1 /* 2 * Copyright (C) 1984-2023 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 long shift_count_fraction = -1; 45 public int chopline; /* Truncate displayed lines at screen width */ 46 public int wordwrap; /* Wrap lines at space */ 47 public int no_init; /* Disable sending ti/te termcap strings */ 48 public int no_keypad; /* Disable sending ks/ke termcap strings */ 49 public int twiddle; /* Show tildes after EOF */ 50 public int show_attn; /* Hilite first unread line */ 51 public int shift_count; /* Number of positions to shift horizontally */ 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 char 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_headers; /* Don't search in header lines or columns */ 74 public int redraw_on_quit; /* Redraw last screen after term deinit */ 75 public int def_search_type; /* */ 76 public int exit_F_on_close; /* Exit F command when input closes */ 77 public int modelines; /* Lines to read looking for modelines */ 78 public int show_preproc_error; /* Display msg when preproc exits with error */ 79 public int proc_backspace; /* Special handling of backspace */ 80 public int proc_tab; /* Special handling of tab */ 81 public int proc_return; /* Special handling of carriage return */ 82 public char intr_char = CONTROL('X'); /* Char to interrupt reads */ 83 #if HILITE_SEARCH 84 public int hilite_search; /* Highlight matched search patterns? */ 85 #endif 86 87 public int less_is_more = 0; /* Make compatible with POSIX more */ 88 89 /* 90 * Long option names. 91 */ 92 static struct optname a_optname = { "search-skip-screen", NULL }; 93 static struct optname b_optname = { "buffers", NULL }; 94 static struct optname B__optname = { "auto-buffers", NULL }; 95 static struct optname c_optname = { "clear-screen", NULL }; 96 static struct optname d_optname = { "dumb", NULL }; 97 static struct optname D__optname = { "color", NULL }; 98 static struct optname e_optname = { "quit-at-eof", NULL }; 99 static struct optname f_optname = { "force", NULL }; 100 static struct optname F__optname = { "quit-if-one-screen", NULL }; 101 #if HILITE_SEARCH 102 static struct optname g_optname = { "hilite-search", NULL }; 103 #endif 104 static struct optname h_optname = { "max-back-scroll", NULL }; 105 static struct optname i_optname = { "ignore-case", NULL }; 106 static struct optname j_optname = { "jump-target", NULL }; 107 static struct optname J__optname = { "status-column", NULL }; 108 #if USERFILE 109 static struct optname k_optname = { "lesskey-file", NULL }; 110 #if HAVE_LESSKEYSRC 111 static struct optname ks_optname = { "lesskey-src", NULL }; 112 #endif /* HAVE_LESSKEYSRC */ 113 #endif 114 static struct optname K__optname = { "quit-on-intr", NULL }; 115 static struct optname L__optname = { "no-lessopen", NULL }; 116 static struct optname m_optname = { "long-prompt", NULL }; 117 static struct optname n_optname = { "line-numbers", NULL }; 118 #if LOGFILE 119 static struct optname o_optname = { "log-file", NULL }; 120 static struct optname O__optname = { "LOG-FILE", NULL }; 121 #endif 122 static struct optname p_optname = { "pattern", NULL }; 123 static struct optname P__optname = { "prompt", NULL }; 124 static struct optname q2_optname = { "silent", NULL }; 125 static struct optname q_optname = { "quiet", &q2_optname }; 126 static struct optname r_optname = { "raw-control-chars", NULL }; 127 static struct optname s_optname = { "squeeze-blank-lines", NULL }; 128 static struct optname S__optname = { "chop-long-lines", NULL }; 129 #if TAGS 130 static struct optname t_optname = { "tag", NULL }; 131 static struct optname T__optname = { "tag-file", NULL }; 132 #endif 133 static struct optname u_optname = { "underline-special", NULL }; 134 static struct optname V__optname = { "version", NULL }; 135 static struct optname w_optname = { "hilite-unread", NULL }; 136 static struct optname x_optname = { "tabs", NULL }; 137 static struct optname X__optname = { "no-init", NULL }; 138 static struct optname y_optname = { "max-forw-scroll", NULL }; 139 static struct optname z_optname = { "window", NULL }; 140 static struct optname quote_optname = { "quotes", NULL }; 141 static struct optname tilde_optname = { "tilde", NULL }; 142 static struct optname query_optname = { "help", NULL }; 143 static struct optname pound_optname = { "shift", NULL }; 144 static struct optname keypad_optname = { "no-keypad", NULL }; 145 static struct optname oldbot_optname = { "old-bot", NULL }; 146 static struct optname follow_optname = { "follow-name", NULL }; 147 static struct optname use_backslash_optname = { "use-backslash", NULL }; 148 static struct optname rscroll_optname = { "rscroll", NULL }; 149 static struct optname nohistdups_optname = { "no-histdups", NULL }; 150 static struct optname mousecap_optname = { "mouse", NULL }; 151 static struct optname wheel_lines_optname = { "wheel-lines", NULL }; 152 static struct optname perma_marks_optname = { "save-marks", NULL }; 153 static struct optname linenum_width_optname = { "line-num-width", NULL }; 154 static struct optname status_col_width_optname = { "status-col-width", NULL }; 155 static struct optname incr_search_optname = { "incsearch", NULL }; 156 static struct optname use_color_optname = { "use-color", NULL }; 157 static struct optname want_filesize_optname = { "file-size", NULL }; 158 static struct optname status_line_optname = { "status-line", NULL }; 159 static struct optname header_optname = { "header", NULL }; 160 static struct optname nonum_headers_optname = { "no-number-headers", NULL }; 161 static struct optname nosearch_headers_optname = { "no-search-headers", NULL }; 162 static struct optname redraw_on_quit_optname = { "redraw-on-quit", NULL }; 163 static struct optname search_type_optname = { "search-options", NULL }; 164 static struct optname exit_F_on_close_optname = { "exit-follow-on-close", NULL }; 165 static struct optname modelines_optname = { "modelines", NULL }; 166 static struct optname no_vbell_optname = { "no-vbell", NULL }; 167 static struct optname intr_optname = { "intr", NULL }; 168 static struct optname wordwrap_optname = { "wordwrap", NULL }; 169 static struct optname show_preproc_error_optname = { "show-preproc-errors", NULL }; 170 static struct optname proc_backspace_optname = { "proc-backspace", NULL }; 171 static struct optname proc_tab_optname = { "proc-tab", NULL }; 172 static struct optname proc_return_optname = { "proc-return", NULL }; 173 #if LESSTEST 174 static struct optname ttyin_name_optname = { "tty", NULL }; 175 #endif /*LESSTEST*/ 176 177 178 /* 179 * Table of all options and their semantics. 