src/rx/xdr_update.c

   1 /*
   2  * xdr_update.c: Additions to release 3.0 XDR routines required
   3  *      for rpcgen.  These routines are from release 3.2BETA and
   4  *      may be updated before final release.
   5  *
   6  * Copyright (C) 1986, Sun Microsystems, Inc.
   7  *
   8  */
   9 #include <afsconfig.h>
  10 #include <afs/param.h>
  11
  12
  13 #ifndef NeXT
  14 #include "xdr.h"
  15
  16 #ifdef NULL                     /* Strict ANSI-C aborts if we redefine this */
  17 #undef NULL
  18 #endif
  19
  20 #define NULL 0
  21
  22 #define LASTUNSIGNED    ((u_int)0-1)
  23
  24 /*
  25  * xdr_pointer():
  26  *
  27  * XDR a pointer to a possibly recursive data structure. This
  28  * differs with xdr_reference in that it can serialize/deserialiaze
  29  * trees correctly.
  30  *
  31  *  What's sent is actually a union:
  32  *
  33  *  union object_pointer switch (boolean b) {
  34  *  case TRUE: object_data data;
  35  *  case FALSE: void nothing;
  36  *  }
  37  *
  38  * > objpp: Pointer to the pointer to the object.
  39  * > obj_size: size of the object.
  40  * > xdr_obj: routine to XDR an object.
  41  *
  42  */
  43 bool_t
  44 xdr_pointer(XDR * xdrs, char **objpp, u_int obj_size,
  45             xdrproc_t xdr_obj)
  46 {
  47
  48     bool_t more_data;
  49
  50     more_data = (*objpp != NULL);
  51     if (!xdr_bool(xdrs, &more_data)) {
  52         return (FALSE);
  53     }
  54     if (!more_data) {
  55         *objpp = NULL;
  56         return (TRUE);
  57     }
  58     return (xdr_reference(xdrs, objpp, obj_size, xdr_obj));
  59 }
  60
  61 /*
  62  * xdr_vector():
  63  *
  64  * XDR a fixed length array. Unlike variable-length arrays,
  65  * the storage of fixed length arrays is static and unfreeable.
  66  * > basep: base of the array
  67  * > size: size of the array
  68  * > elemsize: size of each element
  69  * > xdr_elem: routine to XDR each element
  70  */
  71 bool_t
  72 xdr_vector(XDR * xdrs, char *basep, u_int nelem,
  73            u_int elemsize, xdrproc_t xdr_elem)
  74 {
  75     u_int i;
  76     char *elptr;
  77
  78     elptr = basep;
  79     for (i = 0; i < nelem; i++) {
  80         if (!(*xdr_elem) (xdrs, elptr, LASTUNSIGNED)) {
  81             return (FALSE);
  82         }
  83         elptr += elemsize;
  84     }
  85     return (TRUE);
  86 }
  87 #endif /* NeXT */