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

     /*
      * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
      * unrestricted use provided that this legend is included on all tape
      * media and as a part of the software program in whole or part.  Users
      * may copy or modify Sun RPC without charge, but are not authorized
      * to license or distribute it to anyone else except as part of a product or
      * program developed by the user.
      * 
      * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
     * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
     * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
     * 
     * Sun RPC is provided with no support and without any obligation on the
     * part of Sun Microsystems, Inc. to assist in its use, correction,
     * modification or enhancement.
     * 
     * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
     * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
     * OR ANY PART THEREOF.
     * 
     * In no event will Sun Microsystems, Inc. be liable for any lost revenue
     * or profits or other special, indirect and consequential damages, even if
     * Sun has been advised of the possibility of such damages.
     * 
     * Sun Microsystems, Inc.
     * 2550 Garcia Avenue
     * Mountain View, California  94043
     */
    /*
     * xdr_sizeof.c
     *
     * Copyright 1990 Sun Microsystems, Inc.
     *
     * General purpose routine to see how much space something will use
     * when serialized using XDR.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/11.2/sys/xdr/xdr_sizeof.c 177633 2008-03-26 15:23:12Z dfr $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/malloc.h>
    
    #include <rpc/types.h>
    #include <rpc/xdr.h>
    
    /* ARGSUSED */
    static bool_t
    x_putlong(XDR *xdrs, const long *longp)
    {
    
            xdrs->x_handy += BYTES_PER_XDR_UNIT;
            return (TRUE);
    }
    
    /* ARGSUSED */
    static bool_t
    x_putbytes(XDR *xdrs, const char *bp, u_int len)
    {
    
            xdrs->x_handy += len;
            return (TRUE);
    }
    
    static u_int
    x_getpostn(XDR *xdrs)
    {
    
            return (xdrs->x_handy);
    }
    
    /* ARGSUSED */
    static bool_t
    x_setpostn(XDR *xdrs, u_int pos)
    {
    
            /* This is not allowed */
            return (FALSE);
    }
    
    static int32_t *
    x_inline(XDR *xdrs, u_int len)
    {
    
            if (len == 0) {
                    return (NULL);
            }
            if (xdrs->x_op != XDR_ENCODE) {
                    return (NULL);
            }
            if (len < (u_int)(uintptr_t)xdrs->x_base) {
                    /* x_private was already allocated */
                    xdrs->x_handy += len;
                    return ((int32_t *) xdrs->x_private);
            } else {
                    /* Free the earlier space and allocate new area */
                    if (xdrs->x_private)
                            free(xdrs->x_private, M_RPC);
                   if ((xdrs->x_private = (caddr_t) malloc(len, M_RPC, M_WAITOK)) == NULL) {
                           xdrs->x_base = 0;
                           return (NULL);
                   }
                   xdrs->x_base = (caddr_t)(uintptr_t) len;
                   xdrs->x_handy += len;
                   return ((int32_t *) xdrs->x_private);
           }
   }
   
   static int
   harmless(void)
   {
   
           /* Always return FALSE/NULL, as the case may be */
           return (0);
   }
   
   static void
   x_destroy(XDR *xdrs)
   {
   
           xdrs->x_handy = 0;
           xdrs->x_base = 0;
           if (xdrs->x_private) {
                   free(xdrs->x_private, M_RPC);
                   xdrs->x_private = NULL;
           }
           return;
   }
   
   unsigned long
   xdr_sizeof(xdrproc_t func, void *data)
   {
           XDR x;
           struct xdr_ops ops;
           bool_t stat;
           /* to stop ANSI-C compiler from complaining */
           typedef  bool_t (* dummyfunc1)(XDR *, long *);
           typedef  bool_t (* dummyfunc2)(XDR *, caddr_t, u_int);
   
           ops.x_putlong = x_putlong;
           ops.x_putbytes = x_putbytes;
           ops.x_inline = x_inline;
           ops.x_getpostn = x_getpostn;
           ops.x_setpostn = x_setpostn;
           ops.x_destroy = x_destroy;
   
           /* the other harmless ones */
           ops.x_getlong =  (dummyfunc1) harmless;
           ops.x_getbytes = (dummyfunc2) harmless;
   
           x.x_op = XDR_ENCODE;
           x.x_ops = &ops;
           x.x_handy = 0;
           x.x_private = (caddr_t) NULL;
           x.x_base = (caddr_t) 0;
   
           stat = func(&x, data);
           if (x.x_private)
                   free(x.x_private, M_RPC);
           return (stat == TRUE ? (unsigned) x.x_handy: 0);
   }

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