1 /* 2 * Copyright (C) 1984-2022 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 how_search; /* Where should forward searches start? */ 23 public int top_scroll; /* Repaint screen from top? 24 (alternative is scroll from bottom) */ 25 public int pr_type; /* Type of prompt (short, medium, long) */ 26 public int bs_mode; /* How to process backspaces */ 27 public int know_dumb; /* Don't complain about dumb terminals */ 28 public int quit_at_eof; /* Quit after hitting end of file twice */ 29 public int quit_if_one_screen; /* Quit if EOF on first screen */ 30 public int squeeze; /* Squeeze multiple blank lines into one */ 31 public int tabstop; /* Tab settings */ 32 public int back_scroll; /* Repaint screen on backwards movement */ 33 public int forw_scroll; /* Repaint screen on forward movement */ 34 public int caseless; /* Do "caseless" searches */ 35 public int linenums; /* Use line numbers */ 36 public int autobuf; /* Automatically allocate buffers as needed */ 37 public int bufspace; /* Max buffer space per file (K) */ 38 public int ctldisp; /* Send control chars to screen untranslated */ 39 public int force_open; /* Open the file even if not regular file */ 40 public int swindow; /* Size of scrolling window */ 41 public int jump_sline; /* Screen line of "jump target" */ 42 public long jump_sline_fraction = -1; 43 public long shift_count_fraction = -1; 44 public int chopline; /* Truncate displayed lines at screen width */ 45 public int no_init; /* Disable sending ti/te termcap strings */ 46 public int no_keypad; /* Disable sending ks/ke termcap strings */ 47 public int twiddle; /* Show tildes after EOF */ 48 public int show_attn; /* Hilite first unread line */ 49 public int shift_count; /* Number of positions to shift horizontally */ 50 public int status_col; /* Display a status column */ 51 public int use_lessopen; /* Use the LESSOPEN filter */ 52 public int quit_on_intr; /* Quit on interrupt */ 53 public int follow_mode; /* F cmd Follows file desc or file name? */ 54 public int oldbot; /* Old bottom of screen behavior {{REMOVE}} */ 55 public int opt_use_backslash; /* Use backslash escaping in option parsing */ 56 public char rscroll_char; /* Char which marks chopped lines with -S */ 57 public int rscroll_attr; /* Attribute of rscroll_char */ 58 public int no_hist_dups; /* Remove dups from history list */ 59 public int mousecap; /* Allow mouse for scrolling */ 60 public int wheel_lines; /* Number of lines to scroll on mouse wheel scroll */ 61 public int perma_marks; /* Save marks in history file */ 62 public int linenum_width; /* Width of line numbers */ 63 public int status_col_width; /* Width of status column */ 64 public int incr_search; /* Incremental search */ 65 public int use_color; /* Use UI color */ 66 public int want_filesize; /* Scan to EOF if necessary to get file size */ 67 public int status_line; /* Highlight entire marked lines */ 68 public int header_lines; /* Freeze header lines at top of screen */ 69 public int header_cols; /* Freeze header columns at left of screen */ 70 public int nonum_headers; /* Don't give headers line numbers */ 71 public int redraw_on_quit; /* Redraw last screen after term deinit */ 72 public int def_search_type; /* */ 73 public int exit_F_on_close; /* Exit F command when input closes */ 74 #if HILITE_SEARCH 75 public int hilite_search; /* Highlight matched search patterns? */ 76 #endif 77 78 public int less_is_more = 0; /* Make compatible with POSIX more */ 79 80 /* 81 * Long option names. 