initial import of NetBSD tree

1 files changed, 890 insertions, 0 deletions

diff --git a/usr.bin/vi/common/options.c b/usr.bin/vi/common/options.c
new file mode 100644
index 00000000000..089a7b86ba2
--- /dev/null
+++ b/usr.bin/vi/common/options.c
@@ -0,0 +1,890 @@
+/*-
+ * Copyright (c) 1991, 1993, 1994
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#)options.c	8.66 (Berkeley) 8/17/94";
+#endif /* not lint */
+
+#include <sys/types.h>
+#include <sys/queue.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+
+#include <bitstring.h>
+#include <ctype.h>
+#include <errno.h>
+#include <limits.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <termios.h>
+#include <unistd.h>
+
+#include "compat.h"
+#include <db.h>
+#include <regex.h>
+#include <pathnames.h>
+
+#include "vi.h"
+#include "excmd.h"
+
+static int	 	 opts_abbcmp __P((const void *, const void *));
+static int	 	 opts_cmp __P((const void *, const void *));
+static OPTLIST const	*opts_prefix __P((char *));
+static int	 	 opts_print __P((SCR *, OPTLIST const *));
+
+/*
+ * O'Reilly noted options and abbreviations are from "Learning the VI Editor",
+ * Fifth Edition, May 1992.  There's no way of knowing what systems they are
+ * actually from.
+ *
+ * HPUX noted options and abbreviations are from "The Ultimate Guide to the
+ * VI and EX Text Editors", 1990.
+ */
+static OPTLIST const optlist[] = {
+/* O_ALTWERASE	  4.4BSD */
+	{"altwerase",	f_altwerase,	OPT_0BOOL,	0},
+/* O_AUTOINDENT	    4BSD */
+	{"autoindent",	NULL,		OPT_0BOOL,	0},
+/* O_AUTOPRINT	    4BSD */
+	{"autoprint",	NULL,		OPT_1BOOL,	0},
+/* O_AUTOWRITE	    4BSD */
+	{"autowrite",	NULL,		OPT_0BOOL,	0},
+/* O_BEAUTIFY	    4BSD */
+	{"beautify",	NULL,		OPT_0BOOL,	0},
+/* O_CDPATH	  4.4BSD */
+	{"cdpath",	f_cdpath,	OPT_STR,	0},
+/* O_COLUMNS	  4.4BSD */
+	{"columns",	f_columns,	OPT_NUM,	OPT_NOSAVE},
+/* O_COMMENT	  4.4BSD */
+	{"comment",	NULL,		OPT_0BOOL,	0},
+/* O_DIGRAPH	  XXX: Elvis */
+	{"digraph",	NULL,		OPT_0BOOL,	0},
+/* O_DIRECTORY	    4BSD */
+	{"directory",	NULL,		OPT_STR,	0},
+/* O_EDCOMPATIBLE   4BSD */
+	{"edcompatible",NULL,		OPT_0BOOL,	0},
+/* O_ERRORBELLS	    4BSD */
+	{"errorbells",	NULL,		OPT_0BOOL,	0},
+/* O_EXRC	System V (undocumented) */
+	{"exrc",	NULL,		OPT_0BOOL,	0},
+/* O_EXTENDED	  4.4BSD */
+	{"extended",	NULL,		OPT_0BOOL,	0},
+/* O_FLASH	    HPUX */
+	{"flash",	NULL,		OPT_1BOOL,	0},
+/* O_HARDTABS	    4BSD */
+	{"hardtabs",	NULL,		OPT_NUM,	0},
+/* O_IGNORECASE	    4BSD */
+	{"ignorecase",	NULL,		OPT_0BOOL,	0},
+/* O_KEYTIME	  4.4BSD */
+	{"keytime",	NULL,		OPT_NUM,	0},
+/* O_LEFTRIGHT	  4.4BSD */
+	{"leftright",	f_leftright,	OPT_0BOOL,	0},
+/* O_LINES	  4.4BSD */
+	{"lines",	f_lines,	OPT_NUM,	OPT_NOSAVE},
+/* O_LISP	    4BSD */
+/*
+ * XXX
+ * When the lisp option is implemented, delete
+ * the OPT_NOSAVE flag, so that :mkexrc dumps it.