180 * 181 * For BOOL and TRIPLE options, odesc[0], odesc[1], odesc[2] are 182 * the description of the option when set to 0, 1 or 2, respectively. 183 * For NUMBER options, odesc[0] is the prompt to use when entering 184 * a new value, and odesc[1] is the description, which should contain 185 * one %d which is replaced by the value of the number. 186 * For STRING options, odesc[0] is the prompt to use when entering 187 * a new value, and odesc[1], if not NULL, is the set of characters 188 * that are valid in the string. 189 */ 190 static struct loption option[] = 191 { 192 { 'a', &a_optname, 193 TRIPLE, OPT_ONPLUS, &how_search, NULL, 194 { 195 "Search includes displayed screen", 196 "Search skips displayed screen", 197 "Search includes all of displayed screen" 198 } 199 }, 200 201 { 'b', &b_optname, 202 NUMBER|INIT_HANDLER, 64, &bufspace, opt_b, 203 { 204 "Max buffer space per file (K): ", 205 "Max buffer space per file: %dK", 206 NULL 207 } 208 }, 209 { 'B', &B__optname, 210 BOOL, OPT_ON, &autobuf, NULL, 211 { 212 "Don't automatically allocate buffers", 213 "Automatically allocate buffers when needed", 214 NULL 215 } 216 }, 217 { 'c', &c_optname, 218 TRIPLE, OPT_OFF, &top_scroll, NULL, 219 { 220 "Repaint by scrolling from bottom of screen", 221 "Repaint by painting from top of screen", 222 "Repaint by painting from top of screen" 223 } 224 }, 225 { 'd', &d_optname, 226 BOOL|NO_TOGGLE, OPT_OFF, &know_dumb, NULL, 227 { 228 "Assume intelligent terminal", 229 "Assume dumb terminal", 230 NULL 231 } 232 }, 233 { 'D', &D__optname, 234 STRING|REPAINT|NO_QUERY, 0, NULL, opt_D, 235 { 236 "color desc: ", 237 NULL, 238 NULL 239 } 240 }, 241 { 'e', &e_optname, 242 TRIPLE, OPT_OFF, &quit_at_eof, NULL, 243 { 244 "Don't quit at end-of-file", 245 "Quit at end-of-file", 246 "Quit immediately at end-of-file" 247 } 248 }, 249 { 'f', &f_optname, 250 BOOL, OPT_OFF, &force_open, NULL, 251 { 252 "Open only regular files", 253 "Open even non-regular files", 254 NULL 255 } 256 }, 257 { 'F', &F__optname, 258 BOOL, OPT_OFF, &quit_if_one_screen, NULL, 259 { 260 "Don't quit if end-of-file on first screen", 261 "Quit if end-of-file on first screen", 262 NULL 263 } 264 }, 265 #if HILITE_SEARCH 266 { 'g', &g_optname, 267 TRIPLE|HL_REPAINT, OPT_ONPLUS, &hilite_search, NULL, 268 { 269 "Don't highlight search matches", 270 "Highlight matches for previous search only", 271 "Highlight all matches for previous search pattern", 272 } 273 }, 274 #endif 275 { 'h', &h_optname, 276 NUMBER, -1, &back_scroll, NULL, 277 { 278 "Backwards scroll limit: ", 279 "Backwards scroll limit is %d lines", 280 NULL 281 } 282 }, 283 { 'i', &i_optname, 284 TRIPLE|HL_REPAINT, OPT_OFF, &caseless, opt_i, 285 { 286 "Case is significant in searches", 287 "Ignore case in searches", 288 "Ignore case in searches and in patterns" 289 } 290 }, 291 { 'j', &j_optname, 292 STRING, 0, NULL, opt_j, 293 { 294 "Target line: ", 295 "0123456789.