lguest: documentation I: Preparation
The netfilter code had very good documentation: the Netfilter Hacking HOWTO.
Noone ever read it.
So this time I'm trying something different, using a bit of Knuthiness.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/Documentation/lguest/extract b/Documentation/lguest/extract
new file mode 100644
index 0000000..7730bb6
--- /dev/null
+++ b/Documentation/lguest/extract
@@ -0,0 +1,58 @@
+#! /bin/sh
+
+set -e
+
+PREFIX=$1
+shift
+
+trap 'rm -r $TMPDIR' 0
+TMPDIR=`mktemp -d`
+
+exec 3>/dev/null
+for f; do
+ while IFS="
+" read -r LINE; do
+ case "$LINE" in
+ *$PREFIX:[0-9]*:\**)
+ NUM=`echo "$LINE" | sed "s/.*$PREFIX:\([0-9]*\).*/\1/"`
+ if [ -f $TMPDIR/$NUM ]; then
+ echo "$TMPDIR/$NUM already exits prior to $f"
+ exit 1
+ fi
+ exec 3>>$TMPDIR/$NUM
+ echo $f | sed 's,\.\./,,g' > $TMPDIR/.$NUM
+ /bin/echo "$LINE" | sed -e "s/$PREFIX:[0-9]*//" -e "s/:\*/*/" >&3
+ ;;
+ *$PREFIX:[0-9]*)
+ NUM=`echo "$LINE" | sed "s/.*$PREFIX:\([0-9]*\).*/\1/"`
+ if [ -f $TMPDIR/$NUM ]; then
+ echo "$TMPDIR/$NUM already exits prior to $f"
+ exit 1
+ fi
+ exec 3>>$TMPDIR/$NUM
+ echo $f | sed 's,\.\./,,g' > $TMPDIR/.$NUM
+ /bin/echo "$LINE" | sed "s/$PREFIX:[0-9]*//" >&3
+ ;;
+ *:\**)
+ /bin/echo "$LINE" | sed -e "s/:\*/*/" -e "s,/\*\*/,," >&3
+ echo >&3
+ exec 3>/dev/null
+ ;;
+ *)
+ /bin/echo "$LINE" >&3
+ ;;
+ esac
+ done < $f
+ echo >&3
+ exec 3>/dev/null
+done
+
+LASTFILE=""
+for f in $TMPDIR/*; do
+ if [ "$LASTFILE" != $(cat $TMPDIR/.$(basename $f) ) ]; then
+ LASTFILE=$(cat $TMPDIR/.$(basename $f) )
+ echo "[ $LASTFILE ]"
+ fi
+ cat $f
+done
+