+ */
+	{"lisp",	f_lisp,		OPT_0BOOL,	OPT_NOSAVE},
+/* O_LIST	    4BSD */
+	{"list",	f_list,		OPT_0BOOL,	0},
+/* O_MAGIC	    4BSD */
+	{"magic",	NULL,		OPT_1BOOL,	0},
+/* O_MATCHTIME	  4.4BSD */
+	{"matchtime",	NULL,		OPT_NUM,	0},
+/* O_MESG	    4BSD */
+	{"mesg",	f_mesg,		OPT_1BOOL,	0},
+/* O_META	  4.4BSD */
+	{"meta",	NULL,		OPT_STR,	0},
+/* O_MODELINE	    4BSD */
+	{"modeline",	f_modeline,	OPT_0BOOL,	0},
+/* O_NUMBER	    4BSD */
+	{"number",	f_number,	OPT_0BOOL,	0},
+/* O_OCTAL	  4.4BSD */
+	{"octal",	f_octal,	OPT_0BOOL,	0},
+/* O_OPEN	    4BSD */
+	{"open",	NULL,		OPT_1BOOL,	0},
+/* O_OPTIMIZE	    4BSD */
+	{"optimize",	NULL,		OPT_1BOOL,	0},
+/* O_PARAGRAPHS	    4BSD */
+	{"paragraphs",	f_paragraph,	OPT_STR,	0},
+/* O_PROMPT	    4BSD */
+	{"prompt",	NULL,		OPT_1BOOL,	0},
+/* O_READONLY	    4BSD (undocumented) */
+	{"readonly",	f_readonly,	OPT_0BOOL,	0},
+/* O_RECDIR	  4.4BSD */
+	{"recdir",	NULL,		OPT_STR,	0},
+/* O_REDRAW	    4BSD */
+	{"redraw",	NULL,		OPT_0BOOL,	0},
+/* O_REMAP	    4BSD */
+	{"remap",	NULL,		OPT_1BOOL,	0},
+/* O_REPORT	    4BSD */
+	{"report",	NULL,		OPT_NUM,	OPT_NOSTR},
+/* O_RULER	  4.4BSD */
+	{"ruler",	NULL,		OPT_0BOOL,	0},
+/* O_SCROLL	    4BSD */
+	{"scroll",	NULL,		OPT_NUM,	0},
+/* O_SECTIONS	    4BSD */
+	{"sections",	f_section,	OPT_STR,	0},
+/* O_SHELL	    4BSD */
+	{"shell",	NULL,		OPT_STR,	0},
+/* O_SHIFTWIDTH	    4BSD */
+	{"shiftwidth",	f_shiftwidth,	OPT_NUM,	0},
+/* O_SHOWDIRTY	  4.4BSD */
+	{"showdirty",	NULL,		OPT_0BOOL,	0},
+/* O_SHOWMATCH	    4BSD */
+	{"showmatch",	NULL,		OPT_0BOOL,	0},
+/* O_SHOWMODE	  4.4BSD */
+	{"showmode",	NULL,		OPT_0BOOL,	0},
+/* O_SIDESCROLL	  4.4BSD */
+	{"sidescroll",	NULL,		OPT_NUM,	0},
+/* O_SLOWOPEN	    4BSD  */
+	{"slowopen",	NULL,		OPT_0BOOL,	0},
+/* O_SOURCEANY	    4BSD (undocumented) */
+	{"sourceany",	f_sourceany,	OPT_0BOOL,	0},
+/* O_TABSTOP	    4BSD */
+	{"tabstop",	f_tabstop,	OPT_NUM,	0},
+/* O_TAGLENGTH	    4BSD */
+	{"taglength",	NULL,		OPT_NUM,	OPT_NOSTR},
+/* O_TAGS	    4BSD */
+	{"tags",	f_tags,		OPT_STR,	0},
+/* O_TERM	    4BSD */
+	{"term",	f_term,		OPT_STR,	OPT_NOSAVE},
+/* O_TERSE	    4BSD */
+	{"terse",	NULL,		OPT_0BOOL,	0},
+/* O_TILDEOP      4.4BSD */
+	{"tildeop",	NULL,		OPT_0BOOL,	0},
+/* O_TIMEOUT	    4BSD (undocumented) */
+	{"timeout",	NULL,		OPT_1BOOL,	0},
+/* O_TTYWERASE	  4.4BSD */
+	{"ttywerase",	f_ttywerase,	OPT_0BOOL,	0},
+/* O_VERBOSE	  4.4BSD */
