/************************************************************************
**                                                                      *
** Copyright © 1996 Digital Equipment Corporation.                      *
** All rights reserved.                                                 *
**                                                                      *
** Redistribution and use in source and binary forms are permitted      *
** provided that the above copyright notice and this paragraph are      *
** duplicated in all such forms and that any documentation,             *
** advertising materials, and other materials related to such           *
** distribution and use acknowledge that the software was developed     *
** by Digital Equipment Corporation.  The name of the                   *
** Corporation may not be used to endorse or promote products derived   *
** from this software without specific prior written permission.        *
** THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR       *
** IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED       *
** WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.  *
**                                                                      *
*************************************************************************
**++
**  FACILITY:
**
**      ppp_mgmt.h.
**
**  ABSTRACT:
**
**      This header file implements macros to do memory allocation
**      on VMS.
**
**  AUTHORS:
**
**      Patrick Crilly,   Networks Engineering (Australia).
**
**  CREATION DATE:
**
**      14-February-1996
**
**  MODIFICATION HISTORY:
**
**      17-December-1996  Barry W. Kierstein
**                        Replaced the standard Digital copyright with
**                        one compatible with the CMU copyright.
**
**      24-July-1996      Barry W. Kierstein
**                        Corrected copyright notice.
**
**      14-February-1996  Original version.
**
**--
*/
#ifndef _PPP_MEM_VMS_H_
#define _PPP_MEM_VMS_H_

/*
**
** import definitions:
**        SS$_xxx
**
*/
#ifndef __SSDEF_LOADED
#include "ssdef.h"
#endif

/*
**
** import definitions:
**        exe_std$xxx rotuines
**
*/
#ifndef __EXE_ROUTINES_LOADED
#include "exe_routines.h"
#endif

/*
**
** import definitions:
**        DYN$C_BUFIO
**
*/
#ifndef __DYNDEF_LOADED
#include "dyndef.h"
#endif

/*
** Define a VMS type for PPP
*/
#define PPP_MEM_TYPE     DYN$C_BUFIO 
#define PPP_MEM_SUBTYPE  0

typedef struct vms_mem_hdr
{
    u_long  flink;   /* forward queue link        */
    u_long  blink;   /* backward queue link       */
    short   size;    /* block size                */
    u_char  type;    /* block type                */
    u_char  subtype; /* block subtype             */
    u_long  fill;    /* force quadword alignement */
} vms_mem_hdr;

#define MEM_HDR_SIZE sizeof(vms_mem_hdr)

#define ALLOC_MEM(addr, bsize, cast ) \
{ \
    vms_mem_hdr *__hdr_p; \
    signed __int32 __size; \
    if ( exe_std$alononpaged((bsize)+ MEM_HDR_SIZE, &__size, (void **)&__hdr_p) == SS$_NORMAL ) \
    { \
	__hdr_p->size    = __size; \
	__hdr_p->type    = PPP_MEM_TYPE; \
	__hdr_p->subtype = PPP_MEM_SUBTYPE; \
    	(addr) = (cast) ((int)__hdr_p + MEM_HDR_SIZE); \
    } \
    else addr = NULL; \
}

#define DEALLOC_MEM(addr) exe_std$deanonpaged((char *)addr - MEM_HDR_SIZE)

#endif /* _PPP_MEM_VMS_H */