-", 296 NULL 297 } 298 }, 299 { 'J', &J__optname, 300 BOOL|REPAINT, OPT_OFF, &status_col, NULL, 301 { 302 "Don't display a status column", 303 "Display a status column", 304 NULL 305 } 306 }, 307 #if USERFILE 308 { 'k', &k_optname, 309 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_k, 310 { NULL, NULL, NULL } 311 }, 312 #if HAVE_LESSKEYSRC 313 { OLETTER_NONE, &ks_optname, 314 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_ks, 315 { NULL, NULL, NULL } 316 }, 317 #endif /* HAVE_LESSKEYSRC */ 318 #endif 319 { 'K', &K__optname, 320 BOOL, OPT_OFF, &quit_on_intr, NULL, 321 { 322 "Interrupt (ctrl-C) returns to prompt", 323 "Interrupt (ctrl-C) exits less", 324 NULL 325 } 326 }, 327 { 'L', &L__optname, 328 BOOL, OPT_ON, &use_lessopen, NULL, 329 { 330 "Don't use the LESSOPEN filter", 331 "Use the LESSOPEN filter", 332 NULL 333 } 334 }, 335 { 'm', &m_optname, 336 TRIPLE, OPT_OFF, &pr_type, NULL, 337 { 338 "Short prompt", 339 "Medium prompt", 340 "Long prompt" 341 } 342 }, 343 { 'n', &n_optname, 344 TRIPLE|REPAINT, OPT_ON, &linenums, NULL, 345 { 346 "Don't use line numbers", 347 "Use line numbers", 348 "Constantly display line numbers" 349 } 350 }, 351 #if LOGFILE 352 { 'o', &o_optname, 353 STRING, 0, NULL, opt_o, 354 { "log file: ", NULL, NULL } 355 }, 356 { 'O', &O__optname, 357 STRING, 0, NULL, opt__O, 358 { "Log file: ", NULL, NULL } 359 }, 360 #endif 361 { 'p', &p_optname, 362 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_p, 363 { NULL, NULL, NULL } 364 }, 365 { 'P', &P__optname, 366 STRING, 0, NULL, opt__P, 367 { "prompt: ", NULL, NULL } 368 }, 369 { 'q', &q_optname, 370 TRIPLE, OPT_OFF, &quiet, NULL, 371 { 372 "Ring the bell for errors AND at eof/bof", 373 "Ring the bell for errors but not at eof/bof", 374 "Never ring the bell" 375 } 376 }, 377 { 'r', &r_optname, 378 TRIPLE|REPAINT, OPT_OFF, &ctldisp, NULL, 379 { 380 "Display control characters as ^X", 381 "Display control characters directly (not recommended)", 382 "Display ANSI sequences directly, other control characters as ^X" 383 } 384 }, 385 { 's', &s_optname, 386 BOOL|REPAINT, OPT_OFF, &squeeze, NULL, 387 { 388 "Display all blank lines", 389 "Squeeze multiple blank lines", 390 NULL 391 } 392 }, 393 { 'S', &S__optname, 394 BOOL|REPAINT, OPT_OFF, &chopline, NULL, 395 { 396 "Fold long lines", 397 "Chop long lines", 398 NULL 399 } 400 }, 401 #if TAGS 402 { 't', &t_optname, 403 STRING|NO_QUERY, 0, NULL, opt_t, 404 { "tag: ", NULL, NULL } 405 }, 406 { 'T', &T__optname, 407 STRING, 0, NULL, opt__T, 408 { "tags file: ", NULL, NULL } 409 }, 410 #endif 411 { 'u', &u_optname, 412 TRIPLE|REPAINT|HL_REPAINT, OPT_OFF, &bs_mode, NULL, 413 { 414 "Display underlined text in underline mode", 415 "Backspaces cause overstrike", 416 "Print backspace as ^H" 417 } 418 }, 419 { 'V', &V__optname, 420 NOVAR, 0, NULL, opt__V, 421 { NULL, NULL, NULL } 422 }, 423 { 'w', &w_optname, 424 TRIPLE|REPAINT, OPT_OFF, &show_attn, NULL, 425 { 426 "Don't highlight first unread line", 427 "Highlight first unread line after forward-screen", 428 "Highlight first unread line after any forward movement", 429 } 430 }, 431 { 'x', &x_optname, 432 STRING|REPAINT, 0, NULL, opt_x, 433 { 434 "Tab stops: ", 435 "0123456789,", 436 NULL 437 } 438 }, 439 { 'X', &X__optname, 440 BOOL|NO_TOGGLE, OPT_OFF, &no_init, NULL, 441 { 442 "Send init/deinit strings