lib/libc/rpc/xdr_array.c

   1 /*      $NetBSD: xdr_array.c,v 1.16 2005/08/05 10:39:05 wiz Exp $       */
   2
   3 /*
   4  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   5  * unrestricted use provided that this legend is included on all tape
   6  * media and as a part of the software program in whole or part.  Users
   7  * may copy or modify Sun RPC without charge, but are not authorized
   8  * to license or distribute it to anyone else except as part of a product or
   9  * program developed by the user.
  10  *
  11  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  12  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  13  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  14  *
  15  * Sun RPC is provided with no support and without any obligation on the
  16  * part of Sun Microsystems, Inc. to assist in its use, correction,
  17  * modification or enhancement.
  18  *
  19  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  20  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  21  * OR ANY PART THEREOF.
  22  *
  23  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  24  * or profits or other special, indirect and consequential damages, even if
  25  * Sun has been advised of the possibility of such damages.
  26  *
  27  * Sun Microsystems, Inc.
  28  * 2550 Garcia Avenue
  29  * Mountain View, California  94043
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #if defined(LIBC_SCCS) && !defined(lint)
  34 #if 0
  35 static char *sccsid = "@(#)xdr_array.c 1.10 87/08/11 Copyr 1984 Sun Micro";
  36 static char *sccsid = "@(#)xdr_array.c  2.1 88/07/29 4.0 RPCSRC";
  37 #else
  38 __RCSID("$NetBSD: xdr_array.c,v 1.16 2005/08/05 10:39:05 wiz Exp $");
  39 #endif
  40 #endif
  41
  42 /*
  43  * xdr_array.c, Generic XDR routines implementation.
  44  *
  45  * Copyright (C) 1984, Sun Microsystems, Inc.
  46  *
  47  * These are the "non-trivial" xdr primitives used to serialize and de-serialize
  48  * arrays.  See xdr.h for more info on the interface to xdr.
  49  */
  50
  51 #include "namespace.h"
  52
  53 #include <err.h>
  54 #include <stdio.h>
  55 #include <stdlib.h>
  56 #include <string.h>
  57 #include <limits.h>
  58
  59 #include <rpc/types.h>
  60 #include <rpc/xdr.h>
  61
  62 #ifdef __weak_alias
  63 __weak_alias(xdr_array,_xdr_array)
  64 __weak_alias(xdr_vector,_xdr_vector)
  65 #endif
  66
  67 /*
  68  * XDR an array of arbitrary elements
  69  * *addrp is a pointer to the array, *sizep is the number of elements.
  70  * If addrp is NULL (*sizep * elsize) bytes are allocated.
  71  * elsize is the size (in bytes) of each element, and elproc is the
  72  * xdr procedure to call to handle each element of the array.
  73  */
  74 bool_t
  75 xdr_array(xdrs, addrp, sizep, maxsize, elsize, elproc)
  76         XDR *xdrs;
  77         caddr_t *addrp;         /* array pointer */
  78         u_int *sizep;           /* number of elements */
  79         u_int maxsize;          /* max numberof elements */
  80         u_int elsize;           /* size in bytes of each element */
  81         xdrproc_t elproc;       /* xdr routine to handle each element */
  82 {
  83         u_int i;
  84         caddr_t target = *addrp;
  85         u_int c;  /* the actual element count */
  86         bool_t stat = TRUE;
  87         u_int nodesize;
  88
  89         /* like strings, arrays are really counted arrays */
  90         if (!xdr_u_int(xdrs, sizep))
  91                 return (FALSE);
  92
  93         c = *sizep;
  94         if ((c > maxsize || UINT_MAX/elsize < c) &&
  95             (xdrs->x_op != XDR_FREE))
  96                 return (FALSE);
  97         nodesize = c * elsize;
  98
  99         /*
 100          * if we are deserializing, we may need to allocate an array.
 101          * We also save time by checking for a null array if we are freeing.
 102          */
 103         if (target == NULL)
 104                 switch (xdrs->x_op) {
 105                 case XDR_DECODE:
 106                         if (c == 0)
 107                                 return (TRUE);
 108                         *addrp = target = mem_alloc(nodesize);
 109                         if (target == NULL) {
 110                                 warnx("xdr_array: out of memory");
 111                                 return (FALSE);
 112                         }
 113                         memset(target, 0, nodesize);
 114                         break;
 115
 116                 case XDR_FREE:
 117                         return (TRUE);
 118
 119                 case XDR_ENCODE:
 120                         break;
 121         }
 122
 123         /*
 124          * now we xdr each element of array
 125          */
 126         for (i = 0; (i < c) && stat; i++) {
 127                 stat = (*elproc)(xdrs, target);
 128                 target += elsize;
 129         }
 130
 131         /*
 132          * the array may need freeing
 133          */
 134         if (xdrs->x_op == XDR_FREE) {
 135                 mem_free(*addrp, nodesize);
 136                 *addrp = NULL;
 137         }
 138         return (stat);
 139 }
 140
 141 /*
 142  * xdr_vector():
 143  *
 144  * XDR a fixed length array. Unlike variable-length arrays,
 145  * the storage of fixed length arrays is static and unfreeable.
 146  * > basep: base of the array
 147  * > size: size of the array
 148  * > elemsize: size of each element
 149  * > xdr_elem: routine to XDR each element
 150  */
 151 bool_t
 152 xdr_vector(xdrs, basep, nelem, elemsize, xdr_elem)
 153         XDR *xdrs;
 154         char *basep;
 155         u_int nelem;
 156         u_int elemsize;
 157         xdrproc_t xdr_elem;
 158 {
 159         u_int i;
 160         char *elptr;
 161
 162         elptr = basep;
 163         for (i = 0; i < nelem; i++) {
 164                 if (!(*xdr_elem)(xdrs, elptr)) {
 165                         return(FALSE);
 166                 }
 167                 elptr += elemsize;
 168         }
 169         return(TRUE);
 170 }