cslibint.c

/*
 * cslibint.c -- low level I/O
 *
 * (c) Copyright 1993-1994 Adobe Systems Incorporated.
 * All rights reserved.
 * 
 * Permission to use, copy, modify, distribute, and sublicense this software
 * and its documentation for any purpose and without fee is hereby granted,
 * provided that the above copyright notices appear in all copies and that
 * both those copyright notices and this permission notice appear in
 * supporting documentation and that the name of Adobe Systems Incorporated
 * not be used in advertising or publicity pertaining to distribution of the
 * software without specific, written prior permission.  No trademark license
 * to use the Adobe trademarks is hereby granted.  If the Adobe trademark
 * "Display PostScript"(tm) is used to describe this software, its
 * functionality or for any other purpose, such use shall be limited to a
 * statement that this software works in conjunction with the Display
 * PostScript system.  Proper trademark attribution to reflect Adobe's
 * ownership of the trademark shall be given whenever any such reference to
 * the Display PostScript system is made.
 * 
 * ADOBE MAKES NO REPRESENTATIONS ABOUT THE SUITABILITY OF THE SOFTWARE FOR
 * ANY PURPOSE.  IT IS PROVIDED "AS IS" WITHOUT EXPRESS OR IMPLIED WARRANTY.
 * ADOBE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
 * IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NON- INFRINGEMENT OF THIRD PARTY RIGHTS.  IN NO EVENT SHALL ADOBE BE LIABLE
 * TO YOU OR ANY OTHER PARTY FOR ANY SPECIAL, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER WHETHER IN AN ACTION OF CONTRACT,
 * NEGLIGENCE, STRICT LIABILITY OR ANY OTHER ACTION ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.  ADOBE WILL NOT
 * PROVIDE ANY TRAINING OR OTHER SUPPORT FOR THE SOFTWARE.
 * 
 * Adobe, PostScript, and Display PostScript are trademarks of Adobe Systems
 * Incorporated which may be registered in certain jurisdictions
 * 
 * Portions Copyright 1985, 1986, 1987  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.
 *  
 * Author:  Adobe Systems Incorporated and MIT X Consortium
 */
/* $XFree86: xc/lib/dps/cslibint.c,v 1.4tsi Exp $ */

/*
 *	XlibInternal.c - Internal support routines for the C subroutine
 *	interface library (Xlib) to the X Window System Protocol V11.0.
 */
#define NEED_EVENTS
#define NEED_REPLIES

#include <X11/Xlibint.h>
#include <X11/Xos.h>
#include "Xlibnet.h"
#include <stdio.h>

#include "dpsassert.h"
#include "cslibint.h"

static void _EatData32 (Display *dpy, unsigned long n);

/* check for both EAGAIN and EWOULDBLOCK, because some supposedly POSIX
 * systems are broken and return EWOULDBLOCK when they should return EAGAIN
 */
#if defined(EAGAIN) && defined(EWOULDBLOCK)
#define ETEST(err) (err == EAGAIN || err == EWOULDBLOCK)
#else
#ifdef EAGAIN
#define ETEST(err) (err == EAGAIN)
#else
#define ETEST(err) (err == EWOULDBLOCK)
#endif
#endif

#ifdef LACHMAN
#ifdef EMSGSIZE
#undef EMSGSIZE
#endif
#define EMSGSIZE ERANGE
#endif

#if defined(SVR4) && defined(sun)
#define SUNSYSV 1
#endif

/*
 * The following routines are internal routines used by Xlib for protocol
 * packet transmission and reception.
 *
 * XIOError(Display *) will be called if any sort of system call error occurs.
 * This is assumed to be a fatal condition, i.e., XIOError should not return.
 *
 * XError(Display *, XErrorEvent *) will be called whenever an X_Error event is
 * received.  This is not assumed to be a fatal condition, i.e., it is
 * acceptable for this procedure to return.  However, XError should NOT
 * perform any operations (directly or indirectly) on the DISPLAY.
 *
 * Routines declared with a return type of 'Status' return 0 on failure,
 * and non 0 on success.  Routines with no declared return type don't 
 * return anything.  Whenever possible routines that create objects return
 * the object they have created.
 */

extern _XQEvent *_qfree;

static int padlength[4] = {0, 3, 2, 1};
    /* lookup table for adding padding bytes to data that is read from
    	or written to the X socket.  */

static xReq _dummy_request = {
	0, 0, 0
};
/*
 * N_XFlush - Flush the X request buffer.  If the buffer is empty, no
 * action is taken.  This routine correctly handles incremental writes.
 * This routine may have to be reworked if int < long.
 */
void N_XFlush (Display *dpy)
{
	register long size, todo;
	register int write_stat;
	register char *bufindex;
	
	if (!dpy) return;

	if (dpy->flags & XlibDisplayIOError) return;

	size = todo = dpy->bufptr - dpy->buffer;
	bufindex = dpy->bufptr = dpy->buffer;
	/*
	 * While write has not written the entire buffer, keep looping
	 * until the entire buffer is written.  bufindex will be incremented
	 * and size decremented as buffer is written out.
	 */
	while (size) {
	    errno = 0;
	    write_stat = WriteToServer(dpy->fd, bufindex, (int) todo);
	    if (write_stat >= 0) {
		size -= write_stat;
		todo = size;
		bufindex += write_stat;
	    } else if (ETEST(errno)) {
		N_XWaitForWritable(dpy);
#ifdef SUNSYSV
	    } else if (errno == 0) {
		N_XWaitForWritable(dpy);
#endif
#ifdef EMSGSIZE
	    } else if (errno == EMSGSIZE) {
		if (todo > 1) 
		  todo >>= 1;
		else
		  N_XWaitForWritable(dpy);
#endif
	    } else if (errno != EINTR) {
		/* Write failed! */
		/* errno set by write system call. */
		_XIOError(dpy);
	    }
	}
	dpy->last_req = (char *)&_dummy_request;
}

#ifdef NEEDFORNX

int
_XEventsQueued (Display *dpy, int mode)
{
	register int len;
	int pend;
	char buf[BUFSIZE];
	register xReply *rep;
	
	if (mode == QueuedAfterFlush)
	{
	    _XFlush(dpy);
	    if (dpy->qlen)
		return(dpy->qlen);
	}
	if (dpy->flags & XlibDisplayIOError) return(dpy->qlen);
	if (BytesReadable(dpy->fd, (char *) &pend) < 0)
	    _XIOError(dpy);
#ifdef XCONN_CHECK_FREQ
	/* This is a crock, required because FIONREAD or equivalent is
	 * not guaranteed to detect a broken connection.
	 */
	if (!pend && !dpy->qlen && ++dpy->conn_checker >= XCONN_CHECK_FREQ)
	{
	    unsigned long r_mask[MSKCNT];
	    static struct timeval zero_time;

	    dpy->conn_checker = 0;
	    CLEARBITS(r_mask);
	    BITSET(r_mask, dpy->fd);
	    if (pend = select(dpy->fd + 1, (int *)r_mask, NULL, NULL,
			      &zero_time))
	    {
		if (pend > 0)
		{
		    if (BytesReadable(dpy->fd, (char *) &pend) < 0)
			_XIOError(dpy);
		    /* we should not get zero, if we do, force a read */
		    if (!pend)
			pend = SIZEOF(xReply);
		}
		else if (pend < 0 && errno != EINTR)
		    _XIOError(dpy);
	    }
	}
#endif /* XCONN_CHECK_FREQ */
	if (!(len = pend))
	    return(dpy->qlen);	/* _XFlush can enqueue events */
      /* Force a read if there is not enough data.  Otherwise,
       * a select() loop at a higher-level will spin undesirably,
       * and we've seen at least one OS that appears to not update
       * the result from FIONREAD once it has returned nonzero.
       */
	if (len < SIZEOF(xReply))
	    len = SIZEOF(xReply);
	else if (len > BUFSIZE)
	    len = BUFSIZE;
	len /= SIZEOF(xReply);
	pend = len * SIZEOF(xReply);
#ifdef XCONN_CHECK_FREQ
	dpy->conn_checker = 0;
#endif
	_XRead (dpy, buf, (long) pend);

