* better

[mascara-docs.git] / i386 / linux-2.3.21 / scripts / Menuconfig

#! /bin/sh
#
# This script is used to configure the linux kernel.
#
# It was inspired by a desire to not have to hit <enter> 9 million times
# or startup the X server just to change a single kernel parameter.  
#
# This script attempts to parse the configuration files, which are
# scattered throughout the kernel source tree, and creates a temporary
# set of mini scripts which are in turn used to create nested menus and
# radiolists.
#
# It uses a very modified/mutilated version of the "dialog" utility
# written by Savio Lam (lam836@cs.cuhk.hk). Savio is not responsible
# for this script or the version of dialog used by this script.
# Please do not contact him with questions. The official version of 
# dialog is available at sunsite.unc.edu or a sunsite mirror.
#
# Portions of this script were borrowed from the original Configure
# script.
#
# William Roadcap was the original author of Menuconfig.
# Michael Elizabeth Chastain (mec@shout.net) is the current maintainer.
#
# 070497 Bernhard Kaindl (bkaindl@netway.at) - get default values for
# new bool, tristate and dep_tristate parameters from the defconfig file.
# new configuration parameters are marked with '(NEW)' as in make config.
#
# 180697 Bernhard Kaindl (bkaindl@netway.at) - added the needed support
# for string options. They are handled like the int and hex options.
#
# 081297 Pavel Machek (pavel@atrey.karlin.mff.cuni.cz) - better error 
# handling
#
# 131197 Michael Chastain (mec@shout.net) - output all lines for a
# choice list, not just the selected one.  This makes the output
# the same as Configure output, which is important for smart config
# dependencies.
#
# 101297 Michael Chastain (mec@shout.net) - remove sound driver cruft.
#
# 221297 Michael Chastain (mec@shout.net) - make define_bool actually
# define its arguments so that later tests on them work right.
#
# 160198 Michael Chastain (mec@shout.net) - fix bug with 'c' command
# (complement existing value) when used on virgin uninitialized variables.
#
# 090398 Axel Boldt (boldt@math.ucsb.edu) - allow for empty lines in help
# texts.
#
# 12 Dec 1998, Michael Elizabeth Chastain (mec@shout.net)
# Remove a /tmp security hole in get_def (also makes it faster).
# Give uninitialized variables canonical values rather than null value.
# Change a lot of places to call set_x_info uniformly.
# Take out message about preparing version (old sound driver cruft).
#
# 13 Dec 1998, Riley H Williams (rhw@bigfoot.com)
# When an error occurs, actually display the error message as well as
# our comments thereon.
#
# 31 Dec 1998, Michael Elizabeth Chastain (mec@shout.net)
# Fix mod_bool to honor $CONFIG_MODULES.
# Fix dep_tristate to call define_bool when dependency is "n".
#
# 02 January 1999, Michael Elizabeth Chastain (mec@shout.net)
# Blow away lxdialog.scrltmp on entry to activate_menu.  This protects
# against people who use commands like ' ' to select menus.
#
# 24 January 1999, Michael Elizabeth Chastain, <mec@shout.net>
# - Improve the exit message (Jeff Ronne).
#
# 06 July 1999, Andrzej M. Krzysztofowicz, <ankry@mif.pg.gda.pl>
# - Support for multiple conditions in dep_tristate().
# - Implemented new functions: define_tristate(), define_int(), define_hex(),
#   define_string(), dep_bool().
# 


#
# Change this to TRUE if you prefer all kernel options listed
# in a single menu rather than the standard menu hierarchy.
#
single_menu_mode=

#
# Make sure we're really running bash.
#
[ -z "$BASH" ] && { echo "Menuconfig requires bash" 1>&2; exit 1; }

#
# Cache function definitions, turn off posix compliance
#
set -h +o posix



# Given a configuration variable, set the global variable $x to its value,
# and the global variable $info to the string " (NEW)" if this is a new
# variable.
#
# This function looks for: (1) the current value, or (2) the default value
# from the arch-dependent defconfig file, or (3) a default passed by the caller.

function set_x_info () {
    eval x=\$$1
    if [ -z "$x" ]; then
        eval `sed -n -e 's/# \(.*\) is not set.*/\1=n/' -e "/^$1=/p" arch/$ARCH/defconfig`
        eval x=\${$1:-"$2"}
        eval $1=$x
        eval INFO_$1="' (NEW)'"
    fi
    eval info="\$INFO_$1"
}

