/* begincopyright
  Copyright (c) 1988, 1991 Xerox Corporation. All rights reserved.
  Use and copying of this software and preparation of derivative works based
  upon this software are permitted. Any distribution of this software or
  derivative works must comply with all applicable United States export
  control laws. This software is made available AS IS, and Xerox Corporation
  makes no warranty about the software, its performance or its conformity to
  any specification. Any person obtaining a copy of this software is requested
  to send their name and post office or electronic mail address to:
    PCR Coordinator
    Xerox PARC
    3333 Coyote Hill Rd.
    Palo Alto, CA 94304
  endcopyright */

/*
 * XNSRouterGlue.c
 *
 * XR interface to Mentat XNS Router using ND variables
 *
 * Demers, November 27, 1989 3:08:45 pm PST
 * Plass, February 18, 1992 10:44:24 am PST
 */

#include <xr/Errno.h>
#include <xr/Threads.h>
#include <xr/UIO.h>


#include <sys/file.h>
#include <stropts.h>

#ifndef _COURMUX_
#   include <courmux.h>
#endif

#ifndef COURIERVERSION
#   include <courier/courier.h>
#endif

 

#define XR_GetEnv(x) getenv(x)

/*
 * The folowing comes from <nd.h>
 *   (which won't compile without including a whole bunch of other junk, so ...)
 */

#define XNS_ROUTER_NAME_DEF	"/dev/xr"

#define	ND_BASE		('N' << 8)	/** base */
#define	ND_GET		(ND_BASE + 0)	/** Get a value */
#define	ND_SET		(ND_BASE + 1)	/** Set a value */

/* (end of includes from <nd.h> */


/*
 * Create Handle
 */

typedef XR_Fildes XR_XNSRouterDescriptor;

XR_XNSRouterDescriptor
XR_CreateXNSRouterHandle ()
{
    XR_XNSRouterDescriptor d;
    char *name;

    name = (char *)XR_GetEnv("XNS_ROUTER_NAME");
    if( name == NIL ) {
        name = XNS_ROUTER_NAME_DEF;
    }
    d = XR_OpenStream(name, O_RDWR, 0);
    if( d < 0 ) d = -(XR_GetErrno());
    return d;
}


/*
 * Destroy Handle
 */

void
XR_DestroyXNSRouterHandle (d)
    XR_XNSRouterDescriptor d;
{
    (void)XR_Close(d);
}


/*
 * Get or Set Parameter
 */


static int
XR_GetOrSetXNSRouterParameter(d, cmd, buf, nBytes)
    XR_XNSRouterDescriptor d;
    int cmd;
    char *buf;
    unsigned nBytes;
{
    struct strioctl ibuf;
    int ans;

    ibuf.ic_cmd = cmd;
    ibuf.ic_timout = 0; /* -1 ??? */
    ibuf.ic_dp = buf;
    ibuf.ic_len = nBytes;
    ans = XR_IOCtl(d, I_STR, &ibuf);
    if( ans == -1 ) ans = -(XR_GetErrno());
    return ans;
}


int
XR_GetXNSRouterParameter(d, buf, nBytes)
    XR_XNSRouterDescriptor d;
    char *buf;
    unsigned nBytes;
{
    return( XR_GetOrSetXNSRouterParameter(d, ND_GET, buf, nBytes) );
}


int
XR_SetXNSRouterParameter(d, buf, nBytes)
    XR_XNSRouterDescriptor d;
    char *buf;
    unsigned nBytes;
{
    return( XR_GetOrSetXNSRouterParameter(d, ND_SET, buf, nBytes) );
}