+	{"verbose",	NULL,		OPT_0BOOL,	0},
+/* O_W1200	    4BSD */
+	{"w1200",	f_w1200,	OPT_NUM,	OPT_NEVER|OPT_NOSAVE},
+/* O_W300	    4BSD */
+	{"w300",	f_w300,		OPT_NUM,	OPT_NEVER|OPT_NOSAVE},
+/* O_W9600	    4BSD */
+	{"w9600",	f_w9600,	OPT_NUM,	OPT_NEVER|OPT_NOSAVE},
+/* O_WARN	    4BSD */
+	{"warn",	NULL,		OPT_1BOOL,	0},
+/* O_WINDOW	    4BSD */
+	{"window",	f_window,	OPT_NUM,	0},
+/* O_WRAPMARGIN	    4BSD */
+	{"wrapmargin",	NULL,		OPT_NUM,	OPT_NOSTR},
+/* O_WRAPSCAN	    4BSD */
+	{"wrapscan",	NULL,		OPT_1BOOL,	0},
+/* O_WRITEANY	    4BSD */
+	{"writeany",	NULL,		OPT_0BOOL,	0},
+	{NULL},
+};
+
+typedef struct abbrev {
+        char *name;
+        int offset;
+} OABBREV;
+
+static OABBREV const abbrev[] = {
+	{"ai",		O_AUTOINDENT},		/*     4BSD */
+	{"ap",		O_AUTOPRINT},		/*     4BSD */
+	{"aw",		O_AUTOWRITE},		/*     4BSD */
+	{"bf",		O_BEAUTIFY},		/*     4BSD */
+	{"co",		O_COLUMNS},		/*   4.4BSD */
+	{"dir",		O_DIRECTORY},		/*     4BSD */
+	{"eb",		O_ERRORBELLS},		/*     4BSD */
+	{"ed",		O_EDCOMPATIBLE},	/*     4BSD */
+	{"ex",		O_EXRC},		/* System V (undocumented) */
+	{"ht",		O_HARDTABS},		/*     4BSD */
+	{"ic",		O_IGNORECASE},		/*     4BSD */
+	{"li",		O_LINES},		/*   4.4BSD */
+	{"modelines",	O_MODELINE},		/*     HPUX */
+	{"nu",		O_NUMBER},		/*     4BSD */
+	{"opt",		O_OPTIMIZE},		/*     4BSD */
+	{"para",	O_PARAGRAPHS},		/*     4BSD */
+	{"re",		O_REDRAW},		/* O'Reilly */
+	{"ro",		O_READONLY},		/*     4BSD (undocumented) */
+	{"scr",		O_SCROLL},		/*     4BSD (undocumented) */
+	{"sect",	O_SECTIONS},		/* O'Reilly */
+	{"sh",		O_SHELL},		/*     4BSD */
+	{"slow",	O_SLOWOPEN},		/*     4BSD */
+	{"sm",		O_SHOWMATCH},		/*     4BSD */
+	{"sw",		O_SHIFTWIDTH},		/*     4BSD */
+	{"tag",		O_TAGS},		/*     4BSD (undocumented) */
+	{"tl",		O_TAGLENGTH},		/*     4BSD */
+	{"to",		O_TIMEOUT},		/*     4BSD (undocumented) */
+	{"ts",		O_TABSTOP},		/*     4BSD */
+	{"tty",		O_TERM},		/*     4BSD (undocumented) */
+	{"ttytype",	O_TERM},		/*     4BSD (undocumented) */
+	{"w",		O_WINDOW},		/* O'Reilly */
+	{"wa",		O_WRITEANY},		/*     4BSD */
+	{"wi",		O_WINDOW},		/*     4BSD (undocumented) */
+	{"wm",		O_WRAPMARGIN},		/*     4BSD */
+	{"ws",		O_WRAPSCAN},		/*     4BSD */
+	{NULL},
+};
+
+/*
+ * opts_init --
+ *	Initialize some of the options.  Since the user isn't really
+ *	"setting" these variables, don't set their OPT_SET bits.
