1 /* 2 * Copyright (C) 1984-2025 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 int no_paste; /* Don't accept pasted input */ 85 public int no_edit_warn; /* Don't warn when editing a LESSOPENed file */ 86 public int stop_on_form_feed; /* Stop scrolling on a line starting with form feed */ 87 public long match_shift_fraction = NUM_FRAC_DENOM/2; /* 1/2 of screen width */ 88 public char intr_char = CONTROL('X'); /* Char to interrupt reads */ 89 public char *first_cmd_at_prompt = NULL; /* Command to exec before first prompt */ 90 #if HILITE_SEARCH 91 public int hilite_search; /* Highlight matched search patterns? */ 92 #endif 93 94 public int less_is_more = 0; /* Make compatible with POSIX more */ 95 96 /* 97 * Long option names. 98 */ 99 static struct optname a_optname = { "search-skip-screen", NULL }; 100 static struct optname b_optname = { "buffers", NULL }; 101 static struct optname B__optname = { "auto-buffers", NULL }; 102 static struct optname c_optname = { "clear-screen", NULL }; 103 static struct optname d_optname = { "dumb", NULL }; 104 static struct optname D__optname = { "color", NULL }; 105 static struct optname e_optname = { "quit-at-eof", NULL }; 106 static struct optname f_optname = { "force", NULL }; 107 static struct optname F__optname = { "quit-if-one-screen", NULL }; 108 #if HILITE_SEARCH 109 static struct optname g_optname = { "hilite-search", NULL }; 110 #endif 111 static struct optname h_optname = { "max-back-scroll", NULL }; 112 static struct optname i_optname = { "ignore-case", NULL }; 113 static struct optname j_optname = { "jump-target", NULL }; 114 static struct optname J__optname = { "status-column", NULL }; 115 #if USERFILE 116 static struct optname k_optname = { "lesskey-file", NULL }; 117 #if HAVE_LESSKEYSRC 118 static struct optname ks_optname = { "lesskey-src", NULL }; 119 static struct optname kc_optname = { "lesskey-content", NULL }; 120 #endif /* HAVE_LESSKEYSRC */ 121 #endif 122 static struct optname K__optname = { "quit-on-intr", NULL }; 123 static struct optname L__optname = { "no-lessopen", NULL }; 124 static struct optname m_optname = { "long-prompt", NULL }; 125 static struct optname n_optname = { "line-numbers", NULL }; 126 #if LOGFILE 127 static struct optname o_optname = { "log-file", NULL }; 128 static struct optname O__optname = { "LOG-FILE", NULL }; 129 #endif 130 static struct optname p_optname = { "pattern", NULL }; 131 static struct optname P__optname = { "prompt", NULL }; 132 static struct optname q2_optname = { "silent", NULL }; 133 static struct optname q_optname = { "quiet", &q2_optname }; 134 static struct optname r_optname = { "raw-control-chars", NULL }; 135 static struct optname s_optname = { "squeeze-blank-lines", NULL }; 136 static struct optname S__optname = { "chop-long-lines", NULL }; 137 #if TAGS 138 static struct optname t_optname = { "tag", NULL }; 139 static struct optname T__optname = { "tag-file", NULL }; 140 #endif 141 static struct optname u_optname = { "underline-special", NULL }; 142 static struct optname V__optname = { "version", NULL }; 143 static struct optname w_optname = { "hilite-unread", NULL }; 144 static struct optname x_optname = { "tabs", NULL }; 145 static struct optname X__optname = { "no-init", NULL }; 146 static struct optname y_optname = { "max-forw-scroll", NULL }; 147 static struct optname z_optname = { "window", NULL }; 148 static struct optname quote_optname = { "quotes", NULL }; 149 static struct optname tilde_optname = { "tilde", NULL }; 150 static struct optname query_optname = { "help", NULL }; 151 static struct optname pound_optname = { "shift", NULL }; 152 static struct optname keypad_optname = { "no-keypad", NULL }; 153 static struct optname oldbot_optname = { "old-bot", NULL }; 154 static struct optname follow_optname = { "follow-name", NULL }; 155 static struct optname use_backslash_optname = { "use-backslash", NULL }; 156 static struct optname rscroll_optname = { "rscroll", NULL }; 157 static struct optname nohistdups_optname = { "no-histdups", NULL }; 158 static struct optname mousecap_optname = { "mouse", NULL }; 159 static struct optname wheel_lines_optname = { "wheel-lines", NULL }; 160 static struct optname perma_marks_optname = { "save-marks", NULL }; 161 static struct optname linenum_width_optname = { "line-num-width", NULL }; 162 static struct optname status_col_width_optname = { "status-col-width", NULL }; 163 static struct optname incr_search_optname = { "incsearch", NULL }; 164 static struct optname use_color_optname = { "use-color", NULL }; 165 static struct optname want_filesize_optname = { "file-size", NULL }; 166 static struct optname status_line_optname = { "status-line", NULL }; 167 static struct optname header_optname = { "header", NULL }; 168 static struct optname no_paste_optname = { "no-paste", NULL }; 169 static struct optname form_feed_optname = { "form-feed", NULL }; 170 static struct optname no_edit_warn_optname2 = { "no-warn-edit", NULL }; 171 static struct optname no_edit_warn_optname = { "no-edit-warn", &no_edit_warn_optname2 }; 172 static struct optname nonum_headers_optname = { "no-number-headers", NULL }; 173 static struct optname nosearch_headers_optname = { "no-search-headers", NULL }; 174 static struct optname nosearch_header_lines_optname = { "no-search-header-lines", NULL }; 175 static struct optname nosearch_header_cols_optname = { "no-search-header-columns", NULL }; 176 static struct optname redraw_on_quit_optname = { "redraw-on-quit", NULL }; 177 static struct optname search_type_optname = { "search-options", NULL }; 178 static struct optname exit_F_on_close_optname = { "exit-follow-on-close", NULL }; 179 static struct optname modelines_optname = { "modelines", NULL }; 180 static struct optname no_vbell_optname = { "no-vbell", NULL }; 181 static struct optname intr_optname = { "intr", NULL }; 182 static struct optname wordwrap_optname = { "wordwrap", NULL }; 183 static struct optname show_preproc_error_optname = { "show-preproc-errors", NULL }; 184 static struct optname proc_backspace_optname = { "proc-backspace", NULL }; 185 static struct optname proc_tab_optname = { "proc-tab", NULL }; 186 static struct optname proc_return_optname = { "proc-return", NULL }; 187 static struct optname match_shift_optname = { "match-shift", NULL }; 188 static struct optname first_cmd_at_prompt_optname = { "cmd", NULL }; 189 #if LESSTEST 190 static struct optname ttyin_name_optname = { "tty", NULL }; 191 #endif /*LESSTEST*/ 192 193 194 /* 195 * Table of all options and their semantics. 