Annotation of src/lib/libc/rpc/xdr_reference.c, Revision 1.1
1.1 ! cgd 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:
! 30: #if defined(LIBC_SCCS) && !defined(lint)
! 31: /*static char *sccsid = "from: @(#)xdr_reference.c 1.11 87/08/11 SMI";*/
! 32: /*static char *sccsid = "from: @(#)xdr_reference.c 2.1 88/07/29 4.0 RPCSRC";*/
! 33: static char *rcsid = "$Id: xdr_reference.c,v 1.3 1993/08/26 00:53:53 jtc Exp $";
! 34: #endif
! 35:
! 36: /*
! 37: * xdr_reference.c, Generic XDR routines impelmentation.
! 38: *
! 39: * Copyright (C) 1987, Sun Microsystems, Inc.
! 40: *
! 41: * These are the "non-trivial" xdr primitives used to serialize and de-serialize
! 42: * "pointers". See xdr.h for more info on the interface to xdr.
! 43: */
! 44:
! 45: #include <stdio.h>
! 46: #include <rpc/types.h>
! 47: #include <rpc/xdr.h>
! 48:
! 49: #define LASTUNSIGNED ((u_int)0-1)
! 50:
! 51: /*
! 52: * XDR an indirect pointer
! 53: * xdr_reference is for recursively translating a structure that is
! 54: * referenced by a pointer inside the structure that is currently being
! 55: * translated. pp references a pointer to storage. If *pp is null
! 56: * the necessary storage is allocated.
! 57: * size is the sizeof the referneced structure.
! 58: * proc is the routine to handle the referenced structure.
! 59: */
! 60: bool_t
! 61: xdr_reference(xdrs, pp, size, proc)
! 62: register XDR *xdrs;
! 63: caddr_t *pp; /* the pointer to work on */
! 64: u_int size; /* size of the object pointed to */
! 65: xdrproc_t proc; /* xdr routine to handle the object */
! 66: {
! 67: register caddr_t loc = *pp;
! 68: register bool_t stat;
! 69:
! 70: if (loc == NULL)
! 71: switch (xdrs->x_op) {
! 72: case XDR_FREE:
! 73: return (TRUE);
! 74:
! 75: case XDR_DECODE:
! 76: *pp = loc = (caddr_t) mem_alloc(size);
! 77: if (loc == NULL) {
! 78: (void) fprintf(stderr,
! 79: "xdr_reference: out of memory\n");
! 80: return (FALSE);
! 81: }
! 82: bzero(loc, (int)size);
! 83: break;
! 84: }
! 85:
! 86: stat = (*proc)(xdrs, loc, LASTUNSIGNED);
! 87:
! 88: if (xdrs->x_op == XDR_FREE) {
! 89: mem_free(loc, size);
! 90: *pp = NULL;
! 91: }
! 92: return (stat);
! 93: }
! 94:
! 95:
! 96: /*
! 97: * xdr_pointer():
! 98: *
! 99: * XDR a pointer to a possibly recursive data structure. This
! 100: * differs with xdr_reference in that it can serialize/deserialiaze
! 101: * trees correctly.
! 102: *
! 103: * What's sent is actually a union:
! 104: *
! 105: * union object_pointer switch (boolean b) {
! 106: * case TRUE: object_data data;
! 107: * case FALSE: void nothing;
! 108: * }
! 109: *
! 110: * > objpp: Pointer to the pointer to the object.
! 111: * > obj_size: size of the object.
! 112: * > xdr_obj: routine to XDR an object.
! 113: *
! 114: */
! 115: bool_t
! 116: xdr_pointer(xdrs,objpp,obj_size,xdr_obj)
! 117: register XDR *xdrs;
! 118: char **objpp;
! 119: u_int obj_size;
! 120: xdrproc_t xdr_obj;
! 121: {
! 122:
! 123: bool_t more_data;
! 124:
! 125: more_data = (*objpp != NULL);
! 126: if (! xdr_bool(xdrs,&more_data)) {
! 127: return (FALSE);
! 128: }
! 129: if (! more_data) {
! 130: *objpp = NULL;
! 131: return (TRUE);
! 132: }
! 133: return (xdr_reference(xdrs,objpp,obj_size,xdr_obj));
! 134: }
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