#
# Load the functions used by the config.in files.
#
# I do this because these functions must be redefined depending
# on whether they are being called for interactive use or for
# saving a configuration to a file.
#
# Thank the heavens bash supports nesting function definitions.
#
load_functions () {

#
# Additional comments
#
function comment () {
        comment_ctr=$[ comment_ctr + 1 ]
        echo -ne "': $comment_ctr' '--- $1' " >>MCmenu
}

#
# Define a boolean to a specific value.
#
function define_bool () {
        eval $1=$2
}

function define_tristate () {
        eval $1=$2
}

function define_hex () {
        eval $1=$2
}

function define_int () {
        eval $1=$2
}

function define_string () {
        eval $1="$2"
}

#
# Create a boolean (Yes/No) function for our current menu
# which calls our local bool function.
#
function bool () {
        set_x_info "$2" "n"

        case $x in
        y|m)    flag="*" ;;
        n)      flag=" " ;;
        esac

        echo -ne "'$2' '[$flag] $1$info' " >>MCmenu

        echo -e "function $2 () { l_bool '$2' \"\$1\" ;}\n" >>MCradiolists
}

#
# Create a tristate (Yes/No/Module) radiolist function
# which calls our local tristate function.
#
# Collapses to a boolean (Yes/No) if module support is disabled.
#
function tristate () {
        if [ "$CONFIG_MODULES" != "y" ]
        then
                bool "$1" "$2"
        else
                set_x_info "$2" "n"
        
                case $x in
                y) flag="*" ;;
                m) flag="M" ;;
                *) flag=" " ;;
                esac
        
                echo -ne "'$2' '<$flag> $1$info' " >>MCmenu
        
                echo -e "
                function $2 () { l_tristate '$2' \"\$1\" ;}" >>MCradiolists
        fi
}

#
# Create a tristate radiolist function which is dependent on
# another kernel configuration option.
#
# Quote from the original configure script:
#
#       If the option we depend upon is a module,
#       then the only allowable options are M or N.  If Y, then
#       this is a normal tristate.  This is used in cases where modules
#       are nested, and one module requires the presence of something
#       else in the kernel.
#
function dep_tristate () {
        ques="$1"
        var="$2"
        dep=y
        shift 2
        while [ $# -gt 0 ]; do
                if   [ "$1" = y ]; then
                        shift
                elif [ "$1" = m ]; then
                        dep=m
                        shift
                else
                        dep=n
                        shift $#
                fi
        done
        if [ "$dep" = y ]; then
            tristate "$ques" "$var"
        elif [ "$dep" = m ]; then
            mod_bool "$ques" "$var"
        else 
            define_tristate "$var" n
        fi
}

#
#   Same as above, but now only Y and N are allowed as dependency
#   (i.e. third and next arguments).
#
function dep_bool () {
        ques="$1"
        var="$2"
        dep=y
        shift 2
        while [ $# -gt 0 ]; do
                if [ "$1" = y ]; then
                        shift
                else
                        dep=n
                        shift $#
                fi
        done
        if [ "$dep" = y ]; then
            bool "$ques" "$var"
        else 
            define_bool "$var" n
        fi
}

#
# Add a menu item which will call our local int function.
# 
function int () {
        set_x_info "$2" "$3"

        echo -ne "'$2' '($x) $1$info' " >>MCmenu

        echo -e "function $2 () { l_int '$1' '$2' '$3' '$x' ;}" >>MCradiolists
}

#
# Add a menu item which will call our local hex function.
# 
function hex () {
        set_x_info "$2" "$3"
        x=${x##*[x,X]}

        echo -ne "'$2' '($x) $1$info' " >>MCmenu

        echo -e "function $2 () { l_hex '$1' '$2' '$3' '$x' ;}" >>MCradiolists
}

#
# Add a menu item which will call our local string function.
# 
function string () {
        set_x_info "$2" "$3"

        echo -ne "'$2' '     $1: \"$x\"$info' " >>MCmenu

        echo -e "function $2 () { l_string '$1' '$2' '$3' '$x' ;}" >>MCradiolists
}

#
# Add a menu item which will call our local One-of-Many choice list.
#
function choice () {
        #
        # Need to remember params cause they're gonna get reset.
        #
        title=$1
        choices=$2
        default=$3
        current=

        #
        # Find out if one of the choices is already set.
        # If it's not then make it the default.
        #
        set -- $choices
        firstchoice=$2

        while [ -n "$2" ]
        do
                if eval [ "_\$$2" = "_y" ]
                then
                        current=$1
                        break
                fi
                shift ; shift
        done

