1 /* @(#)xdr.c 2.1 88/07/29 4.0 RPCSRC */
3 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
4 * unrestricted use provided that this legend is included on all tape
5 * media and as a part of the software program in whole or part. Users
6 * may copy or modify Sun RPC without charge, but are not authorized
7 * to license or distribute it to anyone else except as part of a product or
8 * program developed by the user.
10 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
11 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
12 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
14 * Sun RPC is provided with no support and without any obligation on the
15 * part of Sun Microsystems, Inc. to assist in its use, correction,
16 * modification or enhancement.
18 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
19 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
20 * OR ANY PART THEREOF.
22 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
23 * or profits or other special, indirect and consequential damages, even if
24 * Sun has been advised of the possibility of such damages.
26 * Sun Microsystems, Inc.
28 * Mountain View, California 94043
30 #if !defined(lint) && defined(SCCSIDS)
31 static char sccsid[] = "@(#)xdr.c 1.35 87/08/12";
35 * xdr.c, Generic XDR routines implementation.
37 * Copyright (C) 1986, Sun Microsystems, Inc.
39 * These are the "generic" xdr routines used to serialize and de-serialize
40 * most common data items. See xdr.h for more info on the interface to
49 #include <rpc/types.h>
57 * constants specific to the xdr "protocol"
59 #define XDR_FALSE ((long) 0)
60 #define XDR_TRUE ((long) 1)
61 #define LASTUNSIGNED ((u_int) 0-1)
66 static const char xdr_zero[BYTES_PER_XDR_UNIT] = {0, 0, 0, 0};
69 * Free a data structure using XDR
70 * Not a filter, but a convenient utility nonetheless
73 xdr_free (xdrproc_t proc, char *objp)
95 xdr_int (XDR *xdrs, int *ip)
98 #if INT_MAX < LONG_MAX
105 return XDR_PUTLONG (xdrs, &l);
108 if (!XDR_GETLONG (xdrs, &l))
117 #elif INT_MAX == LONG_MAX
118 return INTUSE(xdr_long) (xdrs, (long *) ip);
119 #elif INT_MAX == SHRT_MAX
120 return INTUSE(xdr_short) (xdrs, (short *) ip);
122 #error unexpected integer sizes in_xdr_int()
128 * XDR unsigned integers
131 xdr_u_int (XDR *xdrs, u_int *up)
133 #if UINT_MAX < ULONG_MAX
140 return XDR_PUTLONG (xdrs, &l);
143 if (!XDR_GETLONG (xdrs, &l))
147 *up = (u_int) (u_long) l;
152 #elif UINT_MAX == ULONG_MAX
153 return INTUSE(xdr_u_long) (xdrs, (u_long *) up);
154 #elif UINT_MAX == USHRT_MAX
155 return INTUSE(xdr_short) (xdrs, (short *) up);
157 #error unexpected integer sizes in_xdr_u_int()
164 * The definition of xdr_long() is kept for backward
165 * compatibility. Instead xdr_int() should be used.
168 xdr_long (XDR *xdrs, long *lp)
171 if (xdrs->x_op == XDR_ENCODE
172 && (sizeof (int32_t) == sizeof (long)
173 || (int32_t) *lp == *lp))
174 return XDR_PUTLONG (xdrs, lp);
176 if (xdrs->x_op == XDR_DECODE)
177 return XDR_GETLONG (xdrs, lp);
179 if (xdrs->x_op == XDR_FREE)
187 * XDR unsigned long integers
188 * The definition of xdr_u_long() is kept for backward
189 * compatibility. Instead xdr_u_int() should be used.
192 xdr_u_long (XDR *xdrs, u_long *ulp)
200 if (XDR_GETLONG (xdrs, &tmp) == FALSE)
203 *ulp = (uint32_t) tmp;
208 if (sizeof (uint32_t) != sizeof (u_long)
209 && (uint32_t) *ulp != *ulp)
212 return XDR_PUTLONG (xdrs, (long *) ulp);
223 * same as xdr_u_hyper - open coded to save a proc call!
