/*

Copyright 1992, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its

documentation for any purpose is hereby granted without fee, provided that

the above copyright notice appear in all copies and that both that

copyright notice and this permission notice appear in supporting

documentation.

The above copyright notice and this permission notice shall be included

in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.

IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR

OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,

ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR

OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of The Open Group shall

not be used in advertising or otherwise to promote the sale, use or

other dealings in this Software without prior written authorization

from The Open Group.

*/

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

#include <X11/Xlibint.h>

#include <X11/Xos.h>

/*

 * Xlib's _XAsyncErrorState sequence number may wrap in 32bit

 * and we cannot use 64bit as it's public API.

 */

#ifdef LONG64

#define _XLIB_ASYNC_SEQUENCE_CMP(a,op,b)     ((a == 0) || (a op b))

#else /* !LONG64 */

#define _XLIB_ASYNC_SEQUENCE_CMP(a,op,b)     ((a == 0) || \

                                              (((a op b) && (b - a op (UINT32_MAX >> 1))) || \

                                               ((b op a) && ((UINT32_MAX >> 1) op a - b))))

#endif /* !LONG64 */

/*ARGSUSED*/

Bool

_XAsyncErrorHandler(

    register Display *dpy,

    register xReply *rep,

    char *buf,

    int len,

    XPointer data)

{

    register _XAsyncErrorState *state;

    state = (_XAsyncErrorState *)data;

    if (rep->generic.type == X_Error &&

	(!state->error_code ||

	 rep->error.errorCode == state->error_code) &&

	(!state->major_opcode ||

	 rep->error.majorCode == state->major_opcode) &&

	(!state->minor_opcode ||

	 rep->error.minorCode == state->minor_opcode) &&

	(_XLIB_ASYNC_SEQUENCE_CMP(state->min_sequence_number,<=,dpy->last_request_read)) &&

	(_XLIB_ASYNC_SEQUENCE_CMP(state->max_sequence_number,>=,dpy->last_request_read))) {

	state->last_error_received = rep->error.errorCode;

	state->error_count++;

	return True;

    }

    return False;

}

void _XDeqAsyncHandler(

    Display *dpy,

    register _XAsyncHandler *handler)

{

    register _XAsyncHandler **prev;

    register _XAsyncHandler *async;

    for (prev = &dpy->async_handlers;

	 (async = *prev) && (async != handler);

	 prev = &async->next)

	;

    if (async)

	*prev = async->next;

}

char *

_XGetAsyncReply(

    register Display *dpy,

    register char *replbuf,	/* data is read into this buffer */

    register xReply *rep,	/* value passed to calling handler */

    char *buf,			/* value passed to calling handler */

    int len,			/* value passed to calling handler */

    int extra,			/* extra words to read, ala _XReply */

    Bool discard)		/* discard after extra?, ala _XReply */

{

    if (extra == 0) {

	if (discard && (rep->generic.length << 2) > len)

	    _XEatData (dpy, (rep->generic.length << 2) - len);

	return (char *)rep;

    }

    if (extra <= rep->generic.length) {

	int size = SIZEOF(xReply) + (extra << 2);

	if (size > len) {

	    memcpy(replbuf, buf, len);

	    _XRead(dpy, replbuf + len, size - len);

	    buf = replbuf;

	    len = size;

	}

	if (discard && rep->generic.length > extra &&

	    (rep->generic.length << 2) > len)

	    _XEatData (dpy, (rep->generic.length << 2) - len);

	return buf;

    }

    /*

     *if we get here, then extra > rep->generic.length--meaning we

     * read a reply that's shorter than we expected.  This is an

     * error,  but we still need to figure out how to handle it...

     */

    if ((rep->generic.length << 2) > len)

	_XEatData (dpy, (rep->generic.length << 2) - len);

    _XIOError (dpy);

    return (char *)rep;

}

void

_XGetAsyncData(

    Display *dpy,

    char *data,			/* data is read into this buffer */

    char *buf,			/* value passed to calling handler */

    int len,			/* value passed to calling handler */

    int skip,			/* number of bytes already read in previous

				   _XGetAsyncReply or _XGetAsyncData calls */

    int datalen,		/* size of data buffer in bytes */

    int discardtotal)		/* min. bytes to consume (after skip) */

{

    buf += skip;

    len -= skip;

    if (!data) {

	if (datalen > len)

	    _XEatData(dpy, datalen - len);

    } else if (datalen <= len) {

	memcpy(data, buf, datalen);

    } else {

	memcpy(data, buf, len);

	_XRead(dpy, data + len, datalen - len);

    }

    if (discardtotal > len) {

	if (datalen > len)

	    len = datalen;

	_XEatData(dpy, discardtotal - len);

    }

}