#!/bin/sh
#
# Copyright (c) 2021, 2022, 2023 Omar Polo <op@omarpolo.com>
# Copyright (c) 2011, 2013-2022 Ingo Schwarze <schwarze@openbsd.org>
# Copyright (c) 2010, 2011, 2012 Kristaps Dzonsons <kristaps@bsd.lv>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

set -e

RELEASE=no
VERSION=2.0.2-current

usage()
{
	echo "usage: $0 [--help] [--prefix=prefix] [OPTION=VALUE...]" >&2
	exit 1
}

if command -v yacc 2>/dev/null >&2; then
	YACC=yacc
elif command -v bison 2>/dev/null >&2; then
	YACC=bison
else
	# assume yacc by default.  Make will fail building parse.y if
	# not from a release tarball, but at least it'll have a decent
	# error message.
	YACC=yacc
fi

pkgconfig=

CC=${CC:-cc}

if [ "$RELEASE" = no ]; then
	CFLAGS=${CFLAGS:--O0 -g3}
else
	CFLAGS=${CFLAGS:--O2 -pipe}
fi

INSTALL=${INSTALL-install}
PREFIX=${PREFIX-/usr/local}
SYSCONFDIR=${SYSCONFDIR-/etc}

CDIAGFLAGS=
CDIAGFLAGS="${CDIAGFLAGS} -W -Wall -Wextra -Wpointer-arith -Wuninitialized"
CDIAGFLAGS="${CDIAGFLAGS} -Wstrict-prototypes -Wmissing-prototypes -Wunused"
CDIAGFLAGS="${CDIAGFLAGS} -Wsign-compare -Wno-unused-parameter" # -Wshadow
CDIAGFLAGS="${CDIAGFLAGS} -Wno-missing-field-initializers"
CDIAGFLAGS="${CDIAGFLAGS} -Wno-pointer-sign"

# On all OSes except OpenBSD use the bundled one.  It may crash at
# runtime otherwise since we depend on the libtls internals for the
# privsep crypto engine.
# See <https://codeberg.org/op/gmid/issues/2>.
LIBTLS=bundled # or system
if [ "$(uname || true)" = OpenBSD ]; then
	LIBTLS=system
fi

while [ $# -gt 0 ]; do
	key="${1%%=*}"
	val="${1#*=}"

	if [ "$key" = --help ]; then
		usage
	fi

	if [ "$key" = -Werror ]; then
		CDIAGFLAGS="$CDIAGFLAGS -Werror"
		shift
		continue
	fi

	if [ "$key" = --enable-sandbox ]; then
		key=DISABLE_SANDBOX
		val=0
	fi

	if [ "$key" = --disable-sandbox ]; then
		key=DISABLE_SANDBOX
		val=1
	fi

	if [ "$key" = "$1" ]; then
		# if no --xy=, look at the next arg
		if ! shift 2>/dev/null; then
			echo "$0: missing value for $key" >&2
			exit 1
		fi
		val="$1"
	fi

	case "$key" in
	--bindir)	key=BINDIR ;;
	--mandir)	key=MANDIR ;;
	--prefix)	key=PREFIX ;;
	--sysconfdir)	key=SYSCONFDIR ;;
	--with-libtls)	key=LIBTLS ;;
	esac

	case "$key" in
	LIBTLS)
		case "$val" in
		bundled)	LIBTLS=bundled ;;
		system)		LIBTLS=system  ;;
		*)		usage ;;
		esac
		;;
	BINDIR)		BINDIR="$val" ;;
	CC)		CC="$val" ;;
	CFLAGS)		CFLAGS="$val" ;;
	CDIAGFLAGS)	CDIAGFLAGS="$val" ;;
	DISABLE_SANDBOX) DISABLE_SANDBOX="$val" ;;
	INSTALL)	INSTALL="$val" ;;
	LDFLAGS)	LDFLAGS="$val" ;;
	MANDIR)		MANDIR="$val" ;;
	PKG_CONFIG)	PKG_CONFIG="$val" ;;
	PREFIX)		PREFIX="$val" ;;
	SYSCONFDIR)	SYSCONFDIR="$val" ;;
	YACC)		YACC="$val" ;;
	*)		usage
	esac

	shift
done

[ -w config.log ] && mv config.log config.log.old
[ -w config.h   ] && mv config.h   config.h.old

exec 3> config.log
echo "file config.log: writing..."

