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FreeBSD/Linux Kernel Cross Reference
sys/xdr/xdr_array.c

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    1 /*      $NetBSD: xdr_array.c,v 1.12 2000/01/22 22:19:18 mycroft 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 #if defined(LIBC_SCCS) && !defined(lint)
   33 static char *sccsid2 = "@(#)xdr_array.c 1.10 87/08/11 Copyr 1984 Sun Micro";
   34 static char *sccsid = "@(#)xdr_array.c  2.1 88/07/29 4.0 RPCSRC";
   35 #endif
   36 #include <sys/cdefs.h>
   37 __FBSDID("$FreeBSD: stable/8/lib/libc/xdr/xdr_array.c 136582 2004-10-16 06:32:43Z obrien $");
   38 
   39 /*
   40  * xdr_array.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  * arrays.  See xdr.h for more info on the interface to xdr.
   46  */
   47 
   48 #include "namespace.h"
   49 #include <err.h>
   50 #include <limits.h>
   51 #include <stdio.h>
   52 #include <stdlib.h>
   53 #include <string.h>
   54 
   55 #include <rpc/types.h>
   56 #include <rpc/xdr.h>
   57 #include "un-namespace.h"
   58 
   59 /*
   60  * XDR an array of arbitrary elements
   61  * *addrp is a pointer to the array, *sizep is the number of elements.
   62  * If addrp is NULL (*sizep * elsize) bytes are allocated.
   63  * elsize is the size (in bytes) of each element, and elproc is the
   64  * xdr procedure to call to handle each element of the array.
   65  */
   66 bool_t
   67 xdr_array(xdrs, addrp, sizep, maxsize, elsize, elproc)
   68         XDR *xdrs;
   69         caddr_t *addrp;         /* array pointer */
   70         u_int *sizep;           /* number of elements */
   71         u_int maxsize;          /* max numberof elements */
   72         u_int elsize;           /* size in bytes of each element */
   73         xdrproc_t elproc;       /* xdr routine to handle each element */
   74 {
   75         u_int i;
   76         caddr_t target = *addrp;
   77         u_int c;  /* the actual element count */
   78         bool_t stat = TRUE;
   79         u_int nodesize;
   80 
   81         /* like strings, arrays are really counted arrays */
   82         if (!xdr_u_int(xdrs, sizep)) {
   83                 return (FALSE);
   84         }
   85         c = *sizep;
   86         if ((c > maxsize || UINT_MAX/elsize < c) &&
   87             (xdrs->x_op != XDR_FREE)) {
   88                 return (FALSE);
   89         }
   90         nodesize = c * elsize;
   91 
   92         /*
   93          * if we are deserializing, we may need to allocate an array.
   94          * We also save time by checking for a null array if we are freeing.
   95          */
   96         if (target == NULL)
   97                 switch (xdrs->x_op) {
   98                 case XDR_DECODE:
   99                         if (c == 0)
  100                                 return (TRUE);
  101                         *addrp = target = mem_alloc(nodesize);
  102                         if (target == NULL) {
  103                                 warnx("xdr_array: out of memory");
  104                                 return (FALSE);
  105                         }
  106                         memset(target, 0, nodesize);
  107                         break;
  108 
  109                 case XDR_FREE:
  110                         return (TRUE);
  111 
  112                 case XDR_ENCODE:
  113                         break;
  114         }
  115         
  116         /*
  117          * now we xdr each element of array
  118          */
  119         for (i = 0; (i < c) && stat; i++) {
  120                 stat = (*elproc)(xdrs, target);
  121                 target += elsize;
  122         }
  123 
  124         /*
  125          * the array may need freeing
  126          */
  127         if (xdrs->x_op == XDR_FREE) {
  128                 mem_free(*addrp, nodesize);
  129                 *addrp = NULL;
  130         }
  131         return (stat);
  132 }
  133 
  134 /*
  135  * xdr_vector():
  136  *
  137  * XDR a fixed length array. Unlike variable-length arrays,
  138  * the storage of fixed length arrays is static and unfreeable.
  139  * > basep: base of the array
  140  * > size: size of the array
  141  * > elemsize: size of each element
  142  * > xdr_elem: routine to XDR each element
  143  */
  144 bool_t
  145 xdr_vector(xdrs, basep, nelem, elemsize, xdr_elem)
  146         XDR *xdrs;
  147         char *basep;
  148         u_int nelem;
  149         u_int elemsize;
  150         xdrproc_t xdr_elem;     
  151 {
  152         u_int i;
  153         char *elptr;
  154 
  155         elptr = basep;
  156         for (i = 0; i < nelem; i++) {
  157                 if (!(*xdr_elem)(xdrs, elptr)) {
  158                         return(FALSE);
  159                 }
  160                 elptr += elemsize;
  161         }
  162         return(TRUE);   
  163 }

Cache object: d8d74d0410a0986cb05b362bd78c9378


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