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#ifdef HAVE_NBTOOL_CONFIG_H
23#include "nbtool_config.h"
24#endif
25/*
26 * Copyright 2002-2003 Sun Microsystems, Inc.  All rights reserved.
27 * Use is subject to license terms.
28 */
29
30#pragma ident	"%Z%%M%	%I%	%E% SMI"
31
32#include <ctf_impl.h>
33
34static int
35extract_label_info(ctf_file_t *fp, const ctf_lblent_t **ctl, uint_t *num_labels)
36{
37	const ctf_header_t *h;
38
39	/*
40	 * Labels are only supported in V2 or later
41	 */
42	if (fp->ctf_version < CTF_VERSION_2)
43		return (ctf_set_errno(fp, ECTF_NOTSUP));
44
45	h = (const ctf_header_t *)fp->ctf_data.cts_data;
46
47	/* LINTED - pointer alignment */
48	*ctl = (const ctf_lblent_t *)(fp->ctf_buf + h->cth_lbloff);
49	*num_labels = (h->cth_objtoff - h->cth_lbloff) / sizeof (ctf_lblent_t);
50
51	return (0);
52}
53
54/*
55 * Returns the topmost label, or NULL if any errors are encountered
56 */
57const char *
58ctf_label_topmost(ctf_file_t *fp)
59{
60	const ctf_lblent_t *ctlp = NULL;	// XXX: gcc
61	const char *s;
62	uint_t num_labels = 0;			// XXX: gcc
63
64	if (extract_label_info(fp, &ctlp, &num_labels) == CTF_ERR)
65		return (NULL); /* errno is set */
66
67	if (num_labels == 0) {
68		(void) ctf_set_errno(fp, ECTF_NOLABELDATA);
69		return (NULL);
70	}
71
72	if ((s = ctf_strraw(fp, (ctlp + num_labels - 1)->ctl_label)) == NULL)
73		(void) ctf_set_errno(fp, ECTF_CORRUPT);
74
75	return (s);
76}
77
78/*
79 * Iterate over all labels.  We pass the label string and the lblinfo_t struct
80 * to the specified callback function.
81 */
82int
83ctf_label_iter(ctf_file_t *fp, ctf_label_f *func, void *arg)
84{
85	const ctf_lblent_t *ctlp = NULL;	// XXX: gcc
86	uint_t i, num_labels = 0;		// XXX: gcc
87	ctf_lblinfo_t linfo;
88	const char *lname;
89	int rc;
90
91	if (extract_label_info(fp, &ctlp, &num_labels) == CTF_ERR)
92		return (CTF_ERR); /* errno is set */
93
94	if (num_labels == 0)
95		return (ctf_set_errno(fp, ECTF_NOLABELDATA));
96
97	for (i = 0; i < num_labels; i++, ctlp++) {
98		if ((lname = ctf_strraw(fp, ctlp->ctl_label)) == NULL) {
99			ctf_dprintf("failed to decode label %u with "
100			    "typeidx %u\n", ctlp->ctl_label, ctlp->ctl_typeidx);
101			return (ctf_set_errno(fp, ECTF_CORRUPT));
102		}
103
104		linfo.ctb_typeidx = ctlp->ctl_typeidx;
105		if ((rc = func(lname, &linfo, arg)) != 0)
106			return (rc);
107	}
108
109	return (0);
110}
111
112typedef struct linfo_cb_arg {
113	const char *lca_name;    /* Label we want to retrieve info for */
114	ctf_lblinfo_t *lca_info; /* Where to store the info about the label */
115} linfo_cb_arg_t;
116
117static int
118label_info_cb(const char *lname, const ctf_lblinfo_t *linfo, void *arg)
119{
120	/*
121	 * If lname matches the label we are looking for, copy the
122	 * lblinfo_t struct for the caller.
123	 */
124	if (strcmp(lname, ((linfo_cb_arg_t *)arg)->lca_name) == 0) {
125		/*
126		 * Allow caller not to allocate storage to test if label exists
127		 */
128		if (((linfo_cb_arg_t *)arg)->lca_info != NULL)
129			bcopy(linfo, ((linfo_cb_arg_t *)arg)->lca_info,
130			    sizeof (ctf_lblinfo_t));
131		return (1); /* Indicate we found a match */
132	}
133
134	return (0);
135}
136
137/*
138 * Retrieve information about the label with name "lname"
139 */
140int
141ctf_label_info(ctf_file_t *fp, const char *lname, ctf_lblinfo_t *linfo)
142{
143	linfo_cb_arg_t cb_arg;
144	int rc;
145
146	cb_arg.lca_name = lname;
147	cb_arg.lca_info = linfo;
148
149	if ((rc = ctf_label_iter(fp, label_info_cb, &cb_arg)) == CTF_ERR)
150		return (rc);
151
152	if (rc != 1)
153		return (ctf_set_errno(fp, ECTF_NOLABEL));
154
155	return (0);
156}
157