	/* no space between comma and type or else macro will die */
	STARTITERATE (rep,xReply, buf, (len > 0), len--) {
	    if (rep->generic.type == X_Error)
		_XError(dpy, (xError *)rep);
	    else   /* must be an event packet */
		_XEnq(dpy, (xEvent *) rep);
	}
	ENDITERATE
	return(dpy->qlen);
}

/* _XReadEvents - Flush the output queue,
 * then read as many events as possible (but at least 1) and enqueue them
 */
void _XReadEvents(Display *dpy)
{
	char buf[BUFSIZE];
	long pend_not_register; /* because can't "&" a register variable */
	register long pend;
	register xEvent *ev;
	Bool not_yet_flushed = True;

	do {
	    /* find out how much data can be read */
	    if (BytesReadable(dpy->fd, (char *) &pend_not_register) < 0)
	    	_XIOError(dpy);
	    pend = pend_not_register;

	    /* must read at least one xEvent; if none is pending, then
	       we'll just flush and block waiting for it */
	    if (pend < SIZEOF(xEvent)) {
	    	pend = SIZEOF(xEvent);
		/* don't flush until we block the first time */
		if (not_yet_flushed) {
		    int qlen = dpy->qlen;
		    _XFlush (dpy);
		    if (qlen != dpy->qlen) return;
		    not_yet_flushed = False;
		}
	    }
		
	    /* but we won't read more than the max buffer size */
	    if (pend > BUFSIZE)
	    	pend = BUFSIZE;

	    /* round down to an integral number of XReps */
	    pend = (pend / SIZEOF(xEvent)) * SIZEOF(xEvent);

	    _XRead (dpy, buf, pend);

	    /* no space between comma and type or else macro will die */
	    STARTITERATE (ev,xEvent, buf, (pend > 0),
			  pend -= SIZEOF(xEvent)) {
		if (ev->u.u.type == X_Error)
		    _XError (dpy, (xError *) ev);
		else  /* it's an event packet; enqueue it */
		    _XEnq (dpy, ev);
	    }
	    ENDITERATE
	} while (dpy->head == NULL);
}

#endif /* NEEDFORNX */

/* 
 * N_XRead - Read bytes from the socket taking into account incomplete
 * reads.  This routine may have to be reworked if int < long.
 */
int N_XRead (Display *dpy, char *data, long size)
{
	register long bytes_read;

        if (!dpy) return 0;
	if ((dpy->flags & XlibDisplayIOError) || size == 0) return 0;
	errno = 0;
	while ((bytes_read = ReadFromServer(dpy->fd, data, (int)size))
		!= size) {

	    	if (bytes_read > 0) {
		    size -= bytes_read;
		    data += bytes_read;
		    }
		else if (ETEST(errno)) {
		    N_XWaitForReadable(dpy);
		    errno = 0;
		}
#ifdef SUNSYSV
		else if (errno == 0) {
		    N_XWaitForReadable(dpy);
		}
#endif
		else if (bytes_read == 0) {
		    /* Read failed because of end of file! */
		    errno = EPIPE;
		    _XIOError(dpy);
		    }

		else  /* bytes_read is less than 0; presumably -1 */ {
		    /* If it's a system call interrupt, it's not an error. */
		    if (errno != EINTR)
		    	_XIOError(dpy);
		    }
	    	 }
	return 0;
}

#ifdef WORD64

/*
 * XXX This is a *really* stupid way of doing this....
 * PACKBUFFERSIZE must be a multiple of 4.
 */

#define PACKBUFFERSIZE 4096


/*
 * _XRead32 - Read bytes from the socket unpacking each 32 bits
 *            into a long (64 bits on a CRAY computer).
 * 
 */
static void _doXRead32 (Display *dpy, long *data, long size, char *packbuffer)
{
 long *lpack,*lp;
 long mask32 = 0x00000000ffffffff;
 long maskw, nwords, i, bits;

        _XReadPad (dpy, packbuffer, size);

        lp = data;
        lpack = (long *) packbuffer;
        nwords = size >> 2;
        bits = 32;

        for(i=0;i<nwords;i++){
            maskw = mask32 << bits;
           *lp++ = ( *lpack & maskw ) >> bits;
            bits = bits ^32;
            if(bits){
               lpack++;
            }
        }
}

void _XRead32 (Display *dpy, long *data, long len)
{
    char packbuffer[PACKBUFFERSIZE];
    unsigned nunits = PACKBUFFERSIZE >> 2;

    for (; len > PACKBUFFERSIZE; len -= PACKBUFFERSIZE, data += nunits) {
	_doXRead32 (dpy, data, PACKBUFFERSIZE, packbuffer);
    }
    if (len) _doXRead32 (dpy, data, len, packbuffer);
}



/*
 * _XRead16 - Read bytes from the socket unpacking each 16 bits
 *            into a long (64 bits on a CRAY computer).
 *
 */
static void _doXRead16 (Display *dpy, short *data, long size, char *packbuffer)
{
	long *lpack,*lp;
	long mask16 = 0x000000000000ffff;
	long maskw, nwords, i, bits;

        _XRead(dpy,packbuffer,size);	/* don't do a padded read... */

        lp = (long *) data;
        lpack = (long *) packbuffer;
        nwords = size >> 1;  /* number of 16 bit words to be unpacked */
        bits = 48;
        for(i=0;i<nwords;i++){
            maskw = mask16 << bits;
           *lp++ = ( *lpack & maskw ) >> bits;
            bits -= 16;
            if(bits < 0){
               lpack++;
               bits = 48;
            }
        }
}

void _XRead16 (Display *dpy, short *data, long len)
{
    char packbuffer[PACKBUFFERSIZE];
    unsigned nunits = PACKBUFFERSIZE >> 1;

    for (; len > PACKBUFFERSIZE; len -= PACKBUFFERSIZE, data += nunits) {
	_doXRead16 (dpy, data, PACKBUFFERSIZE, packbuffer);
    }
    if (len) _doXRead16 (dpy, data, len, packbuffer);
}

void _XRead16Pad (Display *dpy, short *data, long size)
{
    int slop = (size & 3);
    short slopbuf[3];

    _XRead16 (dpy, data, size);
    if (slop > 0) {
	_XRead16 (dpy, slopbuf, 4 - slop);
    }
}
#endif /* WORD64 */


/*
 * N_XReadPad - Read bytes from the socket taking into account incomplete
 * reads.  If the number of bytes is not 0 mod 32, read additional pad
 * bytes. This routine may have to be reworked if int < long.
 */
void N_XReadPad (Display *dpy, char *data, long size)
{
    	register long bytes_read;
	struct iovec iov[2];
	char pad[3];

        if (!dpy) return;
	if ((dpy->flags & XlibDisplayIOError) || size == 0) return;
	iov[0].iov_len = (int)size;
	iov[0].iov_base = data;
	/* 
	 * The following hack is used to provide 32 bit long-word
	 * aligned padding.  The [1] vector is of length 0, 1, 2, or 3,
	 * whatever is needed.
	 */

	iov[1].iov_len = padlength[size & 3];
	iov[1].iov_base = pad;
	size += iov[1].iov_len;
	errno = 0;
	while ((bytes_read = ReadvFromServer (dpy->fd, iov, 2)) != size) {

	    if (bytes_read > 0) {
		size -= bytes_read;
		if (iov[0].iov_len < bytes_read) {
		    iov[1].iov_len += iov[0].iov_len - bytes_read;
		    iov[1].iov_base =
			(char *)iov[1].iov_base + bytes_read - iov[0].iov_len;
		    iov[0].iov_len = 0;
		}
	    	else {
		    iov[0].iov_len -= bytes_read;
	    	    iov[0].iov_base = (char *)iov[0].iov_base + bytes_read;
	    	}
	    }
	    else if (ETEST(errno)) {
		N_XWaitForReadable(dpy);
		errno = 0;
	    }
#ifdef SUNSYSV
	    else if (errno == 0) {
		N_XWaitForReadable(dpy);
	    }
#endif
	    else if (bytes_read == 0) {
		/* Read failed because of end of file! */
		errno = EPIPE;
		_XIOError(dpy);
		}
	    
	    else  /* bytes_read is less than 0; presumably -1 */ {
		/* If it's a system call interrupt, it's not an error. */
		if (errno != EINTR)
		    _XIOError(dpy);
		}
	    }
}

