/*
 *	$Xorg: misc.c,v 1.3 2000/08/17 19:55:09 cpqbld Exp $
 */

/* $XFree86: xc/programs/xterm/misc.c,v 3.66 2001/10/24 01:21:24 dickey Exp $ */

/*
 *
 * Copyright 1999,2000,2001 by Thomas E. Dickey
 *
 *                        All Rights Reserved
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * Except as contained in this notice, the name(s) of the above copyright
 * holders shall not be used in advertising or otherwise to promote the
 * sale, use or other dealings in this Software without prior written
 * authorization.
 *
 *
 * Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
 *
 *                         All Rights Reserved
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose and without fee is hereby granted,
 * provided that the above copyright notice appear in all copies and that
 * both that copyright notice and this permission notice appear in
 * supporting documentation, and that the name of Digital Equipment
 * Corporation not be used in advertising or publicity pertaining to
 * distribution of the software without specific, written prior permission.
 *
 *
 * DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
 * ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
 * DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
 * ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
 * WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
 * ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */

#include <xterm.h>

#include <sys/stat.h>
#include <stdio.h>
#include <signal.h>
#include <ctype.h>
#include <pwd.h>
#include <sys/wait.h>

#include <X11/Xatom.h>
#include <X11/cursorfont.h>

#include <X11/Shell.h>
#include <X11/Xmu/Error.h>
#include <X11/Xmu/SysUtil.h>
#include <X11/Xmu/WinUtil.h>
#if HAVE_X11_SUNKEYSYM_H
#include <X11/Sunkeysym.h>
#endif

#include <data.h>
#include <error.h>
#include <menu.h>
#include <fontutils.h>
#include <xcharmouse.h>
#include <xstrings.h>
#include <VTparse.h>

#if (XtSpecificationRelease < 6)
#ifndef X_GETTIMEOFDAY
#define X_GETTIMEOFDAY(t) gettimeofday(t,(struct timezone *)0)
#endif
#endif

#ifdef AMOEBA
#include <amoeba.h>
#include <module/proc.h>
#endif

#ifdef __EMX__
#define environ gblenvp		/* circumvent a bug */
#endif

#ifdef VMS
#define XTERM_VMS_LOGFILE "SYS$SCRATCH:XTERM_LOG.TXT"
#ifdef ALLOWLOGFILEEXEC
#undef ALLOWLOGFILEEXEC
#endif
#endif /* VMS */

extern char **environ;		/* used in 'xtermSetenv()' */

#if OPT_TEK4014
#define OUR_EVENT(event,Type) \
		(event.type == Type && \
		  (event.xcrossing.window == XtWindow(XtParent(term)) || \
		    (tekWidget && \
		     event.xcrossing.window == XtWindow(XtParent(tekWidget)))))
#else
#define OUR_EVENT(event,Type) \
		(event.type == Type && \
		   (event.xcrossing.window == XtWindow(XtParent(term))))
#endif

static Boolean ChangeColorsRequest (XtermWidget pTerm, int start, char *names, int final);
static void DoSpecialEnterNotify (XEnterWindowEvent *ev);
static void DoSpecialLeaveNotify (XEnterWindowEvent *ev);
static void selectwindow (TScreen *screen, int flag);
static void unselectwindow (TScreen *screen, int flag);

void
do_xevents(void)
{
	register TScreen *screen = &term->screen;

	if (XtAppPending(app_con)
	||
#if defined(VMS) || defined(__VMS)
	screen->display->qlen > 0
#else
	GetBytesAvailable (ConnectionNumber(screen->display)) > 0
#endif
	)
	xevents();
}

void
xevents(void)
{
	XEvent event;
	XtInputMask input_mask;
	register TScreen *screen = &term->screen;

	if(screen->scroll_amt)
		FlushScroll(screen);
	/*
	 * process timeouts, relying on the fact that XtAppProcessEvent
	 * will process the timeout and return without blockng on the
	 * XEvent queue.  Other sources i.e. the pty are handled elsewhere
	 * with select().
	 */
	while ((input_mask = XtAppPending(app_con)) & XtIMTimer)
		XtAppProcessEvent(app_con, XtIMTimer);
	/*
	 * If there's no XEvents, don't wait around...
	 */
	if ((input_mask & XtIMXEvent) != XtIMXEvent)
	    return;
	do {
		if (waitingForTrackInfo)
			return;
		XtAppNextEvent (app_con, &event);
		/*
		 * Hack to get around problems with the toolkit throwing away
		 * eventing during the exclusive grab of the menu popup.  By
		 * looking at the event ourselves we make sure that we can
		 * do the right thing.
		 */
		if(OUR_EVENT(event, EnterNotify))
		  DoSpecialEnterNotify (&event.xcrossing);
		else
		if(OUR_EVENT(event, LeaveNotify))
		  DoSpecialLeaveNotify (&event.xcrossing);
		else if ((screen->send_mouse_pos == ANY_EVENT_MOUSE
#if OPT_DEC_LOCATOR
			|| screen->send_mouse_pos == DEC_LOCATOR
#endif	/* OPT_DEC_LOCATOR */
								)
		 && event.xany.type == MotionNotify
		 && event.xcrossing.window == XtWindow(term)) {
		    SendMousePosition((Widget)term, &event);
		    continue;
		}

		if (!event.xany.send_event ||
		    screen->allowSendEvents ||
		    ((event.xany.type != KeyPress) &&
		     (event.xany.type != KeyRelease) &&
		     (event.xany.type != ButtonPress) &&
		     (event.xany.type != ButtonRelease)))
		    XtDispatchEvent(&event);
	} while ((input_mask = XtAppPending(app_con)) & XtIMXEvent);
}


Cursor make_colored_cursor (
	unsigned cursorindex,			/* index into font */
	unsigned long fg,			/* pixel value */
	unsigned long bg)			/* pixel value */
{
	register TScreen *screen = &term->screen;
	Cursor c;
	register Display *dpy = screen->display;

	c = XCreateFontCursor (dpy, cursorindex);
	if (c == (Cursor) 0) return (c);

	recolor_cursor (c, fg, bg);
	return (c);
}

/* ARGSUSED */
void HandleKeyPressed(
	Widget w GCC_UNUSED,
	XEvent *event,
	String *params GCC_UNUSED,
	Cardinal *nparams GCC_UNUSED)
{
    register TScreen *screen = &term->screen;

#ifdef ACTIVEWINDOWINPUTONLY
    if (w == CURRENT_EMU(screen))
#endif
	Input (&term->keyboard, screen, &event->xkey, False);
}

/* ARGSUSED */
void HandleEightBitKeyPressed(
	Widget w GCC_UNUSED,
	XEvent *event,
	String *params GCC_UNUSED,
	Cardinal *nparams GCC_UNUSED)
{
    register TScreen *screen = &term->screen;

#ifdef ACTIVEWINDOWINPUTONLY
    if (w == CURRENT_EMU(screen))
#endif
	Input (&term->keyboard, screen, &event->xkey, True);
}

/* ARGSUSED */
void HandleStringEvent(
	Widget w GCC_UNUSED,
	XEvent *event GCC_UNUSED,
	String *params,
	Cardinal *nparams)
{
    register TScreen *screen = &term->screen;

#ifdef ACTIVEWINDOWINPUTONLY
    if (w != CURRENT_EMU(screen))
	return;
#endif

    if (*nparams != 1) return;

    if ((*params)[0] == '0' && (*params)[1] == 'x' && (*params)[2] != '\0') {
	Char c, *p;
	Char hexval[2];
	hexval[0] = hexval[1] = 0;
	for (p = (Char *)(*params+2); (c = *p); p++) {
	    hexval[0] *= 16;
	    if (isupper(c)) c = tolower(c);
	    if (c >= '0' && c <= '9')
		hexval[0] += c - '0';
	    else if (c >= 'a' && c <= 'f')
		hexval[0] += c - 'a' + 10;
	    else break;
	}
	if (c == '\0')
	    StringInput (screen, hexval, 1);
    }
    else {
	StringInput (screen, (Char *)*params, strlen(*params));
    }
}

