160786Sps/* 2240121Sdelphij * Copyright (C) 1984-2012 Mark Nudelman 360786Sps * 460786Sps * You may distribute under the terms of either the GNU General Public 560786Sps * License or the Less License, as specified in the README file. 660786Sps * 7240121Sdelphij * For more information, see the README file. 860786Sps */ 960786Sps 1060786Sps 1160786Sps/* 1260786Sps * The option table. 1360786Sps */ 1460786Sps 1560786Sps#include "less.h" 1660786Sps#include "option.h" 1760786Sps 1860786Sps/* 1960786Sps * Variables controlled by command line options. 2060786Sps */ 2160786Spspublic int quiet; /* Should we suppress the audible bell? */ 2260786Spspublic int how_search; /* Where should forward searches start? */ 2360786Spspublic int top_scroll; /* Repaint screen from top? 2460786Sps (alternative is scroll from bottom) */ 2560786Spspublic int pr_type; /* Type of prompt (short, medium, long) */ 2660786Spspublic int bs_mode; /* How to process backspaces */ 2760786Spspublic int know_dumb; /* Don't complain about dumb terminals */ 2860786Spspublic int quit_at_eof; /* Quit after hitting end of file twice */ 2960786Spspublic int quit_if_one_screen; /* Quit if EOF on first screen */ 3060786Spspublic int squeeze; /* Squeeze multiple blank lines into one */ 3160786Spspublic int tabstop; /* Tab settings */ 3260786Spspublic int back_scroll; /* Repaint screen on backwards movement */ 3360786Spspublic int forw_scroll; /* Repaint screen on forward movement */ 3460786Spspublic int caseless; /* Do "caseless" searches */ 3560786Spspublic int linenums; /* Use line numbers */ 3660786Spspublic int autobuf; /* Automatically allocate buffers as needed */ 37128345Stjrpublic int bufspace; /* Max buffer space per file (K) */ 3860786Spspublic int ctldisp; /* Send control chars to screen untranslated */ 3960786Spspublic int force_open; /* Open the file even if not regular file */ 4060786Spspublic int swindow; /* Size of scrolling window */ 4160786Spspublic int jump_sline; /* Screen line of "jump target" */ 42170256Sdelphijpublic long jump_sline_fraction = -1; 43195941Sdelphijpublic long shift_count_fraction = -1; 4460786Spspublic int chopline; /* Truncate displayed lines at screen width */ 4560786Spspublic int no_init; /* Disable sending ti/te termcap strings */ 4689019Spspublic int no_keypad; /* Disable sending ks/ke termcap strings */ 4760786Spspublic int twiddle; /* Show tildes after EOF */ 4860786Spspublic int show_attn; /* Hilite first unread line */ 4963128Spspublic int shift_count; /* Number of positions to shift horizontally */ 5063128Spspublic int status_col; /* Display a status column */ 51128345Stjrpublic int use_lessopen; /* Use the LESSOPEN filter */ 52161475Sdelphijpublic int quit_on_intr; /* Quit on interrupt */ 53173682Sdelphijpublic int follow_mode; /* F cmd Follows file desc or file name? */ 54173682Sdelphijpublic int oldbot; /* Old bottom of screen behavior {{REMOVE}} */ 55251154Sdelphijpublic int opt_use_backslash; /* Use backslash escaping in option parsing */ 5660786Sps#if HILITE_SEARCH 5760786Spspublic int hilite_search; /* Highlight matched search patterns? */ 5860786Sps#endif 5960786Sps 60161475Sdelphijpublic int less_is_more = 0; /* Make compatible with POSIX more */ 61161475Sdelphij 6260786Sps/* 6360786Sps * Long option names. 