to terminal", 443 "Don't use init/deinit strings", 444 NULL 445 } 446 }, 447 { 'y', &y_optname, 448 NUMBER, -1, &forw_scroll, NULL, 449 { 450 "Forward scroll limit: ", 451 "Forward scroll limit is %d lines", 452 NULL 453 } 454 }, 455 { 'z', &z_optname, 456 NUMBER, -1, &swindow, NULL, 457 { 458 "Scroll window size: ", 459 "Scroll window size is %d lines", 460 NULL 461 } 462 }, 463 { '"', "e_optname, 464 STRING, 0, NULL, opt_quote, 465 { "quotes: ", NULL, NULL } 466 }, 467 { '~', &tilde_optname, 468 BOOL|REPAINT, OPT_ON, &twiddle, NULL, 469 { 470 "Don't show tildes after end of file", 471 "Show tildes after end of file", 472 NULL 473 } 474 }, 475 { '?', &query_optname, 476 NOVAR, 0, NULL, opt_query, 477 { NULL, NULL, NULL } 478 }, 479 { '#', £_optname, 480 STRING, 0, NULL, opt_shift, 481 { 482 "Horizontal shift: ", 483 "0123456789.", 484 NULL 485 } 486 }, 487 { OLETTER_NONE, &keypad_optname, 488 BOOL|NO_TOGGLE, OPT_OFF, &no_keypad, NULL, 489 { 490 "Use keypad mode", 491 "Don't use keypad mode", 492 NULL 493 } 494 }, 495 { OLETTER_NONE, &oldbot_optname, 496 BOOL, OPT_OFF, &oldbot, NULL, 497 { 498 "Use new bottom of screen behavior", 499 "Use old bottom of screen behavior", 500 NULL 501 } 502 }, 503 { OLETTER_NONE, &follow_optname, 504 BOOL, FOLLOW_DESC, &follow_mode, NULL, 505 { 506 "F command follows file descriptor", 507 "F command follows file name", 508 NULL 509 } 510 }, 511 { OLETTER_NONE, &use_backslash_optname, 512 BOOL, OPT_OFF, &opt_use_backslash, NULL, 513 { 514 "Use backslash escaping in command line parameters", 515 "Don't use backslash escaping in command line parameters", 516 NULL 517 } 518 }, 519 { OLETTER_NONE, &rscroll_optname, 520 STRING|REPAINT|INIT_HANDLER, 0, NULL, opt_rscroll, 521 { "rscroll character: ", NULL, NULL } 522 }, 523 { OLETTER_NONE, &nohistdups_optname, 524 BOOL, OPT_OFF, &no_hist_dups, NULL, 525 { 526 "Allow duplicates in history list", 527 "Remove duplicates from history list", 528 NULL 529 } 530 }, 531 { OLETTER_NONE, &mousecap_optname, 532 TRIPLE, OPT_OFF, &mousecap, opt_mousecap, 533 { 534 "Ignore mouse input", 535 "Use the mouse for scrolling", 536 "Use the mouse for scrolling (reverse)" 537 } 538 }, 539 { OLETTER_NONE, &wheel_lines_optname, 540 NUMBER|INIT_HANDLER, 0, &wheel_lines, opt_wheel_lines, 541 { 542 "Lines to scroll on mouse wheel: ", 543 "Scroll %d line(s) on mouse wheel", 544 NULL 545 } 546 }, 547 { OLETTER_NONE, &perma_marks_optname, 548 BOOL, OPT_OFF, &perma_marks, NULL, 549 { 550 "Don't save marks in history file", 551 "Save marks in history file", 552 NULL 553 } 554 }, 555 { OLETTER_NONE, &linenum_width_optname, 556 NUMBER|REPAINT, MIN_LINENUM_WIDTH, &linenum_width, opt_linenum_width, 557 { 558 "Line number width: ", 559 "Line number width is %d chars", 560 NULL 561 } 562 }, 563 { OLETTER_NONE, &status_col_width_optname, 564 NUMBER|REPAINT, 2, &status_col_width, opt_status_col_width, 565 { 566 "Status column width: ", 567 "Status column width is %d chars", 568 NULL 569 } 570 }, 571 { OLETTER_NONE, &incr_search_optname, 572 BOOL, OPT_OFF, &incr_search, NULL, 573 { 574 "Incremental search is off", 575 "Incremental search is on", 576 NULL 577 } 578 }, 579 { OLETTER_NONE, &use_color_optname, 580 