/*
 * Rather than sending characters to the host, put them directly into our
 * input queue.  That lets a user have access to any of the control sequences
 * for a key binding.  This is the equivalent of local function key support.
 *
 * NOTE:  This code does not support the hexadecimal kludge used in
 * HandleStringEvent because it prevents us from sending an arbitrary string
 * (but it appears in a lot of examples - so we are stuck with it).  The
 * standard string converter does recognize "\" for newline ("\n") and for
 * octal constants (e.g., "\007" for BEL).  So we assume the user can make do
 * without a specialized converter.  (Don't try to use \000, though).
 */
/* ARGSUSED */
void HandleInterpret(
	Widget w GCC_UNUSED,
	XEvent *event GCC_UNUSED,
	String *params,
	Cardinal *param_count)
{
    if (*param_count == 1) {
	char *value = params[0];
	int need = strlen(value);
	int used = usedPtyData(&VTbuffer);
	int have = (VTbuffer.cnt >= 0) ? VTbuffer.cnt : 0;
	int n;

	if (have - used + need < BUF_SIZE) {

	    FlushLog(&term->screen);

	    if (have != 0
	     && used < have) {
		memmove(VTbuffer.ptr + (need - used),
			VTbuffer.ptr,
			VTbuffer.cnt * sizeof(*VTbuffer.ptr));
	    } else {
		initPtyData(&VTbuffer);
		used = 0;
	    }

	    VTbuffer.cnt += (need - used);
	    VTbuffer.ptr -= used;
	    for (n = 0; n < need; n++)
		VTbuffer.ptr[n] = CharOf(value[n]);
	}
    }
}

static void DoSpecialEnterNotify (register XEnterWindowEvent *ev)
{
    register TScreen *screen = &term->screen;

#ifdef ACTIVEWINDOWINPUTONLY
    if (ev->window == XtWindow(XtParent(CURRENT_EMU(screen))))
#endif
      if (((ev->detail) != NotifyInferior) &&
	  ev->focus &&
	  !(screen->select & FOCUS))
	selectwindow(screen, INWINDOW);
}

/*ARGSUSED*/
void HandleEnterWindow(
	Widget w GCC_UNUSED,
	XtPointer eventdata GCC_UNUSED,
	XEvent *event GCC_UNUSED,
	Boolean *cont GCC_UNUSED)
{
    /* NOP since we handled it above */
}


static void DoSpecialLeaveNotify (register XEnterWindowEvent *ev)
{
    register TScreen *screen = &term->screen;

#ifdef ACTIVEWINDOWINPUTONLY
    if (ev->window == XtWindow(XtParent(CURRENT_EMU(screen))))
#endif
      if (((ev->detail) != NotifyInferior) &&
	  ev->focus &&
	  !(screen->select & FOCUS))
	unselectwindow(screen, INWINDOW);
}


/*ARGSUSED*/
void HandleLeaveWindow(
	Widget w GCC_UNUSED,
	XtPointer eventdata GCC_UNUSED,
	XEvent *event GCC_UNUSED,
	Boolean *cont GCC_UNUSED)
{
    /* NOP since we handled it above */
}


/*ARGSUSED*/
void HandleFocusChange(
	Widget w GCC_UNUSED,
	XtPointer eventdata GCC_UNUSED,
	XEvent *ev,
	Boolean *cont GCC_UNUSED)
{
	register XFocusChangeEvent *event = (XFocusChangeEvent  *)ev;
	register TScreen *screen = &term->screen;

	if(event->type == FocusIn)
		selectwindow(screen,
			     (event->detail == NotifyPointer) ? INWINDOW :
								FOCUS);
	else {
		unselectwindow(screen,
			       (event->detail == NotifyPointer) ? INWINDOW :
								  FOCUS);
		if (screen->grabbedKbd && (event->mode == NotifyUngrab)) {
		    Bell(XkbBI_Info, 100);
		    ReverseVideo(term);
		    screen->grabbedKbd = FALSE;
		    update_securekbd();
		}
	}
}


static void
selectwindow(register TScreen *screen, register int flag)
{
#if OPT_TEK4014
	if(screen->TekEmu) {
		if(!Ttoggled)
			TCursorToggle(TOGGLE);
		screen->select |= flag;
		if(!Ttoggled)
			TCursorToggle(TOGGLE);
		return;
	} else
#endif
	{
		if (screen->xic)
		    XSetICFocus(screen->xic);

		if(screen->cursor_state &&
		   (screen->cursor_col != screen->cur_col ||
		    screen->cursor_row != screen->cur_row))
		    HideCursor();
		screen->select |= flag;
		if(screen->cursor_state)
			ShowCursor();
		return;
	}
}

static void
unselectwindow(register TScreen *screen, register int flag)
{
    if (screen->always_highlight) return;

#if OPT_TEK4014
    if(screen->TekEmu) {
	if(!Ttoggled) TCursorToggle(TOGGLE);
	screen->select &= ~flag;
	if(!Ttoggled) TCursorToggle(TOGGLE);
    } else
#endif
    {
	if (screen->xic)
	    XUnsetICFocus(screen->xic);
	screen->select &= ~flag;
	if(screen->cursor_state &&
	   (screen->cursor_col != screen->cur_col ||
	    screen->cursor_row != screen->cur_row))
	      HideCursor();
	if(screen->cursor_state)
	  ShowCursor();
    }
}

static long lastBellTime;	/* in milliseconds */

void
Bell(int which GCC_UNUSED, int percent)
{
    register TScreen *screen = &term->screen;
    struct timeval curtime;
    long now_msecs;

    TRACE(("BELL %d\n", percent));

    /* has enough time gone by that we are allowed to ring
       the bell again? */
    if(screen->bellSuppressTime) {
	if(screen->bellInProgress) {
	    do_xevents();
	    if(screen->bellInProgress) { /* even after new events? */
		return;
	    }
	}
	X_GETTIMEOFDAY(&curtime);
	now_msecs = 1000*curtime.tv_sec + curtime.tv_usec/1000;
	if(lastBellTime != 0  &&  now_msecs - lastBellTime >= 0  &&
	   now_msecs - lastBellTime < screen->bellSuppressTime) {
	    return;
	}
	lastBellTime = now_msecs;
    }

    if (screen->visualbell)
	VisualBell();
    else
#ifdef XKB
	XkbStdBell(screen->display,TWindow(screen),percent,which);
#else
	XBell(screen->display, percent);
#endif

    if (screen->poponbell)
	XRaiseWindow(screen->display, VShellWindow);

    if(screen->bellSuppressTime) {
	/* now we change a property and wait for the notify event to come
	   back.  If the server is suspending operations while the bell
	   is being emitted (problematic for audio bell), this lets us
	   know when the previous bell has finished */
	Widget w = CURRENT_EMU(screen);
	XChangeProperty(XtDisplay(w), XtWindow(w),
			XA_NOTICE, XA_NOTICE, 8, PropModeAppend, NULL, 0);
	screen->bellInProgress = TRUE;
    }
}

void
VisualBell(void)
{
    register TScreen *screen = &term->screen;
    register Pixel xorPixel = screen->foreground ^ term->core.background_pixel;
    XGCValues gcval;
    GC visualGC;

    gcval.function = GXxor;
    gcval.foreground = xorPixel;
    visualGC = XtGetGC((Widget)term, GCFunction+GCForeground, &gcval);
#if OPT_TEK4014
    if(screen->TekEmu) {
	XFillRectangle(
		       screen->display,
		       TWindow(screen),
		       visualGC,
		       0, 0,
		       (unsigned) TFullWidth(screen),
		       (unsigned) TFullHeight(screen));
	XFlush(screen->display);
	XFillRectangle(
		       screen->display,
		       TWindow(screen),
		       visualGC,
		       0, 0,
		       (unsigned) TFullWidth(screen),
		       (unsigned) TFullHeight(screen));
    } else
#endif
    {
	XFillRectangle(
		       screen->display,
		       VWindow(screen),
		       visualGC,
		       0, 0,
		       (unsigned) FullWidth(screen),
		       (unsigned) FullHeight(screen));
	XFlush(screen->display);
	XFillRectangle(
		       screen->display,
		       VWindow(screen),
		       visualGC,
		       0, 0,
		       (unsigned) FullWidth(screen),
		       (unsigned) FullHeight(screen));
    }
}

