1 /* $NetBSD: opttbl.c,v 1.6 2023/10/06 07:29:42 simonb Exp $ */ 2 3 /* 4 * Copyright (C) 1984-2023 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 */ 23 public int quiet; /* Should we suppress the audible bell? */ 24 public int no_vbell; /* Should we suppress the visual bell? */ 25 public int how_search; /* Where should forward searches start? */ 26 public int top_scroll; /* Repaint screen from top? 27 (alternative is scroll from bottom) */ 28 public int pr_type; /* Type of prompt (short, medium, long) */ 29 public int bs_mode; /* How to process backspaces */ 30 public int know_dumb; /* Don't complain about dumb terminals */ 31 public int quit_at_eof; /* Quit after hitting end of file twice */ 32 public int quit_if_one_screen; /* Quit if EOF on first screen */ 33 public int be_helpful; /* more(1) style -d */ 34 public int squeeze; /* Squeeze multiple blank lines into one */ 35 public int tabstop; /* Tab settings */ 36 public int back_scroll; /* Repaint screen on backwards movement */ 37 public int forw_scroll; /* Repaint screen on forward movement */ 38 public int caseless; /* Do "caseless" searches */ 39 public int linenums; /* Use line numbers */ 40 public int autobuf; /* Automatically allocate buffers as needed */ 41 public int bufspace; /* Max buffer space per file (K) */ 42 public int ctldisp; /* Send control chars to screen untranslated */ 43 public int force_open; /* Open the file even if not regular file */ 44 public int swindow; /* Size of scrolling window */ 45 public int jump_sline; /* Screen line of "jump target" */ 46 public long jump_sline_fraction = -1; 47 public long shift_count_fraction = -1; 48 public int chopline; /* Truncate displayed lines at screen width */ 49 public int wordwrap; /* Wrap lines at space */ 50 public int no_init; /* Disable sending ti/te termcap strings */ 51 public int no_keypad; /* Disable sending ks/ke termcap strings */ 52 public int twiddle; /* Show tildes after EOF */ 53 public int show_attn; /* Hilite first unread line */ 54 public int shift_count; /* Number of positions to shift horizontally */ 55 public int status_col; /* Display a status column */ 56 public int use_lessopen; /* Use the LESSOPEN filter */ 57 public int quit_on_intr; /* Quit on interrupt */ 58 public int follow_mode; /* F cmd Follows file desc or file name? */ 59 public int oldbot; /* Old bottom of screen behavior {{REMOVE}} */ 60 public int opt_use_backslash; /* Use backslash escaping in option parsing */ 61 public char rscroll_char; /* Char which marks chopped lines with -S */ 62 public int rscroll_attr; /* Attribute of rscroll_char */ 63 public int no_hist_dups; /* Remove dups from history list */ 64 public int mousecap; /* Allow mouse for scrolling */ 65 public int wheel_lines; /* Number of lines to scroll on mouse wheel scroll */ 66 public int perma_marks; /* Save marks in history file */ 67 public int linenum_width; /* Width of line numbers */ 68 public int status_col_width; /* Width of status column */ 69 public int incr_search; /* Incremental search */ 70 public int use_color; /* Use UI color */ 71 public int want_filesize; /* Scan to EOF if necessary to get file size */ 72 public int status_line; /* Highlight entire marked lines */ 73 public int header_lines; /* Freeze header lines at top of screen */ 74 public int header_cols; /* Freeze header columns at left of screen */ 75 public int nonum_headers; /* Don't give headers line numbers */ 76 public int