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, 65 insertions, 0 deletions

diff --git a/lib/libelf/elf_shnum.c b/lib/libelf/elf_shnum.c
new file mode 100644
index 00000000000..755062275ba
--- /dev/null
+++ b/lib/libelf/elf_shnum.c
@@ -0,0 +1,65 @@
+/*-
+ * 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 <libelf.h>
+
+#include "_libelf.h"
+
+ELFTC_VCSID("$Id: elf_shnum.c,v 1.1 2019/02/01 05:27:37 jsg Exp $");
+
+static int
+_libelf_getshdrnum(Elf *e, size_t *shnum)
+{
+	void *eh;
+	int ec;
+
+	if (e == NULL || e->e_kind != ELF_K_ELF ||
+	    ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
+		LIBELF_SET_ERROR(ARGUMENT, 0);
+		return (-1);
+	}
+
+	if ((eh = _libelf_ehdr(e, ec, 0)) == NULL)
+		return (-1);
+
+	*shnum = e->e_u.e_elf.e_nscn;
+
+	return (0);
+}
+
+int
+elf_getshdrnum(Elf *e, size_t *shnum)
+{
+	return (_libelf_getshdrnum(e, shnum));
+}
+
+/* Deprecated API. */
+int
+elf_getshnum(Elf *e, size_t *shnum)
+{
+	return (_libelf_getshdrnum(e, shnum) >= 0);
+}