| File: | plugins/clipboard/xutils.c |
| Warning: | line 87, column 25 Casting a non-structure type to a structure type and accessing a field can lead to memory access errors or data corruption |
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| 1 | /* |
| 2 | * Copyright © 2004 Red Hat, Inc. |
| 3 | * |
| 4 | * Permission to use, copy, modify, distribute, and sell this software and its |
| 5 | * documentation for any purpose is hereby granted without fee, provided that |
| 6 | * the above copyright notice appear in all copies and that both that |
| 7 | * copyright notice and this permission notice appear in supporting |
| 8 | * documentation, and that the name of Red Hat not be used in advertising or |
| 9 | * publicity pertaining to distribution of the software without specific, |
| 10 | * written prior permission. Red Hat makes no representations about the |
| 11 | * suitability of this software for any purpose. It is provided "as is" |
| 12 | * without express or implied warranty. |
| 13 | * |
| 14 | * RED HAT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL |
| 15 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL RED HAT |
| 16 | * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 17 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION |
| 18 | * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN |
| 19 | * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 20 | * |
| 21 | * Author: Matthias Clasen, Red Hat, Inc. |
| 22 | */ |
| 23 | |
| 24 | #include <stdlib.h> |
| 25 | |
| 26 | #include "xutils.h" |
| 27 | |
| 28 | Atom XA_ATOM_PAIR; |
| 29 | Atom XA_CLIPBOARD_MANAGER; |
| 30 | Atom XA_CLIPBOARD; |
| 31 | Atom XA_DELETE; |
| 32 | Atom XA_INCR; |
| 33 | Atom XA_INSERT_PROPERTY; |
| 34 | Atom XA_INSERT_SELECTION; |
| 35 | Atom XA_MANAGER; |
| 36 | Atom XA_MULTIPLE; |
| 37 | Atom XA_NULL; |
| 38 | Atom XA_SAVE_TARGETS; |
| 39 | Atom XA_TARGETS; |
| 40 | Atom XA_TIMESTAMP; |
| 41 | |
| 42 | unsigned long SELECTION_MAX_SIZE = 0; |
| 43 | |
| 44 | |
| 45 | void |
| 46 | init_atoms (Display *display) |
| 47 | { |
| 48 | unsigned long max_request_size; |
| 49 | |
| 50 | if (SELECTION_MAX_SIZE > 0) |
| 51 | return; |
| 52 | |
| 53 | XA_ATOM_PAIR = XInternAtom (display, "ATOM_PAIR", False0); |
| 54 | XA_CLIPBOARD_MANAGER = XInternAtom (display, "CLIPBOARD_MANAGER", False0); |
| 55 | XA_CLIPBOARD = XInternAtom (display, "CLIPBOARD", False0); |
| 56 | XA_DELETE = XInternAtom (display, "DELETE", False0); |
| 57 | XA_INCR = XInternAtom (display, "INCR", False0); |
| 58 | XA_INSERT_PROPERTY = XInternAtom (display, "INSERT_PROPERTY", False0); |
| 59 | XA_INSERT_SELECTION = XInternAtom (display, "INSERT_SELECTION", False0); |
| 60 | XA_MANAGER = XInternAtom (display, "MANAGER", False0); |
| 61 | XA_MULTIPLE = XInternAtom (display, "MULTIPLE", False0); |
| 62 | XA_NULL = XInternAtom (display, "NULL", False0); |
| 63 | XA_SAVE_TARGETS = XInternAtom (display, "SAVE_TARGETS", False0); |
| 64 | XA_TARGETS = XInternAtom (display, "TARGETS", False0); |
| 65 | XA_TIMESTAMP = XInternAtom (display, "TIMESTAMP", False0); |
| 66 | |
| 67 | max_request_size = XExtendedMaxRequestSize (display); |
| 68 | if (max_request_size == 0) |
| 69 | max_request_size = XMaxRequestSize (display); |
| 70 | |
| 71 | SELECTION_MAX_SIZE = max_request_size - 100; |
| 72 | if (SELECTION_MAX_SIZE > 262144) |
| 73 | SELECTION_MAX_SIZE = 262144; |
| 74 | } |
| 75 | |
| 76 | typedef struct |
| 77 | { |
| 78 | Window window; |
| 79 | Atom timestamp_prop_atom; |
| 80 | } TimeStampInfo; |
| 81 | |
| 82 | static Boolint |
| 83 | timestamp_predicate (Display *display, |
| 84 | XEvent *xevent, |
| 85 | XPointer arg) |
| 86 | { |
| 87 | TimeStampInfo *info = (TimeStampInfo *)arg; |
Casting a non-structure type to a structure type and accessing a field can lead to memory access errors or data corruption | |
| 88 | |
| 89 | if (xevent->type == PropertyNotify28 && |
| 90 | xevent->xproperty.window == info->window && |
| 91 | xevent->xproperty.atom == info->timestamp_prop_atom) |
| 92 | return True1; |
| 93 | |
| 94 | return False0; |
| 95 | } |
| 96 | |
| 97 | Time |
| 98 | get_server_time (Display *display, |
| 99 | Window window) |
| 100 | { |
| 101 | unsigned char c = 'a'; |
| 102 | XEvent xevent; |
| 103 | TimeStampInfo info; |
| 104 | |
| 105 | info.timestamp_prop_atom = XInternAtom (display, "_TIMESTAMP_PROP", False0); |
| 106 | info.window = window; |
| 107 | |
| 108 | XChangeProperty (display, window, |
| 109 | info.timestamp_prop_atom, info.timestamp_prop_atom, |
| 110 | 8, PropModeReplace0, &c, 1); |
| 111 | |
| 112 | XIfEvent (display, &xevent, |
| 113 | timestamp_predicate, (XPointer)&info); |
| 114 | |
| 115 | return xevent.xproperty.time; |
| 116 | } |
| 117 |