File: st_save_restore_var.m4

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strace 6.18%2Bds-1
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#!/usr/bin/m4
#
# Copyright (c) 2016-2018 The strace developers.
# All rights reserved.
#
# SPDX-License-Identifier: LGPL-2.1-or-later

AC_DEFUN([st_SAVE_VAR], [dnl
AS_IF([test -n "${$1+set}"], [st_saved_$1="${$1}"; unset $1])
])

AC_DEFUN([st_RESTORE_VAR], [dnl
AS_IF([test -n "${st_saved_$1+set}"], [$1="${st_saved_$1}"; unset st_saved_$1])
])