/*
 * N_XSend - Flush the buffer and send the client data. 32 bit word aligned
 * transmission is used, if size is not 0 mod 4, extra bytes are transmitted.
 * This routine may have to be reworked if int < long;
 */
void N_XSend (Display *dpy, _Xconst char *data, long size)
{
	struct iovec iov[3];
	static char pad[3] = {0, 0, 0};
           /* XText8 and XText16 require that the padding bytes be zero! */

	long skip = 0;
	long dpybufsize = (dpy->bufptr - dpy->buffer);
	long padsize = padlength[size & 3];
	long total = dpybufsize + size + padsize;
	long todo = total;

	if (dpy->flags & XlibDisplayIOError) return;

	/*
	 * There are 3 pieces that may need to be written out:
	 *
	 *     o  whatever is in the display buffer
	 *     o  the data passed in by the user
	 *     o  any padding needed to 32bit align the whole mess
	 *
	 * This loop looks at all 3 pieces each time through.  It uses skip
	 * to figure out whether or not a given piece is needed.
	 */
	while (total) {
	    long before = skip;		/* amount of whole thing written */
	    long remain = todo;		/* amount to try this time, <= total */
	    int i = 0;
	    long len;

	    /* You could be very general here and have "in" and "out" iovecs
	     * and write a loop without using a macro, but what the heck.  This
	     * translates to:
	     *
	     *     how much of this piece is new?
	     *     if more new then we are trying this time, clamp
	     *     if nothing new
	     *         then bump down amount already written, for next piece
	     *         else put new stuff in iovec, will need all of next piece
	     *
	     * Note that todo had better be at least 1 or else we'll end up
	     * writing 0 iovecs.
	     */
#define InsertIOV(pointer, length) \
	    len = (length) - before; \
	    if (len > remain) \
		len = remain; \
	    if (len <= 0) { \
		before = (-len); \
	    } else { \
		iov[i].iov_len = len; \
		iov[i].iov_base = (pointer) + before; \
		i++; \
		remain -= len; \
		before = 0; \
	    }

	    InsertIOV (dpy->buffer, dpybufsize)
	    InsertIOV ((char *)data, size)
	    InsertIOV (pad, padsize)
    
	    errno = 0;
	    if ((len = WritevToServer(dpy->fd, iov, i)) >= 0) {
		skip += len;
		total -= len;
		todo = total;
	    } else if (ETEST(errno)) {
		N_XWaitForWritable(dpy);
#ifdef SUNSYSV
	    } else if (errno == 0) {
		N_XWaitForWritable(dpy);
#endif
#ifdef EMSGSIZE
	    } else if (errno == EMSGSIZE) {
		if (todo > 1) 
		  todo >>= 1;
		else 
		  N_XWaitForWritable(dpy);
#endif
	    } else if (errno != EINTR) {
		_XIOError(dpy);
	    }
	}

	dpy->bufptr = dpy->buffer;
	dpy->last_req = (char *) & _dummy_request;
	return;
}

#ifdef NEEDFORNX
/*
 * _XAllocID - normal resource ID allocation routine.  A client
 * can roll his own and instatantiate it if he wants, but must
 * follow the rules.
 */
XID _XAllocID(Display *dpy)
{
   XID id;

   id = dpy->resource_id << dpy->resource_shift;
   if (id <= dpy->resource_mask) {
       dpy->resource_id++;
       return (dpy->resource_base + id);
   }
   if (id != 0x10000000) {
       (void) fprintf(stderr,
		      "Xlib: resource ID allocation space exhausted!\n");
       id = 0x10000000;
       dpy->resource_id = id >> dpy->resource_shift;
   }
   return id;
}

/*
 * The hard part about this is that we only get 16 bits from a reply.  Well,
 * then, we have three values that will march along, with the following
 * invariant:
 *	dpy->last_request_read <= rep->sequenceNumber <= dpy->request
 * The right choice for rep->sequenceNumber is the largest that
 * still meets these constraints.
 */

unsigned long
_XSetLastRequestRead(Display *dpy, xGenericReply *rep)
{
    register unsigned long	newseq, lastseq;

    /*
     * KeymapNotify has no sequence number, but is always guaranteed
     * to immediately follow another event, except when generated via
     * SendEvent (hmmm).
     */
    if ((rep->type & 0x7f) == KeymapNotify)
	return(dpy->last_request_read);

    newseq = (dpy->last_request_read & ~((unsigned long)0xffff)) |
	     rep->sequenceNumber;
    lastseq = dpy->last_request_read;
    while (newseq < lastseq) {
	newseq += 0x10000;
	if (newseq > dpy->request) {
	    (void) fprintf (stderr, 
	    "Xlib:  sequence lost (0x%lx > 0x%lx) in reply type 0x%x!\n",
	                           newseq, dpy->request, 
				   (unsigned int) rep->type);
	    newseq -= 0x10000;
	    break;
	}
    }

    dpy->last_request_read = newseq;
    return(newseq);
}

#endif /* NEEDFORNX */

/*
 * N_XReply - Wait for a reply packet and copy its contents into the
 * specified rep.  Mean while we must handle error and event packets that
 * we may encounter.
 */
Status N_XReply (
    Display *dpy,
    xReply *rep,
    int extra,		/* number of 32-bit words expected after the reply */
    Bool discard)	/* should I discard data following "extra" words? */
{
    /* Pull out the serial number now, so that (currently illegal) requests
     * generated by an error handler don't confuse us.
     */
    unsigned long cur_request = dpy->request;

    if (dpy->flags & XlibDisplayIOError) return (0);

    N_XFlush(dpy);
    while (1) {
	N_XRead(dpy, (char *)rep, (long)SIZEOF(xReply));
	switch ((int)rep->generic.type) {

	    case X_Reply:
	        /* Reply received.  Fast update for synchronous replies,
		 * but deal with multiple outstanding replies.
		 */
	        if (rep->generic.sequenceNumber == (cur_request & 0xffff))
		    dpy->last_request_read = cur_request;
		else
		    (void) _XSetLastRequestRead(dpy, &rep->generic);
		if (extra == 0) {
		    if (discard && (rep->generic.length > 0))
		       /* unexpectedly long reply! */
		       _EatData32 (dpy, rep->generic.length);
		    return (1);
		    }
		if ((unsigned) extra == rep->generic.length) {
		    /* 
		     * Read the extra data into storage immediately following
		     * the GenericReply structure. 
		     */
		    N_XRead (dpy, (char *) (NEXTPTR(rep,xReply)),
			    ((long)extra) << 2);
		    return (1);
		    }
		if ((unsigned) extra < rep->generic.length) {
		    /* Actual reply is longer than "extra" */
		    N_XRead (dpy, (char *) (NEXTPTR(rep,xReply)),
			    ((long)extra) << 2);
		    if (discard)
		        _EatData32 (dpy, rep->generic.length - extra);
		    return (1);
		    }
		/* 
		 *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...
		 */
		N_XRead (dpy, (char *) (NEXTPTR(rep,xReply)),
			((long) rep->generic.length) << 2);
		_XIOError (dpy);
		return (0);

    	    case X_Error:
	    	{
	        register _XExtension *ext;
		register Bool ret = False;
		int ret_code;
		xError *err = (xError *) rep;
		unsigned long serial;

		serial = _XSetLastRequestRead(dpy, (xGenericReply *)rep);
		/* 
		 * we better see if there is an extension who may
		 * want to suppress the error.
		 */
		for (ext = dpy->ext_procs; !ret && ext; ext = ext->next) {
		    if (ext->error) 
		       ret = (*ext->error)(dpy, err, &ext->codes, &ret_code);
		}
		if (!ret) {
		    _XError(dpy, err);
		    ret_code = 0;
		}
		if (serial == cur_request)
		    return(ret_code);
		}
		break;
	    default:
		/* There should never be any events on this connection! */
		DPSFatalProc(NULL, "N_XReply read bogus X event");
		break;
	    }
	}
}   


