Add m-esr52 at 52.6.0

1 files changed, 1341 insertions, 0 deletions

diff --git a/js/src/editline/editline.c b/js/src/editline/editline.c
new file mode 100644
index 000000000..8146bb82f
--- /dev/null
+++ b/js/src/editline/editline.c
@@ -0,0 +1,1341 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * Copyright 1992,1993 Simmule Turner and Rich Salz.  All rights reserved.
+ *
+ * This software is not subject to any license of the American Telephone
+ * and Telegraph Company or of the Regents of the University of California.
+ *
+ * Permission is granted to anyone to use this software for any purpose on
+ * any computer system, and to alter it and redistribute it freely, subject
+ * to the following restrictions:
+ * 1. The authors are not responsible for the consequences of use of this
+ *    software, no matter how awful, even if they arise from flaws in it.
+ * 2. The origin of this software must not be misrepresented, either by
+ *    explicit claim or by omission.  Since few users ever read sources,
+ *    credits must appear in the documentation.
+ * 3. Altered versions must be plainly marked as such, and must not be
+ *    misrepresented as being the original software.  Since few users
+ *    ever read sources, credits must appear in the documentation.
+ * 4. This notice may not be removed or altered.
+ */
+
+
+/*
+**  Main editing routines for editline library.
+*/
+#include "editline.h"
+#include <signal.h>
+#include <ctype.h>
+#include <unistd.h>
+
+/*
+**  Manifest constants.
+*/
+#define SCREEN_WIDTH	80
+#define SCREEN_ROWS	24
+#define NO_ARG		(-1)
+#define DEL		127
+#define CTL(x)		((x) & 0x1F)
+#define ISCTL(x)	((x) && (x) < ' ')
+#define UNCTL(x)	((x) + 64)
+#define META(x)		((x) | 0x80)
+#define ISMETA(x)	((x) & 0x80)
+#define UNMETA(x)	((x) & 0x7F)
+#if	!defined(HIST_SIZE)
+#define HIST_SIZE	20
+#endif	/* !defined(HIST_SIZE) */
+
+/*
+**  Command status codes.
+*/
+typedef enum _STATUS {
+    CSdone, CSeof, CSmove, CSdispatch, CSstay, CSsignal
+} STATUS;
+
+/*
+**  The type of case-changing to perform.
+*/
+typedef enum _CASE {
+    TOupper, TOlower
+} CASE;
+
+/*
+**  Key to command mapping.
+*/
+typedef struct _KEYMAP {
+    CHAR	Key;
+    STATUS	(*Function)();
+} KEYMAP;
+
+/*
+**  Command history structure.
+*/
+typedef struct _HISTORY {
+    int		Size;
+    int		Pos;
+    CHAR	*Lines[HIST_SIZE];
+} HISTORY;
+
+/*
+**  Globals.
+*/
+unsigned	rl_eof;
+unsigned	rl_erase;
+unsigned	rl_intr;
+unsigned	rl_kill;
+unsigned	rl_quit;
+
+STATIC CHAR		NIL[] = "";
+STATIC CONST CHAR	*Input = NIL;
+STATIC CHAR		*Line;
+STATIC CONST char	*Prompt;
+STATIC CHAR		*Yanked;
+STATIC char		*Screen;
+STATIC CONST char	NEWLINE[]= CRLF;
+STATIC HISTORY		H;
+STATIC int		Repeat;
+STATIC int		End;
+STATIC int		Mark;
+STATIC int		OldPoint;
+STATIC int		Point;
+STATIC int		PushBack;
+STATIC int		Pushed;
+STATIC int		Signal;
+FORWARD CONST KEYMAP	Map[32];
+FORWARD CONST KEYMAP	MetaMap[16];
+STATIC SIZE_T		Length;
+STATIC SIZE_T		ScreenCount;
+STATIC SIZE_T		ScreenSize;
+STATIC char		*backspace;
+STATIC int		TTYwidth;
+STATIC int		TTYrows;
+
+/* Display print 8-bit chars as `M-x' or as the actual 8-bit char? */
+int		rl_meta_chars = 0;
+
+/*
+**  Declarations.
+*/
+STATIC CHAR	*editinput();
+#if	defined(USE_TERMCAP)
+#include <stdlib.h>
+#include <curses.h>
+#include <term.h>
+#endif	/* defined(USE_TERMCAP) */
+
+/*
+**  TTY input/output functions.