6460786Sps */ 6560786Spsstatic struct optname a_optname = { "search-skip-screen", NULL }; 6660786Spsstatic struct optname b_optname = { "buffers", NULL }; 6760786Spsstatic struct optname B__optname = { "auto-buffers", NULL }; 6860786Spsstatic struct optname c_optname = { "clear-screen", NULL }; 6960786Spsstatic struct optname d_optname = { "dumb", NULL }; 7060786Sps#if MSDOS_COMPILER 7160786Spsstatic struct optname D__optname = { "color", NULL }; 7260786Sps#endif 7360786Spsstatic struct optname e_optname = { "quit-at-eof", NULL }; 7460786Spsstatic struct optname f_optname = { "force", NULL }; 7560786Spsstatic struct optname F__optname = { "quit-if-one-screen", NULL }; 7660786Sps#if HILITE_SEARCH 7760786Spsstatic struct optname g_optname = { "hilite-search", NULL }; 7860786Sps#endif 7960786Spsstatic struct optname h_optname = { "max-back-scroll", NULL }; 8060786Spsstatic struct optname i_optname = { "ignore-case", NULL }; 8160786Spsstatic struct optname j_optname = { "jump-target", NULL }; 8263128Spsstatic struct optname J__optname = { "status-column", NULL }; 8360786Sps#if USERFILE 8460786Spsstatic struct optname k_optname = { "lesskey-file", NULL }; 8560786Sps#endif 86161475Sdelphijstatic struct optname K__optname = { "quit-on-intr", NULL }; 87128345Stjrstatic struct optname L__optname = { "no-lessopen", NULL }; 8860786Spsstatic struct optname m_optname = { "long-prompt", NULL }; 8960786Spsstatic struct optname n_optname = { "line-numbers", NULL }; 9060786Sps#if LOGFILE 9160786Spsstatic struct optname o_optname = { "log-file", NULL }; 9260786Spsstatic struct optname O__optname = { "LOG-FILE", NULL }; 9360786Sps#endif 9460786Spsstatic struct optname p_optname = { "pattern", NULL }; 9560786Spsstatic struct optname P__optname = { "prompt", NULL }; 9660786Spsstatic struct optname q2_optname = { "silent", NULL }; 9760786Spsstatic struct optname q_optname = { "quiet", &q2_optname }; 9860786Spsstatic struct optname r_optname = { "raw-control-chars", NULL }; 9960786Spsstatic struct optname s_optname = { "squeeze-blank-lines", NULL }; 10060786Spsstatic struct optname S__optname = { "chop-long-lines", NULL }; 10160786Sps#if TAGS 10260786Spsstatic struct optname t_optname = { "tag", NULL }; 10360786Spsstatic struct optname T__optname = { "tag-file", NULL }; 10460786Sps#endif 10560786Spsstatic struct optname u_optname = { "underline-special", NULL }; 10660786Spsstatic struct optname V__optname = { "version", NULL }; 10760786Spsstatic struct optname w_optname = { "hilite-unread", NULL }; 10860786Spsstatic struct optname x_optname = { "tabs", NULL }; 10960786Spsstatic struct optname X__optname = { "no-init", NULL }; 11060786Spsstatic struct optname y_optname = { "max-forw-scroll", NULL }; 11160786Spsstatic struct optname z_optname = { "window", NULL }; 11260786Spsstatic struct optname quote_optname = { "quotes", NULL }; 11360786Spsstatic struct optname tilde_optname = { "tilde", NULL }; 11460786Spsstatic struct optname query_optname = { "help", NULL }; 11563128Spsstatic struct optname pound_optname = { "shift", NULL }; 11689019Spsstatic struct optname keypad_optname = { "no-keypad", NULL }; 117170256Sdelphijstatic struct optname oldbot_optname = { "old-bot", NULL }; 118173682Sdelphijstatic struct optname follow_optname = { "follow-name", NULL }; 119251154Sdelphijstatic struct optname use_backslash_optname = { "use-backslash", NULL }; 12060786Sps 12160786Sps 12260786Sps/* 12360786Sps * Table of all options and their semantics. 