/* Updating of data structures for redisplay.
- Copyright (C) 1985, 1986, 1987, 1988, 1990, 1992 Free Software Foundation, Inc.
+ Copyright (C) 1985, 1986, 1987, 1988, 1993 Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 1, or (at your option)
+the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU Emacs is distributed in the hope that it will be useful,
#include <stdio.h>
#include <ctype.h>
+#include "lisp.h"
#include "termchar.h"
#include "termopts.h"
+#include "termhooks.h"
#include "cm.h"
-#include "lisp.h"
#include "dispextern.h"
#include "buffer.h"
#include "frame.h"
exist inside frame objects lives in the following structure instead.
NOTE: the_only_frame is not checked for garbage collection; don't
- store collectable objects in any of its fields!
+ store collectible objects in any of its fields!
You're not/The only frame in town/... */
return Qnil;
}
-DEFUN ("redraw-display", Fredraw_display, Sredraw_display, 0, 0, "",
- "Redraw all frames marked as having their images garbled.")
- ()
-{
- Lisp_Object frame, tail;
-
- for (tail = Vframe_list; CONSP (tail); tail = XCONS (tail)->cdr)
- {
- frame = XCONS (tail)->car;
- if (XFRAME (frame)->garbaged && XFRAME (frame)->visible)
- Fredraw_frame (frame);
- }
- return Qnil;
-}
-
redraw_frame (f)
FRAME_PTR f;
{
Fredraw_frame (frame);
}
-#else /* not MULTI_FRAME */
+#else
-DEFUN ("redraw-display", Fredraw_display, Sredraw_display, 0, 0, 0,
- "Clear screen and output again what is supposed to appear on it.")
- ()
+DEFUN ("redraw-frame", Fredraw_frame, Sredraw_frame, 1, 1, "",
+ "Clear frame FRAME and output again what is supposed to appear on it.")
+ (frame)
+ Lisp_Object frame;
{
update_begin (0);
set_terminal_modes ();
windows_or_buffers_changed++;
/* Mark all windows as INaccurate,
so that every window will have its redisplay done. */
- mark_window_display_accurate (FRAME_ROOT_WINDOW (0));
+ mark_window_display_accurate (FRAME_ROOT_WINDOW (0), 0);
return Qnil;
}
-#endif /* not MULTI_FRAME */
+#endif
+
+DEFUN ("redraw-display", Fredraw_display, Sredraw_display, 0, 0, "",
+ "Clear and redisplay all visible frames.")
+ ()
+{
+ Lisp_Object tail, frame;
+
+ FOR_EACH_FRAME (tail, frame)
+ if (FRAME_VISIBLE_P (XFRAME (frame)))
+ Fredraw_frame (frame);
+
+ return Qnil;
+}
+
+/* This is used when frame_garbaged is set.
+ Redraw the individual frames marked as garbaged. */
+
+void
+redraw_garbaged_frames ()
+{
+ Lisp_Object tail, frame;
+
+ FOR_EACH_FRAME (tail, frame)
+ if (FRAME_VISIBLE_P (XFRAME (frame))
+ && FRAME_GARBAGED_P (XFRAME (frame)))
+ Fredraw_frame (frame);
+}
+
\f
static struct frame_glyphs *
make_frame_glyphs (frame, empty)
#ifdef HAVE_X_WINDOWS
if (FRAME_X_P (frame))
{
- new->nruns = (int *) xmalloc (height * sizeof (int));
- new->face_list
- = (struct run **) xmalloc (height * sizeof (struct run *));
new->top_left_x = (short *) xmalloc (height * sizeof (short));
new->top_left_y = (short *) xmalloc (height * sizeof (short));
new->pix_width = (short *) xmalloc (height * sizeof (short));
new->pix_height = (short *) xmalloc (height * sizeof (short));
+ new->max_ascent = (short *) xmalloc (height * sizeof (short));
}
#endif
struct frame_glyphs *glyphs;
{
if (glyphs->total_contents)
- free (glyphs->total_contents);
+ xfree (glyphs->total_contents);
- free (glyphs->used);
- free (glyphs->glyphs);
- free (glyphs->highlight);
- free (glyphs->enable);
- free (glyphs->bufp);
+ xfree (glyphs->used);
+ xfree (glyphs->glyphs);
+ xfree (glyphs->highlight);
+ xfree (glyphs->enable);
+ xfree (glyphs->bufp);
#ifdef HAVE_X_WINDOWS
if (FRAME_X_P (frame))
{
- free (glyphs->nruns);
- free (glyphs->face_list);
- free (glyphs->top_left_x);
- free (glyphs->top_left_y);
