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misc.c
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1992-05-26
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/*
* $XConsortium: misc.c,v 1.92 92/03/13 17:02:08 gildea Exp $
*/
/*
* 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 "ptyx.h" /* X headers included here. */
#include <X11/Xos.h>
#include <stdio.h>
#include <setjmp.h>
#include <signal.h>
#include <ctype.h>
#include <pwd.h>
#include <errno.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>
#include "data.h"
#include "error.h"
#include "menu.h"
extern jmp_buf Tekend;
extern jmp_buf VTend;
#ifndef X_NOT_STDC_ENV
#include <stdlib.h>
#else
extern char *malloc();
extern char *getenv();
#endif
#if defined(macII) && !defined(__STDC__) /* stdlib.h fails to define these */
char *malloc();
#endif /* macII */
static void DoSpecialEnterNotify();
static void DoSpecialLeaveNotify();
xevents()
{
XEvent event;
register TScreen *screen = &term->screen;
extern XtAppContext app_con;
if(screen->scroll_amt)
FlushScroll(screen);
if (!XPending (screen->display))
/* protect against events/errors being swallowed by us or Xlib */
return;
do {
if (waitingForTrackInfo)
return;
XNextEvent (screen->display, &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(event.type == EnterNotify &&
(event.xcrossing.window == XtWindow(XtParent(term)) ||
(tekWidget &&
event.xcrossing.window == XtWindow(XtParent(tekWidget)))))
DoSpecialEnterNotify (&event.xcrossing);
else
if(event.type == LeaveNotify &&
(event.xcrossing.window == XtWindow(XtParent(term)) ||
(tekWidget &&
event.xcrossing.window == XtWindow(XtParent(tekWidget)))))
DoSpecialLeaveNotify (&event.xcrossing);
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 (QLength(screen->display) > 0);
}
Cursor make_colored_cursor (cursorindex, fg, bg)
int cursorindex; /* index into font */
unsigned long fg, 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(w, event, params, nparams)
Widget w;
XEvent *event;
String *params;
Cardinal *nparams;
{
register TScreen *screen = &term->screen;
#ifdef ACTIVEWINDOWINPUTONLY
if (w == (screen->TekEmu ? (Widget)tekWidget : (Widget)term))
#endif
Input (&term->keyboard, screen, &event->xkey, False);
}
/* ARGSUSED */
void HandleEightBitKeyPressed(w, event, params, nparams)
Widget w;
XEvent *event;
String *params;
Cardinal *nparams;
{
register TScreen *screen = &term->screen;
#ifdef ACTIVEWINDOWINPUTONLY
if (w == (screen->TekEmu ? (Widget)tekWidget : (Widget)term))
#endif
Input (&term->keyboard, screen, &event->xkey, True);
}
/* ARGSUSED */
void HandleStringEvent(w, event, params, nparams)
Widget w;
XEvent *event;
String *params;
Cardinal *nparams;
{
register TScreen *screen = &term->screen;
#ifdef ACTIVEWINDOWINPUTONLY
if (w != (screen->TekEmu ? (Widget)tekWidget : (Widget)term)) return;
#endif
if (*nparams != 1) return;
if ((*params)[0] == '0' && (*params)[1] == 'x' && (*params)[2] != '\0') {
char c, *p, hexval[2];
hexval[0] = hexval[1] = 0;
for (p = *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, *params, strlen(*params));
}
}
static void DoSpecialEnterNotify (ev)
register XEnterWindowEvent *ev;
{
register TScreen *screen = &term->screen;
#ifdef ACTIVEWINDOWINPUTONLY
if (ev->window == XtWindow(XtParent(screen->TekEmu ?
(Widget)tekWidget : (Widget)term)))
#endif
if (((ev->detail) != NotifyInferior) &&
ev->focus &&
!(screen->select & FOCUS))
selectwindow(screen, INWINDOW);
}
/*ARGSUSED*/
void HandleEnterWindow(w, eventdata, event)
Widget w;
register XEnterWindowEvent *event;
caddr_t eventdata;
{
/* NOP since we handled it above */
}
static void DoSpecialLeaveNotify (ev)
register XEnterWindowEvent *ev;
{
register TScreen *screen = &term->screen;
#ifdef ACTIVEWINDOWINPUTONLY
if (ev->window == XtWindow(XtParent(screen->TekEmu ?
