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+# opkhelper
+# 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 2 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 "${_OH_COMMON_SM}" ] && return 0
+_OH_COMMON_SM='true'
+
+_OH_STACK_VARS=
+_OH_SAVED_IFS=
+
+_oh_local()
+{
+ # Push the variable list onto the stack.
+ _OH_STACK_VARS="${_OH_STACK_VARS}|${*}"
+
+ # Save the old IFS value, if any, and set it to its default.
+ _OH_SAVED_IFS="${IFS}"
+ IFS='
+'
+}
+
+_oh_return()
+{
+ # Unset the variables at the top of the stack.
+ IFS=' '
+ unset -v ${_OH_STACK_VARS##*|}
+
+ # Pop the variable list from the top of the stack.
+ _OH_STACK_VARS="${_OH_STACK_VARS%|*}"
+
+ # Restore the saved IFS.
+ IFS="${_OH_SAVED_IFS}"
+
+ return ${1}
+}