xdr_ref.c
上传用户:nvosite88
上传日期:2007-01-17
资源大小:4983k
文件大小:3k
- /* xdr_ref.c - XDR primitives for pointers */
- /* Copyright 1984-2001 Wind River Systems, Inc. */
- #include "copyright_wrs.h"
- /*
- modification history
- --------------------
- 01j,05nov01,vvv fixed compilation warnings
- 01i,18apr00,ham fixed compilation warnings.
- 01h,26may92,rrr the tree shuffle
- 01g,04oct91,rrr passed through the ansification filter
- -changed includes to have absolute path from h/
- -changed copyright notice
- 01f,26jun90,hjb removed sccsid[].
- 01e,11may90,yao added include file memLib.h.
- 01d,05apr88,gae changed fprintf() to printErr().
- 01c,11nov87,jlf added wrs copyright, title, mod history, etc.
- changed name from xdr_reference.c to xdr_ref.c, to
- work under sys-V.
- 01b,06nov87,dnw changed conditionals on KERNEL to DONT_PRINT_ERRORS.
- 01a,01nov87,rdc first VxWorks version
- */
- /*
- * xdr_reference.c, Generic XDR routines impelmentation.
- *
- * Copyright (c) 1987 Wind River Systems, Inc.
- * Copyright (C) 1984, Sun Microsystems, Inc.
- *
- * 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.
- */
- #ifndef lint
- /* static char sccsid[] = "@(#)xdr_reference.c 1.1 86/09/24 Copyr 1984 Sun Micro"; */
- #endif
- #include "vxWorks.h"
- #include "memLib.h"
- #include "rpc/rpctypes.h"
- #include "rpc/xdr.h"
- #include "stdio.h"
- #include "stdlib.h"
- #include "string.h"
- #define LASTUNSIGNED ((u_int)0-1)
- /*
- * 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 referneced structure.
- * proc is the routine to handle the referenced structure.
- */
- bool_t
- xdr_reference(xdrs, pp, size, proc)
- register 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 */
- {
- register caddr_t loc = *pp;
- register 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) {
- printErr ("xdr_reference: out of memoryn");
- return (FALSE);
- }
- bzero ((char *)loc, (int)size);
- break;
- default: /* XDR_ENCODE */
- break;
- }
- stat = (*proc)(xdrs, loc, LASTUNSIGNED);
- 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(xdrs,objpp,obj_size,xdr_obj)
- register 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));
- }