82 */ 83 static struct optname a_optname = { "search-skip-screen", NULL }; 84 static struct optname b_optname = { "buffers", NULL }; 85 static struct optname B__optname = { "auto-buffers", NULL }; 86 static struct optname c_optname = { "clear-screen", NULL }; 87 static struct optname d_optname = { "dumb", NULL }; 88 static struct optname D__optname = { "color", NULL }; 89 static struct optname e_optname = { "quit-at-eof", NULL }; 90 static struct optname f_optname = { "force", NULL }; 91 static struct optname F__optname = { "quit-if-one-screen", NULL }; 92 #if HILITE_SEARCH 93 static struct optname g_optname = { "hilite-search", NULL }; 94 #endif 95 static struct optname h_optname = { "max-back-scroll", NULL }; 96 static struct optname i_optname = { "ignore-case", NULL }; 97 static struct optname j_optname = { "jump-target", NULL }; 98 static struct optname J__optname = { "status-column", NULL }; 99 #if USERFILE 100 static struct optname k_optname = { "lesskey-file", NULL }; 101 #if HAVE_LESSKEYSRC 102 static struct optname ks_optname = { "lesskey-src", NULL }; 103 #endif /* HAVE_LESSKEYSRC */ 104 #endif 105 static struct optname K__optname = { "quit-on-intr", NULL }; 106 static struct optname L__optname = { "no-lessopen", NULL }; 107 static struct optname m_optname = { "long-prompt", NULL }; 108 static struct optname n_optname = { "line-numbers", NULL }; 109 #if LOGFILE 110 static struct optname o_optname = { "log-file", NULL }; 111 static struct optname O__optname = { "LOG-FILE", NULL }; 112 #endif 113 static struct optname p_optname = { "pattern", NULL }; 114 static struct optname P__optname = { "prompt", NULL }; 115 static struct optname q2_optname = { "silent", NULL }; 116 static struct optname q_optname = { "quiet", &q2_optname }; 117 static struct optname r_optname = { "raw-control-chars", NULL }; 118 static struct optname s_optname = { "squeeze-blank-lines", NULL }; 119 static struct optname S__optname = { "chop-long-lines", NULL }; 120 #if TAGS 121 static struct optname t_optname = { "tag", NULL }; 122 static struct optname T__optname = { "tag-file", NULL }; 123 #endif 124 static struct optname u_optname = { "underline-special", NULL }; 125 static struct optname V__optname = { "version", NULL }; 126 static struct optname w_optname = { "hilite-unread", NULL }; 127 static struct optname x_optname = { "tabs", NULL }; 128 static struct optname X__optname = { "no-init", NULL }; 129 static struct optname y_optname = { "max-forw-scroll", NULL }; 130 static struct optname z_optname = { "window", NULL }; 131 static struct optname quote_optname = { "quotes", NULL }; 132 static struct optname tilde_optname = { "tilde", NULL }; 133 static struct optname query_optname = { "help", NULL }; 134 static struct optname pound_optname = { "shift", NULL }; 135 static struct optname keypad_optname = { "no-keypad", NULL }; 136 static struct optname oldbot_optname = { "old-bot", NULL }; 137 static struct optname follow_optname = { "follow-name", NULL }; 138 static struct optname use_backslash_optname = { "use-backslash", NULL }; 139 static struct optname rscroll_optname = { "rscroll", NULL }; 140 static struct optname nohistdups_optname = { "no-histdups", NULL }; 141 static struct optname mousecap_optname = { "mouse", NULL }; 142 static struct optname wheel_lines_optname = { "wheel-lines", NULL }; 143 static struct optname perma_marks_optname = { "save-marks", NULL }; 144 static struct optname linenum_width_optname = { "line-num-width", NULL }; 145 static struct optname status_col_width_optname = { "status-col-width", NULL }; 146 static struct optname incr_search_optname = { "incsearch", NULL }; 147 static struct optname use_color_optname = { "use-color", NULL }; 148 static struct optname want_filesize_optname = { "file-size", NULL }; 149 static struct optname status_line_optname = { "status-line", NULL }; 150 static struct optname header_optname = { "header", NULL }; 151 static struct optname nonum_headers_optname = { "no-number-headers", NULL }; 152 static struct optname redraw_on_quit_optname = { "redraw-on-quit", NULL }; 153 static struct optname search_type_optname = { "search-options", NULL }; 154 static struct optname exit_F_on_close_optname = { "exit-follow-on-close", NULL }; 155 #if LESSTEST 156 static struct optname ttyin_name_optname = { "tty", NULL }; 157 static struct optname rstat_optname = { "rstat", NULL }; 158 #endif /*LESSTEST*/ 159 160 161 /* 162 * Table of all options and their semantics. 163 * 164 * For BOOL and TRIPLE options, odesc[0], odesc[1], odesc[2] are 165 * the description of the option when set to 0, 1 or 2, respectively. 166 * For NUMBER options, odesc[0] is the prompt to use when entering 167 * a new value, and odesc[1] is the description, which should contain 168 * one %d which is replaced by the value of the number. 169 * For STRING options, odesc[0] is the prompt to use when entering 170 * a new value, and odesc[1], if not NULL, is the set of characters 171 * that are valid in the string. 172 */ 173 static struct loption option[] = 174 { 175 { 'a', &a_optname, 176 TRIPLE, OPT_ONPLUS, &how_search, NULL, 177 { 178 "Search includes displayed screen", 179 "Search skips displayed screen", 180 "Search includes all of displayed screen" 181 } 182 }, 183 184 { 'b', &b_optname, 185 NUMBER|INIT_HANDLER, 64, &bufspace, opt_b, 186 { 187 "Max buffer space per file (K): ", 188 "Max buffer space per file: %dK", 189 NULL 190 } 191 }, 192 { 'B', &B__optname, 193 BOOL, OPT_ON, &autobuf, NULL, 194 { 195 "Don't automatically allocate buffers", 196 "Automatically allocate buffers when needed", 197 NULL 198 } 199 }, 200 { 'c', &c_optname, 201 TRIPLE, OPT_OFF, &top_scroll, NULL, 202 { 203 "Repaint by scrolling from bottom of screen", 204 "Repaint by painting from top of screen", 205 "Repaint by painting from top of screen" 206 } 207 }, 208 { 'd', &d_optname, 209 BOOL|NO_TOGGLE, OPT_OFF, &know_dumb, NULL, 210 { 211 "Assume intelligent terminal", 212 "Assume dumb terminal", 213 NULL 214 } 215 }, 216 { 'D', &D__optname, 217 