        : ${current:=$default}

        echo -ne "'$firstchoice' '($current) $title' " >>MCmenu

        echo -e "
        function $firstchoice () \
                { l_choice '$title' \"$choices\" $current ;}" >>MCradiolists
}

} # END load_functions()





#
# Extract available help for an option from Configure.help
# and send it to standard output.
#
# Most of this function was borrowed from the original kernel
# Configure script.
#
function extract_help () {
  if [ -f Documentation/Configure.help ]
  then
     #first escape regexp special characters in the argument:
     var=$(echo "$1"|sed 's/[][\/.^$*]/\\&/g')
     #now pick out the right help text:
     text=$(sed -n "/^$var[     ]*\$/,\${
                        /^$var[         ]*\$/c\\
${var}:\\

                        /^#/b
                        /^[^    ]/q
                        s/^  //
                        p
                    }" Documentation/Configure.help)

     if [ -z "$text" ]
     then
          echo "There is no help available for this kernel option."
          return 1
     else
          echo "$text"
     fi
  else
         echo "There is no help available for this kernel option."
         return 1
  fi
}

#
# Activate a help dialog.
#
function help () {
        if extract_help $1 >help.out
        then
                $DIALOG --backtitle "$backtitle" --title "$2"\
                        --textbox help.out $ROWS $COLS
        else
                $DIALOG --backtitle "$backtitle" \
                        --textbox help.out $ROWS $COLS
        fi
        rm help.out
}

#
# Show the README file.
#
function show_readme () {
        $DIALOG --backtitle "$backtitle" \
                --textbox scripts/README.Menuconfig $ROWS $COLS
}

#
# Begin building the dialog menu command and Initialize the 
# Radiolist function file.
#
function menu_name () {
        echo -ne "$DIALOG --title '$1'\
                        --backtitle '$backtitle' \
                        --menu '$menu_instructions' \
                        $ROWS $COLS $((ROWS-10)) \
                        '$default' " >MCmenu
        >MCradiolists
}

#
# Add a submenu option to the menu currently under construction.
#
function submenu () {
        echo -ne "'activate_menu $2' '$1  --->' " >>MCmenu
}

#
# Handle a boolean (Yes/No) option.
#
function l_bool () {
        if [ -n "$2" ]
        then
                case "$2" in
                y|m)    eval $1=y ;;
                c)      eval x=\$$1
                        case $x in
                        y) eval $1=n ;;
                        n) eval $1=y ;;
                        *) eval $1=y ;;
                        esac ;;
                *)      eval $1=n ;;
                esac
        else
                echo -ne "\007"
        fi
}

#
# Same as bool() except options are (Module/No)
#
function mod_bool () {
        if [ "$CONFIG_MODULES" != "y" ]; then
            define_bool "$2" "n"
        else
            set_x_info "$2" "n"
 
            case $x in
            y|m) flag='M' ;;
            *)   flag=' ' ;;
            esac
 
            echo -ne "'$2' '<$flag> $1$info' " >>MCmenu
 
            echo -e "function $2 () { l_mod_bool '$2' \"\$1\" ;}" >>MCradiolists
        fi
}

#
# Same as l_bool() except options are (Module/No)
#
function l_mod_bool() {
        if [ -n "$2" ]
        then
                case "$2" in
                y)      echo -en "\007"
                        ${DIALOG} --backtitle "$backtitle" \
                                  --infobox "\
This feature depends on another which has been configured as a module.  \
As a result, this feature will be built as a module." 4 70
                        sleep 5
                        eval $1=m ;;
                m)      eval $1=m ;;
                c)      eval x=\$$1
                        case $x in
                        m) eval $1=n ;;
                        n) eval $1=m ;;
                        *) eval $1=m ;;
                        esac ;;
                *)      eval $1=n ;;
                esac
        else
                echo -ne "\007"
        fi
}

#
# Handle a tristate (Yes/No/Module) option.
#
function l_tristate () {
        if [ -n "$2" ]
        then
                eval x=\$$1

                case "$2" in
                y) eval $1=y ;;
                m) eval $1=m ;;
                c) eval x=\$$1
                   case $x in
                   y) eval $1=n ;;
                   n) eval $1=m ;;
                   m) eval $1=y ;;
                   *) eval $1=y ;;
                   esac ;;
                *) eval $1=n ;;
                esac
        else
                echo -ne "\007"
        fi
}