+*/
+
+STATIC void
+TTYflush()
+{
+    if (ScreenCount) {
+        /* Dummy assignment avoids GCC warning on
+         * "attribute warn_unused_result" */
+	ssize_t dummy = write(1, Screen, ScreenCount);
+        (void)dummy;
+	ScreenCount = 0;
+    }
+}
+
+STATIC void
+TTYput(c)
+    CHAR	c;
+{
+    Screen[ScreenCount] = c;
+    if (++ScreenCount >= ScreenSize - 1) {
+	ScreenSize += SCREEN_INC;
+	RENEW(Screen, char, ScreenSize);
+    }
+}
+
+STATIC void
+TTYputs(p)
+    CONST CHAR	*p;
+{
+    while (*p)
+	TTYput(*p++);
+}
+
+STATIC void
+TTYshow(c)
+    CHAR	c;
+{
+    if (c == DEL) {
+	TTYput('^');
+	TTYput('?');
+    }
+    else if (ISCTL(c)) {
+	TTYput('^');
+	TTYput(UNCTL(c));
+    }
+    else if (rl_meta_chars && ISMETA(c)) {
+	TTYput('M');
+	TTYput('-');
+	TTYput(UNMETA(c));
+    }
+    else
+	TTYput(c);
+}
+
+STATIC void
+TTYstring(p)
+    CHAR	*p;
+{
+    while (*p)
+	TTYshow(*p++);
+}
+
+STATIC unsigned int
+TTYget()
+{
+    CHAR	c;
+
+    TTYflush();
+    if (Pushed) {
+	Pushed = 0;
+	return PushBack;
+    }
+    if (*Input)
+	return *Input++;
+    return read(0, &c, (SIZE_T)1) == 1 ? c : EOF;
+}
+
+#define TTYback()	(backspace ? TTYputs((CHAR *)backspace) : TTYput('\b'))
+
+STATIC void
+TTYbackn(n)
+    int		n;
+{
+    while (--n >= 0)
+	TTYback();
+}
+
+STATIC void
+TTYinfo()
+{
+    static int		init;
+#if	defined(USE_TERMCAP)
+    char		*term;
+    char		buff[2048];
+    char		*bp, *p;
+#endif	/* defined(USE_TERMCAP) */
+#if	defined(TIOCGWINSZ)
+    struct winsize	W;
+#endif	/* defined(TIOCGWINSZ) */
+
+    if (init) {
+#if	defined(TIOCGWINSZ)
+	/* Perhaps we got resized. */
+	if (ioctl(0, TIOCGWINSZ, &W) >= 0
+	 && W.ws_col > 0 && W.ws_row > 0) {
+	    TTYwidth = (int)W.ws_col;
+	    TTYrows = (int)W.ws_row;
+	}
+#endif	/* defined(TIOCGWINSZ) */
+	return;
+    }
+    init++;
+
+    TTYwidth = TTYrows = 0;
+#if	defined(USE_TERMCAP)
+    bp = &buff[0];
+    if ((term = getenv("TERM")) == NULL)
+	term = "dumb";
+    if (tgetent(buff, term) < 0) {
+       TTYwidth = SCREEN_WIDTH;
+       TTYrows = SCREEN_ROWS;
+       return;
+    }
+    p = tgetstr("le", &bp);
+    backspace = p ? strdup(p) : NULL;
+    TTYwidth = tgetnum("co");
+    TTYrows = tgetnum("li");
+#endif	/* defined(USE_TERMCAP) */
+
+#if	defined(TIOCGWINSZ)
+    if (ioctl(0, TIOCGWINSZ, &W) >= 0) {
+	TTYwidth = (int)W.ws_col;
+	TTYrows = (int)W.ws_row;
+    }
+#endif	/* defined(TIOCGWINSZ) */
+
+    if (TTYwidth <= 0 || TTYrows <= 0) {
+	TTYwidth = SCREEN_WIDTH;
+	TTYrows = SCREEN_ROWS;
+    }
+}
+
+
+STATIC void
+reposition()
+{
+    int		i;
+    CHAR	*p;
+
+    TTYput('\r');
+    TTYputs((CONST CHAR *)Prompt);
+    for (i = Point, p = Line; --i >= 0; p++)
+	TTYshow(*p);
+}
+
+STATIC void
+left(Change)
+    STATUS	Change;
+{
+    TTYback();
+    if (Point) {
+	if (ISCTL(Line[Point - 1]))
+	    TTYback();
+        else if (rl_meta_chars && ISMETA(Line[Point - 1])) {
