Major rework of the directory structure and the entire build system.

 -Erik

1 files changed, 1285 insertions, 0 deletions

diff --git a/scripts/Menuconfig b/scripts/Menuconfig
new file mode 100644
index 000000000..5d4cdce6b
--- /dev/null
+++ b/scripts/Menuconfig
@@ -0,0 +1,1285 @@
+#! /bin/sh
+#
+# This script is used to configure BusyBox.
+#
+# 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@memalpha.cx>
+# 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 $CONFIG_MODULES.
+# Fix dep_tristate to call define_bool when dependency is "n".
+#
+# 02 January 1999, Michael Elizabeth Chastain (mec@shout.net)
+# Blow away lxdialog.scrltmp on entry to activate_menu.  This protects
+# against people who use commands like ' ' to select menus.
+#
+# 24 January 1999, Michael Elizabeth Chastain, <mec@shout.net>
+# - Improve the exit message (Jeff Ronne).
+#
+# 06 July 1999, Andrzej M. Krzysztofowicz, <ankry@mif.pg.gda.pl>
+# - Support for multiple conditions in dep_tristate().
+# - Implemented new functions: define_tristate(), define_int(), define_hex(),
+#   define_string(), dep_bool().
+# 
+# 22 October 2001, Erik Andersen <andersee@debian.org>
+# - Adjusted for busybox (modified hard coded kernel specific paths, 
+#   and everything to do with modules (tristates, modbools, etc).
+
+
+#
+# Change this to TRUE if you prefer all options listed
+# in a single menu rather than the standard menu hierarchy.
+#
+single_menu_mode=
+
+#
+# Make sure we're really running bash.
+#
+[ -z "$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 "/^$1=/p" sysdeps/$TARGET_OS/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_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
+}
+
+#
+#   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
+}
+
+function dep_mbool () {
+        ques="$1"
+        var="$2"
+        dep=y
+        shift 2
+        while [ $# -gt 0 ]; do
+                if [ "$1" = y -o "$1" = m ]; 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 docs/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/^  //
+                        /<file:\\([^>]*\\)>/s//\\1/g
+                        p
+                    }" docs/Configure.help)
+
+     if [ -z "$text" ]
+     then
+          echo "There is no help available for this option."
+          return 1
+     else
+          echo "$text"
+     fi
+  else
+         echo "There is no help available for this 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 -f 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
+}
+
+#
+# Create a dialog for entering an integer into a 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$' '|' "$answer" : '[1-9][0-9]*$' '|' "$answer" : '-[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 an 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 an 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"
+        chosen=
+
+        #
+        # Scan current value of choices and set radiolist switches.
+        #
+        list=
+        set -- $choices
+        firstchoice=$2
+        while [ -n "$2" ]
+        do
+                case "$1" in
+                "$current"*)    if [ -z "$chosen" ]; then
+                                        list="$list $2 $1 ON "
+                                        chosen=1
+                                else
+                                        list="$list $2 $1 OFF "
+                                fi  ;;
+                *)              list="$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 ($0 ~ /^#|\$MAKE|mainmenu_name/) {
+                        printf("") >>menu
+                }
+                else if ($1 ~ "endmenu") {
+                        printf("}\n") >>menu
+                        return
+                } 
+                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 ($0 ~ /^#|$MAKE|mainmenu_name/) {
+                        printf("") >>menu
+                }
+                else if ($1 ~ /mainmenu_option|endmenu/) {
+                        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 [ "$?" != "0" ]
+                then
+                        clear
+                        cat <<EOM
+
+Menuconfig has encountered a possible error in one of BusyBox's
+configuration files and is unable to continue.  Here is the error
+report:
+
+EOM
+                        sed 's/^/ Q> /' MCerror
+                        cat <<EOM
+
+Please report this to the maintainer <mec@shout.net>.  You may also
+send a problem report to <busybox@oss.lineo.com>.
+
+Please indicate the BusyBox version you are trying to configure and
+which menu you were trying to enter when this error occurred.
+
+EOM
+                        cleanup
+                        exit 1
+                fi
+                rm -f MCerror
+
+                . ./MCradiolists                #Source the menu's functions
+
+                . ./MCmenu 2>MCdialog.out       #Activate the lxdialog menu
+                ret=$?
+
+                read selection <MCdialog.out
+
+                case "$ret" in
+                0|3|4|5|6)
+                        defaults="$selection$defaults"  #pseudo stack
+                        case "$ret" in
+                        0) eval $selection   ;;
+                        3) eval $selection y ;;
+                        4) eval $selection n ;;
+                        5) eval $selection m ;;
+                        6) eval $selection c ;;
+                        esac
+                        default="${defaults%%*}" defaults="${defaults#*}"
+                        ;;
+                2)      
+                        default="${selection%%\ *}"
+
+                        case "$selection" in
