Bring in a transport-independent RPC (TI-RPC).
[dragonfly.git] / lib / libc / xdr / xdr.c
CommitLineData
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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
1de703da
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28 *
29 * @(#)xdr.c 1.35 87/08/12
30 * @(#)xdr.c 2.1 88/07/29 4.0 RPCSRC
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31 * $NetBSD: xdr.c,v 1.22 2000/07/06 03:10:35 christos Exp $
32 * $FreeBSD: src/lib/libc/xdr/xdr.c,v 1.14 2004/10/16 06:32:43 obrien Exp $
61e06046 33 * $DragonFly: src/lib/libc/xdr/xdr.c,v 1.4 2005/12/05 00:47:57 swildner Exp $
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34 */
35
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36/*
37 * xdr.c, Generic XDR routines implementation.
38 *
39 * Copyright (C) 1986, Sun Microsystems, Inc.
40 *
41 * These are the "generic" xdr routines used to serialize and de-serialize
42 * most common data items. See xdr.h for more info on the interface to
43 * xdr.
44 */
45
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46#include "namespace.h"
47#include <err.h>
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48#include <stdio.h>
49#include <stdlib.h>
50#include <string.h>
51
52#include <rpc/types.h>
53#include <rpc/xdr.h>
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54#include "un-namespace.h"
55
56typedef quad_t longlong_t; /* ANSI long long type */
57typedef u_quad_t u_longlong_t; /* ANSI unsigned long long type */
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58
59/*
60 * constants specific to the xdr "protocol"
61 */
62#define XDR_FALSE ((long) 0)
63#define XDR_TRUE ((long) 1)
64#define LASTUNSIGNED ((u_int) 0-1)
65
66/*
67 * for unit alignment
68 */
ce0e08e2 69static const char xdr_zero[BYTES_PER_XDR_UNIT] = { 0, 0, 0, 0 };
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70
71/*
72 * Free a data structure using XDR
73 * Not a filter, but a convenient utility nonetheless
74 */
75void
ce0e08e2 76xdr_free(xdrproc_t proc, void *objp)
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77{
78 XDR x;
79
80 x.x_op = XDR_FREE;
81 (*proc)(&x, objp);
82}
83
84/*
85 * XDR nothing
86 */
87bool_t
61e06046 88xdr_void(void)
984263bc 89{
ce0e08e2 90
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91 return (TRUE);
92}
93
94
95/*
96 * XDR integers
97 */
98bool_t
61e06046 99xdr_int(XDR *xdrs, int *ip)
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100{
101 long l;
102
103 switch (xdrs->x_op) {
104
105 case XDR_ENCODE:
106 l = (long) *ip;
107 return (XDR_PUTLONG(xdrs, &l));
108
109 case XDR_DECODE:
110 if (!XDR_GETLONG(xdrs, &l)) {
111 return (FALSE);
112 }
113 *ip = (int) l;
114 return (TRUE);
115
116 case XDR_FREE:
117 return (TRUE);
118 }
ce0e08e2 119 /* NOTREACHED */
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120 return (FALSE);
121}
122
123/*
124 * XDR unsigned integers
125 */
126bool_t
61e06046 127xdr_u_int(XDR *xdrs, u_int *up)
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128{
129 u_long l;
130
131 switch (xdrs->x_op) {
132
133 case XDR_ENCODE:
134 l = (u_long) *up;
135 return (XDR_PUTLONG(xdrs, (long *)&l));
136
137 case XDR_DECODE:
138 if (!XDR_GETLONG(xdrs, (long *)&l)) {
139 return (FALSE);
140 }
141 *up = (u_int) l;
142 return (TRUE);
143
144 case XDR_FREE:
145 return (TRUE);
146 }
ce0e08e2 147 /* NOTREACHED */
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148 return (FALSE);
149}
150
151
152/*
153 * XDR long integers
154 * same as xdr_u_long - open coded to save a proc call!