#
# Create a dialog for entering an integer into a kernel option.
#
function l_int () {
        while true
        do
                if $DIALOG --title "$1" \
                        --backtitle "$backtitle" \
                        --inputbox "$inputbox_instructions_int" \
                        10 75 "$4" 2>MCdialog.out
                then
                        answer="`cat MCdialog.out`"
                        answer="${answer:-$3}"

                        # Semantics of + and ? in GNU expr changed, so
                        # we avoid them:
                        if expr "$answer" : '0$\|-[1-9][0-9]*$\|[1-9][0-9]*$' >/dev/null
                        then
                                eval $2="$answer"
                        else
                                eval $2="$3"
                                echo -en "\007"
                                ${DIALOG} --backtitle "$backtitle" \
                                        --infobox "You have made an invalid entry." 3 43
                                sleep 2
                        fi

                        break
                fi

                help "$2" "$1"
        done
}

#
# Create a dialog for entering a hexadecimal into a kernel option.
#
function l_hex () {
        while true
        do
                if $DIALOG --title "$1" \
                        --backtitle "$backtitle" \
                        --inputbox "$inputbox_instructions_hex" \
                        10 75 "$4" 2>MCdialog.out
                then
                        answer="`cat MCdialog.out`"
                        answer="${answer:-$3}"
                        answer="${answer##*[x,X]}"

                        if expr "$answer" : '[0-9a-fA-F][0-9a-fA-F]*$' >/dev/null
                        then
                                eval $2="$answer"
                        else
                                eval $2="$3"
                                echo -en "\007"
                                ${DIALOG} --backtitle "$backtitle" \
                                        --infobox "You have made an invalid entry." 3 43
                                sleep 2
                        fi

                        break
                fi

                help "$2" "$1"
        done
}

#
# Create a dialog for entering a string into a kernel option.
#
function l_string () {
        while true
        do
                if $DIALOG --title "$1" \
                        --backtitle "$backtitle" \
                        --inputbox "$inputbox_instructions_string" \
                        10 75 "$4" 2>MCdialog.out
                then
                        answer="`cat MCdialog.out`"
                        answer="${answer:-$3}"

                        #
                        # Someone may add a nice check for the entered
                        # string here...
                        #
                        eval $2=\"$answer\"

                        break
                fi

                help "$2" "$1"
        done
}


#
# Handle a one-of-many choice list.
#
function l_choice () {
        #
        # Need to remember params cause they're gonna get reset.
        #
        title="$1"
        choices="$2"
        current="$3"

        #
        # Scan current value of choices and set radiolist switches.
        #
        list=
        set -- $choices
        firstchoice=$2
        while [ -n "$2" ]
        do
                case "$1" in
                "$current")     list="$list $2 $1 ON "  ;;
                *)              list="$list $2 $1 OFF " ;;
                esac
                        
                shift ; shift
        done

        while true
        do
                if $DIALOG --title "$title" \
                        --backtitle "$backtitle" \
                        --radiolist "$radiolist_instructions" \
                        15 70 6 $list 2>MCdialog.out
                then
                        choice=`cat MCdialog.out`
                        break
                fi

                help "$firstchoice" "$title"
        done

        #
        # Now set the boolean value of each option based on
        # the selection made from the radiolist.
        #
        set -- $choices
        while [ -n "$2" ]
        do
                if [ "$2" = "$choice" ]
                then
                        eval $2="y"
                else
                        eval $2="n"
                fi
                
                shift ; shift
        done
}

#
# Call awk, and watch for error codes, etc.
#
function callawk () {
awk "$1" || echo "Awk died with error code $?. Giving up." || exit 1
}

#
# A faster awk based recursive parser. (I hope)
#
function parser1 () {
callawk '
BEGIN {
        menu_no = 0
        comment_is_option = 0
        parser("'$CONFIG_IN'","MCmenu0")
}

function parser(ifile,menu) {

        while (getline <ifile) {
                if ($1 == "mainmenu_option") {
                        comment_is_option = "1"
                }
                else if ($1 == "comment" && comment_is_option == "1") {
                        comment_is_option= "0"
                        sub($1,"",$0)
                        ++menu_no

                        printf("submenu %s MCmenu%s\n", $0, menu_no) >>menu

                        newmenu = sprintf("MCmenu%d", menu_no);
                        printf( "function MCmenu%s () {\n"\
                                "default=$1\n"\
                                "menu_name %s\n",\
                                 menu_no, $0) >newmenu