12489019Sps * 12589019Sps * For BOOL and TRIPLE options, odesc[0], odesc[1], odesc[2] are 12689019Sps * the description of the option when set to 0, 1 or 2, respectively. 12789019Sps * For NUMBER options, odesc[0] is the prompt to use when entering 12889019Sps * a new value, and odesc[1] is the description, which should contain 12989019Sps * one %d which is replaced by the value of the number. 13089019Sps * For STRING options, odesc[0] is the prompt to use when entering 13189019Sps * a new value, and odesc[1], if not NULL, is the set of characters 13289019Sps * that are valid in the string. 13360786Sps */ 134128345Stjrstatic struct loption option[] = 13560786Sps{ 13660786Sps { 'a', &a_optname, 137221715Sdelphij TRIPLE, OPT_ONPLUS, &how_search, NULL, 138128345Stjr { 139128345Stjr "Search includes displayed screen", 140128345Stjr "Search skips displayed screen", 141221715Sdelphij "Search includes all of displayed screen" 142128345Stjr } 14360786Sps }, 14460786Sps 14560786Sps { 'b', &b_optname, 146128345Stjr NUMBER|INIT_HANDLER, 64, &bufspace, opt_b, 147128345Stjr { 148128345Stjr "Max buffer space per file (K): ", 149128345Stjr "Max buffer space per file: %dK", 150128345Stjr NULL 151128345Stjr } 15260786Sps }, 15360786Sps { 'B', &B__optname, 15460786Sps BOOL, OPT_ON, &autobuf, NULL, 155128345Stjr { 156128345Stjr "Don't automatically allocate buffers", 157128345Stjr "Automatically allocate buffers when needed", 158128345Stjr NULL 159128345Stjr } 16060786Sps }, 16160786Sps { 'c', &c_optname, 16260786Sps TRIPLE, OPT_OFF, &top_scroll, NULL, 163128345Stjr { 164128345Stjr "Repaint by scrolling from bottom of screen", 165170256Sdelphij "Repaint by painting from top of screen", 166128345Stjr "Repaint by painting from top of screen" 167128345Stjr } 16860786Sps }, 16960786Sps { 'd', &d_optname, 17060786Sps BOOL|NO_TOGGLE, OPT_OFF, &know_dumb, NULL, 171128345Stjr { 172128345Stjr "Assume intelligent terminal", 173128345Stjr "Assume dumb terminal", 174128345Stjr NULL 175128345Stjr } 17660786Sps }, 17760786Sps#if MSDOS_COMPILER 17860786Sps { 'D', &D__optname, 17960786Sps STRING|REPAINT|NO_QUERY, 0, NULL, opt_D, 180128345Stjr { 181128345Stjr "color desc: ", 182128345Stjr "Ddknsu0123456789.", 183128345Stjr NULL 184128345Stjr } 18560786Sps }, 18660786Sps#endif 18760786Sps { 'e', &e_optname, 18860786Sps TRIPLE, OPT_OFF, &quit_at_eof, NULL, 189128345Stjr { 190128345Stjr "Don't quit at end-of-file", 191128345Stjr "Quit at end-of-file", 192128345Stjr "Quit immediately at end-of-file" 193128345Stjr } 19460786Sps }, 19560786Sps { 'f', &f_optname, 19660786Sps BOOL, OPT_OFF, &force_open, NULL, 197128345Stjr { 198128345Stjr "Open only regular files", 199128345Stjr "Open even non-regular files", 200128345Stjr NULL 201128345Stjr } 