155 */
156bool_t
61e06046 157xdr_long(XDR *xdrs, long *lp)
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158{
159 switch (xdrs->x_op) {
160 case XDR_ENCODE:
161 return (XDR_PUTLONG(xdrs, lp));
162 case XDR_DECODE:
163 return (XDR_GETLONG(xdrs, lp));
164 case XDR_FREE:
165 return (TRUE);
166 }
ce0e08e2 167 /* NOTREACHED */
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168 return (FALSE);
169}
170
171/*
172 * XDR unsigned long integers
173 * same as xdr_long - open coded to save a proc call!
174 */
175bool_t
61e06046 176xdr_u_long(XDR *xdrs, u_long *ulp)
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177{
178 switch (xdrs->x_op) {
179 case XDR_ENCODE:
180 return (XDR_PUTLONG(xdrs, (long *)ulp));
181 case XDR_DECODE:
182 return (XDR_GETLONG(xdrs, (long *)ulp));
183 case XDR_FREE:
184 return (TRUE);
185 }
ce0e08e2 186 /* NOTREACHED */
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187 return (FALSE);
188}
189
190
191/*
192 * XDR 32-bit integers
193 * same as xdr_u_int32_t - open coded to save a proc call!
194 */
195bool_t
61e06046 196xdr_int32_t(XDR *xdrs, int32_t *int32_p)
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197{
198 long l;
199
200 switch (xdrs->x_op) {
201
202 case XDR_ENCODE:
203 l = (long) *int32_p;
204 return (XDR_PUTLONG(xdrs, &l));
205
206 case XDR_DECODE:
207 if (!XDR_GETLONG(xdrs, &l)) {
208 return (FALSE);
209 }
210 *int32_p = (int32_t) l;
211 return (TRUE);
212
213 case XDR_FREE:
214 return (TRUE);
215 }
ce0e08e2 216 /* NOTREACHED */
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217 return (FALSE);
218}
219
220/*
221 * XDR unsigned 32-bit integers
222 * same as xdr_int32_t - open coded to save a proc call!
223 */
224bool_t
61e06046 225xdr_u_int32_t(XDR *xdrs, u_int32_t *u_int32_p)
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226{
227 u_long l;
228
229 switch (xdrs->x_op) {
230
231 case XDR_ENCODE:
232 l = (u_long) *u_int32_p;
233 return (XDR_PUTLONG(xdrs, (long *)&l));
234
235 case XDR_DECODE:
236 if (!XDR_GETLONG(xdrs, (long *)&l)) {
237 return (FALSE);
238 }
239 *u_int32_p = (u_int32_t) l;
240 return (TRUE);
241
242 case XDR_FREE:
243 return (TRUE);
244 }
ce0e08e2 245 /* NOTREACHED */
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246 return (FALSE);
247}
248
249
250/*
251 * XDR short integers
252 */
253bool_t
61e06046 254xdr_short(XDR *xdrs, short *sp)
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255{
256 long l;
257
258 switch (xdrs->x_op) {
259
260 case XDR_ENCODE:
261 l = (long) *sp;
262 return (XDR_PUTLONG(xdrs, &l));
263
264 case XDR_DECODE:
265 if (!XDR_GETLONG(xdrs, &l)) {
266 return (FALSE);
267 }
268 *sp = (short) l;
269 return (TRUE);
270
271 case XDR_FREE:
272 return (TRUE);
273 }
ce0e08e2 274 /* NOTREACHED */
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275 return (FALSE);
276}
277
278/*
279 * XDR unsigned short integers
280 */
281bool_t
61e06046 282xdr_u_short(XDR *xdrs, u_short *usp)
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283{
284 u_long l;
285
286 switch (xdrs->x_op) {
287
288 case XDR_ENCODE:
289 l = (u_long) *usp;
290 return (XDR_PUTLONG(xdrs, (long *)&l));
291
292 case XDR_DECODE:
293 if (!XDR_GETLONG(xdrs, (long *)&l)) {
294 return (FALSE);
295 }
296 *usp = (u_short) l;
297 return (TRUE);
298
299 case XDR_FREE:
300 return (TRUE);
301 }
ce0e08e2 302 /* NOTREACHED */