+	    TTYback();
+	    TTYback();
+	}
+    }
+    if (Change == CSmove)
+	Point--;
+}
+
+STATIC void
+right(Change)
+    STATUS	Change;
+{
+    TTYshow(Line[Point]);
+    if (Change == CSmove)
+	Point++;
+}
+
+STATIC STATUS
+ring_bell()
+{
+    TTYput('\07');
+    TTYflush();
+    return CSstay;
+}
+
+STATIC STATUS
+do_macro(c)
+    unsigned int	c;
+{
+    CHAR		name[4];
+
+    name[0] = '_';
+    name[1] = c;
+    name[2] = '_';
+    name[3] = '\0';
+
+    if ((Input = (CHAR *)getenv((char *)name)) == NULL) {
+	Input = NIL;
+	return ring_bell();
+    }
+    return CSstay;
+}
+
+STATIC STATUS
+do_forward(move)
+    STATUS	move;
+{
+    int		i;
+    CHAR	*p;
+
+    i = 0;
+    do {
+	p = &Line[Point];
+	for ( ; Point < End && (*p == ' ' || !isalnum(*p)); Point++, p++)
+	    if (move == CSmove)
+		right(CSstay);
+
+	for (; Point < End && isalnum(*p); Point++, p++)
+	    if (move == CSmove)
+		right(CSstay);
+
+	if (Point == End)
+	    break;
+    } while (++i < Repeat);
+
+    return CSstay;
+}
+
+STATIC STATUS
+do_case(type)
+    CASE	type;
+{
+    int		i;
+    int		end;
+    int		count;
+    CHAR	*p;
+
+    (void)do_forward(CSstay);
+    if (OldPoint != Point) {
+	if ((count = Point - OldPoint) < 0)
+	    count = -count;
+	Point = OldPoint;
+	if ((end = Point + count) > End)
+	    end = End;
+	for (i = Point, p = &Line[i]; i < end; i++, p++) {
+	    if (type == TOupper) {
+		if (islower(*p))
+		    *p = toupper(*p);
+	    }
+	    else if (isupper(*p))
+		*p = tolower(*p);
+	    right(CSmove);
+	}
+    }
+    return CSstay;
+}
+
+STATIC STATUS
+case_down_word()
+{
+    return do_case(TOlower);
+}
+
+STATIC STATUS
+case_up_word()
+{
+    return do_case(TOupper);
+}
+
+STATIC void
+ceol()
+{
+    int		extras;
+    int		i;
+    CHAR	*p;
+
+    for (extras = 0, i = Point, p = &Line[i]; i <= End; i++, p++) {
+	TTYput(' ');
+	if (ISCTL(*p)) {
+	    TTYput(' ');
+	    extras++;
+	}
+	else if (rl_meta_chars && ISMETA(*p)) {
+	    TTYput(' ');
+	    TTYput(' ');
+	    extras += 2;
+	}
+    }
+
+    for (i += extras; i > Point; i--)
+	TTYback();
+}
+
+STATIC void
+clear_line()
+{
+    Point = -strlen(Prompt);
+    TTYput('\r');
+    ceol();
+    Point = 0;
+    End = 0;
+    Line[0] = '\0';
+}
+
+STATIC STATUS
+insert_string(p)
+    CHAR	*p;
+{
+    SIZE_T	len;
+    int		i;
+    CHAR	*new;
+    CHAR	*q;
+
+    len = strlen((char *)p);
+    if (End + len >= Length) {
+	if ((new = NEW(CHAR, Length + len + MEM_INC)) == NULL)
+	    return CSstay;
+	if (Length) {
+	    COPYFROMTO(new, Line, Length);
+	    DISPOSE(Line);
+	}
+	Line = new;
+	Length += len + MEM_INC;
+    }
+
+    for (q = &Line[Point], i = End - Point; --i >= 0; )
+	q[len + i] = q[i];
+    COPYFROMTO(&Line[Point], p, len);
+    End += len;
+    Line[End] = '\0';
+    TTYstring(&Line[Point]);
+    Point += len;
+
+    return Point == End ? CSstay : CSmove;