+ */
+int
+opts_init(sp)
+	SCR *sp;
+{
+	ARGS *argv[2], a, b;
+	OPTLIST const *op;
+	u_long v;
+	int cnt;
+	char *s, b1[1024];
+
+	a.bp = b1;
+	a.len = 0;
+	b.bp = NULL;
+	b.len = 0;
+	argv[0] = &a;
+	argv[1] = &b;
+
+#define	SET_DEF(opt, str) {						\
+	if (str != b1)		/* GCC puts strings in text-space. */	\
+		(void)strcpy(b1, str);					\
+	a.len = strlen(b1);						\
+	if (opts_set(sp, NULL, argv)) {					\
+		msgq(sp, M_ERR,						\
+		    "Unable to set default %s option", optlist[opt]);	\
+		return (1);						\
+	}								\
+	F_CLR(&sp->opts[opt], OPT_SET);					\
+}
+	/* Set default values. */
+	for (op = optlist, cnt = 0; op->name != NULL; ++op, ++cnt)
+		if (op->type == OPT_0BOOL)
+			O_CLR(sp, cnt);
+		else if (op->type == OPT_1BOOL)
+			O_SET(sp, cnt);
+
+	(void)snprintf(b1, sizeof(b1), "cdpath=%s",
+	    (s = getenv("CDPATH")) == NULL ? ":" : s);
+	SET_DEF(O_CDPATH, b1);
+
+	/*
+	 * !!!
+	 * Vi historically stored temporary files in /var/tmp.  We store them
+	 * in /tmp by default, hoping it's a memory based file system.  There
+	 * are two ways to change this -- the user can set either the directory
+	 * option or the TMPDIR environmental variable.
+	 */
+	(void)snprintf(b1, sizeof(b1), "directory=%s",
+	    (s = getenv("TMPDIR")) == NULL ? _PATH_TMP : s);
+	SET_DEF(O_DIRECTORY, b1);
+	SET_DEF(O_KEYTIME, "keytime=6");
+	SET_DEF(O_MATCHTIME, "matchtime=7");
+	SET_DEF(O_META, "meta=~{[*?$`'\"\\");
+	SET_DEF(O_REPORT, "report=5");
+	SET_DEF(O_PARAGRAPHS, "paragraphs=IPLPPPQPP LIpplpipbp");
+	(void)snprintf(b1, sizeof(b1), "recdir=%s", _PATH_PRESERVE);
+	SET_DEF(O_RECDIR, b1);
+	SET_DEF(O_SECTIONS, "sections=NHSHH HUnhsh");
+	(void)snprintf(b1, sizeof(b1), "shell=%s",
+	    (s = getenv("SHELL")) == NULL ? _PATH_BSHELL : s);
+	SET_DEF(O_SHELL, b1);
+	SET_DEF(O_SHIFTWIDTH, "shiftwidth=8");
+	SET_DEF(O_SIDESCROLL, "sidescroll=16");
+	SET_DEF(O_TABSTOP, "tabstop=8");
+	(void)snprintf(b1, sizeof(b1), "tags=%s", _PATH_TAGS);
+	SET_DEF(O_TAGS, b1);
+	(void)snprintf(b1, sizeof(b1), "term=%s",
+	    (s = getenv("TERM")) == NULL ? "unknown" : s);
+	SET_DEF(O_TERM, b1);
+
+	/*
+	 * XXX
+	 * Initialize ^D, ^U scrolling value here, after TERM.  (We didn't
+	 * have the options information when the screen was initialized.)
+	 * Initializing term should have created a LINES/COLUMNS value.
+	 */
+	sp->defscroll = O_VAL(sp, O_LINES) / 2;
+	(void)snprintf(b1, sizeof(b1), "scroll=%ld", sp->defscroll);
+	SET_DEF(O_SCROLL, b1);
+
+	/*
+	 * The default window option values are:
+	 *		8 if baud rate <=  600
+	 *	       16 if baud rate <= 1200
+	 *	LINES - 1 if baud rate  > 1200
+	 */
+	v = baud_from_bval(sp);
+	if (v <= 600)
+		v = 8;
+	else if (v <= 1200)
+		v = 16;
+	else
+		v = O_VAL(sp, O_LINES) - 1;
+	(void)snprintf(b1, sizeof(b1), "window=%lu", v);
+	SET_DEF(O_WINDOW, b1);
+
+	SET_DEF(O_WRAPMARGIN, "wrapmargin=0");
+
+	/*
+	 * By default, the historic vi always displayed information
+	 * about two options, redraw and term.  Term seems sufficient.