20260786Sps }, 20360786Sps { 'F', &F__optname, 20460786Sps BOOL, OPT_OFF, &quit_if_one_screen, NULL, 205128345Stjr { 206128345Stjr "Don't quit if end-of-file on first screen", 207128345Stjr "Quit if end-of-file on first screen", 208128345Stjr NULL 209128345Stjr } 21060786Sps }, 21160786Sps#if HILITE_SEARCH 21260786Sps { 'g', &g_optname, 21360786Sps TRIPLE|HL_REPAINT, OPT_ONPLUS, &hilite_search, NULL, 214128345Stjr { 215128345Stjr "Don't highlight search matches", 216128345Stjr "Highlight matches for previous search only", 217128345Stjr "Highlight all matches for previous search pattern", 218128345Stjr } 21960786Sps }, 22060786Sps#endif 22160786Sps { 'h', &h_optname, 22260786Sps NUMBER, -1, &back_scroll, NULL, 223128345Stjr { 224128345Stjr "Backwards scroll limit: ", 225128345Stjr "Backwards scroll limit is %d lines", 226128345Stjr NULL 227128345Stjr } 22860786Sps }, 22960786Sps { 'i', &i_optname, 23060786Sps TRIPLE|HL_REPAINT, OPT_OFF, &caseless, opt_i, 231128345Stjr { 232128345Stjr "Case is significant in searches", 233128345Stjr "Ignore case in searches", 234128345Stjr "Ignore case in searches and in patterns" 235128345Stjr } 23660786Sps }, 23760786Sps { 'j', &j_optname, 238170256Sdelphij STRING, 0, NULL, opt_j, 239128345Stjr { 240128345Stjr "Target line: ", 241221715Sdelphij "0123456789.-", 242128345Stjr NULL 243128345Stjr } 24460786Sps }, 24563128Sps { 'J', &J__optname, 24663128Sps BOOL|REPAINT, OPT_OFF, &status_col, NULL, 247128345Stjr { 248128345Stjr "Don't display a status column", 249128345Stjr "Display a status column", 250128345Stjr NULL 251128345Stjr } 25263128Sps }, 25360786Sps#if USERFILE 25460786Sps { 'k', &k_optname, 25560786Sps STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_k, 256128345Stjr { NULL, NULL, NULL } 25760786Sps }, 25860786Sps#endif 259161475Sdelphij { 'K', &K__optname, 260161475Sdelphij BOOL, OPT_OFF, &quit_on_intr, NULL, 261161475Sdelphij { 262161475Sdelphij "Interrupt (ctrl-C) returns to prompt", 263161475Sdelphij "Interrupt (ctrl-C) exits less", 264161475Sdelphij NULL 265161475Sdelphij } 266161475Sdelphij }, 267128345Stjr { 'L', &L__optname, 268128345Stjr BOOL, OPT_ON, &use_lessopen, NULL, 269128345Stjr { 270128345Stjr "Don't use the LESSOPEN filter", 271128345Stjr "Use the LESSOPEN filter", 272128345Stjr NULL 273128345Stjr } 274128345Stjr }, 27560786Sps { 'm', &m_optname, 27660786Sps TRIPLE, OPT_OFF, &pr_type, NULL, 277128345Stjr { 278128345Stjr "Short prompt", 279128345Stjr "Medium prompt", 280128345Stjr "Long prompt" 281128345Stjr } 28260786Sps }, 28360786Sps { 'n', &n_optname, 28460786Sps TRIPLE|REPAINT, OPT_ON, &linenums, NULL, 285128345Stjr { 286128345Stjr "Don't use line numbers", 287128345Stjr "Use line numbers", 288128345Stjr "Constantly display line numbers" 289128345Stjr } 29060786Sps }, 29160786Sps#if LOGFILE 29260786Sps { 'o', &o_optname, 29360786Sps STRING, 0, NULL, opt_o, 294128345Stjr { "log file: ", NULL, NULL } 29560786Sps }, 29660786Sps { 'O', &O__optname, 29760786Sps STRING, 0, NULL, opt__O, 298128345Stjr { "Log file: ", NULL, NULL } 29960786Sps }, 30060786Sps#endif 30160786Sps { 'p', &p_optname, 30260786Sps STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_p, 