From 579eb66ce74a0823f4e1f76ccba5f15c3497b1e7 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pjm@nac.net>
Date: Sun, 21 Oct 2012 21:56:38 -0400
Subject: Add "common" and "load" library modules.

---
(limited to 'lib')

diff --git a/lib/Makefile.in b/lib/Makefile.in
index 78cdc44..c8d0b07 100644
--- a/lib/Makefile.in
+++ b/lib/Makefile.in
@@ -35,7 +35,7 @@ sed_script = s&@@PACKAGE_NAME@@&$(package_name)&;\
 .SUFFIXES:
 .SUFFIXES: .sh .sm
 
-SRCS = 
+SRCS = load.sh                          common.sh
 OBJS = $(SRCS:.sh=.sm)
 
 distdir = ../$(package_name)-$(package_version)/lib
diff --git a/lib/common.sh b/lib/common.sh
new file mode 100644
index 0000000..14762db
--- /dev/null
+++ b/lib/common.sh
@@ -0,0 +1,50 @@
+# 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 ${1}
+}
diff --git a/lib/load.sh b/lib/load.sh
new file mode 100644
index 0000000..2a71036
--- /dev/null
+++ b/lib/load.sh
@@ -0,0 +1,48 @@
+# opkhelper
+# lib/load
+# Functions for loading library modules.
+#
+# Copyright (C) 2012 Patrick "P. J." McDermott
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+[ -n "${_OH_LOAD_SM}" ] && return 0
+_OH_LOAD_SM='true'
+
+# The "common" module is used by this and all other modules.
+# We have to manually load the "common" module so we can use it in oh_use.
+. '@@LIBOPKHELPER@@/common.sm'
+
+oh_use()
+{
+	_oh_local _ohu_module
+
+	if [ ${#} -eq 1 ]; then
+		_ohu_module="${1}"
+	else
+		_oh_return 125
+		return ${?}
+	fi
+
+	_ohu_module='@@LIBOPKHELPER@@'"/${_ohu_module}.sm"
+	if [ -r "${_ohu_module}" ]; then
+		. "${_ohu_module}"
+	else
+		_oh_return 1
+		return ${?}
+	fi
+
+	_oh_return 0
+	return ${?}
+}
--
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