#!/bin/sh -
# $NetBSD: makelintstub,v 1.27 2020/05/16 18:31:47 christos Exp $
#
# Copyright (c) 1996, 1997 Christopher G. Demetriou
# All rights reserved.
# 
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. All advertising materials mentioning features or use of this software
#    must display the following acknowledgement:
#          This product includes software developed for the
#          NetBSD Project.  See http://www.NetBSD.org/ for
#          information about NetBSD.
# 4. The name of the author may not be used to endorse or promote products
#    derived from this software without specific prior written permission.
# 
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
# 
# <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>

usage()
{

cat << _EOF 1>&2
Usage: $PROG [-n|-p] [-o filename] [-s syscall.h] object ...
	-n		Create SYSCALL_NOERROR.
	-p		Create PSEUDO_NOERROR.
			(also removes leading "_" on syscall name).
	-o filename	Output to filename.
	-s syscall.h	Header to #include instead of <sys/syscall.h>.

	The CPP environment variable must be set
	to the path to the C preprocessor.
_EOF
	exit 1
}

header()
{

	cat <<- __EOF__
	/*
	 * THIS IS AN AUTOMATICALLY GENERATED FILE.  DO NOT EDIT.
	 * It is generated by $PROG
	 */

	#include <sys/param.h>
	#include <sys/acl.h>
	#include <sys/aio.h>
	#include <sys/time.h>
	#include <sys/mount.h>
	#include <sys/stat.h>
	#include <ufs/ufs/dinode.h>
	#include <ufs/lfs/lfs.h>
	#include <sys/resource.h>
	#include <sys/poll.h>
	#include <sys/uio.h>
	#include <sys/ipc.h>
	#include <sys/idtype.h>
	#include <sys/lwpctl.h>
	#include <sys/mqueue.h>
	#include <sys/msg.h>
	#include <sys/sem.h>
	#include <sys/shm.h>
	#include <sys/spawn.h>
	#include <sys/sched.h>
	#include <sys/timex.h>
	#include <sys/socket.h>
	#include <sys/event.h>
	#include <sys/uuid.h>
	#include <sys/quotactl.h>
	#ifdef __STDC__
	#include <stdarg.h>
	#else
	#include <varargs.h>
	#endif

	__EOF__
}

syscall_stub()
{

	syscalldump="$1"
	syscallname="$2"
	funcname="$3"

    	arglist="$(
    	sed -e 'ta
		:a
		s,^/\* syscall: \"'"$syscallname"'\" ,,
	        tb
		d
		:b
		s, \*/$,,' $syscalldump
	)"

	eval set -f -- "$arglist"

	if [ $# -lt 3 ]; then
		echo syscall $syscallname not found! 1>&2
		exit 1
	fi

	shift			# kill "ret:"
	returntype=$1; shift
	shift			# kill "args:"

	cat <<- __EOF__
	/*ARGSUSED*/
	$returntype
	__EOF__

	# do ANSI C function header
	echo	"#ifdef __STDC__"

	echo "$funcname("
	first=true; i=1
	for arg; do
		if $first; then
			first=false
		else
			echo ", "
		fi
		case "$arg" in
		"...") echo "...";;
		*) echo "$arg arg$i"; i=$(($i + 1));;
		esac
	done
	if $first; then
		echo "void"
	fi
	echo	")"

	# do K&R C function header
	echo	"#else"

	echo "$funcname("
	first=true; i=1
	for arg; do
		if $first; then
			first=false
		else
			echo ", "
		fi
		case "$arg" in
		"...") echo "va_alist";;
		*) echo "arg$i"; i=$(($i + 1));;
		esac
	done
	echo	")"
	i=1
	for arg; do
		case "$arg" in
		"...") echo "	va_dcl";;
		*) echo "	$arg arg$i;"; i=$(($i + 1));;
		esac
	done

	# do function body
	echo	"#endif"

	echo	"{"
	if [ "$returntype" != "void" ]; then
		echo "        return (($returntype)0);"
	fi
	echo	"}"
}

trailer()
{

	cat <<- __EOF__
	/* END */
	__EOF__
}


pflag=false
nflag=false
oarg=""
syscallhdr=/usr/include/sys/syscall.h
syscalldump=/tmp/makelintstub.$$
PROG="$(basename "$0")"

if [ -z "${CPP}" ]; then
	usage
fi

while getopts no:ps: i
do
	case "$i" in
	n)	nflag=true;;
	o)	oarg=$OPTARG;;
	p)	pflag=true;;
	s)	syscallhdr=$OPTARG;;
	*)	usage;;
	esac
done

shift $(expr $OPTIND - 1)

if $pflag && $nflag
then
	echo "$PROG: -n flag and -p flag may not be used together" 1>&2
	usage
fi

if [ -n "$oarg" ]; then
	exec > $oarg
fi

trap "rm -f $syscalldump" 0 1 2 3 15

header

echo "#include \"$syscallhdr\"" | ${CPP} -D_LIBC -C > $syscalldump

for syscall; do
	fnname=${syscall%.S}
	if $pflag; then
		scname=${fnname#_}
	else
		scname=$fnname
	fi
	syscall_stub $syscalldump $scname $fnname
	echo ""
done

trailer

exit 0