303128345Stjr { NULL, NULL, NULL } 30460786Sps }, 30560786Sps { 'P', &P__optname, 30660786Sps STRING, 0, NULL, opt__P, 307128345Stjr { "prompt: ", NULL, NULL } 30860786Sps }, 30960786Sps { 'q', &q_optname, 31060786Sps TRIPLE, OPT_OFF, &quiet, NULL, 311128345Stjr { 312128345Stjr "Ring the bell for errors AND at eof/bof", 313128345Stjr "Ring the bell for errors but not at eof/bof", 314128345Stjr "Never ring the bell" 315128345Stjr } 31660786Sps }, 31760786Sps { 'r', &r_optname, 31860786Sps TRIPLE|REPAINT, OPT_OFF, &ctldisp, NULL, 319128345Stjr { 320128345Stjr "Display control characters as ^X", 321128345Stjr "Display control characters directly", 322128345Stjr "Display control characters directly, processing ANSI sequences" 323128345Stjr } 32460786Sps }, 32560786Sps { 's', &s_optname, 32660786Sps BOOL|REPAINT, OPT_OFF, &squeeze, NULL, 327128345Stjr { 328128345Stjr "Display all blank lines", 329128345Stjr "Squeeze multiple blank lines", 330128345Stjr NULL 331128345Stjr } 33260786Sps }, 33360786Sps { 'S', &S__optname, 33460786Sps BOOL|REPAINT, OPT_OFF, &chopline, NULL, 335128345Stjr { 336128345Stjr "Fold long lines", 337128345Stjr "Chop long lines", 338128345Stjr NULL 339128345Stjr } 34060786Sps }, 34160786Sps#if TAGS 34260786Sps { 't', &t_optname, 34360786Sps STRING|NO_QUERY, 0, NULL, opt_t, 344128345Stjr { "tag: ", NULL, NULL } 34560786Sps }, 34660786Sps { 'T', &T__optname, 34760786Sps STRING, 0, NULL, opt__T, 348128345Stjr { "tags file: ", NULL, NULL } 34960786Sps }, 35060786Sps#endif 35160786Sps { 'u', &u_optname, 35260786Sps TRIPLE|REPAINT, OPT_OFF, &bs_mode, NULL, 353128345Stjr { 354128345Stjr "Display underlined text in underline mode", 355128345Stjr "Backspaces cause overstrike", 356128345Stjr "Print backspace as ^H" 357128345Stjr } 35860786Sps }, 35960786Sps { 'V', &V__optname, 36060786Sps NOVAR, 0, NULL, opt__V, 361128345Stjr { NULL, NULL, NULL } 36260786Sps }, 36360786Sps { 'w', &w_optname, 36460786Sps TRIPLE|REPAINT, OPT_OFF, &show_attn, NULL, 365128345Stjr { 366128345Stjr "Don't highlight first unread line", 367128345Stjr "Highlight first unread line after forward-screen", 368128345Stjr "Highlight first unread line after any forward movement", 369128345Stjr } 37060786Sps }, 37160786Sps { 'x', &x_optname, 37289019Sps STRING|REPAINT, 0, NULL, opt_x, 373128345Stjr { 374128345Stjr "Tab stops: ", 375128345Stjr "0123456789,", 376128345Stjr NULL 377128345Stjr } 37860786Sps }, 37960786Sps { 'X', &X__optname, 38060786Sps BOOL|NO_TOGGLE, OPT_OFF, &no_init, NULL, 381128345Stjr { 382128345Stjr "Send init/deinit strings to terminal", 383128345Stjr "Don't use init/deinit strings", 384128345Stjr NULL 385128345Stjr } 38660786Sps }, 38760786Sps { 'y', &y_optname, 38860786Sps NUMBER, -1, &forw_scroll, NULL, 389128345Stjr { 390128345Stjr "Forward scroll limit: ", 391128345Stjr "Forward scroll limit is %d lines", 392128345Stjr NULL 393128345Stjr } 39460786Sps }, 39560786Sps { 'z', &z_optname, 39660786Sps NUMBER, -1, &swindow, NULL, 397128345Stjr { 398128345Stjr "Scroll window size: ", 399128345Stjr "Scroll window size is %d lines", 400128345Stjr NULL 401128345Stjr } 40260786Sps }, 40360786Sps { '"', "e_optname, 