/* Read and discard "n" 8-bit bytes of data */

static void
N_XEatData (Display *dpy, unsigned long n)
{
#define SCRATCHSIZE 2048
    char buf[SCRATCHSIZE];

    while (n > 0) {
	register long bytes_read = (n > SCRATCHSIZE) ? SCRATCHSIZE : n;
	N_XRead (dpy, buf, bytes_read);
	n -= bytes_read;
    }
#undef SCRATCHSIZE
}


/* Read and discard "n" 32-bit words. */

static void _EatData32 (Display *dpy, unsigned long n)
{
    N_XEatData (dpy, n << 2);
}


#ifdef NEEDFORNX
/*
 * _XEnq - Place event packets on the display's queue.
 * note that no squishing of move events in V11, since there
 * is pointer motion hints....
 */
void _XEnq (Display *dpy, xEvent *event)
{
	register _XQEvent *qelt;

/*NOSTRICT*/
	if (qelt = _qfree) {
		/* If _qfree is non-NULL do this, else malloc a new one. */
		_qfree = qelt->next;
	}
	else if ((qelt = 
	    (_XQEvent *) Xmalloc((unsigned)sizeof(_XQEvent))) == NULL) {
		/* Malloc call failed! */
		errno = ENOMEM;
		_XIOError(dpy);
	}
	qelt->next = NULL;
	/* go call through display to find proper event reformatter */
	if ((*dpy->event_vec[event->u.u.type & 0177])(dpy, &qelt->event, event)) {
	    if (dpy->tail)	dpy->tail->next = qelt;
	    else 		dpy->head = qelt;
    
	    dpy->tail = qelt;
	    dpy->qlen++;
	} else {
	    /* ignored, or stashed away for many-to-one compression */
	    qelt->next = _qfree;
	    _qfree = qelt;
	}
}
/*
 * EventToWire in separate file in that often not needed.
 */
#endif /* NEEDFORNX */

/*ARGSUSED*/
Bool
N_XUnknownWireEvent(
	Display *dpy,	/* pointer to display structure */
	XEvent *re,	/* pointer to where event should be reformatted */
	xEvent *event)	/* wire protocol event */
{
        char mbuf[256];
	
	sprintf(mbuf, "NX: unhandled wire event %d, agent = %lx", re->type, (long)dpy);
	DPSWarnProc(NULL, mbuf);
	return(False);
}

/*ARGSUSED*/
Status
N_XUnknownNativeEvent(
	Display *dpy,	/* pointer to display structure */
	XEvent *re,	/* pointer to where event should be reformatted */
	xEvent *event)	/* wire protocol event */
{
        char mbuf[256];
	
	sprintf(mbuf, "NX: unhandled native event %d, agent = %lx", re->type, (long)dpy);
	DPSWarnProc(NULL, mbuf);
	return(0);
}

#ifdef NEEDFORNX
/*
 * reformat a wire event into an XEvent structure of the right type.
 */
Bool
_XWireToEvent(
	Display *dpy,	/* pointer to display structure */
	XEvent *re,	/* pointer to where event should be reformatted */
	xEvent *event)	/* wire protocol event */
{

	re->type = event->u.u.type & 0x7f;
	((XAnyEvent *)re)->serial = _XSetLastRequestRead(dpy,
					(xGenericReply *)event);
	((XAnyEvent *)re)->send_event = ((event->u.u.type & 0x80) != 0);
	((XAnyEvent *)re)->display = dpy;
	
	/* Ignore the leading bit of the event type since it is set when a
		client sends an event rather than the server. */