(Widget)tekWidget : (Widget)term)))
#endif
if (((ev->detail) != NotifyInferior) &&
ev->focus &&
!(screen->select & FOCUS))
unselectwindow(screen, INWINDOW);
}
/*ARGSUSED*/
void HandleLeaveWindow(w, eventdata, event)
Widget w;
register XEnterWindowEvent *event;
caddr_t eventdata;
{
/* NOP since we handled it above */
}
/*ARGSUSED*/
void HandleFocusChange(w, eventdata, event)
Widget w;
register XFocusChangeEvent *event;
caddr_t eventdata;
{
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)) {
XBell(screen->display, 100);
ReverseVideo(term);
screen->grabbedKbd = FALSE;
update_securekbd();
}
}
}
selectwindow(screen, flag)
register TScreen *screen;
register int flag;
{
if(screen->TekEmu) {
if(!Ttoggled)
TCursorToggle(TOGGLE);
screen->select |= flag;
if(!Ttoggled)
TCursorToggle(TOGGLE);
return;
} else {
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;
}
}
unselectwindow(screen, flag)
register TScreen *screen;
register int flag;
{
if (screen->always_highlight) return;
if(screen->TekEmu) {
if(!Ttoggled) TCursorToggle(TOGGLE);
screen->select &= ~flag;
if(!Ttoggled) TCursorToggle(TOGGLE);
} else {
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 */
Bell()
{
extern XtermWidget term;
register TScreen *screen = &term->screen;
struct timeval curtime;
long now_msecs;
/* has enough time gone by that we are allowed to ring
the bell again? */
if(screen->bellSuppressTime) {
if(screen->bellInProgress) {
if (QLength(screen->display) > 0 ||
GetBytesAvailable (ConnectionNumber(screen->display)) > 0)
xevents();
if(screen->bellInProgress) { /* even after new events? */
return;
}
}
gettimeofday(&curtime, NULL);
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
XBell(screen->display, 0);
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 = screen->TekEmu ? (Widget) tekWidget : (Widget) term;
XChangeProperty(XtDisplay(w), XtWindow(w),
XA_NOTICE, XA_NOTICE, 8, PropModeAppend, NULL, 0);
screen->bellInProgress = TRUE;
}
}
VisualBell()
{
extern XtermWidget term;
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(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 {
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(w, data, ev, more)
Widget w;
XtPointer data;
XEvent *ev;
Boolean *more;
{
register TScreen *screen = &term->screen;
if (ev->xproperty.atom == XA_NOTICE) {
screen->bellInProgress = FALSE;
}
}
Redraw()
{
extern XtermWidget term;
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(screen->scrollbar)
(*screen->scrollWidget->core.widget_class->core_class.expose)(screen->scrollWidget, (XEvent *)&event, NULL);
}
if(TWindow(screen) && screen->Tshow) {
event.window = TWindow(screen);
event.width = tekWidget->core.width;
event.height = tekWidget->core.height;
TekExpose (tekWidget, &event, NULL);
}
}
StartLog(screen)
register TScreen *screen;
{
register char *cp;
register int i;
static char *log_default;
#ifdef ALLOWLOGFILEEXEC
void logpipe();