- free (glyphs->pix_width);
- free (glyphs->pix_height);
+ xfree (glyphs->top_left_x);
+ xfree (glyphs->top_left_y);
+ xfree (glyphs->pix_width);
+ xfree (glyphs->pix_height);
+ xfree (glyphs->max_ascent);
}
#endif
- free (glyphs);
+ xfree (glyphs);
}
static void
free_frame_glyphs (frame, FRAME_TEMP_GLYPHS (frame));
if (FRAME_MESSAGE_BUF (frame))
- FRAME_MESSAGE_BUF (frame)
- = (char *) xrealloc (FRAME_MESSAGE_BUF (frame),
- FRAME_WIDTH (frame) + 1);
+ {
+ /* Reallocate the frame's message buffer; remember that
+ echo_area_glyphs may be pointing here. */
+ char *old_message_buf = FRAME_MESSAGE_BUF (frame);
+
+ FRAME_MESSAGE_BUF (frame)
+ = (char *) xrealloc (FRAME_MESSAGE_BUF (frame),
+ FRAME_WIDTH (frame) + 1);
+
+ if (echo_area_glyphs == old_message_buf)
+ echo_area_glyphs = FRAME_MESSAGE_BUF (frame);
+ if (previous_echo_glyphs == old_message_buf)
+ previous_echo_glyphs = FRAME_MESSAGE_BUF (frame);
+ }
else
FRAME_MESSAGE_BUF (frame)
= (char *) xmalloc (FRAME_WIDTH (frame) + 1);
if (!m->enable[vpos])
return 0;
- /* Give all lighlighted lines the same hash code
+ /* Give all highlighted lines the same hash code
so as to encourage scrolling to leave them in place. */
if (m->highlight[vpos])
return -1;
register struct frame_glyphs *desired_glyphs = FRAME_DESIRED_GLYPHS (frame);
register GLYPH *p;
- if (vpos < 0 || (! FRAME_VISIBLE_P (frame)))
+ if (vpos < 0)
abort ();
if ((desired_glyphs->enable[vpos]) && desired_glyphs->used[vpos] > hpos)
char *from, *to;
int size;
{
- register char *endf;
- register char *endt;
-
- if (size == 0)
+ if (size <= 0 || from == to)
return;
- /* If destination is higher in memory, and overlaps source zone,
- copy from the end. */
- if (from < to && from + size > to)
+ /* If the source and destination don't overlap, then bcopy can
+ handle it. If they do overlap, but the destination is lower in
+ memory than the source, we'll assume bcopy can handle that. */
+ if (to < from || from + size <= to)
+ bcopy (from, to, size);
+
+ /* Otherwise, we'll copy from the end. */
+ else
{
- endf = from + size;
- endt = to + size;
+ register char *endf = from + size;
+ register char *endt = to + size;
/* If TO - FROM is large, then we should break the copy into
nonoverlapping chunks of TO - FROM bytes each. However, if
TO - FROM is small, then the bcopy function call overhead
makes this not worth it. The crossover point could be about
- anywhere. Since I don't think the obvious copy loop is ever
- too bad, I'm trying to err in its favor. */
+ anywhere. Since I don't think the obvious copy loop is too
+ bad, I'm trying to err in its favor. */
if (to - from < 64)
{
do
}
else
{
- /* Since TO - FROM >= 64, the overlap is less than SIZE,
- so we can always safely do this loop once. */
- while (endt > to)
+ for (;;)
{
endt -= (to - from);
endf -= (to - from);
+ if (endt < to)
+ break;
+
bcopy (endf, endt, to - from);
}
-
- /* If TO - FROM wasn't a multiple of SIZE, there will be a
+
+ /* If SIZE wasn't a multiple of TO - FROM, there will be a
little left over. The amount left over is
(endt + (to - from)) - to, which is endt - from. */
bcopy (from, to, endt - from);
}
}
- else
- bcopy (from, to, size);
}
-#if 0
-void
-safe_bcopy (from, to, size)
- char *from, *to;
- int size;
-{
- register char *endf;
- register char *endt;
-
- if (size == 0)
- return;
-
- /* If destination is higher in memory, and overlaps source zone,
- copy from the end. */
- if (from < to && from + size > to)
- {
- endf = from + size;
- endt = to + size;
-
- do
- *--endt = *--endf;
- while (endf != from);
-
- return;
- }
-
- bcopy (from, to, size);
-}
-#endif
-
/* Rotate a vector of SIZE bytes right, by DISTANCE bytes.