/* ARGSUSED */
void HandleBellPropertyChange(
	Widget w GCC_UNUSED,
	XtPointer data GCC_UNUSED,
	XEvent *ev,
	Boolean *more GCC_UNUSED)
{
    register TScreen *screen = &term->screen;

    if (ev->xproperty.atom == XA_NOTICE) {
	screen->bellInProgress = FALSE;
    }
}


#if OPT_MAXIMIZE
/*ARGSUSED*/
void HandleDeIconify (
    Widget gw,
    XEvent *event GCC_UNUSED,
    String *params GCC_UNUSED,
    Cardinal *nparams GCC_UNUSED)
{
    if (IsXtermWidget(gw)) {
	register TScreen *screen = &((XtermWidget)gw)->screen;
	XMapWindow(screen->display, VShellWindow);
    }
}

/*ARGSUSED*/
void HandleIconify (
    Widget gw,
    XEvent *event GCC_UNUSED,
    String *params GCC_UNUSED,
    Cardinal *nparams GCC_UNUSED)
{
    if (IsXtermWidget(gw)) {
	register TScreen *screen = &((XtermWidget)gw)->screen;
	XIconifyWindow(screen->display,
		       VShellWindow,
		       DefaultScreen(screen->display));
    }
}

int QueryMaximize(TScreen *screen, unsigned *width, unsigned *height)
{
    XSizeHints hints;
    long supp = 0;
    Window root_win;
    int root_x = -1;		/* saved co-ordinates */
    int root_y = -1;
    unsigned root_border;
    unsigned root_depth;

    if (XGetGeometry(screen->display,
		    XDefaultRootWindow(screen->display),
		    &root_win,
		    &root_x,
		    &root_y,
		    width,
		    height,
		    &root_border,
		    &root_depth)) {
	TRACE(("QueryMaximize: XGetGeometry position %d,%d size %d,%d border %d\n",
		root_x,
		root_y,
		*width,
		*height,
		root_border));
	*width -= (screen->border * 2),
	*height -= (screen->border * 2);

	hints.flags = PMaxSize;
	if (XGetWMNormalHints(screen->display,
			    VShellWindow,
			    &hints,
			    &supp)
	 && (hints.flags & PMaxSize) != 0) {

	    TRACE(("QueryMaximize: WM hints max_w %#x max_h %#x\n",
		    hints.max_width,
		    hints.max_height));

	    if ((unsigned) hints.max_width < *width)
		*width = hints.max_width;
	    if ((unsigned) hints.max_height < *height)
		*height = hints.max_height;
	}
	return 1;
    }
    return 0;
}

void RequestMaximize (XtermWidget termw, int maximize)
{
    register TScreen	*screen	= &termw->screen;
    XWindowAttributes win_attrs;
    Position root_x, root_y;
    unsigned root_width, root_height;

    if (maximize) {

	if (QueryMaximize(screen, &root_width, &root_height)) {

	    if (XGetWindowAttributes(screen->display,
				     VShellWindow,
				     &win_attrs)) {
		XtTranslateCoords(toplevel, 0, 0, &root_x, &root_y);

		if (screen->restore_data != True
		 || screen->restore_width != root_width
		 || screen->restore_height != root_height) {
		    screen->restore_data = True;
		    screen->restore_x = root_x - win_attrs.x;
		    screen->restore_y = root_y - win_attrs.y;
		    screen->restore_width = win_attrs.width;
		    screen->restore_height = win_attrs.height;
		    TRACE(("HandleMaximize: save window position %d,%d size %d,%d\n",
			    screen->restore_x,
			    screen->restore_y,
			    screen->restore_width,
			    screen->restore_height));
		}

		XMoveResizeWindow(screen->display,
				  VShellWindow,
				  0, /* x */
				  0, /* y */
				  root_width,
				  root_height);
	    }
	}
    } else {
	if (screen->restore_data) {
	    TRACE(("HandleRestoreSize: position %d,%d size %d,%d\n",
		    screen->restore_x,
		    screen->restore_y,
		    screen->restore_width,
		    screen->restore_height));
	    screen->restore_data = False;
	    XMoveResizeWindow(screen->display,
			      VShellWindow,
			      screen->restore_x,
			      screen->restore_y,
			      screen->restore_width,
			      screen->restore_height);
	}
    }
}

/*ARGSUSED*/
void HandleMaximize (
    Widget gw,
    XEvent *event GCC_UNUSED,
    String *params GCC_UNUSED,
    Cardinal *nparams GCC_UNUSED)
{
    if (IsXtermWidget(gw)) {
	RequestMaximize((XtermWidget)gw, 1);
    }
}

/*ARGSUSED*/
void HandleRestoreSize (
    Widget gw,
    XEvent *event GCC_UNUSED,
    String *params GCC_UNUSED,
    Cardinal *nparams GCC_UNUSED)
{
    if (IsXtermWidget(gw)) {
	RequestMaximize((XtermWidget)gw, 0);
    }
}
#endif /* OPT_MAXIMIZE */

void
Redraw(void)
{
	register TScreen *screen = &term->screen;
	XExposeEvent event;

	event.type = Expose;
	event.display = screen->display;
	event.x = 0;
	event.y = 0;
	event.count = 0;

	if(VWindow(screen)) {
		event.window = VWindow(screen);
		event.width = term->core.width;
		event.height = term->core.height;
		(*term->core.widget_class->core_class.expose)((Widget)term, (XEvent *)&event, NULL);
		if(ScrollbarWidth(screen))
			(*screen->scrollWidget->core.widget_class->core_class.expose)(screen->scrollWidget, (XEvent *)&event, NULL);
		}

#if OPT_TEK4014
	if(TWindow(screen) && screen->Tshow) {
		event.window = TWindow(screen);
		event.width = tekWidget->core.width;
		event.height = tekWidget->core.height;
		TekExpose ((Widget)tekWidget, (XEvent *)&event, NULL);
	}
#endif
}

#ifdef VMS
#define TIMESTAMP_FMT "%s%d-%02d-%02d-%02d-%02d-%02d"
#else
#define TIMESTAMP_FMT "%s%d-%02d-%02d.%02d:%02d:%02d"
#endif

void
timestamp_filename(char *dst, const char *src)
{
    time_t tstamp;
    struct tm *tstruct;

    time(&tstamp);
    tstruct = localtime(&tstamp);
    sprintf(dst, TIMESTAMP_FMT,
	    src,
	    tstruct->tm_year + 1900,
	    tstruct->tm_mon + 1,
	    tstruct->tm_mday,
	    tstruct->tm_hour,
	    tstruct->tm_min,
	    tstruct->tm_sec);
}

int
open_userfile(int uid, int gid, char *path, Boolean append)
{
    int fd;
    struct stat sb;

#ifdef VMS
    if((fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644)) < 0) {
	fprintf(stderr, "%s: cannot open %s: %d:%s\n", xterm_name, path, errno, SysErrorMsg(errno));
	return -1;
    }
    chown(path, uid, gid);
#else
    if ((access(path, F_OK) != 0 && (errno != ENOENT))
     || (!(creat_as(uid, gid, append, path, 0644)))
     || ((fd = open(path, O_WRONLY | O_APPEND, 0644)) < 0)) {
	fprintf(stderr, "%s: cannot open %s: %d:%s\n", xterm_name, path, errno, SysErrorMsg(errno));
	return -1;
    }
#endif

    /*
     * Doublecheck that the user really owns the file that we've opened before
     * we do any damage, and that it is not world-writable.
     */
    if (fstat(fd, &sb) < 0
     || (int) sb.st_uid != uid
     || (sb.st_mode & 022) != 0) {
	fprintf(stderr, "%s: you do not own %s\n", xterm_name, path);
	close(fd);
	return -1;
    }
    return fd;
}

