#!/bin/sh -
#
#   lsisl -- Locate Symbols In Shared Libraries
#
#   Written for FreeBSD 6, probably won't work elsewhere.
#   Usage:  lsisl <symbol> [...]
#
#   Copyright (C) 2006 Oliver Fromme  <olli@fromme.com>  <olli@secnetix.de>
#   All rights reserved. Standard 2-clause BSD license and disclaimer applies.
#

if [ $# -lt 1 -o -z "$1" -o "x$1" != "x${1#-}" ]; then
	echo "Usage:  ${0##*/} <symbol> [...]" >&2
	echo "Locates the shared libraries that contain the given symbols." >&2
	exit 1
fi

LIBDIRS=$(/sbin/ldconfig -r | sed -n 's/:/ /g;/earch director/s+^[^/]*/+/+p')
SYMBOLS="$*"
export SYMBOLS

for DIR in $LIBDIRS; do
	if [ -d "$DIR" ]; then
		echo "$DIR"
	fi
done |
xargs -J% find % -depth 1 -type f -name "*.so.*" |
sort |
xargs nm -D |
awk '
	BEGIN {
		split(ENVIRON["SYMBOLS"], a)
		for (i in a)
			symbols[a[i]] = 1
	}

	{
		if (NF == 1) {
			currlib = $1
			sub(/:$/, "", currlib)
		}
		else if ($1 ~ /^[0-9a-f]/ && $3 in symbols)
			if (libs[$3])
				libs[$3] = libs[$3] " " currlib
			else
				libs[$3] = currlib
	}

	END {
		for (sym in libs)
			printf "%-23s\t%s\n", sym, libs[sym]
	}
' |
sort

#--