NEED_GNU_SOURCE=0
NEED_OPENBSD_SOURCE=0
NEED_LIBBSD_OPENBSD_VIS=0

COMPATS=
COMP="${CC} ${CFLAGS} -Werror=implicit-function-declaration"

# singletest name var extra-cflags extra-libs msg
singletest() {
	msg="$5"
	if [ -z "$msg" ]; then
		if [ -n "$3" ]; then
			msg=" ($3)"
		elif [ -n "$4" ]; then
			msg=" ($4)"
		fi
	elif [ "$msg" = no ]; then
		msg=""
	fi

	cat >&3 <<EOF
${1}: testing...
$COMP have/${1}.c $3 -o test-$1 $LDFLAGS $4
EOF
	if $COMP have/${1}.c $3 -o test-$1 $LDFLAGS $4 >&3 2>&3; then
		rm -f test-${1} test-${1}.d

		echo "${1}: $CC$msg succeeded" >&3
		echo "${1}$msg: yes"
		echo >&3

		return 0
	fi

	echo "${1}: $CC$msg failed $?" >&3
	echo "${1}$msg: no"
	echo >&3

	return 1
}

# deptest name var
deptest() {
	if singletest "$1" "$2" "${CFLAGS}" "${LIBS}" no; then
		eval HAVE_${2}=1
		return 0
	fi

	if [ -f compat/${1}.c ]; then
		COMPATS="compat/$1.c $COMPATS"
	fi

	eval HAVE_${2}=0
	return 1
}

# runtest name var extra-cflags extra-libs pkgconfig-name
runtest() {
	if singletest "$1" "$2" "" ""; then
		eval HAVE_${2}=1
		return 0
	fi

	if [ -n "$3" -o -n "$4" ]; then
		echo "retrying with ${3+$3 }$4" >&3
		if singletest "$1" "$2" "$3" "$4"; then
			eval HAVE_${2}=1
			if [ "$3" = -D_GNU_SOURCE ]; then
				NEED_GNU_SOURCE=1
				return 0
			fi
			if [ "$4" = -D_OPENBSD_SOURCE ]; then
				NEED_OPENBSD_SOURCE=1
				return 0
			fi
			if [ "$4" = -DLIBBSD_OPENBSD_VIS ]; then
				NEED_LIBBSD_OPENBSD_VIS=1
				return 0
			fi
			if [ -n "$3" ]; then
				CFLAGS="$CFLAGS $3"
			fi
			if [ -n "$4" ]; then
				LIBS="$LIBS $4"
			fi
			return 0
		fi
	fi

	if [ -n "$5" -a -n "$pkgconfig" ]; then
		if $pkgconfig $5; then
			cflags="$($pkgconfig --cflags $5)"
			ldflags="$($pkgconfig --libs $5)"
			echo "retrying with pkg-config" >&3
			if singletest "$1" "$2" "$cflags" "$ldflags"; then
				CFLAGS="$CFLAGS $cflags"
				LIBS="$LIBS $ldflags"
				eval HAVE_$2=1
				return 0
			fi
		fi
	fi

	if [ -f compat/$1.c ]; then
		COMPATS="compat/$1.c $COMPATS"
	fi

	eval HAVE_$2=0
	return 1
}

if [ "$PKG_CONFIG" = no ]; then
	echo "pkg-config: disabled"
elif [ -n "$PKG_CONFIG" ]; then
	pkgconfig="$PKG_CONFIG"
	echo "pkg-config: (manual) $PKG_CONFIG"
elif command -v pkg-config 2>/dev/null >&2; then
	pkgconfig="pkg-config"
	echo "pkg-config: (auto) pkg-config"
else
	echo "pkg-config: not found"
fi

if singletest noop MMD -MMD; then
	CFLAGS="${CFLAGS} -MMD"
fi

if ! runtest wait_any WAIT_ANY; then
	CFLAGS="${CFLAGS} -DWAIT_ANY=-1"
fi

HAVE_ENDIAN_H=0
HAVE_SYS_ENDIAN_H=0
HAVE_MACHINE_ENDIAN=0

runtest endian_h	ENDIAN_H	|| \
runtest sys_endian_h	SYS_ENDIAN_H	|| \
runtest machine_endian	MACHINE_ENDIAN	|| true

if [ ${HAVE_ENDIAN_H} -eq 0 -a \
     ${HAVE_SYS_ENDIAN_H} -eq 0 -a \
     ${HAVE_MACHINE_ENDIAN} -eq 0 ]; then
	echo "FATAL: no endian header found" 1>&2
	echo "FATAL: no endian header found" 1>&3
	exit 1
fi

