#!/bin/sh
#
# Copyright (c) 1989, 1998 The Open Group
# 
# Permission to use, copy, modify, distribute, and sell this software and 
# its documentation for any purpose is hereby granted without fee, provided
# that the above copyright notice appear in all copies and that both that
# copyright notice and this permission notice appear in supporting
# documentation.
# 
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
# OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
# AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
# 
# Except as contained in this notice, the name of The Open Group shall not be
# used in advertising or otherwise to promote the sale, use or other dealings
# in this Software without prior written authorization from The Open Group.
# 
# Author:  Jim Fulton, MIT X Consortium
# 
# mergelib - merge one library into another; this is commonly used by X
#     to add the extension library into the base Xlib.
#

usage="usage:  $0  to-library from-library [object-filename-prefix]"
objprefix=_

case $# in
    2) ;;
    3) objprefix=$3 ;;
    *) echo "$usage" 1>&2; exit 1 ;;
esac

tolib=$1
fromlib=$2

if [ ! -f $fromlib ]; then
    echo "$0:  no such from-library $fromlib" 1>&2
    exit 1
fi

if [ ! -f $tolib ]; then
    echo "$0:  no such to-library $tolib" 1>&2
    exit 1
fi


#
# Create a temp directory, and figure out how to reference the 
# object files from it (i.e. relative vs. absolute path names).
#

tmpdir=tmp.$$
origdir=..

# Remove directory if we fail
trap "rm -rf $tmpdir; exit 1" 1 2 15
trap "rm -rf $tmpdir; exit 0" 1 2 13

mkdir $tmpdir

# Security: if $tmpdir exists before mkdir exit immediately
if [ $? -gt 0 -o ! -d $tmpdir ]; then
    echo "$0:  unable to create temporary directory $tmpdir" 1>&2
    exit 1
fi

case "$fromlib" in
    /?*) upfrom= ;;
    *)  upfrom=../ ;;
esac

case "$tolib" in
    /?*) upto= ;;
    *)  upto=../ ;;
esac


#
# In the temp directory, extract all of the object files and prefix
# them with some symbol to avoid name clashes with the base library.
#
cd $tmpdir || exit 1
ar x ${upfrom}$fromlib
for i in *.o; do
    mv $i ${objprefix}$i
done


#
# Merge in the object modules, ranlib (if appropriate) and cleanup
#
ar clq ${upto}$tolib *.o
ranlib ${upto}$tolib
cd $origdir
rm -rf $tmpdir

