/* $XConsortium: XlibAsync.c,v 1.3 92/01/21 17:06:50 rws Exp $ */
/*

Copyright 1992 by the Massachusetts Institute of Technology

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, and that the name of M.I.T. not be used in advertising or
publicity pertaining to distribution of the software without specific,
written prior permission.  M.I.T. makes no representations about the
suitability of this software for any purpose.  It is provided "as is"
without express or implied warranty.

*/

#define NEED_REPLIES
#include <X11/Xlibint.h>
#include <X11/Xos.h>

/*ARGSUSED*/
Bool
_XAsyncErrorHandler(dpy, rep, buf, len, data)
    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) &&
	(!state->min_sequence_number ||
	 (state->min_sequence_number <= dpy->last_request_read)) &&
	(!state->max_sequence_number ||
	 (state->max_sequence_number >= dpy->last_request_read))) {
	state->last_error_received = rep->error.errorCode;
	state->error_count++;
	return True;
    }
    return False;
}

_XDeqAsyncHandler(dpy, handler)
    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(dpy, replbuf, rep, buf, len, extra, discard)
    register Display *dpy;
    register char *replbuf;
    register xReply *rep;
    char *buf;
    int len;
    int extra;
    Bool discard;
{
    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) {
	    bcopy(buf, replbuf, len);
	    _XRead(dpy, replbuf + len, size - len);
	    buf = replbuf;
	    len = size;
#ifdef MUSTCOPY
	} else {
	    bcopy(buf, replbuf, size);
	    buf = replbuf;
#endif
	}

	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;
}