XIint.h revision 06c34b88 
1/*
2 *	XIint.h - Header definition and support file for the internal
3 *	support routines used by the Xi library.
4 */
5
6#ifndef _XIINT_H_
7#define _XIINT_H_
8#include <X11/extensions/XI.h>
9
10/* inputproto 2.0 still shipped with these defined in the proto headers */
11#ifndef XInput_Initial_Release
12/* Indices into the versions[] array (XExtInt.c). Used as a index to
13 * retrieve the minimum version of XI from _XiCheckExtInit */
14#define Dont_Check			0
15#define XInput_Initial_Release		1
16#define XInput_Add_XDeviceBell		2
17#define XInput_Add_XSetDeviceValuators	3
18#define XInput_Add_XChangeDeviceControl	4
19#define XInput_Add_DevicePresenceNotify	5
20#define XInput_Add_DeviceProperties	6
21#define XInput_2_0			7
22#endif
23#define XInput_2_1			8
24#define XInput_2_2			9
25#define XInput_2_3			10
26
27extern XExtDisplayInfo *XInput_find_display(Display *);
28
29extern int _XiCheckExtInit(Display *, int, XExtDisplayInfo *);
30extern int _XiCheckVersion(XExtDisplayInfo *info, int version_index);
31
32extern XExtensionVersion *_XiGetExtensionVersion(Display *, _Xconst char *, XExtDisplayInfo *);
33extern XExtensionVersion* _XiGetExtensionVersionRequest(Display *dpy, _Xconst char *name, int xi_opcode);
34extern Status _xiQueryVersion(Display *dpy, int*, int*, XExtDisplayInfo *);
35
36extern Status _XiEventToWire(
37    register Display *		/* dpy */,
38    register XEvent *		/* re */,
39    register xEvent **		/* event */,
40    register int *		/* count */
41);
42
43typedef struct _XInputData
44{
45    XEvent data;
46    XExtensionVersion *vers;
47} XInputData;
48
49
50/**
51 * Returns the next valid memory block of the given size within the block
52 * previously allocated.
53 * Use letting pointers inside a struct point to bytes after the same
54 * struct, e.g. during protocol parsing etc.
55 *
56 * Caller is responsible for allocating enough memory.
57 *
58 * Example:
59 *    void *ptr;
60 *    struct foo {
61 *       int num_a;
62 *       int num_b;
63 *       int *a;
64 *       int *b;
65 *    } bar;
66 *
67 *    ptr = malloc(large_enough);
68 *    bar = next_block(&ptr, sizeof(struct foo));
69 *    bar->num_a = 10;
70 *    bar->num_b = 20;
71 *    bar->a = next_block(&ptr, bar->num_a);
72 *    bar->b = next_block(&ptr, bar->num_b);
73 */
74static inline void*
75next_block(void **ptr, int size) {
76    void *ret = *ptr;
77
78    if (!*ptr)
79        return NULL;
80
81    *(unsigned char**)ptr += size;
82
83    return ret;
84}
85
86#ifndef HAVE__XEATDATAWORDS
87#include <X11/Xmd.h>  /* for LONG64 on 64-bit platforms */
88#include <limits.h>
89
90static inline void _XEatDataWords(Display *dpy, unsigned long n)
91{
92# ifndef LONG64
93    if (n >= (ULONG_MAX >> 2))
94        _XIOError(dpy);
95# endif
96    _XEatData (dpy, n << 2);
97}
98#endif
99
100#endif
101