40460786Sps STRING, 0, NULL, opt_quote, 405128345Stjr { "quotes: ", NULL, NULL } 40660786Sps }, 40760786Sps { '~', &tilde_optname, 40860786Sps BOOL|REPAINT, OPT_ON, &twiddle, NULL, 409128345Stjr { 410128345Stjr "Don't show tildes after end of file", 411128345Stjr "Show tildes after end of file", 412128345Stjr NULL 413128345Stjr } 41460786Sps }, 41560786Sps { '?', &query_optname, 41660786Sps NOVAR, 0, NULL, opt_query, 417128345Stjr { NULL, NULL, NULL } 41860786Sps }, 41963128Sps { '#', £_optname, 420195941Sdelphij STRING, 0, NULL, opt_shift, 421128345Stjr { 422128345Stjr "Horizontal shift: ", 423195941Sdelphij "0123456789.", 424128345Stjr NULL 425128345Stjr } 42663128Sps }, 427221715Sdelphij { OLETTER_NONE, &keypad_optname, 42889019Sps BOOL|NO_TOGGLE, OPT_OFF, &no_keypad, NULL, 429128345Stjr { 430128345Stjr "Use keypad mode", 431128345Stjr "Don't use keypad mode", 432128345Stjr NULL 433128345Stjr } 43489019Sps }, 435221715Sdelphij { OLETTER_NONE, &oldbot_optname, 436170256Sdelphij BOOL, OPT_OFF, &oldbot, NULL, 437170256Sdelphij { 438170256Sdelphij "Use new bottom of screen behavior", 439170256Sdelphij "Use old bottom of screen behavior", 440170256Sdelphij NULL 441170256Sdelphij } 442170256Sdelphij }, 443221715Sdelphij { OLETTER_NONE, &follow_optname, 444173682Sdelphij BOOL, FOLLOW_DESC, &follow_mode, NULL, 445173682Sdelphij { 446221715Sdelphij "F command follows file descriptor", 447221715Sdelphij "F command follows file name", 448173682Sdelphij NULL 449173682Sdelphij } 450173682Sdelphij }, 451251154Sdelphij { OLETTER_NONE, &use_backslash_optname, 452251154Sdelphij BOOL, OPT_OFF, &opt_use_backslash, NULL, 453251154Sdelphij { 454251154Sdelphij "Use backslash escaping in command line parameters", 455251154Sdelphij "Don't use backslash escaping in command line parameters", 456251154Sdelphij NULL 457251154Sdelphij } 458251154Sdelphij }, 459128345Stjr { '\0', NULL, NOVAR, 0, NULL, NULL, { NULL, NULL, NULL } } 46060786Sps}; 46160786Sps 46260786Sps 46360786Sps/* 46460786Sps * Initialize each option to its default value. 46560786Sps */ 46660786Sps public void 46760786Spsinit_option() 46860786Sps{ 469128345Stjr register struct loption *o; 470161475Sdelphij char *p; 47160786Sps 472161475Sdelphij p = lgetenv("LESS_IS_MORE"); 473161475Sdelphij if (p != NULL && *p != '\0') 474161475Sdelphij less_is_more = 1; 475161475Sdelphij 47660786Sps for (o = option; o->oletter != '\0'; o++) 47760786Sps { 47860786Sps /* 47960786Sps * Set each variable to its default. 48060786Sps */ 48160786Sps if (o->ovar != NULL) 48260786Sps *(o->ovar) = o->odefault; 483128345Stjr if (o->otype & INIT_HANDLER) 484128345Stjr (*(o->ofunc))(INIT, (char *) NULL); 48560786Sps } 48660786Sps} 48760786Sps 48860786Sps/* 48960786Sps * Find an option in the option table, given its option letter. 