summaryrefslogtreecommitdiff
path: root/scripts/Menuconfig
blob: 30d06ee29e1b29bcb087305424f121d73894f049 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
#! /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@busybox.net>.

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@busybox.net> 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="\
Enabling options will increase the size of busybox.  \
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