#!/bin/sh

KERNELDIR=/usr/src/linux

PATCHLEVEL=`head -3 $KERNELDIR/Makefile | grep PATCHLEVEL | awk '{print $3}'`
KERNFIRST=false

dodiff() {
  if $KERNFIRST ; then
    diff -u $2 $1
  else
    diff -u $1 $2
  fi
}

#
# Print usage and exit
#
usage() {
	cat<<EOM

	stddiff is used for generating diffs of the cvs-tree
		versus the kernel-tree.

	stddiff [-r] [-h] [-k DIR] [files ...]

	Options:

	-h      This Text.
	-r      Reverse direction (kernel versus cvs).
	-k DIR  Kerneltree is in DIR instead of /usr/src/linux

	Without any files given, within the whole tree, the "right"
	files are diffed. When any files are given in the commandline,
	only those are diffed.

EOM
	exit
}

#
# Check, if argument is a linux kernel dir
#
checkkernel() {
	if [ -f $1/Makefile ] ; then
		if [ "`grep ^vmlinux: $1/Makefile | grep vmlinux`" != "" ] ; then
			return 0
		fi
	fi
	echo "The given argument does not look like a kernel dir"
	exit 1
}

while getopts :rhk: a ; do
	case $a in
		\?) case $OPTARG in
			k)  echo "-k requires Kernel directory parameter"
					;;
			*)  echo "Unknown option: -$OPTARG"
				echo "Try stddiff -h"
				;;
			esac
			exit 1
			;;
		k)  checkkernel $OPTARG
			KERNELDIR=$OPTARG
			;;
		r)  KERNFIRST=true
			;;
		h)  usage
			;;
	esac
done
shift `expr $OPTIND - 1`

if [ $# != 0 ]; then
	for i in $* ; do
		dodiff $i $KERNELDIR/$i
	done
else
	for i in drivers/isdn/isdn_*.[ch] ; do
		dodiff $i $KERNELDIR/$i
	done
	for i in drivers/isdn/icn/icn.[ch] ; do
		dodiff $i $KERNELDIR/$i
	done
	for i in drivers/isdn/hisax/*.[ch] drivers/isdn/hisax/md5sums.asc ; do
		dodiff $i $KERNELDIR/$i
	done
	for i in drivers/isdn/avmb1/*.[ch] ; do
		dodiff $i $KERNELDIR/$i
	done
	for i in drivers/isdn/sc/*.[ch] ; do
		dodiff $i $KERNELDIR/$i
	done
	for i in drivers/isdn/pcbit/*.[ch] ; do
		dodiff $i $KERNELDIR/$i
	done
	for i in drivers/isdn/act2000/*.[ch] ; do
		dodiff $i $KERNELDIR/$i
	done
	for i in drivers/isdn/isdnloop/*.[ch] ; do
		dodiff $i $KERNELDIR/$i
	done
	for i in drivers/isdn/eicon/*.[ch] ; do
		dodiff $i $KERNELDIR/$i
	done
	for i in include/linux/*.h ; do
		dodiff $i $KERNELDIR/$i
	done
	README=`echo Documentation/isdn/README* | grep -v '.sc'`
	for i in Documentation/isdn/CREDITS $README Documentation/isdn/*.FAQ \
		Documentation/isdn/INTERFACE Documentation/isdn/HiSax*; do
		dodiff $i $KERNELDIR/$i
	done
	for i in drivers/isdn/Config.in ; do
		dodiff $i $KERNELDIR/$i
	done
	for i in drivers/isdn/Makefile drivers/isdn/icn/Makefile \
		drivers/isdn/isdnloop/Makefile \
		drivers/isdn/sc/Makefile \
		drivers/isdn/avmb1/Makefile \
		drivers/isdn/act2000/Makefile \
		drivers/isdn/eicon/Makefile \
		drivers/isdn/hisax/Makefile \
		drivers/isdn/pcbit/Makefile ; do
		if [ -f $i.kernel ] ; then
    		dodiff $i.kernel $KERNELDIR/$i
		else
    		dodiff $i $KERNELDIR/$i
		fi
	done
fi