opttbl.c revision 240121
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}} */ 5560786Sps#if HILITE_SEARCH 5660786Spspublic int hilite_search; /* Highlight matched search patterns? */ 5760786Sps#endif 5860786Sps 59161475Sdelphijpublic int less_is_more = 0; /* Make compatible with POSIX more */ 60161475Sdelphij 6160786Sps/* 6260786Sps * Long option names. 6360786Sps */ 6460786Spsstatic struct optname a_optname = { "search-skip-screen", NULL }; 6560786Spsstatic struct optname b_optname = { "buffers", NULL }; 6660786Spsstatic struct optname B__optname = { "auto-buffers", NULL }; 6760786Spsstatic struct optname c_optname = { "clear-screen", NULL }; 6860786Spsstatic struct optname d_optname = { "dumb", NULL }; 6960786Sps#if MSDOS_COMPILER 7060786Spsstatic struct optname D__optname = { "color", NULL }; 7160786Sps#endif 7260786Spsstatic struct optname e_optname = { "quit-at-eof", NULL }; 7360786Spsstatic struct optname f_optname = { "force", NULL }; 7460786Spsstatic struct optname F__optname = { "quit-if-one-screen", NULL }; 7560786Sps#if HILITE_SEARCH 7660786Spsstatic struct optname g_optname = { "hilite-search", NULL }; 7760786Sps#endif 7860786Spsstatic struct optname h_optname = { "max-back-scroll", NULL }; 7960786Spsstatic struct optname i_optname = { "ignore-case", NULL }; 8060786Spsstatic struct optname j_optname = { "jump-target", NULL }; 8163128Spsstatic struct optname J__optname = { "status-column", NULL }; 8260786Sps#if USERFILE 8360786Spsstatic struct optname k_optname = { "lesskey-file", NULL }; 8460786Sps#endif 85161475Sdelphijstatic struct optname K__optname = { "quit-on-intr", NULL }; 86128345Stjrstatic struct optname L__optname = { "no-lessopen", NULL }; 8760786Spsstatic struct optname m_optname = { "long-prompt", NULL }; 8860786Spsstatic struct optname n_optname = { "line-numbers", NULL }; 8960786Sps#if LOGFILE 9060786Spsstatic struct optname o_optname = { "log-file", NULL }; 9160786Spsstatic struct optname O__optname = { "LOG-FILE", NULL }; 9260786Sps#endif 9360786Spsstatic struct optname p_optname = { "pattern", NULL }; 9460786Spsstatic struct optname P__optname = { "prompt", NULL }; 9560786Spsstatic struct optname q2_optname = { "silent", NULL }; 9660786Spsstatic struct optname q_optname = { "quiet", &q2_optname }; 9760786Spsstatic struct optname r_optname = { "raw-control-chars", NULL }; 9860786Spsstatic struct optname s_optname = { "squeeze-blank-lines", NULL }; 9960786Spsstatic struct optname S__optname = { "chop-long-lines", NULL }; 10060786Sps#if TAGS 10160786Spsstatic struct optname t_optname = { "tag", NULL }; 10260786Spsstatic struct optname T__optname = { "tag-file", NULL }; 10360786Sps#endif 10460786Spsstatic struct optname u_optname = { "underline-special", NULL }; 10560786Spsstatic struct optname V__optname = { "version", NULL }; 10660786Spsstatic struct optname w_optname = { "hilite-unread", NULL }; 10760786Spsstatic struct optname x_optname = { "tabs", NULL }; 10860786Spsstatic struct optname X__optname = { "no-init", NULL }; 10960786Spsstatic struct optname y_optname = { "max-forw-scroll", NULL }; 11060786Spsstatic struct optname z_optname = { "window", NULL }; 11160786Spsstatic struct optname quote_optname = { "quotes", NULL }; 11260786Spsstatic struct optname tilde_optname = { "tilde", NULL }; 11360786Spsstatic struct optname query_optname = { "help", NULL }; 11463128Spsstatic struct optname pound_optname = { "shift", NULL }; 11589019Spsstatic struct optname keypad_optname = { "no-keypad", NULL }; 116170256Sdelphijstatic struct optname oldbot_optname = { "old-bot", NULL }; 117173682Sdelphijstatic struct optname follow_optname = { "follow-name", NULL }; 11860786Sps 11960786Sps 12060786Sps/* 12160786Sps * Table of all options and their semantics. 12289019Sps * 12389019Sps * For BOOL and TRIPLE options, odesc[0], odesc[1], odesc[2] are 12489019Sps * the description of the option when set to 0, 1 or 2, respectively. 12589019Sps * For NUMBER options, odesc[0] is the prompt to use when entering 12689019Sps * a new value, and odesc[1] is the description, which should contain 12789019Sps * one %d which is replaced by the value of the number. 12889019Sps * For STRING options, odesc[0] is the prompt to use when entering 12989019Sps * a new value, and odesc[1], if not NULL, is the set of characters 13089019Sps * that are valid in the string. 13160786Sps */ 132128345Stjrstatic struct loption option[] = 13360786Sps{ 13460786Sps { 'a', &a_optname, 135221715Sdelphij TRIPLE, OPT_ONPLUS, &how_search, NULL, 136128345Stjr { 137128345Stjr "Search includes displayed screen", 138128345Stjr "Search skips displayed screen", 139221715Sdelphij "Search includes all of displayed screen" 140128345Stjr } 14160786Sps }, 14260786Sps 14360786Sps { 'b', &b_optname, 144128345Stjr NUMBER|INIT_HANDLER, 64, &bufspace, opt_b, 145128345Stjr { 146128345Stjr "Max buffer space per file (K): ", 147128345Stjr "Max buffer space per file: %dK", 148128345Stjr NULL 149128345Stjr } 15060786Sps }, 15160786Sps { 'B', &B__optname, 15260786Sps BOOL, OPT_ON, &autobuf, NULL, 153128345Stjr { 154128345Stjr "Don't automatically allocate buffers", 155128345Stjr "Automatically allocate buffers when needed", 156128345Stjr NULL 157128345Stjr } 15860786Sps }, 15960786Sps { 'c', &c_optname, 16060786Sps TRIPLE, OPT_OFF, &top_scroll, NULL, 161128345Stjr { 162128345Stjr "Repaint by scrolling from bottom of screen", 163170256Sdelphij "Repaint by painting from top of screen", 164128345Stjr "Repaint by painting from top of screen" 165128345Stjr } 16660786Sps }, 16760786Sps { 'd', &d_optname, 16860786Sps BOOL|NO_TOGGLE, OPT_OFF, &know_dumb, NULL, 169128345Stjr { 170128345Stjr "Assume intelligent terminal", 171128345Stjr "Assume dumb terminal", 172128345Stjr NULL 173128345Stjr } 17460786Sps }, 17560786Sps#if MSDOS_COMPILER 17660786Sps { 'D', &D__optname, 17760786Sps STRING|REPAINT|NO_QUERY, 0, NULL, opt_D, 178128345Stjr { 179128345Stjr "color desc: ", 180128345Stjr "Ddknsu0123456789.", 181128345Stjr NULL 182128345Stjr } 18360786Sps }, 18460786Sps#endif 18560786Sps { 'e', &e_optname, 18660786Sps TRIPLE, OPT_OFF, &quit_at_eof, NULL, 187128345Stjr { 188128345Stjr "Don't quit at end-of-file", 189128345Stjr "Quit at end-of-file", 190128345Stjr "Quit immediately at end-of-file" 191128345Stjr } 19260786Sps }, 19360786Sps { 'f', &f_optname, 19460786Sps BOOL, OPT_OFF, &force_open, NULL, 195128345Stjr { 196128345Stjr "Open only regular files", 197128345Stjr "Open even non-regular files", 198128345Stjr NULL 199128345Stjr } 20060786Sps }, 20160786Sps { 'F', &F__optname, 20260786Sps BOOL, OPT_OFF, &quit_if_one_screen, NULL, 203128345Stjr { 204128345Stjr "Don't quit if end-of-file on first screen", 205128345Stjr "Quit if end-of-file on first screen", 206128345Stjr NULL 207128345Stjr } 20860786Sps }, 20960786Sps#if HILITE_SEARCH 21060786Sps { 'g', &g_optname, 21160786Sps TRIPLE|HL_REPAINT, OPT_ONPLUS, &hilite_search, NULL, 212128345Stjr { 213128345Stjr "Don't highlight search matches", 214128345Stjr "Highlight matches for previous search only", 215128345Stjr "Highlight all matches for previous search pattern", 216128345Stjr } 21760786Sps }, 21860786Sps#endif 21960786Sps { 'h', &h_optname, 22060786Sps NUMBER, -1, &back_scroll, NULL, 221128345Stjr { 222128345Stjr "Backwards scroll limit: ", 223128345Stjr "Backwards scroll limit is %d lines", 224128345Stjr NULL 225128345Stjr } 22660786Sps }, 22760786Sps { 'i', &i_optname, 22860786Sps TRIPLE|HL_REPAINT, OPT_OFF, &caseless, opt_i, 229128345Stjr { 230128345Stjr "Case is significant in searches", 231128345Stjr "Ignore case in searches", 232128345Stjr "Ignore case in searches and in patterns" 233128345Stjr } 23460786Sps }, 23560786Sps { 'j', &j_optname, 236170256Sdelphij STRING, 0, NULL, opt_j, 237128345Stjr { 238128345Stjr "Target line: ", 239221715Sdelphij "0123456789.-", 240128345Stjr NULL 241128345Stjr } 24260786Sps }, 24363128Sps { 'J', &J__optname, 24463128Sps BOOL|REPAINT, OPT_OFF, &status_col, NULL, 245128345Stjr { 246128345Stjr "Don't display a status column", 247128345Stjr "Display a status column", 248128345Stjr NULL 249128345Stjr } 25063128Sps }, 25160786Sps#if USERFILE 25260786Sps { 'k', &k_optname, 25360786Sps STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_k, 254128345Stjr { NULL, NULL, NULL } 25560786Sps }, 25660786Sps#endif 257161475Sdelphij { 'K', &K__optname, 258161475Sdelphij BOOL, OPT_OFF, &quit_on_intr, NULL, 259161475Sdelphij { 260161475Sdelphij "Interrupt (ctrl-C) returns to prompt", 261161475Sdelphij "Interrupt (ctrl-C) exits less", 262161475Sdelphij NULL 263161475Sdelphij } 264161475Sdelphij }, 265128345Stjr { 'L', &L__optname, 266128345Stjr BOOL, OPT_ON, &use_lessopen, NULL, 267128345Stjr { 268128345Stjr "Don't use the LESSOPEN filter", 269128345Stjr "Use the LESSOPEN filter", 270128345Stjr NULL 271128345Stjr } 272128345Stjr }, 27360786Sps { 'm', &m_optname, 27460786Sps TRIPLE, OPT_OFF, &pr_type, NULL, 275128345Stjr { 276128345Stjr "Short prompt", 277128345Stjr "Medium prompt", 278128345Stjr "Long prompt" 279128345Stjr } 28060786Sps }, 28160786Sps { 'n', &n_optname, 28260786Sps TRIPLE|REPAINT, OPT_ON, &linenums, NULL, 283128345Stjr { 284128345Stjr "Don't use line numbers", 285128345Stjr "Use line numbers", 286128345Stjr "Constantly display line numbers" 287128345Stjr } 28860786Sps }, 28960786Sps#if LOGFILE 29060786Sps { 'o', &o_optname, 29160786Sps STRING, 0, NULL, opt_o, 292128345Stjr { "log file: ", NULL, NULL } 29360786Sps }, 29460786Sps { 'O', &O__optname, 29560786Sps STRING, 0, NULL, opt__O, 296128345Stjr { "Log file: ", NULL, NULL } 29760786Sps }, 29860786Sps#endif 29960786Sps { 'p', &p_optname, 30060786Sps STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_p, 301128345Stjr { NULL, NULL, NULL } 30260786Sps }, 30360786Sps { 'P', &P__optname, 30460786Sps STRING, 0, NULL, opt__P, 305128345Stjr { "prompt: ", NULL, NULL } 30660786Sps }, 30760786Sps { 'q', &q_optname, 30860786Sps TRIPLE, OPT_OFF, &quiet, NULL, 309128345Stjr { 310128345Stjr "Ring the bell for errors AND at eof/bof", 311128345Stjr "Ring the bell for errors but not at eof/bof", 312128345Stjr "Never ring the bell" 313128345Stjr } 31460786Sps }, 31560786Sps { 'r', &r_optname, 31660786Sps TRIPLE|REPAINT, OPT_OFF, &ctldisp, NULL, 317128345Stjr { 318128345Stjr "Display control characters as ^X", 319128345Stjr "Display control characters directly", 320128345Stjr "Display control characters directly, processing ANSI sequences" 321128345Stjr } 32260786Sps }, 32360786Sps { 's', &s_optname, 32460786Sps BOOL|REPAINT, OPT_OFF, &squeeze, NULL, 325128345Stjr { 326128345Stjr "Display all blank lines", 327128345Stjr "Squeeze multiple blank lines", 328128345Stjr NULL 329128345Stjr } 33060786Sps }, 33160786Sps { 'S', &S__optname, 33260786Sps BOOL|REPAINT, OPT_OFF, &chopline, NULL, 333128345Stjr { 334128345Stjr "Fold long lines", 335128345Stjr "Chop long lines", 336128345Stjr NULL 337128345Stjr } 33860786Sps }, 33960786Sps#if TAGS 34060786Sps { 't', &t_optname, 34160786Sps STRING|NO_QUERY, 0, NULL, opt_t, 342128345Stjr { "tag: ", NULL, NULL } 34360786Sps }, 34460786Sps { 'T', &T__optname, 34560786Sps STRING, 0, NULL, opt__T, 346128345Stjr { "tags file: ", NULL, NULL } 34760786Sps }, 34860786Sps#endif 34960786Sps { 'u', &u_optname, 35060786Sps TRIPLE|REPAINT, OPT_OFF, &bs_mode, NULL, 351128345Stjr { 352128345Stjr "Display underlined text in underline mode", 353128345Stjr "Backspaces cause overstrike", 354128345Stjr "Print backspace as ^H" 355128345Stjr } 35660786Sps }, 35760786Sps { 'V', &V__optname, 35860786Sps NOVAR, 0, NULL, opt__V, 359128345Stjr { NULL, NULL, NULL } 36060786Sps }, 36160786Sps { 'w', &w_optname, 36260786Sps TRIPLE|REPAINT, OPT_OFF, &show_attn, NULL, 363128345Stjr { 364128345Stjr "Don't highlight first unread line", 365128345Stjr "Highlight first unread line after forward-screen", 366128345Stjr "Highlight first unread line after any forward movement", 367128345Stjr } 36860786Sps }, 36960786Sps { 'x', &x_optname, 37089019Sps STRING|REPAINT, 0, NULL, opt_x, 371128345Stjr { 372128345Stjr "Tab stops: ", 373128345Stjr "0123456789,", 374128345Stjr NULL 375128345Stjr } 37660786Sps }, 37760786Sps { 'X', &X__optname, 37860786Sps BOOL|NO_TOGGLE, OPT_OFF, &no_init, NULL, 379128345Stjr { 380128345Stjr "Send init/deinit strings to terminal", 381128345Stjr "Don't use init/deinit strings", 382128345Stjr NULL 383128345Stjr } 38460786Sps }, 38560786Sps { 'y', &y_optname, 38660786Sps NUMBER, -1, &forw_scroll, NULL, 387128345Stjr { 388128345Stjr "Forward scroll limit: ", 389128345Stjr "Forward scroll limit is %d lines", 390128345Stjr NULL 