src/rx/xdr_refernce.c

   1 /*
   2  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   3  * unrestricted use provided that this legend is included on all tape
   4  * media and as a part of the software program in whole or part.  Users
   5  * may copy or modify Sun RPC without charge, but are not authorized
   6  * to license or distribute it to anyone else except as part of a product or
   7  * program developed by the user.
   8  *
   9  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  10  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  11  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  12  *
  13  * Sun RPC is provided with no support and without any obligation on the
  14  * part of Sun Microsystems, Inc. to assist in its use, correction,
  15  * modification or enhancement.
  16  *
  17  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  18  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  19  * OR ANY PART THEREOF.
  20  *
  21  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  22  * or profits or other special, indirect and consequential damages, even if
  23  * Sun has been advised of the possibility of such damages.
  24  *
  25  * Sun Microsystems, Inc.
  26  * 2550 Garcia Avenue
  27  * Mountain View, California  94043
  28  */
  29 #include <afsconfig.h>
  30 #include <afs/param.h>
  31
  32 #include <roken.h>
  33
  34 #include "rx.h"
  35
  36
  37 #ifndef NeXT
  38
  39 /*
  40  * xdr_reference.c, Generic XDR routines impelmentation.
  41  *
  42  * Copyright (C) 1984, Sun Microsystems, Inc.
  43  *
  44  * These are the "non-trivial" xdr primitives used to serialize and de-serialize
  45  * "pointers".  See xdr.h for more info on the interface to xdr.
  46  */
  47
  48 #include "xdr.h"
  49 #define LASTUNSIGNED    ((u_int)0-1)
  50
  51 /*
  52  * XDR an indirect pointer
  53  * xdr_reference is for recursively translating a structure that is
  54  * referenced by a pointer inside the structure that is currently being
  55  * translated.  pp references a pointer to storage. If *pp is null
  56  * the  necessary storage is allocated.
  57  * size is the sizeof the referneced structure.
  58  * proc is the routine to handle the referenced structure.
  59  */
  60 bool_t
  61 xdr_reference(XDR *xdrs,
  62               caddr_t *pp, /* the pointer to work on */
  63               u_int size, /* size of the object pointed to */
  64               xdrproc_t proc)  /* xdr routine to handle the object */
  65 {
  66     caddr_t loc = *pp;
  67     bool_t stat;
  68
  69     if (loc == NULL)
  70         switch (xdrs->x_op) {
  71         case XDR_FREE:
  72             return (TRUE);
  73
  74         case XDR_DECODE:
  75             *pp = loc = osi_alloc(size);
  76             if (loc == NULL) {
  77                 return (FALSE);
  78             }
  79             memset(loc, 0, (int)size);
  80             break;
  81         case XDR_ENCODE:
  82             break;
  83         }
  84
  85     stat = (*proc) (xdrs, loc, LASTUNSIGNED);
  86
  87     if (xdrs->x_op == XDR_FREE) {
  88         osi_free(loc, size);
  89         *pp = NULL;
  90     }
  91     return (stat);
  92 }
  93 #endif /* !NeXT */