/* * Copyright (C) 1984-2012 Mark Nudelman * * You may distribute under the terms of either the GNU General Public * License or the Less License, as specified in the README file. * * For more information, see the README file. */ /* * The option table. */ #include "less.h" #include "option.h" /* * Variables controlled by command line options. */ public int quiet; /* Should we suppress the audible bell? */ public int how_search; /* Where should forward searches start? */ public int top_scroll; /* Repaint screen from top? (alternative is scroll from bottom) */ public int pr_type; /* Type of prompt (short, medium, long) */ public int bs_mode; /* How to process backspaces */ public int know_dumb; /* Don't complain about dumb terminals */ public int quit_at_eof; /* Quit after hitting end of file twice */ public int quit_if_one_screen; /* Quit if EOF on first screen */ public int squeeze; /* Squeeze multiple blank lines into one */ public int tabstop; /* Tab settings */ public int back_scroll; /* Repaint screen on backwards movement */ public int forw_scroll; /* Repaint screen on forward movement */ public int caseless; /* Do "caseless" searches */ public int linenums; /* Use line numbers */ public int autobuf; /* Automatically allocate buffers as needed */ public int bufspace; /* Max buffer space per file (K) */ public int ctldisp; /* Send control chars to screen untranslated */ public int force_open; /* Open the file even if not regular file */ public int swindow; /* Size of scrolling window */ public int jump_sline; /* Screen line of "jump target" */ public long jump_sline_fraction = -1; public long shift_count_fraction = -1; public int chopline; /* Truncate displayed lines at screen width */ public int no_init; /* Disable sending ti/te termcap strings */ public int no_keypad; /* Disable sending ks/ke termcap strings */ public int twiddle; /* Show tildes after EOF */ public int show_attn; /* Hilite first unread line */ public int shift_count; /* Number of positions to shift horizontally */ public int status_col; /* Display a status column */ public int use_lessopen; /* Use the LESSOPEN filter */ public int quit_on_intr; /* Quit on interrupt */ public int follow_mode; /* F cmd Follows file desc or file name? */ public int oldbot; /* Old bottom of screen behavior {{REMOVE}} */ public int opt_use_backslash; /* Use backslash escaping in option parsing */ #if HILITE_SEARCH public int hilite_search; /* Highlight matched search patterns? */ #endif public int less_is_more = 0; /* Make compatible with POSIX more */ /* * Long option names. */ #if GNU_OPTIONS static struct optname a_optname = { "search-skip-screen", NULL }; static struct optname b_optname = { "buffers", NULL }; static struct optname B__optname = { "auto-buffers", NULL }; static struct optname c_optname = { "clear-screen", NULL }; static struct optname d_optname = { "dumb", NULL }; #if MSDOS_COMPILER static struct optname D__optname = { "color", NULL }; #endif static struct optname e_optname = { "quit-at-eof", NULL }; static struct optname f_optname = { "force", NULL }; static struct optname F__optname = { "quit-if-one-screen", NULL }; #if HILITE_SEARCH static struct optname g_optname = { "hilite-search", NULL }; #endif static struct optname h_optname = { "max-back-scroll", NULL }; static struct optname i_optname = { "ignore-case", NULL }; static struct optname j_optname = { "jump-target", NULL }; static struct optname J__optname = { "status-column", NULL }; #if USERFILE static struct optname k_optname = { "lesskey-file", NULL }; #endif static struct optname K__optname = { "quit-on-intr", NULL }; static struct optname L__optname = { "no-lessopen", NULL }; static struct optname m_optname = { "long-prompt", NULL }; static struct optname n_optname = { "line-numbers", NULL }; #if LOGFILE static struct optname o_optname = { "log-file", NULL }; static struct optname O__optname = { "LOG-FILE", NULL }; #endif static struct optname p_optname = { "pattern", NULL }; static struct optname