sunrpc/xdr_array.c

   1 /* @(#)xdr_array.c      2.1 88/07/29 4.0 RPCSRC */
   2 /*
   3  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   4  * unrestricted use provided that this legend is included on all tape
   5  * media and as a part of the software program in whole or part.  Users
   6  * may copy or modify Sun RPC without charge, but are not authorized
   7  * to license or distribute it to anyone else except as part of a product or
   8  * program developed by the user.
   9  *
  10  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  11  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  12  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  13  *
  14  * Sun RPC is provided with no support and without any obligation on the
  15  * part of Sun Microsystems, Inc. to assist in its use, correction,
  16  * modification or enhancement.
  17  *
  18  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  19  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  20  * OR ANY PART THEREOF.
  21  *
  22  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  23  * or profits or other special, indirect and consequential damages, even if
  24  * Sun has been advised of the possibility of such damages.
  25  *
  26  * Sun Microsystems, Inc.
  27  * 2550 Garcia Avenue
  28  * Mountain View, California  94043
  29  */
  30 #if !defined(lint) && defined(SCCSIDS)
  31 static char sccsid[] = "@(#)xdr_array.c 1.10 87/08/11 Copyr 1984 Sun Micro";
  32 #endif
  33
  34 /*
  35  * xdr_array.c, Generic XDR routines impelmentation.
  36  *
  37  * Copyright (C) 1984, Sun Microsystems, Inc.
  38  *
  39  * These are the "non-trivial" xdr primitives used to serialize and de-serialize
  40  * arrays.  See xdr.h for more info on the interface to xdr.
  41  */
  42
  43 #include <stdio.h>
  44
  45 #include <rpc/types.h>
  46 #include <rpc/xdr.h>
  47
  48 #define LASTUNSIGNED    ((u_int)0-1)
  49
  50
  51 /*
  52  * XDR an array of arbitrary elements
  53  * *addrp is a pointer to the array, *sizep is the number of elements.
  54  * If addrp is NULL (*sizep * elsize) bytes are allocated.
  55  * elsize is the size (in bytes) of each element, and elproc is the
  56  * xdr procedure to call to handle each element of the array.
  57  */
  58 bool_t
  59 xdr_array(xdrs, addrp, sizep, maxsize, elsize, elproc)
  60         register XDR *xdrs;
  61         caddr_t *addrp;         /* array pointer */
  62         u_int *sizep;           /* number of elements */
  63         u_int maxsize;          /* max numberof elements */
  64         u_int elsize;           /* size in bytes of each element */
  65         xdrproc_t elproc;       /* xdr routine to handle each element */
  66 {
  67         register u_int i;
  68         register caddr_t target = *addrp;
  69         register u_int c;  /* the actual element count */
  70         register bool_t stat = TRUE;
  71         register u_int nodesize;
  72
  73         /* like strings, arrays are really counted arrays */
  74         if (! xdr_u_int(xdrs, sizep)) {
  75                 return (FALSE);
  76         }
  77         c = *sizep;
  78         if ((c > maxsize) && (xdrs->x_op != XDR_FREE)) {
  79                 return (FALSE);
  80         }
  81         nodesize = c * elsize;
  82
  83         /*
  84          * if we are deserializing, we may need to allocate an array.
  85          * We also save time by checking for a null array if we are freeing.
  86          */
  87         if (target == NULL)
  88                 switch (xdrs->x_op) {
  89                 case XDR_DECODE:
  90                         if (c == 0)
  91                                 return (TRUE);
  92                         *addrp = target = mem_alloc(nodesize);
  93                         if (target == NULL) {
  94                                 (void) fprintf(stderr,
  95                                         "xdr_array: out of memory\n");
  96                                 return (FALSE);
  97                         }
  98                         bzero(target, nodesize);
  99                         break;
 100
 101                 case XDR_FREE:
 102                         return (TRUE);
 103         }
 104
 105         /*
 106          * now we xdr each element of array
 107          */
 108         for (i = 0; (i < c) && stat; i++) {
 109                 stat = (*elproc)(xdrs, target, LASTUNSIGNED);
 110                 target += elsize;
 111         }
 112
 113         /*
 114          * the array may need freeing
 115          */
 116         if (xdrs->x_op == XDR_FREE) {
 117                 mem_free(*addrp, nodesize);
 118                 *addrp = NULL;
 119         }
 120         return (stat);
 121 }
 122
 123 /*
 124  * xdr_vector():
 125  *
 126  * XDR a fixed length array. Unlike variable-length arrays,
 127  * the storage of fixed length arrays is static and unfreeable.
 128  * > basep: base of the array
 129  * > size: size of the array
 130  * > elemsize: size of each element
 131  * > xdr_elem: routine to XDR each element
 132  */
 133 bool_t
 134 xdr_vector(xdrs, basep, nelem, elemsize, xdr_elem)
 135         register XDR *xdrs;
 136         register char *basep;
 137         register u_int nelem;
 138         register u_int elemsize;
 139         register xdrproc_t xdr_elem;
 140 {
 141         register u_int i;
 142         register char *elptr;
 143
 144         elptr = basep;
 145         for (i = 0; i < nelem; i++) {
 146                 if (! (*xdr_elem)(xdrs, elptr, LASTUNSIGNED)) {
 147                         return(FALSE);
 148                 }
 149                 elptr += elemsize;
 150         }
 151         return(TRUE);
 152 }
 153