STRING|REPAINT|NO_QUERY, 0, NULL, opt_D, 218 { 219 "color desc: ", 220 NULL, 221 NULL 222 } 223 }, 224 { 'e', &e_optname, 225 TRIPLE, OPT_OFF, &quit_at_eof, NULL, 226 { 227 "Don't quit at end-of-file", 228 "Quit at end-of-file", 229 "Quit immediately at end-of-file" 230 } 231 }, 232 { 'f', &f_optname, 233 BOOL, OPT_OFF, &force_open, NULL, 234 { 235 "Open only regular files", 236 "Open even non-regular files", 237 NULL 238 } 239 }, 240 { 'F', &F__optname, 241 BOOL, OPT_OFF, &quit_if_one_screen, NULL, 242 { 243 "Don't quit if end-of-file on first screen", 244 "Quit if end-of-file on first screen", 245 NULL 246 } 247 }, 248 #if HILITE_SEARCH 249 { 'g', &g_optname, 250 TRIPLE|HL_REPAINT, OPT_ONPLUS, &hilite_search, NULL, 251 { 252 "Don't highlight search matches", 253 "Highlight matches for previous search only", 254 "Highlight all matches for previous search pattern", 255 } 256 }, 257 #endif 258 { 'h', &h_optname, 259 NUMBER, -1, &back_scroll, NULL, 260 { 261 "Backwards scroll limit: ", 262 "Backwards scroll limit is %d lines", 263 NULL 264 } 265 }, 266 { 'i', &i_optname, 267 TRIPLE|HL_REPAINT, OPT_OFF, &caseless, opt_i, 268 { 269 "Case is significant in searches", 270 "Ignore case in searches", 271 "Ignore case in searches and in patterns" 272 } 273 }, 274 { 'j', &j_optname, 275 STRING, 0, NULL, opt_j, 276 { 277 "Target line: ", 278 "0123456789.-", 279 NULL 280 } 281 }, 282 { 'J', &J__optname, 283 BOOL|REPAINT, OPT_OFF, &status_col, NULL, 284 { 285 "Don't display a status column", 286 "Display a status column", 287 NULL 288 } 289 }, 290 #if USERFILE 291 { 'k', &k_optname, 292 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_k, 293 { NULL, NULL, NULL } 294 }, 295 #if HAVE_LESSKEYSRC 296 { OLETTER_NONE, &ks_optname, 297 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_ks, 298 { NULL, NULL, NULL } 299 }, 300 #endif /* HAVE_LESSKEYSRC */ 301 #endif 302 { 'K', &K__optname, 303 BOOL, OPT_OFF, &quit_on_intr, NULL, 304 { 305 "Interrupt (ctrl-C) returns to prompt", 306 "Interrupt (ctrl-C) exits less", 307 NULL 308 } 309 }, 310 { 'L', &L__optname, 311 BOOL, OPT_ON, &use_lessopen, NULL, 312 { 313 "Don't use the LESSOPEN filter", 314 "Use the LESSOPEN filter", 315 NULL 316 } 317 }, 318 { 'm', &m_optname, 319 TRIPLE, OPT_OFF, &pr_type, NULL, 320 { 321 "Short prompt", 322 "Medium prompt", 323 "Long prompt" 324 } 325 }, 326 { 'n', &n_optname, 327 TRIPLE|REPAINT, OPT_ON, &linenums, NULL, 328 { 329 "Don't use line numbers", 330 "Use line numbers", 331 "Constantly display line numbers" 332 } 333 }, 334 #if LOGFILE 335 { 'o', &o_optname, 336 STRING, 0, NULL, opt_o, 337 { "log file: ", NULL, NULL } 338 }, 339 { 'O', &O__optname, 340 STRING, 0, NULL, opt__O, 341 { "Log file: ", NULL, NULL } 342 }, 343 #endif 344 { 'p', &p_optname, 345 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_p, 346 { NULL, NULL, NULL } 347 }, 348 { 'P', &P__optname, 349 STRING, 0, NULL, opt__P, 350 { "prompt: ", NULL, NULL } 351 }, 352 { 'q', &q_optname, 353 TRIPLE, OPT_OFF, &quiet, NULL, 354 { 355 "Ring the bell for errors AND at eof/bof", 356 "Ring the bell for errors but not at eof/bof", 357 "Never ring the bell" 358 } 359 }, 360 { 'r', &r_optname, 361 