+}
+
+STATIC STATUS
+redisplay()
+{
+    TTYputs((CONST CHAR *)NEWLINE);
+    TTYputs((CONST CHAR *)Prompt);
+    TTYstring(Line);
+    return CSmove;
+}
+
+STATIC STATUS
+toggle_meta_mode()
+{
+    rl_meta_chars = ! rl_meta_chars;
+    return redisplay();
+}
+
+
+STATIC CHAR *
+next_hist()
+{
+    return H.Pos >= H.Size - 1 ? NULL : H.Lines[++H.Pos];
+}
+
+STATIC CHAR *
+prev_hist()
+{
+    return H.Pos == 0 ? NULL : H.Lines[--H.Pos];
+}
+
+STATIC STATUS
+do_insert_hist(p)
+    CHAR	*p;
+{
+    if (p == NULL)
+	return ring_bell();
+    Point = 0;
+    reposition();
+    ceol();
+    End = 0;
+    return insert_string(p);
+}
+
+STATIC STATUS
+do_hist(move)
+    CHAR	*(*move)();
+{
+    CHAR	*p;
+    int		i;
+
+    i = 0;
+    do {
+	if ((p = (*move)()) == NULL)
+	    return ring_bell();
+    } while (++i < Repeat);
+    return do_insert_hist(p);
+}
+
+STATIC STATUS
+h_next()
+{
+    return do_hist(next_hist);
+}
+
+STATIC STATUS
+h_prev()
+{
+    return do_hist(prev_hist);
+}
+
+STATIC STATUS
+h_first()
+{
+    return do_insert_hist(H.Lines[H.Pos = 0]);
+}
+
+STATIC STATUS
+h_last()
+{
+    return do_insert_hist(H.Lines[H.Pos = H.Size - 1]);
+}
+
+/*
+**  Return zero if pat appears as a substring in text.
+*/
+STATIC int
+substrcmp(text, pat, len)
+    char	*text;
+    char	*pat;
+    int		len;
+{
+    char	c;
+
+    if ((c = *pat) == '\0')
+        return *text == '\0';
+    for ( ; *text; text++)
+        if (*text == c && strncmp(text, pat, len) == 0)
+            return 0;
+    return 1;
+}
+
+STATIC CHAR *
+search_hist(search, move)
+    CHAR	*search;
+    CHAR	*(*move)();
+{
+    static CHAR	*old_search;
+    int		len;
+    int		pos;
+    int		(*match)();
+    char	*pat;
+
+    /* Save or get remembered search pattern. */
+    if (search && *search) {
+	if (old_search)
+	    DISPOSE(old_search);
+	old_search = (CHAR *)strdup((char *)search);
+    }
+    else {
+	if (old_search == NULL || *old_search == '\0')
+            return NULL;
+	search = old_search;
+    }
+
+    /* Set up pattern-finder. */
+    if (*search == '^') {
+	match = strncmp;
+	pat = (char *)(search + 1);
+    }
+    else {
+	match = substrcmp;
+	pat = (char *)search;
+    }
+    len = strlen(pat);
+
+    for (pos = H.Pos; (*move)() != NULL; )
+	if ((*match)((char *)H.Lines[H.Pos], pat, len) == 0)
+            return H.Lines[H.Pos];
+    H.Pos = pos;
+    return NULL;
+}
+
+STATIC STATUS
+h_search()
+{
+    static int	Searching;
+    CONST char	*old_prompt;
+    CHAR	*(*move)();
+    CHAR	*p;
+
+    if (Searching)
+	return ring_bell();
+    Searching = 1;
+
+    clear_line();
+    old_prompt = Prompt;
+    Prompt = "Search: ";
+    TTYputs((CONST CHAR *)Prompt);
+    move = Repeat == NO_ARG ? prev_hist : next_hist;
+    p = editinput();
+    Prompt = old_prompt;
+    Searching = 0;
+    TTYputs((CONST CHAR *)Prompt);