DISTANCE may be negative. */
#ifdef HAVE_X_WINDOWS
if (FRAME_X_P (frame))
{
- safe_bcopy (current_frame->nruns + from,
- current_frame->nruns + from + amount,
- (end - from) * sizeof current_frame->nruns[0]);
-
- safe_bcopy (current_frame->face_list + from,
- current_frame->face_list + from + amount,
- (end - from) * sizeof current_frame->face_list[0]);
-
safe_bcopy (current_frame->top_left_x + from,
current_frame->top_left_x + from + amount,
(end - from) * sizeof current_frame->top_left_x[0]);
safe_bcopy (current_frame->pix_height + from,
current_frame->pix_height + from + amount,
(end - from) * sizeof current_frame->pix_height[0]);
+
+ safe_bcopy (current_frame->max_ascent + from,
+ current_frame->max_ascent + from + amount,
+ (end - from) * sizeof current_frame->max_ascent[0]);
}
#endif /* HAVE_X_WINDOWS */
#ifdef HAVE_X_WINDOWS
if (FRAME_X_P (frame))
{
- safe_bcopy (current_frame->nruns + from,
- current_frame->nruns + from + amount,
- (end - from) * sizeof current_frame->nruns[0]);
-
- safe_bcopy (current_frame->face_list + from,
- current_frame->face_list + from + amount,
- (end - from) * sizeof current_frame->face_list[0]);
-
safe_bcopy (current_frame->top_left_x + from,
current_frame->top_left_x + from + amount,
(end - from) * sizeof current_frame->top_left_x[0]);
safe_bcopy (current_frame->pix_height + from,
current_frame->pix_height + from + amount,
(end - from) * sizeof current_frame->pix_height[0]);
+
+ safe_bcopy (current_frame->max_ascent + from,
+ current_frame->max_ascent + from + amount,
+ (end - from) * sizeof current_frame->max_ascent[0]);
}
#endif /* HAVE_X_WINDOWS */
int len;
bcopy (current_frame->glyphs[vpos],
- desired_frame->glyphs[vpos], start);
+ desired_frame->glyphs[vpos],
+ start * sizeof (current_frame->glyphs[vpos]));
len = min (start, current_frame->used[vpos]);
if (desired_frame->used[vpos] < len)
desired_frame->used[vpos] = len;
= SPACEGLYPH;
bcopy (current_frame->glyphs[vpos] + end,
desired_frame->glyphs[vpos] + end,
- current_frame->used[vpos] - end);
+ ((current_frame->used[vpos] - end)
+ * sizeof (current_frame->glyphs[vpos])));
desired_frame->used[vpos] = current_frame->used[vpos];
}
}
They may return 0 meaning nothing was done if anything is difficult,
or 1 meaning the output was performed properly.
They assume that the frame was up to date before the buffer
- change being displayed. THey make various other assumptions too;
+ change being displayed. They make various other assumptions too;
see command_loop_1 where these are called. */
int
#endif /* COMPILER_REGISTER_BUG */
int vpos = FRAME_CURSOR_Y (frame);
- /* Give up if about to continue line */
- if (hpos - XFASTINT (w->left) + 1 + 1 >= XFASTINT (w->width)
-
+ /* Give up if about to continue line. */
+ if (hpos >= XFASTINT (w->left) + window_internal_width (w) - 1
+
/* Avoid losing if cursor is in invisible text off left margin */
|| (XINT (w->hscroll) && hpos == XFASTINT (w->left))
|| (MINI_WINDOW_P (w) && echo_area_glyphs))
return 0;
- current_frame->glyphs[vpos][hpos] = g;
+ {
+#ifdef HAVE_X_WINDOWS
+ int dummy;
+ int face = compute_char_face (frame, w, point, -1, -1, &dummy);
+#else
+ int face = 0;
+#endif
+
+ current_frame->glyphs[vpos][hpos] = MAKE_GLYPH (g, face);
+ }
unchanged_modified = MODIFF;
beg_unchanged = GPT - BEG;
XFASTINT (w->last_point) = point;
if ((FRAME_CURSOR_X (frame) == XFASTINT (w->left)
&& (XINT (w->hscroll) || n < 0))
|| (n > 0
- && (FRAME_CURSOR_X (frame) + 1
- >= (XFASTINT (w->left) + XFASTINT (w->width)
- - (XFASTINT (w->width) < FRAME_WIDTH (frame))
- - 1)))
+ && (FRAME_CURSOR_X (frame) + 1 >= window_internal_width (w) - 1))
|| cursor_in_echo_area)
return 0;
