[dragonfly.git] / contrib / less / opttbl.c

/*
 * Copyright (C) 1984-2009  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 about less, or for information on how to 
 * contact the author, 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}} */
#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.
 */
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 };


/*
 * 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,
		BOOL, OPT_OFF, &how_search, NULL,
		{
			"Search includes displayed screen",
			"Search skips displayed screen",
			NULL
		}
	},

	{ '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_OFF, &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', NULL,
		STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_l,
		{ NULL, NULL, 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
		}
	},
	{ '"', &quote_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 }
	},
	{ '#', &pound_optname,
		STRING, 0, NULL, opt_shift,
		{
			"Horizontal shift: ",
			"0123456789.",
			NULL
		}
	},
	{ '.', &keypad_optname,
		BOOL|NO_TOGGLE, OPT_OFF, &no_keypad, NULL,
		{
			"Use keypad mode",
			"Don't use keypad mode",
			NULL
		}
	},
	{ '.', &oldbot_optname,
		BOOL, OPT_OFF, &oldbot, NULL,
		{
			"Use new bottom of screen behavior",
			"Use old bottom of screen behavior",
			NULL
		}
	},
	{ '.', &follow_optname,
		BOOL, FOLLOW_DESC, &follow_mode, NULL,
		{
			"F command Follows file descriptor",
			"F command Follows file name",
			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;
}

/*
 * 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);
}
Commit	Line	Data
131ccf9c	1	/*
a9adbba3	2	* Copyright (C) 1984-2009 Mark Nudelman
131ccf9c PA	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 about less, or for information on how to
	8	* contact the author, see the README file.
	9	*/
	10
	11
	12	/*
	13	* The option table.
	14	*/
	15
	16	#include "less.h"
	17	#include "option.h"
	18
	19	/*
	20	* Variables controlled by command line options.
	21	*/
	22	public int quiet; /* Should we suppress the audible bell? */
	23	public int how_search; /* Where should forward searches start? */
	24	public int top_scroll; /* Repaint screen from top?
	25	(alternative is scroll from bottom) */
	26	public int pr_type; /* Type of prompt (short, medium, long) */
	27	public int bs_mode; /* How to process backspaces */
	28	public int know_dumb; /* Don't complain about dumb terminals */
	29	public int quit_at_eof; /* Quit after hitting end of file twice */
	30	public int quit_if_one_screen; /* Quit if EOF on first screen */
	31	public int squeeze; /* Squeeze multiple blank lines into one */
	32	public int tabstop; /* Tab settings */
	33	public int back_scroll; /* Repaint screen on backwards movement */
	34	public int forw_scroll; /* Repaint screen on forward movement */
	35	public int caseless; /* Do "caseless" searches */
	36	public int linenums; /* Use line numbers */
	37	public int autobuf; /* Automatically allocate buffers as needed */
	38	public int bufspace; /* Max buffer space per file (K) */
	39	public int ctldisp; /* Send control chars to screen untranslated */
	40	public int force_open; /* Open the file even if not regular file */
	41	public int swindow; /* Size of scrolling window */
	42	public int jump_sline; /* Screen line of "jump target" */
	43	public long jump_sline_fraction = -1;
a9adbba3	44	public long shift_count_fraction = -1;
131ccf9c PA	45	public int chopline; /* Truncate displayed lines at screen width */
	46	public int no_init; /* Disable sending ti/te termcap strings */
	47	public int no_keypad; /* Disable sending ks/ke termcap strings */
	48	public int twiddle; /* Show tildes after EOF */
	49	public int show_attn; /* Hilite first unread line */
	50	public int shift_count; /* Number of positions to shift horizontally */
	51	public int status_col; /* Display a status column */
	52	public int use_lessopen; /* Use the LESSOPEN filter */
	53	public int quit_on_intr; /* Quit on interrupt */
3336a202 PA	54	public int follow_mode; /* F cmd Follows file desc or file name? */
3336a202 PA	55	public int oldbot; /* Old bottom of screen behavior {{REMOVE}} */
131ccf9c PA	56	#if HILITE_SEARCH
	57	public int hilite_search; /* Highlight matched search patterns? */
	58	#endif
	59
	60	public int less_is_more = 0; /* Make compatible with POSIX more */
	61
	62	/*
	63	* Long option names.
