contrib/less/opttbl.c

   1 /*
   2  * Copyright (C) 1984-2021  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;       /* */
  67 #if HILITE_SEARCH
  68 public int hilite_search;       /* Highlight matched search patterns? */
  69 #endif
  70
  71 public int less_is_more = 0;    /* Make compatible with POSIX more */
  72
  73 /*
  74  * Long option names.
  75  */
  76 static struct optname a_optname      = { "search-skip-screen",   NULL };
  77 static struct optname b_optname      = { "buffers",              NULL };
  78 static struct optname B__optname     = { "auto-buffers",         NULL };
  79 static struct optname c_optname      = { "clear-screen",         NULL };
  80 static struct optname d_optname      = { "dumb",                 NULL };
  81 static struct optname D__optname     = { "color",                NULL };
  82 static struct optname e_optname      = { "quit-at-eof",          NULL };
  83 static struct optname f_optname      = { "force",                NULL };
  84 static struct optname F__optname     = { "quit-if-one-screen",   NULL };
  85 #if HILITE_SEARCH
  86 static struct optname g_optname      = { "hilite-search",        NULL };
  87 #endif
  88 static struct optname h_optname      = { "max-back-scroll",      NULL };
  89 static struct optname i_optname      = { "ignore-case",          NULL };
  90 static struct optname j_optname      = { "jump-target",          NULL };
  91 static struct optname J__optname     = { "status-column",        NULL };
  92 #if USERFILE
  93 static struct optname k_optname      = { "lesskey-file",         NULL };
  94 #if HAVE_LESSKEYSRC
  95 static struct optname ks_optname     = { "lesskey-src",          NULL };
  96 #endif /* HAVE_LESSKEYSRC */
  97 #endif
  98 static struct optname K__optname     = { "quit-on-intr",         NULL };
  99 static struct optname L__optname     = { "no-lessopen",          NULL };
 100 static struct optname m_optname      = { "long-prompt",          NULL };
 101 static struct optname n_optname      = { "line-numbers",         NULL };
 102 #if LOGFILE
 103 static struct optname o_optname      = { "log-file",             NULL };
 104 static struct optname O__optname     = { "LOG-FILE",             NULL };
 105 #endif
 106 static struct optname p_optname      = { "pattern",              NULL };
 107 static struct optname P__optname     = { "prompt",               NULL };
 108 static struct optname q2_optname     = { "silent",               NULL };
 109 static struct optname q_optname      = { "quiet",                &q2_optname };
 110 static struct optname r_optname      = { "raw-control-chars",    NULL };
 111 static struct optname s_optname      = { "squeeze-blank-lines",  NULL };
 112 static struct optname S__optname     = { "chop-long-lines",      NULL };
 113 #if TAGS
 114 static struct optname t_optname      = { "tag",                  NULL };
 115 static struct optname T__optname     = { "tag-file",             NULL };
 116 #endif
 117 static struct optname u_optname      = { "underline-special",    NULL };
 118 static struct optname V__optname     = { "version",              NULL };
 119 static struct optname w_optname      = { "hilite-unread",        NULL };
 120 static struct optname x_optname      = { "tabs",                 NULL };
 121 static struct optname X__optname     = { "no-init",              NULL };
 122 static struct optname y_optname      = { "max-forw-scroll",      NULL };
 123 static struct optname z_optname      = { "window",               NULL };
 124 static struct optname quote_optname  = { "quotes",               NULL };
 125 static struct optname tilde_optname  = { "tilde",                NULL };
 126 static struct optname query_optname  = { "help",                 NULL };
 127 static struct optname pound_optname  = { "shift",                NULL };
 128 static struct optname keypad_optname = { "no-keypad",            NULL };
 129 static struct optname oldbot_optname = { "old-bot",              NULL };
 130 static struct optname follow_optname = { "follow-name",          NULL };
 131 static struct optname use_backslash_optname = { "use-backslash", NULL };
 132 static struct optname rscroll_optname = { "rscroll", NULL };
 133 static struct optname nohistdups_optname = { "no-histdups",      NULL };
 134 static struct optname mousecap_optname = { "mouse",              NULL };
 135 static struct optname wheel_lines_optname = { "wheel-lines",     NULL };
 136 static struct optname perma_marks_optname = { "save-marks",      NULL };
 137 static struct optname linenum_width_optname = { "line-num-width", NULL };
 138 static struct optname status_col_width_optname = { "status-col-width", NULL };
 139 static struct optname incr_search_optname = { "incsearch",       NULL };
 140 static struct optname use_color_optname = { "use-color",         NULL };
 141 static struct optname want_filesize_optname = { "file-size",     NULL };
 142 #if LESSTEST
 143 static struct optname ttyin_name_optname = { "tty",              NULL };
 144 static struct optname rstat_optname  = { "rstat",                NULL };
 145 #endif /*LESSTEST*/
 146
 147
 148 /*
 149  * Table of all options and their semantics.