P__optname = { "prompt", NULL }; static struct optname q2_optname = { "silent", NULL }; static struct optname q_optname = { "quiet", &q2_optname }; static struct optname r_optname = { "raw-control-chars", NULL }; static struct optname s_optname = { "squeeze-blank-lines", NULL }; static struct optname S__optname = { "chop-long-lines", NULL }; #if TAGS static struct optname t_optname = { "tag", NULL }; static struct optname T__optname = { "tag-file", NULL }; #endif static struct optname u_optname = { "underline-special", NULL }; static struct optname V__optname = { "version", NULL }; static struct optname w_optname = { "hilite-unread", NULL }; static struct optname x_optname = { "tabs", NULL }; static struct optname X__optname = { "no-init", NULL }; static struct optname y_optname = { "max-forw-scroll", NULL }; static struct optname z_optname = { "window", NULL }; static struct optname quote_optname = { "quotes", NULL }; static struct optname tilde_optname = { "tilde", NULL }; static struct optname query_optname = { "help", NULL }; static struct optname pound_optname = { "shift", NULL }; static struct optname keypad_optname = { "no-keypad", NULL }; static struct optname oldbot_optname = { "old-bot", NULL }; static struct optname follow_optname = { "follow-name", NULL }; static struct optname use_backslash_optname = { "use-backslash", NULL }; #else static struct optname fake_optname = { "fake", NULL }; #define a_optname fake_optname #define b_optname fake_optname #define B__optname fake_optname #define c_optname fake_optname #define d_optname fake_optname #if MSDOS_COMPILER #define D__optname fake_optname #endif #define e_optname fake_optname #define f_optname fake_optname #define F__optname fake_optname #if HILITE_SEARCH #define g_optname fake_optname #endif #define h_optname fake_optname #define i_optname fake_optname #define j_optname fake_optname #define J__optname fake_optname #if USERFILE #define k_optname fake_optname #endif #define K__optname fake_optname #define L__optname fake_optname #define m_optname fake_optname #define n_optname fake_optname #if LOGFILE #define o_optname fake_optname #define O__optname fake_optname #endif #define p_optname fake_optname #define P__optname fake_optname #define q2_optname fake_optname #define q_optname fake_optname #define r_optname fake_optname #define s_optname fake_optname #define S__optname fake_optname #if TAGS #define t_optname fake_optname #define T__optname fake_optname #endif #define u_optname fake_optname #define V__optname fake_optname #define w_optname fake_optname #define x_optname fake_optname #define X__optname fake_optname #define y_optname fake_optname #define z_optname fake_optname #define quote_optname fake_optname #define tilde_optname fake_optname #define query_optname fake_optname #define pound_optname fake_optname #define keypad_optname fake_optname #define oldbot_optname fake_optname #define follow_optname fake_optname #define use_backslash_optname fake_optname #endif /* * Table of all options and their semantics. * * For BOOL and TRIPLE options, odesc[0], odesc[1], odesc[2] are * the description of the option when set to 0, 1 or 2, respectively. * For NUMBER options, odesc[0] is the prompt to use when entering * a new value, and odesc[1] is the description, which should contain * one %d which is replaced by the value of the number. * For STRING options, odesc[0] is the prompt to use when entering * a new value, and odesc[1], if not NULL, is the set of characters * that are valid in the string. */ static struct loption option[] = { { 'a', &a_optname, TRIPLE, OPT_ONPLUS, &how_search, NULL, { "Search includes displayed screen", "Search skips displayed screen", "Search includes all of displayed screen" } }, { 'b', &b_optname, NUMBER|INIT_HANDLER, 64, &bufspace, opt_b, { "Max buffer space per file (K): ", "Max buffer space per file: %dK", NULL } }, { 'B', &B__optname, BOOL, OPT_ON, &autobuf, NULL, { "Don't automatically allocate buffers", "Automatically allocate buffers when