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303 return (FALSE);
304}
305
306
307/*
308 * XDR 16-bit integers
309 */
310bool_t
61e06046 311xdr_int16_t(XDR *xdrs, int16_t *int16_p)
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312{
313 long l;
314
315 switch (xdrs->x_op) {
316
317 case XDR_ENCODE:
318 l = (long) *int16_p;
319 return (XDR_PUTLONG(xdrs, &l));
320
321 case XDR_DECODE:
322 if (!XDR_GETLONG(xdrs, &l)) {
323 return (FALSE);
324 }
325 *int16_p = (int16_t) l;
326 return (TRUE);
327
328 case XDR_FREE:
329 return (TRUE);
330 }
ce0e08e2 331 /* NOTREACHED */
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332 return (FALSE);
333}
334
335/*
336 * XDR unsigned 16-bit integers
337 */
338bool_t
61e06046 339xdr_u_int16_t(XDR *xdrs, u_int16_t *u_int16_p)
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340{
341 u_long l;
342
343 switch (xdrs->x_op) {
344
345 case XDR_ENCODE:
346 l = (u_long) *u_int16_p;
347 return (XDR_PUTLONG(xdrs, (long *)&l));
348
349 case XDR_DECODE:
350 if (!XDR_GETLONG(xdrs, (long *)&l)) {
351 return (FALSE);
352 }
353 *u_int16_p = (u_int16_t) l;
354 return (TRUE);
355
356 case XDR_FREE:
357 return (TRUE);
358 }
ce0e08e2 359 /* NOTREACHED */
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360 return (FALSE);
361}
362
363
364/*
365 * XDR a char
366 */
367bool_t
61e06046 368xdr_char(XDR *xdrs, char *cp)
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369{
370 int i;
371
372 i = (*cp);
373 if (!xdr_int(xdrs, &i)) {
374 return (FALSE);
375 }
376 *cp = i;
377 return (TRUE);
378}
379
380/*
381 * XDR an unsigned char
382 */
383bool_t
61e06046 384xdr_u_char(XDR *xdrs, u_char *cp)
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385{
386 u_int u;
387
388 u = (*cp);
389 if (!xdr_u_int(xdrs, &u)) {
390 return (FALSE);
391 }
392 *cp = u;
393 return (TRUE);
394}
395
396/*
397 * XDR booleans
398 */
399bool_t
61e06046 400xdr_bool(XDR *xdrs, bool_t *bp)
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401{
402 long lb;
403
404 switch (xdrs->x_op) {
405
406 case XDR_ENCODE:
407 lb = *bp ? XDR_TRUE : XDR_FALSE;
408 return (XDR_PUTLONG(xdrs, &lb));
409
410 case XDR_DECODE:
411 if (!XDR_GETLONG(xdrs, &lb)) {
412 return (FALSE);
413 }
414 *bp = (lb == XDR_FALSE) ? FALSE : TRUE;
415 return (TRUE);
416
417 case XDR_FREE:
418 return (TRUE);
419 }
ce0e08e2 420 /* NOTREACHED */
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421 return (FALSE);
422}
423
424/*
425 * XDR enumerations
426 */
427bool_t
61e06046 428xdr_enum(XDR *xdrs, enum_t *ep)
984263bc 429{
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430 enum sizecheck { SIZEVAL }; /* used to find the size of an enum */
431
432 /*
433 * enums are treated as ints
434 */
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435 /* LINTED */ if (sizeof (enum sizecheck) == sizeof (long)) {
436 return (xdr_long(xdrs, (long *)(void *)ep));
437 } else /* LINTED */ if (sizeof (enum sizecheck) == sizeof (int)) {
438 return (xdr_int(xdrs, (int *)(void *)ep));
439 } else /* LINTED */ if (sizeof (enum sizecheck) == sizeof (short)) {
440 return (xdr_short(xdrs, (short *)(void *)ep));
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441 } else {
442 return (FALSE);
443 }
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444}
445
446/*
447 * XDR opaque data
448 * Allows the specification of a fixed size sequence of opaque bytes.