 150  *
 151  * For BOOL and TRIPLE options, odesc[0], odesc[1], odesc[2] are
 152  * the description of the option when set to 0, 1 or 2, respectively.
 153  * For NUMBER options, odesc[0] is the prompt to use when entering
 154  * a new value, and odesc[1] is the description, which should contain
 155  * one %d which is replaced by the value of the number.
 156  * For STRING options, odesc[0] is the prompt to use when entering
 157  * a new value, and odesc[1], if not NULL, is the set of characters
 158  * that are valid in the string.
 159  */
 160 static struct loption option[] =
 161 {
 162         { 'a', &a_optname,
 163                 TRIPLE, OPT_ONPLUS, &how_search, NULL,
 164                 {
 165                         "Search includes displayed screen",
 166                         "Search skips displayed screen",
 167                         "Search includes all of displayed screen"
 168                 }
 169         },
 170
 171         { 'b', &b_optname,
 172                 NUMBER|INIT_HANDLER, 64, &bufspace, opt_b,
 173                 {
 174                         "Max buffer space per file (K): ",
 175                         "Max buffer space per file: %dK",
 176                         NULL
 177                 }
 178         },
 179         { 'B', &B__optname,
 180                 BOOL, OPT_ON, &autobuf, NULL,
 181                 {
 182                         "Don't automatically allocate buffers",
 183                         "Automatically allocate buffers when needed",
 184                         NULL
 185                 }
 186         },
 187         { 'c', &c_optname,
 188                 TRIPLE, OPT_OFF, &top_scroll, NULL,
 189                 {
 190                         "Repaint by scrolling from bottom of screen",
 191                         "Repaint by painting from top of screen",
 192                         "Repaint by painting from top of screen"
 193                 }
 194         },
 195         { 'd', &d_optname,
 196                 BOOL|NO_TOGGLE, OPT_OFF, &know_dumb, NULL,
 197                 {
 198                         "Assume intelligent terminal",
 199                         "Assume dumb terminal",
 200                         NULL
 201                 }
 202         },
 203         { 'D', &D__optname,
 204                 STRING|REPAINT|NO_QUERY, 0, NULL, opt_D,
 205                 {
 206                         "color desc: ",
 207                         NULL,
 208                         NULL
 209                 }
 210         },
 211         { 'e', &e_optname,
 212                 TRIPLE, OPT_OFF, &quit_at_eof, NULL,
 213                 {
 214                         "Don't quit at end-of-file",
 215                         "Quit at end-of-file",
 216                         "Quit immediately at end-of-file"
 217                 }
 218         },
 219         { 'f', &f_optname,
 220                 BOOL, OPT_OFF, &force_open, NULL,
 221                 {
 222                         "Open only regular files",
 223                         "Open even non-regular files",
 224                         NULL
 225                 }
 226         },
 227         { 'F', &F__optname,
 228                 BOOL, OPT_OFF, &quit_if_one_screen, NULL,
 229                 {
 230                         "Don't quit if end-of-file on first screen",
 231                         "Quit if end-of-file on first screen",
 232                         NULL
 233                 }
 234         },
 235 #if HILITE_SEARCH
 236         { 'g', &g_optname,
 237                 TRIPLE|HL_REPAINT, OPT_ONPLUS, &hilite_search, NULL,
 238                 {
 239                         "Don't highlight search matches",
 240                         "Highlight matches for previous search only",
 241                         "Highlight all matches for previous search pattern",
 242                 }
 243         },
 244 #endif
 245         { 'h', &h_optname,
 246                 NUMBER, -1, &back_scroll, NULL,
 247                 {
 248                         "Backwards scroll limit: ",
 249                         "Backwards scroll limit is %d lines",
 250                         NULL
 251                 }
 252         },
 253         { 'i', &i_optname,
 254                 TRIPLE|HL_REPAINT, OPT_OFF, &caseless, opt_i,
 255                 {
