mkconfig

#!/bin/sh -
#
# @(#)$Id$
#
# Write out an appropriate "config.h" file.
# This script is invoked automatically from the Makefile.
# Thus, the user does not need to run it manually.
#
# Exit w/ a status of 0 on success.
# Exit w/ a status of 1 on error.
# --
# Jeffrey Allen Neitzel
#

CONFIG_H="config.h"
rm -f $CONFIG_H
trap 'status=$? ; rm -f $CONFIG_H ; exit $status' HUP INT QUIT TERM

#
# This function searches for the pathname of utility and defines
# constant w/ the resulting value.  If utility cannot be found,
# constant is defined as the empty string.
#
# usage: definePathnameConstant constant utility
#
definePathnameConstant()
{
	const="$1" ; util="$2"
	dirlist="/bin /sbin /usr/bin /usr/sbin /usr/libexec /usr/games"
	moderr="	  Modify value in \"$CONFIG_H\" if this is incorrect."
	modout="	/* Modify value if incorrect. */"
	for dir in $dirlist ; do
		if test -f "$dir/$util" -a -x "$dir/$util" ; then
			pname="$dir/$util" ; break
		else
			pname=""
		fi
	done

	#echo "$PATH" >&2
	wpname="`which $util </dev/null 2>/dev/null | grep -v 'not found'`"
	#echo "$wpname" >&2
	if test X"$pname" != X -a \( \
		X"$wpname" = X -o X"$wpname" = X"$pname" \
	\) ; then
		(echo "$PROGNAME: $const == \"$pname\"";echo "$moderr") >&2
		def="#define	$const	\"$pname\"$modout"
	elif test X"$wpname" != X ; then
		(echo "$PROGNAME: $const == \"$wpname\"";echo "$moderr") >&2
		def="#define	$const	\"$wpname\"$modout"
	else
		# This should rarely be true, but it is possible.
		(echo "$PROGNAME: $const == \"\"";echo "$moderr") >&2
		def="#define	$const	\"\"$modout"
	fi

	echo "$def"
}

UNAME_S="`uname -s`"
UNAME_SRM="`uname -srm`"
PROGNAME="`basename $0`"
if test $# -ne 0 ; then echo 'usage: $(SHELL) ./'"$PROGNAME" >&2 ; exit 1 ; fi
if test X"$UNAME_S" = X -o X"$UNAME_SRM" = X ; then
	echo "$PROGNAME: Fatal uname(1) error" >&2 ; exit 1
fi

cat <<EOI >$CONFIG_H
/*
 * osh - an enhanced port of the Sixth Edition (V6) UNIX Thompson shell
 */
/*
 * _XOPEN_SOURCE and/or _BSD_SOURCE should be defined only if needed
 * to avoid compilation errors or warnings for the osh package on a
 * given system.  The systems where these feature test macros are
 * (known to be) needed are defined in the mkconfig script.
 *
 * This includes only Linux and SunOS (Solaris/OpenSolaris)
 * at the present time.
 *
 *	Configured for: $UNAME_SRM
 */

#ifndef	CONFIG_H
#define	CONFIG_H

`definePathnameConstant PATH_LOGIN  login`
`definePathnameConstant PATH_NEWGRP newgrp`

EOI

case "$UNAME_S" in
*BSD|Darwin|DragonFly)
	echo "/* $UNAME_S: No need for _XOPEN_SOURCE or _BSD_SOURCE */" \
		>>$CONFIG_H
	;;
Linux)
	echo '#define	_XOPEN_SOURCE	600'   >>$CONFIG_H
	echo '#define	_BSD_SOURCE'           >>$CONFIG_H
	;;
SunOS)
	( echo '#define	CONFIG_SUNOS' ; echo ) >>$CONFIG_H
	echo '#define	_XOPEN_SOURCE	600'   >>$CONFIG_H
	;;
*)
	#
	# This may or may not cause a compilation error.
	# Simply try it to see if it works or not.
	#
	echo "$PROGNAME: WARNING: Check \"$CONFIG_H\" if compilation fails." >&2
	cat <<EOI >>$CONFIG_H
/*
 * WARNING: $UNAME_SRM: Unknown system
 *
 * Please report this result to the developer if possible.
 */
EOI
	;;
esac

echo                             >>$CONFIG_H
echo '#endif	/* !CONFIG_H */' >>$CONFIG_H