+    if (p == NULL && Signal > 0) {
+	Signal = 0;
+	clear_line();
+	return redisplay();
+    }
+    p = search_hist(p, move);
+    clear_line();
+    if (p == NULL) {
+	(void)ring_bell();
+	return redisplay();
+    }
+    return do_insert_hist(p);
+}
+
+STATIC STATUS
+fd_char()
+{
+    int		i;
+
+    i = 0;
+    do {
+	if (Point >= End)
+	    break;
+	right(CSmove);
+    } while (++i < Repeat);
+    return CSstay;
+}
+
+STATIC void
+save_yank(begin, i)
+    int		begin;
+    int		i;
+{
+    if (Yanked) {
+	DISPOSE(Yanked);
+	Yanked = NULL;
+    }
+
+    if (i < 1)
+	return;
+
+    if ((Yanked = NEW(CHAR, (SIZE_T)i + 1)) != NULL) {
+	COPYFROMTO(Yanked, &Line[begin], i);
+	Yanked[i] = '\0';
+    }
+}
+
+STATIC STATUS
+delete_string(count)
+    int		count;
+{
+    int		i;
+    CHAR	*p;
+
+    if (count <= 0 || End == Point)
+	return ring_bell();
+
+    if (count == 1 && Point == End - 1) {
+	/* Optimize common case of delete at end of line. */
+	End--;
+	p = &Line[Point];
+	i = 1;
+	TTYput(' ');
+	if (ISCTL(*p)) {
+	    i = 2;
+	    TTYput(' ');
+	}
+	else if (rl_meta_chars && ISMETA(*p)) {
+	    i = 3;
+	    TTYput(' ');
+	    TTYput(' ');
+	}
+	TTYbackn(i);
+	*p = '\0';
+	return CSmove;
+    }
+    if (Point + count > End && (count = End - Point) <= 0)
+	return CSstay;
+
+    if (count > 1)
+	save_yank(Point, count);
+
+    for (p = &Line[Point], i = End - (Point + count) + 1; --i >= 0; p++)
+	p[0] = p[count];
+    ceol();
+    End -= count;
+    TTYstring(&Line[Point]);
+    return CSmove;
+}
+
+STATIC STATUS
+bk_char()
+{
+    int		i;
+
+    i = 0;
+    do {
+	if (Point == 0)
+	    break;
+	left(CSmove);
+    } while (++i < Repeat);
+
+    return CSstay;
+}
+
+STATIC STATUS
+bk_del_char()
+{
+    int		i;
+
+    i = 0;
+    do {
+	if (Point == 0)
+	    break;
+	left(CSmove);
+    } while (++i < Repeat);
+
+    return delete_string(i);
+}
+
+STATIC STATUS
+kill_line()
+{
+    int		i;
+
+    if (Repeat != NO_ARG) {
+	if (Repeat < Point) {
+	    i = Point;
+	    Point = Repeat;
+	    reposition();
+	    (void)delete_string(i - Point);
+	}
+	else if (Repeat > Point) {
+	    right(CSmove);
+	    (void)delete_string(Repeat - Point - 1);
+	}
+	return CSmove;
+    }
+
+    save_yank(Point, End - Point);
+    Line[Point] = '\0';
+    ceol();
+    End = Point;
+    return CSstay;
+}
+
+STATIC STATUS
+insert_char(c)
+    int		c;
+{
+    STATUS	s;
+    CHAR	buff[2];
+    CHAR	*p;
+    CHAR	*q;
+    int		i;
+
+    if (Repeat == NO_ARG || Repeat < 2) {
+	buff[0] = c;
+	buff[1] = '\0';
+	return insert_string(buff);
+    }
+
+    if ((p = NEW(CHAR, Repeat + 1)) == NULL)
+	return CSstay;
+    for (i = Repeat, q = p; --i >= 0; )
+	*q++ = c;
+    *q = '\0';
+    Repeat = 0;
+    s = insert_string(p);
+    DISPOSE(p);
+    return s;
+}
+
+STATIC STATUS
+meta()
+{
+    unsigned int	c;
+    CONST KEYMAP	*kp;
+
+    if ((int)(c = TTYget()) == EOF)