#ifndef VMS
/*
 * Create a file only if we could with the permissions of the real user id.
 * We could emulate this with careful use of access() and following
 * symbolic links, but that is messy and has race conditions.
 * Forking is messy, too, but we can't count on setreuid() or saved set-uids
 * being available.
 *
 * Note: When called for user logging, we have ensured that the real and
 * effective user ids are the same, so this remains as a convenience function
 * for the debug logs.
 *
 * Returns 1 if we can proceed to open the file in relative safety, 0
 * otherwise.
 */
int
creat_as(int uid, int gid, Boolean append, char *pathname, int mode)
{
    int fd;
    int pid;
    int retval = 0;
    int childstat = 0;
#ifndef HAVE_WAITPID
    int waited;
    SIGNAL_T (*chldfunc) (int);

    chldfunc = signal(SIGCHLD, SIG_DFL);
#endif /* HAVE_WAITPID */

    pid = fork();
    switch (pid)
    {
    case 0:			/* child */
	setgid(gid);
	setuid(uid);
	fd = open(pathname, O_WRONLY|O_CREAT|(append ? O_APPEND : O_EXCL), mode);
	if (fd >= 0) {
	    close(fd);
	    _exit(0);
	} else
	    _exit(1);
	/* NOTREACHED */
    case -1:			/* error */
	return retval;
    default:			/* parent */
#ifdef HAVE_WAITPID
	while (waitpid(pid, &childstat, 0) < 0) {
#ifdef EINTR
	    if (errno == EINTR)
		continue;
#endif /* EINTR */
#ifdef ERESTARTSYS
	    if (errno == ERESTARTSYS)
		continue;
#endif /* ERESTARTSYS */
	    break;
	}
#else  /* HAVE_WAITPID */
	waited = wait(&childstat);
	signal(SIGCHLD, chldfunc);
	/*
	  Since we had the signal handler uninstalled for a while,
	  we might have missed the termination of our screen child.
	  If we can check for this possibility without hanging, do so.
	*/
	do
	    if (waited == term->screen.pid)
		Cleanup(0);
	while ( (waited=nonblocking_wait()) > 0);
#endif /* HAVE_WAITPID */
#ifndef WIFEXITED
#define WIFEXITED(status) ((status & 0xff) != 0)
#endif
	if (WIFEXITED(childstat)) retval = 1;
	return retval;
    }
}
#endif /* !VMS */

#ifdef ALLOWLOGGING

/*
 * Logging is a security hole, since it allows a setuid program to write
 * arbitrary data to an arbitrary file.  So it is disabled by default.
 */

#ifdef ALLOWLOGFILEEXEC
static SIGNAL_T logpipe (int sig GCC_UNUSED)
{
	register TScreen *screen = &term->screen;

#ifdef SYSV
	(void) signal(SIGPIPE, SIG_IGN);
#endif	/* SYSV */
	if(screen->logging)
		CloseLog(screen);
}
#endif /* ALLOWLOGFILEEXEC */

void
StartLog(register TScreen *screen)
{
	static char *log_default;
#ifdef ALLOWLOGFILEEXEC
	register char *cp;
	register int i = 0;
#endif /* ALLOWLOGFILEEXEC */

	if(screen->logging || (screen->inhibit & I_LOG))
		return;
#ifdef VMS  /* file name is fixed in VMS variant */
	screen->logfd = open(XTERM_VMS_LOGFILE, O_CREAT|O_TRUNC|O_APPEND|O_RDWR, 0640);
	if(screen->logfd < 0)return; /* open failed */
#else /*VMS*/
	if(screen->logfile == NULL || *screen->logfile == 0) {
		if(screen->logfile)
			free(screen->logfile);
		if(log_default == NULL) {
			if ((log_default = x_strdup(log_def_name)) == NULL)
				return;
			mktemp(log_default);
		}
		if((screen->logfile = x_strdup(log_default)) == 0)
			return;
	}
	if(*screen->logfile == '|') {	/* exec command */
#ifdef ALLOWLOGFILEEXEC
		/*
		 * Warning, enabling this "feature" allows arbitrary programs
		 * to be run.  If ALLOWLOGFILECHANGES is enabled, this can be
		 * done through escape sequences....  You have been warned.
		 */
		int p[2];
		static char *shell;
		register struct passwd *pw;

		if(pipe(p) < 0 || (i = fork()) < 0)
			return;
		if(i == 0) {	/* child */
			/*
			 * Close our output (we won't be talking back to the
			 * parent), and redirect our child's output to the
			 * original stderr.
			 */
			close(p[1]);
			dup2(p[0], 0);
			close(p[0]);
			dup2(fileno(stderr), 1);
			dup2(fileno(stderr), 2);

			close(fileno(stderr));
			close(ConnectionNumber(screen->display));
			close(screen->respond);

			if ((((cp = getenv("SHELL")) == NULL || *cp == 0)
			  && ((pw = getpwuid(screen->uid)) == NULL
			   || *(cp = pw->pw_shell) == 0))
			 || (shell = (char *)malloc(strlen(cp) + 1)) == 0)
				shell = "/bin/sh";
			else
				strcpy(shell, cp);

			signal(SIGHUP, SIG_DFL);
			signal(SIGCHLD, SIG_DFL);

			/* (this is redundant) */
			setgid(screen->gid);
			setuid(screen->uid);

			execl(shell, shell, "-c", &screen->logfile[1], 0);

			fprintf(stderr, "%s: Can't exec `%s'\n", xterm_name,
			 &screen->logfile[1]);
			exit(ERROR_LOGEXEC);
		}
		close(p[0]);
		screen->logfd = p[1];
		signal(SIGPIPE, logpipe);
#else
		Bell(XkbBI_Info,0);
		Bell(XkbBI_Info,0);
		return;
#endif
	} else {
	    if ((screen->logfd = open_userfile(screen->uid, screen->gid, screen->logfile, (log_default != 0))) < 0)
		    return;
	}
#endif /*VMS*/
	screen->logstart = CURRENT_EMU_VAL(screen, Tbuffer->ptr, VTbuffer.ptr);
	screen->logging = TRUE;
	update_logging();
}

void
CloseLog(register TScreen *screen)
{
	if(!screen->logging || (screen->inhibit & I_LOG))
		return;
	FlushLog(screen);
	close(screen->logfd);
	screen->logging = FALSE;
	update_logging();
}

void
FlushLog(register TScreen *screen)
{
	register IChar *cp;
	register int i;

#ifdef VMS /* avoid logging output loops which otherwise occur sometimes
	      when there is no output and cp/screen->logstart are 1 apart */
	if(!tt_new_output)return;
	tt_new_output = FALSE;
#endif /* VMS */
	cp = CURRENT_EMU_VAL(screen, Tbuffer->ptr, VTbuffer.ptr);
	if (screen->logstart != 0
	 && (i = cp - screen->logstart) > 0) {
#if OPT_WIDE_CHARS
		Char temp[80];
		IChar code;
		unsigned n;
		while (i-- > 0) {
			code = *(screen->logstart)++;
			if (screen->utf8_mode) {
				n = convertFromUTF8(code & 0xffff, temp);
			} else {
				temp[0] = code;
				n = 1;
				while (i > 0 && n < sizeof(temp)) {
					i--;
					temp[n++] = *(screen->logstart)++;
				}
			}
			write(screen->logfd, temp, n);
		}
#else
		write(screen->logfd, (char *)screen->logstart, i);
#endif
	}
	screen->logstart = DecodedData(CURRENT_EMU_VAL(screen, Tbuffer, &VTbuffer));
}

#endif /* ALLOWLOGGING */

/***====================================================================***/

#if OPT_ISO_COLORS
static void ReportAnsiColorRequest(XtermWidget pTerm, int colornum, int final)
{
	XColor color;
	Colormap cmap =	pTerm->core.colormap;
	char buffer[80];

	TRACE(("ReportAnsiColorRequest %d\n", colornum));
	color.pixel = GET_COLOR_RES(pTerm->screen.Acolors[colornum]);
	XQueryColor(term->screen.display, cmap, &color);
	sprintf(buffer, "4;%d;rgb:%04x/%04x/%04x",
		colornum,
		color.red,
		color.green,
		color.blue);
	unparseputc1(OSC,   pTerm->screen.respond);
	unparseputs(buffer, pTerm->screen.respond);
	unparseputc1(final, pTerm->screen.respond);
}

/*
* Find closest color for "def" in "cmap".
* Set "def" to the resulting color.
* Based on Monish Shah's "find_closest_color()" for Vim 6.0,
* modified with ideas from David Tong's "noflash" library.
* Return FALSE if not able to find or allocate a color.
*/
static int
find_closest_color(Display *display, Colormap cmap, XColor *def)
{
    double	tmp, distance, closestDistance;
    int		i, closest, numFound, cmap_size;
    XColor	*colortable;
    XVisualInfo	template, *visInfoPtr;
    char	*found;
    int		attempts;

    template.visualid = XVisualIDFromVisual(DefaultVisual(display,
					    XDefaultScreen(display)));
    visInfoPtr = XGetVisualInfo(display, (long)VisualIDMask,
				&template, &numFound);
    if (numFound < 1) {
	/* FindClosestColor couldn't lookup visual */
	return FALSE;
    }

    cmap_size = visInfoPtr->colormap_size;
    XFree((char *)visInfoPtr);
    colortable = (XColor *)malloc(cmap_size * sizeof(XColor));
    if (!colortable) {
	return FALSE;  /* out of memory */
    }
    found = (char *)calloc(cmap_size, sizeof(char));
    if (!found) {
	free(colortable);
	return FALSE;  /* out of memory */
    }

    for (i = 0; i  < cmap_size; i++) {
	colortable[i].pixel = (unsigned long)i;
    }
    XQueryColors (display, cmap, colortable, cmap_size);