nosearch_headers; /* Don't search in header lines or columns */ 77 public int redraw_on_quit; /* Redraw last screen after term deinit */ 78 public int def_search_type; /* */ 79 public int exit_F_on_close; /* Exit F command when input closes */ 80 public int modelines; /* Lines to read looking for modelines */ 81 public int show_preproc_error; /* Display msg when preproc exits with error */ 82 public int proc_backspace; /* Special handling of backspace */ 83 public int proc_tab; /* Special handling of tab */ 84 public int proc_return; /* Special handling of carriage return */ 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 #endif /* HAVE_LESSKEYSRC */ 116 #endif 117 static struct optname K__optname = { "quit-on-intr", NULL }; 118 static struct optname L__optname = { "no-lessopen", NULL }; 119 static struct optname m_optname = { "long-prompt", NULL }; 120 static struct optname n_optname = { "line-numbers", NULL }; 121 #if LOGFILE 122 static struct optname o_optname = { "log-file", NULL }; 123 static struct optname O__optname = { "LOG-FILE", NULL }; 124 #endif 125 static struct optname p_optname = { "pattern", NULL }; 126 static struct optname P__optname = { "prompt", NULL }; 127 static struct optname q2_optname = { "silent", NULL }; 128 static struct optname q_optname = { "quiet", &q2_optname }; 129 static struct optname r_optname = { "raw-control-chars", NULL }; 130 static struct optname s_optname = { "squeeze-blank-lines", NULL }; 131 static struct optname S__optname = { "chop-long-lines", NULL }; 132 #if TAGS 133 static struct optname t_optname = { "tag", NULL }; 134 static struct optname T__optname = { "tag-file", NULL }; 135 #endif 136 static struct optname u_optname = { "underline-special", NULL }; 137 static struct optname V__optname = { "version", NULL }; 138 static struct optname w_optname = { "hilite-unread", NULL }; 139 static struct optname x_optname = { "tabs", NULL }; 140 static struct optname X__optname = { "no-init", NULL }; 141 static struct optname y_optname = { "max-forw-scroll", NULL }; 142 static struct optname z_optname = { "window", NULL }; 143 static struct optname quote_optname = { "quotes", NULL }; 144 static struct optname tilde_optname = { "tilde", NULL }; 145 static struct optname query_optname = { "help", NULL }; 146 static struct optname pound_optname = { "shift", NULL }; 147 static struct optname keypad_optname = { "no-keypad", NULL }; 148 static struct optname oldbot_optname = { "old-bot", NULL }; 149 static struct optname follow_optname = { "follow-name", NULL }; 150 static struct optname use_backslash_optname = { "use-backslash", NULL }; 151 static struct optname rscroll_optname = { "rscroll", NULL }; 152 static struct optname nohistdups_optname = { "no-histdups", NULL }; 153 static struct optname mousecap_optname = { "mouse", NULL }; 154 static struct optname wheel_lines_optname = { "wheel-lines", NULL }; 155 static struct optname perma_marks_optname = { "save-marks", NULL }; 156 static struct optname linenum_width_optname = { "line-num-width", NULL }; 157 static struct optname status_col_width_optname = { "status-col-width", NULL }; 158 static struct optname incr_search_optname = { "incsearch", NULL }; 159 static struct optname use_color_optname = { "use-color", NULL }; 160 static struct optname want_filesize_optname = { "file-size", NULL }; 161 static struct optname status_line_optname = { "status-line", NULL }; 162 static struct optname header_optname = { "header", NULL }; 163 static struct optname nonum_headers_optname = { "no-number-headers", NULL }; 164 static struct optname nosearch_headers_optname = { "no-search-headers", NULL }; 165 static struct optname redraw_on_quit_optname = { "redraw-on-quit", NULL }; 166 static struct optname search_type_optname = { "search-options", NULL }; 167 static struct optname exit_F_on_close_optname = { "exit-follow-on-close", NULL }; 168 static struct optname modelines_optname = { "modelines", NULL }; 169 static struct optname no_vbell_optname = { "no-vbell", NULL }; 170 static struct optname intr_optname = { "intr", NULL }; 171 static struct optname wordwrap_optname = { "wordwrap", NULL }; 172 static struct optname show_preproc_error_optname = { "show-preproc-errors", NULL }; 173 static struct optname proc_backspace_optname = { "proc-backspace", NULL }; 174 static struct optname proc_tab_optname = { "proc-tab", NULL }; 175 static struct optname proc_return_optname = { "proc-return", NULL }; 176 #if LESSTEST 177 static struct optname ttyin_name_optname = { "tty", NULL }; 178 #endif /*LESSTEST*/ 179 180 181 /* 182 * Table of all options and their semantics. 183 * 184 * For BOOL and TRIPLE options, odesc[0], odesc[1], odesc[2] are 185 * the description of the option when set to 0, 1 or 2, respectively. 186 * For NUMBER options, odesc[0] is the prompt to use when entering 187 * a new value, and odesc[1] is the description, which should contain 188 * one %d which is replaced by the value of the number. 189 * For STRING options, odesc[0] is the prompt to use when entering 190 * a new value, and odesc[1], if not NULL, is the set of characters 191 * that are valid in the string. 192 */ 193 static struct loption option[] = 194 { 195 { 'a', &a_optname, 196 TRIPLE, OPT_ONPLUS, &how_search, NULL, 197 { 198 "Search includes displayed screen", 199 "Search skips displayed screen", 200 "Search includes all of displayed screen" 201 } 202 }, 203 204 { 'b', &b_optname, 205 NUMBER|INIT_HANDLER, 64, &bufspace, opt_b, 206 { 207 "Max buffer space per file (K): ", 208 "Max buffer space per file: %dK", 209 NULL 210 } 211 }, 212 { 'B', &B__optname, 213 BOOL, OPT_ON, &autobuf, NULL, 214 { 215 "Don't automatically allocate buffers", 216 "Automatically allocate buffers when needed", 217 NULL 218 } 219 }, 220 { 'c', &c_optname, 221 TRIPLE, OPT_OFF, &top_scroll, NULL, 222 { 223 "Repaint by scrolling from bottom of screen", 224 "Repaint by painting from top of screen", 225 "Repaint by painting from top of screen" 226 } 227 }, 228 #if 1 229 { 'd', &d_optname, 230 BOOL, OPT_OFF, &be_helpful, NULL, 231 { "Be less helpful in prompts", 232 "Be helpful in prompts", 233 NULL } 234 }, 235 #endif 236 { -1, &d_optname, 237 BOOL|NO_TOGGLE, OPT_OFF, &know_dumb, NULL, 238 { 239 "Assume intelligent terminal", 240 "Assume dumb terminal", 241 NULL 242 } 243 }, 244 { 'D', &D__optname, 245 STRING|REPAINT|NO_QUERY, 0, NULL, opt_D, 246 { 247 "color desc: ", 248 NULL, 249 NULL 250 } 251 }, 252 { 'e', &e_optname, 253 TRIPLE, OPT_OFF, &quit_at_eof, NULL, 254 { 255 "Don't quit at end-of-file", 256 "Quit at end-of-file", 257 "Quit immediately at end-of-file" 258 } 259 }, 260 { 'f', &f_optname, 261 BOOL, OPT_OFF, &force_open, NULL, 262 { 263 "Open only regular files", 264 "Open even non-regular files", 265 NULL 266 } 267 }, 268 { 'F', &F__optname, 269 BOOL, OPT_OFF, &quit_if_one_screen, NULL, 270 { 271 "Don't quit if end-of-file on first screen", 272 "Quit if