449 * cp points to the opaque object and cnt gives the byte length.
450 */
451bool_t
61e06046 452xdr_opaque(XDR *xdrs, caddr_t cp, u_int cnt)
984263bc 453{
660c873b 454 u_int rndup;
61e06046 455 static int crud[BYTES_PER_XDR_UNIT];
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456
457 /*
458 * if no data we are done
459 */
460 if (cnt == 0)
461 return (TRUE);
462
463 /*
464 * round byte count to full xdr units
465 */
466 rndup = cnt % BYTES_PER_XDR_UNIT;
467 if (rndup > 0)
468 rndup = BYTES_PER_XDR_UNIT - rndup;
469
470 if (xdrs->x_op == XDR_DECODE) {
471 if (!XDR_GETBYTES(xdrs, cp, cnt)) {
472 return (FALSE);
473 }
474 if (rndup == 0)
475 return (TRUE);
ce0e08e2 476 return (XDR_GETBYTES(xdrs, (caddr_t)(void *)crud, rndup));
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477 }
478
479 if (xdrs->x_op == XDR_ENCODE) {
480 if (!XDR_PUTBYTES(xdrs, cp, cnt)) {
481 return (FALSE);
482 }
483 if (rndup == 0)
484 return (TRUE);
485 return (XDR_PUTBYTES(xdrs, xdr_zero, rndup));
486 }
487
488 if (xdrs->x_op == XDR_FREE) {
489 return (TRUE);
490 }
491
492 return (FALSE);
493}
494
495/*
496 * XDR counted bytes
497 * *cpp is a pointer to the bytes, *sizep is the count.
498 * If *cpp is NULL maxsize bytes are allocated
499 */
500bool_t
61e06046 501xdr_bytes(XDR *xdrs, char **cpp, u_int *sizep, u_int maxsize)
984263bc 502{
660c873b
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503 char *sp = *cpp; /* sp is the actual string pointer */
504 u_int nodesize;
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505
506 /*
507 * first deal with the length since xdr bytes are counted
508 */
509 if (! xdr_u_int(xdrs, sizep)) {
510 return (FALSE);
511 }
512 nodesize = *sizep;
513 if ((nodesize > maxsize) && (xdrs->x_op != XDR_FREE)) {
514 return (FALSE);
515 }
516
517 /*
518 * now deal with the actual bytes
519 */
520 switch (xdrs->x_op) {
521
522 case XDR_DECODE:
523 if (nodesize == 0) {
524 return (TRUE);
525 }
526 if (sp == NULL) {
ce0e08e2 527 *cpp = sp = mem_alloc(nodesize);
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528 }
529 if (sp == NULL) {
ce0e08e2 530 warnx("xdr_bytes: out of memory");
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531 return (FALSE);
532 }
ce0e08e2 533 /* FALLTHROUGH */
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534
535 case XDR_ENCODE:
536 return (xdr_opaque(xdrs, sp, nodesize));
537
538 case XDR_FREE:
539 if (sp != NULL) {
540 mem_free(sp, nodesize);
541 *cpp = NULL;
542 }
543 return (TRUE);
544 }
ce0e08e2 545 /* NOTREACHED */
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546 return (FALSE);
547}
548
549/*
550 * Implemented here due to commonality of the object.
551 */
552bool_t
61e06046 553xdr_netobj(XDR *xdrs, struct netobj *np)
984263bc 554{
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555 return (xdr_bytes(xdrs, &np->n_bytes, &np->n_len, MAX_NETOBJ_SZ));
556}
557
558/*
559 * XDR a descriminated union
560 * Support routine for discriminated unions.
561 * You create an array of xdrdiscrim structures, terminated with
562 * an entry with a null procedure pointer. The routine gets
563 * the discriminant value and then searches the array of xdrdiscrims
564 * looking for that value. It calls the procedure given in the xdrdiscrim
565 * to handle the discriminant. If there is no specific routine a default
566 * routine may be called.
567 * If there is no specific or default routine an error is returned.