    /*
     * Find the color that best approximates the desired one, then
     * try to allocate that color.  If that fails, it must mean that
     * the color was read-write (so we can't use it, since its owner
     * might change it) or else it was already freed.  Try again,
     * over and over again, until something succeeds.
     */
    for(attempts = 0; attempts < cmap_size; attempts++) {
	closestDistance = 1e30;
	closest = 0;
	for (i = 0; i < cmap_size; i++) {
	    if (!found[closest]) {
		/*
		 * Use Euclidean distance in RGB space, weighted by Y (of YIQ)
		 * as the objective function;  this accounts for differences
		 * in the color sensitivity of the eye.
		 */
		tmp = .30 * (((int)def->red) - (int)colortable[i].red);
		distance = tmp * tmp;
		tmp = .61 * (((int)def->green) - (int)colortable[i].green);
		distance += tmp * tmp;
		tmp = .11 * (((int)def->blue) - (int)colortable[i].blue);
		distance += tmp * tmp;
		if (distance < closestDistance)
		{
		    closest = i;
		    closestDistance = distance;
		}
	    }
	}
	if (XAllocColor(display, cmap, &colortable[closest]) != 0) {
	    *def = colortable[closest];
	    break;
	}
	found[closest] = TRUE;	/* Don't look at this entry again */
    }

    free(colortable);
    free(found);
    if (attempts < cmap_size) {
	return TRUE;		/* Got a closest matching color */
    } else {
	return FALSE;		/* Couldn't allocate a near match */
    }
}

static Boolean
AllocateAnsiColor(
	XtermWidget	 pTerm,
	ColorRes	*res,
	char		*spec)
{
XColor			 def;
register TScreen	*screen =	&pTerm->screen;
Colormap		 cmap =		pTerm->core.colormap;

    if (XParseColor(screen->display, cmap, spec, &def)
     && (XAllocColor(screen->display, cmap, &def)
      || find_closest_color(screen->display, cmap, &def))) {
	SET_COLOR_RES(res, def.pixel);
	TRACE(("AllocateAnsiColor %s (pixel %#lx)\n", spec, def.pixel));
	return(TRUE);
    }
    TRACE(("AllocateAnsiColor %s (failed)\n", spec));
    return(FALSE);
}

#if OPT_COLOR_RES
Pixel
xtermGetColorRes(ColorRes *res)
{
	if (!res->mode) {
		if (AllocateAnsiColor(term, res, res->resource)) {
			res->mode = True;
		} else {
			res->value = term->screen.foreground;
			res->mode = -True;
			fprintf(stderr,
				"%s: Cannot allocate color %s\n",
				xterm_name,
				res->resource);
		}
	}
	return res->value;
}
#endif

static Boolean
ChangeAnsiColorRequest(
	XtermWidget	pTerm,
	register char	*buf,
	int		final)
{
    char *name;
    int color;
    int r = False;

    TRACE(("ChangeAnsiColorRequest string='%s'\n", buf));

    while (buf && *buf) {
	name = strchr(buf, ';');
	if (name == NULL)
	    break;
	*name = '\0';
	name++;
	color = atoi(buf);
	if (color < 0 || color >= NUM_ANSI_COLORS)
	    break;
	buf = strchr(name, ';');
	if (buf) {
	    *buf = '\0';
	    buf++;
	}
	if (!strcmp(name, "?"))
	    ReportAnsiColorRequest(pTerm, color, final);
	else if (!AllocateAnsiColor(pTerm, &(pTerm->screen.Acolors[color]), name))
	    break;
	/* FIXME:  free old color somehow?  We aren't for the other color
	 * change style (dynamic colors).
	 */
	r = True;
    }
    if (r)
	ChangeAnsiColors(pTerm);
    return(r);
}
#else
#define find_closest_color(display, cmap, def) 0
#endif /* OPT_ISO_COLORS */

/***====================================================================***/

void
do_osc(Char *oscbuf, int len GCC_UNUSED, int final)
{
	register TScreen *screen = &(term->screen);
	register int mode;
	register Char *cp;
	int state = 0;
	char *buf = 0;

	/*
	 * Lines should be of the form <OSC> number ; string <ST>, however
	 * older xterms can accept <BEL> as a final character.  We will respond
	 * with the same final character as the application sends to make this
	 * work better with shell scripts, which may have trouble reading an
	 * <ESC><backslash>, which is the 7-bit equivalent to <ST>.
	 */
	mode = 0;
	for (cp = oscbuf; *cp != '\0'; cp++) {
		switch (state) {
		case 0:
			if (isdigit(*cp)) {
				mode = 10 * mode + (*cp - '0');
				if (mode > 65535)
					return;
				break;
			}
			/* FALLTHRU */
		case 1:
			if (*cp != ';')
				return;
			state = 2;
			break;
		case 2:
			buf = (char *)cp;
			state = 3;
			/* FALLTHRU */
		default:
			if (ansi_table[CharOf(*cp)] != CASE_PRINT)
				return;
		}
	}
	if (buf == 0) return;

	switch(mode) {
	case 0:	/* new icon name and title*/
		Changename(buf);
		Changetitle(buf);
		break;

	case 1:	/* new icon name only */
		Changename(buf);
		break;

	case 2:	/* new title only */
		Changetitle(buf);
		break;

	case 3: /* change X property */
		ChangeXprop(buf);
		break;
#if OPT_ISO_COLORS
	case 4:
		ChangeAnsiColorRequest(term, buf, final);
		break;
#endif
	case 10:	case 11:	case 12:
	case 13:	case 14:	case 15:
	case 16:	case 17:
		if (term->misc.dynamicColors)
		       ChangeColorsRequest(term, mode-10, buf, final);
		break;

#ifdef ALLOWLOGGING
	 case 46:	/* new log file */
#ifdef ALLOWLOGFILECHANGES
		/*
		 * Warning, enabling this feature allows people to overwrite
		 * arbitrary files accessible to the person running xterm.
		 */
		if (buf != 0
		 && strcmp(buf, "?")
		 && ((cp = malloc((unsigned)strlen(buf) + 1)) != NULL)) {
			strcpy(cp, buf);
			if(screen->logfile)
				free(screen->logfile);
			screen->logfile = cp;
			break;
		}
#endif
		Bell(XkbBI_Info,0);
		Bell(XkbBI_Info,0);
		break;
#endif /* ALLOWLOGGING */

	case 50:
		if (buf != 0 && !strcmp(buf, "?")) {
		    int num = screen->menu_font_number;

		    unparseputc1(OSC,   screen->respond);
		    unparseputs("50",   screen->respond);

		    if ((buf = screen->menu_font_names[num]) != 0) {
			unparseputc(';', screen->respond);
			unparseputs(buf, screen->respond);
		    }
		    unparseputc1(final,    screen->respond);
		} else {
		    /*
		     * If the font specification is a "#", followed by an
		     * optional sign and optional number, lookup the
		     * corresponding menu font entry.
		     */
		    if (buf != 0 && *buf == '#') {
			int num = screen->menu_font_number;
			int rel = 0;

			if (*++buf == '+') {
			    rel = 1;
			    buf++;
			} else if (*buf == '-') {
			    rel = -1;
			    buf++;
			}

			if (isdigit(CharOf(*buf))) {
			    int val = atoi(buf);
			    if (rel > 0)
				num += val;
			    else if (rel < 0)
				num -= val;
			    else
				num = val;
			} else if (rel) {
			    num += rel;
			} else {
			    num = 0;
			}

			if (num < 0
			 || num > fontMenu_lastBuiltin
			 || (buf = screen->menu_font_names[num]) == 0) {
			    Bell(XkbBI_MinorError,0);
			    break;
			}
		    }
		    SetVTFont (fontMenu_fontescape, True, VT_FONTSET(buf, NULL, NULL, NULL));
		}
		break;
	case 51:
		/* reserved for Emacs shell (Rob Myoff <mayoff@dqd.com>) */
		break;

