#!/bin/sh
#
# checkf --
#
# Author: Takaaki Tateishi
# Time-stamp: "1999-03-10 07:34:59 ttate"
#
# Options:
# -h:    help
# -n:    not print to stderr

if test "$CC" = ""
then
    CC=gcc
fi

OPTS=
FUNC=
NUM=1
TMPFILE=
EXEFILE=
STDERR=true

if test "$1" = ""
then
    echo "function was not specified"
    exit
fi

while test "$1" != ""
do
    case "$1"
    in
    "-h"|"--help")
	echo "checkf [-h|--help] [-n] func options ..."
	exit;;
    "-n") STDERR=false; shift;;
    *)
	if test "$FUNC" = ""
	then
	    FUNC=$1
	else
	    OPTS="$OPTS $1"
	fi
	shift;;
    esac
done

NUM=1
while test -f exe$NUM
do
    NUM=`expr $NUM + 1`
done
EXEFILE=exe$NUM

NUM=1
while test -f tmp$NUM.c
do
    NUM=`expr $NUM + 1`
done
TMPFILE=tmp$NUM.c

cat > $TMPFILE <<EOF
#include <stdio.h>
int
main(int argc, char *argv[])
{
    void (*func)();
    func = $FUNC;
    return 0;
};
EOF

if test "$STDERR" = "true"
then
    echo -n "$FUNC() ..... " 1>&2
fi

$CC $OPTS $TMPFILE -o $EXEFILE 2> /dev/null 1> /dev/null

if ./$EXEFILE 2> /dev/null 1> /dev/null
then
    rm -f $EXEFILE $TMPFILE
    echo "true"
    if test "$STDERR" = "true"
    then
	echo "true" 1>&2
    fi
    exit 0
else
    rm -f $EXEFILE $TMPFILE
    echo "false"
    if test "$STDERR" = "true"
    then
	echo "false" 1>&2
    fi
    exit 1
fi