                        parser(ifile, newmenu)
                }
                else if ($1 ~ "endmenu") {
                        printf("}\n") >>menu
                        return
                } 
                else if ($0 ~ /^#|\$MAKE|mainmenu_name/) {
                        printf("") >>menu
                }
                else if ($1 == "source") {
                        parser($2,menu)
                }
                else {
                        print >>menu
                }
        }
}'
}

#
# Secondary parser for single menu mode.
#
function parser2 () {
callawk '
BEGIN {
        parser("'$CONFIG_IN'","MCmenu0")
}

function parser(ifile,menu) {

        while (getline <ifile) {
                if ($1 ~ /mainmenu_option|endmenu/) {
                        printf("") >>menu
                } 
                else if ($0 ~ /^#|$MAKE|mainmenu_name/) {
                        printf("") >>menu
                }
                else if ($1 == "source") {
                        parser($2,menu)
                }
                else {
                        print >>menu
                }
        }
}'
}

#
# Parse all the config.in files into mini scripts.
#
function parse_config_files () {
        rm -f MCmenu*

        echo "function MCmenu0 () {" >MCmenu0
        echo 'default=$1' >>MCmenu0
        echo "menu_name 'Main Menu'" >>MCmenu0

        if [ "_$single_menu_mode" = "_TRUE" ]
        then
                parser2
        else
                parser1
        fi

        echo "comment ''"       >>MCmenu0
        echo "g_alt_config"     >>MCmenu0
        echo "s_alt_config"     >>MCmenu0

        echo "}" >>MCmenu0

        #
        # These mini scripts must be sourced into the current
        # environment in order for all of this to work.  Leaving
        # them on the disk as executables screws up the recursion
        # in activate_menu(), among other things.  Once they are
        # sourced we can discard them.
        #
        for i in MCmenu*
        do
                echo -n "."
                source ./$i
        done
        rm -f MCmenu*
}

#
# This is the menu tree's bootstrap.
#
# Executes the parsed menus on demand and creates a set of functions,
# one per configuration option.  These functions will in turn execute
# dialog commands or recursively call other menus.
#
function activate_menu () {
        rm -f lxdialog.scrltmp
        while true
        do
                comment_ctr=0           #So comment lines get unique tags

                $1 "$default" 2> MCerror #Create the lxdialog menu & functions

                if [ "$?" != "0" ]
                then
                        clear
                        cat <<EOM

Menuconfig has encountered a possible error in one of the kernel's
configuration files and is unable to continue.  Here is the error
report:

EOM
                        sed 's/^/ Q> /' MCerror
                        cat <<EOM

Please report this to the maintainer <mec@shout.net>.  You may also
send a problem report to <linux-kernel@vger.rutgers.edu>.

Please indicate the kernel version you are trying to configure and
which menu you were trying to enter when this error occurred.

EOM
                        cleanup
                        exit 1
                fi
                rm -f MCerror

                . ./MCradiolists                #Source the menu's functions

                . ./MCmenu 2>MCdialog.out       #Activate the lxdialog menu
                ret=$?

                read selection <MCdialog.out

                case "$ret" in
                0|3|4|5|6)
                        defaults="$selection\x12$defaults"  #pseudo stack
                        case "$ret" in
                        0) eval $selection   ;;
                        3) eval $selection y ;;
                        4) eval $selection n ;;
                        5) eval $selection m ;;
                        6) eval $selection c ;;
                        esac
                        default="${defaults%%\x12*}" defaults="${defaults#*\x12}"
                        ;;
                2)      
                        default="${selection%%\ *}"

                        case "$selection" in
                        *"-->"*|*"alt_config"*)
                                show_readme ;;
                        *)
                                eval help $selection ;;
                        esac
                        ;;
                255|1)
                        break
                        ;;
                139)
                        stty sane
                        clear
                        cat <<EOM

There seems to be a problem with the lxdialog companion utility which is
built prior to running Menuconfig.  Usually this is an indicator that you
have upgraded/downgraded your ncurses libraries and did not remove the 
old ncurses header file(s) in /usr/include or /usr/include/ncurses.

It is VERY important that you have only one set of ncurses header files
and that those files are properly version matched to the ncurses libraries 
installed on your machine.

You may also need to rebuild lxdialog.  This can be done by moving to
the /usr/src/linux/scripts/lxdialog directory and issuing the 
"make clean all" command.

If you have verified that your ncurses install is correct, you may email
the maintainer <mec@shout.net> or post a message to
<linux-kernel@vger.rutgers.edu> for additional assistance. 

