4.3BSD - /usr/src/new/sunrpc/xdr_mem.c

   1: /*
   2:  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   3:  * unrestricted use provided that this legend is included on all tape
   4:  * media and as a part of the software program in whole or part.  Users
   5:  * may copy or modify Sun RPC without charge, but are not authorized
   6:  * to license or distribute it to anyone else except as part of a product or
   7:  * program developed by the user.
   8:  *
   9:  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  10:  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  11:  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  12:  *
  13:  * Sun RPC is provided with no support and without any obligation on the
  14:  * part of Sun Microsystems, Inc. to assist in its use, correction,
  15:  * modification or enhancement.
  16:  *
  17:  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  18:  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  19:  * OR ANY PART THEREOF.
  20:  *
  21:  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  22:  * or profits or other special, indirect and consequential damages, even if
  23:  * Sun has been advised of the possibility of such damages.
  24:  *
  25:  * Sun Microsystems, Inc.
  26:  * 2550 Garcia Avenue
  27:  * Mountain View, California  94043
  28:  */
  29: #ifndef lint
  30: static char sccsid[] = "@(#)xdr_mem.c 1.4 85/03/14 Copyr 1984 Sun Micro";
  31: #endif
  32: 
  33: /*
  34:  * xdr_mem.h, XDR implementation using memory buffers.
  35:  *
  36:  * Copyright (C) 1984, Sun Microsystems, Inc.
  37:  *
  38:  * If you have some data to be interpreted as external data representation
  39:  * or to be converted to external data representation in a memory buffer,
  40:  * then this is the package for you.
  41:  *
  42:  */
  43: 
  44: #include "types.h"
  45: #include "xdr.h"
  46: #include <netinet/in.h>
  47: 
  48: static bool_t   xdrmem_getlong();
  49: static bool_t   xdrmem_putlong();
  50: static bool_t   xdrmem_getbytes();
  51: static bool_t   xdrmem_putbytes();
  52: static u_int    xdrmem_getpos();
  53: static bool_t   xdrmem_setpos();
  54: static long *   xdrmem_inline();
  55: static void xdrmem_destroy();
  56: 
  57: static struct   xdr_ops xdrmem_ops = {
  58:     xdrmem_getlong,
  59:     xdrmem_putlong,
  60:     xdrmem_getbytes,
  61:     xdrmem_putbytes,
  62:     xdrmem_getpos,
  63:     xdrmem_setpos,
  64:     xdrmem_inline,
  65:     xdrmem_destroy
  66: };
  67: 
  68: /*
  69:  * The procedure xdrmem_create initializes a stream descriptor for a
  70:  * memory buffer.
  71:  */
  72: void
  73: xdrmem_create(xdrs, addr, size, op)
  74:     register XDR *xdrs;
  75:     caddr_t addr;
  76:     u_int size;
  77:     enum xdr_op op;
  78: {
  79: 
  80:     xdrs->x_op = op;
  81:     xdrs->x_ops = &xdrmem_ops;
  82:     xdrs->x_private = xdrs->x_base = addr;
  83:     xdrs->x_handy = size;
  84: }
  85: 
  86: static void
  87: xdrmem_destroy(/*xdrs*/)
  88:     /*XDR *xdrs;*/
  89: {
  90: }
  91: 
  92: static bool_t
  93: xdrmem_getlong(xdrs, lp)
  94:     register XDR *xdrs;
  95:     long *lp;
  96: {
  97: 
  98:     if ((xdrs->x_handy -= sizeof(long)) < 0)
  99:         return (FALSE);
 100:     *lp = ntohl(*((long *)(xdrs->x_private)));
 101:     xdrs->x_private += sizeof(long);
 102:     return (TRUE);
 103: }
 104: 
 105: static bool_t
 106: xdrmem_putlong(xdrs, lp)
 107:     register XDR *xdrs;
 108:     long *lp;
 109: {
 110: 
 111:     if ((xdrs->x_handy -= sizeof(long)) < 0)
 112:         return (FALSE);
 113:     *(long *)xdrs->x_private = htonl(*lp);
 114:     xdrs->x_private += sizeof(long);
 115:     return (TRUE);
 116: }
 117: 
 118: static bool_t
 119: xdrmem_getbytes(xdrs, addr, len)
 120:     register XDR *xdrs;
 121:     caddr_t addr;
 122:     register u_int len;
 123: {
 124: 
 125:     if ((xdrs->x_handy -= len) < 0)
 126:         return (FALSE);
 127:     bcopy(xdrs->x_private, addr, len);
 128:     xdrs->x_private += len;
 129:     return (TRUE);
 130: }
 131: 
 132: static bool_t
 133: xdrmem_putbytes(xdrs, addr, len)
 134:     register XDR *xdrs;
 135:     caddr_t addr;
 136:     register u_int len;
 137: {
 138: 
 139:     if ((xdrs->x_handy -= len) < 0)
 140:         return (FALSE);
 141:     bcopy(addr, xdrs->x_private, len);
 142:     xdrs->x_private += len;
 143:     return (TRUE);
 144: }
 145: 
 146: static u_int
 147: xdrmem_getpos(xdrs)
 148:     register XDR *xdrs;
 149: {
 150: 
 151:     return ((u_int)xdrs->x_private - (u_int)xdrs->x_base);
 152: }
 153: 
 154: static bool_t
 155: xdrmem_setpos(xdrs, pos)
 156:     register XDR *xdrs;
 157:     u_int pos;
 158: {
 159:     register caddr_t newaddr = xdrs->x_base + pos;
 160:     register caddr_t lastaddr = xdrs->x_private + xdrs->x_handy;
 161: 
 162:     if ((long)newaddr > (long)lastaddr)
 163:         return (FALSE);
 164:     xdrs->x_private = newaddr;
 165:     xdrs->x_handy = (int)lastaddr - (int)newaddr;
 166:     return (TRUE);
 167: }
 168: 
 169: static long *
 170: xdrmem_inline(xdrs, len)
 171:     register XDR *xdrs;
 172:     int len;
 173: {
 174:     long *buf = 0;
 175: 
 176:     if (xdrs->x_handy >= len) {
 177:         xdrs->x_handy -= len;
 178:         buf = (long *) xdrs->x_private;
 179:         xdrs->x_private += len;
 180:     }
 181:     return (buf);
 182: }

Defined functions

Defined variables