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Diffstat (limited to 'lib/libc/xdr/xdr_reference.c')
| -rw-r--r-- | lib/libc/xdr/xdr_reference.c | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/lib/libc/xdr/xdr_reference.c b/lib/libc/xdr/xdr_reference.c new file mode 100644 index 000000000000..e3698a35acd9 --- /dev/null +++ b/lib/libc/xdr/xdr_reference.c @@ -0,0 +1,136 @@ +/* $NetBSD: xdr_reference.c,v 1.13 2000/01/22 22:19:18 mycroft Exp $ */ + +/*- + * SPDX-License-Identifier: BSD-3-Clause + * + * Copyright (c) 2010, Oracle America, Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following + * disclaimer in the documentation and/or other materials + * provided with the distribution. + * * Neither the name of the "Oracle America, Inc." nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE + * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, + * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +/* + * xdr_reference.c, Generic XDR routines implementation. + * + * These are the "non-trivial" xdr primitives used to serialize and de-serialize + * "pointers". See xdr.h for more info on the interface to xdr. + */ + +#include "namespace.h" +#include <err.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include <rpc/types.h> +#include <rpc/xdr.h> +#include "libc_private.h" + +/* + * XDR an indirect pointer + * xdr_reference is for recursively translating a structure that is + * referenced by a pointer inside the structure that is currently being + * translated. pp references a pointer to storage. If *pp is null + * the necessary storage is allocated. + * size is the sizeof the referenced structure. + * proc is the routine to handle the referenced structure. + */ +bool_t +xdr_reference(XDR *xdrs, caddr_t *pp, u_int size, xdrproc_t proc) +/* + * XDR *xdrs; + * caddr_t *pp; // the pointer to work on + * u_int size; // size of the object pointed to + * xdrproc_t proc; // xdr routine to handle the object + */ +{ + caddr_t loc = *pp; + bool_t stat; + + if (loc == NULL) + switch (xdrs->x_op) { + case XDR_FREE: + return (TRUE); + + case XDR_DECODE: + *pp = loc = (caddr_t) mem_alloc(size); + if (loc == NULL) { + warnx("xdr_reference: out of memory"); + return (FALSE); + } + memset(loc, 0, size); + break; + + case XDR_ENCODE: + break; + } + + stat = (*proc)(xdrs, loc); + + if (xdrs->x_op == XDR_FREE) { + mem_free(loc, size); + *pp = NULL; + } + return (stat); +} + + +/* + * xdr_pointer(): + * + * XDR a pointer to a possibly recursive data structure. This + * differs with xdr_reference in that it can serialize/deserialiaze + * trees correctly. + * + * What's sent is actually a union: + * + * union object_pointer switch (boolean b) { + * case TRUE: object_data data; + * case FALSE: void nothing; + * } + * + * > objpp: Pointer to the pointer to the object. + * > obj_size: size of the object. + * > xdr_obj: routine to XDR an object. + * + */ +bool_t +xdr_pointer(XDR *xdrs, char **objpp, u_int obj_size, xdrproc_t xdr_obj) +{ + + bool_t more_data; + + more_data = (*objpp != NULL); + if (! xdr_bool(xdrs,&more_data)) { + return (FALSE); + } + if (! more_data) { + *objpp = NULL; + return (TRUE); + } + return (xdr_reference(xdrs,objpp,obj_size,xdr_obj)); +} |