#ifdef SYSV
/* SYSV has another pointer which should be part of the
** FILE structure but is actually a separate array.
*/
unsigned char *old_bufend;
#endif /* SYSV */
#endif /* ALLOWLOGFILEEXEC */
if(screen->logging || (screen->inhibit & I_LOG))
return;
if(screen->logfile == NULL || *screen->logfile == 0) {
if(screen->logfile)
free(screen->logfile);
if(log_default == NULL)
log_default = log_def_name;
mktemp(log_default);
if((screen->logfile = malloc((unsigned)strlen(log_default) + 1)) == NULL)
return;
strcpy(screen->logfile, log_default);
}
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;
if(pipe(p) < 0 || (i = fork()) < 0)
return;
if(i == 0) { /* child */
close(p[1]);
dup2(p[0], 0);
close(p[0]);
dup2(fileno(stderr), 1);
dup2(fileno(stderr), 2);
#ifdef SYSV
old_bufend = _bufend(stderr);
#endif /* SYSV */
close(fileno(stderr));
stderr->_file = 2;
#ifdef SYSV
_bufend(stderr) = old_bufend;
#endif /* SYSV */
close(ConnectionNumber(screen->display));
close(screen->respond);
if(!shell) {
register struct passwd *pw;
struct passwd *getpwuid();
if(((cp = getenv("SHELL")) == NULL || *cp == 0)
&& ((pw = getpwuid(screen->uid)) == NULL ||
*(cp = pw->pw_shell) == 0) ||
(shell = malloc((unsigned) strlen(cp) + 1)) == NULL)
shell = "/bin/sh";
else
strcpy(shell, cp);
}
signal(SIGHUP, SIG_DFL);
signal(SIGCHLD, SIG_DFL);
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();
Bell();
return;
#endif
} else {
if(access(screen->logfile, F_OK) == 0) {
if(access(screen->logfile, W_OK) < 0)
return;
} else if(cp = rindex(screen->logfile, '/')) {
*cp = 0;
i = access(screen->logfile, W_OK);
*cp = '/';
if(i < 0)
return;
} else if(access(".", W_OK) < 0)
return;
if((screen->logfd = open(screen->logfile, O_WRONLY | O_APPEND |
O_CREAT, 0644)) < 0)
return;
chown(screen->logfile, screen->uid, screen->gid);
}
screen->logstart = screen->TekEmu ? Tbptr : bptr;
screen->logging = TRUE;
update_logging();
}
CloseLog(screen)
register TScreen *screen;
{
if(!screen->logging || (screen->inhibit & I_LOG))
return;
FlushLog(screen);
close(screen->logfd);
screen->logging = FALSE;
update_logging();
}
FlushLog(screen)
register TScreen *screen;
{
register Char *cp;
register int i;
cp = screen->TekEmu ? Tbptr : bptr;
if((i = cp - screen->logstart) > 0)
write(screen->logfd, (char *)screen->logstart, i);
screen->logstart = screen->TekEmu ? Tbuffer : buffer;
}
#ifdef ALLOWLOGFILEEXEC
void logpipe()
{
register TScreen *screen = &term->screen;
#ifdef SYSV
(void) signal(SIGPIPE, SIG_IGN);
#endif /* SYSV */
if(screen->logging)
CloseLog(screen);
}
#endif /* ALLOWLOGFILEEXEC */
do_osc(func)
int (*func)();
{
register int mode, c;
register char *cp;
char buf[512];
char *bufend = &buf[(sizeof buf) - 1]; /* leave room for null */
Bool okay = True;
/*
* lines should be of the form <ESC> ] number ; string <BEL>
*
* where number is one of 0, 1, 2, or 46
*/
mode = 0;
while(isdigit(c = (*func)()))
mode = 10 * mode + (c - '0');
if (c != ';') okay = False;
cp = buf;
while(isprint((c = (*func)()) & 0x7f) && cp < bufend)
*cp++ = c;
if (c != 7) okay = False;
*cp = 0;
if (okay) 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 46: /* new log file */
#ifdef ALLOWLOGFILECHANGES
/*
* Warning, enabling this feature allows people to overwrite
* arbitrary files accessible to the person running xterm.
*/
if((cp = malloc((unsigned)strlen(buf) + 1)) == NULL)
break;
strcpy(cp, buf);
if(term->screen.logfile)
free(term->screen.logfile);
term->screen.logfile = cp;
#else
Bell();
Bell();
#endif
break;
case 50:
SetVTFont (fontMenu_fontescape, True, buf, NULL);
break;
/*
* One could write code to send back the display and host names,
* but that could potentially open a fairly nasty security hole.
*/
}
}
static ChangeGroup(attribute, value)
String attribute;
XtArgVal value;
{
extern Widget toplevel;
Arg args[1];
XtSetArg( args[0], attribute, value );
XtSetValues( toplevel, args, 1 );
}
Changename(name)
register char *name;
{
ChangeGroup( XtNiconName, (XtArgVal)name );
}
Changetitle(name)
register char *name;
{
ChangeGroup( XtNtitle, (XtArgVal)name );
}
#ifndef DEBUG
/* ARGSUSED */
#endif
Panic(s, a)
char *s;
int a;
{
#ifdef DEBUG
if(debug) {
fprintf(stderr, "%s: PANIC! ", xterm_name);
fprintf(stderr, s, a);
fputs("\r\n", stderr);
fflush(stderr);
}
#endif /* DEBUG */
}
char *SysErrorMsg (n)
int n;
{
extern char *sys_errlist[];
extern int sys_nerr;
return ((n >= 0 && n < sys_nerr) ? sys_errlist[n] : "unknown error");
}
SysError (i)
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);
}
Error (i)
int i;
{
fprintf (stderr, "%s: Error %d\n", xterm_name, i);
Cleanup(i);
}
/*
* cleanup by sending SIGHUP to client processes
*/
Cleanup (code)
int code;
{
extern XtermWidget term;
register TScreen *screen;
screen = &term->screen;
if (screen->pid > 1) {
(void) kill_process_group (screen->pid, SIGHUP);
}
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().