	/*
	 * One could write code to send back the display and host names,
	 * but that could potentially open a fairly nasty security hole.
	 */
	}
}

#ifdef SunXK_F36
#define MAX_UDK 37
#else
#define MAX_UDK 35
#endif
static struct {
	char *str;
	int   len;
	} user_keys[MAX_UDK];

static int
hexvalue(int c)
{
	if (c >= '0' && c <= '9') return c - '0';
	if (c >= 'A' && c <= 'F') return c - 'A' + 10;
	if (c >= 'a' && c <= 'f') return c - 'a' + 10;
	return -1;
}

void
reset_decudk(void)
{
	int n;
	for (n = 0; n < MAX_UDK; n++) {
		if (user_keys[n].str != 0) {
			free(user_keys[n].str);
			user_keys[n].str = 0;
			user_keys[n].len = 0;
		}
	}
}

void
do_dcs(Char *dcsbuf, size_t dcslen)
{
	TScreen *screen = &term->screen;
	char reply[BUFSIZ];
	char *cp = (char *)dcsbuf;
	Bool okay;
	Bool clear_all;
	Bool lock_keys;

	TRACE(("do_dcs(%s:%d)\n", (char *)dcsbuf, dcslen));

	if (dcslen != strlen(cp))
		/* shouldn't have nulls in the string */
		return;

	switch (*cp) {		/* intermediate character, or parameter */
	case '$':		/* DECRQSS */
		okay = True;

		cp++;
		if (*cp++ == 'q') {
			if (!strcmp(cp, "\"q")) {		/* DECSCA */
				sprintf(reply, "%d%s",
					(screen->protected_mode == DEC_PROTECT)
					 && (term->flags & PROTECTED) ? 1 : 0,
					cp);
			} else if (!strcmp(cp, "\"p")) {	/* DECSCL */
				sprintf(reply, "%d%s%s",
					(screen->ansi_level ?
					 screen->ansi_level : 1) + 60,
					(screen->ansi_level >= 2)
					 ? (screen->control_eight_bits
						? ";0" : ";1")
					 : "",
					cp);
			} else if (!strcmp(cp, "r")) {		/* DECSTBM */
				sprintf(reply, "%d;%dr",
					screen->top_marg + 1,
					screen->bot_marg + 1);
			} else if (!strcmp(cp, "m")) {		/* SGR */
				strcpy(reply, "0");
				if (term->flags & BOLD)
					strcat(reply, ";1");
				if (term->flags & UNDERLINE)
					strcat(reply, ";4");
				if (term->flags & BLINK)
					strcat(reply, ";5");
				if (term->flags & INVERSE)
					strcat(reply, ";7");
				if (term->flags & INVISIBLE)
					strcat(reply, ";8");
				if_OPT_EXT_COLORS(screen,{
				if (term->flags & FG_COLOR) {
					if (term->cur_foreground >= 16)
						sprintf(reply+strlen(reply),
							";38;5;%d", term->cur_foreground);
					else
						sprintf(reply+strlen(reply),
							";%d%d",
							term->cur_foreground >= 8 ? 9 : 3,
							term->cur_foreground >= 8 ?
							term->cur_foreground - 8 :
							term->cur_foreground);
				}
				if (term->flags & BG_COLOR) {
					if (term->cur_background >= 16)
						sprintf(reply+strlen(reply),
							";48;5;%d", term->cur_foreground);
					else
						sprintf(reply+strlen(reply),
							";%d%d",
							term->cur_background >= 8 ? 10 : 4,
							term->cur_background >= 8 ?
							term->cur_background - 8 :
							term->cur_background);
				}
				})
				if_OPT_ISO_TRADITIONAL_COLORS(screen,{
				if (term->flags & FG_COLOR)
					sprintf(reply+strlen(reply),
						";%d%d",
						term->cur_foreground >= 8 ? 9 : 3,
						term->cur_foreground >= 8 ?
						term->cur_foreground - 8 :
						term->cur_foreground);
				if (term->flags & BG_COLOR)
					sprintf(reply+strlen(reply),
						";%d%d",
						term->cur_background >= 8 ? 10 : 4,
						term->cur_background >= 8 ?
						term->cur_background - 8 :
						term->cur_background);
				})
				strcat(reply, "m");
			} else
				okay = False;

			unparseputc1(DCS, screen->respond);
			unparseputc(okay ? '1' : '0', screen->respond);
			unparseputc('$', screen->respond);
			unparseputc('r', screen->respond);
			if (okay)
				cp = reply;
			unparseputs(cp, screen->respond);
			unparseputc1(ST, screen->respond);
		} else {
			unparseputc(CAN, screen->respond);
		}
		break;
#if OPT_TCAP_QUERY
	case '+':
		cp++;
		if (*cp == 'q') {
			unsigned state;
			int code;
			char *tmp;

			++cp;
			code = xtermcapKeycode(cp, &state);
			unparseputc1(DCS, screen->respond);
			unparseputc(code >= 0 ? '1' : '0', screen->respond);
			unparseputc('+', screen->respond);
			unparseputc('r', screen->respond);
			for (tmp = cp; *tmp; ++tmp)
				unparseputc(*tmp, screen->respond);
			if (code >= 0) {
				unparseputc('=', screen->respond);
				screen->tc_query = code;
				/* XK_COLORS is a fake code for the "Co" entry (maximum
				 * number of colors) */
				if (code == XK_COLORS) {
# if OPT_256_COLORS
					unparseputc('2', screen->respond);
					unparseputc('5', screen->respond);
					unparseputc('6', screen->respond);
# elif OPT_88_COLORS
					unparseputc('8', screen->respond);
					unparseputc('8', screen->respond);
# else
					unparseputc('1', screen->respond);
					unparseputc('6', screen->respond);
# endif
				}
				else {
					XKeyEvent event;
					event.state = state;
					Input(&(term->keyboard), screen, &event, False);
				}
				screen->tc_query = -1;
			}
			unparseputc1(ST, screen->respond);
		}
		break;
#endif
	default:
		if (isdigit(CharOf(*cp))) { /* digits are DECUDK, otherwise ignore */
			clear_all = True;
			lock_keys = True;

			if (*cp == '0') {
				cp++;
			} else if (*cp == '1') {
				cp++;
				clear_all = False;
			}

			if (*cp == ';')
				cp++;
			else if (*cp != '|')
				return;

			if (*cp == '0') {
				cp++;
			} else if (*cp == '1') {
				cp++;
				lock_keys = False;
			}

			if (*cp++ != '|')
				return;

			if (clear_all)
				reset_decudk();

			while (*cp) {
				char *str = (char *)malloc(strlen(cp) + 2);
				unsigned key = 0;
				int len = 0;

				while (isdigit(CharOf(*cp)))
					key = (key * 10) + (*cp++ - '0');
				if (*cp == '/') {
					cp++;
					while (*cp != ';' && *cp != '\0') {
						int hi = hexvalue(*cp++);
						int lo = hexvalue(*cp++);
						if (hi < 0 || lo < 0)
							return;
						str[len++] = (hi << 4) | lo;
					}
				}
				if (len > 0 && key < MAX_UDK) {
					if (user_keys[key].str != 0)
						free(user_keys[key].str);
					user_keys[key].str = str;
					user_keys[key].len = len;
				} else {
					free(str);
				}
				if (*cp == ';')
					cp++;
			}
		}
		break;
	}
}

char *
udk_lookup(int keycode, int *len)
{
	if (keycode >= 0 && keycode < MAX_UDK) {
		*len = user_keys[keycode].len;
		return user_keys[keycode].str;
	}
	return 0;
}

static void
ChangeGroup(String attribute, char * value)
{
	Arg args[1];
	char *name = (value != 0) ? (char *)value : "";

	TRACE(("ChangeGroup(attribute=%s, value=%s)\n", attribute, name));
#if OPT_SAME_NAME
	/* If the attribute isn't going to change, then don't bother... */

	if( sameName ) {
	    char *buf;
	    XtSetArg( args[0], attribute, &buf );
	    XtGetValues( toplevel, args, 1 );
	    if (strcmp(name, buf) == 0)
		return;
	}
#endif /* OPT_SAME_NAME */

