1/*
2
3Copyright 1992, 1998  The Open Group
4
5Permission to use, copy, modify, distribute, and sell this software and its
6documentation for any purpose is hereby granted without fee, provided that
7the above copyright notice appear in all copies and that both that
8copyright notice and this permission notice appear in supporting
9documentation.
10
11The above copyright notice and this permission notice shall be included
12in all copies or substantial portions of the Software.
13
14THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
15OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
16MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
17IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
18OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20OTHER DEALINGS IN THE SOFTWARE.
21
22Except as contained in this notice, the name of The Open Group shall
23not be used in advertising or otherwise to promote the sale, use or
24other dealings in this Software without prior written authorization
25from The Open Group.
26
27*/
28
29#ifdef HAVE_CONFIG_H
30#include <config.h>
31#endif
32#include <X11/Xlibint.h>
33#include <X11/Xos.h>
34
35/*
36 * Xlib's _XAsyncErrorState sequence number may wrap in 32bit
37 * and we cannot use 64bit as it's public API.
38 */
39#ifdef LONG64
40#define _XLIB_ASYNC_SEQUENCE_CMP(a,op,b)     ((a == 0) || (a op b))
41#else /* !LONG64 */
42#define _XLIB_ASYNC_SEQUENCE_CMP(a,op,b)     ((a == 0) || \
43                                              (((a op b) && (b - a op (UINT32_MAX >> 1))) || \
44                                               ((b op a) && ((UINT32_MAX >> 1) op a - b))))
45#endif /* !LONG64 */
46
47/*ARGSUSED*/
48Bool
49_XAsyncErrorHandler(
50    register Display *dpy,
51    register xReply *rep,
52    char *buf,
53    int len,
54    XPointer data)
55{
56    register _XAsyncErrorState *state;
57
58    state = (_XAsyncErrorState *)data;
59    if (rep->generic.type == X_Error &&
60	(!state->error_code ||
61	 rep->error.errorCode == state->error_code) &&
62	(!state->major_opcode ||
63	 rep->error.majorCode == state->major_opcode) &&
64	(!state->minor_opcode ||
65	 rep->error.minorCode == state->minor_opcode) &&
66	(_XLIB_ASYNC_SEQUENCE_CMP(state->min_sequence_number,<=,dpy->last_request_read)) &&
67	(_XLIB_ASYNC_SEQUENCE_CMP(state->max_sequence_number,>=,dpy->last_request_read))) {
68	state->last_error_received = rep->error.errorCode;
69	state->error_count++;
70	return True;
71    }
72    return False;
73}
74
75void _XDeqAsyncHandler(
76    Display *dpy,
77    register _XAsyncHandler *handler)
78{
79    register _XAsyncHandler **prev;
80    register _XAsyncHandler *async;
81
82    for (prev = &dpy->async_handlers;
83	 (async = *prev) && (async != handler);
84	 prev = &async->next)
85	;
86    if (async)
87	*prev = async->next;
88}
89
90char *
91_XGetAsyncReply(
92    register Display *dpy,
93    register char *replbuf,	/* data is read into this buffer */
94    register xReply *rep,	/* value passed to calling handler */
95    char *buf,			/* value passed to calling handler */
96    int len,			/* value passed to calling handler */
97    int extra,			/* extra words to read, ala _XReply */
98    Bool discard)		/* discard after extra?, ala _XReply */
99{
100    if (extra == 0) {
101	if (discard && (rep->generic.length << 2) > len)
102	    _XEatData (dpy, (rep->generic.length << 2) - len);
103	return (char *)rep;
104    }
105
106    if (extra <= rep->generic.length) {
107	int size = SIZEOF(xReply) + (extra << 2);
108	if (size > len) {
109	    memcpy(replbuf, buf, len);
110	    _XRead(dpy, replbuf + len, size - len);
111	    buf = replbuf;
112	    len = size;
113	}
114
115	if (discard && rep->generic.length > extra &&
116	    (rep->generic.length << 2) > len)
117	    _XEatData (dpy, (rep->generic.length << 2) - len);
118
119	return buf;
120    }
121    /*
122     *if we get here, then extra > rep->generic.length--meaning we
123     * read a reply that's shorter than we expected.  This is an
124     * error,  but we still need to figure out how to handle it...
125     */
126    if ((rep->generic.length << 2) > len)
127	_XEatData (dpy, (rep->generic.length << 2) - len);
128    _XIOError (dpy);
129    return (char *)rep;
130}
131
132void
133_XGetAsyncData(
134    Display *dpy,
135    char *data,			/* data is read into this buffer */
136    char *buf,			/* value passed to calling handler */
137    int len,			/* value passed to calling handler */
138    int skip,			/* number of bytes already read in previous
139				   _XGetAsyncReply or _XGetAsyncData calls */
140    int datalen,		/* size of data buffer in bytes */
141    int discardtotal)		/* min. bytes to consume (after skip) */
142{
143    buf += skip;
144    len -= skip;
145    if (!data) {
146	if (datalen > len)
147	    _XEatData(dpy, datalen - len);
148    } else if (datalen <= len) {
149	memcpy(data, buf, datalen);
150    } else {
151	memcpy(data, buf, len);
152	_XRead(dpy, data + len, datalen - len);
153    }
154    if (discardtotal > len) {
155	if (datalen > len)
156	    len = datalen;
157	_XEatData(dpy, discardtotal - len);
158    }
159}
160