EOM
                        cleanup
                        exit 139
                        ;;
                esac
        done
}

#
# Create a menu item to load an alternate configuration file.
#
g_alt_config () {
        echo -n "get_alt_config 'Load an Alternate Configuration File' "\
                >>MCmenu
}

#
# Get alternate config file name and load the 
# configuration from it.
#
get_alt_config () {
        set -f ## Switch file expansion OFF

        while true
        do
                ALT_CONFIG="${ALT_CONFIG:-$DEFAULTS}"

                $DIALOG --backtitle "$backtitle" \
                        --inputbox "\
Enter the name of the configuration file you wish to load.  \
Accept the name shown to restore the configuration you \
last retrieved.  Leave blank to abort."\
                        11 55 "$ALT_CONFIG" 2>MCdialog.out

                if [ "$?" = "0" ]
                then
                        ALT_CONFIG=`cat MCdialog.out`

                        [ "_" = "_$ALT_CONFIG" ] && break

                        if eval [ -r "$ALT_CONFIG" ]
                        then
                                eval load_config_file "$ALT_CONFIG"
                                break
                        else
                                echo -ne "\007"
                                $DIALOG --backtitle "$backtitle" \
                                        --infobox "File does not exist!"  3 38
                                sleep 2
                        fi
                else
                        cat <<EOM >help.out

For various reasons, one may wish to keep several different kernel
configurations available on a single machine.  

If you have saved a previous configuration in a file other than the
kernel's default, entering the name of the file here will allow you
to modify that configuration.

If you are uncertain, then you have probably never used alternate 
configuration files.  You should therefor leave this blank to abort.

EOM
                        $DIALOG --backtitle "$backtitle"\
                                --title "Load Alternate Configuration"\
                                --textbox help.out $ROWS $COLS
                fi
        done

        set +f ## Switch file expansion ON
        rm -f help.out MCdialog.out
}

#
# Create a menu item to store an alternate config file.
#
s_alt_config () {
        echo -n "save_alt_config 'Save Configuration to an Alternate File' "\
                 >>MCmenu
}

#
# Get an alternate config file name and save the current
# configuration to it.
#
save_alt_config () {
        set -f  ## Switch file expansion OFF
                        
        while true
        do
                $DIALOG --backtitle "$backtitle" \
                        --inputbox "\
Enter a filename to which this configuration should be saved \
as an alternate.  Leave blank to abort."\
                        10 55 "$ALT_CONFIG" 2>MCdialog.out

                if [ "$?" = "0" ]
                then
                        ALT_CONFIG=`cat MCdialog.out`

                        [ "_" = "_$ALT_CONFIG" ] && break

                        if eval touch $ALT_CONFIG 2>/dev/null
                        then
                                eval save_configuration $ALT_CONFIG
                                load_functions  ## RELOAD
                                break
                        else
                                echo -ne "\007"
                                $DIALOG --backtitle "$backtitle" \
                                        --infobox "Can't create file!  Probably a nonexistent directory." 3 60
                                sleep 2
                        fi
                else
                        cat <<EOM >help.out

For various reasons, one may wish to keep different kernel
configurations available on a single machine.  

Entering a file name here will allow you to later retrieve, modify
and use the current configuration as an alternate to whatever 
configuration options you have selected at that time.

If you are uncertain what all this means then you should probably
leave this blank.
EOM
                        $DIALOG --backtitle "$backtitle"\
                                --title "Save Alternate Configuration"\
                                --textbox help.out $ROWS $COLS
                fi
        done

        set +f  ## Switch file expansion ON
        rm -f help.out MCdialog.out
}

#
# Load config options from a file.
# Converts all "# OPTION is not set" lines to "OPTION=n" lines
#
function load_config_file () {
        awk '
          /# .* is not set.*/ { printf("%s=n\n", $2) }
        ! /# .* is not set.*/ { print }
        ' $1 >.tmpconfig

        source ./.tmpconfig
        rm -f .tmpconfig
}

#
# Just what it says.
#
save_configuration () {
        echo
        echo -n "Saving your kernel configuration."

        #
        # Now, let's redefine the configuration functions for final
        # output to the config files.
        #
        # Nested function definitions, YIPEE!
        #
        function bool () {
                set_x_info "$2" "n"
                eval define_bool "$2" "$x"
        }

        function tristate () {
                set_x_info "$2" "n"
                eval define_tristate "$2" "$x"
        }