+	 */
+	F_SET(&sp->opts[O_TERM], OPT_SET);
+	return (0);
+}
+
+/*
+ * opts_set --
+ *	Change the values of one or more options.
+ */
+int
+opts_set(sp, usage, argv)
+	SCR *sp;
+	char *usage;
+	ARGS *argv[];
+{
+	enum optdisp disp;
+	OABBREV atmp, *ap;
+	OPTLIST const *op;
+	OPTLIST otmp;
+	OPTION *spo;
+	u_long value, turnoff;
+	int ch, equals, offset, qmark, rval;
+	char *endp, *name, *p, *sep; 
+
+	disp = NO_DISPLAY;
+	for (rval = 0; argv[0]->len != 0; ++argv) {
+		/*
+		 * The historic vi dumped the options for each occurrence of
+		 * "all" in the set list.  Puhleeze.
+		 */
+		if (!strcmp(argv[0]->bp, "all")) {
+			disp = ALL_DISPLAY;
+			continue;
+		}
+
+		/* Find equals sign or question mark. */
+		for (sep = NULL, equals = qmark = 0,
+		    p = name = argv[0]->bp; (ch = *p) != '\0'; ++p)
+			if (ch == '=' || ch == '?') {
+				if (p == name) {
+					if (usage != NULL)
+						msgq(sp,
+						    M_ERR, "Usage: %s", usage);
+					return (1);
+				}
+				sep = p;
+				if (ch == '=')
+					equals = 1;
+				else
+					qmark = 1;
+				break;
+			}
+
+		turnoff = 0;
+		op = NULL;
+		if (sep != NULL)
+			*sep++ = '\0';
+
+		/* Check list of abbreviations. */
+		atmp.name = name;
+		if ((ap = bsearch(&atmp, abbrev,
+		    sizeof(abbrev) / sizeof(OABBREV) - 1,
+		    sizeof(OABBREV), opts_abbcmp)) != NULL) {
+			op = optlist + ap->offset;
+			goto found;
+		}
+
+		/* Check list of options. */
+		otmp.name = name;
+		if ((op = bsearch(&otmp, optlist,
+		    sizeof(optlist) / sizeof(OPTLIST) - 1,
+		    sizeof(OPTLIST), opts_cmp)) != NULL)
+			goto found;
+
+		/* Try the name without any leading "no". */
+		if (name[0] == 'n' && name[1] == 'o') {
+			turnoff = 1;
+			name += 2;
+		} else
+			goto prefix;
+
+		/* Check list of abbreviations. */
+		atmp.name = name;
+		if ((ap = bsearch(&atmp, abbrev,
+		    sizeof(abbrev) / sizeof(OABBREV) - 1,
+		    sizeof(OABBREV), opts_abbcmp)) != NULL) {
+			op = optlist + ap->offset;
+			goto found;
+		}
+
+		/* Check list of options. */
+		otmp.name = name;
+		if ((op = bsearch(&otmp, optlist,
+		    sizeof(optlist) / sizeof(OPTLIST) - 1,
+		    sizeof(OPTLIST), opts_cmp)) != NULL)
+			goto found;
+
+		/* Check for prefix match. */
+prefix:		op = opts_prefix(name);
+
+found:		if (op == NULL) {
+			msgq(sp, M_ERR,
+			    "no %s option: 'set all' gives all option values",
+			    name);
+			continue;
+		}
+
+		/* Find current option values. */
+		offset = op - optlist;
+		spo = sp->opts + offset;
+
+		/*
+		 * !!!
+		 * Historically, the question mark could be a separate
+		 * argument.
