1 /*
2 * x11.c
3 * X11-specific stuff
4 * AYM 1999-08-03
5 */
6
7
8 /*
9 This file is part of Yadex.
10
11 Yadex incorporates code from DEU 5.21 that was put in the public domain in
12 1994 by Rapha�l Quinet and Brendon Wyber.
13
14 The rest of Yadex is Copyright � 1997-2003 Andr� Majorel and others.
15
16 This program is free software; you can redistribute it and/or modify it under
17 the terms of the GNU General Public License as published by the Free Software
18 Foundation; either version 2 of the License, or (at your option) any later
19 version.
20
21 This program is distributed in the hope that it will be useful, but WITHOUT
22 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
23 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
24
25 You should have received a copy of the GNU General Public License along with
26 this program; if not, write to the Free Software Foundation, Inc., 59 Temple
27 Place, Suite 330, Boston, MA 02111-1307, USA.
28 */
29
30
31 #include "yadex.h"
32 #ifdef Y_X11
33 #include <X11/Xlib.h>
34 #include <X11/Xutil.h>
35 #include "gfx.h"
36 #include "x11.h"
37
38
39 static bool _have_error = false;
40 static unsigned char _error_code;
41
42
43 /*
44 * x_bell
45 * Ring the bell
46 */
x_bell()47 void x_bell ()
48 {
49 if (dpy)
50 XBell (dpy, 0);
51 else
52 nf_bug ("x_bell: not connected");
53 }
54
55
56 /*
57 * x_catch_on
58 * Setup things so that from now on, any X protocol errors
59 * will be handled by x_error_handler instead of the
60 * default handler (that has the annoying property of
61 * calling exit()).
62 */
x_catch_on()63 void x_catch_on ()
64 {
65 XSetErrorHandler (x_error_handler);
66 XSynchronize (dpy, True);
67 x_clear_error ();
68 }
69
70
71 /*
72 * x_catch_off
73 * Restore the default error handler.
74 */
x_catch_off()75 void x_catch_off ()
76 {
77 XSynchronize (dpy, False);
78 XSetErrorHandler (0);
79 }
80
81
82 /*
83 * x_error_handler
84 * An error handler that does not exit.
85 */
x_error_handler(Display * dpy,XErrorEvent * e)86 int x_error_handler (Display *dpy, XErrorEvent *e)
87 {
88 _have_error = true;
89 _error_code = e->error_code; // We're only interested in the error code
90 return 0;
91 }
92
93
94 /*
95 * x_clear_error
96 * Call this before attempting an operation that might
97 * cause an error that you want to catch.
98 */
x_clear_error()99 void x_clear_error ()
100 {
101 _have_error = false;
102 }
103
104
105 /*
106 * x_error
107 * Return a string corresponding to the last error caught
108 * or a NULL pointer if no error has occured since last
109 * call to x_clear_error().
110 */
x_error()111 const char *x_error ()
112 {
113 if (! _have_error)
114 return 0;
115 static char buf[100];
116 XGetErrorText (dpy, _error_code, buf, sizeof buf);
117 return buf;
118 }
119
120
121 #endif /* DO NOT ADD ANYTHING AFTER THIS LINE */
122