Added a script to check for newer versions of included libs

Just run "sh checklibs.sh". Currently checks liblua, libpcre, libpcap,
and prints the latest version of liblinear (no version info is in the
copy we have). Requires perl, curl, and a C compiler (cc).

checklibs.sh

@@ -0,0 +1,74 @@
+#!/bin/sh
+
+NDIR=${NDIR:-$PWD}
+
+newest() {
+    perl -ne'$n=pack"C*",split/\./;$m=($m,$n)[$n gt$m];END{print join".",unpack("C*",$m)}'
+}
+
+trim_version() {
+    echo $1 | sed 's/\(^\|\.\)0*/\1/g'
+}
+
+check_libpcre() {
+    PCRE_SOURCE="ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/"
+    PCRE_MAJOR=""
+    PCRE_MINOR=""
+    eval $(grep '^PCRE_MAJOR=' $NDIR/libpcre/configure)
+    eval $(grep '^PCRE_MINOR=' $NDIR/libpcre/configure)
+    PCRE_VERSION="$PCRE_MAJOR.$PCRE_MINOR"
+    PCRE_LATEST=$(curl -ls $PCRE_SOURCE | perl -lne 'if(/pcre-(\d+.\d+).tar.gz$/){print $1}' | newest)
+    if [ "$PCRE_VERSION" != "$PCRE_LATEST" ]; then
+        echo "Newer version of libpcre available"
+        echo "  Current:" $PCRE_VERSION
+        echo "  Latest: " $PCRE_LATEST
+        echo "  Source: $PCRE_SOURCE"
+    fi
+}
+
+check_libpcap() {
+    PCAP_SOURCE="http://www.tcpdump.org/release/"
+    PCAP_VERSION=$(cat $NDIR/libpcap/VERSION)
+    PCAP_LATEST=$(curl -s $PCAP_SOURCE | perl -lne 'if(/libpcap-([\d.]+).tar.gz/){print $1}' | newest)
+    if [ "$PCAP_VERSION" != "$PCAP_LATEST" ]; then
+        echo "Newer version of libpcap available"
+        echo "  Current:" $PCAP_VERSION
+        echo "  Latest: " $PCAP_LATEST
+        echo "  Source: $PCAP_SOURCE"
+    fi
+}
+
+check_liblua() {
+    LUA_SOURCE="http://www.lua.org/ftp/"
+    cat >check_liblua.c <<EOC
+#include "lua.h"
+#include<stdio.h>
+int main(int argc,char *argv[]){
+printf("%s\\n", LUA_RELEASE);
+return 0;
+}
+EOC
+    cc -I"$NDIR/liblua" -o check_liblua check_liblua.c
+    LUA_VERSION=$(./check_liblua)
+    LUA_VERSION=${LUA_VERSION#Lua }
+    rm check_liblua check_liblua.c
+    LUA_LATEST=$(curl -s $LUA_SOURCE | perl -lne 'if(/lua-([\d.]+).tar.gz/){print $1}' | newest)
+    if [ "$LUA_VERSION" != "$LUA_LATEST" ]; then
+        echo "Newer version of liblua available"
+        echo "  Current:" $LUA_VERSION
+        echo "  Latest: " $LUA_LATEST
+        echo "  Source: $LUA_SOURCE"
+    fi
+}
+
+check_liblinear() {
+    LINEAR_SOURCE="http://www.csie.ntu.edu.tw/~cjlin/liblinear/"
+    echo "Can't check liblinear, no version information is available"
+    LINEAR_LATEST=$(curl -s $LINEAR_SOURCE | perl -lne 'if(/The current release \(([^)]+)\) of <b>LIBLINEAR/){print $1;exit 0}')
+    echo "  Latest:" $LINEAR_LATEST
+}
+
+check_libpcre
+check_libpcap
+check_liblua
+check_liblinear