196 * 197 * For BOOL and TRIPLE options, odesc[0], odesc[1], odesc[2] are 198 * the description of the option when set to 0, 1 or 2, respectively. 199 * For NUMBER options, odesc[0] is the prompt to use when entering 200 * a new value, and odesc[1] is the description, which should contain 201 * one %d which is replaced by the value of the number. 202 * For STRING options, odesc[0] is the prompt to use when entering 203 * a new value, and odesc[1], if not NULL, is the set of characters 204 * that are valid in the string. 205 */ 206 static struct loption option[] = 207 { 208 { 'a', &a_optname, 209 O_TRIPLE, OPT_ONPLUS, &how_search, NULL, 210 { 211 "Search includes displayed screen", 212 "Search skips displayed screen", 213 "Search includes all of displayed screen" 214 } 215 }, 216 217 { 'b', &b_optname, 218 O_NUMBER|O_INIT_HANDLER, 64, &bufspace, opt_b, 219 { 220 "Max buffer space per file (K): ", 221 "Max buffer space per file: %dK", 222 NULL 223 } 224 }, 225 { 'B', &B__optname, 226 O_BOOL, OPT_ON, &autobuf, NULL, 227 { 228 "Don't automatically allocate buffers", 229 "Automatically allocate buffers when needed", 230 NULL 231 } 232 }, 233 { 'c', &c_optname, 234 O_TRIPLE, OPT_OFF, &top_scroll, NULL, 235 { 236 "Repaint by scrolling from bottom of screen", 237 "Repaint by painting from top of screen", 238 "Repaint by painting from top of screen" 239 } 240 }, 241 { 'd', &d_optname, 242 O_BOOL|O_NO_TOGGLE, OPT_OFF, &know_dumb, NULL, 243 { 244 "Assume intelligent terminal", 245 "Assume dumb terminal", 246 NULL 247 } 248 }, 249 { 'D', &D__optname, 250 O_STRING|O_REPAINT|O_NO_QUERY, 0, NULL, opt_D, 251 { "color desc: ", "s", NULL } 252 }, 253 { 'e', &e_optname, 254 O_TRIPLE, OPT_OFF, &quit_at_eof, NULL, 255 { 256 "Don't quit at end-of-file", 257 "Quit at end-of-file", 258 "Quit immediately at end-of-file" 259 } 260 }, 261 { 'f', &f_optname, 262 O_BOOL, OPT_OFF, &force_open, NULL, 263 { 264 "Open only regular files", 265 "Open even non-regular files", 266 NULL 267 } 268 }, 269 { 'F', &F__optname, 270 O_BOOL, OPT_OFF, &quit_if_one_screen, NULL, 271 { 272 "Don't quit if end-of-file on first screen", 273 "Quit if end-of-file on first screen", 274 NULL 275 } 276 }, 277 #if HILITE_SEARCH 278 { 'g', &g_optname, 279 O_TRIPLE|O_HL_REPAINT, OPT_ONPLUS, &hilite_search, NULL, 280 { 281 "Don't highlight search matches", 282 "Highlight matches for previous search only", 283 "Highlight all matches for previous search pattern", 284 } 285 }, 286 #endif 287 { 'h', &h_optname, 288 O_NUMBER, -1, &back_scroll, NULL, 289 { 290 "Backwards scroll limit: ", 291 "Backwards scroll limit is %d lines", 292 NULL 293 } 294 }, 295 { 'i', &i_optname, 296 O_TRIPLE|O_HL_REPAINT, OPT_OFF, &caseless, opt_i, 297 { 298 "Case is significant in searches", 299 "Ignore case in searches", 300 "Ignore case in