1 files changed, 153 insertions, 0 deletions
diff --git a/cddl/contrib/opensolaris/common/ctf/ctf_labels.c b/cddl/contrib/opensolaris/common/ctf/ctf_labels.c
new file mode 100644
index 000000000000..ddcb1d330202
--- /dev/null
+++ b/cddl/contrib/opensolaris/common/ctf/ctf_labels.c
@@ -0,0 +1,153 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License").  You may not use this file except in compliance
+ * with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2002-2003 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#include <ctf_impl.h>
+
+static int
+extract_label_info(ctf_file_t *fp, const ctf_lblent_t **ctl, uint_t *num_labels)
+{
+	const ctf_header_t *h;
+
+	/*
+	 * Labels are only supported in V2 or later
+	 */
+	if (fp->ctf_version < CTF_VERSION_2)
+		return (ctf_set_errno(fp, ECTF_NOTSUP));
+
+	h = (const ctf_header_t *)fp->ctf_data.cts_data;
+
+	/* LINTED - pointer alignment */
+	*ctl = (const ctf_lblent_t *)(fp->ctf_buf + h->cth_lbloff);
+	*num_labels = (h->cth_objtoff - h->cth_lbloff) / sizeof (ctf_lblent_t);
+
+	return (0);
+}
+
+/*
+ * Returns the topmost label, or NULL if any errors are encountered
+ */
+const char *
+ctf_label_topmost(ctf_file_t *fp)
+{
+	const ctf_lblent_t *ctlp;
+	const char *s;
+	uint_t num_labels;
+
+	if (extract_label_info(fp, &ctlp, &num_labels) == CTF_ERR)
+		return (NULL); /* errno is set */
+
+	if (num_labels == 0) {
+		(void) ctf_set_errno(fp, ECTF_NOLABELDATA);
+		return (NULL);
+	}
+
+	if ((s = ctf_strraw(fp, (ctlp + num_labels - 1)->ctl_label)) == NULL)
+		(void) ctf_set_errno(fp, ECTF_CORRUPT);
+
+	return (s);
+}
+
+/*
+ * Iterate over all labels.  We pass the label string and the lblinfo_t struct
+ * to the specified callback function.
+ */
+int
+ctf_label_iter(ctf_file_t *fp, ctf_label_f *func, void *arg)
+{
+	const ctf_lblent_t *ctlp;
+	uint_t i, num_labels;
+	ctf_lblinfo_t linfo;
+	const char *lname;
+	int rc;
+
+	if (extract_label_info(fp, &ctlp, &num_labels) == CTF_ERR)
+		return (CTF_ERR); /* errno is set */
+
+	if (num_labels == 0)
+		return (ctf_set_errno(fp, ECTF_NOLABELDATA));
+
+	for (i = 0; i < num_labels; i++, ctlp++) {
+		if ((lname = ctf_strraw(fp, ctlp->ctl_label)) == NULL) {
+			ctf_dprintf("failed to decode label %u with "
+			    "typeidx %u\n", ctlp->ctl_label, ctlp->ctl_typeidx);
+			return (ctf_set_errno(fp, ECTF_CORRUPT));
+		}
+
+		linfo.ctb_typeidx = ctlp->ctl_typeidx;
+		if ((rc = func(lname, &linfo, arg)) != 0)
+			return (rc);
+	}
+
+	return (0);
+}
+
+typedef struct linfo_cb_arg {
+	const char *lca_name;    /* Label we want to retrieve info for */
+	ctf_lblinfo_t *lca_info; /* Where to store the info about the label */
+} linfo_cb_arg_t;
+
+static int
+label_info_cb(const char *lname, const ctf_lblinfo_t *linfo, void *arg)
+{
+	/*
+	 * If lname matches the label we are looking for, copy the
+	 * lblinfo_t struct for the caller.
+	 */
+	if (strcmp(lname, ((linfo_cb_arg_t *)arg)->lca_name) == 0) {
+		/*
+		 * Allow caller not to allocate storage to test if label exists
+		 */
+		if (((linfo_cb_arg_t *)arg)->lca_info != NULL)
+			bcopy(linfo, ((linfo_cb_arg_t *)arg)->lca_info,
+			    sizeof (ctf_lblinfo_t));
+		return (1); /* Indicate we found a match */
+	}
+
+	return (0);
+}
+
+/*
+ * Retrieve information about the label with name "lname"
+ */
+int
+ctf_label_info(ctf_file_t *fp, const char *lname, ctf_lblinfo_t *linfo)
+{
+	linfo_cb_arg_t cb_arg;
+	int rc;
+
+	cb_arg.lca_name = lname;
+	cb_arg.lca_info = linfo;
+
+	if ((rc = ctf_label_iter(fp, label_info_cb, &cb_arg)) == CTF_ERR)
+		return (rc);
+
+	if (rc != 1)
+		return (ctf_set_errno(fp, ECTF_NOLABEL));
+
+	return (0);
+}