61e06046
SW
568 *
569 * Parameters:
570 * dscmp: enum to decide which ar to work on
571 * unp: the union itself
572 * choices: [value, xdr proc] for each arm
573 * dfault: default xdr routine
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574 */
575bool_t
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576xdr_union(XDR *xdrs, enum_t *dscmp, char *unp,
577 const struct xdr_discrim *choices, xdrproc_t dfault)
984263bc 578{
660c873b 579 enum_t dscm;
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580
581 /*
582 * we deal with the discriminator; it's an enum
583 */
584 if (! xdr_enum(xdrs, dscmp)) {
585 return (FALSE);
586 }
587 dscm = *dscmp;
588
589 /*
590 * search choices for a value that matches the discriminator.
591 * if we find one, execute the xdr routine for that value.
592 */
593 for (; choices->proc != NULL_xdrproc_t; choices++) {
594 if (choices->value == dscm)
ce0e08e2 595 return ((*(choices->proc))(xdrs, unp));
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596 }
597
598 /*
599 * no match - execute the default xdr routine if there is one
600 */
601 return ((dfault == NULL_xdrproc_t) ? FALSE :
ce0e08e2 602 (*dfault)(xdrs, unp));
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603}
604
605
606/*
607 * Non-portable xdr primitives.
608 * Care should be taken when moving these routines to new architectures.
609 */
610
611
612/*
613 * XDR null terminated ASCII strings
614 * xdr_string deals with "C strings" - arrays of bytes that are
615 * terminated by a NULL character. The parameter cpp references a
616 * pointer to storage; If the pointer is null, then the necessary
617 * storage is allocated. The last parameter is the max allowed length
618 * of the string as specified by a protocol.
619 */
620bool_t
61e06046 621xdr_string(XDR *xdrs, char **cpp, u_int maxsize)
984263bc 622{
660c873b 623 char *sp = *cpp; /* sp is the actual string pointer */
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624 u_int size;
625 u_int nodesize;
626
627 /*
628 * first deal with the length since xdr strings are counted-strings
629 */
630 switch (xdrs->x_op) {
631 case XDR_FREE:
632 if (sp == NULL) {
633 return(TRUE); /* already free */
634 }
ce0e08e2 635 /* FALLTHROUGH */
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636 case XDR_ENCODE:
637 size = strlen(sp);
638 break;
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639 case XDR_DECODE:
640 break;
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641 }
642 if (! xdr_u_int(xdrs, &size)) {
643 return (FALSE);
644 }
645 if (size > maxsize) {
646 return (FALSE);
647 }
648 nodesize = size + 1;
649
650 /*
651 * now deal with the actual bytes
652 */
653 switch (xdrs->x_op) {
654
655 case XDR_DECODE:
656 if (nodesize == 0) {
657 return (TRUE);
658 }
659 if (sp == NULL)
ce0e08e2 660 *cpp = sp = mem_alloc(nodesize);
984263bc 661 if (sp == NULL) {
ce0e08e2 662 warnx("xdr_string: out of memory");
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663 return (FALSE);
664 }
665 sp[size] = 0;
ce0e08e2 666 /* FALLTHROUGH */
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667
668 case XDR_ENCODE:
669 return (xdr_opaque(xdrs, sp, size));
670
671 case XDR_FREE:
672 mem_free(sp, nodesize);
673 *cpp = NULL;
674 return (TRUE);
675 }
ce0e08e2 676 /* NOTREACHED */
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677 return (FALSE);
678}
679
680/*
681 * Wrapper for xdr_string that can be called directly from
682 * routines like clnt_call
683 */
684bool_t
61e06046 685xdr_wrapstring(XDR *xdrs, char **cpp)
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686{
687 return xdr_string(xdrs, cpp, LASTUNSIGNED);
688}
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PA
689
690/*
691 * NOTE: xdr_hyper(), xdr_u_hyper(), xdr_longlong_t(), and xdr_u_longlong_t()
692 * are in the "non-portable" section because they require that a `long long'
693 * be a 64-bit type.
