libtraceevent: Add check for duplicate functions in man pages

Update the check-manpages.sh script to make sure that there are no
functions that are described in more than one man page.

The output will look like this:

  Found tep_find_function in libtraceevent-func_find.txt and in libtraceevent-func_apis.txt
  Found tep_find_function_address in libtraceevent-func_find.txt and in libtraceevent-func_apis.txt

Link: https://lore.kernel.org/linux-trace-devel/[email protected]/
Link: https://lore.kernel.org/linux-trace-devel/[email protected]

Reported-by: Daniel Wagner <[email protected]>
Signed-off-by: Steven Rostedt (Google) <[email protected]>

Author: rostedt

check-manpages.sh

@@ -15,12 +15,19 @@ cd $1
 MAIN=libtraceevent
 MAIN_FILE=${MAIN}.txt
 
+PROCESSED=""
+
 # Ignore man pages that do not contain functions
 IGNORE=""
 
 for man in ${MAIN}-*.txt; do
 
-	sed -ne '/^NAME/,/^SYNOP/{/^[a-z]/{s/, *$//;s/,/\n/g;s/ //g;s/-.*$/-/;/-/{s/-//p;q};p}}' $man | while read a; do
+	for a in `sed -ne '/^NAME/,/^SYNOP/{/^[a-z]/{s/, *$//;s/,/\n/g;s/ //g;s/-.*$/-/;/-/{s/-//p;q};p}}' $man`; do
+		if [ "${PROCESSED/:${a} /}" != "${PROCESSED}" ]; then
+			P="${PROCESSED/:${a} */}"
+			echo "Found ${a} in ${man} and in ${P/* /}"
+		fi
+		PROCESSED="${man}:${a} ${PROCESSED}"
 		if [ "${IGNORE/$man/}" != "${IGNORE}" ]; then
 			continue
 		fi