add libelf from elftoolchain r3669

A 2 clause BSD licensed implementation of the SVR4 ELF API also
implemented by mr511.de libelf (devel/libelf in ports) and elfutils.

It is being added to base to allow Mesa to use it in future.

shlib major is higher than devel/libelf and pkg-config version is 0.8.2
to pass a glib2 configure test so this can replace the use of
devel/libelf in ports.

1 files changed, 64 insertions, 0 deletions

diff --git a/lib/libelf/elf_next.c b/lib/libelf/elf_next.c
new file mode 100644
index 00000000000..74f9b9975cf
--- /dev/null
+++ b/lib/libelf/elf_next.c
@@ -0,0 +1,64 @@
+/*-
+ * Copyright (c) 2006,2008 Joseph Koshy
+ * 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.
+ */
+
+#include <ar.h>
+#include <assert.h>
+#include <libelf.h>
+
+#include "_libelf.h"
+
+ELFTC_VCSID("$Id: elf_next.c,v 1.1 2019/02/01 05:27:37 jsg Exp $");
+
+Elf_Cmd
+elf_next(Elf *e)
+{
+	off_t next;
+	Elf *parent;
+
+	if (e == NULL)
+		return (ELF_C_NULL);
+
+	 if ((parent = e->e_parent) == NULL) {
+		 LIBELF_SET_ERROR(ARGUMENT, 0);
+		 return (ELF_C_NULL);
+	 }
+
+	assert(parent->e_kind == ELF_K_AR);
+	assert(parent->e_cmd == ELF_C_READ);
+	assert(e->e_rawfile > parent->e_rawfile);
+
+	next = e->e_rawfile - parent->e_rawfile + (off_t) e->e_rawsize;
+	next = (next + 1) & ~1;	/* round up to an even boundary */
+
+	/*
+	 * Setup the 'e_next' field of the archive descriptor for the
+	 * next call to 'elf_begin()'.
+	 */
+	parent->e_u.e_ar.e_next = (next >= (off_t) parent->e_rawsize) ?
+	    (off_t) 0 : next;
+
+	return (ELF_C_READ);
+}