configure

#!/bin/sh

has() {
	header=/usr/include/$1
	[ -f $header ] && grep -q $2 $header
}

doconfigure() {
	printf 'CPPFLAGS=-I/usr/include -I/usr/local/include -Iother\n'
	printf 'CFLAGS=-std=c99 -Wall -O2\n'
	printf 'LDFLAGS=-L/usr/local/lib -lsodium\n'

	printf 'OBJS=reop.o\n'
	printf 'OBJS+=main.o\n'
	# always include base64.c. testing for correct versions is too hard
	printf 'OBJS+=other/base64.o\n'
	if has features.h _GNU_SOURCE ; then
		printf 'CPPFLAGS+=-D_GNU_SOURCE\n'
	fi
	if ! has string.h strlcpy ; then
		printf 'OBJS+=other/strlcpy.o\n'
		printf 'CPPFLAGS+=-DNEED_STRLCPY\n'
	fi
	if ! has string.h strlcat ; then
		printf 'OBJS+=other/strlcat.o\n'
		printf 'CPPFLAGS+=-DNEED_STRLCAT\n'
	fi
	if ! has readpassphrase.h readpassphrase ; then
		printf 'OBJS+=other/readpassphrase.o\n'
	fi
		
	if has util.h bcrypt_pbkdf ; then
		printf 'LDFLAGS+=-lutil\n'
	else
		printf 'OBJS+=other/bcrypt_pbkdf.o\n'
		if ! has blf.h Blowfish_initstate ; then
			printf 'OBJS+=other/blowfish.o\n'
		fi
	fi

	printf '\n'
	printf '.c.o:\n'
	printf '\t${CC} ${CFLAGS} ${CPPFLAGS} -o $@ -c $<\n'
	printf '\n'
	printf 'reop: ${OBJS}\n'
	printf '\t${CC} ${OBJS} -o reop ${LDFLAGS}\n'
	printf '\n'
	printf 'clean:\n'
	printf '\trm -f ${OBJS} reop\n'
}

doconfigure > Makefile