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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_dirname.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_DIRNAME(PATHNAME)
#
# DESCRIPTION
#
# Parts of the implementation have been taken from AS_DIRNAME from the
# main autoconf package in generation 2.5x. However, we do only use "sed"
# to cut out the dirname, and we do additionally clean up some dir/..
# parts in the resulting pattern.
#
# this macro may be used in autoconf 2.13 scripts as well.
#
# LICENSE
#
# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 9
AC_DEFUN([AX_DIRNAME],
[echo X[]$1 |
sed ['s/\/[^\/:][^\/:]*\/..\//\//g
s/\/[^\/:][^\/:]*\/..\//\//g
s/\/[^\/:][^\/:]*\/..\//\//g
s/\/[^\/:][^\/:]*\/..\//\//g
/^X\(.*[^/]\)\/\/*[^/][^/]*\/*$/{ s//\1/; q; }
/^X\(\/\/\)[^/].*/{ s//\1/; q; }
/^X\(\/\/\)$/{ s//\1/; q; }
/^X\(\/\).*/{ s//\1/; q; }
s/.*/./; q']])
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