TRIPLE|REPAINT, OPT_OFF, &ctldisp, NULL, 362 { 363 "Display control characters as ^X", 364 "Display control characters directly (not recommended)", 365 "Display ANSI sequences directly, other control characters as ^X" 366 } 367 }, 368 { 's', &s_optname, 369 BOOL|REPAINT, OPT_OFF, &squeeze, NULL, 370 { 371 "Display all blank lines", 372 "Squeeze multiple blank lines", 373 NULL 374 } 375 }, 376 { 'S', &S__optname, 377 BOOL|REPAINT, OPT_OFF, &chopline, NULL, 378 { 379 "Fold long lines", 380 "Chop long lines", 381 NULL 382 } 383 }, 384 #if TAGS 385 { 't', &t_optname, 386 STRING|NO_QUERY, 0, NULL, opt_t, 387 { "tag: ", NULL, NULL } 388 }, 389 { 'T', &T__optname, 390 STRING, 0, NULL, opt__T, 391 { "tags file: ", NULL, NULL } 392 }, 393 #endif 394 { 'u', &u_optname, 395 TRIPLE|REPAINT, OPT_OFF, &bs_mode, NULL, 396 { 397 "Display underlined text in underline mode", 398 "Backspaces cause overstrike", 399 "Print backspace as ^H" 400 } 401 }, 402 { 'V', &V__optname, 403 NOVAR, 0, NULL, opt__V, 404 { NULL, NULL, NULL } 405 }, 406 { 'w', &w_optname, 407 TRIPLE|REPAINT, OPT_OFF, &show_attn, NULL, 408 { 409 "Don't highlight first unread line", 410 "Highlight first unread line after forward-screen", 411 "Highlight first unread line after any forward movement", 412 } 413 }, 414 { 'x', &x_optname, 415 STRING|REPAINT, 0, NULL, opt_x, 416 { 417 "Tab stops: ", 418 "0123456789,", 419 NULL 420 } 421 }, 422 { 'X', &X__optname, 423 BOOL|NO_TOGGLE, OPT_OFF, &no_init, NULL, 424 { 425 "Send init/deinit strings to terminal", 426 "Don't use init/deinit strings", 427 NULL 428 } 429 }, 430 { 'y', &y_optname, 431 NUMBER, -1, &forw_scroll, NULL, 432 { 433 "Forward scroll limit: ", 434 "Forward scroll limit is %d lines", 435 NULL 436 } 437 }, 438 { 'z', &z_optname, 439 NUMBER, -1, &swindow, NULL, 440 { 441 "Scroll window size: ", 442 "Scroll window size is %d lines", 443 NULL 444 } 445 }, 446 { '"', "e_optname, 447 STRING, 0, NULL, opt_quote, 448 { "quotes: ", NULL, NULL } 449 }, 450 { '~', &tilde_optname, 451 BOOL|REPAINT, OPT_ON, &twiddle, NULL, 452 { 453 "Don't show tildes after end of file", 454 "Show tildes after end of file", 455 NULL 456 } 457 }, 458 { '?', &query_optname, 459 NOVAR, 0, NULL, opt_query, 460 { NULL, NULL, NULL } 461 }, 462 { '#', £_optname, 463 STRING, 0, NULL, opt_shift, 464 { 465 "Horizontal shift: ", 466 "0123456789.", 467 NULL 468 } 469 }, 470 { OLETTER_NONE, &keypad_optname, 471 BOOL|NO_TOGGLE, OPT_OFF, &no_keypad, NULL, 472 { 473 "Use keypad mode", 474 "Don't use keypad mode", 475 NULL 476 } 477 }, 478 { OLETTER_NONE, &oldbot_optname, 479 BOOL, OPT_OFF, &oldbot, NULL, 480 { 481 "Use new bottom of screen behavior", 482 "Use old bottom of screen behavior", 483 NULL 484 } 485 }, 486 { OLETTER_NONE, &follow_optname, 487 BOOL, FOLLOW_DESC, &follow_mode, NULL, 488 { 489 "F command follows file descriptor", 490 "F command follows file name", 491 NULL 492 } 493 }, 494 { OLETTER_NONE, &use_backslash_optname, 495 BOOL, OPT_OFF, &opt_use_backslash, NULL, 496 { 497 "Use backslash escaping in command line parameters", 498 "Don't use backslash escaping in command line parameters", 499 NULL 500 } 501 }, 502 { OLETTER_NONE, &rscroll_optname, 503 