226 xdr_hyper (XDR *xdrs, quad_t *llp)
230 if (xdrs->x_op == XDR_ENCODE)
232 t1 = (long) ((*llp) >> 32);
234 return (XDR_PUTLONG(xdrs, &t1) && XDR_PUTLONG(xdrs, &t2));
237 if (xdrs->x_op == XDR_DECODE)
239 if (!XDR_GETLONG(xdrs, &t1) || !XDR_GETLONG(xdrs, &t2))
241 *llp = ((quad_t) t1) << 32;
242 *llp |= (uint32_t) t2;
246 if (xdrs->x_op == XDR_FREE)
256 * same as xdr_hyper - open coded to save a proc call!
259 xdr_u_hyper (XDR *xdrs, u_quad_t *ullp)
263 if (xdrs->x_op == XDR_ENCODE)
265 t1 = (unsigned long) ((*ullp) >> 32);
266 t2 = (unsigned long) (*ullp);
267 return (XDR_PUTLONG(xdrs, &t1) && XDR_PUTLONG(xdrs, &t2));
270 if (xdrs->x_op == XDR_DECODE)
272 if (!XDR_GETLONG(xdrs, &t1) || !XDR_GETLONG(xdrs, &t2))
274 *ullp = ((u_quad_t) t1) << 32;
275 *ullp |= (uint32_t) t2;
279 if (xdrs->x_op == XDR_FREE)
287 xdr_longlong_t (XDR *xdrs, quad_t *llp)
289 return INTUSE(xdr_hyper) (xdrs, llp);
293 xdr_u_longlong_t (XDR *xdrs, u_quad_t *ullp)
295 return INTUSE(xdr_u_hyper) (xdrs, ullp);
302 xdr_short (XDR *xdrs, short *sp)
310 return XDR_PUTLONG (xdrs, &l);
313 if (!XDR_GETLONG (xdrs, &l))
328 * XDR unsigned short integers
331 xdr_u_short (XDR *xdrs, u_short *usp)
339 return XDR_PUTLONG (xdrs, &l);
342 if (!XDR_GETLONG (xdrs, &l))
346 *usp = (u_short) (u_long) l;
361 xdr_char (XDR *xdrs, char *cp)
366 if (!INTUSE(xdr_int) (xdrs, &i))
375 * XDR an unsigned char
378 xdr_u_char (XDR *xdrs, u_char *cp)
383 if (!INTUSE(xdr_u_int) (xdrs, &u))
395 xdr_bool (XDR *xdrs, bool_t *bp)
402 lb = *bp ? XDR_TRUE : XDR_FALSE;
403 return XDR_PUTLONG (xdrs, &lb);
406 if (!XDR_GETLONG (xdrs, &lb))
410 *bp = (lb == XDR_FALSE) ? FALSE : TRUE;
424 xdr_enum (XDR *xdrs, enum_t *ep)
429 }; /* used to find the size of an enum */
432 * enums are treated as ints
434 if (sizeof (enum sizecheck) == 4)
436 #if INT_MAX < LONG_MAX
443 return XDR_PUTLONG (xdrs, &l);
446 if (!XDR_GETLONG (xdrs, &l))
457 return INTUSE(xdr_long) (xdrs, (long *) ep);
460 else if (sizeof (enum sizecheck) == sizeof (short))
462 return INTUSE(xdr_short) (xdrs, (short *) ep);
473 * Allows the specification of a fixed size sequence of opaque bytes.
474 * cp points to the opaque object and cnt gives the byte length.
477 xdr_opaque (XDR *xdrs, caddr_t cp, u_int cnt)
480 static char crud[BYTES_PER_XDR_UNIT];
483 * if no data we are done
489 * round byte count to full xdr units
491 rndup = cnt % BYTES_PER_XDR_UNIT;
493 rndup = BYTES_PER_XDR_UNIT - rndup;
498 if (!XDR_GETBYTES (xdrs, cp, cnt))
504 return XDR_GETBYTES (xdrs, (caddr_t)crud, rndup);
507 if (!XDR_PUTBYTES (xdrs, cp, cnt))
513 return XDR_PUTBYTES (xdrs, xdr_zero, rndup);
524 * *cpp is a pointer to the bytes, *sizep is the count.