+ /* Can't use direct output if highlighting a region. */
+ if (!NILP (Vtransient_mark_mode) && !NILP (current_buffer->mark_active))
+ return 0;
+
FRAME_CURSOR_X (frame) += n;
XFASTINT (w->last_point_x) = FRAME_CURSOR_X (frame);
XFASTINT (w->last_point) = point;
register int downto, leftmost;
#endif
+ if (preempt_count <= 0)
+ preempt_count = 1;
+
if (FRAME_HEIGHT (f) == 0) abort (); /* Some bug zeros some core */
detect_input_pending ();
current_frame->top_left_x[FRAME_HEIGHT (f) - 1] = leftmost;
current_frame->top_left_y[FRAME_HEIGHT (f) - 1]
= PIXEL_HEIGHT (f) - f->display.x->internal_border_width
- - LINE_HEIGHT(f, FRAME_HEIGHT (f) - 1);
+ - current_frame->pix_height[FRAME_HEIGHT (f) - 1];
current_frame->top_left_x[0] = leftmost;
current_frame->top_left_y[0] = downto;
}
outq = PENDING_OUTPUT_COUNT (stdout);
#endif
outq *= 10;
- sleep (outq / baud_rate);
+ if (baud_rate > 0)
+ sleep (outq / baud_rate);
}
}
if ((i - 1) % preempt_count == 0)
#ifdef HAVE_X_WINDOWS
if (FRAME_X_P (f))
- downto += LINE_HEIGHT(f, i);
+ downto += current_frame->pix_height[i];
#endif
}
pause = (i < FRAME_HEIGHT (f) - 1) ? i : 0;
/* The actual width of the window is window->width less one for the
DISP_CONTINUE_GLYPH, and less one if it's not the rightmost
window. */
- int window_width = (XFASTINT (window->width) - 1
- - (XFASTINT (window->width) + window_left
- != FRAME_WIDTH (XFRAME (window->frame))));
+ int window_width = window_internal_width (window) - 1;
int startp = marker_position (window->start);
posn = compute_motion (startp, 0,
(window == XWINDOW (minibuf_window) && startp == 1
? minibuf_prompt_width : 0),
- ZV, line, col - window_left,
+ ZV, line, col,
window_width, XINT (window->hscroll), 0);
current_buffer = old_current_buffer;
register GLYPH *r;
{
register GLYPH *p = r;
- while (*r++ == SPACEGLYPH);
- return r - p - 1;
+ while (*p++ == SPACEGLYPH);
+ return p - r - 1;
}
static int
/* Char insertion/deletion cost vector, from term.c */
extern int *char_ins_del_vector;
-#define char_ins_del_cost(f) (&char_ins_del_vector[FRAME_HEIGHT((f))])
+#define char_ins_del_cost(f) (&char_ins_del_vector[FRAME_WIDTH((f))])
static void
update_line (frame, vpos)
later outside of the signal handler. */
{
- Lisp_Object tail;
- FRAME_PTR f;
+ Lisp_Object tail, frame;
- FOR_EACH_FRAME (tail, f)
+ FOR_EACH_FRAME (tail, frame)
{
- if (FRAME_TERMCAP_P (f))
+ if (FRAME_TERMCAP_P (XFRAME (frame)))
{
- change_frame_size (f, height, width, 0, 1);
+ change_frame_size (XFRAME (frame), height, width, 0, 1);
break;
}
}
/* If window_change_signal should have run before, run it now. */
while (delayed_size_change)
{
- Lisp_Object tail;
- FRAME_PTR f;
+ Lisp_Object tail, frame;
delayed_size_change = 0;
- FOR_EACH_FRAME (tail, f)
+ FOR_EACH_FRAME (tail, frame)
{
+ FRAME_PTR f = XFRAME (frame);
+
int height = FRAME_NEW_HEIGHT (f);
int width = FRAME_NEW_WIDTH (f);
-
- FRAME_NEW_HEIGHT (f) = 0;
- FRAME_NEW_WIDTH (f) = 0;
- if (height != 0)
+ if (height != 0 || width != 0)
change_frame_size (f, height, width, 0, 0);
}
}
FRAME_NEW_HEIGHT (frame) = 0;
FRAME_NEW_WIDTH (frame) = 0;
- /* If an arguments is zero, set it to the current value. */
+ /* If an argument is zero, set it to the current value. */
newheight || (newheight = FRAME_HEIGHT (frame));
newwidth || (newwidth = FRAME_WIDTH (frame));
{
/* Frame has both root and minibuffer. */
set_window_height (FRAME_ROOT_WINDOW (frame),
- newheight - 1, 0);
+ newheight - 1 - FRAME_MENU_BAR_LINES (frame), 0);
XFASTINT (XWINDOW (FRAME_MINIBUF_WINDOW (frame))->top)
= newheight - 1;
set_window_height (FRAME_MINIBUF_WINDOW (frame), 1, 0);
}
else
/* Frame has just one top-level window. */
- set_window_height (FRAME_ROOT_WINDOW (frame), newheight, 0);
