * try uppercase match (uppercase == 1). 830 */ 831 for (uppercase = 0; uppercase <= 1; uppercase++) 832 { 833 len = sprefix(optname, oname->oname, uppercase); 834 if (len == 0 || is_optchar(optname[len])) 835 { 836 /* 837 * We didn't use all of the option name. 838 */ 839 continue; 840 } 841 if (!exact && len == maxlen) 842 /* 843 * Already had a partial match, 844 * and now there's another one that 845 * matches the same length. 846 */ 847 ambig = TRUE; 848 else if (len > maxlen) 849 { 850 /* 851 * Found a better match than 852 * the one we had. 853 */ 854 maxo = o; 855 maxoname = oname; 856 maxlen = len; 857 ambig = FALSE; 858 exact = (len == strlen(oname->oname)); 859 } 860 if (!(o->otype & TRIPLE)) 861 break; 862 } 863 } 864 } 865 if (p_ambig != NULL) 866 *p_ambig = ambig; 867 if (ambig) 868 { 869 /* 870 * Name matched more than one option. 871 */ 872 return (NULL); 873 } 874 *p_optname = optname + maxlen; 875 if (p_oname != NULL) 876 *p_oname = maxoname == NULL ? NULL : maxoname->oname; 877 return (maxo); 878 } 879