 256                         "Case is significant in searches",
 257                         "Ignore case in searches",
 258                         "Ignore case in searches and in patterns"
 259                 }
 260         },
 261         { 'j', &j_optname,
 262                 STRING, 0, NULL, opt_j,
 263                 {
 264                         "Target line: ",
 265                         "0123456789.-",
 266                         NULL
 267                 }
 268         },
 269         { 'J', &J__optname,
 270                 BOOL|REPAINT, OPT_OFF, &status_col, NULL,
 271                 {
 272                         "Don't display a status column",
 273                         "Display a status column",
 274                         NULL
 275                 }
 276         },
 277 #if USERFILE
 278         { 'k', &k_optname,
 279                 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_k,
 280                 { NULL, NULL, NULL }
 281         },
 282 #if HAVE_LESSKEYSRC
 283         { OLETTER_NONE, &ks_optname,
 284                 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_ks,
 285                 { NULL, NULL, NULL }
 286         },
 287 #endif /* HAVE_LESSKEYSRC */
 288 #endif
 289         { 'K', &K__optname,
 290                 BOOL, OPT_OFF, &quit_on_intr, NULL,
 291                 {
 292                         "Interrupt (ctrl-C) returns to prompt",
 293                         "Interrupt (ctrl-C) exits less",
 294                         NULL
 295                 }
 296         },
 297         { 'L', &L__optname,
 298                 BOOL, OPT_ON, &use_lessopen, NULL,
 299                 {
 300                         "Don't use the LESSOPEN filter",
 301                         "Use the LESSOPEN filter",
 302                         NULL
 303                 }
 304         },
 305         { 'm', &m_optname,
 306                 TRIPLE, OPT_OFF, &pr_type, NULL,
 307                 {
 308                         "Short prompt",
 309                         "Medium prompt",
 310                         "Long prompt"
 311                 }
 312         },
 313         { 'n', &n_optname,
 314                 TRIPLE|REPAINT, OPT_ON, &linenums, NULL,
 315                 {
 316                         "Don't use line numbers",
 317                         "Use line numbers",
 318                         "Constantly display line numbers"
 319                 }
 320         },
 321 #if LOGFILE
 322         { 'o', &o_optname,
 323                 STRING, 0, NULL, opt_o,
 324                 { "log file: ", NULL, NULL }
 325         },
 326         { 'O', &O__optname,
 327                 STRING, 0, NULL, opt__O,
 328                 { "Log file: ", NULL, NULL }
 329         },
 330 #endif
 331         { 'p', &p_optname,
 332                 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_p,
 333                 { NULL, NULL, NULL }
 334         },
 335         { 'P', &P__optname,
 336                 STRING, 0, NULL, opt__P,
 337                 { "prompt: ", NULL, NULL }
 338         },
 339         { 'q', &q_optname,
 340                 TRIPLE, OPT_OFF, &quiet, NULL,
 341                 {
 342                         "Ring the bell for errors AND at eof/bof",
 343                         "Ring the bell for errors but not at eof/bof",
 344                         "Never ring the bell"
 345                 }
 346         },
 347         { 'r', &r_optname,
 348                 TRIPLE|REPAINT, OPT_OFF, &ctldisp, NULL,
 349                 {
 350                         "Display control characters as ^X",
 351                         "Display control characters directly (not recommended)",
 352                         "Display ANSI sequences directly, other control characters as ^X"
 353                 }
 354         },
 355         { 's', &s_optname,
 356                 BOOL|REPAINT, OPT_OFF, &squeeze, NULL,
 357                 {
 358                         "Display all blank lines",
 359                         "Squeeze multiple blank lines",
 360                         NULL
 361                 }
 362         },
 363         { 'S', &S__optname,
 364                 BOOL|REPAINT, OPT_OFF, &chopline, NULL,
 365                 {
 366                         "Fold long lines",
