#!/bin/sh

# Set define options
#
use_zlib=yes
use_debug=yes

# Set the prefix path
#
prefix=/opt/apache

# Set the install paths
#
bindir=${prefix}/bin
mandir=${prefix}/man

# Parse command line arguments
#
ac_prearg=
for ac_option
do

	# If the previous option needs an argument, assign it.
	#
	if [ -n "$ac_prearg" ]; then
		eval "$ac_prearg=\$ac_option"
		ac_prearg=
		continue
	fi

	ac_optarg=`expr "x$ac_option" : 'x[^=]*=\(.*\)'`

	case $ac_option in
		--prefix)
			prefix=$ac_prearg
			bindir=${prefix}/bin
			mandir=${prefix}/man
			;;
		--prefix=*)
			prefix=$ac_optarg
			bindir=${prefix}/bin
			mandir=${prefix}/man
			;;
		--bindir)
			bindir=$ac_prearg
			;;
		--bindir=*)
			bindir=$ac_optarg
			;;
		--mandir)
			mandir=$ac_prearg
			;;
		--mandir=*)
			mandir=$ac_optarg
			;;
		--enable-*)
			ac_feature=`expr "x$ac_option" : 'x-*enable-\([^=]*\)'`
			if [ "$ac_optarg" = "y" -o "$ac_optarg" = "yes" ]; then
				ac_optarg=yes
			else
				ac_optarg=no
			fi
			eval use_${ac_feature}=$ac_optarg
			;;
		--disable-*)
			ac_feature=`expr "x$ac_option" : 'x-*disable-\(.*\)'`
			eval use_${ac_feature}=no
			;;
		*)
			cat << EOF
Usage: configure [options]
Options: [defaults in brackets after descriptions]
Configuration:
  --help                  print this message
Directory and file names:
  --prefix=PREFIX         install files in PREFIX [${prefix}]
  --bindir=DIR            user executables in DIR [PREFIX/bin]
  --mandir=DIR            man documentation in DIR [PREFIX/man]
Features and packages:
  --disable-FEATURE       do not include FEATURE (same as --enable-FEATURE=no)
  --enable-FEATURE[=ARG]  include FEATURE [ARG=yes]
--enable and --with options recognized:
--enable-zlib             include zlib compression support [${use_zlib}]
--enable-debug            include detailed error messages [${use_debug}]

EOF
			exit 1
			;;
	esac
done

# Make sure environment is sane
#
rm -f ./dummy* ./defines.h 1>/dev/null 2>&1

# Determine what compiler to use
#
cat << EOF > ./dummy.c
int main(void) {return(0);}
EOF
if [ -n "$CC" ]; then
	$CC -c -o ./dummy ./dummy.c 1>/dev/null 2>&1
	if [ $? -ne 0 ]; then
		$CC=
	fi
fi
if [ -z "$CC" ]; then
	for c in gcc egcs cc ; do
		$c -c -o ./dummy ./dummy.c 1>/dev/null 2>&1
		if [ $? -eq 0 ]; then
			CC=$c
			break
		fi
	done
	rm -f ./dummy*
	if [ -z "$CC" ]; then
		echo "Checking compiler: not found."
		echo
		echo "No suitable compiler found.  Install one or set $$CC env variable"
		echo
		exit 1
	fi
fi
rm -f ./dummy* 1>/dev/null 2>&1
echo "Checking compiler: $CC found."