	switch (event-> u.u.type & 0177) {
	      case KeyPress:
	      case KeyRelease:
	        {
			register XKeyEvent *ev = (XKeyEvent*) re;
			ev->root 	= event->u.keyButtonPointer.root;
			ev->window 	= event->u.keyButtonPointer.event;
			ev->subwindow 	= event->u.keyButtonPointer.child;
			ev->time 	= event->u.keyButtonPointer.time;
			ev->x 		= cvtINT16toInt(event->u.keyButtonPointer.eventX);
			ev->y 		= cvtINT16toInt(event->u.keyButtonPointer.eventY);
			ev->x_root 	= cvtINT16toInt(event->u.keyButtonPointer.rootX);
			ev->y_root 	= cvtINT16toInt(event->u.keyButtonPointer.rootY);
			ev->state	= event->u.keyButtonPointer.state;
			ev->same_screen	= event->u.keyButtonPointer.sameScreen;
			ev->keycode 	= event->u.u.detail;
		}
	      	break;
	      case ButtonPress:
	      case ButtonRelease:
	        {
			register XButtonEvent *ev =  (XButtonEvent *) re;
			ev->root 	= event->u.keyButtonPointer.root;
			ev->window 	= event->u.keyButtonPointer.event;
			ev->subwindow 	= event->u.keyButtonPointer.child;
			ev->time 	= event->u.keyButtonPointer.time;
			ev->x 		= cvtINT16toInt(event->u.keyButtonPointer.eventX);
			ev->y 		= cvtINT16toInt(event->u.keyButtonPointer.eventY);
			ev->x_root 	= cvtINT16toInt(event->u.keyButtonPointer.rootX);
			ev->y_root 	= cvtINT16toInt(event->u.keyButtonPointer.rootY);
			ev->state	= event->u.keyButtonPointer.state;
			ev->same_screen	= event->u.keyButtonPointer.sameScreen;
			ev->button 	= event->u.u.detail;
		}
	        break;
	      case MotionNotify:
	        {
			register XMotionEvent *ev =   (XMotionEvent *)re;
			ev->root 	= event->u.keyButtonPointer.root;
			ev->window 	= event->u.keyButtonPointer.event;
			ev->subwindow 	= event->u.keyButtonPointer.child;
			ev->time 	= event->u.keyButtonPointer.time;
			ev->x 		= cvtINT16toInt(event->u.keyButtonPointer.eventX);
			ev->y 		= cvtINT16toInt(event->u.keyButtonPointer.eventY);
			ev->x_root 	= cvtINT16toInt(event->u.keyButtonPointer.rootX);
			ev->y_root 	= cvtINT16toInt(event->u.keyButtonPointer.rootY);
			ev->state	= event->u.keyButtonPointer.state;
			ev->same_screen	= event->u.keyButtonPointer.sameScreen;
			ev->is_hint 	= event->u.u.detail;
		}
	        break;
	      case EnterNotify:
	      case LeaveNotify:
		{
			register XCrossingEvent *ev   = (XCrossingEvent *) re;
			ev->root	= event->u.enterLeave.root;
			ev->window	= event->u.enterLeave.event;
			ev->subwindow	= event->u.enterLeave.child;
			ev->time	= event->u.enterLeave.time;
			ev->x		= cvtINT16toInt(event->u.enterLeave.eventX);
			ev->y		= cvtINT16toInt(event->u.enterLeave.eventY);
			ev->x_root	= cvtINT16toInt(event->u.enterLeave.rootX);
			ev->y_root	= cvtINT16toInt(event->u.enterLeave.rootY);
			ev->state	= event->u.enterLeave.state;
			ev->mode	= event->u.enterLeave.mode;
			ev->same_screen = (event->u.enterLeave.flags & 
				ELFlagSameScreen) && True;
			ev->focus	= (event->u.enterLeave.flags &
			  	ELFlagFocus) && True;
			ev->detail	= event->u.u.detail;
		}
		  break;
	      case FocusIn:
	      case FocusOut:
		{
			register XFocusChangeEvent *ev = (XFocusChangeEvent *) re;
			ev->window 	= event->u.focus.window;
			ev->mode	= event->u.focus.mode;
			ev->detail	= event->u.u.detail;
		}
		  break;
	      case KeymapNotify:
		{
			register XKeymapEvent *ev = (XKeymapEvent *) re;
			ev->window	= dpy->current;
			bcopy ((char *)((xKeymapEvent *) event)->map,
			       &ev->key_vector[1], 
			       sizeof (((xKeymapEvent *) event)->map));
		}
		break;
	      case Expose:
		{
			register XExposeEvent *ev = (XExposeEvent *) re;
			ev->window	= event->u.expose.window;
			ev->x		= event->u.expose.x;
			ev->y		= event->u.expose.y;
			ev->width	= event->u.expose.width;
			ev->height	= event->u.expose.height;
			ev->count	= event->u.expose.count;
		}
		break;
	      case GraphicsExpose:
		{
		    register XGraphicsExposeEvent *ev =
			(XGraphicsExposeEvent *) re;
		    ev->drawable	= event->u.graphicsExposure.drawable;
		    ev->x		= event->u.graphicsExposure.x;
		    ev->y		= event->u.graphicsExposure.y;
		    ev->width		= event->u.graphicsExposure.width;
		    ev->height		= event->u.graphicsExposure.height;
		    ev->count		= event->u.graphicsExposure.count;
		    ev->major_code	= event->u.graphicsExposure.majorEvent;
		    ev->minor_code	= event->u.graphicsExposure.minorEvent;
		}
		break;
	      case NoExpose:
		{
		    register XNoExposeEvent *ev = (XNoExposeEvent *) re;
		    ev->drawable	= event->u.noExposure.drawable;
		    ev->major_code	= event->u.noExposure.majorEvent;
		    ev->minor_code	= event->u.noExposure.minorEvent;
		}
		break;
	      case VisibilityNotify:
		{
		    register XVisibilityEvent *ev = (XVisibilityEvent *) re;
		    ev->window		= event->u.visibility.window;
		    ev->state		= event->u.visibility.state;
		}
		break;
	      case CreateNotify:
		{
		    register XCreateWindowEvent *ev =
			 (XCreateWindowEvent *) re;
		    ev->window		= event->u.createNotify.window;
		    ev->parent		= event->u.createNotify.parent;
		    ev->x		= cvtINT16toInt(event->u.createNotify.x);
		    ev->y		= cvtINT16toInt(event->u.createNotify.y);
		    ev->width		= event->u.createNotify.width;
		    ev->height		= event->u.createNotify.height;
		    ev->border_width	= event->u.createNotify.borderWidth;
		    ev->override_redirect	= event->u.createNotify.override;
		}
		break;
	      case DestroyNotify:
		{
		    register XDestroyWindowEvent *ev =
				(XDestroyWindowEvent *) re;
		    ev->window		= event->u.destroyNotify.window;
		    ev->event		= event->u.destroyNotify.event;
		}
		break;
	      case UnmapNotify:
		{
		    register XUnmapEvent *ev = (XUnmapEvent *) re;
		    ev->window		= event->u.unmapNotify.window;
		    ev->event		= event->u.unmapNotify.event;
		    ev->from_configure	= event->u.unmapNotify.fromConfigure;
		}
		break;
	      case MapNotify:
		{
		    register XMapEvent *ev = (XMapEvent *) re;
		    ev->window		= event->u.mapNotify.window;
		    ev->event		= event->u.mapNotify.event;
		    ev->override_redirect	= event->u.mapNotify.override;
		}
		break;
	      case MapRequest:
		{
		    register XMapRequestEvent *ev = (XMapRequestEvent *) re;
		    ev->window		= event->u.mapRequest.window;
		    ev->parent		= event->u.mapRequest.parent;
		}
		break;
	      case ReparentNotify:
		{
		    register XReparentEvent *ev = (XReparentEvent *) re;
		    ev->event		= event->u.reparent.event;
		    ev->window		= event->u.reparent.window;
		    ev->parent		= event->u.reparent.parent;
		    ev->x		= cvtINT16toInt(event->u.reparent.x);
		    ev->y		= cvtINT16toInt(event->u.reparent.y);
		    ev->override_redirect	= event->u.reparent.override;
		}
		break;
	      case ConfigureNotify:
		{
		    register XConfigureEvent *ev = (XConfigureEvent *) re;
		    ev->event	= event->u.configureNotify.event;
		    ev->window	= event->u.configureNotify.window;
		    ev->above	= event->u.configureNotify.aboveSibling;
		    ev->x	= cvtINT16toInt(event->u.configureNotify.x);
		    ev->y	= cvtINT16toInt(event->u.configureNotify.y);
		    ev->width	= event->u.configureNotify.width;
		    ev->height	= event->u.configureNotify.height;
		    ev->border_width  = event->u.configureNotify.borderWidth;
		    ev->override_redirect = event->u.configureNotify.override;
		}
		break;
	      case ConfigureRequest:
		{
		    register XConfigureRequestEvent *ev =
		        (XConfigureRequestEvent *) re;
		    ev->window		= event->u.configureRequest.window;
		    ev->parent		= event->u.configureRequest.parent;
		    ev->above		= event->u.configureRequest.sibling;
		    ev->x		= cvtINT16toInt(event->u.configureRequest.x);
		    ev->y		= cvtINT16toInt(event->u.configureRequest.y);
		    ev->width		= event->u.configureRequest.width;
		    ev->height		= event->u.configureRequest.height;
		    ev->border_width	= event->u.configureRequest.borderWidth;
		    ev->value_mask	= event->u.configureRequest.valueMask;
		    ev->detail  	= event->u.u.detail;
		}
		break;
	      case GravityNotify:
		{
		    register XGravityEvent *ev = (XGravityEvent *) re;
		    ev->window		= event->u.gravity.window;
		    ev->event		= event->u.gravity.event;
		    ev->x		= cvtINT16toInt(event->u.gravity.x);
		    ev->y		= cvtINT16toInt(event->u.gravity.y);
		}
		break;
	      case ResizeRequest:
		{
		    register XResizeRequestEvent *ev =
			(XResizeRequestEvent *) re;
		    ev->window		= event->u.resizeRequest.window;
		    ev->width		= event->u.resizeRequest.width;
		    ev->height		= event->u.resizeRequest.height;
		}
		break;
	      case CirculateNotify:
		{
		    register XCirculateEvent *ev = (XCirculateEvent *) re;
		    ev->window		= event->u.circulate.window;
		    ev->event		= event->u.circulate.event;
		    ev->place		= event->u.circulate.place;
		}
		break;
	      case CirculateRequest:
		{
		    register XCirculateRequestEvent *ev =
		        (XCirculateRequestEvent *) re;
		    ev->window		= event->u.circulate.window;
		    ev->parent		= event->u.circulate.event;
		    ev->place		= event->u.circulate.place;
		}
		break;
	      case PropertyNotify:
		{
		    register XPropertyEvent *ev = (XPropertyEvent *) re;
		    ev->window		= event->u.property.window;
		    ev->atom		= event->u.property.atom;
		    ev->time		= event->u.property.time;
		    ev->state		= event->u.property.state;
		}
		break;
	      case SelectionClear:
		{
		    register XSelectionClearEvent *ev =
			 (XSelectionClearEvent *) re;
		    ev->window		= event->u.selectionClear.window;
		    ev->selection	= event->u.selectionClear.atom;
		    ev->time		= event->u.selectionClear.time;
		}
		break;
	      case SelectionRequest:
		{
		    register XSelectionRequestEvent *ev =
		        (XSelectionRequestEvent *) re;
		    ev->owner		= event->u.selectionRequest.owner;
		    ev->requestor	= event->u.selectionRequest.requestor;
		    ev->selection	= event->u.selectionRequest.selection;
		    ev->target		= event->u.selectionRequest.target;
		    ev->property	= event->u.selectionRequest.property;
		    ev->time		= event->u.selectionRequest.time;
		}
		break;
	      case SelectionNotify:
		{
		    register XSelectionEvent *ev = (XSelectionEvent *) re;
		    ev->requestor	= event->u.selectionNotify.requestor;
		    ev->selection	= event->u.selectionNotify.selection;
		    ev->target		= event->u.selectionNotify.target;
		    ev->property	= event->u.selectionNotify.property;
		    ev->time		= event->u.selectionNotify.time;
		}
		break;
	      case ColormapNotify:
		{
		    register XColormapEvent *ev = (XColormapEvent *) re;
		    ev->window		= event->u.colormap.window;
		    ev->colormap	= event->u.colormap.colormap;
		    ev->new		= event->u.colormap.new;
		    ev->state		= event->u.colormap.state;
	        }
		break;
	      case ClientMessage:
		{
		   register int i;
		   register XClientMessageEvent *ev 
		   			= (XClientMessageEvent *) re;
		   ev->window		= event->u.clientMessage.window;
		   ev->format		= event->u.u.detail;
		   switch (ev->format) {
			case 8:	
			   ev->message_type = event->u.clientMessage.u.b.type;
			   for (i = 0; i < 20; i++) 	
			     ev->data.b[i] = event->u.clientMessage.u.b.bytes[i];
			   break;
			case 16:
			   ev->message_type = event->u.clientMessage.u.s.type;
			   ev->data.s[0] = cvtINT16toShort(event->u.clientMessage.u.s.shorts0);
			   ev->data.s[1] = cvtINT16toShort(event->u.clientMessage.u.s.shorts1);
			   ev->data.s[2] = cvtINT16toShort(event->u.clientMessage.u.s.shorts2);
			   ev->data.s[3] = cvtINT16toShort(event->u.clientMessage.u.s.shorts3);
			   ev->data.s[4] = cvtINT16toShort(event->u.clientMessage.u.s.shorts4);
			   ev->data.s[5] = cvtINT16toShort(event->u.clientMessage.u.s.shorts5);
			   ev->data.s[6] = cvtINT16toShort(event->u.clientMessage.u.s.shorts6);
			   ev->data.s[7] = cvtINT16toShort(event->u.clientMessage.u.s.shorts7);
			   ev->data.s[8] = cvtINT16toShort(event->u.clientMessage.u.s.shorts8);
			   ev->data.s[9] = cvtINT16toShort(event->u.clientMessage.u.s.shorts9);
			   break;
			case 32:
			   ev->message_type = event->u.clientMessage.u.l.type;
			   ev->data.l[0] = cvtINT32toLong(event->u.clientMessage.u.l.longs0);
			   ev->data.l[1] = cvtINT32toLong(event->u.clientMessage.u.l.longs1);
			   ev->data.l[2] = cvtINT32toLong(event->u.clientMessage.u.l.longs2);
			   ev->data.l[3] = cvtINT32toLong(event->u.clientMessage.u.l.longs3);
			   ev->data.l[4] = cvtINT32toLong(event->u.clientMessage.u.l.longs4);
			   break;
			default: /* XXX should never occur */
				break;
		    }
	        }
		break;
	      case MappingNotify:
		{
		   register XMappingEvent *ev = (XMappingEvent *)re;
		   ev->window		= 0;
		   ev->first_keycode 	= event->u.mappingNotify.firstKeyCode;
		   ev->request 		= event->u.mappingNotify.request;
		   ev->count 		= event->u.mappingNotify.count;
		}
		break;
	      default:
		return(_XUnknownWireEvent(dpy, re, event));
	}
	return(True);
}