	64	*/
	65	static struct optname a_optname = { "search-skip-screen", NULL };
	66	static struct optname b_optname = { "buffers", NULL };
	67	static struct optname B__optname = { "auto-buffers", NULL };
	68	static struct optname c_optname = { "clear-screen", NULL };
	69	static struct optname d_optname = { "dumb", NULL };
	70	#if MSDOS_COMPILER
	71	static struct optname D__optname = { "color", NULL };
	72	#endif
	73	static struct optname e_optname = { "quit-at-eof", NULL };
	74	static struct optname f_optname = { "force", NULL };
	75	static struct optname F__optname = { "quit-if-one-screen", NULL };
	76	#if HILITE_SEARCH
	77	static struct optname g_optname = { "hilite-search", NULL };
	78	#endif
	79	static struct optname h_optname = { "max-back-scroll", NULL };
	80	static struct optname i_optname = { "ignore-case", NULL };
	81	static struct optname j_optname = { "jump-target", NULL };
	82	static struct optname J__optname = { "status-column", NULL };
	83	#if USERFILE
	84	static struct optname k_optname = { "lesskey-file", NULL };
	85	#endif
	86	static struct optname K__optname = { "quit-on-intr", NULL };
	87	static struct optname L__optname = { "no-lessopen", NULL };
	88	static struct optname m_optname = { "long-prompt", NULL };
	89	static struct optname n_optname = { "line-numbers", NULL };
	90	#if LOGFILE
	91	static struct optname o_optname = { "log-file", NULL };
	92	static struct optname O__optname = { "LOG-FILE", NULL };
	93	#endif
	94	static struct optname p_optname = { "pattern", NULL };
	95	static struct optname P__optname = { "prompt", NULL };
	96	static struct optname q2_optname = { "silent", NULL };
	97	static struct optname q_optname = { "quiet", &q2_optname };
	98	static struct optname r_optname = { "raw-control-chars", NULL };
	99	static struct optname s_optname = { "squeeze-blank-lines", NULL };
	100	static struct optname S__optname = { "chop-long-lines", NULL };
	101	#if TAGS
	102	static struct optname t_optname = { "tag", NULL };
	103	static struct optname T__optname = { "tag-file", NULL };
	104	#endif
	105	static struct optname u_optname = { "underline-special", NULL };
	106	static struct optname V__optname = { "version", NULL };
	107	static struct optname w_optname = { "hilite-unread", NULL };
	108	static struct optname x_optname = { "tabs", NULL };
	109	static struct optname X__optname = { "no-init", NULL };
	110	static struct optname y_optname = { "max-forw-scroll", NULL };
	111	static struct optname z_optname = { "window", NULL };
	112	static struct optname quote_optname = { "quotes", NULL };
	113	static struct optname tilde_optname = { "tilde", NULL };
	114	static struct optname query_optname = { "help", NULL };
	115	static struct optname pound_optname = { "shift", NULL };
	116	static struct optname keypad_optname = { "no-keypad", NULL };
	117	static struct optname oldbot_optname = { "old-bot", NULL };
3336a202	118	static struct optname follow_optname = { "follow-name", NULL };
131ccf9c PA	119
	120
	121	/*
	122	* Table of all options and their semantics.
	123	*
	124	* For BOOL and TRIPLE options, odesc[0], odesc[1], odesc[2] are
	125	* the description of the option when set to 0, 1 or 2, respectively.
	126	* For NUMBER options, odesc[0] is the prompt to use when entering
	127	* a new value, and odesc[1] is the description, which should contain
	128	* one %d which is replaced by the value of the number.
	129	* For STRING options, odesc[0] is the prompt to use when entering
	130	* a new value, and odesc[1], if not NULL, is the set of characters
	131	* that are valid in the string.
