usr/src/lib/libtnf/record.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  *      Copyright (c) 1994, by Sun Microsytems, Inc.
  24  */
  25
  26 #pragma ident   "%Z%%M% %I%     %E% SMI"
  27
  28 #include "libtnf.h"
  29
  30 /*
  31  * Check a record datum
  32  */
  33
  34 void
  35 _tnf_check_record(tnf_datum_t datum)
  36 {
  37         CHECK_DATUM(datum);
  38
  39         /* All records must be tagged */
  40         if (!INFO_TAGGED(DATUM_INFO(datum)))
  41                 _tnf_error(DATUM_TNF(datum), TNF_ERR_TYPEMISMATCH);
  42 }
  43
  44 /*
  45  * Retrieve the tag arg, encoded in low 16 bits of tag word
  46  */
  47
  48 tnf_datum_t
  49 tnf_get_tag_arg(tnf_datum_t datum)
  50 {
  51         TNF             *tnf;
  52         tnf_ref32_t     *arg;
  53
  54         CHECK_RECORD(datum);
  55
  56         tnf = DATUM_TNF(datum);
  57
  58         /* Should not give an error if not found */
  59         /* LINTED pointer cast may result in improper alignment */
  60         arg = _tnf_get_tag_arg(tnf, DATUM_RECORD(datum));
  61
  62         if (arg == TNF_NULL)
  63                 return (TNF_DATUM_NULL);
  64         else                    /* repackage the tag arg with its taginfo */
  65                 return (RECORD_DATUM(tnf, arg));
  66 }