end-of-file on first screen", 273 NULL 274 } 275 }, 276 #if HILITE_SEARCH 277 { 'g', &g_optname, 278 TRIPLE|HL_REPAINT, OPT_ONPLUS, &hilite_search, NULL, 279 { 280 "Don't highlight search matches", 281 "Highlight matches for previous search only", 282 "Highlight all matches for previous search pattern", 283 } 284 }, 285 #endif 286 { 'h', &h_optname, 287 NUMBER, -1, &back_scroll, NULL, 288 { 289 "Backwards scroll limit: ", 290 "Backwards scroll limit is %d lines", 291 NULL 292 } 293 }, 294 { 'i', &i_optname, 295 TRIPLE|HL_REPAINT, OPT_OFF, &caseless, opt_i, 296 { 297 "Case is significant in searches", 298 "Ignore case in searches", 299 "Ignore case in searches and in patterns" 300 } 301 }, 302 { 'j', &j_optname, 303 STRING, 0, NULL, opt_j, 304 { 305 "Target line: ", 306 "0123456789.-", 307 NULL 308 } 309 }, 310 { 'J', &J__optname, 311 BOOL|REPAINT, OPT_OFF, &status_col, NULL, 312 { 313 "Don't display a status column", 314 "Display a status column", 315 NULL 316 } 317 }, 318 #if USERFILE 319 { 'k', &k_optname, 320 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_k, 321 { NULL, NULL, NULL } 322 }, 323 #if HAVE_LESSKEYSRC 324 { OLETTER_NONE, &ks_optname, 325 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_ks, 326 { NULL, NULL, NULL } 327 }, 328 #endif /* HAVE_LESSKEYSRC */ 329 #endif 330 { 'K', &K__optname, 331 BOOL, OPT_OFF, &quit_on_intr, NULL, 332 { 333 "Interrupt (ctrl-C) returns to prompt", 334 "Interrupt (ctrl-C) exits less", 335 NULL 336 } 337 }, 338 { 'L', &L__optname, 339 BOOL, OPT_ON, &use_lessopen, NULL, 340 { 341 "Don't use the LESSOPEN filter", 342 "Use the LESSOPEN filter", 343 NULL 344 } 345 }, 346 { 'm', &m_optname, 347 TRIPLE, OPT_OFF, &pr_type, NULL, 348 { 349 "Short prompt", 350 "Medium prompt", 351 "Long prompt" 352 } 353 }, 354 { 'n', &n_optname, 355 TRIPLE|REPAINT, OPT_ON, &linenums, NULL, 356 { 357 "Don't use line numbers", 358 "Use line numbers", 359 "Constantly display line numbers" 360 } 361 }, 362 #if LOGFILE 363 { 'o', &o_optname, 364 STRING, 0, NULL, opt_o, 365 { "log file: ", NULL, NULL } 366 }, 367 { 'O', &O__optname, 368 STRING, 0, NULL, opt__O, 369 { "Log file: ", NULL, NULL } 370 }, 371 #endif 372 { 'p', &p_optname, 373 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_p, 374 { NULL, NULL, NULL } 375 }, 376 { 'P', &P__optname, 377 STRING, 0, NULL, opt__P, 378 { "prompt: ", NULL, NULL } 379 }, 380 { 'q', &q_optname, 381 TRIPLE, OPT_OFF, &quiet, NULL, 382 { 383 "Ring the bell for errors AND at eof/bof", 384 "Ring the bell for errors but not at eof/bof", 385 "Never ring the bell" 386 } 387 }, 388 { 'r', &r_optname, 389 TRIPLE|REPAINT, OPT_OFF, &ctldisp, NULL, 390 { 391 "Display control characters as ^X", 392 "Display control characters directly (not recommended)", 393 "Display ANSI sequences directly, other control characters as ^X" 394 } 395 }, 396 { 's', &s_optname, 397 BOOL|REPAINT, OPT_OFF, &squeeze, NULL, 398 { 399 "Display all blank lines", 400 "Squeeze multiple blank lines", 401 NULL 402 } 403 }, 404 { 'S', &S__optname, 405 BOOL|REPAINT, OPT_OFF, &chopline, NULL, 406 { 407 "Fold long lines", 408 "Chop long lines", 409 NULL 410 } 411 }, 412 #if TAGS 413 { 't', &t_optname, 414 STRING|NO_QUERY, 0, NULL, opt_t, 415 { "tag: ", NULL, NULL } 416 }, 417 { 'T', &T__optname, 418 STRING, 0, NULL, opt__T, 419 { "tags file: ", NULL, NULL } 420 }, 421 #endif 422 { 'u', &u_optname, 423 TRIPLE|REPAINT|HL_REPAINT, OPT_OFF, &bs_mode, NULL, 424 { 425 "Display