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# along with this program. If not, see <http://www.gnu.org/licenses/>.

# Please report bugs or propose patches to gary@gnu.org.


## ------ ##
## Usage. ##
## ------ ##

# Evaluate this file near the top of your script to gain access to
# the functions and variables defined here:
#
#   . `echo "$0" | ${SED-sed} 's|[^/]*$||'`/build-aux/funclib.sh
#
# If you need to override any of the default environment variable
# settings, do that before evaluating this file.


## -------------------- ##
## Shell normalisation. ##
## -------------------- ##

# Some shells need a little help to be as Bourne compatible as possible.
# Before doing anything else, make sure all that help has been provided!

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

# NLS nuisances: We save the old values in case they are required later.
_G_user_locale=
_G_safe_locale=
for _G_var in LANG LANGUAGE LC_ALL LC_CTYPE LC_COLLATE LC_MESSAGES
do
  eval "if test set = \"\${$_G_var+set}\"; then
          save_$_G_var=\$$_G_var
          $_G_var=C
	  export $_G_var
	  _G_user_locale=\"$_G_var=\\\$save_\$_G_var; \$_G_user_locale\"
	  _G_safe_locale=\"$_G_var=C; \$_G_safe_locale\"
	fi"
done

# CDPATH.
(unset CDPATH) >/dev/null 2>&1 && unset CDPATH

# Make sure IFS has a sensible default
sp=' '
nl='
'
IFS="$sp	$nl"

# There are apparently some retarded systems that use ';' as a PATH separator!
if test "${PATH_SEPARATOR+set}" != set; then
  PATH_SEPARATOR=:
  (PATH='/bin;/bin'; FPATH=$PATH; sh -c :) >/dev/null 2>&1 && {
    (PATH='/bin:/bin'; FPATH=$PATH; sh -c :) >/dev/null 2>&1 ||
      PATH_SEPARATOR=';'
  }
fi



## ------------------------- ##
## Locate command utilities. ##
## ------------------------- ##


# func_executable_p FILE
# ----------------------
# Check that FILE is an executable regular file.
func_executable_p ()
{
    test -f "$1" && test -x "$1"
}


# func_path_progs PROGS_LIST CHECK_FUNC [PATH]
# --------------------------------------------
# Search for either a program that responds to --version with output
# containing "GNU", or else returned by CHECK_FUNC otherwise, by
# trying all the directories in PATH with each of the elements of
# PROGS_LIST.
#
# CHECK_FUNC should accept the path to a candidate program, and
# set $func_check_prog_result if it truncates its output less than
# $_G_path_prog_max characters.
func_path_progs ()
{
    _G_progs_list=$1
    _G_check_func=$2
    _G_PATH=${3-"$PATH"}

    _G_path_prog_max=0
    _G_path_prog_found=false
    _G_save_IFS=$IFS; IFS=$PATH_SEPARATOR
    for _G_dir in $_G_PATH; do
      IFS=$_G_save_IFS
      test -z "$_G_dir" && _G_dir=.
      for _G_prog_name in $_G_progs_list; do
        for _exeext in '' .EXE; do
          _G_path_prog=$_G_dir/$_G_prog_name$_exeext
          func_executable_p "$_G_path_prog" || continue
          case `"$_G_path_prog" --version 2>&1` in
            *GNU*) func_path_progs_result=$_G_path_prog _G_path_prog_found=: ;;
            *)     $_G_check_func $_G_path_prog
		   func_path_progs_result=$func_check_prog_result
		   ;;
          esac
          $_G_path_prog_found && break 3
        done
      done
    done