+	return CSeof;
+#if	defined(ANSI_ARROWS)
+    /* Also include VT-100 arrows. */
+    if (c == '[' || c == 'O')
+	switch (c = TTYget()) {
+	default:	return ring_bell();
+	case EOF:	return CSeof;
+	case 'A':	return h_prev();
+	case 'B':	return h_next();
+	case 'C':	return fd_char();
+	case 'D':	return bk_char();
+	}
+#endif	/* defined(ANSI_ARROWS) */
+
+    if (isdigit(c)) {
+	for (Repeat = c - '0'; (int)(c = TTYget()) != EOF && isdigit(c); )
+	    Repeat = Repeat * 10 + c - '0';
+	Pushed = 1;
+	PushBack = c;
+	return CSstay;
+    }
+
+    if (isupper(c))
+	return do_macro(c);
+    for (OldPoint = Point, kp = MetaMap; kp->Function; kp++)
+	if (kp->Key == c)
+	    return (*kp->Function)();
+
+    return ring_bell();
+}
+
+STATIC STATUS
+emacs(c)
+    unsigned int	c;
+{
+    STATUS		s;
+    const KEYMAP	*kp;
+
+    if (rl_meta_chars && ISMETA(c)) {
+	Pushed = 1;
+	PushBack = UNMETA(c);
+	return meta();
+    }
+    for (kp = Map; kp->Function; kp++)
+	if (kp->Key == c)
+	    break;
+    s = kp->Function ? (*kp->Function)() : insert_char((int)c);
+    if (!Pushed)
+	/* No pushback means no repeat count; hacky, but true. */
+	Repeat = NO_ARG;
+    return s;
+}
+
+STATIC STATUS
+TTYspecial(c)
+    unsigned int	c;
+{
+    if (ISMETA(c))
+	return CSdispatch;
+
+    if (c == rl_erase || (int)c == DEL)
+	return bk_del_char();
+    if (c == rl_kill) {
+	if (Point != 0) {
+	    Point = 0;
+	    reposition();
+	}
+	Repeat = NO_ARG;
+	return kill_line();
+    }
+    if (c == rl_eof && Point == 0 && End == 0)
+	return CSeof;
+    if (c == rl_intr) {
+	Signal = SIGINT;
+	return CSsignal;
+    }
+    if (c == rl_quit) {
+	Signal = SIGQUIT;
+	return CSeof;
+    }
+
+    return CSdispatch;
+}
+
+STATIC CHAR *
+editinput()
+{
+    unsigned int	c;
+
+    Repeat = NO_ARG;
+    OldPoint = Point = Mark = End = 0;
+    Line[0] = '\0';
+
+    Signal = -1;
+    while ((int)(c = TTYget()) != EOF)
+	switch (TTYspecial(c)) {
+	case CSdone:
+	    return Line;
+	case CSeof:
+	    return NULL;
+	case CSsignal:
+	    return (CHAR *)"";
+	case CSmove:
+	    reposition();
+	    break;
+	case CSdispatch:
+	    switch (emacs(c)) {
+	    case CSdone:
+		return Line;
+	    case CSeof:
+		return NULL;
+	    case CSsignal:
+		return (CHAR *)"";
+	    case CSmove:
+		reposition();
+		break;
+	    case CSdispatch:
+	    case CSstay:
+		break;
+	    }
+	    break;
+	case CSstay:
+	    break;
+	}
+    if (strlen((char *)Line))
+        return Line;
+    free(Line);
+    return NULL;
+}
+
+STATIC void
+hist_add(p)
+    CHAR	*p;
+{
+    int		i;
+
+    if ((p = (CHAR *)strdup((char *)p)) == NULL)
+	return;
+    if (H.Size < HIST_SIZE)
+	H.Lines[H.Size++] = p;
+    else {
+	DISPOSE(H.Lines[0]);
+	for (i = 0; i < HIST_SIZE - 1; i++)
+	    H.Lines[i] = H.Lines[i + 1];
+	H.Lines[i] = p;
+    }
+    H.Pos = H.Size - 1;
+}
+
+/*
+**  For compatibility with FSF readline.