BOOL|REPAINT, OPT_OFF, &use_color, NULL, 581 { 582 "Don't use color", 583 "Use color", 584 NULL 585 } 586 }, 587 { OLETTER_NONE, &want_filesize_optname, 588 BOOL|REPAINT, OPT_OFF, &want_filesize, opt_filesize, 589 { 590 "Don't get size of each file", 591 "Get size of each file", 592 NULL 593 } 594 }, 595 { OLETTER_NONE, &status_line_optname, 596 BOOL|REPAINT, OPT_OFF, &status_line, NULL, 597 { 598 "Don't color each line with its status column color", 599 "Color each line with its status column color", 600 NULL 601 } 602 }, 603 { OLETTER_NONE, &header_optname, 604 STRING|REPAINT, 0, NULL, opt_header, 605 { 606 "Header lines: ", 607 NULL, 608 NULL 609 } 610 }, 611 { OLETTER_NONE, &nonum_headers_optname, 612 BOOL|REPAINT, 0, &nonum_headers, NULL, 613 { 614 "Number header lines", 615 "Don't number header lines", 616 NULL 617 } 618 }, 619 { OLETTER_NONE, &nosearch_headers_optname, 620 BOOL|HL_REPAINT, 0, &nosearch_headers, NULL, 621 { 622 "Search includes header lines", 623 "Search does not include header lines", 624 NULL 625 } 626 }, 627 { OLETTER_NONE, &redraw_on_quit_optname, 628 BOOL, OPT_OFF, &redraw_on_quit, NULL, 629 { 630 "Don't redraw screen when quitting", 631 "Redraw last screen when quitting", 632 NULL 633 } 634 }, 635 { OLETTER_NONE, &search_type_optname, 636 STRING, 0, NULL, opt_search_type, 637 { 638 "Search options: ", 639 NULL, 640 NULL 641 } 642 }, 643 { OLETTER_NONE, &exit_F_on_close_optname, 644 BOOL, OPT_OFF, &exit_F_on_close, NULL, 645 { 646 "Don't exit F command when input closes", 647 "Exit F command when input closes", 648 NULL 649 } 650 }, 651 { OLETTER_NONE, &no_vbell_optname, 652 BOOL, OPT_OFF, &no_vbell, NULL, 653 { 654 "Display visual bell", 655 "Don't display visual bell", 656 NULL 657 } 658 }, 659 { OLETTER_NONE, &modelines_optname, 660 NUMBER, 0, &modelines, NULL, 661 { 662 "Lines to read looking for modelines: ", 663 "Read %d lines looking for modelines", 664 NULL 665 } 666 }, 667 { OLETTER_NONE, &intr_optname, 668 STRING, 0, NULL, opt_intr, 669 { "interrupt character: ", NULL, NULL } 670 }, 671 { OLETTER_NONE, &wordwrap_optname, 672 BOOL|REPAINT, OPT_OFF, &wordwrap, NULL, 673 { 674 "Wrap lines at any character", 675 "Wrap lines at spaces", 676 NULL 677 } 678 }, 679 { OLETTER_NONE, &show_preproc_error_optname, 680 BOOL, OPT_OFF, &show_preproc_error, NULL, 681 { 682 "Don't show error message if preprocessor fails", 683 "Show error message if preprocessor fails", 684 NULL 685 } 686 }, 687 { OLETTER_NONE, &proc_backspace_optname, 688 TRIPLE|REPAINT|HL_REPAINT, OPT_OFF, &proc_backspace, NULL, 689 { 690 "Backspace handling is specified by the -U option", 691 "Display underline text in underline mode", 692 "Print backspaces as ^H" 693 } 694 }, 695 { OLETTER_NONE, &proc_tab_optname, 696 TRIPLE|REPAINT|HL_REPAINT, OPT_OFF, &proc_tab, NULL, 697 { 698 "Tab handling is specified by the -U option", 699 "Expand tabs to spaces", 700 "Print tabs as ^I" 701 } 702 }, 703 { OLETTER_NONE, &proc_return_optname, 704 TRIPLE|REPAINT|HL_REPAINT, OPT_OFF, &proc_return, NULL, 705 { 706 "Carriage return handling is specified by the -U option", 707 "Delete carriage return before newline", 708 "Print carriage return as ^M" 709 } 710 }, 711 #if LESSTEST 712 { OLETTER_NONE, &ttyin_name_optname, 713 STRING|NO_TOGGLE, 0, NULL, opt_ttyin_name, 714 { 715 NULL, 716 NULL, 717 NULL 718 } 719 }, 720 #endif /*LESSTEST*/ 721 { '\0', NULL, NOVAR, 0, NULL, NULL, { NULL, NULL, NULL } } 722 }; 723 724 725 /* 726 * Initialize each option to its default value. 