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# func_dirname_and_basename file append nondir_replacement
# perform func_basename and func_dirname in a single function
# call:
#   dirname:  Compute the dirname of FILE.  If nonempty,
#             add APPEND to the result, otherwise set result
#             to NONDIR_REPLACEMENT.
#             value returned in "$func_dirname_result"
#   basename: Compute filename of FILE.
#             value retuned in "$func_basename_result"
# Implementation must be kept synchronized with func_dirname
# and func_basename. For efficiency, we do not delegate to
# those functions but instead duplicate the functionality here.
func_dirname_and_basename ()
{
    # Extract subdirectory from the argument.
    func_dirname_result=`$ECHO "${1}" | $SED -e "$dirname"`
    if test "X$func_dirname_result" = "X${1}"; then
      func_dirname_result="${3}"
    else
      func_dirname_result="$func_dirname_result${2}"