+ set_window_height (FRAME_ROOT_WINDOW (frame),
+ newheight - FRAME_MENU_BAR_LINES (frame), 0);
if (FRAME_TERMCAP_P (frame) && !pretend)
FrameRows = newheight;
}
DEFUN ("sleep-for", Fsleep_for, Ssleep_for, 1, 2, 0,
- "Pause, without updating display, for ARG seconds.\n\
-Optional second arg non-nil means ARG is measured in milliseconds.\n\
-\(Not all operating systems support milliseconds.)")
- (arg, millisec)
- Lisp_Object arg, millisec;
+ "Pause, without updating display, for SECONDS seconds.\n\
+SECONDS may be a floating-point value, meaning that you can wait for a\n\
+fraction of a second. Optional second arg MILLISECONDS specifies an\n\
+additional wait period, in milliseconds; this may be useful if your\n\
+Emacs was built without floating point support.\n\
+\(Not all operating systems support waiting for a fraction of a second.)")
+ (seconds, milliseconds)
+ Lisp_Object seconds, milliseconds;
{
- int usec = 0;
- int sec;
+ int sec, usec;
- CHECK_NUMBER (arg, 0);
- sec = XINT (arg);
- if (sec <= 0)
- return Qnil;
+ if (NILP (milliseconds))
+ XSET (milliseconds, Lisp_Int, 0);
+ else
+ CHECK_NUMBER (milliseconds, 1);
+ usec = XINT (milliseconds) * 1000;
- if (!NILP (millisec))
- {
-#ifndef EMACS_HAS_USECS
- error ("millisecond `sleep-for' not supported on %s", SYSTEM_TYPE);
+#ifdef LISP_FLOAT_TYPE
+ {
+ double duration = extract_float (seconds);
+ sec = (int) duration;
+ usec += (duration - sec) * 1000000;
+ }
#else
- usec = sec % 1000 * 1000;
- sec /= 1000;
+ CHECK_NUMBER (seconds, 0);
+ sec = XINT (seconds);
#endif
+
+#ifndef EMACS_HAS_USECS
+ if (sec == 0 && usec != 0)
+ error ("millisecond `sleep-for' not supported on %s", SYSTEM_TYPE);
+#endif
+
+ /* Assure that 0 <= usec < 1000000. */
+ if (usec < 0)
+ {
+ /* We can't rely on the rounding being correct if user is negative. */
+ if (-1000000 < usec)
+ sec--, usec += 1000000;
+ else
+ sec -= -usec / 1000000, usec = 1000000 - (-usec % 1000000);
}
+ else
+ sec += usec / 1000000, usec %= 1000000;
+
+ if (sec < 0)
+ return Qnil;
{
Lisp_Object zero;
wait_reading_process_input (sec, usec, zero, 0);
}
-#if 0 /* No wait_reading_process_input */
+ /* We should always have wait_reading_process_input; we have a dummy
+ implementation for systems which don't support subprocesses. */
+#if 0
+ /* No wait_reading_process_input */
immediate_quit = 1;
QUIT;
return Qt;
#ifdef SIGIO
- gobble_input ();
+ gobble_input (0);
#endif
XSET (read_kbd, Lisp_Int, reading ? -1 : 1);
wait_reading_process_input (sec, usec, read_kbd, display);
-#if 0 /* No wait_reading_process_input available. */
+ /* wait_reading_process_input should always be available now; it is
+ simulated in a simple way on systems that don't support
+ subprocesses. */
+#if 0
+ /* No wait_reading_process_input available. */
immediate_quit = 1;
QUIT;
}
DEFUN ("sit-for", Fsit_for, Ssit_for, 1, 3, 0,
- "Perform redisplay, then wait for ARG seconds or until input is available.\n\
-Optional second arg non-nil means ARG counts in milliseconds.\n\
+ "Perform redisplay, then wait for SECONDS seconds or until input is available.\n\
+SECONDS may be a floating-point value, meaning that you can wait for a\n\
+fraction of a second. Optional second arg MILLISECONDS specifies an\n\
+additional wait period, in milliseconds; this may be useful if your\n\
+Emacs was built without floating point support.\n\
+\(Not all operating systems support waiting for a fraction of a second.)\n\
Optional third arg non-nil means don't redisplay, just wait for input.\n\
Redisplay is preempted as always if input arrives, and does not happen\n\
if input is available before it starts.\n\
Value is t if waited the full time with no input arriving.")
