XIint.h revision c27c18e8 
1/* $XFree86: xc/lib/Xi/XIint.h,v 3.2 2003/07/07 15:34:22 eich Exp $ */
2
3/*
4 *	XIint.h - Header definition and support file for the internal
5 *	support routines used by the Xi library.
6 */
7
8#ifndef _XIINT_H_
9#define _XIINT_H_
10#include <X11/extensions/XI.h>
11
12extern XExtDisplayInfo *XInput_find_display(Display *);
13
14extern int _XiCheckExtInit(Display *, int, XExtDisplayInfo *);
15
16extern XExtensionVersion *_XiGetExtensionVersion(Display *, _Xconst char *, XExtDisplayInfo *);
17extern Status _xiQueryVersion(Display *dpy, int*, int*, XExtDisplayInfo *);
18
19extern Status _XiEventToWire(
20    register Display *		/* dpy */,
21    register XEvent *		/* re */,
22    register xEvent **		/* event */,
23    register int *		/* count */
24);
25
26typedef struct _XInputData
27{
28    XEvent data;
29    XExtensionVersion *vers;
30} XInputData;
31
32
33/**
34 * Returns the next valid memory block of the given size within the block
35 * previously allocated.
36 * Use letting pointers inside a struct point to bytes after the same
37 * struct, e.g. during protocol parsing etc.
38 *
39 * Caller is responsible for allocating enough memory.
40 *
41 * Example:
42 *    void *ptr;
43 *    struct foo {
44 *       int num_a;
45 *       int num_b;
46 *       int *a;
47 *       int *b;
48 *    } bar;
49 *
50 *    ptr = malloc(large_enough);
51 *    bar = next_block(&ptr, sizeof(struct foo));
52 *    bar->num_a = 10;
53 *    bar->num_b = 20;
54 *    bar->a = next_block(&ptr, bar->num_a);
55 *    bar->b = next_block(&ptr, bar->num_b);
56 */
57static inline void*
58next_block(void **ptr, int size) {
59    void *ret = *ptr;
60
61    if (!*ptr)
62        return NULL;
63
64    *(unsigned char**)ptr += size;
65
66    return ret;
67}
68
69#endif
70