+		 */
+		if (!equals && !qmark &&
+		    argv[1]->len == 1 && argv[1]->bp[0] == '?') {
+			++argv;
+			qmark = 1;
+		}
+
+		/* Set name, value. */
+		switch (op->type) {
+		case OPT_0BOOL:
+		case OPT_1BOOL:
+			if (equals) {
+				msgq(sp, M_ERR,
+				    "set: [no]%s option doesn't take a value",
+				    name);
+				break;
+			}
+			if (qmark) {
+				if (!disp)
+					disp = SELECT_DISPLAY;
+				F_SET(spo, OPT_SELECTED);
+				break;
+			}
+			if (op->func != NULL) {
+				if (op->func(sp, spo, NULL, turnoff)) {
+					rval = 1;
+					break;
+				}
+			} else if (turnoff)
+				O_CLR(sp, offset);
+			else
+				O_SET(sp, offset);
+			goto change;
+		case OPT_NUM:
+			/*
+			 * !!!
+			 * Extension to historic vi.  If the OPT_NOSTR flag is
+			 * set, a numeric option may be turned off by using a
+			 * "no" prefix, e.g. "nowrapmargin".  (We assume that
+			 * setting the value to 0 turns a numeric option off.)
+			 */
+			if (turnoff) {
+				if (F_ISSET(op, OPT_NOSTR)) {
+					value = 0;
+					goto nostr;
+				}
+				msgq(sp, M_ERR,
+				    "set: %s option isn't a boolean", name);
+				break;
+			}
+			if (qmark || !equals) {
+				if (!disp)
+					disp = SELECT_DISPLAY;
+				F_SET(spo, OPT_SELECTED);
+				break;
+			}
+			value = strtol(sep, &endp, 10);
+			if (*endp && !isblank(*endp)) {
+				msgq(sp, M_ERR,
+				    "set %s: illegal number %s", name, sep);
+				break;
+			}
+nostr:			if (op->func != NULL) {
+				if (op->func(sp, spo, sep, value)) {
+					rval = 1;
+					break;
+				}
+			} else
+				O_VAL(sp, offset) = value;
+			goto change;
+		case OPT_STR:
+			if (turnoff) {
+				msgq(sp, M_ERR,
+				    "set: %s option isn't a boolean", name);
+				break;
+			}
+			if (qmark || !equals) {
+				if (!disp)
+					disp = SELECT_DISPLAY;
+				F_SET(spo, OPT_SELECTED);
+				break;
+			}
+			if (op->func != NULL) {
+				if (op->func(sp, spo, sep, (u_long)0)) {
+					rval = 1;
+					break;
+				}
+			} else {
+				if (F_ISSET(&sp->opts[offset], OPT_ALLOCATED))
+					free(O_STR(sp, offset));
+				if ((O_STR(sp, offset) = strdup(sep)) == NULL) {
+					msgq(sp, M_SYSERR, NULL);
+					rval = 1;
+					break;
+				} else
+					F_SET(&sp->opts[offset], OPT_ALLOCATED);
+			}
+change:			if (sp->s_optchange != NULL)
+				(void)sp->s_optchange(sp, offset);
+			F_SET(&sp->opts[offset], OPT_SET);
+			break;
+		default:
+			abort();
+		}
+	}
+	if (disp != NO_DISPLAY)
+		opts_dump(sp, disp);
+	return (rval);
+}
+
+/*
+ * opts_dump --
+ *	List the current values of selected options.
+ */
+void
+opts_dump(sp, type)
+	SCR *sp;
+	enum optdisp type;
+{
+	OPTLIST const *op;
+	int base, b_num, cnt, col, colwidth, curlen, s_num;
+	int numcols, numrows, row;
+	int b_op[O_OPTIONCOUNT], s_op[O_OPTIONCOUNT];
+	char nbuf[20];
+
+	/*
+	 * XXX
+	 * It's possible to get here by putting "set option" in the
+	 * .exrc file.  I can't think of a clean way to layer this,
+	 * or a reasonable check to make, so we block it here.
+	 */
+	if (sp->stdfp == NULL) {
+		msgq(sp, M_ERR,
+		    "Option display requires that the screen be initialized");
+		return;
+	}
+
+	/*
+	 * Options are output in two groups -- those that fit in a column and
+	 * those that don't.  Output is done on 6 character "tab" boundaries
+	 * for no particular reason.  (Since we don't output tab characters,
+	 * we can ignore the terminal's tab settings.)  Ignore the user's tab
+	 * setting because we have no idea how reasonable it is.
