Squashed 'third_party/elfutils/' content from commit 555e15e
Change-Id: I61cde98949e47e5c8c09c33260de17f30921be79
git-subtree-dir: third_party/elfutils
git-subtree-split: 555e15ebe8bf1eb33d00747173cfc80cc65648a4
diff --git a/libelf/elf_next.c b/libelf/elf_next.c
new file mode 100644
index 0000000..6edafd2
--- /dev/null
+++ b/libelf/elf_next.c
@@ -0,0 +1,72 @@
+/* Advance in archive to next element.
+ Copyright (C) 1998-2009, 2015 Red Hat, Inc.
+ This file is part of elfutils.
+ Contributed by Ulrich Drepper <drepper@redhat.com>, 1998.
+
+ This file is free software; you can redistribute it and/or modify
+ it under the terms of either
+
+ * the GNU Lesser General Public License as published by the Free
+ Software Foundation; either version 3 of the License, or (at
+ your option) any later version
+
+ or
+
+ * the GNU General Public License as published by the Free
+ Software Foundation; either version 2 of the License, or (at
+ your option) any later version
+
+ or both in parallel, as here.
+
+ elfutils is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received copies of the GNU General Public License and
+ the GNU Lesser General Public License along with this program. If
+ not, see <http://www.gnu.org/licenses/>. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <assert.h>
+#include <libelf.h>
+#include <stddef.h>
+
+#include "libelfP.h"
+
+
+Elf_Cmd
+elf_next (Elf *elf)
+{
+ Elf *parent;
+ Elf_Cmd ret;
+
+ /* Be gratious, the specs demand it. */
+ if (elf == NULL || elf->parent == NULL)
+ return ELF_C_NULL;
+
+ /* We can be sure the parent is an archive. */
+ parent = elf->parent;
+ assert (parent->kind == ELF_K_AR);
+
+ rwlock_wrlock (parent->lock);
+
+ /* Now advance the offset. */
+ parent->state.ar.offset += (sizeof (struct ar_hdr)
+ + ((parent->state.ar.elf_ar_hdr.ar_size + 1)
+ & ~1l));
+
+ /* Get the next archive header. */
+ ret = __libelf_next_arhdr_wrlock (parent) != 0 ? ELF_C_NULL : elf->cmd;
+
+ /* If necessary, mark the archive header as unusable. */
+ if (ret == ELF_C_NULL)
+ parent->state.ar.elf_ar_hdr.ar_name = NULL;
+
+ rwlock_unlock (parent->lock);
+
+ return ret;
+}