searches and in patterns" 301 } 302 }, 303 { 'j', &j_optname, 304 O_STRING, 0, NULL, opt_j, 305 { 306 "Target line: ", 307 "-.d", 308 NULL 309 } 310 }, 311 { 'J', &J__optname, 312 O_BOOL|O_REPAINT, OPT_OFF, &status_col, NULL, 313 { 314 "Don't display a status column", 315 "Display a status column", 316 NULL 317 } 318 }, 319 #if USERFILE 320 { 'k', &k_optname, 321 O_STRING|O_NO_TOGGLE|O_NO_QUERY, 0, NULL, opt_k, 322 { NULL, NULL, NULL } 323 }, 324 #if HAVE_LESSKEYSRC 325 { OLETTER_NONE, &kc_optname, 326 O_STRING|O_NO_TOGGLE|O_NO_QUERY, 0, NULL, opt_kc, 327 { NULL, NULL, NULL } 328 }, 329 { OLETTER_NONE, &ks_optname, 330 O_STRING|O_NO_TOGGLE|O_NO_QUERY, 0, NULL, opt_ks, 331 { NULL, NULL, NULL } 332 }, 333 #endif /* HAVE_LESSKEYSRC */ 334 #endif 335 { 'K', &K__optname, 336 O_BOOL, OPT_OFF, &quit_on_intr, NULL, 337 { 338 "Interrupt (ctrl-C) returns to prompt", 339 "Interrupt (ctrl-C) exits less", 340 NULL 341 } 342 }, 343 { 'L', &L__optname, 344 O_BOOL, OPT_ON, &use_lessopen, NULL, 345 { 346 "Don't use the LESSOPEN filter", 347 "Use the LESSOPEN filter", 348 NULL 349 } 350 }, 351 { 'm', &m_optname, 352 O_TRIPLE, OPT_OFF, &pr_type, NULL, 353 { 354 "Short prompt", 355 "Medium prompt", 356 "Long prompt" 357 } 358 }, 359 { 'n', &n_optname, 360 O_TRIPLE|O_REPAINT, OPT_ON, &linenums, NULL, 361 { 362 "Don't use line numbers", 363 "Use line numbers", 364 "Constantly display line numbers" 365 } 366 }, 367 #if LOGFILE 368 { 'o', &o_optname, 369 O_STRING, 0, NULL, opt_o, 370 { "log file: ", NULL, NULL } 371 }, 372 { 'O', &O__optname, 373 O_STRING, 0, NULL, opt__O, 374 { "Log file: ", NULL, NULL } 375 }, 376 #endif 377 { 'p', &p_optname, 378 O_STRING|O_NO_TOGGLE|O_NO_QUERY, 0, NULL, opt_p, 379 { NULL, NULL, NULL } 380 }, 381 { 'P', &P__optname, 382 O_STRING, 0, NULL, opt__P, 383 { "prompt: ", NULL, NULL } 384 }, 385 { 'q', &q_optname, 386 O_TRIPLE, OPT_OFF, &quiet, NULL, 387 { 388 "Ring the bell for errors AND at eof/bof", 389 "Ring the bell for errors but not at eof/bof", 390 "Never ring the bell" 391 } 392 }, 393 { 'r', &r_optname, 394 O_TRIPLE|O_REPAINT, OPT_OFF, &ctldisp, NULL, 395 { 396 "Display control characters as ^X", 397 "Display control characters directly (not recommended)", 398 "Display ANSI sequences directly, other control characters as ^X" 399 } 400 }, 401 { 's', &s_optname, 402 O_BOOL|O_REPAINT, OPT_OFF, &squeeze, NULL, 403 { 404 "Display all blank lines", 405 "Squeeze multiple blank lines", 406 NULL 407 } 408 }, 409 { 'S', &S__optname, 410 O_BOOL|O_REPAINT, OPT_OFF, &chopline, opt__S, 411 { 412 "Fold long lines", 413 "Chop long lines", 414 NULL 415 } 416 }, 417 #if TAGS 418 { 't', &t_optname, 419 O_STRING|O_NO_QUERY, 0, NULL, opt_t, 420 { "tag: ", NULL, NULL } 421 }, 422 { 'T', &T__optname, 423 O_STRING, 0, NULL, opt__T, 424 { "tags file: ", NULL, NULL } 425 }, 426 #endif 427 { 'u', &u_optname, 428 O_TRIPLE|O_REPAINT|O_HL_REPAINT, OPT_OFF, &bs_mode, NULL, 429 { 430 "Display underlined text in underline mode", 431 "Backspaces cause overstrike", 432 "Print backspace as ^H" 433 } 434 }, 435 { 'V', &V__optname, 436 O_NOVAR, 0, NULL, opt__V, 437 { NULL, NULL, NULL } 438 }, 439 { 'w', &w_optname, 440 O_TRIPLE|O_REPAINT, OPT_OFF, &show_attn, NULL, 441 { 442 "Don't highlight first unread line", 443 "Highlight first unread line after forward-screen", 444 "Highlight first unread line after any forward movement", 445 } 446 }, 447 { 'x', &x_optname, 448 O_STRING|O_REPAINT, 0, NULL, opt_x, 449 { 450 "Tab stops: ", 451 "d,", 452 NULL 453 } 454 }, 455 { 'X', &X__optname, 456 O_BOOL|O_NO_TOGGLE, OPT_OFF, &no_init, NULL, 457 { 458 "Send init/deinit strings to terminal", 459 "Don't use init/deinit strings", 460 NULL 461 } 462 }, 463 { 'y', &y_optname, 464 O_NUMBER, -1, &forw_scroll, NULL, 465 { 466 "Forward scroll limit: ", 467 "Forward scroll limit is %d lines", 468 NULL 469 } 470 }, 471 { 'z', &z_optname, 472 O_NUMBER, -1, &swindow, NULL, 473 { 474 "Scroll window size: ", 475 "Scroll window size is %d lines", 476 NULL 477 } 478 }, 479 { '"', "e_optname, 480 O_STRING, 0, NULL, opt_quote, 481 { "quotes: ", "s", NULL } 482 }, 483 { '~', &tilde_optname, 484 O_BOOL|O_REPAINT, OPT_ON, &twiddle, NULL, 485 { 486 "Don't show tildes after end of file", 487 "Show tildes after end of file", 488 NULL 489 } 490 }, 491 { '?', &query_optname, 492 O_NOVAR, 0, NULL, opt_query, 493 { NULL, NULL, NULL } 494 }, 495 { '#', £_optname, 496 O_STRING, 0, NULL, opt_shift, 497 { 498 "Horizontal shift: ", 499 ".d", 500 NULL 501 } 502 }, 503 { OLETTER_NONE, &keypad_optname, 504 O_BOOL|O_NO_TOGGLE, OPT_OFF, &no_keypad, NULL, 505 { 506 "Use keypad mode", 507 "Don't use keypad mode", 508 NULL 509 } 510 }, 511 { OLETTER_NONE, &oldbot_optname, 512 O_BOOL, OPT_OFF, &oldbot, NULL, 513 { 514 "Use new bottom of screen behavior", 515 "Use old bottom of screen behavior", 516 NULL 517 } 518 }, 519 { OLETTER_NONE, &follow_optname, 520 O_BOOL, FOLLOW_DESC, &follow_mode, NULL, 521 { 522 "F command follows file descriptor", 523 "F command follows file name", 524 NULL 525 } 526 }, 527 { OLETTER_NONE, &use_backslash_optname, 528 O_BOOL, OPT_OFF, &opt_use_backslash, NULL, 529 { 530 "Use backslash escaping in command line parameters", 531 "Don't use backslash escaping in command line parameters", 532 NULL 533 } 534 }, 535 { OLETTER_NONE, &rscroll_optname, 536 O_STRING|O_REPAINT|O_INIT_HANDLER, 0, NULL, opt_rscroll, 537 { "rscroll character: ", "s", NULL } 538 }, 539 { OLETTER_NONE, &nohistdups_optname, 540 O_BOOL, OPT_OFF, &no_hist_dups, NULL, 541 { 542 "Allow duplicates in history list", 543 "Remove duplicates from history list", 544 NULL 545 } 546 }, 547 { OLETTER_NONE, &mousecap_optname, 548 O_TRIPLE, OPT_OFF, &mousecap, opt_mousecap, 549 { 550 "Ignore mouse input", 551 "Use the mouse for scrolling", 552 "Use the mouse for scrolling (reverse)" 553 } 554 }, 555 { OLETTER_NONE, &wheel_lines_optname, 556 O_NUMBER|O_INIT_HANDLER, 0, &wheel_lines, opt_wheel_lines, 557 { 558 "Lines to scroll on mouse wheel: ", 559 "Scroll %d line(s) on mouse wheel", 560 NULL 561 } 562 }, 563 { OLETTER_NONE, &perma_marks_optname, 564 O_BOOL, OPT_OFF, &perma_marks, NULL, 565 { 566 "Don't save marks in history file", 567 "Save marks in history file", 568 NULL 569 } 570 }, 571 { OLETTER_NONE, &linenum_width_optname, 