#ifndef USL_SHARELIB

static char *_SysErrorMsg (int n)
{
    extern char *sys_errlist[];
    extern int sys_nerr;
    char *s = ((n >= 0 && n < sys_nerr) ? sys_errlist[n] : "unknown error");

    return (s ? s : "no such error");
}

#endif 	/* USL sharedlibs in don't define for SVR3.2 */


/*
 * _XDefaultIOError - Default fatal system error reporting routine.  Called 
 * when an X internal system error is encountered.
 */
_XDefaultIOError (Display *dpy)
{
	(void) fprintf (stderr, 
	 "XIO:  fatal IO error %d (%s) on X server \"%s\"\r\n",
			errno, _SysErrorMsg (errno), DisplayString (dpy));
	(void) fprintf (stderr, 
	 "      after %lu requests (%lu known processed) with %d events remaining.\r\n",
			NextRequest(dpy) - 1, LastKnownRequestProcessed(dpy),
			QLength(dpy));

	if (errno == EPIPE) {
	    (void) fprintf (stderr,
	 "      The connection was probably broken by a server shutdown or KillClient.\r\n");
	}
	exit(1);
}


static int _XPrintDefaultError (Display *dpy, XErrorEvent *event, FILE *fp)
{
    char buffer[BUFSIZ];
    char mesg[BUFSIZ];
    char number[32];
    char *mtype = "XlibMessage";
    register _XExtension *ext = (_XExtension *)NULL;
    _XExtension *bext = (_XExtension *)NULL;
    XGetErrorText(dpy, event->error_code, buffer, BUFSIZ);
    XGetErrorDatabaseText(dpy, mtype, "XError", "X Error", mesg, BUFSIZ);
    (void) fprintf(fp, "%s:  %s\n  ", mesg, buffer);
    XGetErrorDatabaseText(dpy, mtype, "MajorCode", "Request Major code %d", 
	mesg, BUFSIZ);
    (void) fprintf(fp, mesg, event->request_code);
    if (event->request_code < 128) {
	sprintf(number, "%d", event->request_code);
	XGetErrorDatabaseText(dpy, "XRequest", number, "", buffer, BUFSIZ);
    } else {
	for (ext = dpy->ext_procs;
	     ext && (ext->codes.major_opcode != event->request_code);
	     ext = ext->next)
	  ;
	if (ext)
	    strcpy(buffer, ext->name);
	else
	    buffer[0] = '\0';
    }
    (void) fprintf(fp, " (%s)\n", buffer);
    if (event->request_code >= 128) {
	XGetErrorDatabaseText(dpy, mtype, "MinorCode", "Request Minor code %d",
			      mesg, BUFSIZ);
	fputs("  ", fp);
	(void) fprintf(fp, mesg, event->minor_code);
	if (ext) {
	    sprintf(mesg, "%s.%d", ext->name, event->minor_code);
	    XGetErrorDatabaseText(dpy, "XRequest", mesg, "", buffer, BUFSIZ);
	    (void) fprintf(fp, " (%s)", buffer);
	}
	fputs("\n", fp);
    }
    if (event->error_code >= 128) {
	/* kludge, try to find the extension that caused it */
	buffer[0] = '\0';
	for (ext = dpy->ext_procs; ext; ext = ext->next) {
	    if (ext->error_string) 
		(*ext->error_string)(dpy, event->error_code, &ext->codes,
				     buffer, BUFSIZ);
	    if (buffer[0]) {
		bext = ext;
		break;
	    }
	    if (ext->codes.first_error &&
		ext->codes.first_error < event->error_code &&
		(!bext || ext->codes.first_error > bext->codes.first_error))
		bext = ext;
	}    
	if (bext)
	    sprintf(buffer, "%s.%d", bext->name,
		    event->error_code - bext->codes.first_error);
	else
	    strcpy(buffer, "Value");
	XGetErrorDatabaseText(dpy, mtype, buffer, "", mesg, BUFSIZ);
	if (mesg[0]) {
	    fputs("  ", fp);
	    (void) fprintf(fp, mesg, event->resourceid);
	    fputs("\n", fp);
	}
	/* let extensions try to print the values */
	for (ext = dpy->ext_procs; ext; ext = ext->next) {
	    if (ext->error_values)
		(*ext->error_values)(dpy, event, fp);
	}
    } else if ((event->error_code == BadWindow) ||
	       (event->error_code == BadPixmap) ||
	       (event->error_code == BadCursor) ||
	       (event->error_code == BadFont) ||
	       (event->error_code == BadDrawable) ||
	       (event->error_code == BadColor) ||
	       (event->error_code == BadGC) ||
	       (event->error_code == BadIDChoice) ||
	       (event->error_code == BadValue) ||
	       (event->error_code == BadAtom)) {
	if (event->error_code == BadValue)
	    XGetErrorDatabaseText(dpy, mtype, "Value", "Value 0x%x",
				  mesg, BUFSIZ);
	else if (event->error_code == BadAtom)
	    XGetErrorDatabaseText(dpy, mtype, "AtomID", "AtomID 0x%x",
				  mesg, BUFSIZ);
	else
	    XGetErrorDatabaseText(dpy, mtype, "ResourceID", "ResourceID 0x%x",
				  mesg, BUFSIZ);
	fputs("  ", fp);
	(void) fprintf(fp, mesg, event->resourceid);
	fputs("\n", fp);
    }
    XGetErrorDatabaseText(dpy, mtype, "ErrorSerial", "Error Serial #%d", 
			  mesg, BUFSIZ);
    fputs("  ", fp);
    (void) fprintf(fp, mesg, event->serial);
    XGetErrorDatabaseText(dpy, mtype, "CurrentSerial", "Current Serial #%d",
			  mesg, BUFSIZ);
    fputs("\n  ", fp);
    (void) fprintf(fp, mesg, dpy->request);
    fputs("\n", fp);
    if (event->error_code == BadImplementation) return 0;
    return 1;
}

