# Copyright (c) 2003-2023 Roumen Petrov, Sofia, Bulgaria
# All rights reserved.
#
# Redistribution and use of this script, with or without modification, is
# permitted provided that the following conditions are met:
#
# 1. Redistributions of this script must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
#
# DESCRIPTION: ensure bourne shell compatibility.
#

# be more bourne compatible (as autoconf do it)
DUALCASE=1; export DUALCASE # for MKS sh
if test -n "${ZSH_VERSION+set}" && (emulate sh) >/dev/null 2>&1; then :
  emulate sh
  NULLCMD=:
  # Pre-4.2 versions of Zsh do word splitting on ${1+"$@"}, which
  # is contrary to our usage.  Disable this feature.
  alias -g '${1+"$@"}'='"$@"'
  setopt NO_GLOB_SUBST
else
  case `(set -o) 2>/dev/null` in #(
  *posix*) :
    set -o posix ;; #(
  *) :
     ;;
  esac
fi


# which compatible shell function
which()
{
	case "$1" in
	*/*)
		case "$1" in
		/*)	which_PATH0="${1%/*}"
			which_PATH="$which_PATH0"
			;;
		.*/*)	which_PATH0="${1%/*}"
			which_PATH="`if cd $which_PATH0 2>/dev/null; then pwd ; fi`"
			;;
		*)	which_PATH0="./${1%/*}"
			which_PATH="`pwd`/${1%/*}"
			;;
		esac
		which_NAME=${1##*/}
		;;
	*)	which_PATH0="$PATH"
		which_PATH="$which_PATH0"
		which_NAME="$1"
		;;
	esac
	which_IFS="$IFS"
	IFS=":"
	for D in $which_PATH "" ; do
		test -z "$D" && continue
		test -x "$D/$which_NAME" || continue

		IFS="$which_IFS"
		echo "$D/$which_NAME"
		return 0
	done
	IFS="$which_IFS"
	echo "which: no $which_NAME in ($which_PATH0)" >&2
	return 1
}