underlined text in underline mode", 426 "Backspaces cause overstrike", 427 "Print backspace as ^H" 428 } 429 }, 430 { 'V', &V__optname, 431 NOVAR, 0, NULL, opt__V, 432 { NULL, NULL, NULL } 433 }, 434 { 'w', &w_optname, 435 TRIPLE|REPAINT, OPT_OFF, &show_attn, NULL, 436 { 437 "Don't highlight first unread line", 438 "Highlight first unread line after forward-screen", 439 "Highlight first unread line after any forward movement", 440 } 441 }, 442 { 'x', &x_optname, 443 STRING|REPAINT, 0, NULL, opt_x, 444 { 445 "Tab stops: ", 446 "0123456789,", 447 NULL 448 } 449 }, 450 { 'X', &X__optname, 451 BOOL|NO_TOGGLE, OPT_OFF, &no_init, NULL, 452 { 453 "Send init/deinit strings to terminal", 454 "Don't use init/deinit strings", 455 NULL 456 } 457 }, 458 { 'y', &y_optname, 459 NUMBER, -1, &forw_scroll, NULL, 460 { 461 "Forward scroll limit: ", 462 "Forward scroll limit is %d lines", 463 NULL 464 } 465 }, 466 { 'z', &z_optname, 467 NUMBER, -1, &swindow, NULL, 468 { 469 "Scroll window size: ", 470 "Scroll window size is %d lines", 471 NULL 472 } 473 }, 474 { '"', "e_optname, 475 STRING, 0, NULL, opt_quote, 476 { "quotes: ", NULL, NULL } 477 }, 478 { '~', &tilde_optname, 479 BOOL|REPAINT, OPT_ON, &twiddle, NULL, 480 { 481 "Don't show tildes after end of file", 482 "Show tildes after end of file", 483 NULL 484 } 485 }, 486 { '?', &query_optname, 487 NOVAR, 0, NULL, opt_query, 488 { NULL, NULL, NULL } 489 }, 490 { '#', £_optname, 491 STRING, 0, NULL, opt_shift, 492 { 493 "Horizontal shift: ", 494 "0123456789.", 495 NULL 496 } 497 }, 498 { OLETTER_NONE, &keypad_optname, 499 BOOL|NO_TOGGLE, OPT_OFF, &no_keypad, NULL, 500 { 501 "Use keypad mode", 502 "Don't use keypad mode", 503 NULL 504 } 505 }, 506 { OLETTER_NONE, &oldbot_optname, 507 BOOL, OPT_OFF, &oldbot, NULL, 508 { 509 "Use new bottom of screen behavior", 510 "Use old bottom of screen behavior", 511 NULL 512 } 513 }, 514 { OLETTER_NONE, &follow_optname, 515 BOOL, FOLLOW_DESC, &follow_mode, NULL, 516 { 517 "F command follows file descriptor", 518 "F command follows file name", 519 NULL 520 } 521 }, 522 { OLETTER_NONE, &use_backslash_optname, 523 BOOL, OPT_OFF, &opt_use_backslash, NULL, 524 { 525 "Use backslash escaping in command line parameters", 526 "Don't use backslash escaping in command line parameters", 527 NULL 528 } 529 }, 530 { OLETTER_NONE, &rscroll_optname, 531 STRING|REPAINT|INIT_HANDLER, 0, NULL, opt_rscroll, 532 { "rscroll character: ", NULL, NULL } 533 }, 534 { OLETTER_NONE, &nohistdups_optname, 535 BOOL, OPT_OFF, &no_hist_dups, NULL, 536 { 537 "Allow duplicates in history list", 538 "Remove duplicates from history list", 539 NULL 540 } 541 }, 542 { OLETTER_NONE, &mousecap_optname, 543 TRIPLE, OPT_OFF, &mousecap, opt_mousecap, 544 { 545 "Ignore mouse input", 546 "Use the mouse for scrolling", 547 "Use the mouse for scrolling (reverse)" 548 } 549 }, 550 { OLETTER_NONE, &wheel_lines_optname, 551 NUMBER|INIT_HANDLER, 0, &wheel_lines, opt_wheel_lines, 552 { 553 "Lines to scroll on mouse wheel: ", 554 "Scroll %d line(s) on mouse wheel", 555 NULL 556 } 557 }, 558 { OLETTER_NONE, &perma_marks_optname, 559 BOOL, OPT_OFF, &perma_marks, NULL, 560 { 561 "Don't save marks in history file", 562 "Save marks in history file", 563 NULL 564 } 565 }, 566 { OLETTER_NONE, &linenum_width_optname, 567 NUMBER|REPAINT, MIN_LINENUM_WIDTH, &linenum_width, opt_linenum_width, 568 { 569 "Line number width: ", 570 "Line number width is %d chars", 571 NULL 572 } 573 }, 