int _XDefaultError(Display *dpy, XErrorEvent *event)
{
    if (_XPrintDefaultError (dpy, event, stderr) == 0) return 0;
    exit(1);
    /*NOTREACHED*/
}

/*ARGSUSED*/
Bool _XDefaultWireError(Display *display, XErrorEvent *he, xError *we)
{
    return True;
}

/*
 * _XError - prepare to upcall user protocol error handler
 */
int _XError (Display *dpy, xError *rep)
{
    /* 
     * X_Error packet encountered!  We need to unpack the error before
     * giving it to the user.
     */
    XEvent event; /* make it a large event */

    event.xerror.display = dpy;
    event.xerror.type = X_Error;
    event.xerror.serial = _XSetLastRequestRead(dpy, (xGenericReply *)rep);
    event.xerror.resourceid = rep->resourceID;
    event.xerror.error_code = rep->errorCode;
    event.xerror.request_code = rep->majorCode;
    event.xerror.minor_code = rep->minorCode;
    if (dpy->error_vec &&
	!(*dpy->error_vec[rep->errorCode])(dpy, &event.xerror, rep))
	return 0;
    if (_XErrorFunction != NULL) {
      	return ((*_XErrorFunction)(dpy, &event));	/* upcall */
    } else {
	return _XDefaultError(dpy, &event);
    }
}
    
/*
 * _XIOError - call user connection error handler and exit
 */
int _XIOError (Display *dpy)
{
    dpy->flags |= XlibDisplayIOError;
    if (_XIOErrorFunction != NULL)
	(*_XIOErrorFunction)(dpy);
    else
	_XDefaultIOError(dpy);
    exit (1);
}


/*
 * This routine can be used to (cheaply) get some memory within a single
 * Xlib routine for scratch space.  It is reallocated from the same place
 * each time, unless the library needs a large scratch space.
 */
char *_XAllocScratch (Display *dpy, unsigned long nbytes)
{
	if (nbytes > dpy->scratch_length) {
	    if (dpy->scratch_buffer) Xfree (dpy->scratch_buffer);
	    if (dpy->scratch_buffer = Xmalloc((unsigned) nbytes))
		dpy->scratch_length = nbytes;
	    else dpy->scratch_length = 0;
	}
	return (dpy->scratch_buffer);
}

/*
 * Given a visual id, find the visual structure for this id on this display.
 */
Visual *_XVIDtoVisual (Display *dpy, VisualID id)
{
	register int i, j, k;
	register Screen *sp;
	register Depth *dp;
	register Visual *vp;
	for (i = 0; i < dpy->nscreens; i++) {
		sp = &dpy->screens[i];
		for (j = 0; j < sp->ndepths; j++) {
			dp = &sp->depths[j];
			/* if nvisuals == 0 then visuals will be NULL */
			for (k = 0; k < dp->nvisuals; k++) {
				vp = &dp->visuals[k];
				if (vp->visualid == id) return (vp);
			}
		}
	}
	return (NULL);
}

void XFree (void *data)
{
	Xfree (data);
}

#ifdef _XNEEDBCOPYFUNC
void _Xbcopy(char *b1, char *b2, length)
{
    if (b1 < b2) {
	b2 += length;
	b1 += length;
	while (length--)
	    *--b2 = *--b1;
    } else {
	while (length--)
	    *b2++ = *b1++;
    }
}
#endif

#endif /* NEEDFORNX */

void NXProcData (Display *dpy, char *data, long len)
{
	if (dpy->bufptr + (len) <= dpy->bufmax) {
		bcopy(data, dpy->bufptr, (int)len);
		dpy->bufptr += ((len) + 3) & ~3;
	} else {
		N_XSend(dpy, data, len);
	}
}


#ifdef WORD64

/*
 * XXX This is a *really* stupid way of doing this.  It should just use 
 * dpy->bufptr directly, taking into account where in the word it is.
 */

/*
 * Data16 - Place 16 bit data in the buffer.
 *
 * "dpy" is a pointer to a Display.
 * "data" is a pointer to the data.
 * "len" is the length in bytes of the data.
 */

static void
doData16(Display *dpy, short *data, unsigned len, char *packbuffer)
{
    long *lp,*lpack;
    long i, nwords,bits;
    long mask16 = 0x000000000000ffff;

        lp = (long *)data;
        lpack = (long *)packbuffer;

/*  nwords is the number of 16 bit values to be packed,
 *  the low order 16 bits of each word will be packed
 *  into 64 bit words
 */
        nwords = len >> 1;
        bits = 48;

        for(i=0;i<nwords;i++){
	   if (bits == 48) *lpack = 0;
           *lpack ^= (*lp & mask16) << bits;
           bits -= 16 ;
           lp++;
           if(bits < 0){
               lpack++;
               bits = 48;
           }
        }
        Data(dpy, packbuffer, len);
}

void
Data16 (Display *dpy, short *data, unsigned len)
{
    char packbuffer[PACKBUFFERSIZE];
    unsigned nunits = PACKBUFFERSIZE >> 1;

    for (; len > PACKBUFFERSIZE; len -= PACKBUFFERSIZE, data += nunits) {
	doData16 (dpy, data, PACKBUFFERSIZE, packbuffer);
    }
    if (len) doData16 (dpy, data, len, packbuffer);
}

/*
 * Data32 - Place 32 bit data in the buffer.
 *
 * "dpy" is a pointer to a Display.
 * "data" is a pointer to the data.
 * "len" is the length in bytes of the data.
 */

static doData32 (Display *dpy, long *data, unsigned len, char *packbuffer)
{
    long *lp,*lpack;
    long i,bits,nwords;
    long mask32 = 0x00000000ffffffff;

        lpack = (long *) packbuffer;
        lp = data;

/*  nwords is the number of 32 bit values to be packed
 *  the low order 32 bits of each word will be packed
 *  into 64 bit words
 */
        nwords = len >> 2;
        bits = 32;

        for(i=0;i<nwords;i++){
	   if (bits == 32) *lpack = 0;
           *lpack ^= (*lp & mask32) << bits;
           bits = bits ^32;
           lp++;
           if(bits)
              lpack++;
        }
        Data(dpy, packbuffer, len);
}