*/
Setenv (var, value)
register char *var, *value;
{
extern char **environ;
register int envindex = 0;
register int len = strlen(var);
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 ++;
}
#ifdef DEBUG
if (debug) fputs ("expanding env\n", stderr);
#endif /* DEBUG */
environ [envindex] = (char *) malloc ((unsigned)len + strlen (value) + 1);
(void) strcpy (environ [envindex], var);
strcat (environ [envindex], value);
environ [++envindex] = NULL;
}
/*
* returns a pointer to the first occurrence of s2 in s1,
* or NULL if there are none.
*/
char *strindex (s1, s2)
register char *s1, *s2;
{
register char *s3;
int s2len = strlen (s2);
while ((s3=index(s1, *s2)) != NULL) {
if (strncmp(s3, s2, s2len) == 0)
return (s3);
s1 = ++s3;
}
return (NULL);
}
/*ARGSUSED*/
xerror(d, ev)
Display *d;
register XErrorEvent *ev;
{
fprintf (stderr, "%s: warning, error event receieved:\n", xterm_name);
(void) XmuPrintDefaultErrorMessage (d, ev, stderr);
Exit (ERROR_XERROR);
}
/*ARGSUSED*/
xioerror(dpy)
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);
}
XStrCmp(s1, s2)
char *s1, *s2;
{
if (s1 && s2) return(strcmp(s1, s2));
if (s1 && *s1) return(1);
if (s2 && *s2) return(-1);
return(0);
}
static void withdraw_window (dpy, w, scr)
Display *dpy;
Window w;
int scr;
{
(void) XmuUpdateMapHints (dpy, w, NULL);
XWithdrawWindow (dpy, w, scr);
return;
}
void set_vt_visibility (on)
Boolean on;
{
register TScreen *screen = &term->screen;
if (on) {
if (!screen->Vshow && term) {
VTInit ();
XtMapWidget (term->core.parent);
screen->Vshow = TRUE;
}
} else {
if (screen->Vshow && term) {
withdraw_window (XtDisplay (term),
XtWindow(XtParent(term)),
XScreenNumberOfScreen(XtScreen(term)));
screen->Vshow = FALSE;
}
}
set_vthide_sensitivity();
set_tekhide_sensitivity();
update_vttekmode();
update_tekshow();
update_vtshow();
return;
}
extern Atom wm_delete_window; /* for ICCCM delete window */
void set_tek_visibility (on)
Boolean on;
{
register TScreen *screen = &term->screen;
if (on) {
if (!screen->Tshow && (tekWidget || TekInit())) {
Widget tekParent = tekWidget->core.parent;
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(XtParent(tekWidget)),
XScreenNumberOfScreen(XtScreen(tekWidget)));
screen->Tshow = FALSE;
}
}
set_tekhide_sensitivity();
set_vthide_sensitivity();
update_vtshow();
update_tekshow();
update_vttekmode();
return;
}
void end_tek_mode ()
{
register TScreen *screen = &term->screen;
if (screen->TekEmu) {
if (screen->logging) {
FlushLog (screen);
screen->logstart = buffer;
}
longjmp(Tekend, 1);
}
return;
}
void end_vt_mode ()
{
register TScreen *screen = &term->screen;
if (!screen->TekEmu) {
if(screen->logging) {
FlushLog(screen);
screen->logstart = Tbuffer;
}
screen->TekEmu = TRUE;
longjmp(VTend, 1);
}
return;
}
void switch_modes (tovt)
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 ()
{
register TScreen *screen = &term->screen;
set_vt_visibility (FALSE);
if (!screen->TekEmu) switch_modes (False); /* switch to tek mode */
}
void hide_tek_window ()
{
register TScreen *screen = &term->screen;
set_tek_visibility (FALSE);
TekRefresh = (TekLink *)0;
if (screen->TekEmu) switch_modes (True); /* does longjmp to vt mode */
}