 367                         "Chop long lines",
 368                         NULL
 369                 }
 370         },
 371 #if TAGS
 372         { 't', &t_optname,
 373                 STRING|NO_QUERY, 0, NULL, opt_t,
 374                 { "tag: ", NULL, NULL }
 375         },
 376         { 'T', &T__optname,
 377                 STRING, 0, NULL, opt__T,
 378                 { "tags file: ", NULL, NULL }
 379         },
 380 #endif
 381         { 'u', &u_optname,
 382                 TRIPLE|REPAINT, OPT_OFF, &bs_mode, NULL,
 383                 {
 384                         "Display underlined text in underline mode",
 385                         "Backspaces cause overstrike",
 386                         "Print backspace as ^H"
 387                 }
 388         },
 389         { 'V', &V__optname,
 390                 NOVAR, 0, NULL, opt__V,
 391                 { NULL, NULL, NULL }
 392         },
 393         { 'w', &w_optname,
 394                 TRIPLE|REPAINT, OPT_OFF, &show_attn, NULL,
 395                 {
 396                         "Don't highlight first unread line",
 397                         "Highlight first unread line after forward-screen",
 398                         "Highlight first unread line after any forward movement",
 399                 }
 400         },
 401         { 'x', &x_optname,
 402                 STRING|REPAINT, 0, NULL, opt_x,
 403                 {
 404                         "Tab stops: ",
 405                         "0123456789,",
 406                         NULL
 407                 }
 408         },
 409         { 'X', &X__optname,
 410                 BOOL|NO_TOGGLE, OPT_OFF, &no_init, NULL,
 411                 {
 412                         "Send init/deinit strings to terminal",
 413                         "Don't use init/deinit strings",
 414                         NULL
 415                 }
 416         },
 417         { 'y', &y_optname,
 418                 NUMBER, -1, &forw_scroll, NULL,
 419                 {
 420                         "Forward scroll limit: ",
 421                         "Forward scroll limit is %d lines",
 422                         NULL
 423                 }
 424         },
 425         { 'z', &z_optname,
 426                 NUMBER, -1, &swindow, NULL,
 427                 {
 428                         "Scroll window size: ",
 429                         "Scroll window size is %d lines",
 430                         NULL
 431                 }
 432         },
 433         { '"', &quote_optname,
 434                 STRING, 0, NULL, opt_quote,
 435                 { "quotes: ", NULL, NULL }
 436         },
 437         { '~', &tilde_optname,
 438                 BOOL|REPAINT, OPT_ON, &twiddle, NULL,
 439                 {
 440                         "Don't show tildes after end of file",
 441                         "Show tildes after end of file",
 442                         NULL
 443                 }
 444         },
 445         { '?', &query_optname,
 446                 NOVAR, 0, NULL, opt_query,
 447                 { NULL, NULL, NULL }
 448         },
 449         { '#', &pound_optname,
 450                 STRING, 0, NULL, opt_shift,
 451                 {
 452                         "Horizontal shift: ",
 453                         "0123456789.",
 454                         NULL
 455                 }
 456         },
 457         { OLETTER_NONE, &keypad_optname,
 458                 BOOL|NO_TOGGLE, OPT_OFF, &no_keypad, NULL,
 459                 {
 460                         "Use keypad mode",
 461                         "Don't use keypad mode",
 462                         NULL
 463                 }
 464         },
 465         { OLETTER_NONE, &oldbot_optname,
 466                 BOOL, OPT_OFF, &oldbot, NULL,
 467                 {
 468                         "Use new bottom of screen behavior",
 469                         "Use old bottom of screen behavior",
 470                         NULL
 471                 }
 472         },
 473         { OLETTER_NONE, &follow_optname,
 474                 BOOL, FOLLOW_DESC, &follow_mode, NULL,
 475                 {
 476                         "F command follows file descriptor",
 477                         "F command follows file name",
 478                         NULL
 479                 }
 480         },