525 * If *cpp is NULL maxsize bytes are allocated
528 xdr_bytes (xdrs, cpp, sizep, maxsize)
534 char *sp = *cpp; /* sp is the actual string pointer */
538 * first deal with the length since xdr bytes are counted
540 if (!INTUSE(xdr_u_int) (xdrs, sizep))
545 if ((nodesize > maxsize) && (xdrs->x_op != XDR_FREE))
551 * now deal with the actual bytes
562 *cpp = sp = (char *) mem_alloc (nodesize);
566 (void) __fxprintf (NULL, "%s: %s", __func__, _("out of memory\n"));
572 return INTUSE(xdr_opaque) (xdrs, sp, nodesize);
577 mem_free (sp, nodesize);
587 * Implemented here due to commonality of the object.
590 xdr_netobj (xdrs, np)
595 return INTUSE(xdr_bytes) (xdrs, &np->n_bytes, &np->n_len, MAX_NETOBJ_SZ);
600 * XDR a discriminated union
601 * Support routine for discriminated unions.
602 * You create an array of xdrdiscrim structures, terminated with
603 * an entry with a null procedure pointer. The routine gets
604 * the discriminant value and then searches the array of xdrdiscrims
605 * looking for that value. It calls the procedure given in the xdrdiscrim
606 * to handle the discriminant. If there is no specific routine a default
607 * routine may be called.
608 * If there is no specific or default routine an error is returned.
611 xdr_union (xdrs, dscmp, unp, choices, dfault)
613 enum_t *dscmp; /* enum to decide which arm to work on */
614 char *unp; /* the union itself */
615 const struct xdr_discrim *choices; /* [value, xdr proc] for each arm */
616 xdrproc_t dfault; /* default xdr routine */
621 * we deal with the discriminator; it's an enum
623 if (!INTUSE(xdr_enum) (xdrs, dscmp))
630 * search choices for a value that matches the discriminator.
631 * if we find one, execute the xdr routine for that value.
633 for (; choices->proc != NULL_xdrproc_t; choices++)
635 if (choices->value == dscm)
636 return (*(choices->proc)) (xdrs, unp, LASTUNSIGNED);
640 * no match - execute the default xdr routine if there is one
642 return ((dfault == NULL_xdrproc_t) ? FALSE :
643 (*dfault) (xdrs, unp, LASTUNSIGNED));
649 * Non-portable xdr primitives.
650 * Care should be taken when moving these routines to new architectures.
655 * XDR null terminated ASCII strings
656 * xdr_string deals with "C strings" - arrays of bytes that are
657 * terminated by a NULL character. The parameter cpp references a
658 * pointer to storage; If the pointer is null, then the necessary
659 * storage is allocated. The last parameter is the max allowed length
660 * of the string as specified by a protocol.
663 xdr_string (xdrs, cpp, maxsize)
668 char *sp = *cpp; /* sp is the actual string pointer */
673 * first deal with the length since xdr strings are counted-strings
680 return TRUE; /* already free */
682 /* fall through... */
691 if (!INTUSE(xdr_u_int) (xdrs, &size))
702 /* This means an overflow. It a bug in the caller which
703 provided a too large maxsize but nevertheless catch it
709 * now deal with the actual bytes
715 *cpp = sp = (char *) mem_alloc (nodesize);
718 (void) __fxprintf (NULL, "%s: %s", __func__, _("out of memory\n"));
725 return INTUSE(xdr_opaque) (xdrs, sp, size);
728 mem_free (sp, nodesize);
737 * Wrapper for xdr_string that can be called directly from
738 * routines like clnt_call
741 xdr_wrapstring (xdrs, cpp)
745 if (INTUSE(xdr_string) (xdrs, cpp, LASTUNSIGNED))