391128345Stjr } 39260786Sps }, 39360786Sps { 'z', &z_optname, 39460786Sps NUMBER, -1, &swindow, NULL, 395128345Stjr { 396128345Stjr "Scroll window size: ", 397128345Stjr "Scroll window size is %d lines", 398128345Stjr NULL 399128345Stjr } 40060786Sps }, 40160786Sps { '"', "e_optname, 40260786Sps STRING, 0, NULL, opt_quote, 403128345Stjr { "quotes: ", NULL, NULL } 40460786Sps }, 40560786Sps { '~', &tilde_optname, 40660786Sps BOOL|REPAINT, OPT_ON, &twiddle, NULL, 407128345Stjr { 408128345Stjr "Don't show tildes after end of file", 409128345Stjr "Show tildes after end of file", 410128345Stjr NULL 411128345Stjr } 41260786Sps }, 41360786Sps { '?', &query_optname, 41460786Sps NOVAR, 0, NULL, opt_query, 415128345Stjr { NULL, NULL, NULL } 41660786Sps }, 41763128Sps { '#', £_optname, 418195941Sdelphij STRING, 0, NULL, opt_shift, 419128345Stjr { 420128345Stjr "Horizontal shift: ", 421195941Sdelphij "0123456789.", 422128345Stjr NULL 423128345Stjr } 42463128Sps }, 425221715Sdelphij { OLETTER_NONE, &keypad_optname, 42689019Sps BOOL|NO_TOGGLE, OPT_OFF, &no_keypad, NULL, 427128345Stjr { 428128345Stjr "Use keypad mode", 429128345Stjr "Don't use keypad mode", 430128345Stjr NULL 431128345Stjr } 43289019Sps }, 433221715Sdelphij { OLETTER_NONE, &oldbot_optname, 434170256Sdelphij BOOL, OPT_OFF, &oldbot, NULL, 435170256Sdelphij { 436170256Sdelphij "Use new bottom of screen behavior", 437170256Sdelphij "Use old bottom of screen behavior", 438170256Sdelphij NULL 439170256Sdelphij } 440170256Sdelphij }, 441221715Sdelphij { OLETTER_NONE, &follow_optname, 442173682Sdelphij BOOL, FOLLOW_DESC, &follow_mode, NULL, 443173682Sdelphij { 444221715Sdelphij "F command follows file descriptor", 445221715Sdelphij "F command follows file name", 446173682Sdelphij NULL 447173682Sdelphij } 448173682Sdelphij }, 449128345Stjr { '\0', NULL, NOVAR, 0, NULL, NULL, { NULL, NULL, NULL } } 45060786Sps}; 45160786Sps 45260786Sps 45360786Sps/* 45460786Sps * Initialize each option to its default value. 45560786Sps */ 45660786Sps public void 45760786Spsinit_option() 45860786Sps{ 459128345Stjr register struct loption *o; 460161475Sdelphij char *p; 46160786Sps 462161475Sdelphij p = lgetenv("LESS_IS_MORE"); 463161475Sdelphij if (p != NULL && *p != '\0') 464161475Sdelphij less_is_more = 1; 465161475Sdelphij 46660786Sps for (o = option; o->oletter != '\0'; o++) 46760786Sps { 46860786Sps /* 46960786Sps * Set each variable to its default. 47060786Sps */ 47160786Sps if (o->ovar != NULL) 47260786Sps *(o->ovar) = o->odefault; 473128345Stjr if (o->otype & INIT_HANDLER) 474128345Stjr (*(o->ofunc))(INIT, (char *) NULL); 47560786Sps } 47660786Sps} 47760786Sps 47860786Sps/* 47960786Sps * Find an option in the option table, given its option letter. 