From a16af0dbaa43957ff4f3e3b33fef73f2e403ff78 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pjm@nac.net>
Date: Sat, 08 Sep 2012 17:39:03 -0400
Subject: Implement _ob_local and _ob_return.

---
diff --git a/lib/common.sh b/lib/common.sh
new file mode 100644
index 0000000..a11d6e4
--- /dev/null
+++ b/lib/common.sh
@@ -0,0 +1,42 @@
+# opkbuild
+# lib/common
+# Functions for stack memory management.
+#
+# Copyright (C) 2012 Patrick "P. J." McDermott
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program 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 a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+[ -n "${_OB_COMMON_SM}" ] && return 0
+_OB_COMMON_SM='true'
+
+_OB_STACK_VARS=
+
+_ob_local()
+{
+	# Push the variable list onto the stack.
+	_OB_STACK_VARS="|${@}"
+}
+
+_ob_return()
+{
+	# Unset the variables at the top of the stack.
+	unset ${_OB_STACK_VARS##*|}
+
+	# Pop the variable list from the top of the stack.
+	_OB_STACK_VARS="${_OB_STACK_VARS%|*}"
+
+	# Print the return value.
+	echo ${1}
+	return 0
+}
--
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