dnl @synopsis AC_ARG_WITH_PATH_STYLE
dnl
dnl _AC_DEFINE(PATH_STYLE) describing the filesys interface. 
dnl The value is numeric, where the basetype is encoded as
dnl 16 = dos/win, 32 = unix, 64 = url/www, 0 = other
dnl
dnl some extra semantics are described in other bits
dnl of the value, especially
dnl 1024  accepts "/" as a dir separator 
dnl 2048  accepts ";" as a path separator
dnl 4096  accepts "," as a path separator
dnl
dnl the macro provides a configure' --with-path-style option
dnl that can be used with descriptive arg names. If not explicitly
dnl given, the $target_os will be checked to provide a sane
dnl default. Additional (lower) bits can be used by the user
dnl for some additional magic, higher bits are reserved for
dnl this macro. 
dnl
dnl the mnemonic "strict" or "also" is used to instruct the code
dnl that additional seperators shall be accepted but converted
dnl to the seperator of the underlying pathstyle system. (or-512)
dnl
dnl example: --with-path-style=win,slash
dnl          to make it accept ";" as pathsep, and
dnl          both "/" and "\" as dirseps.
dnl
 
AC_DEFUN(AC_ARG_WITH_PATH_STYLE,
[
 AC_ARG_WITH(path-style,
[  --with-path-style=[dos,unix,url,also,slash,comma],
[ac_with_path_style="$withval"],
[dnl
  case "$target_os" in
    *djgpp | *mingw32* | *emx*) ac_with_path_style="dos" ;;
    *) case `eval echo $exec_prefix` in
       *:*) ac_with_path_style="url" ;;
       *) ac_with_path_style="posix" ;;
       esac
    ;;
  esac
])
   case ",$ac_with_path_style," in
    *,unx,*|*,unix,*|*,bsd,*|*,posix,*) :
	ac_with_path_style__unx="32" ;;
    *) 	ac_with_path_style__unx="0" ;;
   esac
   case ",$ac_with_path_style," in
    *,dos,*|*,win,*|*,windows,*) :
	ac_with_path_style__dos="16" ;;
    *)  ac_with_path_style__dos="0" ;;
   esac
   case ",$ac_with_path_style," in
    *,web,*|*,url,*|*,www,*) :
	ac_with_path_style__url="64" ;;
    *) 	ac_with_path_style__url="0" ;;
   esac
   case ",$ac_with_path_style," in
    *,mac,*|*,macintosh,*|*,apple,*) :
	ac_with_path_style__mac="128" ;;
    *) 	ac_with_path_style__mac="0" ;;
   esac
   case ",$ac_with_path_style," in
    *,def,*|*,define,*|*,special,*) :
	ac_with_path_style__def="256" ;;
    *) 	ac_with_path_style__def="0" ;;
   esac
   case ",$ac_with_path_style," in
    *,also,*|*,strict,*|*,accept,*|*,convert,*) :
	ac_with_path_style__use="512" ;;
    *) 	ac_with_path_style__use="0" ;;
   esac
   case ",$ac_with_path_style," in
    *,sl,*|*,slash,*|*,forwslash,*|*,slashsep,*) :
	ac_with_path_style__slash="1024" ;;
    *) 	ac_with_path_style__slash="0" ;;
   esac
   case ",$ac_with_path_style," in
    *,sc,*|*,semi,*|*,semisep,*|*,semicolon,*|*,semicolonsep,*) :
	ac_with_path_style__semic="2048" ;;
    *) 	ac_with_path_style__semic="0" ;;
   esac
   case ",$ac_with_path_style," in
    *,cm,*|*,comma,*|*,commasep,*) :
	ac_with_path_style__comma="4096" ;;
    *) 	ac_with_path_style__comma="0" ;;
   esac

   if test "$ac_with_path_style__unx" != "0" ; then
	ac_with_path_style__slash="1024" 
   fi	
   if test "$ac_with_path_style__dos" != "0" ; then
	ac_with_path_style__semic="2048" 
   fi
   if test "$ac_with_path_style__url" != "0" ; then
	ac_with_path_style__slash="1024" 
	ac_with_path_style__semic="2048" 
   fi

   case ",$ac_with_path_style," in
    *,7,*|*,all,*|*,muchmore,*)  
	ac_with_path_style__level="7" ;;
    *,6,*|*,extra,*|*,manymore,*) 
	ac_with_path_style__level="6" ;;
    *,5,*|*,much,*) 
	ac_with_path_style__level="5" ;;
    *,4,*|*,many,*)
	ac_with_path_style__level="4" ;;
    *,3,*|*,plus,*|*,somemore,*) 
	ac_with_path_style__level="3" ;;
    *,2,*|*,more,*)
	ac_with_path_style__level="2" ;;
    *,1,*|*,some,*)
	ac_with_path_style__level="1" ;;
    *)
	ac_with_path_style__level="0" ;;
   esac

   PATH_STYLE=`expr \
	$ac_with_path_style__unx '+' \
	$ac_with_path_style__dos '+' \
	$ac_with_path_style__win '+' \
	$ac_with_path_style__mac '+' \
	$ac_with_path_style__def '+' \
	$ac_with_path_style__use '+' \
	$ac_with_path_style__slash '+' \
	$ac_with_path_style__semic '+' \
	$ac_with_path_style__comma '+' \
        $ac_with_path_style__level `

 AC_DEFINE_UNQUOTED(PATH_STYLE,$PATH_STYLE,
 [ the OS pathstyle, 16=dos 32=unx 64=url 1024=slash 2048=semic 4096=comma ])
])