48060786Sps */ 481128345Stjr public struct loption * 48260786Spsfindopt(c) 48360786Sps int c; 48460786Sps{ 485128345Stjr register struct loption *o; 48660786Sps 48760786Sps for (o = option; o->oletter != '\0'; o++) 48860786Sps { 48960786Sps if (o->oletter == c) 49060786Sps return (o); 491161475Sdelphij if ((o->otype & TRIPLE) && ASCII_TO_UPPER(o->oletter) == c) 49260786Sps return (o); 49360786Sps } 49460786Sps return (NULL); 49560786Sps} 49660786Sps 49760786Sps/* 498128345Stjr * 499128345Stjr */ 500128345Stjr static int 501128345Stjris_optchar(c) 502128345Stjr char c; 503128345Stjr{ 504161475Sdelphij if (ASCII_IS_UPPER(c)) 505128345Stjr return 1; 506161475Sdelphij if (ASCII_IS_LOWER(c)) 507128345Stjr return 1; 508128345Stjr if (c == '-') 509128345Stjr return 1; 510128345Stjr return 0; 511128345Stjr} 512128345Stjr 513128345Stjr/* 51460786Sps * Find an option in the option table, given its option name. 51560786Sps * p_optname is the (possibly partial) name to look for, and 51660786Sps * is updated to point after the matched name. 51760786Sps * p_oname if non-NULL is set to point to the full option name. 51860786Sps */ 519128345Stjr public struct loption * 52060786Spsfindopt_name(p_optname, p_oname, p_err) 52160786Sps char **p_optname; 52260786Sps char **p_oname; 52360786Sps int *p_err; 52460786Sps{ 52560786Sps char *optname = *p_optname; 526128345Stjr register struct loption *o; 52760786Sps register struct optname *oname; 52860786Sps register int len; 52960786Sps int uppercase; 530128345Stjr struct loption *maxo = NULL; 53160786Sps struct optname *maxoname = NULL; 53260786Sps int maxlen = 0; 53360786Sps int ambig = 0; 53460786Sps int exact = 0; 53560786Sps 53660786Sps /* 53760786Sps * Check all options. 53860786Sps */ 53960786Sps for (o = option; o->oletter != '\0'; o++) 54060786Sps { 54160786Sps /* 54260786Sps * Check all names for this option. 54360786Sps */ 54460786Sps for (oname = o->onames; oname != NULL; oname = oname->onext) 54560786Sps { 54660786Sps /* 54760786Sps * Try normal match first (uppercase == 0), 54860786Sps * then, then if it's a TRIPLE option, 54960786Sps * try uppercase match (uppercase == 1). 55060786Sps */ 55160786Sps for (uppercase = 0; uppercase <= 1; uppercase++) 55260786Sps { 55360786Sps len = sprefix(optname, oname->oname, uppercase); 554128345Stjr if (len <= 0 || is_optchar(optname[len])) 555128345Stjr { 556128345Stjr /* 557128345Stjr * We didn't use all of the option name. 558128345Stjr */ 559128345Stjr continue; 560128345Stjr } 56160786Sps if (!exact && len == maxlen) 56260786Sps /* 56360786Sps * Already had a partial match, 56460786Sps * and now there's another one that 56560786Sps * matches the same length. 56660786Sps */ 56760786Sps ambig = 1; 56860786Sps else if (len > maxlen) 56960786Sps { 57060786Sps /* 57160786Sps * Found a better match than 57260786Sps * the one we had. 57360786Sps */ 57460786Sps maxo = o; 57560786Sps maxoname = oname; 57660786Sps maxlen = len; 57760786Sps ambig = 0; 57889019Sps exact = (len == (int)strlen(oname->oname)); 57960786Sps } 58060786Sps if (!(o->otype & TRIPLE)) 58160786Sps break; 58260786Sps } 58360786Sps } 58460786Sps } 58560786Sps if (ambig) 58660786Sps { 58760786Sps /* 58860786Sps * Name matched more than one option. 58960786Sps */ 59060786Sps if (p_err != NULL) 59160786Sps *p_err = OPT_AMBIG; 59260786Sps return (NULL); 59360786Sps } 59460786Sps *p_optname = optname + maxlen; 59560786Sps if (p_oname != NULL) 596128345Stjr *p_oname = maxoname == NULL ? NULL : maxoname->oname; 59760786Sps return (maxo); 59860786Sps} 599