kconfig/nconf: prevent segfault on empty menu
[linux-2.6.git] / scripts / gfp-translate
1 #!/bin/bash
2 # Translate the bits making up a GFP mask
3 # (c) 2009, Mel Gorman <mel@csn.ul.ie>
4 # Licensed under the terms of the GNU GPL License version 2
5 SOURCE=
6 GFPMASK=none
7
8 # Helper function to report failures and exit
9 die() {
10         echo ERROR: $@
11         if [ "$TMPFILE" != "" ]; then
12                 rm -f $TMPFILE
13         fi
14         exit -1
15 }
16
17 usage() {
18         echo "usage: gfp-translate [-h] [ --source DIRECTORY ] gfpmask"
19         exit 0
20 }
21
22 # Parse command-line arguments
23 while [ $# -gt 0 ]; do
24         case $1 in
25                 --source)
26                         SOURCE=$2
27                         shift 2
28                         ;;
29                 -h)
30                         usage
31                         ;;
32                 --help)
33                         usage
34                         ;;
35                 *)
36                         GFPMASK=$1
37                         shift
38                         ;;
39         esac
40 done
41
42 # Guess the kernel source directory if it's not set. Preference is in order of
43 # o current directory
44 # o /usr/src/linux
45 if [ "$SOURCE" = "" ]; then
46         if [ -r "/usr/src/linux/Makefile" ]; then
47                 SOURCE=/usr/src/linux
48         fi
49         if [ -r "`pwd`/Makefile" ]; then
50                 SOURCE=`pwd`
51         fi
52 fi
53
54 # Confirm that a source directory exists
55 if [ ! -r "$SOURCE/Makefile" ]; then
56         die "Could not locate kernel source directory or it is invalid"
57 fi
58
59 # Confirm that a GFP mask has been specified
60 if [ "$GFPMASK" = "none" ]; then
61         usage
62 fi
63
64 # Extract GFP flags from the kernel source
65 TMPFILE=`mktemp -t gfptranslate-XXXXXX` || exit 1
66 grep -q ___GFP $SOURCE/include/linux/gfp.h
67 if [ $? -eq 0 ]; then
68         grep "^#define ___GFP" $SOURCE/include/linux/gfp.h | sed -e 's/u$//' | grep -v GFP_BITS > $TMPFILE
69 else
70         grep "^#define __GFP" $SOURCE/include/linux/gfp.h | sed -e 's/(__force gfp_t)//' | sed -e 's/u)/)/' | grep -v GFP_BITS | sed -e 's/)\//) \//' > $TMPFILE
71 fi
72
73 # Parse the flags
74 IFS="
75 "
76 echo Source: $SOURCE
77 echo Parsing: $GFPMASK
78 for LINE in `cat $TMPFILE`; do
79         MASK=`echo $LINE | awk '{print $3}'`
80         if [ $(($GFPMASK&$MASK)) -ne 0 ]; then
81                 echo $LINE
82         fi
83 done
84
85 rm -f $TMPFILE
86 exit 0