+*/
+/* ARGSUSED0 */
+void
+rl_reset_terminal(p)
+    char	*p;
+{
+    (void)p;
+}
+
+void
+rl_initialize()
+{
+}
+
+char *
+readline(prompt)
+    CONST char	*prompt;
+{
+    CHAR	*line;
+    int		s;
+
+    if (Line == NULL) {
+	Length = MEM_INC;
+	if ((Line = NEW(CHAR, Length)) == NULL)
+	    return NULL;
+    }
+
+    TTYinfo();
+    rl_ttyset(0);
+    hist_add(NIL);
+    ScreenSize = SCREEN_INC;
+    Screen = NEW(char, ScreenSize);
+    Prompt = prompt ? prompt : (char *)NIL;
+    TTYputs((CONST CHAR *)Prompt);
+    if ((line = editinput()) != NULL) {
+	line = (CHAR *)strdup((char *)line);
+	TTYputs((CONST CHAR *)NEWLINE);
+	TTYflush();
+    }
+    rl_ttyset(1);
+    DISPOSE(Screen);
+    DISPOSE(H.Lines[--H.Size]);
+    if (Signal > 0) {
+	s = Signal;
+	Signal = 0;
+	(void)kill(getpid(), s);
+    }
+    return (char *)line;
+}
+
+void
+add_history(p)
+    char	*p;
+{
+    if (p == NULL || *p == '\0')
+	return;
+
+#if	defined(UNIQUE_HISTORY)
+    if (H.Size && strcmp(p, (char *)H.Lines[H.Size - 1]) == 0)
+        return;
+#endif	/* defined(UNIQUE_HISTORY) */
+    hist_add((CHAR *)p);
+}
+
+
+STATIC STATUS
+beg_line()
+{
+    if (Point) {
+	Point = 0;
+	return CSmove;
+    }
+    return CSstay;
+}
+
+STATIC STATUS
+del_char()
+{
+    return delete_string(Repeat == NO_ARG ? 1 : Repeat);
+}
+
+STATIC STATUS
+end_line()
+{
+    if (Point != End) {
+	Point = End;
+	return CSmove;
+    }
+    return CSstay;
+}
+
+STATIC STATUS
+accept_line()
+{
+    Line[End] = '\0';
+    return CSdone;
+}
+
+STATIC STATUS
+transpose()
+{
+    CHAR	c;
+
+    if (Point) {
+	if (Point == End)
+	    left(CSmove);
+	c = Line[Point - 1];
+	left(CSstay);
+	Line[Point - 1] = Line[Point];
+	TTYshow(Line[Point - 1]);
+	Line[Point++] = c;
+	TTYshow(c);
+    }
+    return CSstay;
+}
+
+STATIC STATUS
+quote()
+{
+    unsigned int	c;
+
+    return (int)(c = TTYget()) == EOF ? CSeof : insert_char((int)c);
+}
+
+STATIC STATUS
+wipe()
+{
+    int		i;
+
+    if (Mark > End)
+	return ring_bell();
+
+    if (Point > Mark) {
+	i = Point;
+	Point = Mark;
+	Mark = i;
+	reposition();
+    }
+
+    return delete_string(Mark - Point);
+}
+
+STATIC STATUS
+mk_set()
+{
+    Mark = Point;
+    return CSstay;
+}
+
+STATIC STATUS
+exchange()
+{
+    unsigned int	c;
+
+    if ((c = TTYget()) != CTL('X'))
+	return (int)c == EOF ? CSeof : ring_bell();
+
+    if ((int)(c = Mark) <= End) {
+	Mark = Point;
+	Point = c;
+	return CSmove;
+    }
+    return CSstay;
+}
+
+STATIC STATUS
+yank()
+{
+    if (Yanked && *Yanked)
+	return insert_string(Yanked);
+    return CSstay;
+}
+
+STATIC STATUS
+copy_region()
+{
+    if (Mark > End)
+	return ring_bell();
+
+    if (Point > Mark)
+	save_yank(Mark, Point - Mark);
+    else
+	save_yank(Point, Mark - Point);
+
+    return CSstay;
+}
+
+STATIC STATUS
+move_to_char()
+{
+    unsigned int	c;
+    int			i;
+    CHAR		*p;
+
+    if ((int)(c = TTYget()) == EOF)
+	return CSeof;
+    for (i = Point + 1, p = &Line[i]; i < End; i++, p++)
+	if (*p == c) {
+	    Point = i;
+	    return CSmove;
+	}
+    return CSstay;
+}
+
+STATIC STATUS
+fd_word()
+{
+    return do_forward(CSmove);
+}
+
+STATIC STATUS
+fd_kill_word()
+{
+    int		i;
+
+    (void)do_forward(CSstay);
+    if (OldPoint != Point) {
