auto import from //depot/cupcake/@135843
diff --git a/sh/mkbuiltins b/sh/mkbuiltins
new file mode 100644
index 0000000..5b19269
--- /dev/null
+++ b/sh/mkbuiltins
@@ -0,0 +1,136 @@
+#!/bin/sh -
+# $NetBSD: mkbuiltins,v 1.21 2004/06/06 07:03:11 christos Exp $
+#
+# Copyright (c) 1991, 1993
+# The Regents of the University of California. All rights reserved.
+#
+# This code is derived from software contributed to Berkeley by
+# Kenneth Almquist.
+#
+# 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.
+# 3. Neither the name of the University nor the names of its contributors
+# may be used to endorse or promote products derived from this software
+# without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+#
+# @(#)mkbuiltins 8.2 (Berkeley) 5/4/95
+
+havehist=1
+if [ "X$1" = "X-h" ]; then
+ havehist=0
+ shift
+fi
+
+shell=$1
+builtins=$2
+objdir=$3
+
+havejobs=0
+if grep '^#define JOBS[ ]*1' ${shell} > /dev/null
+then
+ havejobs=1
+fi
+
+exec <$builtins 3> ${objdir}/builtins.c 4> ${objdir}/builtins.h
+
+echo '/*
+ * This file was generated by the mkbuiltins program.
+ */
+
+#include "shell.h"
+#include "builtins.h"
+
+const struct builtincmd builtincmd[] = {
+' >&3
+
+echo '/*
+ * This file was generated by the mkbuiltins program.
+ */
+
+#include <sys/cdefs.h>
+
+struct builtincmd {
+ const char *name;
+ int (*builtin)(int, char **);
+};
+
+extern const struct builtincmd builtincmd[];
+extern const struct builtincmd splbltincmd[];
+
+' >&4
+
+specials=
+
+while read line
+do
+ set -- $line
+ [ -z "$1" ] && continue
+ case "$1" in
+ \#if*|\#def*|\#end*)
+ echo $line >&3
+ echo $line >&4
+ continue
+ ;;
+ esac
+ l1="${line###}"
+ [ "$l1" != "$line" ] && continue
+
+
+ func=$1
+ shift
+ [ x"$1" = x'-j' ] && {
+ [ $havejobs = 0 ] && continue
+ shift
+ }
+ [ x"$1" = x'-h' ] && {
+ [ $havehist = 0 ] && continue
+ shift
+ }
+ echo 'int '"$func"'(int, char **);' >&4
+ while
+ [ $# != 0 -a "$1" != '#' ]
+ do
+ [ "$1" = '-s' ] && {
+ specials="$specials $2 $func"
+ shift 2
+ continue;
+ }
+ [ "$1" = '-u' ] && shift
+ echo ' { "'$1'", '"$func"' },' >&3
+ shift
+ done
+done
+
+echo ' { 0, 0 },' >&3
+echo '};' >&3
+echo >&3
+echo 'const struct builtincmd splbltincmd[] = {' >&3
+
+set -- $specials
+while
+ [ $# != 0 ]
+do
+ echo ' { "'$1'", '"$2"' },' >&3
+ shift 2
+done
+
+echo ' { 0, 0 },' >&3
+echo "};" >&3