- (arg, millisec, nodisp)
- Lisp_Object arg, millisec, nodisp;
+ (seconds, milliseconds, nodisp)
+ Lisp_Object seconds, milliseconds, nodisp;
{
- int usec = 0;
- int sec;
+ int sec, usec;
- CHECK_NUMBER (arg, 0);
- sec = XINT (arg);
+ if (NILP (milliseconds))
+ XSET (milliseconds, Lisp_Int, 0);
+ else
+ CHECK_NUMBER (milliseconds, 1);
+ usec = XINT (milliseconds) * 1000;
- if (!NILP (millisec))
- {
-#ifndef EMACS_HAS_USECS
- error ("millisecond `sit-for' not supported on %s", SYSTEM_TYPE);
+#ifdef LISP_FLOAT_TYPE
+ {
+ double duration = extract_float (seconds);
+ sec = (int) duration;
+ usec += (duration - sec) * 1000000;
+ }
#else
- usec = (sec % 1000) * 1000;
- sec /= 1000;
+ CHECK_NUMBER (seconds, 0);
+ sec = XINT (seconds);
#endif
- }
-
- return sit_for (sec, usec, 0, NILP (nodisp));
-}
-
-DEFUN ("sleep-for-millisecs", Fsleep_for_millisecs, Ssleep_for_millisecs,
- 1, 1, 0,
- "Pause, without updating display, for ARG milliseconds.")
- (arg)
- Lisp_Object arg;
-{
- Lisp_Object zero;
#ifndef EMACS_HAS_USECS
- error ("sleep-for-millisecs not supported on %s", SYSTEM_TYPE);
-#else
- CHECK_NUMBER (arg, 0);
+ if (usec != 0 && sec == 0)
+ error ("millisecond `sit-for' not supported on %s", SYSTEM_TYPE);
+#endif
- XFASTINT (zero) = 0;
- wait_reading_process_input (XINT (arg) / 1000, XINT (arg) % 1000 * 1000,
- zero, 0);
- return Qnil;
-#endif /* EMACS_HAS_USECS */
+ return sit_for (sec, usec, 0, NILP (nodisp));
}
\f
char *terminal_type;
cursor_in_echo_area = 0;
terminal_type = (char *) 0;
- /* If the DISPLAY environment variable is set, try to use X, and
- die with an error message if that doesn't work. */
+ /* Now is the time to initialize this; it's used by init_sys_modes
+ during startup. */
+ Vwindow_system = Qnil;
- /* Check if we're using a window system here before trying to
- initialize the terminal. If we check the terminal first,
+ /* If the user wants to use a window system, we shouldn't bother
+ initializing the terminal. This is especially important when the
+ terminal is so dumb that emacs gives up before and doesn't bother
+ using the window system.
- If someone has indicated that they want
- to use a window system, we shouldn't bother initializing the
- terminal. This is especially important when the terminal is so
- dumb that emacs gives up before and doesn't bother using the window
- system. */
+ If the DISPLAY environment variable is set, try to use X, and die
+ with an error message if that doesn't work. */
#ifdef HAVE_X_WINDOWS
- if (!inhibit_window_system && (display_arg || getenv ("DISPLAY")))
+ if (! display_arg)
+ {
+#ifdef VMS
+ display_arg = (getenv ("DECW$DISPLAY") != 0);
+#else
+ display_arg = (getenv ("DISPLAY") != 0);
+#endif
+ }
+
+ if (!inhibit_window_system && display_arg)
{
Vwindow_system = intern ("x");
#ifdef HAVE_X11
HCoop / bpt / emacs.git / blobdiff