+	i = Point - OldPoint;
+	Point = OldPoint;
+	return delete_string(i);
+    }
+    return CSstay;
+}
+
+STATIC STATUS
+bk_word()
+{
+    int		i;
+    CHAR	*p;
+
+    i = 0;
+    do {
+	for (p = &Line[Point]; p > Line && !isalnum(p[-1]); p--)
+	    left(CSmove);
+
+	for (; p > Line && p[-1] != ' ' && isalnum(p[-1]); p--)
+	    left(CSmove);
+
+	if (Point == 0)
+	    break;
+    } while (++i < Repeat);
+
+    return CSstay;
+}
+
+STATIC STATUS
+bk_kill_word()
+{
+    (void)bk_word();
+    if (OldPoint != Point)
+	return delete_string(OldPoint - Point);
+    return CSstay;
+}
+
+STATIC int
+argify(line, avp)
+    CHAR	*line;
+    CHAR	***avp;
+{
+    CHAR	*c;
+    CHAR	**p;
+    CHAR	**new;
+    int		ac;
+    int		i;
+
+    i = MEM_INC;
+    if ((*avp = p = NEW(CHAR*, i))== NULL)
+	 return 0;
+
+    for (c = line; isspace(*c); c++)
+	continue;
+    if (*c == '\n' || *c == '\0')
+	return 0;
+
+    for (ac = 0, p[ac++] = c; *c && *c != '\n'; ) {
+	if (isspace(*c)) {
+	    *c++ = '\0';
+	    if (*c && *c != '\n') {
+		if (ac + 1 == i) {
+		    new = NEW(CHAR*, i + MEM_INC);
+		    if (new == NULL) {
+			p[ac] = NULL;
+			return ac;
+		    }
+		    COPYFROMTO(new, p, i * sizeof (char **));
+		    i += MEM_INC;
+		    DISPOSE(p);
+		    *avp = p = new;
+		}
+		p[ac++] = c;
+	    }
+	}
+	else
+	    c++;
+    }
+    *c = '\0';
+    p[ac] = NULL;
+    return ac;
+}
+
+STATIC STATUS
+last_argument()
+{
+    CHAR	**av;
+    CHAR	*p;
+    STATUS	s;
+    int		ac;
+
+    if (H.Size == 1 || (p = H.Lines[H.Size - 2]) == NULL)
+	return ring_bell();
+
+    if ((p = (CHAR *)strdup((char *)p)) == NULL)
+	return CSstay;
+    ac = argify(p, &av);
+
+    if (Repeat != NO_ARG)
+	s = Repeat < ac ? insert_string(av[Repeat]) : ring_bell();
+    else
+	s = ac ? insert_string(av[ac - 1]) : CSstay;
+
+    if (ac)
+	DISPOSE(av);
+    DISPOSE(p);
+    return s;
+}
+
+STATIC CONST KEYMAP Map[32] = {
+    {	CTL('@'),	ring_bell	},
+    {	CTL('A'),	beg_line	},
+    {	CTL('B'),	bk_char		},
+    {	CTL('D'),	del_char	},
+    {	CTL('E'),	end_line	},
+    {	CTL('F'),	fd_char		},
+    {	CTL('G'),	ring_bell	},
+    {	CTL('H'),	bk_del_char	},
+    {	CTL('J'),	accept_line	},
+    {	CTL('K'),	kill_line	},
+    {	CTL('L'),	redisplay	},
+    {	CTL('M'),	accept_line	},
+    {	CTL('N'),	h_next		},
+    {	CTL('O'),	ring_bell	},
+    {	CTL('P'),	h_prev		},
+    {	CTL('Q'),	ring_bell	},
+    {	CTL('R'),	h_search	},
+    {	CTL('S'),	ring_bell	},
+    {	CTL('T'),	transpose	},
+    {	CTL('U'),	ring_bell	},
+    {	CTL('V'),	quote		},
+    {	CTL('W'),	wipe		},
+    {	CTL('X'),	exchange	},
+    {	CTL('Y'),	yank		},
+    {	CTL('Z'),	ring_bell	},
+    {	CTL('['),	meta		},
+    {	CTL(']'),	move_to_char	},
+    {	CTL('^'),	ring_bell	},
+    {	CTL('_'),	ring_bell	},
+    {	0,		NULL		}
+};
+
+STATIC CONST KEYMAP MetaMap[16]= {
+    {	CTL('H'),	bk_kill_word	},
+    {	DEL,		bk_kill_word	},
+    {	' ',		mk_set		},
+    {	'.',		last_argument	},
+    {	'<',		h_first		},
+    {	'>',		h_last		},
+    {	'b',		bk_word		},
+    {	'd',		fd_kill_word	},
+    {	'f',		fd_word		},
+    {	'l',		case_down_word	},
+    {	'm',		toggle_meta_mode },
+    {	'u',		case_up_word	},
+    {	'y',		yank		},
+    {	'w',		copy_region	},
+    {	0,		NULL		}
+};
+