        function dep_tristate () {
                set_x_info "$2" "n"
                var="$2"
                shift 2
                while [ $# -gt 0 ]; do
                        if   [ "$1" = y ]; then
                                shift
                        elif [ "$1" = m -a "$x" != n ]; then
                                x=m; shift
                        else 
                                x=n; shift $#
                        fi
                done
                define_tristate "$var" "$x"
        }

        function dep_bool () {
                set_x_info "$2" "n"
                var="$2"
                shift 2
                while [ $# -gt 0 ]; do
                        if   [ "$1" = y ]; then
                                shift
                        else 
                                x=n; shift $#
                        fi
                done
                define_bool "$var" "$x"
        }

        function int () {
                set_x_info "$2" "$3"
                echo "$2=$x"            >>$CONFIG
                echo "#define $2 ($x)"  >>$CONFIG_H
        }

        function hex () {
                set_x_info "$2" "$3"
                echo "$2=$x"                     >>$CONFIG
                echo "#define $2 0x${x##*[x,X]}" >>$CONFIG_H
        }

        function string () {
                set_x_info "$2" "$3"
                echo "$2=\"$x\""                         >>$CONFIG
                echo "#define $2 \"$x\""        >>$CONFIG_H
        }

        function define_hex () {
                eval $1="$2"
                echo "$1=$2"                    >>$CONFIG
                echo "#define $1 0x${2##*[x,X]}"        >>$CONFIG_H
        }

        function define_int () {
                eval $1="$2"
                echo "$1=$2"                    >>$CONFIG
                echo "#define $1 ($2)"          >>$CONFIG_H
        }

        function define_string () {
                eval $1="$2"
                echo "$1=\"$2\""                >>$CONFIG
                echo "#define $1 \"$2\""        >>$CONFIG_H
        }

        function define_bool () {
                define_tristate "$1" "$2"
        }

        function define_tristate () {
                eval $1="$2"

                case "$2" in
                y)
                        echo "$1=y"             >>$CONFIG
                        echo "#define $1 1"     >>$CONFIG_H
                        ;;

                m)
                        if [ "$CONFIG_MODULES" = "y" ]
                        then
                                echo "$1=m"                >>$CONFIG
                                echo "#undef  $1"          >>$CONFIG_H
                                echo "#define $1_MODULE 1" >>$CONFIG_H
                        else
                                echo "$1=y"             >>$CONFIG
                                echo "#define $1 1"     >>$CONFIG_H
                        fi
                        ;;

                n)
                        echo "# $1 is not set"  >>$CONFIG
                        echo "#undef  $1"       >>$CONFIG_H
                        ;;
                esac
        }

        function choice () {
                #
                # Find the first choice that's already set to 'y'
                #
                choices="$2"
                default="$3"
                current=

                set -- $choices
                while [ -n "$2" ]
                do
                        if eval [ "_\$$2" = "_y" ]
                        then
                                current=$1
                                break
                        fi
                        shift ; shift
                done

                #
                # Use the default if none were set.  
                #
                : ${current:=$default}

                #
                # Output all choices (to be compatible with other configs).
                #
                set -- $choices
                while [ -n "$2" ]
                do
                        if eval [ "$1" = "$current" ]
                        then
                            define_bool "$2" "y"
                        else
                            define_bool "$2" "n"
                        fi
                        shift ; shift
                done
        }

        function mainmenu_name () {
                :
        }

        function mainmenu_option () {
                comment_is_option=TRUE
        }

        function endmenu () {
                :
        }

        function comment () {
                if [ "$comment_is_option" ]
                then
                        comment_is_option=
                        echo        >>$CONFIG
                        echo "#"    >>$CONFIG
                        echo "# $1" >>$CONFIG
                        echo "#"    >>$CONFIG

                        echo         >>$CONFIG_H
                        echo "/*"    >>$CONFIG_H
                        echo " * $1" >>$CONFIG_H
                        echo " */"   >>$CONFIG_H
                fi
        }

        echo -n "."

        DEF_CONFIG="${1:-.config}"
        DEF_CONFIG_H="include/linux/autoconf.h"