+                        *"-->"*|*"alt_config"*)
+                                show_readme ;;
+                        *)
+                                eval help $selection ;;
+                        esac
+                        ;;
+                255|1)
+                        break
+                        ;;
+                139)
+                        stty sane
+                        clear
+                        cat <<EOM
+
+There seems to be a problem with the lxdialog companion utility which is
+built prior to running Menuconfig.  Usually this is an indicator that you
+have upgraded/downgraded your ncurses libraries and did not remove the 
+old ncurses header file(s) in /usr/include or /usr/include/ncurses.
+
+It is VERY important that you have only one set of ncurses header files
+and that those files are properly version matched to the ncurses libraries 
+installed on your machine.
+
+You may also need to rebuild lxdialog.  This can be done by moving to
+the /usr/src/linux/scripts/lxdialog directory and issuing the 
+"make clean all" command.
+
+If you have verified that your ncurses install is correct, you may email
+the maintainer <andersen@codepoet.org> or post a message to
+<busybox@oss.lineo.com> for additional assistance. 
+
+EOM
+                        cleanup
+                        exit 139
+                        ;;
+                esac
+        done
+}
+
+#
+# Create a menu item to load an alternate configuration file.
+#
+g_alt_config () {
+        echo -n "get_alt_config 'Load an Alternate Configuration File' "\
+                >>MCmenu
+}
+
+#
+# Get alternate config file name and load the 
+# configuration from it.
+#
+get_alt_config () {
+        set -f ## Switch file expansion OFF
+
+        while true
+        do
+                ALT_CONFIG="${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 BusyBox
+configurations available on a single machine.  
+
+If you have saved a previous configuration in a file other than the
+busybox 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 BusyBox
+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 BusyBox 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 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
+                        ;;
+
+                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=
+                chosen=
+
+                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
+                        case "$1" in
+                        "$current"*)    if [ -z "$chosen" ]; then
+                                                define_bool "$2" "y"
+                                                chosen=1
+                                        else
+                                                define_bool "$2" "n"
+                                        fi ;;
+                        *)              define_bool "$2" "n" ;;
+                        esac
+                        shift ; shift
+                done
+        }
+
+        function mainmenu_name () {
+                :
+        }
+
+        function mainmenu_option () {
+                comment_is_option=TRUE
+        }
+
+        function endmenu () {
+                :
+        }
+
+        function comment () {
+                if [ "$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/config.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 $COLS -lt 80 ]
+        then
+                echo -e "\n\007Your display is too small to run Menuconfig!"
+                echo "It must be at least 19 lines by 80 columns."
+                exit 1
+        fi 
+
+        ROWS=$((ROWS-4))  COLS=$((COLS-5))
+}
+
+
+set_geometry `stty size 2>/dev/null`
+
+menu_instructions="\
+Arrow keys navigate the menu.  \
+Pressing <Enter> selects submenus --->.  \
+Highlighted letters are hotkeys.  \
+Pressing <Y> includes, and <N> excludes.  \
+Press <Esc><Esc> to exit, <?> for Help.  \
+Legend: [*] built-in  [ ] excluded  "
+
+radiolist_instructions="\
+Use the arrow keys to navigate this window or \
+press the hotkey of the item you wish to select \
+followed by the <SPACE BAR>.
+Press <?> for additional information about this option."
+
+inputbox_instructions_int="\
+Please enter a decimal value. \
+Fractions will not be accepted.  \
+Use the <TAB> key to move from the input field to the buttons below it."
+
+inputbox_instructions_hex="\
+Please enter a hexadecimal value. \
+Use the <TAB> key to move from the input field to the buttons below it."
+
+inputbox_instructions_string="\
+Please enter a string value. \
+Use the <TAB> key to move from the input field to the buttons below it."
+
+DIALOG="./scripts/lxdialog/lxdialog"
+
+bb_version="${VERSION}"
+backtitle="BusyBox v$bb_version Configuration"
+
+trap "cleanup ; exit 1" 1 2 15
+
+
+#
+# Locate default files.
+#
+CONFIG_IN=./config.in
+if [ "$1" != "" ] ; then
+        CONFIG_IN=$1
+fi
+
+DEFAULTS=sysdeps/$TARGET_OS/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 BusyBox configuration?" 5 60
+then
+        save_configuration
+        echo
+        echo
+        echo "*** End of BusyBox configuration."
+        echo "*** Check the top-level Makefile for additional configuration."
+        if [ ! -f .hdepend ] ; then
+            echo "*** Next, you must run 'make dep'."
+        else
+            echo "*** Next, you should run 'make' or 'make install'."
+        fi
+        echo
+else
+        echo
+        echo 
+        echo Your BusyBox configuration changes were NOT saved.
+        echo
+fi
+
+# Remove log if empty.
+if [ ! -s .menuconfig.log ] ; then
+        rm -f .menuconfig.log
+fi
+
+exit 0