STRING|REPAINT|INIT_HANDLER, 0, NULL, opt_rscroll, 504 { "right scroll character: ", NULL, NULL } 505 }, 506 { OLETTER_NONE, &nohistdups_optname, 507 BOOL, OPT_OFF, &no_hist_dups, NULL, 508 { 509 "Allow duplicates in history list", 510 "Remove duplicates from history list", 511 NULL 512 } 513 }, 514 { OLETTER_NONE, &mousecap_optname, 515 TRIPLE, OPT_OFF, &mousecap, opt_mousecap, 516 { 517 "Ignore mouse input", 518 "Use the mouse for scrolling", 519 "Use the mouse for scrolling (reverse)" 520 } 521 }, 522 { OLETTER_NONE, &wheel_lines_optname, 523 NUMBER|INIT_HANDLER, 0, &wheel_lines, opt_wheel_lines, 524 { 525 "Lines to scroll on mouse wheel: ", 526 "Scroll %d line(s) on mouse wheel", 527 NULL 528 } 529 }, 530 { OLETTER_NONE, &perma_marks_optname, 531 BOOL, OPT_OFF, &perma_marks, NULL, 532 { 533 "Don't save marks in history file", 534 "Save marks in history file", 535 NULL 536 } 537 }, 538 { OLETTER_NONE, &linenum_width_optname, 539 NUMBER|REPAINT, MIN_LINENUM_WIDTH, &linenum_width, opt_linenum_width, 540 { 541 "Line number width: ", 542 "Line number width is %d chars", 543 NULL 544 } 545 }, 546 { OLETTER_NONE, &status_col_width_optname, 547 NUMBER|REPAINT, 2, &status_col_width, opt_status_col_width, 548 { 549 "Status column width: ", 550 "Status column width is %d chars", 551 NULL 552 } 553 }, 554 { OLETTER_NONE, &incr_search_optname, 555 BOOL, OPT_OFF, &incr_search, NULL, 556 { 557 "Incremental search is off", 558 "Incremental search is on", 559 NULL 560 } 561 }, 562 { OLETTER_NONE, &use_color_optname, 563 BOOL|REPAINT, OPT_OFF, &use_color, NULL, 564 { 565 "Don't use color", 566 "Use color", 567 NULL 568 } 569 }, 570 { OLETTER_NONE, &want_filesize_optname, 571 BOOL|REPAINT, OPT_OFF, &want_filesize, opt_filesize, 572 { 573 "Don't get size of each file", 574 "Get size of each file", 575 NULL 576 } 577 }, 578 { OLETTER_NONE, &status_line_optname, 579 BOOL|REPAINT, OPT_OFF, &status_line, NULL, 580 { 581 "Don't color each line with its status column color", 582 "Color each line with its status column color", 583 NULL 584 } 585 }, 586 { OLETTER_NONE, &header_optname, 587 STRING|REPAINT, 0, NULL, opt_header, 588 { 589 "Header lines: ", 590 NULL, 591 NULL 592 } 593 }, 594 { OLETTER_NONE, &nonum_headers_optname, 595 BOOL|REPAINT, 0, &nonum_headers, NULL, 596 { 597 "Number header lines", 598 "Don't number header lines", 599 NULL 600 } 601 }, 602 { OLETTER_NONE, &redraw_on_quit_optname, 603 BOOL, OPT_OFF, &redraw_on_quit, NULL, 604 { 605 "Don't redraw screen when quitting", 606 "Redraw last screen when quitting", 607 NULL 608 } 609 }, 610 { OLETTER_NONE, &search_type_optname, 611 STRING, 0, NULL, opt_search_type, 612 { 613 "Search options: ", 614 NULL, 615 NULL 616 } 617 }, 618 { OLETTER_NONE, &exit_F_on_close_optname, 619 BOOL, OPT_OFF, &exit_F_on_close, NULL, 620 { 621 "Don't exit F command when input closes", 622 "Exit F command when input closes", 623 NULL 624 } 625 }, 626 #if LESSTEST 627 { OLETTER_NONE, &ttyin_name_optname, 628 STRING|NO_TOGGLE, 0, NULL, opt_ttyin_name, 629 { 630 NULL, 631 NULL, 632 NULL 633 } 634 }, 635 { OLETTER_NONE, &rstat_optname, 636 STRING|NO_TOGGLE, 0, NULL, opt_rstat, 637 { 638 NULL, 639 NULL, 640 NULL 641 } 642 }, 643 #endif /*LESSTEST*/ 644 { '\0', NULL, NOVAR, 0, NULL, NULL, { NULL, NULL, NULL } } 645 }; 646 647 648 /* 649 * Initialize each option to its default value. 