+	 *
+	 * Find a column width we can live with.
+	 */
+	for (cnt = 6; cnt > 1; --cnt) {
+		colwidth = (sp->cols - 1) / cnt & ~(STANDARD_TAB - 1);
+		if (colwidth >= 10) {
+			colwidth =
+			    (colwidth + STANDARD_TAB) & ~(STANDARD_TAB - 1);
+			break;
+		}
+		colwidth = 0;
+	}
+
+	/*
+	 * Get the set of options to list, entering them into
+	 * the column list or the overflow list.
+	 */
+	for (b_num = s_num = 0, op = optlist; op->name != NULL; ++op) {
+		cnt = op - optlist;
+
+		/* If OPT_NEVER set, it's never displayed. */
+		if (F_ISSET(op, OPT_NEVER))
+			continue;
+
+		switch (type) {
+		case ALL_DISPLAY:		/* Display all. */
+			break;
+		case CHANGED_DISPLAY:		/* Display changed. */
+			if (!F_ISSET(&sp->opts[cnt], OPT_SET))
+				continue;
+			break;
+		case SELECT_DISPLAY:		/* Display selected. */
+			if (!F_ISSET(&sp->opts[cnt], OPT_SELECTED))
+				continue;
+			break;
+		default:
+		case NO_DISPLAY:
+			abort();
+			/* NOTREACHED */
+		}
+		F_CLR(&sp->opts[cnt], OPT_SELECTED);
+
+		curlen = strlen(op->name);
+		switch (op->type) {
+		case OPT_0BOOL:
+		case OPT_1BOOL:
+			if (!O_ISSET(sp, cnt))
+				curlen += 2;
+			break;
+		case OPT_NUM:
+			(void)snprintf(nbuf,
+			    sizeof(nbuf), "%ld", O_VAL(sp, cnt));
+			curlen += strlen(nbuf);
+			break;
+		case OPT_STR:
+			curlen += strlen(O_STR(sp, cnt)) + 3;
+			break;
+		}
+		/* Offset by two so there's a gap. */
+		if (curlen < colwidth - 2)
+			s_op[s_num++] = cnt;
+		else
+			b_op[b_num++] = cnt;
+	}
+
+	if (s_num > 0) {
+		/* Figure out the number of columns. */
+		numcols = (sp->cols - 1) / colwidth;
+		if (s_num > numcols) {
+			numrows = s_num / numcols;
+			if (s_num % numcols)
+				++numrows;
+		} else
+			numrows = 1;
+
+		/* Display the options in sorted order. */
+		for (row = 0; row < numrows;) {
+			for (base = row, col = 0; col < numcols; ++col) {
+				cnt = opts_print(sp, &optlist[s_op[base]]);
+				if ((base += numrows) >= s_num)
+					break;
+				(void)ex_printf(EXCOOKIE,
+				    "%*s", (int)(colwidth - cnt), "");
+			}
+			if (++row < numrows || b_num)
+				(void)ex_printf(EXCOOKIE, "\n");
+		}
+	}
+
+	for (row = 0; row < b_num;) {
+		(void)opts_print(sp, &optlist[b_op[row]]);
+		if (++row < b_num)
+			(void)ex_printf(EXCOOKIE, "\n");
+	}
+	(void)ex_printf(EXCOOKIE, "\n");
+}
+
+/*
+ * opts_print --
+ *	Print out an option.
+ */
+static int
+opts_print(sp, op)
+	SCR *sp;
+	OPTLIST const *op;
+{
+	int curlen, offset;
+
+	curlen = 0;
+	offset = op - optlist;
+	switch (op->type) {
+	case OPT_0BOOL:
+	case OPT_1BOOL:
+		curlen += ex_printf(EXCOOKIE,
+		    "%s%s", O_ISSET(sp, offset) ? "" : "no", op->name);
+		break;
+	case OPT_NUM:
+		curlen += ex_printf(EXCOOKIE,
+		     "%s=%ld", op->name, O_VAL(sp, offset));
+		break;
+	case OPT_STR:
+		curlen += ex_printf(EXCOOKIE,
+		    "%s=\"%s\"", op->name, O_STR(sp, offset));
+		break;
+	}
+	return (curlen);
+}
+
+/*
+ * opts_save --
+ *	Write the current configuration to a file.