 481         { OLETTER_NONE, &use_backslash_optname,
 482                 BOOL, OPT_OFF, &opt_use_backslash, NULL,
 483                 {
 484                         "Use backslash escaping in command line parameters",
 485                         "Don't use backslash escaping in command line parameters",
 486                         NULL
 487                 }
 488         },
 489         { OLETTER_NONE, &rscroll_optname,
 490                 STRING|REPAINT|INIT_HANDLER, 0, NULL, opt_rscroll,
 491                 { "right scroll character: ", NULL, NULL }
 492         },
 493         { OLETTER_NONE, &nohistdups_optname,
 494                 BOOL, OPT_OFF, &no_hist_dups, NULL,
 495                 {
 496                         "Allow duplicates in history list",
 497                         "Remove duplicates from history list",
 498                         NULL
 499                 }
 500         },
 501         { OLETTER_NONE, &mousecap_optname,
 502                 TRIPLE, OPT_OFF, &mousecap, opt_mousecap,
 503                 {
 504                         "Ignore mouse input",
 505                         "Use the mouse for scrolling",
 506                         "Use the mouse for scrolling (reverse)"
 507                 }
 508         },
 509         { OLETTER_NONE, &wheel_lines_optname,
 510                 NUMBER|INIT_HANDLER, 0, &wheel_lines, opt_wheel_lines,
 511                 {
 512                         "Lines to scroll on mouse wheel: ",
 513                         "Scroll %d line(s) on mouse wheel",
 514                         NULL
 515                 }
 516         },
 517         { OLETTER_NONE, &perma_marks_optname,
 518                 BOOL, OPT_OFF, &perma_marks, NULL,
 519                 {
 520                         "Don't save marks in history file",
 521                         "Save marks in history file",
 522                         NULL
 523                 }
 524         },
 525         { OLETTER_NONE, &linenum_width_optname,
 526                 NUMBER|REPAINT, MIN_LINENUM_WIDTH, &linenum_width, opt_linenum_width,
 527                 {
 528                         "Line number width: ",
 529                         "Line number width is %d chars",
 530                         NULL
 531                 }
 532         },
 533         { OLETTER_NONE, &status_col_width_optname,
 534                 NUMBER|REPAINT, 2, &status_col_width, opt_status_col_width,
 535                 {
 536                         "Status column width: ",
 537                         "Status column width is %d chars",
 538                         NULL
 539                 }
 540         },
 541         { OLETTER_NONE, &incr_search_optname,
 542                 BOOL, OPT_OFF, &incr_search, NULL,
 543                 {
 544                         "Incremental search is off",
 545                         "Incremental search is on",
 546                         NULL
 547                 }
 548         },
 549         { OLETTER_NONE, &use_color_optname,
 550                 BOOL|REPAINT, OPT_OFF, &use_color, NULL,
 551                 {
 552                         "Don't use color",
 553                         "Use color",
 554                         NULL
 555                 }
 556         },
 557         { OLETTER_NONE, &want_filesize_optname,
 558                 BOOL|REPAINT, OPT_OFF, &want_filesize, opt_filesize,
 559                 {
 560                         "Don't get size of each file",
 561                         "Get size of each file",
 562                         NULL
 563                 }
 564         },
 565 #if LESSTEST
 566         { OLETTER_NONE, &ttyin_name_optname,
 567                 STRING|NO_TOGGLE, 0, NULL, opt_ttyin_name,
 568                 {
 569                         NULL,
 570                         NULL,
 571                         NULL
 572                 }
 573         },
 574         { OLETTER_NONE, &rstat_optname,
 575                 STRING|NO_TOGGLE, 0, NULL, opt_rstat,
 576                 {
 577                         NULL,
 578                         NULL,
 579                         NULL
 580                 }
 581         },
 582 #endif /*LESSTEST*/
 583         { '\0', NULL, NOVAR, 0, NULL, NULL, { NULL, NULL, NULL } }
 584 };
 585
 586
 587 /*
 588  * Initialize each option to its default value.