Data32 (Display *dpy, long *data, unsigned len)
{
    char packbuffer[PACKBUFFERSIZE];
    unsigned nunits = PACKBUFFERSIZE >> 2;

    for (; len > PACKBUFFERSIZE; len -= PACKBUFFERSIZE, data += nunits) {
	doData32 (dpy, data, PACKBUFFERSIZE, packbuffer);
    }
    if (len) doData32 (dpy, data, len, packbuffer);
}

#endif /* WORD64 */


#ifdef NEEDFORNX

/*
 * _XFreeQ - free the queue of events, called by XCloseDisplay
 */

void _XFreeQ (void)
{
    register _XQEvent *qelt = _qfree;
  
    while (qelt) {
	register _XQEvent *qnxt = qelt->next;
	Xfree ((char *) qelt);
	qelt = qnxt;
    }
    _qfree = NULL;
    return;
}
#endif /* NEEDFORNX */

/* Make sure this produces the same string as DefineLocal/DefineSelf in xdm.
 * Otherwise, Xau will not be able to find your cookies in the Xauthority file.
 *
 * Note: POSIX says that the ``nodename'' member of utsname does _not_ have
 *       to have sufficient information for interfacing to the network,
 *       and so, you may be better off using gethostname (if it exists).
 */

#if (defined(_POSIX_SOURCE) && !defined(AIXV3)) || defined(hpux) || defined(USG) || defined(SVR4)
#define NEED_UTSNAME
#include <sys/utsname.h>
#endif

/*
 * N_XGetHostname - similar to gethostname but allows special processing.
 */
int N_XGetHostname (char *buf, int maxlen)
{
    int len;

#ifdef NEED_UTSNAME
    struct utsname name;

    uname (&name);
    len = strlen (name.nodename);
    if (len >= maxlen) len = maxlen - 1;
    strncpy (buf, name.nodename, len);
    buf[len] = '\0';
#else
    buf[0] = '\0';
    (void) gethostname (buf, maxlen);
    buf [maxlen - 1] = '\0';
    len = strlen(buf);
#endif /* NEED_UTSNAME */
    return len;
}

#ifdef NEEDFORNX
/*
 * _XScreenOfWindow - get the Screen of a given window
 */

Screen *_XScreenOfWindow (Display *dpy, Window w)
{
    register int i;
    Window root;
    int x, y;				/* dummy variables */
    unsigned int width, height, bw, depth;  /* dummy variables */

    if (XGetGeometry (dpy, w, &root, &x, &y, &width, &height,
		      &bw, &depth) == False) {
	return None;
    }
    for (i = 0; i < ScreenCount (dpy); i++) {	/* find root from list */
	if (root == RootWindow (dpy, i)) {
	    return ScreenOfDisplay (dpy, i);
	}
    }
    return NULL;
}
#endif /* NEEDFORNX */

#if (MSKCNT > 4)
/*
 * This is a macro if MSKCNT <= 4
 */
int
N_XANYSET(unsigned long *src)
{
    int i;

    for (i=0; i<MSKCNT; i++)
	if (src[ i ])
	    return (1);
    return (0);
}
#endif

#ifdef NEEDFORNX  
#ifdef CRAY
/*
 * Cray UniCOS does not have readv and writev so we emulate
 */
#include <sys/socket.h>

int _XReadV (int fd, struct iovec *iov, int iovcnt)
{
	struct msghdr hdr;

	hdr.msg_iov = iov;
	hdr.msg_iovlen = iovcnt;
	hdr.msg_accrights = 0;
	hdr.msg_accrightslen = 0;
	hdr.msg_name = 0;
	hdr.msg_namelen = 0;

	return (recvmsg (fd, &hdr, 0));
}

int _XWriteV (int fd, struct iovec *iov, int iovcnt)
{
	struct msghdr hdr;

	hdr.msg_iov = iov;
	hdr.msg_iovlen = iovcnt;
	hdr.msg_accrights = 0;
	hdr.msg_accrightslen = 0;
	hdr.msg_name = 0;
	hdr.msg_namelen = 0;

	return (sendmsg (fd, &hdr, 0));
}

#endif /* CRAY */

#if defined(SYSV) && defined(i386) && !defined(STREAMSCONN)
/*
 * SYSV/386 does not have readv so we emulate
 */
#include <sys/uio.h>

int _XReadV (int fd, struct iovec *iov, int iovcnt)
{
    int i, len, total;
    char *base;

    errno = 0;
    for (i=0, total=0;  i<iovcnt;  i++, iov++) {
	len = iov->iov_len;
	base = iov->iov_base;
	while (len > 0) {
	    register int nbytes;
	    nbytes = read(fd, base, len);
	    if (nbytes < 0 && total == 0)  return -1;
	    if (nbytes <= 0)  return total;
	    errno = 0;
	    len   -= nbytes;
	    total += nbytes;
	    base  += nbytes;
	}
    }
    return total;
}

#endif /* SYSV && i386 && !STREAMSCONN */

#ifdef STREAMSCONN
/*
 * Copyright 1988, 1989 AT&T, Inc.
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose and without fee is hereby granted, 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 AT&T not be used in advertising
 * or publicity pertaining to distribution of the software without specific,
 * written prior permission.  AT&T makes no representations about the
 * suitability of this software for any purpose.  It is provided "as is"
 * without express or implied warranty.
 *
 * AT&T DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL AT&T
 * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN 
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 */

/*
 iovec.c (C source file)
	Acc: 575557389 Mon Mar 28 08:03:09 1988
	Mod: 575557397 Mon Mar 28 08:03:17 1988
	Sta: 575557397 Mon Mar 28 08:03:17 1988
	Owner: 2011
	Group: 1985
	Permissions: 664
*/
/*
	START USER STAMP AREA
*/
/*
	END USER STAMP AREA
*/


extern char _XsTypeofStream[];
extern Xstream _XsStream[];

#define MAX_WORKAREA 4096
static char workarea[MAX_WORKAREA];



int
_XReadV (int fd, struct iovec v[], int n)
{
	int i, rc, len, size = 0;
	char * buf = workarea;
	char * p;

	if (n <= 0 || n > 16)
	{
		errno = EINVAL;
		return (-1);
	}
	for (i = 0; i < n; ++i)
	{
		if ((len = v[i].iov_len) < 0 || v[i].iov_base == NULL)
		{
			errno = EINVAL;
			return (-1);
		}
		size += len;
	}
	if ((size > MAX_WORKAREA) && ((buf = malloc (size)) == NULL))
	{
		errno = EINVAL;
		return (-1);
	}
	if((rc = (*_XsStream[_XsTypeOfStream[fd]].ReadFromStream)(fd, buf, size,
							     BUFFERING))> 0)
	{
		for (i = 0, p = buf; i < n; ++i)
		{
			memcpy (v[i].iov_base, p, len = v[i].iov_len);
			p += len;
		}
	}
	if (size > MAX_WORKAREA)
		free (buf);

	return (rc);
}

int
_XWriteV (int fd, struct iovec v[], int n)
{
	int i, rc, len, size = 0;
	char * buf = workarea;
	char * p;

	if (n <= 0 || n > 16)
	{
		errno = EINVAL;
		return (-1);
	}
	for (i = 0; i < n; ++i)
	{
		if ((len = v[i].iov_len) < 0 || v[i].iov_base == NULL)
		{
			errno = EINVAL;
			return (-1);
		}
		size += len;
	}

	if ((size > MAX_WORKAREA) && ((buf = malloc (size)) == NULL))
	{
		errno = EINVAL;
		return (-1);
	}
	for (i = 0, p = buf; i < n; ++i)
	{
		memcpy (p, v[i].iov_base, len = v[i].iov_len);
		p += len;
	}
	rc = (*_XsStream[_XsTypeOfStream[fd]].WriteToStream)(fd, buf, size);

	if (size > MAX_WORKAREA)
		free (buf);

	return (rc);
}



#endif /* STREAMSCONN */
#endif /* NEEDFORNX */