+ */
+int
+opts_save(sp, fp)
+	SCR *sp;
+	FILE *fp;
+{
+	OPTLIST const *op;
+	int ch, cnt;
+	char *p;
+
+	for (op = optlist; op->name != NULL; ++op) {
+		if (F_ISSET(op, OPT_NOSAVE))
+			continue;
+		cnt = op - optlist;
+		switch (op->type) {
+		case OPT_0BOOL:
+		case OPT_1BOOL:
+			if (O_ISSET(sp, cnt))
+				(void)fprintf(fp, "set %s\n", op->name);
+			else
+				(void)fprintf(fp, "set no%s\n", op->name);
+			break;
+		case OPT_NUM:
+			(void)fprintf(fp,
+			    "set %s=%-3d\n", op->name, O_VAL(sp, cnt));
+			break;
+		case OPT_STR:
+			(void)fprintf(fp, "set ");
+			for (p = op->name; (ch = *p) != '\0'; ++p) {
+				if (isblank(ch) || ch == '\\')
+					(void)putc('\\', fp);
+				(void)putc(ch, fp);
+			}
+			(void)putc('=', fp);
+			for (p = O_STR(sp, cnt); (ch = *p) != '\0'; ++p) {
+				if (isblank(ch) || ch == '\\')
+					(void)putc('\\', fp);
+				(void)putc(ch, fp);
+			}
+			(void)putc('\n', fp);
+			break;
+		}
+		if (ferror(fp)) {
+			msgq(sp, M_ERR, "I/O error: %s", strerror(errno));
+			return (1);
+		}
+	}
+	return (0);
+}
+
+/*
+ * opts_prefix --
+ *	Check to see if the name is the prefix of one (and only one)
+ *	option.  If so, return the option.
+ */
+static OPTLIST const *
+opts_prefix(name)
+	char *name;
+{
+	OPTLIST const *op, *save_op;
+	size_t len;
+
+	save_op = NULL;
+	len = strlen(name);
+	for (op = optlist; op->name != NULL; ++op) {
+		if (op->name[0] < name[0])
+			continue;
+		if (op->name[0] > name[0])
+			break;
+		if (!memcmp(op->name, name, len)) {
+			if (save_op != NULL)
+				return (NULL);
+			save_op = op;
+		}
+	}
+	return (save_op);
+}
+
+static int
+opts_abbcmp(a, b)
+        const void *a, *b;
+{
+        return(strcmp(((OABBREV *)a)->name, ((OABBREV *)b)->name));
+}
+
+static int
+opts_cmp(a, b)
+        const void *a, *b;
+{
+        return(strcmp(((OPTLIST *)a)->name, ((OPTLIST *)b)->name));
+}
+
+/*
+ * opts_free --
+ *	Free all option strings
+ */
+void
+opts_free(sp)
+	SCR *sp;
+{
+	int cnt;
+	char *p;
+
+	for (cnt = 0; cnt < O_OPTIONCOUNT; ++cnt)
+		if (F_ISSET(&sp->opts[cnt], OPT_ALLOCATED)) {
+			p = O_STR(sp, cnt);
+			FREE(p, strlen(p) + 1);
+		}
+}
+
+/*
+ * opts_copy --
+ *	Copy a screen's OPTION array.
+ */
+int
+opts_copy(orig, sp)
+	SCR *orig, *sp;
+{
+	OPTION *op;
+	int cnt;
+
+	/* Copy most everything without change. */
+	memmove(sp->opts, orig->opts, sizeof(orig->opts));
+
+	/*
+	 * Allocate copies of the strings -- keep trying to reallocate
+	 * after ENOMEM failure, otherwise end up with more than one
+	 * screen referencing the original memory.
+	 */
+	for (op = sp->opts, cnt = 0; cnt < O_OPTIONCOUNT; ++cnt, ++op)
+		if (F_ISSET(&sp->opts[cnt], OPT_ALLOCATED) &&
+		    (O_STR(sp, cnt) = strdup(O_STR(sp, cnt))) == NULL) {
+			msgq(orig, M_SYSERR, NULL);
+			return (1);
+		}
+	return (0);
+}