needed", NULL } }, { 'c', &c_optname, TRIPLE, OPT_ON, &top_scroll, NULL, { "Repaint by scrolling from bottom of screen", "Repaint by painting from top of screen", "Repaint by painting from top of screen" } }, { 'd', &d_optname, BOOL|NO_TOGGLE, OPT_OFF, &know_dumb, NULL, { "Assume intelligent terminal", "Assume dumb terminal", NULL } }, #if MSDOS_COMPILER { 'D', &D__optname, STRING|REPAINT|NO_QUERY, 0, NULL, opt_D, { "color desc: ", "Ddknsu0123456789.", NULL } }, #endif { 'e', &e_optname, TRIPLE, OPT_OFF, &quit_at_eof, NULL, { "Don't quit at end-of-file", "Quit at end-of-file", "Quit immediately at end-of-file" } }, { 'f', &f_optname, BOOL, OPT_OFF, &force_open, NULL, { "Open only regular files", "Open even non-regular files", NULL } }, { 'F', &F__optname, BOOL, OPT_OFF, &quit_if_one_screen, NULL, { "Don't quit if end-of-file on first screen", "Quit if end-of-file on first screen", NULL } }, #if HILITE_SEARCH { 'g', &g_optname, TRIPLE|HL_REPAINT, OPT_ONPLUS, &hilite_search, NULL, { "Don't highlight search matches", "Highlight matches for previous search only", "Highlight all matches for previous search pattern", } }, #endif { 'h', &h_optname, NUMBER, -1, &back_scroll, NULL, { "Backwards scroll limit: ", "Backwards scroll limit is %d lines", NULL } }, { 'i', &i_optname, TRIPLE|HL_REPAINT, OPT_OFF, &caseless, opt_i, { "Case is significant in searches", "Ignore case in searches", "Ignore case in searches and in patterns" } }, { 'j', &j_optname, STRING, 0, NULL, opt_j, { "Target line: ", "0123456789.-", NULL } }, { 'J', &J__optname, BOOL|REPAINT, OPT_OFF, &status_col, NULL, { "Don't display a status column", "Display a status column", NULL } }, #if USERFILE { 'k', &k_optname, STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_k, { NULL, NULL, NULL } }, #endif { 'K', &K__optname, BOOL, OPT_OFF, &quit_on_intr, NULL, { "Interrupt (ctrl-C) returns to prompt", "Interrupt (ctrl-C) exits less", NULL } }, { 'L', &L__optname, BOOL, OPT_ON, &use_lessopen, NULL, { "Don't use the LESSOPEN filter", "Use the LESSOPEN filter", NULL } }, { 'm', &m_optname, TRIPLE, OPT_OFF, &pr_type, NULL, { "Short prompt", "Medium prompt", "Long prompt" } }, { 'n', &n_optname, TRIPLE|REPAINT, OPT_ON, &linenums, NULL, { "Don't use line numbers", "Use line numbers", "Constantly display line numbers" } }, #if LOGFILE { 'o', &o_optname, STRING, 0, NULL, opt_o, { "log file: ", NULL, NULL } }, { 'O', &O__optname, STRING, 0, NULL, opt__O, { "Log file: ", NULL, NULL } }, #endif { 'p', &p_optname, STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_p, { NULL, NULL, NULL } }, { 'P', &P__optname, STRING, 0, NULL, opt__P, { "prompt: ", NULL, NULL } }, { 'q', &q_optname, TRIPLE, OPT_OFF, &quiet, NULL, { "Ring the bell for errors AND at eof/bof", "Ring the bell for errors but not at eof/bof", "Never ring the bell" } }, { 'r', &r_optname, TRIPLE|REPAINT, OPT_OFF, &ctldisp, NULL, { "Display control characters as ^X", "Display control characters directly", "Display control characters directly, processing ANSI sequences" } }, { 's', &s_optname, BOOL|REPAINT, OPT_OFF, &squeeze, NULL, { "Display all blank lines", "Squeeze multiple blank lines", NULL } }, { 'S', &S__optname, BOOL|REPAINT, OPT_OFF, &chopline, NULL, { "Fold long lines", "Chop long lines", NULL } }, #if TAGS { 't', &t_optname, STRING|NO_QUERY, 0, NULL, opt_t, { "tag: ", NULL, NULL } }, { 'T', &T__optname, STRING, 0, NULL, opt__T, { "tags file: ", NULL, NULL } }, #endif { 'u', &u_optname, TRIPLE|REPAINT, OPT_OFF, &bs_mode, NULL, { "Display underlined text in underline mode", "Backspaces cause overstrike", "Print backspace as ^H" } }, { 'V', &V__optname, NOVAR, 0, NULL, opt__V, { NULL, NULL, NULL } }, { 'w', &w_optname, TRIPLE|REPAINT, OPT_OFF, &show_attn, NULL, { "Don't highlight first unread line", "Highlight first unread line after forward-screen", "Highlight first unread line after any forward movement", } }, { 'x', &x_optname, STRING|REPAINT, 0, NULL, opt_x, { "Tab stops: ", "0123456789,", NULL } }, { 