Add a BSD licensed DWARF library for use by the DTrace clients.

The API for this library is deliberately different to the GPL'd
libdwarf to avoid licensing problems.

1 files changed, 68 insertions, 0 deletions

diff --git a/lib/libdwarf/dwarf_cu.c b/lib/libdwarf/dwarf_cu.c
new file mode 100644
index 0000000..325ffdc
--- /dev/null
+++ b/lib/libdwarf/dwarf_cu.c
@@ -0,0 +1,68 @@
+/*-
+ * Copyright (c) 2007 John Birrell (jb@freebsd.org)
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include "_libdwarf.h"
+
+int
+dwarf_next_cu_header(Dwarf_Debug dbg, Dwarf_Unsigned *cu_header_length,
+    Dwarf_Half *cu_version, Dwarf_Unsigned *cu_abbrev_offset,
+    Dwarf_Half *cu_pointer_size, Dwarf_Unsigned *cu_next_offset, Dwarf_Error *error)
+{
+	Dwarf_CU next;
+
+	if (error == NULL)
+		return DWARF_E_ERROR;
+
+	if (dbg == NULL || cu_header_length == NULL || cu_version == NULL ||
+	    cu_abbrev_offset == NULL || cu_pointer_size == NULL ||
+	    cu_next_offset == NULL) {
+		DWARF_SET_ERROR(error, DWARF_E_ARGUMENT);
+		return DWARF_E_ERROR;
+	}
+
+	if (dbg->dbg_cu_current == NULL)
+		dbg->dbg_cu_current = STAILQ_FIRST(&dbg->dbg_cu);
+	else if ((next = STAILQ_NEXT(dbg->dbg_cu_current, cu_next)) == NULL) {
+		DWARF_SET_ERROR(error, DWARF_E_NO_ENTRY);
+		return DWARF_E_NO_ENTRY;
+	} else
+		dbg->dbg_cu_current = next;
+
+	if (dbg->dbg_cu_current == NULL) {
+		DWARF_SET_ERROR(error, DWARF_E_NO_ENTRY);
+		return DWARF_E_NO_ENTRY;
+	}
+
+	*cu_header_length	= dbg->dbg_cu_current->cu_header_length;
+	*cu_version 		= dbg->dbg_cu_current->cu_version;
+	*cu_abbrev_offset	= dbg->dbg_cu_current->cu_abbrev_offset;
+	*cu_pointer_size	= dbg->dbg_cu_current->cu_pointer_size;
+	*cu_next_offset		= dbg->dbg_cu_current->cu_next_offset;
+
+	return DWARF_E_NONE;
+}