	132	*/
	133	static struct loption option[] =
	134	{
	135	{ 'a', &a_optname,
	136	BOOL, OPT_OFF, &how_search, NULL,
	137	{
	138	"Search includes displayed screen",
	139	"Search skips displayed screen",
	140	NULL
	141	}
	142	},
	143
	144	{ 'b', &b_optname,
	145	NUMBER\|INIT_HANDLER, 64, &bufspace, opt_b,
	146	{
	147	"Max buffer space per file (K): ",
	148	"Max buffer space per file: %dK",
	149	NULL
	150	}
	151	},
	152	{ 'B', &B__optname,
	153	BOOL, OPT_ON, &autobuf, NULL,
	154	{
	155	"Don't automatically allocate buffers",
	156	"Automatically allocate buffers when needed",
	157	NULL
	158	}
	159	},
	160	{ 'c', &c_optname,
	161	TRIPLE, OPT_OFF, &top_scroll, NULL,
	162	{
	163	"Repaint by scrolling from bottom of screen",
	164	"Repaint by painting from top of screen",
	165	"Repaint by painting from top of screen"
	166	}
	167	},
	168	{ 'd', &d_optname,
	169	BOOL\|NO_TOGGLE, OPT_OFF, &know_dumb, NULL,
	170	{
	171	"Assume intelligent terminal",
	172	"Assume dumb terminal",
	173	NULL
	174	}
	175	},
	176	#if MSDOS_COMPILER
	177	{ 'D', &D__optname,
	178	STRING\|REPAINT\|NO_QUERY, 0, NULL, opt_D,
	179	{
	180	"color desc: ",
	181	"Ddknsu0123456789.",
	182	NULL
183	}
184	},
185	#endif
186	{ 'e', &e_optname,
187	TRIPLE, OPT_OFF, &quit_at_eof, NULL,
188	{
189	"Don't quit at end-of-file",
190	"Quit at end-of-file",
191	"Quit immediately at end-of-file"
192	}
193	},
194	{ 'f', &f_optname,
195	BOOL, OPT_OFF, &force_open, NULL,
196	{
197	"Open only regular files",
198	"Open even non-regular files",
199	NULL
200	}
201	},
202	{ 'F', &F__optname,
203	BOOL, OPT_OFF, &quit_if_one_screen, NULL,
204	{
205	"Don't quit if end-of-file on first screen",
206	"Quit if end-of-file on first screen",
207	NULL
208	}
209	},
210	#if HILITE_SEARCH
211	{ 'g', &g_optname,
212	TRIPLE\|HL_REPAINT, OPT_ONPLUS, &hilite_search, NULL,
213	{
214	"Don't highlight search matches",
215	"Highlight matches for previous search only",
216	"Highlight all matches for previous search pattern",
217	}
218	},
219	#endif
220	{ 'h', &h_optname,
221	NUMBER, -1, &back_scroll, NULL,
222	{
223	"Backwards scroll limit: ",
224	"Backwards scroll limit is %d lines",
225	NULL
226	}
227	},
228	{ 'i', &i_optname,
229	TRIPLE\|HL_REPAINT, OPT_OFF, &caseless, opt_i,
230	{
231	"Case is significant in searches",
232	"Ignore case in searches",
233	"Ignore case in searches and in patterns"
234	}
235	},
236	{ 'j', &j_optname,
237	STRING, 0, NULL, opt_j,
238	{
239	"Target line: ",
240	"0123456789.",
241	NULL
242	}
243	},
244	{ 'J', &J__optname,
245	BOOL\|REPAINT, OPT_OFF, &status_col, NULL,
246	{
247	"Don't display a status column",
248	"Display a status column",
249	NULL
250	}
251	},
252	#if USERFILE
253	{ 'k', &k_optname,
254	STRING\|NO_TOGGLE\|NO_QUERY, 0, NULL, opt_k,
255	{ NULL, NULL, NULL }
256	},
257	#endif
258	{ 'K', &K__optname,
259	BOOL, OPT_OFF, &quit_on_intr, NULL,
260	{
261	"Interrupt (ctrl-C) returns to prompt",
262	"Interrupt (ctrl-C) exits less",
263	NULL
264	}
265	},
266	{ 'l', NULL,
267	STRING\|NO_TOGGLE\|NO_QUERY, 0, NULL, opt_l,
268	{ NULL, NULL, NULL }
269	},
270	{ 'L', &L__optname,
271	BOOL, OPT_ON, &use_lessopen, NULL,
272	{
273	"Don't use the LESSOPEN filter",
274	"Use the LESSOPEN filter",
275	NULL
276	}
277	},
278	{ 'm', &m_optname,
279	TRIPLE, OPT_OFF, &pr_type, NULL,
280	{
281	"Short prompt",
282	"Medium prompt",
283	"Long prompt"
284	}
285	},
286	{ 'n', &n_optname,
287	TRIPLE\|REPAINT, OPT_ON, &linenums, NULL,
288	{
289	"Don't use line numbers",
290	"Use line numbers",
291	"Constantly display line numbers"
292	}
293	},
294	#if LOGFILE
295	{ 'o', &o_optname,
296	STRING, 0, NULL, opt_o,
297	{ "log file: ", NULL, NULL }
298	},
