source: trunk/essentials/app-shells/bash/support/rlvers.sh@ 3246

#! /bin/sh
#
# rlvers.sh -- run a program that prints out the readline version number
#              using locally-installed readline libraries
#

# Copyright (C) 1996-2002 Free Software Foundation, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111 USA.

PROGNAME=`basename $0`

: ${TMPDIR:=/tmp}
TDIR=$TMPDIR/rlvers

# defaults
CC=cc
RL_LIBDIR=/usr/local/lib
RL_INCDIR=/usr/local/include

TERMCAP_LIB="-ltermcap"

# cannot rely on the presence of getopts
while [ $# -gt 0 ]; do
        case "$1" in
        -C)     shift ; CC="$1"; shift ;;
        -I)     shift ; RL_INCDIR="$1" ; shift ;;
        -L)     shift ; RL_LIBDIR="$1" ; shift ;;
        -T)     shift ; TERMCAP_LIB="$1" ; shift ;;
        -v)     shift ; verbose=y ;;
        --)     shift ; break ;;
        *)      echo "${PROGNAME}: usage: $PROGNAME [-C compiler] [-L libdir] [-v]" >&2 ; exit 2;;
        esac
done

# if someone happened to install examples/rlversion, use it (it's not
# installed by default)
if test -f ${RL_LIBDIR}/rlversion ; then
        if [ -n "$verbose" ]; then
                echo "${PROGNAME}: using installed rlversion from ${RL_LIBDIR}/rlversion"
        fi
        v=`${RL_LIBDIR}/rlversion 2>/dev/null`
        case "$v" in
        unknown | "")   echo 0 ;;
        *)              echo "$v" ;;
        esac
        exit 0
fi

if [ -n "$verbose" ]; then
        echo "${PROGNAME}: using ${RL_LIBDIR} to find libreadline"
        echo "${PROGNAME}: attempting program compilation"
fi

# make $TDIR mode 0700
mkdir $TDIR || {
        echo "${PROGNAME}: ${TDIR}: file exists" >&2
        echo 0
        exit 1
}
chmod 700 $TDIR

trap 'rm -f $TDIR/rlvers $TDIR/rlvers.? ; rmdir $TDIR' 0 1 2 3 6 15

cat > $TDIR/rlvers.c << EOF
#include <stdio.h>
extern char *rl_library_version;

main()
{
        printf("%s\n", rl_library_version ? rl_library_version : "0");
        exit(0);
}
EOF

opwd=`pwd`

cd $TDIR || {
        echo "${PROGNAME}: cannot cd to $TDIR" >&2
        echo 0
        exit 1
}
        
if eval ${CC} -L${RL_LIBDIR} -I${RL_INCDIR} -o $TDIR/rlvers $TDIR/rlvers.c -lreadline ${TERMCAP_LIB};
then
        v=`$TDIR/rlvers`
else
        if [ -n "$verbose" ] ; then
                echo "${PROGNAME}: compilation failed: status $?"
                echo "${PROGNAME}: using version 0"
        fi
        v=0
fi

case "$v" in
unknown | "")   echo 0 ;;
*)              echo "$v" ;;
esac

cd $opwd
exit 0