#!/bin/bash

ARGS=$@

MODULE_NAME=windrvr6
LINUX_USB_SUPPORT=yes
USE_KBUILD=no
KERNEL_DIR=""

ac_prev=
for ac_option do

    # If the previous option needs an argument, assign it.
    if test -n "$ac_prev"; then
        eval "$ac_prev=\$ac_option"
        ac_prev=
        continue
    fi

    case "$ac_option" in
        -*=*) ac_optarg=`echo "$ac_option" | sed 's/[-_a-zA-Z0-9]*=//'` ;;
        *) ac_optarg= ;;
    esac

    case $ac_option in
        --disable-usb-support)
            LINUX_USB_SUPPORT=no ;;
        --enable-usb-support=no)
            LINUX_USB_SUPPORT=no ;;
	--with-kernel-source)
	    ac_prev=$ac_option ;;
	--with-kernel-source=*)
	    KERNEL_DIR=$ac_optarg ;;
	--enable-kbuild)
	    USE_KBUILD=yes ;;
    esac
done

VER=`uname -r`
VER_BASE=`echo $VER | cut -c 1-3`
VER_SUBMINOR=`echo $VER | cut -f 3 -d "." | cut -f 1 -d "-"`

if test -z $KERNEL_DIR ; then
    KERNEL_DIR=/lib/modules/$VER/build
    KERNEL_SRC=/lib/modules/$VER/source
fi

if test ! -d $KERNEL_DIR ; then
    KERNEL_DIR=/usr/src/linux
    if test ! -d $KERNEL_DIR ; then
	echo "$ac_t""not found" 1>&6
	{ echo "configure: error: please install the kernel source or \
            specify alternate location" 1>&2; exit 1; }
    fi
fi

if test -d $KERNEL_SRC/include ; then
    INCLUDEDIRS="-I$KERNEL_SRC/include"
else if test -d $KERNEL_DIR/include ; then
    INCLUDEDIRS="-I$KERNEL_DIR/include"
fi
fi

if test $USE_KBUILD = "no" -a $VER_BASE = "2.6" -a $VER_SUBMINOR -ge 26; then
	USE_KBUILD=yes
	ARGS="$ARGS --enable-kbuild"
fi
echo "USE_KBUILD = $USE_KBUILD"

if test $VER_BASE = "2.2" ; then
    LINUX_USB_SUPPORT=no
else if test $LINUX_USB_SUPPORT = yes ; then
    # Verify that USB is supported in this kernel
    mkdir -p .tmp_driver
    cd .tmp_driver
    if test $VER_BASE = "2.6" -a $VER_SUBMINOR -ge 33; then
	    echo "#include <generated/autoconf.h>" >> hello.c
    else if test $VER_BASE = "2.6" -a $VER_SUBMINOR -ge 17; then
	    echo "#include <linux/autoconf.h>" >> hello.c
    else
	    echo "#include <linux/config.h>" >> hello.c
    fi
    fi
    echo "#if defined(CONFIG_USB) || defined(CONFIG_USB_MODULE)" >> hello.c
    echo "int usb_support;" >> hello.c
    echo "#endif" >> hello.c
    echo "int init_module(void) { return 0; }" >> hello.c
    echo "void cleanup_module(void) {}" >> hello.c
    USB_SUPPORT=`gcc -E -D__KERNEL__ hello.c $INCLUDEDIRS | grep -c usb_support`
    if test $USB_SUPPORT = 0; then
        LINUX_USB_SUPPORT=no
    fi
    cd ..
    rm -rf .tmp_driver
fi
fi

cat makefile.in | sed "s/@MODULE_NAME@/$MODULE_NAME/g" | \
    sed "s/@LINUX_USB_SUPPORT@/$LINUX_USB_SUPPORT/g" | \
    sed "s/@USE_KBUILD@/$USE_KBUILD/g" > makefile

if test $LINUX_USB_SUPPORT = yes ; then
    ./configure.usb $ARGS
    ARGS="$ARGS --enable-usb-support"
else
    ARGS="$ARGS --disable-usb-support"
fi
./configure.wd $ARGS