Import the [now] dual licensed version 3.5.4 of less. It is

distributed under your choice of the GPL or a BSD style license.

Reviewed by:	peter
Obtained from:	http://home.flash.net/~marknu/less/

1 files changed, 436 insertions, 0 deletions

diff --git a/contrib/less/opttbl.c b/contrib/less/opttbl.c
new file mode 100644
index 0000000..da4bef0
--- /dev/null
+++ b/contrib/less/opttbl.c
@@ -0,0 +1,436 @@
+/*
+ * Copyright (C) 1984-2000  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 cbufs;		/* Current number of buffers */
+public int autobuf;		/* Automatically allocate buffers as needed */
+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 int chopline;		/* Truncate displayed lines at screen width */
+public int no_init;		/* Disable sending ti/te termcap strings */
+public int twiddle;             /* Show tildes after EOF */
+public int show_attn;		/* Hilite first unread line */
+#if HILITE_SEARCH
+public int hilite_search;	/* Highlight matched search patterns? */
+#endif
+
+/*
+ * 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 };
+#if USERFILE
+static struct optname k_optname      = { "lesskey-file",         NULL };
+#endif
+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 };
+
+
+/*
+ * Table of all options and their semantics.
+ */
+static struct option option[] =
+{
+	{ 'a', &a_optname,
+		BOOL, OPT_OFF, &how_search, NULL,
+		"Search includes displayed screen",
+		"Search skips displayed screen",
+		NULL
+	},
+
+	{ 'b', &b_optname,
+		NUMBER, 10, &cbufs, opt_b, 
+		"Buffers: ",
+		"%d buffers",
+		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 clearing each line",
+		"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: ", NULL, 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,
+		NUMBER, 1, &jump_sline, NULL,
+		"Target line: ",
+		"Position target at screen line %d",
+		NULL
+	},
+#if USERFILE
+	{ 'k', &k_optname,
+		STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_k,
+		NULL, NULL, NULL
+	},
+#endif
+	{ 'l', NULL,
+		STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_l,
+		NULL, NULL, 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,
+		NUMBER|REPAINT, 8, &tabstop, NULL,
+		"Tab stops: ",
+		"Tab stops every %d spaces", 
+		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
+	},
+	{ '\0', NULL, NOVAR, 0, NULL, NULL, NULL, NULL, NULL }
+};
+
+
+/*
+ * Initialize each option to its default value.
+ */
+	public void
+init_option()
+{
+	register struct option *o;
+
+	for (o = option;  o->oletter != '\0';  o++)
+	{
+		/*
+		 * Set each variable to its default.
+		 */
+		if (o->ovar != NULL)
+			*(o->ovar) = o->odefault;
+	}
+}
+
+/*
+ * Find an option in the option table, given its option letter.
+ */
+	public struct option *
+findopt(c)
+	int c;
+{
+	register struct option *o;
+
+	for (o = option;  o->oletter != '\0';  o++)
+	{
+		if (o->oletter == c)
+			return (o);
+		if ((o->otype & TRIPLE) && toupper(o->oletter) == c)
+			return (o);
+	}
+	return (NULL);
+}
+
+/*
+ * 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 option *
+findopt_name(p_optname, p_oname, p_err)
+	char **p_optname;
+	char **p_oname;
+	int *p_err;
+{
+	char *optname = *p_optname;
+	register struct option *o;
+	register struct optname *oname;
+	register int len;
+	int uppercase;
+	struct option *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 (!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 == 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->oname;
+	return (maxo);
+}