727 */ 728 public void init_option(void) 729 { 730 struct loption *o; 731 char *p; 732 733 p = lgetenv("LESS_IS_MORE"); 734 if (!isnullenv(p)) 735 less_is_more = 1; 736 737 for (o = option; o->oletter != '\0'; o++) 738 { 739 /* 740 * Set each variable to its default. 741 */ 742 if (o->ovar != NULL) 743 *(o->ovar) = o->odefault; 744 if (o->otype & INIT_HANDLER) 745 (*(o->ofunc))(INIT, (char *) NULL); 746 } 747 } 748 749 /* 750 * Find an option in the option table, given its option letter. 751 */ 752 public struct loption * findopt(int c) 753 { 754 struct loption *o; 755 756 for (o = option; o->oletter != '\0'; o++) 757 { 758 if (o->oletter == c) 759 return (o); 760 if ((o->otype & TRIPLE) && ASCII_TO_UPPER(o->oletter) == c) 761 return (o); 762 } 763 return (NULL); 764 } 765 766 /* 767 * 768 */ 769 static int is_optchar(char c) 770 { 771 if (ASCII_IS_UPPER(c)) 772 return 1; 773 if (ASCII_IS_LOWER(c)) 774 return 1; 775 if (c == '-') 776 return 1; 777 return 0; 778 } 779 780 /* 781 * Find an option in the option table, given its option name. 782 * p_optname is the (possibly partial) name to look for, and 783 * is updated to point after the matched name. 784 * p_oname if non-NULL is set to point to the full option name. 785 */ 786 public struct loption * findopt_name(char **p_optname, char **p_oname, int *p_err) 787 { 788 char *optname = *p_optname; 789 struct loption *o; 790 struct optname *oname; 791 int len; 792 int uppercase; 793 struct loption *maxo = NULL; 794 struct optname *maxoname = NULL; 795 int maxlen = 0; 796 int ambig = 0; 797 int exact = 0; 798 799 /* 800 * Check all options. 801 */ 802 for (o = option; o->oletter != '\0'; o++) 803 { 804 /* 805 * Check all names for this option. 806 */ 807 for (oname = o->onames; oname != NULL; oname = oname->onext) 808 { 809 /* 810 * Try normal match first (uppercase == 0), 811 * then, then if it's a TRIPLE option, 812 * try uppercase match (uppercase == 1). 813 */ 814 for (uppercase = 0; uppercase <= 1; uppercase++) 815 { 816 len = sprefix(optname, oname->oname, uppercase); 817 if (len <= 0 || is_optchar(optname[len])) 818 { 819 /* 820 * We didn't use all of the option name. 821 */ 822 continue; 823 } 824 if (!exact && len == maxlen) 825 /* 826 * Already had a partial match, 827 * and now there's another one that 828 * matches the same length. 829 */ 830 ambig = 1; 831 else if (len > maxlen) 832 { 833 /* 834 * Found a better match than 835 * the one we had. 836 */ 837 maxo = o; 838 maxoname = oname; 839 maxlen = len; 840 ambig = 0; 841 exact = (len == (int)strlen(oname->oname)); 842 } 843 if (!(o->otype & TRIPLE)) 844 break; 845 } 846 } 847 } 848 if (ambig) 849 { 850 /* 851 * Name matched more than one option. 852 */ 853 if (p_err != NULL) 854 *p_err = OPT_AMBIG; 855 return (NULL); 856 } 857 *p_optname = optname + maxlen; 858 if (p_oname != NULL) 859 *p_oname = maxoname == NULL ? NULL : maxoname->oname; 860 return (maxo); 861 } 862