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# ===========================================================================
# http://autoconf-archive.cryp.to/ax_check_awk_sub.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_CHECK_AWK_SUB([ACTION-IF-SUCCESS],[ACTION-IF-FAILURE])
#
# DESCRIPTION
#
# Check if AWK supports sub() function. If successful execute
# ACTION-IF-SUCCESS otherwise ACTION-IF-FAILURE.
#
# This work is heavily based upon testawk.sh script by Heiner Steven. You
# should find his script (and related works) at
# <http://www.shelldorado.com/articles/awkcompat.html>. Thanks to
# Alessandro Massignan for his suggestions and extensive nawk tests on
# FreeBSD.
#
# LAST MODIFICATION
#
# 2009-04-20
#
# COPYLEFT
#
# Copyright (c) 2009 Francesco Salvestrini <salvestrini@users.sourceforge.net>
#
# 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.
AC_DEFUN([AX_CHECK_AWK_SUB], [
AX_TRY_AWK_EXPOUT([sub()],
[],[ s = "AB"; sub(/./, "X", s); print s ],[XB],
[$1],[$2])
])
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