The Tor Browser: js/src/editline/editline.c@6474c204b198 (annotated)

js/src/editline/editline.c@6474c204b198 (annotated)

js/src/editline/editline.c

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- 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		}
 };

The Tor Browser / annotate

js/src/editline/editline.c@6474c204b198 (annotated)

js/src/editline/editline.c