lib/libc/rpc/xdr_array.c

   1 /*      $NetBSD: xdr_array.c,v 1.17 2012/06/25 22:32:45 abs 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 1.17 2012/06/25 22:32:45 abs 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(XDR *xdrs, caddr_t *addrp, u_int *sizep, u_int maxsize, u_int elsize,
  76     xdrproc_t elproc)
  77 {
  78         u_int i;
  79         caddr_t target = *addrp;
  80         u_int c;  /* the actual element count */
  81         bool_t stat = TRUE;
  82         u_int nodesize;
  83
  84         /* like strings, arrays are really counted arrays */
  85         if (!xdr_u_int(xdrs, sizep))
  86                 return (FALSE);
  87
  88         c = *sizep;
  89         if ((c > maxsize || UINT_MAX/elsize < c) &&
  90             (xdrs->x_op != XDR_FREE))
  91                 return (FALSE);
  92         nodesize = c * elsize;
  93
  94         /*
  95          * if we are deserializing, we may need to allocate an array.
  96          * We also save time by checking for a null array if we are freeing.
  97          */
  98         if (target == NULL)
  99                 switch (xdrs->x_op) {
 100                 case XDR_DECODE:
 101                         if (c == 0)
 102                                 return (TRUE);
 103                         *addrp = target = mem_alloc(nodesize);
 104                         if (target == NULL) {
 105                                 warnx("xdr_array: out of memory");
 106                                 return (FALSE);
 107                         }
 108                         memset(target, 0, nodesize);
 109                         break;
 110
 111                 case XDR_FREE:
 112                         return (TRUE);
 113
 114                 case XDR_ENCODE:
 115                         break;
 116         }
 117
 118         /*
 119          * now we xdr each element of array
 120          */
 121         for (i = 0; (i < c) && stat; i++) {
 122                 stat = (*elproc)(xdrs, target);
 123                 target += elsize;
 124         }
 125
 126         /*
 127          * the array may need freeing
 128          */
 129         if (xdrs->x_op == XDR_FREE) {
 130                 mem_free(*addrp, nodesize);
 131                 *addrp = NULL;
 132         }
 133         return (stat);
 134 }
 135
 136 /*
 137  * xdr_vector():
 138  *
 139  * XDR a fixed length array. Unlike variable-length arrays,
 140  * the storage of fixed length arrays is static and unfreeable.
 141  * > basep: base of the array
 142  * > size: size of the array
 143  * > elemsize: size of each element
 144  * > xdr_elem: routine to XDR each element
 145  */
 146 bool_t
 147 xdr_vector(XDR *xdrs, char *basep, u_int nelem, u_int elemsize,
 148     xdrproc_t xdr_elem)
 149 {
 150         u_int i;
 151         char *elptr;
 152
 153         elptr = basep;
 154         for (i = 0; i < nelem; i++) {
 155                 if (!(*xdr_elem)(xdrs, elptr)) {
 156                         return(FALSE);
 157                 }
 158                 elptr += elemsize;
 159         }
 160         return(TRUE);
 161 }