49060786Sps */ 491128345Stjr public struct loption * 49260786Spsfindopt(c) 49360786Sps int c; 49460786Sps{ 495128345Stjr register struct loption *o; 49660786Sps 49760786Sps for (o = option; o->oletter != '\0'; o++) 49860786Sps { 49960786Sps if (o->oletter == c) 50060786Sps return (o); 501161475Sdelphij if ((o->otype & TRIPLE) && ASCII_TO_UPPER(o->oletter) == c) 50260786Sps return (o); 50360786Sps } 50460786Sps return (NULL); 50560786Sps} 50660786Sps 50760786Sps/* 508128345Stjr * 509128345Stjr */ 510128345Stjr static int 511128345Stjris_optchar(c) 512128345Stjr char c; 513128345Stjr{ 514161475Sdelphij if (ASCII_IS_UPPER(c)) 515128345Stjr return 1; 516161475Sdelphij if (ASCII_IS_LOWER(c)) 517128345Stjr return 1; 518128345Stjr if (c == '-') 519128345Stjr return 1; 520128345Stjr return 0; 521128345Stjr} 522128345Stjr 523128345Stjr/* 52460786Sps * Find an option in the option table, given its option name. 52560786Sps * p_optname is the (possibly partial) name to look for, and 52660786Sps * is updated to point after the matched name. 52760786Sps * p_oname if non-NULL is set to point to the full option name. 52860786Sps */ 529128345Stjr public struct loption * 53060786Spsfindopt_name(p_optname, p_oname, p_err) 53160786Sps char **p_optname; 53260786Sps char **p_oname; 53360786Sps int *p_err; 53460786Sps{ 53560786Sps char *optname = *p_optname; 536128345Stjr register struct loption *o; 53760786Sps register struct optname *oname; 53860786Sps register int len; 53960786Sps int uppercase; 540128345Stjr struct loption *maxo = NULL; 54160786Sps struct optname *maxoname = NULL; 54260786Sps int maxlen = 0; 54360786Sps int ambig = 0; 54460786Sps int exact = 0; 54560786Sps 54660786Sps /* 54760786Sps * Check all options. 54860786Sps */ 54960786Sps for (o = option; o->oletter != '\0'; o++) 55060786Sps { 55160786Sps /* 55260786Sps * Check all names for this option. 55360786Sps */ 55460786Sps for (oname = o->onames; oname != NULL; oname = oname->onext) 55560786Sps { 55660786Sps /* 55760786Sps * Try normal match first (uppercase == 0), 55860786Sps * then, then if it's a TRIPLE option, 55960786Sps * try uppercase match (uppercase == 1). 56060786Sps */ 56160786Sps for (uppercase = 0; uppercase <= 1; uppercase++) 56260786Sps { 56360786Sps len = sprefix(optname, oname->oname, uppercase); 564128345Stjr if (len <= 0 || is_optchar(optname[len])) 565128345Stjr { 566128345Stjr /* 567128345Stjr * We didn't use all of the option name. 568128345Stjr */ 569128345Stjr continue; 570128345Stjr } 57160786Sps if (!exact && len == maxlen) 57260786Sps /* 57360786Sps * Already had a partial match, 57460786Sps * and now there's another one that 57560786Sps * matches the same length. 57660786Sps */ 57760786Sps ambig = 1; 57860786Sps else if (len > maxlen) 57960786Sps { 58060786Sps /* 58160786Sps * Found a better match than 58260786Sps * the one we had. 58360786Sps */ 58460786Sps maxo = o; 58560786Sps maxoname = oname; 58660786Sps maxlen = len; 58760786Sps ambig = 0; 58889019Sps exact = (len == (int)strlen(oname->oname)); 58960786Sps } 59060786Sps if (!(o->otype & TRIPLE)) 59160786Sps break; 59260786Sps } 59360786Sps } 59460786Sps } 59560786Sps if (ambig) 59660786Sps { 59760786Sps /* 59860786Sps * Name matched more than one option. 59960786Sps */ 60060786Sps if (p_err != NULL) 60160786Sps *p_err = OPT_AMBIG; 60260786Sps return (NULL); 60360786Sps } 60460786Sps *p_optname = optname + maxlen; 60560786Sps if (p_oname != NULL) 606128345Stjr *p_oname = maxoname == NULL ? NULL : maxoname->oname; 60760786Sps return (maxo); 60860786Sps} 609