	XtSetArg( args[0], attribute, name );
	XtSetValues( toplevel, args, 1 );
}

void
Changename(register char *name)
{
    if (name == 0)
	name = "";
#if OPT_ZICONBEEP	/* If warning should be given then give it */
    if ( zIconBeep && zIconBeep_flagged ) {
	char *newname = (char *)malloc(strlen(name)+ 4 + 1);
	if (!newname) {
	    fprintf(stderr, "malloc failed in Changename\n");
	    return;
	}
	strcpy(newname, "*** ");
	strcat(newname, name);
	ChangeGroup( XtNiconName, newname );
	free(newname);
    } else
#endif /* OPT_ZICONBEEP */
	ChangeGroup( XtNiconName, name );
}

void
Changetitle(register char *name)
{
    ChangeGroup( XtNtitle, name );
}

#define Strlen(s) strlen((char *)(s))

void
ChangeXprop(register char *buf)
{
    Display *dpy = XtDisplay(toplevel);
    Window w = XtWindow(toplevel);
    XTextProperty text_prop;
    Atom aprop;
    Char *pchEndPropName = (Char *)strchr(buf,'=');

    if (pchEndPropName)
	*pchEndPropName = '\0';
    aprop = XInternAtom(dpy, buf, False);
    if (pchEndPropName == NULL) {
    /* no "=value" given, so delete the property */
	XDeleteProperty(dpy, w, aprop);
    } else {
	text_prop.value = pchEndPropName+1;
	text_prop.encoding = XA_STRING;
	text_prop.format = 8;
	text_prop.nitems = Strlen(text_prop.value);
	XSetTextProperty(dpy,w,&text_prop,aprop);
    }
}

/***====================================================================***/

ScrnColors	*pOldColors= NULL;

static Boolean
GetOldColors(XtermWidget pTerm)
{
int	i;
    if (pOldColors == NULL) {
	pOldColors = (ScrnColors *)XtMalloc(sizeof(ScrnColors));
	if (pOldColors == NULL) {
	    fprintf(stderr,"allocation failure in GetOldColors\n");
	    return(FALSE);
	}
	pOldColors->which = 0;
	for (i = 0; i < NCOLORS; i++) {
	    pOldColors->colors[i] = 0;
	    pOldColors->names[i] = NULL;
	}
	GetColors(pTerm,pOldColors);
    }
    return(TRUE);
}

static void ReportColorRequest(XtermWidget pTerm, int ndx, int final)
{
	XColor color;
	Colormap cmap =	pTerm->core.colormap;
	char buffer[80];

	GetOldColors(pTerm);
	color.pixel = pOldColors->colors[ndx];
	TRACE(("ReportColors %d: %#lx\n", ndx, pOldColors->colors[ndx]));
	XQueryColor(term->screen.display, cmap, &color);
	sprintf(buffer, "%d;rgb:%04x/%04x/%04x", ndx + 10,
		color.red,
		color.green,
		color.blue);
	unparseputc1(OSC,   pTerm->screen.respond);
	unparseputs(buffer, pTerm->screen.respond);
	unparseputc1(final, pTerm->screen.respond);
}

static Boolean
UpdateOldColors(
	XtermWidget	pTerm GCC_UNUSED,
	ScrnColors	*pNew)
{
int	i;

    /* if we were going to free old colors, this would be the place to
     * do it.   I've decided not to (for now), because it seems likely
     * that we'd have a small set of colors we use over and over, and that
     * we could save some overhead this way.   The only case in which this
     * (clearly) fails is if someone is trying a boatload of colors, in
     * which case they can restart xterm
     */
    for (i = 0; i < NCOLORS; i++) {
	if (COLOR_DEFINED(pNew, i)) {
	    if (pOldColors->names[i] != NULL) {
		XtFree(pOldColors->names[i]);
		pOldColors->names[i] = NULL;
	    }
	    if (pNew->names[i]) {
		pOldColors->names[i] = pNew->names[i];
	    }
	    pOldColors->colors[i] = pNew->colors[i];
	}
    }
    return(TRUE);
}

void
ReverseOldColors(void)
{
register ScrnColors	*pOld= pOldColors;
Pixel	 tmpPix;
char	*tmpName;

    if (pOld) {
	/* change text cursor, if necesary */
	if (pOld->colors[TEXT_CURSOR] == pOld->colors[TEXT_FG]) {
	    pOld->colors[TEXT_CURSOR] =	 pOld->colors[TEXT_BG];
	    if (pOld->names[TEXT_CURSOR]) {
		XtFree(pOldColors->names[TEXT_CURSOR]);
		pOld->names[TEXT_CURSOR] = NULL;
	    }
	    if (pOld->names[TEXT_BG]) {
		tmpName = XtMalloc(strlen(pOld->names[TEXT_BG])+1);
		if (tmpName) {
		    strcpy(tmpName,pOld->names[TEXT_BG]);
		    pOld->names[TEXT_CURSOR]= tmpName;
		}
	    }
	}

	EXCHANGE(pOld->colors[TEXT_FG],	pOld->colors[TEXT_BG], tmpPix);
	EXCHANGE(pOld->names[TEXT_FG],	pOld->names[TEXT_BG], tmpName);

	EXCHANGE(pOld->colors[MOUSE_FG],pOld->colors[MOUSE_BG], tmpPix);
	EXCHANGE(pOld->names[MOUSE_FG],	pOld->names[MOUSE_BG], tmpName);

	EXCHANGE(pOld->colors[TEK_FG],	pOld->colors[TEK_BG], tmpPix);
	EXCHANGE(pOld->names[TEK_FG],	pOld->names[TEK_BG], tmpName);
    }
    return;
}

static Boolean
AllocateColor(
	XtermWidget	 pTerm,
	ScrnColors	*pNew,
	int		 ndx,
	char		*name)
{
XColor			 def;
register TScreen	*screen =	&pTerm->screen;
Colormap		 cmap =		pTerm->core.colormap;
char			*newName;

    if (XParseColor(screen->display, cmap, name, &def)
     && (XAllocColor(screen->display, cmap, &def)
      || find_closest_color(screen->display, cmap, &def))
     && (newName = XtMalloc(strlen(name)+1)) != 0) {
	SET_COLOR_VALUE(pNew, ndx, def.pixel);
	strcpy(newName, name);
	SET_COLOR_NAME(pNew, ndx, newName);
	TRACE(("AllocateColor #%d: %s (pixel %#lx)\n", ndx, newName, def.pixel));
	return(TRUE);
    }
    TRACE(("AllocateColor #%d: %s (failed)\n", ndx, name));
    return(FALSE);
}

static Boolean
ChangeColorsRequest(
	XtermWidget	pTerm,
	int		start,
	register char	*names,
	int		final)
{
char		*thisName;
ScrnColors	newColors;
int		i, ndx;

    TRACE(("ChangeColorsRequest start=%d, names='%s'\n", start, names));

    if ((pOldColors == NULL)
     && (!GetOldColors(pTerm))) {
	return(FALSE);
    }
    newColors.which = 0;
    for (i = 0; i < NCOLORS; i++) {
	newColors.names[i] = NULL;
    }
    for (i = start; i < NCOLORS; i++) {
	if (term->misc.re_verse)	ndx = OPPOSITE_COLOR(i);
	else				ndx = i;
	if ((names == NULL) || (names[0] == '\0')) {
	    newColors.names[ndx] = NULL;
	}
	else {
	    if (names[0] == ';')
		 thisName=	NULL;
	    else thisName=	names;
	    names = strchr(names, ';');
	    if (names != NULL) {
		*names=	'\0';
		names++;
	    }
	    if (thisName != 0 && !strcmp(thisName, "?"))
		ReportColorRequest(pTerm, ndx, final);
	    else if (!pOldColors->names[ndx]
	     || (thisName
	      && strcmp(thisName, pOldColors->names[ndx]))) {
		AllocateColor(pTerm, &newColors, ndx, thisName);
	    }
	}
    }

    if (newColors.which == 0)
	return(TRUE);

    ChangeColors(pTerm, &newColors);
    UpdateOldColors(pTerm, &newColors);
    return(TRUE);
}