694 *
695 * --thorpej@netbsd.org, November 30, 1999
696 */
697
698/*
699 * XDR 64-bit integers
700 */
701bool_t
702xdr_int64_t(XDR *xdrs, int64_t *llp)
703{
704 u_long ul[2];
705
706 switch (xdrs->x_op) {
707 case XDR_ENCODE:
708 ul[0] = (u_long)((u_int64_t)*llp >> 32) & 0xffffffff;
709 ul[1] = (u_long)((u_int64_t)*llp) & 0xffffffff;
710 if (XDR_PUTLONG(xdrs, (long *)&ul[0]) == FALSE)
711 return (FALSE);
712 return (XDR_PUTLONG(xdrs, (long *)&ul[1]));
713 case XDR_DECODE:
714 if (XDR_GETLONG(xdrs, (long *)&ul[0]) == FALSE)
715 return (FALSE);
716 if (XDR_GETLONG(xdrs, (long *)&ul[1]) == FALSE)
717 return (FALSE);
718 *llp = (int64_t)
719 (((u_int64_t)ul[0] << 32) | ((u_int64_t)ul[1]));
720 return (TRUE);
721 case XDR_FREE:
722 return (TRUE);
723 }
724 /* NOTREACHED */
725 return (FALSE);
726}
727
728
729/*
730 * XDR unsigned 64-bit integers
731 */
732bool_t
733xdr_u_int64_t(XDR *xdrs, u_int64_t *ullp)
734{
735 u_long ul[2];
736
737 switch (xdrs->x_op) {
738 case XDR_ENCODE:
739 ul[0] = (u_long)(*ullp >> 32) & 0xffffffff;
740 ul[1] = (u_long)(*ullp) & 0xffffffff;
741 if (XDR_PUTLONG(xdrs, (long *)&ul[0]) == FALSE)
742 return (FALSE);
743 return (XDR_PUTLONG(xdrs, (long *)&ul[1]));
744 case XDR_DECODE:
745 if (XDR_GETLONG(xdrs, (long *)&ul[0]) == FALSE)
746 return (FALSE);
747 if (XDR_GETLONG(xdrs, (long *)&ul[1]) == FALSE)
748 return (FALSE);
749 *ullp = (u_int64_t)
750 (((u_int64_t)ul[0] << 32) | ((u_int64_t)ul[1]));
751 return (TRUE);
752 case XDR_FREE:
753 return (TRUE);
754 }
755 /* NOTREACHED */
756 return (FALSE);
757}
758
759
760/*
761 * XDR hypers
762 */
763bool_t
764xdr_hyper(XDR *xdrs, longlong_t *llp)
765{
766
767 /*
768 * Don't bother open-coding this; it's a fair amount of code. Just
769 * call xdr_int64_t().
770 */
771 return (xdr_int64_t(xdrs, (int64_t *)llp));
772}
773
774
775/*
776 * XDR unsigned hypers
777 */
778bool_t
779xdr_u_hyper(XDR *xdrs, u_longlong_t *ullp)
780{
781
782 /*
783 * Don't bother open-coding this; it's a fair amount of code. Just
784 * call xdr_u_int64_t().
785 */
786 return (xdr_u_int64_t(xdrs, (u_int64_t *)ullp));
787}
788
789
790/*
791 * XDR longlong_t's
792 */
793bool_t
794xdr_longlong_t(XDR *xdrs, longlong_t *llp)
795{
796
797 /*
798 * Don't bother open-coding this; it's a fair amount of code. Just
799 * call xdr_int64_t().
800 */
801 return (xdr_int64_t(xdrs, (int64_t *)llp));
802}
803
804
805/*
806 * XDR u_longlong_t's
807 */
808bool_t
809xdr_u_longlong_t(XDR *xdrs, u_longlong_t *ullp)
810{
811
812 /*
813 * Don't bother open-coding this; it's a fair amount of code. Just
814 * call xdr_u_int64_t().
815 */
816 return (xdr_u_int64_t(xdrs, (u_int64_t *)ullp));
817}