572 O_NUMBER|O_REPAINT, MIN_LINENUM_WIDTH, &linenum_width, opt_linenum_width, 573 { 574 "Line number width: ", 575 "Line number width is %d chars", 576 NULL 577 } 578 }, 579 { OLETTER_NONE, &status_col_width_optname, 580 O_NUMBER|O_REPAINT, 2, &status_col_width, opt_status_col_width, 581 { 582 "Status column width: ", 583 "Status column width is %d chars", 584 NULL 585 } 586 }, 587 { OLETTER_NONE, &incr_search_optname, 588 O_BOOL, OPT_OFF, &incr_search, NULL, 589 { 590 "Incremental search is off", 591 "Incremental search is on", 592 NULL 593 } 594 }, 595 { OLETTER_NONE, &use_color_optname, 596 O_BOOL|O_REPAINT, OPT_OFF, &use_color, NULL, 597 { 598 "Don't use color", 599 "Use color", 600 NULL 601 } 602 }, 603 { OLETTER_NONE, &want_filesize_optname, 604 O_BOOL|O_REPAINT, OPT_OFF, &want_filesize, opt_filesize, 605 { 606 "Don't get size of each file", 607 "Get size of each file", 608 NULL 609 } 610 }, 611 { OLETTER_NONE, &status_line_optname, 612 O_BOOL|O_REPAINT, OPT_OFF, &status_line, NULL, 613 { 614 "Don't color each line with its status column color", 615 "Color each line with its status column color", 616 NULL 617 } 618 }, 619 { OLETTER_NONE, &header_optname, 620 O_STRING|O_REPAINT, 0, NULL, opt_header, 621 { "Header lines: ", "d,", NULL } 622 }, 623 { OLETTER_NONE, &no_paste_optname, 624 O_BOOL, OPT_OFF, &no_paste, opt_no_paste, 625 { 626 "Accept pasted input", 627 "Ignore pasted input", 628 NULL 629 } 630 }, 631 { OLETTER_NONE, &form_feed_optname, 632 O_BOOL, OPT_OFF, &stop_on_form_feed, NULL, 633 { 634 "Don't stop on form feed", 635 "Stop on form feed", 636 NULL 637 } 638 }, 639 { OLETTER_NONE, &no_edit_warn_optname, 640 O_BOOL, OPT_OFF, &no_edit_warn, NULL, 641 { 642 "Warn when editing a file opened via LESSOPEN", 643 "Don't warn when editing a file opened via LESSOPEN", 644 NULL 645 } 646 }, 647 { OLETTER_NONE, &nonum_headers_optname, 648 O_BOOL|O_REPAINT, 0, &nonum_headers, NULL, 649 { 650 "Number header lines", 651 "Don't number header lines", 652 NULL 653 } 654 }, 655 { OLETTER_NONE, &nosearch_headers_optname, 656 O_BOOL|O_HL_REPAINT, 0, NULL, opt_nosearch_headers, 657 { 658 NULL, NULL, NULL 659 } 660 }, 661 { OLETTER_NONE, &nosearch_header_lines_optname, 662 O_BOOL|O_HL_REPAINT, 0, NULL, opt_nosearch_header_lines, 663 { 664 NULL, NULL, NULL 665 } 666 }, 667 { OLETTER_NONE, &nosearch_header_cols_optname, 668 O_BOOL|O_HL_REPAINT, 0, NULL, opt_nosearch_header_cols, 669 { 670 NULL, NULL, NULL 671 } 672 }, 673 { OLETTER_NONE, &redraw_on_quit_optname, 674 O_BOOL, OPT_OFF, &redraw_on_quit, NULL, 675 { 676 "Don't redraw screen when quitting", 677 "Redraw last screen when quitting", 678 NULL 679 } 680 }, 681 { OLETTER_NONE, &search_type_optname, 682 O_STRING, 0, NULL, opt_search_type, 683 { "Search options: ", "s", NULL } 684 }, 685 { OLETTER_NONE, &exit_F_on_close_optname, 686 O_BOOL, OPT_OFF, &exit_F_on_close, NULL, 687 { 688 "Don't exit F command when input closes", 689 "Exit F command when input closes", 690 NULL 691 } 692 }, 693 { OLETTER_NONE, &no_vbell_optname, 694 O_BOOL, OPT_OFF, &no_vbell, NULL, 695 { 696 "Display visual bell", 697 "Don't display visual bell", 698 NULL 699 } 700 }, 701 { OLETTER_NONE, &modelines_optname, 702 O_NUMBER, 0, &modelines, NULL, 703 { 704 "Lines to read looking for modelines: ", 705 "Read %d lines looking for modelines", 706 NULL 707 } 708 }, 709 { OLETTER_NONE, &intr_optname, 710 O_STRING, 0, NULL, opt_intr, 711 { "interrupt character: ", "s", NULL } 712 }, 713 { OLETTER_NONE, &wordwrap_optname, 714 O_BOOL|O_REPAINT, OPT_OFF, &wordwrap, NULL, 715 { 716 "Wrap lines at any character", 717 "Wrap lines at spaces", 718 NULL 719 } 720 }, 721 { OLETTER_NONE, &show_preproc_error_optname, 722 O_BOOL, OPT_OFF, &show_preproc_error, NULL, 723 { 724 "Don't show error message if preprocessor fails", 725 "Show error message if preprocessor fails", 726 NULL 727 } 728 }, 729 { OLETTER_NONE, &proc_backspace_optname, 730 O_TRIPLE|O_REPAINT|O_HL_REPAINT, OPT_OFF, &proc_backspace, NULL, 731 { 732 "Backspace handling is specified by the -U option", 733 "Display underline text in underline mode", 734 "Print backspaces as ^H" 735 } 736 }, 737 { OLETTER_NONE, &proc_tab_optname, 738 O_TRIPLE|O_REPAINT|O_HL_REPAINT, OPT_OFF, &proc_tab, NULL, 739 { 740 "Tab handling is specified by the -U option", 741 "Expand tabs to spaces", 742 "Print tabs as ^I" 743 } 744 }, 745 { OLETTER_NONE, &proc_return_optname, 746 O_TRIPLE|O_REPAINT|O_HL_REPAINT, OPT_OFF, &proc_return, NULL, 747 { 748 "Carriage return handling is specified by the -U option", 749 "Delete carriage return before newline", 750 "Print carriage return as ^M" 751 } 752 }, 753 { OLETTER_NONE, &first_cmd_at_prompt_optname, 754 O_STRING|O_NO_TOGGLE|O_NO_QUERY, 0, NULL, opt_first_cmd_at_prompt, 755 { NULL, NULL, NULL } 756 }, 757 { OLETTER_NONE, &match_shift_optname, 758 O_STRING|O_INIT_HANDLER, 0, NULL, opt_match_shift, 759 { 760 "Search match shift: ", 761 ".d", 762 NULL 763 } 764 }, 765 #if LESSTEST 766 { OLETTER_NONE, &ttyin_name_optname, 767 O_STRING|O_NO_TOGGLE, 0, NULL, opt_ttyin_name, 768 { 769 NULL, 770 NULL, 771 NULL 772 } 773 }, 774 #endif /*LESSTEST*/ 775 { '\0', NULL, O_NOVAR, 0, NULL, NULL, { NULL, NULL, NULL } } 776 }; 777 778 779 /* 780 * Initialize each option to its default value. 781 */ 782 public void init_option(void) 783 { 784 struct loption *o; 785 constant char *p; 786 787 p = lgetenv("LESS_IS_MORE"); 788 if (!isnullenv(p) && !(p[0] == '0' && p[1] == '\0')) 789 less_is_more = 1; 790 791 for (o = option; o->oletter != '\0'; o++) 792 { 793 /* 794 * Set each variable to its default. 795 */ 796 if (o->ovar != NULL) 797 *(o->ovar) = o->odefault; 798 if (o->otype & O_INIT_HANDLER) 799 (*(o->ofunc))(INIT, (char *) NULL); 800 } 801 } 802 803 /* 804 * Find an option in the option table, given its option letter. 