650 */ 651 public void 652 init_option(VOID_PARAM) 653 { 654 struct loption *o; 655 char *p; 656 657 p = lgetenv("LESS_IS_MORE"); 658 if (!isnullenv(p)) 659 less_is_more = 1; 660 661 for (o = option; o->oletter != '\0'; o++) 662 { 663 /* 664 * Set each variable to its default. 665 */ 666 if (o->ovar != NULL) 667 *(o->ovar) = o->odefault; 668 if (o->otype & INIT_HANDLER) 669 (*(o->ofunc))(INIT, (char *) NULL); 670 } 671 } 672 673 /* 674 * Find an option in the option table, given its option letter. 675 */ 676 public struct loption * 677 findopt(c) 678 int c; 679 { 680 struct loption *o; 681 682 for (o = option; o->oletter != '\0'; o++) 683 { 684 if (o->oletter == c) 685 return (o); 686 if ((o->otype & TRIPLE) && ASCII_TO_UPPER(o->oletter) == c) 687 return (o); 688 } 689 return (NULL); 690 } 691 692 /* 693 * 694 */ 695 static int 696 is_optchar(c) 697 char c; 698 { 699 if (ASCII_IS_UPPER(c)) 700 return 1; 701 if (ASCII_IS_LOWER(c)) 702 return 1; 703 if (c == '-') 704 return 1; 705 return 0; 706 } 707 708 /* 709 * Find an option in the option table, given its option name. 710 * p_optname is the (possibly partial) name to look for, and 711 * is updated to point after the matched name. 712 * p_oname if non-NULL is set to point to the full option name. 713 */ 714 public struct loption * 715 findopt_name(p_optname, p_oname, p_err) 716 char **p_optname; 717 char **p_oname; 718 int *p_err; 719 { 720 char *optname = *p_optname; 721 struct loption *o; 722 struct optname *oname; 723 int len; 724 int uppercase; 725 struct loption *maxo = NULL; 726 struct optname *maxoname = NULL; 727 int maxlen = 0; 728 int ambig = 0; 729 int exact = 0; 730 731 /* 732 * Check all options. 733 */ 734 for (o = option; o->oletter != '\0'; o++) 735 { 736 /* 737 * Check all names for this option. 738 */ 739 for (oname = o->onames; oname != NULL; oname = oname->onext) 740 { 741 /* 742 * Try normal match first (uppercase == 0), 743 * then, then if it's a TRIPLE option, 744 * try uppercase match (uppercase == 1). 745 */ 746 for (uppercase = 0; uppercase <= 1; uppercase++) 747 { 748 len = sprefix(optname, oname->oname, uppercase); 749 if (len <= 0 || is_optchar(optname[len])) 750 { 751 /* 752 * We didn't use all of the option name. 753 */ 754 continue; 755 } 756 if (!exact && len == maxlen) 757 /* 758 * Already had a partial match, 759 * and now there's another one that 760 * matches the same length. 761 */ 762 ambig = 1; 763 else if (len > maxlen) 764 { 765 /* 766 * Found a better match than 767 * the one we had. 768 */ 769 maxo = o; 770 maxoname = oname; 771 maxlen = len; 772 ambig = 0; 773 exact = (len == (int)strlen(oname->oname)); 774 } 775 if (!(o->otype & TRIPLE)) 776 break; 777 } 778 } 779 } 780 if (ambig) 781 { 782 /* 783 * Name matched more than one option. 784 */ 785 if (p_err != NULL) 786 *p_err = OPT_AMBIG; 787 return (NULL); 788 } 789 *p_optname = optname + maxlen; 790 if (p_oname != NULL) 791 *p_oname = maxoname == NULL ? NULL : maxoname->oname; 792 return (maxo); 793 } 794