# Get the current version number
#
echo "#define VERSION \"`cat VERSION`\"" >> ./defines.h

# Test to see if zlib 1.1.3 is available
#
if [ "$use_zlib" = "yes" ]; then
	cat << EOF > ./dummy.c
#include <stdio.h>
#include <zlib.h>
int main(void) {
	return(printf("%s", ZLIB_VERSION));
}
EOF
	$CC -o ./dummy ./dummy.c -lz 1>/dev/null 2>&1
	if [ $? -eq 0 ]; then
		if :; then
			use_zlib=yes
			LDFLAGS="$LDFLAGS -lz"
			echo "Checking zlib version: `./dummy` found."
			echo "#define USE_ZLIB" >> ./defines.h
		else
			use_zlib=no
			echo "Checking zlib version: `./dummy` found."
			echo
			echo "You must have at least version 1.1.3 installed."
			echo "If you have something newer than 1.1.3 and you're getting this"
			echo "message, edit defines.h and #define USE_ZLIB to enable it's use."
			echo
			echo "#undef USE_ZLIB" >> ./defines.h
		fi
	else
		use_zlib=no
		echo "Checking zlib version: not found."
		echo "#undef USE_ZLIB" >> ./defines.h
	fi
	rm -f ./dummy* 1>/dev/null 2>&1
else
	use_zlib=no
	echo "#undef USE_ZLIB" >> ./defines.h
fi

# Test to see if errno functions are available
#
if [ "$use_debug" = "yes" ]; then
	cat << EOF > ./dummy.c
#include <stdio.h>
#include <errno.h>
int main(void) {
	return(printf("%s", strerror(errno)));
}
EOF
	$CC -o ./dummy ./dummy.c 1>/dev/null 2>&1
	if [ $? -eq 0 ]; then
		use_debug=yes
		echo "Checking errno functions: found."
		echo "#define USE_DEBUG" >> ./defines.h
	else
		use_debug=no
		echo "Checking errno functions: not found."
		echo "#undef USE_DEBUG" >> ./defines.h
	fi
	rm -f ./dummy* 1>/dev/null 2>&1
else
	use_debug=no
	echo "#undef USE_DEBUG" >> ./defines.h
fi

# Test to see if hostent functions are avialable
#
cat << EOF > ./dummy.c
#include <stdio.h>
#include <netdb.h>
int main(void) {
	struct hostent *hostinfo;
	if ((hostinfo = gethostbyname("localhost")) != NULL)
		return(0);
	return(1);
}
EOF
$CC -o ./dummy ./dummy.c 1>/dev/null 2>&1
if [ $? -ne 0 ]; then
	$CC -o ./dummy ./dummy.c -lresolv 1>/dev/null 2>&1
	if [ $? -eq 0 ]; then
		LDFLAGS="$LDFLAGS -lresolv"
	else
		$CC -o ./dummy ./dummy.c -lnsl 1>/dev/null 2>&1
		if [ $? -eq 0 ]; then
			LDFLAGS="$LDFLAGS -lnsl"
		else
			echo
			echo "Unable to locate gethostbyname() function."
			echo
			echo "This program requires the use of hostname lookup functions, but"
			echo "we are not able to find them on your system.  Sorry."
			echo
			exit 1
		fi
	fi
fi
rm -f ./dummy* 1>/dev/null 2>&1

# Tell the user what they just did
#
cat << EOF

Your configuration settings are as follows:

Use zlib compression:    ${use_zlib}
Use detailed errors:     ${use_debug}
httplog install dir:     ${bindir}
manpage install dir:     ${mandir}

You are now ready to run 'make'.

EOF

# Make our Makefile now
#
if [ ! "$CFLAGS" ]; then
	CFLAGS="-O2 -Wall"
fi

cat << EOF > ./Makefile
all:
	${CC} ${CFLAGS} -o ./httplog ./httplog.c ${LDFLAGS}
	@echo
	@echo "Good, now you can run 'make install'."
	@echo

clean:
	rm -f ./dummy* ./httplog

distclean: clean
	rm -f ./Makefile ./defines.h

install: install-bin install-man

install-bin:
	install -d ${bindir}
	install -s -m755 ./httplog ${bindir}/httplog

install-man:
	install -d ${mandir}/man8
	install -m644 ./httplog.8 ${mandir}/man8/httplog.8
EOF

#End of configure.