574 { OLETTER_NONE, &status_col_width_optname, 575 NUMBER|REPAINT, 2, &status_col_width, opt_status_col_width, 576 { 577 "Status column width: ", 578 "Status column width is %d chars", 579 NULL 580 } 581 }, 582 { OLETTER_NONE, &incr_search_optname, 583 BOOL, OPT_OFF, &incr_search, NULL, 584 { 585 "Incremental search is off", 586 "Incremental search is on", 587 NULL 588 } 589 }, 590 { OLETTER_NONE, &use_color_optname, 591 BOOL|REPAINT, OPT_OFF, &use_color, NULL, 592 { 593 "Don't use color", 594 "Use color", 595 NULL 596 } 597 }, 598 { OLETTER_NONE, &want_filesize_optname, 599 BOOL|REPAINT, OPT_OFF, &want_filesize, opt_filesize, 600 { 601 "Don't get size of each file", 602 "Get size of each file", 603 NULL 604 } 605 }, 606 { OLETTER_NONE, &status_line_optname, 607 BOOL|REPAINT, OPT_OFF, &status_line, NULL, 608 { 609 "Don't color each line with its status column color", 610 "Color each line with its status column color", 611 NULL 612 } 613 }, 614 { OLETTER_NONE, &header_optname, 615 STRING|REPAINT, 0, NULL, opt_header, 616 { 617 "Header lines: ", 618 NULL, 619 NULL 620 } 621 }, 622 { OLETTER_NONE, &nonum_headers_optname, 623 BOOL|REPAINT, 0, &nonum_headers, NULL, 624 { 625 "Number header lines", 626 "Don't number header lines", 627 NULL 628 } 629 }, 630 { OLETTER_NONE, &nosearch_headers_optname, 631 BOOL|HL_REPAINT, 0, &nosearch_headers, NULL, 632 { 633 "Search includes header lines", 634 "Search does not include header lines", 635 NULL 636 } 637 }, 638 { OLETTER_NONE, &redraw_on_quit_optname, 639 BOOL, OPT_OFF, &redraw_on_quit, NULL, 640 { 641 "Don't redraw screen when quitting", 642 "Redraw last screen when quitting", 643 NULL 644 } 645 }, 646 { OLETTER_NONE, &search_type_optname, 647 STRING, 0, NULL, opt_search_type, 648 { 649 "Search options: ", 650 NULL, 651 NULL 652 } 653 }, 654 { OLETTER_NONE, &exit_F_on_close_optname, 655 BOOL, OPT_OFF, &exit_F_on_close, NULL, 656 { 657 "Don't exit F command when input closes", 658 "Exit F command when input closes", 659 NULL 660 } 661 }, 662 { OLETTER_NONE, &no_vbell_optname, 663 BOOL, OPT_OFF, &no_vbell, NULL, 664 { 665 "Display visual bell", 666 "Don't display visual bell", 667 NULL 668 } 669 }, 670 { OLETTER_NONE, &modelines_optname, 671 NUMBER, 0, &modelines, NULL, 672 { 673 "Lines to read looking for modelines: ", 674 "Read %d lines looking for modelines", 675 NULL 676 } 677 }, 678 { OLETTER_NONE, &intr_optname, 679 STRING, 0, NULL, opt_intr, 680 { "interrupt character: ", NULL, NULL } 681 }, 682 { OLETTER_NONE, &wordwrap_optname, 683 BOOL|REPAINT, OPT_OFF, &wordwrap, NULL, 684 { 685 "Wrap lines at any character", 686 "Wrap lines at spaces", 687 NULL 688 } 689 }, 690 { OLETTER_NONE, &show_preproc_error_optname, 691 BOOL, OPT_OFF, &show_preproc_error, NULL, 692 { 693 "Don't show error message if preprocessor fails", 694 "Show error message if preprocessor fails", 695 NULL 696 } 697 }, 698 { OLETTER_NONE, &proc_backspace_optname, 699 TRIPLE|REPAINT|HL_REPAINT, OPT_OFF, &proc_backspace, NULL, 700 { 701 "Backspace handling is specified by the -U option", 702 "Display underline text in underline mode", 703 "Print backspaces as ^H" 704 } 705 }, 706 { OLETTER_NONE, &proc_tab_optname, 707 TRIPLE|REPAINT|HL_REPAINT, OPT_OFF, &proc_tab, NULL, 708 { 709 "Tab handling is specified by the -U option", 710 "Expand tabs to spaces", 711 "Print tabs as ^I" 712 } 713 }, 714 { OLETTER_NONE, &proc_return_optname, 715 TRIPLE|REPAINT|HL_REPAINT, OPT_OFF, &proc_return, NULL, 716 { 717 "Carriage return handling is specified by the -U option", 718 "Delete carriage return before newline", 719 "Print carriage return as ^M" 720 } 721 }, 722 #if LESSTEST 723 { OLETTER_NONE, &ttyin_name_optname, 724 STRING|NO_TOGGLE, 0, NULL, opt_ttyin_name, 725 { 726 NULL, 727 NULL, 728 NULL 729 } 730 }, 731 #endif /*LESSTEST*/ 732 { '\0', NULL, NOVAR, 0, NULL, NULL, { NULL, NULL, NULL } } 733 }; 734 735 736 /* 737 * Initialize each option to its default value. 