/***====================================================================***/

#ifndef DEBUG
/* ARGSUSED */
#endif
void
Panic(char *s GCC_UNUSED, int a GCC_UNUSED)
{
#ifdef DEBUG
	if(debug) {
		fprintf(stderr, "%s: PANIC!\t", xterm_name);
		fprintf(stderr, s, a);
		fputs("\r\n", stderr);
		fflush(stderr);
	}
#endif	/* DEBUG */
}

char *SysErrorMsg (int n)
{
    register char *s = strerror(n);
    return s ? s : "unknown error";
}

void
SysError (int i)
{
	int oerrno;

	oerrno = errno;
	/* perror(3) write(2)s to file descriptor 2 */
	fprintf (stderr, "%s: Error %d, errno %d: ", xterm_name, i, oerrno);
	fprintf (stderr, "%s\n", SysErrorMsg (oerrno));
	Cleanup(i);
}

void
Error (int i)
{
	fprintf (stderr, "%s: Error %d\n", xterm_name, i);
	Cleanup(i);
}

static void
Sleep (int msec)
{
	static struct timeval select_timeout;

	select_timeout.tv_sec = 0;
	select_timeout.tv_usec = msec * 1000;
	select(0, 0, 0, 0, &select_timeout);
}

/*
 * cleanup by sending SIGHUP to client processes
 */
void
Cleanup (int code)
{
	static Boolean cleaning;
	register TScreen *screen;

	if (cleaning) {
		hold_screen = 0;
		return;
	}
	cleaning = TRUE;

	TRACE(("Cleanup %d\n", code));

	screen = &term->screen;

	if (hold_screen) {
		hold_screen = 2;
		while (hold_screen) {
			xevents();
			Sleep(10);
		}
	}

	if (screen->pid > 1) {
	    (void) kill_process_group (screen->pid, SIGHUP);
	}
#ifdef AMOEBA
	if (!NULLPORT(&screen->proccap.cap_port))
	    (void) pro_stun(&screen->proccap, -1L);
	cb_close(screen->tty_outq);
	cb_close(screen->tty_inq);
#endif
	Exit (code);
}

/*
 * sets the value of var to be arg in the Unix 4.2 BSD environment env.
 * Var should end with '=' (bindings are of the form "var=value").
 * This procedure assumes the memory for the first level of environ
 * was allocated using calloc, with enough extra room at the end so not
 * to have to do a realloc().
 */
void
xtermSetenv (register char *var, register char *value)
{
	register int envindex = 0;
	register size_t len = strlen(var);

	TRACE(("xtermSetenv(var=%s, value=%s)\n", var, value));

	while (environ [envindex] != NULL) {
	    if (strncmp (environ [envindex], var, len) == 0) {
		/* found it */
		environ[envindex] = (char *)malloc ((unsigned)len + strlen (value) + 1);
		strcpy (environ [envindex], var);
		strcat (environ [envindex], value);
		return;
	    }
	    envindex ++;
	}

	TRACE(("...expanding env to %d\n", envindex+1));

	environ [envindex] = (char *) malloc ((unsigned)len + strlen (value) + 1);
	(void) strcpy (environ [envindex], var);
	strcat (environ [envindex], value);
	environ [++envindex] = NULL;
}

/*ARGSUSED*/
int
xerror(Display *d, register XErrorEvent *ev)
{
    fprintf (stderr, "%s:  warning, error event received:\n", xterm_name);
    (void) XmuPrintDefaultErrorMessage (d, ev, stderr);
    Exit (ERROR_XERROR);
    return 0;	/* appease the compiler */
}

/*ARGSUSED*/
int
xioerror(Display *dpy)
{
    (void) fprintf (stderr,
		    "%s:  fatal IO error %d (%s) or KillClient on X server \"%s\"\r\n",
		    xterm_name, errno, SysErrorMsg (errno),
		    DisplayString (dpy));

    Exit(ERROR_XIOERROR);
    return 0;	/* appease the compiler */
}

extern char *ProgramName;

void xt_error(String message)
{
    (void) fprintf (stderr, "%s Xt error: %s\n", ProgramName, message);
    exit(1);
}

int
XStrCmp(char *s1, char *s2)
{
  if (s1 && s2) return(strcmp(s1, s2));
  if (s1 && *s1) return(1);
  if (s2 && *s2) return(-1);
  return(0);
}

#if OPT_TEK4014
static void withdraw_window (Display *dpy, Window w, int scr)
{
    TRACE(("withdraw_window %#lx\n", (long)w));
    (void) XmuUpdateMapHints (dpy, w, NULL);
    XWithdrawWindow (dpy, w, scr);
    return;
}
#endif


void set_vt_visibility (Boolean on)
{
    register TScreen *screen = &term->screen;

    TRACE(("set_vt_visibility(%d)\n", on));
    if (on) {
	if (!screen->Vshow && term) {
	    VTInit ();
	    XtMapWidget (XtParent(term));
#if OPT_TOOLBAR
	    /* we need both of these during initialization */
	    XtMapWidget (SHELL_OF(term));
#endif
	    screen->Vshow = TRUE;
	}
    }
#if OPT_TEK4014
    else {
	if (screen->Vshow && term) {
	    withdraw_window (XtDisplay (term),
			     XtWindow(SHELL_OF(term)),
			     XScreenNumberOfScreen(XtScreen(term)));
	    screen->Vshow = FALSE;
	}
    }
    set_vthide_sensitivity();
    set_tekhide_sensitivity();
    update_vttekmode();
    update_tekshow();
    update_vtshow();
#endif
    return;
}

#if OPT_TEK4014
extern Atom wm_delete_window;	/* for ICCCM delete window */

void set_tek_visibility (Boolean on)
{
    register TScreen *screen = &term->screen;

    TRACE(("set_tek_visibility(%d)\n", on));
    if (on) {
	if (!screen->Tshow && (tekWidget || TekInit())) {
	    Widget tekParent = SHELL_OF(tekWidget);
	    XtRealizeWidget (tekParent);
	    XtMapWidget (tekParent);
	    XtOverrideTranslations(tekParent,
				   XtParseTranslationTable
				   ("<Message>WM_PROTOCOLS: DeleteWindow()"));
	    (void) XSetWMProtocols (XtDisplay(tekParent),
				    XtWindow(tekParent),
				    &wm_delete_window, 1);
	    screen->Tshow = TRUE;
	}
    } else {
	if (screen->Tshow && tekWidget) {
	    withdraw_window (XtDisplay (tekWidget),
			     XtWindow(SHELL_OF(tekWidget)),
			     XScreenNumberOfScreen(XtScreen(tekWidget)));
	    screen->Tshow = FALSE;
	}
    }
    set_tekhide_sensitivity();
    set_vthide_sensitivity();
    update_vtshow();
    update_tekshow();
    update_vttekmode();
    return;
}

void end_tek_mode (void)
{
    register TScreen *screen = &term->screen;

    if (screen->TekEmu) {
#ifdef ALLOWLOGGING
	if (screen->logging) {
	    FlushLog (screen);
	    screen->logstart = DecodedData(&VTbuffer);
	}
#endif
	longjmp(Tekend, 1);
    }
    return;
}

void end_vt_mode (void)
{
    register TScreen *screen = &term->screen;

    if (!screen->TekEmu) {
#ifdef ALLOWLOGGING
	if(screen->logging && TekPtyData()) {
	    FlushLog(screen);
	    screen->logstart = DecodedData(Tbuffer);
	}
#endif
	screen->TekEmu = TRUE;
	longjmp(VTend, 1);
    }
    return;
}

void switch_modes (Bool tovt)		/* if true, then become vt mode */
{
    if (tovt) {
	if (TekRefresh) dorefresh();
	end_tek_mode ();		/* WARNING: this does a longjmp... */
    } else {
	end_vt_mode ();			/* WARNING: this does a longjmp... */
    }
}

void hide_vt_window (void)
{
    register TScreen *screen = &term->screen;

    set_vt_visibility (FALSE);
    if (!screen->TekEmu) switch_modes (False);	/* switch to tek mode */
}

void hide_tek_window (void)
{
    register TScreen *screen = &term->screen;

    set_tek_visibility (FALSE);
    TekRefresh = (TekLink *)0;
    if (screen->TekEmu) switch_modes (True);	/* does longjmp to vt mode */
}
#endif /* OPT_TEK4014 */
