#! /bin/sh

OS=`uname -s`
DEBUG=0
PREFIX=/usr/local

create_generic_config_h() {
    cat <<EOF > src/config.h
#ifndef _CONFIG_H
#define _CONFIG_H
#include <endian.h>
#endif /* _CONFIG_H */
EOF
}

create_darwin_config_h() {
    cat <<EOF > src/config.h
#ifndef _CONFIG_H
#define _CONFIG_H
#include <libkern/OSByteOrder.h>

#define htobe16(n) OSSwapHostToBigInt16(n)
#define htole16(n) OSSwapHostToLittleInt16(n)
#define be16toh(n) OSSwapBigToHostInt16(n)
#define le16toh(n) OSSwapLittleToHostInt16(n)

#define htobe32(n) OSSwapHostToBigInt32(n)
#define htole32(n) OSSwapHostToLittleInt32(n)
#define be32toh(n) OSSwapBigToHostInt32(n)
#define le32toh(n) OSSwapLittleToHostInt32(n)

#define htobe64(n) OSSwapHostToBigInt64(n)
#define htole64(n) OSSwapHostToLittleInt64(n)
#define be64toh(n) OSSwapBigToHostInt64(n)
#define le64toh(n) OSSwapLittleToHostInt64(n)
#endif /* _CONFIG_H */
EOF
}

create_common_build_mk() {
    if [ "$DEBUG" = 1 ]; then
        cat <<'EOF' > mk/build.mk
CGFLAGS		= -g -fno-inline
EOF
	else
		cat <<'EOF' > mk/build.mk
CGFLAGS		=
EOF
    fi

	cat <<'EOF' >> mk/build.mk
CWFLAGS		= -Wall
COFLAGS		= -O2
CFLAGS		= $(CGFLAGS) $(CWFLAGS) $(COFLAGS)
EOF
}

create_generic_build_mk() {
    create_common_build_mk $@

    cat <<'EOF' >> mk/build.mk
LLFLAGS		= -shared -Wl,-soname=$(SONAME)

STATIC		= lib$(LIBNAME).a

SONAME_SHORT	= lib$(LIBNAME).so
SONAME		= $(SONAME_SHORT).$(VERSION_MAJOR)
SONAME_FULL	= $(SONAME_SHORT).$(VERSION)

EOF

    cat <<EOF >> mk/build.mk
PREFIX      = $PREFIX
EOF
}

create_darwin_build_mk() {
    create_common_build_mk $@

    cat <<'EOF' >> mk/build.mk
LLFLAGS		= -dynamiclib -current_version $(VERSION)

STATIC      = lib$(LIBNAME).a

SONAME_SHORT	= lib$(LIBNAME).dylib
SONAME		= lib$(LIBNAME).$(VERSION_MAJOR).dylib
SONAME_FULL	= lib$(LIBNAME).$(VERSION).dylib

EOF

    cat <<EOF >> mk/build.mk
PREFIX      = $PREFIX
EOF
}

for arg in $@; do
    case $arg in
        "--enable-debug")
            DEBUG=1
        ;;
    esac
done

if [ ! -d "mk" ]; then
    mkdir -m 0755 mk
fi

case $OS in
    Darwin)
        create_darwin_config_h
		create_darwin_build_mk
    ;;

    *)
        create_generic_config_h
		create_generic_build_mk
    ;;
esac