738 */ 739 public void init_option(void) 740 { 741 struct loption *o; 742 char *p; 743 744 p = lgetenv("LESS_IS_MORE"); 745 if (!isnullenv(p)) 746 less_is_more = 1; 747 748 for (o = option; o->oletter != '\0'; o++) 749 { 750 /* 751 * Set each variable to its default. 752 */ 753 if (o->ovar != NULL) 754 *(o->ovar) = o->odefault; 755 if (o->otype & INIT_HANDLER) 756 (*(o->ofunc))(INIT, (char *) NULL); 757 } 758 } 759 760 /* 761 * Find an option in the option table, given its option letter. 762 */ 763 public struct loption * findopt(int c) 764 { 765 struct loption *o; 766 767 for (o = option; o->oletter != '\0'; o++) 768 { 769 if (o->oletter == c) 770 return (o); 771 if ((o->otype & TRIPLE) && ASCII_TO_UPPER(o->oletter) == c) 772 return (o); 773 } 774 return (NULL); 775 } 776 777 /* 778 * 779 */ 780 static int is_optchar(char c) 781 { 782 if (ASCII_IS_UPPER(c)) 783 return 1; 784 if (ASCII_IS_LOWER(c)) 785 return 1; 786 if (c == '-') 787 return 1; 788 return 0; 789 } 790 791 /* 792 * Find an option in the option table, given its option name. 793 * p_optname is the (possibly partial) name to look for, and 794 * is updated to point after the matched name. 795 * p_oname if non-NULL is set to point to the full option name. 796 */ 797 public struct loption * findopt_name(char **p_optname, char **p_oname, int *p_err) 798 { 799 char *optname = *p_optname; 800 struct loption *o; 801 struct optname *oname; 802 int len; 803 int uppercase; 804 struct loption *maxo = NULL; 805 struct optname *maxoname = NULL; 806 int maxlen = 0; 807 int ambig = 0; 808 int exact = 0; 809 810 /* 811 * Check all options. 812 */ 813 for (o = option; o->oletter != '\0'; o++) 814 { 815 /* 816 * Check all names for this option. 817 */ 818 for (oname = o->onames; oname != NULL; oname = oname->onext) 819 { 820 /* 821 * Try normal match first (uppercase == 0), 822 * then, then if it's a TRIPLE option, 823 * try uppercase match (uppercase == 1). 824 */ 825 for (uppercase = 0; uppercase <= 1; uppercase++) 826 { 827 len = sprefix(optname, oname->oname, uppercase); 828 if (len <= 0 || is_optchar(optname[len])) 829 { 830 /* 831 * We didn't use all of the option name. 832 */ 833 continue; 834 } 835 if (!exact && len == maxlen) 836 /* 837 * Already had a partial match, 838 * and now there's another one that 839 * matches the same length. 840 */ 841 ambig = 1; 842 else if (len > maxlen) 843 { 844 /* 845 * Found a better match than 846 * the one we had. 847 */ 848 maxo = o; 849 maxoname = oname; 850 maxlen = len; 851 ambig = 0; 852 exact = (len == (int)strlen(oname->oname)); 853 } 854 if (!(o->otype & TRIPLE)) 855 break; 856 } 857 } 858 } 859 if (ambig) 860 { 861 /* 862 * Name matched more than one option. 863 */ 864 if (p_err != NULL) 865 *p_err = OPT_AMBIG; 866 return (NULL); 867 } 868 *p_optname = optname + maxlen; 869 if (p_oname != NULL) 870 *p_oname = maxoname == NULL ? NULL : maxoname->oname; 871 return (maxo); 872 } 873
Indexes created Thu Jun 11 00:25:07 UTC 2026