299	{ 'O', &O__optname,
300	STRING, 0, NULL, opt__O,
301	{ "Log file: ", NULL, NULL }
302	},
303	#endif
304	{ 'p', &p_optname,
305	STRING\|NO_TOGGLE\|NO_QUERY, 0, NULL, opt_p,
306	{ NULL, NULL, NULL }
307	},
308	{ 'P', &P__optname,
309	STRING, 0, NULL, opt__P,
310	{ "prompt: ", NULL, NULL }
311	},
312	{ 'q', &q_optname,
313	TRIPLE, OPT_OFF, &quiet, NULL,
314	{
315	"Ring the bell for errors AND at eof/bof",
316	"Ring the bell for errors but not at eof/bof",
317	"Never ring the bell"
318	}
319	},
320	{ 'r', &r_optname,
321	TRIPLE\|REPAINT, OPT_OFF, &ctldisp, NULL,
322	{
323	"Display control characters as ^X",
324	"Display control characters directly",
325	"Display control characters directly, processing ANSI sequences"
326	}
327	},
328	{ 's', &s_optname,
329	BOOL\|REPAINT, OPT_OFF, &squeeze, NULL,
330	{
331	"Display all blank lines",
332	"Squeeze multiple blank lines",
333	NULL
334	}
335	},
336	{ 'S', &S__optname,
337	BOOL\|REPAINT, OPT_OFF, &chopline, NULL,
338	{
339	"Fold long lines",
340	"Chop long lines",
341	NULL
342	}
343	},
344	#if TAGS
345	{ 't', &t_optname,
346	STRING\|NO_QUERY, 0, NULL, opt_t,
347	{ "tag: ", NULL, NULL }
348	},
349	{ 'T', &T__optname,
350	STRING, 0, NULL, opt__T,
351	{ "tags file: ", NULL, NULL }
352	},
353	#endif
354	{ 'u', &u_optname,
355	TRIPLE\|REPAINT, OPT_OFF, &bs_mode, NULL,
356	{
357	"Display underlined text in underline mode",
358	"Backspaces cause overstrike",
359	"Print backspace as ^H"
360	}
361	},
362	{ 'V', &V__optname,
363	NOVAR, 0, NULL, opt__V,
364	{ NULL, NULL, NULL }
365	},
366	{ 'w', &w_optname,
367	TRIPLE\|REPAINT, OPT_OFF, &show_attn, NULL,
368	{
369	"Don't highlight first unread line",
370	"Highlight first unread line after forward-screen",
371	"Highlight first unread line after any forward movement",
372	}
373	},
374	{ 'x', &x_optname,
375	STRING\|REPAINT, 0, NULL, opt_x,
376	{
377	"Tab stops: ",
378	"0123456789,",
379	NULL
380	}
381	},
382	{ 'X', &X__optname,
383	BOOL\|NO_TOGGLE, OPT_OFF, &no_init, NULL,
384	{
385	"Send init/deinit strings to terminal",
386	"Don't use init/deinit strings",
387	NULL
388	}
389	},
390	{ 'y', &y_optname,
391	NUMBER, -1, &forw_scroll, NULL,
392	{
393	"Forward scroll limit: ",
394	"Forward scroll limit is %d lines",
395	NULL
396	}
397	},
398	{ 'z', &z_optname,
399	NUMBER, -1, &swindow, NULL,
400	{
401	"Scroll window size: ",
402	"Scroll window size is %d lines",
403	NULL
404	}
405	},
406	{ '"', &quote_optname,
407	STRING, 0, NULL, opt_quote,
408	{ "quotes: ", NULL, NULL }
409	},
410	{ '~', &tilde_optname,
411	BOOL\|REPAINT, OPT_ON, &twiddle, NULL,
412	{
413	"Don't show tildes after end of file",
414	"Show tildes after end of file",
415	NULL
416	}
417	},
418	{ '?', &query_optname,
419	NOVAR, 0, NULL, opt_query,
420	{ NULL, NULL, NULL }
421	},
422	{ '#', &pound_optname,
a9adbba3	423	STRING, 0, NULL, opt_shift,
131ccf9c PA	424	{
131ccf9c PA	425	"Horizontal shift: ",
a9adbba3	426	"0123456789.",
131ccf9c PA	427	NULL
	428	}
	429	},
	430	{ '.', &keypad_optname,
	431	BOOL\|NO_TOGGLE, OPT_OFF, &no_keypad, NULL,
	432	{
	433	"Use keypad mode",
	434	"Don't use keypad mode",
	435	NULL
	436	}
	437	},
	438	{ '.', &oldbot_optname,
	439	BOOL, OPT_OFF, &oldbot, NULL,
	440	{
	441	"Use new bottom of screen behavior",
	442	"Use old bottom of screen behavior",
	443	NULL
	444	}
	445	},
3336a202 PA	446	{ '.', &follow_optname,
	447	BOOL, FOLLOW_DESC, &follow_mode, NULL,
	448	{
	449	"F command Follows file descriptor",
	450	"F command Follows file name",
	451	NULL
	452	}
	453	},
131ccf9c PA	454	{ '\0', NULL, NOVAR, 0, NULL, NULL, { NULL, NULL, NULL } }
	455	};
	456
	457
	458	/*
	459	* Initialize each option to its default value.
