gensymoverride

#!/bin/bash
# [gensymoverride v0.2] by mjau, inspired by Autopackage's apsymbols
# v0.2.1 by sulix: LC_ALL needs to be exported for sort to pick up on it :/
# v0.2.2 by sulix: add support for exclusing a list of symbols

export LC_ALL=C

function toint() {
	echo "$1" | sed \
			-e 's/^\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\) /\1 \2 \3 /' \
			-e 's/^\([0-9]*\)\.\([0-9]*\) /\1 \2 0 /' |\
		awk '{ print $1*1000000 + $2*1000 + $3 }'
}

function getsymver() {
	max=4294967295
	new=$max
	newv=0
	old=0
	oldv=0
	sym=$1
	while test "x$2" != "x"; do
		shift
		sv=$(toint "$1 ")
		if test $sv -le $ver; then
			if test $sv -gt $old; then
				old=$sv
				oldv=$1
			fi
		else
			if test $sv -lt $new; then
				new=$sv
				newv=$1
			fi
		fi
	done
	if [[ "$sym" =~ $(echo ^\($(paste -sd'|' ./forbidden_symbols)\)$) ]]; then
		echo '/* skipping symbol '$sym' */'
	elif test $new -lt $max -a $old -gt 0; then
		echo '__asm__(".symver '$sym','$sym'@'$base'_'$oldv'");'
	elif test $new -lt $max; then
		echo '__asm__(".symver '$sym','$sym'@'$base'_NOT_AVAILABLE_BEFORE_'$newv'");'
	#elif test $all -ne 0; then
	#	echo '/* '$sym'@'$base'_'$oldv' */'
	fi
}

function getversions() {
	sym=$((for i in "$@"; do \
		objdump -T "$i" | grep "${base}_" | grep -v "${base}_PRIVATE" |\
		sed -e 's/.*'"${base}"'_\([.0-9]*\))* *\(.*\)/\2 \1/' \
		-e 's/^ .*//'; done) | sort | uniq)
	odd=0
	last=
	clr="                                        "
	(for i in $sym; do
		if test $odd -eq 1; then
			if test "x$last" != "x$i"; then
				last=$i
				echo
				echo -n "$i"
			fi
			odd=0
		else
			echo -n " $i"
			odd=1
		fi
	done
	echo) | grep . | while read line; do
		echo -ne "$clr$clr\r$line\r" >&2
		getsymver $line
	done
	echo -ne "$clr$clr\r" >&2
}

if test $# -lt 3; then
	echo Usage: $0 VERSIONBASE VERSION library [library ..]
	echo
	echo "Example: $0" 'GLIBC 2.3.6 /lib/*.so* /usr/lib/*.so* >le-2.3.6.h'
	echo '  Will generate symbols compatible with GLIBC versions up to 2.3.6'
	echo '  based on libraries found in /lib and /usr/lib.'
	exit 1
fi




base=$1
ver=$(toint "$2 ")
shift
shift
getversions "$@"