805 */ 806 public struct loption * findopt(int c) 807 { 808 struct loption *o; 809 810 for (o = option; o->oletter != '\0'; o++) 811 { 812 if (o->oletter == c) 813 return (o); 814 if ((o->otype & O_TRIPLE) && ASCII_TO_UPPER(o->oletter) == c) 815 return (o); 816 } 817 return (NULL); 818 } 819 820 /* 821 * 822 */ 823 static lbool is_optchar(char c) 824 { 825 if (ASCII_IS_UPPER(c)) 826 return TRUE; 827 if (ASCII_IS_LOWER(c)) 828 return TRUE; 829 if (c == '-') 830 return TRUE; 831 return FALSE; 832 } 833 834 /* 835 * Find an option in the option table, given its option name. 836 * p_optname is the (possibly partial) name to look for, and 837 * is updated to point after the matched name. 838 * p_oname if non-NULL is set to point to the full option name. 839 */ 840 public struct loption * findopt_name(constant char **p_optname, constant char **p_oname, lbool *p_ambig) 841 { 842 constant char *optname = *p_optname; 843 struct loption *o; 844 struct optname *oname; 845 size_t len; 846 int uppercase; 847 struct loption *maxo = NULL; 848 struct optname *maxoname = NULL; 849 size_t maxlen = 0; 850 lbool ambig = FALSE; 851 lbool exact = FALSE; 852 853 /* 854 * Check all options. 855 */ 856 for (o = option; o->oletter != '\0'; o++) 857 { 858 /* 859 * Check all names for this option. 860 */ 861 for (oname = o->onames; oname != NULL; oname = oname->onext) 862 { 863 /* 864 * Try normal match first (uppercase == 0), 865 * then, then if it's a TRIPLE option, 866 * try uppercase match (uppercase == 1). 867 */ 868 for (uppercase = 0; uppercase <= 1; uppercase++) 869 { 870 len = sprefix(optname, oname->oname, uppercase); 871 if (len == 0 || is_optchar(optname[len])) 872 { 873 /* 874 * We didn't use all of the option name. 875 */ 876 continue; 877 } 878 if (!exact && len == maxlen) 879 /* 880 * Already had a partial match, 881 * and now there's another one that 882 * matches the same length. 883 */ 884 ambig = TRUE; 885 else if (len > maxlen) 886 { 887 /* 888 * Found a better match than 889 * the one we had. 890 */ 891 maxo = o; 892 maxoname = oname; 893 maxlen = len; 894 ambig = FALSE; 895 exact = (len == strlen(oname->oname)); 896 } 897 if (!(o->otype & O_TRIPLE)) 898 break; 899 } 900 } 901 } 902 if (p_ambig != NULL) 903 *p_ambig = ambig; 904 if (ambig) 905 { 906 /* 907 * Name matched more than one option. 908 */ 909 return (NULL); 910 } 911 *p_optname = optname + maxlen; 912 if (p_oname != NULL) 913 *p_oname = maxoname == NULL ? NULL : maxoname->oname; 914 return (maxo); 915 } 916 917 /* 918 * Find all toggleable options whose names begin with a specified string. 919 * Return them in a space-separated string. 920 */ 921 public char * findopts_name(constant char *pfx) 922 { 923 constant struct loption *o; 924 constant struct optname *oname; 925 struct xbuffer xbuf; 926 int uppercase; 927 928 xbuf_init(&xbuf); 929 for (o = option; o->oletter != '\0'; o++) 930 { 931 if (o->otype & O_NO_TOGGLE) 932 continue; 933 for (oname = o->onames; oname != NULL; oname = oname->onext) 934 { 935 for (uppercase = 0; uppercase <= 1; uppercase++) 936 { 937 size_t len = sprefix(pfx, oname->oname, uppercase); 938 if (len >= strlen(pfx)) 939 { 940 constant char *np; 941 for (np = oname->oname; *np != '\0'; np++) 942 xbuf_add_char(&xbuf, uppercase && ASCII_IS_LOWER(*np) ? ASCII_TO_UPPER(*np) : *np); 943 xbuf_add_char(&xbuf, ' '); 944 } 945 if (!(o->otype & O_TRIPLE)) 946 break; 947 } 948 } 949 } 950 xbuf_pop(&xbuf); /* remove final space */ 951 xbuf_add_char(&xbuf, '\0'); 952 return (char *) xbuf.data; 953 } 954