	460	*/
	461	public void
	462	init_option()
	463	{
	464	register struct loption *o;
	465	char *p;
	466
	467	p = lgetenv("LESS_IS_MORE");
	468	if (p != NULL && *p != '\0')
	469	less_is_more = 1;
	470
	471	for (o = option; o->oletter != '\0'; o++)
	472	{
	473	/*
	474	* Set each variable to its default.
	475	*/
	476	if (o->ovar != NULL)
	477	*(o->ovar) = o->odefault;
	478	if (o->otype & INIT_HANDLER)
	479	((o->ofunc))(INIT, (char ) NULL);
	480	}
	481	}
	482
	483	/*
	484	* Find an option in the option table, given its option letter.
	485	*/
	486	public struct loption *
	487	findopt(c)
	488	int c;
	489	{
	490	register struct loption *o;
	491
	492	for (o = option; o->oletter != '\0'; o++)
	493	{
	494	if (o->oletter == c)
	495	return (o);
	496	if ((o->otype & TRIPLE) && ASCII_TO_UPPER(o->oletter) == c)
	497	return (o);
	498	}
	499	return (NULL);
	500	}
	501
	502	/*
	503	*
	504	*/
	505	static int
	506	is_optchar(c)
	507	char c;
	508	{
	509	if (ASCII_IS_UPPER(c))
	510	return 1;
	511	if (ASCII_IS_LOWER(c))
	512	return 1;
	513	if (c == '-')
	514	return 1;
	515	return 0;
	516	}
	517
518	/*
519	* Find an option in the option table, given its option name.
520	* p_optname is the (possibly partial) name to look for, and
521	* is updated to point after the matched name.
522	* p_oname if non-NULL is set to point to the full option name.
523	*/
524	public struct loption *
525	findopt_name(p_optname, p_oname, p_err)
526	char **p_optname;
527	char **p_oname;
528	int *p_err;
529	{
530	char optname = p_optname;
531	register struct loption *o;
532	register struct optname *oname;
533	register int len;
534	int uppercase;
535	struct loption *maxo = NULL;
536	struct optname *maxoname = NULL;
537	int maxlen = 0;
538	int ambig = 0;
539	int exact = 0;
540
541	/*
542	* Check all options.
543	*/
544	for (o = option; o->oletter != '\0'; o++)
545	{
546	/*
547	* Check all names for this option.
548	*/
549	for (oname = o->onames; oname != NULL; oname = oname->onext)
550	{
551	/*
552	* Try normal match first (uppercase == 0),
553	* then, then if it's a TRIPLE option,
554	* try uppercase match (uppercase == 1).
555	*/
556	for (uppercase = 0; uppercase <= 1; uppercase++)
557	{
558	len = sprefix(optname, oname->oname, uppercase);
559	if (len <= 0 \|\| is_optchar(optname[len]))
560	{
561	/*
562	* We didn't use all of the option name.
563	*/
564	continue;
565	}
566	if (!exact && len == maxlen)
567	/*
568	* Already had a partial match,
569	* and now there's another one that
570	* matches the same length.
571	*/
572	ambig = 1;
573	else if (len > maxlen)
574	{
575	/*
576	* Found a better match than
577	* the one we had.
578	*/
579	maxo = o;
580	maxoname = oname;
581	maxlen = len;
582	ambig = 0;
583	exact = (len == (int)strlen(oname->oname));
584	}
585	if (!(o->otype & TRIPLE))
586	break;
587	}
588	}
589	}
590	if (ambig)
591	{
592	/*
593	* Name matched more than one option.
594	*/
595	if (p_err != NULL)
596	*p_err = OPT_AMBIG;
597	return (NULL);
598	}
599	*p_optname = optname + maxlen;
600	if (p_oname != NULL)
601	*p_oname = maxoname == NULL ? NULL : maxoname->oname;
602	return (maxo);
603	}