        CONFIG=.tmpconfig
        CONFIG_H=.tmpconfig.h

        echo "#" >$CONFIG
        echo "# Automatically generated by make menuconfig: don't edit" >>$CONFIG
        echo "#" >>$CONFIG

        echo "/*" >$CONFIG_H
        echo " * Automatically generated by make menuconfig: don't edit" >>$CONFIG_H
        echo " */" >>$CONFIG_H
        echo "#define AUTOCONF_INCLUDED" >> $CONFIG_H

        echo -n "."
        if . $CONFIG_IN >>.menuconfig.log 2>&1
        then
                if [ "$DEF_CONFIG" = ".config" ]
                then
                        mv $CONFIG_H $DEF_CONFIG_H
                fi

                if [ -f "$DEF_CONFIG" ]
                then
                        rm -f ${DEF_CONFIG}.old
                        mv $DEF_CONFIG ${DEF_CONFIG}.old
                fi

                mv $CONFIG $DEF_CONFIG
                        
                return 0
        else
                return 1
        fi
}

#
# Remove temporary files
#
cleanup () {
        cleanup1
        cleanup2
}

cleanup1 () {
        rm -f MCmenu* MCradiolists MCdialog.out help.out
}

cleanup2 () {
        rm -f .tmpconfig .tmpconfig.h
}

set_geometry () {
        # Some distributions export these with incorrect values
        # which can really screw up some ncurses programs.
        LINES=  COLUMNS=

        ROWS=${1:-24}  COLS=${2:-80} 

        # Just in case the nasty rlogin bug returns.
        #
        [ $ROWS = 0 ] && ROWS=24
        [ $COLS = 0 ] && COLS=80

        if [ $ROWS -lt 19 -o $COLS -lt 80 ]
        then
                echo -e "\n\007Your display is too small to run Menuconfig!"
                echo "It must be at least 19 lines by 80 columns."
                exit 0
        fi 

        ROWS=$((ROWS-4))  COLS=$((COLS-5))
}


set_geometry `stty size 2>/dev/null`

menu_instructions="\
Arrow keys navigate the menu.  \
<Enter> selects submenus --->.  \
Highlighted letters are hotkeys.  \
Pressing <Y> includes, <N> excludes, <M> modularizes features.  \
Press <Esc><Esc> to exit, <?> for Help.  \
Legend: [*] built-in  [ ] excluded  <M> module  < > module capable"

radiolist_instructions="\
Use the arrow keys to navigate this window or \
press the hotkey of the item you wish to select \
followed by the <SPACE BAR>.
Press <?> for additional information about this option."

inputbox_instructions_int="\
Please enter a decimal value. \
Fractions will not be accepted.  \
Use the <TAB> key to move from the input field to the buttons below it."

inputbox_instructions_hex="\
Please enter a hexadecimal value. \
Use the <TAB> key to move from the input field to the buttons below it."

inputbox_instructions_string="\
Please enter a string value. \
Use the <TAB> key to move from the input field to the buttons below it."

DIALOG="./scripts/lxdialog/lxdialog"

kernel_version="${VERSION}.${PATCHLEVEL}.${SUBLEVEL}"

backtitle="Linux Kernel v$kernel_version Configuration"

trap "cleanup ; exit 1" 1 2 15


#
# Locate default files.
#
CONFIG_IN=./config.in
if [ "$1" != "" ] ; then
        CONFIG_IN=$1
fi

DEFAULTS=arch/$ARCH/defconfig
if [ -f .config ]; then
  DEFAULTS=.config
fi

if [ -f $DEFAULTS ]
then
  echo "Using defaults found in" $DEFAULTS
  load_config_file $DEFAULTS
else
  echo "No defaults found"
fi


# Fresh new log.
>.menuconfig.log

# Load the functions used by the config.in files.
echo -n "Preparing scripts: functions" 
load_functions

if [ ! -e $CONFIG_IN ]
then
        echo "Your main config.in file ($CONFIG_IN) does not exist"
        exit 1
fi

if [ ! -x $DIALOG ]
then
        echo "Your lxdialog utility does not exist"
        exit 1
fi

#
# Read config.in files and parse them into one shell function per menu.
#
echo -n ", parsing"
parse_config_files $CONFIG_IN

echo "done."
#
# Start the ball rolling from the top.
#
activate_menu MCmenu0

#
# All done!
#
cleanup1

#
# Confirm and Save
#
if $DIALOG --backtitle "$backtitle" \
           --yesno "Do you wish to save your new kernel configuration?" 5 60
then
        save_configuration
        echo
        echo
        echo "*** End of Linux kernel configuration."
        echo "*** Check the top-level Makefile for additional configuration."
        if [ ! -f .hdepend -o "$CONFIG_MODVERSIONS" = "y" ] ; then
            echo "*** Next, you must run 'make dep'."
        else
            echo "*** Next, you may run 'make zImage', 'make zdisk', or 'make zlilo.'"
        fi
        echo
else
        echo
        echo 
        echo Your kernel configuration changes were NOT saved.
        echo
fi
exit 0