kconfig: use calloc() for expr allocation
[linux-2.6.git] / scripts / config
1 #!/bin/bash
2 # Manipulate options in a .config file from the command line
3
4 usage() {
5         cat >&2 <<EOL
6 Manipulate options in a .config file from the command line.
7 Usage:
8 config options command ...
9 commands:
10         --enable|-e option   Enable option
11         --disable|-d option  Disable option
12         --module|-m option   Turn option into a module
13         --set-str option string
14                              Set option to "string"
15         --set-val option value
16                              Set option to value
17         --state|-s option    Print state of option (n,y,m,undef)
18
19         --enable-after|-E beforeopt option
20                              Enable option directly after other option
21         --disable-after|-D beforeopt option
22                              Disable option directly after other option
23         --module-after|-M beforeopt option
24                              Turn option into module directly after other option
25
26         commands can be repeated multiple times
27
28 options:
29         --file .config file to change (default .config)
30
31 config doesn't check the validity of the .config file. This is done at next
32  make time.
33 EOL
34         exit 1
35 }
36
37 checkarg() {
38         ARG="$1"
39         if [ "$ARG" = "" ] ; then
40                 usage
41         fi
42         case "$ARG" in
43         CONFIG_*)
44                 ARG="${ARG/CONFIG_/}"
45                 ;;
46         esac
47         ARG="`echo $ARG | tr a-z A-Z`"
48 }
49
50 set_var() {
51         local name=$1 new=$2 before=$3
52
53         name_re="^($name=|# $name is not set)"
54         before_re="^($before=|# $before is not set)"
55         if test -n "$before" && grep -Eq "$before_re" "$FN"; then
56                 sed -ri "/$before_re/a $new" "$FN"
57         elif grep -Eq "$name_re" "$FN"; then
58                 sed -ri "s:$name_re.*:$new:" "$FN"
59         else
60                 echo "$new" >>"$FN"
61         fi
62 }
63
64 if [ "$1" = "--file" ]; then
65         FN="$2"
66         if [ "$FN" = "" ] ; then
67                 usage
68         fi
69         shift 2
70 else
71         FN=.config
72 fi
73
74 if [ "$1" = "" ] ; then
75         usage
76 fi
77
78 while [ "$1" != "" ] ; do
79         CMD="$1"
80         shift
81         case "$CMD" in
82         --refresh)
83                 ;;
84         --*-after)
85                 checkarg "$1"
86                 A=$ARG
87                 checkarg "$2"
88                 B=$ARG
89                 shift 2
90                 ;;
91         -*)
92                 checkarg "$1"
93                 shift
94                 ;;
95         esac
96         case "$CMD" in
97         --enable|-e)
98                 set_var "CONFIG_$ARG" "CONFIG_$ARG=y"
99                 ;;
100
101         --disable|-d)
102                 set_var "CONFIG_$ARG" "# CONFIG_$ARG is not set"
103                 ;;
104
105         --module|-m)
106                 set_var "CONFIG_$ARG" "CONFIG_$ARG=m"
107                 ;;
108
109         --set-str)
110                 set_var "CONFIG_$ARG" "CONFIG_$ARG=\"$1\""
111                 shift
112                 ;;
113
114         --set-val)
115                 set_var "CONFIG_$ARG" "CONFIG_$ARG=$1"
116                 shift
117                 ;;
118
119         --state|-s)
120                 if grep -q "# CONFIG_$ARG is not set" $FN ; then
121                         echo n
122                 else
123                         V="$(grep "^CONFIG_$ARG=" $FN)"
124                         if [ $? != 0 ] ; then
125                                 echo undef
126                         else
127                                 V="${V/CONFIG_$ARG=/}"
128                                 V="${V/\"/}"
129                                 echo "$V"
130                         fi
131                 fi
132                 ;;
133
134         --enable-after|-E)
135                 set_var "CONFIG_$B" "CONFIG_$B=y" "CONFIG_$A"
136                 ;;
137
138         --disable-after|-D)
139                 set_var "CONFIG_$B" "# CONFIG_$B is not set" "CONFIG_$A"
140                 ;;
141
142         --module-after|-M)
143                 set_var "CONFIG_$B" "CONFIG_$B=m" "CONFIG_$A"
144                 ;;
145
146         # undocumented because it ignores --file (fixme)
147         --refresh)
148                 yes "" | make oldconfig
149                 ;;
150
151         *)
152                 usage
153                 ;;
154         esac
155 done
156