 589  */
 590         public void
 591 init_option(VOID_PARAM)
 592 {
 593         struct loption *o;
 594         char *p;
 595
 596         p = lgetenv("LESS_IS_MORE");
 597         if (!isnullenv(p))
 598                 less_is_more = 1;
 599
 600         for (o = option;  o->oletter != '\0';  o++)
 601         {
 602                 /*
 603                  * Set each variable to its default.
 604                  */
 605                 if (o->ovar != NULL)
 606                         *(o->ovar) = o->odefault;
 607                 if (o->otype & INIT_HANDLER)
 608                         (*(o->ofunc))(INIT, (char *) NULL);
 609         }
 610 }
 611
 612 /*
 613  * Find an option in the option table, given its option letter.
 614  */
 615         public struct loption *
 616 findopt(c)
 617         int c;
 618 {
 619         struct loption *o;
 620
 621         for (o = option;  o->oletter != '\0';  o++)
 622         {
 623                 if (o->oletter == c)
 624                         return (o);
 625                 if ((o->otype & TRIPLE) && ASCII_TO_UPPER(o->oletter) == c)
 626                         return (o);
 627         }
 628         return (NULL);
 629 }
 630
 631 /*
 632  *
 633  */
 634         static int
 635 is_optchar(c)
 636         char c;
 637 {
 638         if (ASCII_IS_UPPER(c))
 639                 return 1;
 640         if (ASCII_IS_LOWER(c))
 641                 return 1;
 642         if (c == '-')
 643                 return 1;
 644         return 0;
 645 }
 646
 647 /*
 648  * Find an option in the option table, given its option name.
 649  * p_optname is the (possibly partial) name to look for, and
 650  * is updated to point after the matched name.
 651  * p_oname if non-NULL is set to point to the full option name.
 652  */
 653         public struct loption *
 654 findopt_name(p_optname, p_oname, p_err)
 655         char **p_optname;
 656         char **p_oname;
 657         int *p_err;
 658 {
 659         char *optname = *p_optname;
 660         struct loption *o;
 661         struct optname *oname;
 662         int len;
 663         int uppercase;
 664         struct loption *maxo = NULL;
 665         struct optname *maxoname = NULL;
 666         int maxlen = 0;
 667         int ambig = 0;
 668         int exact = 0;
 669
 670         /*
 671          * Check all options.
 672          */
 673         for (o = option;  o->oletter != '\0';  o++)
 674         {
 675                 /*
 676                  * Check all names for this option.
 677                  */
 678                 for (oname = o->onames;  oname != NULL;  oname = oname->onext)
 679                 {
 680                         /*
 681                          * Try normal match first (uppercase == 0),
 682                          * then, then if it's a TRIPLE option,
 683                          * try uppercase match (uppercase == 1).
 684                          */
 685                         for (uppercase = 0;  uppercase <= 1;  uppercase++)
 686                         {
 687                                 len = sprefix(optname, oname->oname, uppercase);
 688                                 if (len <= 0 || is_optchar(optname[len]))
 689                                 {
 690                                         /*
 691                                          * We didn't use all of the option name.
 692                                          */
 693                                         continue;
 694                                 }
 695                                 if (!exact && len == maxlen)
 696                                         /*
 697                                          * Already had a partial match,
 698                                          * and now there's another one that
 699                                          * matches the same length.
 700                                          */
 701                                         ambig = 1;
 702                                 else if (len > maxlen)
 703                                 {
 704                                         /*
 705                                          * Found a better match than
 706                                          * the one we had.
 707                                          */
 708                                         maxo = o;
 709                                         maxoname = oname;
 710                                         maxlen = len;
 711                                         ambig = 0;
 712                                         exact = (len == (int)strlen(oname->oname));
 713                                 }
 714                                 if (!(o->otype & TRIPLE))
 715                                         break;
 716                         }
 717                 }
 718         }
 719         if (ambig)
 720         {
 721                 /*
 722                  * Name matched more than one option.
 723                  */
 724                 if (p_err != NULL)
 725                         *p_err = OPT_AMBIG;
 726                 return (NULL);
 727         }
 728         *p_optname = optname + maxlen;
 729         if (p_oname != NULL)
 730                 *p_oname = maxoname == NULL ? NULL : maxoname->oname;
 731         return (maxo);
 732 }