'X', &X__optname, BOOL|NO_TOGGLE, OPT_OFF, &no_init, NULL, { "Send init/deinit strings to terminal", "Don't use init/deinit strings", NULL } }, { 'y', &y_optname, NUMBER, -1, &forw_scroll, NULL, { "Forward scroll limit: ", "Forward scroll limit is %d lines", NULL } }, { 'z', &z_optname, NUMBER, -1, &swindow, NULL, { "Scroll window size: ", "Scroll window size is %d lines", NULL } }, { '"', "e_optname, STRING, 0, NULL, opt_quote, { "quotes: ", NULL, NULL } }, { '~', &tilde_optname, BOOL|REPAINT, OPT_ON, &twiddle, NULL, { "Don't show tildes after end of file", "Show tildes after end of file", NULL } }, { '?', &query_optname, NOVAR, 0, NULL, opt_query, { NULL, NULL, NULL } }, { '#', £_optname, STRING, 0, NULL, opt_shift, { "Horizontal shift: ", "0123456789.", NULL } }, { OLETTER_NONE, &keypad_optname, BOOL|NO_TOGGLE, OPT_OFF, &no_keypad, NULL, { "Use keypad mode", "Don't use keypad mode", NULL } }, { OLETTER_NONE, &oldbot_optname, BOOL, OPT_OFF, &oldbot, NULL, { "Use new bottom of screen behavior", "Use old bottom of screen behavior", NULL } }, { OLETTER_NONE, &follow_optname, BOOL, FOLLOW_DESC, &follow_mode, NULL, { "F command follows file descriptor", "F command follows file name", NULL } }, { OLETTER_NONE, &use_backslash_optname, BOOL, OPT_OFF, &opt_use_backslash, NULL, { "Use backslash escaping in command line parameters", "Don't use backslash escaping in command line parameters", NULL } }, { '\0', NULL, NOVAR, 0, NULL, NULL, { NULL, NULL, NULL } } }; /* * Initialize each option to its default value. */ public void init_option() { register struct loption *o; char *p; p = lgetenv("LESS_IS_MORE"); if (p != NULL && *p != '\0') less_is_more = 1; for (o = option; o->oletter != '\0'; o++) { /* * Set each variable to its default. */ if (o->ovar != NULL) *(o->ovar) = o->odefault; if (o->otype & INIT_HANDLER) (*(o->ofunc))(INIT, (char *) NULL); } } /* * Find an option in the option table, given its option letter. */ public struct loption * findopt(c) int c; { register struct loption *o; for (o = option; o->oletter != '\0'; o++) { if (o->oletter == c) return (o); if ((o->otype & TRIPLE) && ASCII_TO_UPPER(o->oletter) == c) return (o); } return (NULL); } /* * */ static int is_optchar(c) char c; { if (ASCII_IS_UPPER(c)) return 1; if (ASCII_IS_LOWER(c)) return 1; if (c == '-') return 1; return 0; } #if GNU_OPTIONS /* * Find an option in the option table, given its option name. * p_optname is the (possibly partial) name to look for, and * is updated to point after the matched name. * p_oname if non-NULL is set to point to the full option name. */ public struct loption * findopt_name(p_optname, p_oname, p_err) char **p_optname; char **p_oname; int *p_err; { char *optname = *p_optname; register struct loption *o; register struct optname *oname; register int len; int uppercase; struct loption *maxo = NULL; struct optname *maxoname = NULL; int maxlen = 0; int ambig = 0; int exact = 0; /* * Check all options. */ for (o = option; o->oletter != '\0'; o++) { /* * Check all names for this option. */ for (oname = o->onames; oname != NULL; oname = oname->onext) { /* * Try normal match first (uppercase == 0), * then, then if it's a TRIPLE option, * try uppercase match (uppercase == 1). */ for (uppercase = 0; uppercase <= 1; uppercase++) { len = sprefix(optname, oname->oname, uppercase); if (len <= 0 || is_optchar(optname[len])) { /* * We didn't use all of the option name. */ continue; } if (!exact && len == maxlen) /* * Already had a partial match, * and now there's another one that * matches the same length. */ ambig = 1; else if (len > maxlen) { /* * Found a better match than * the one we had. */ maxo = o; maxoname = oname; maxlen = len; ambig = 0; exact = (len == (int)strlen(oname->oname)); } if (!(o->otype & TRIPLE)) break; } } } if (ambig) { /* * Name matched more than one option. */ if (p_err != NULL) *p_err = OPT_AMBIG; return (NULL); } *p_optname = optname + maxlen; if (p_oname != NULL) *p_oname = maxoname == NULL ? NULL : maxoname->oname; return (maxo); } #endif