runtest arc4random	ARC4RANDOM	|| true
runtest arc4random_buf	ARC4RANDOM_BUF	|| true
runtest err		ERR		|| true
runtest explicit_bzero	EXPLICIT_BZERO	|| true
runtest freezero	FREEZERO	|| true
runtest getdtablecount	GETDTABLECOUNT	|| true
runtest getdtablesize	GETDTABLESIZE	|| true
runtest getprogname	GETPROGNAME	|| true
runtest imsg		IMSG		"" -lutil libimsg || true
runtest landlock	LANDLOCK	|| true
runtest libevent	LIBEVENT	"" -levent libevent_core|| true
runtest memmem		MEMMEM		-D_GNU_SOURCE || true
runtest openssl		OPENSSL		"" '-lcrypto -lssl' 'libcrypto libssl' || true
runtest pr_set_name	PR_SET_NAME	|| true
runtest program_invocation_short_name PROGRAM_INVOCATION_SHORT_NAME -D_GNU_SOURCE || true
runtest queue_h		QUEUE_H		|| true
runtest reallocarray	REALLOCARRAY	-D_OPENBSD_SOURCE	|| true
runtest recallocarray	RECALLOCARRAY	|| true
runtest setproctitle	SETPROCTITLE	|| true
runtest setresgid	SETRESGID	-D_GNU_SOURCE || true
runtest setresuid	SETRESUID	-D_GNU_SOURCE || true
runtest strlcat		STRLCAT		|| true
runtest strlcpy		STRLCPY		|| true
runtest strtonum	STRTONUM	-D_OPENBSD_SOURCE	|| true
runtest timingsafe_memcmp TIMINGSAFE_MEMCMP || true
runtest tree_h		TREE_H		|| true
runtest vasprintf	VASPRINTF	-D_GNU_SOURCE || true
runtest vis		VIS		-DLIBBSD_OPENBSD_VIS	|| true

if [ ${HAVE_ARC4RANDOM} -eq 1 -a ${HAVE_ARC4RANDOM_BUF} -eq 0 ]; then
	COMPATS="compat/arc4random.c ${COMPATS}"
fi

if [ ${HAVE_ARC4RANDOM} -eq 0 ]; then
	runtest getentropy GETENTROPY || true
else
	# fake it
	HAVE_GETENTROPY=1
fi

if [ ${HAVE_ARC4RANDOM} -eq 0 -a ${HAVE_GETENTROPY} -eq 1 ]; then
	COMPATS="compat/getentropy.c ${COMPATS}"
fi

if [ "${LIBTLS}" = system ]; then
	runtest libtls	LIBTLS		"" -ltls libtls || true

	# not actually needed
	HAVE_ASN1_TIME_TM_CMP=1
	HAVE_ASN1_TIME_TM_CLAMP_NOTAFTER=1
	HAVE_ASN1_TIME_PARSE=1
	HAVE_SSL_CTX_UCCM=1
	HAVE_SSL_CTX_LVM=1
	HAVE_X509_LOOKUP_MEM=1
else
	# use bundled one
	HAVE_LIBTLS=1
	for f in compat/libtls/*.c; do
		COMPATS="$f ${COMPATS}"
	done

	CFLAGS="-Icompat/libtls -I../compat/libtls ${CFLAGS}"

	deptest ASN1_time_tm_cmp ASN1_TIME_TM_CMP			|| true
	deptest ASN1_time_tm_clamp_notafter ASN1_TIME_TM_CLAMP_NOTAFTER	|| true
	deptest ASN1_time_parse ASN1_TIME_PARSE				|| true
	deptest SSL_CTX_use_certificate_chain_mem SSL_CTX_UCCM		|| true
	deptest SSL_CTX_load_verify_mem SSL_CTX_LVM			|| true
	deptest X509_LOOKUP_mem X509_LOOKUP_MEM				|| true
fi

deptest libevent2	LIBEVENT2	|| true

if [ ${HAVE_LIBTLS} -eq 0 ]; then
	echo "FATAL: openssl not found" 1>&2
	echo "FATAL: openssl not found" 1>&3
	exit 1
fi

if [ ${HAVE_OPENSSL} -eq 0 ]; then
	echo "FATAL: openssl not found" 1>&2
	echo "FATAL: openssl not found" 1>&3
	exit 1
fi

if [ ${HAVE_LIBEVENT} -eq 0 ]; then
	echo "FATAL: libevent not found" 1>&2
	echo "FATAL: libevent not found" 1>&3
	exit 1
fi

if [ ${HAVE_IMSG} -eq 0 ]; then
	# compat/imsg.c is implicitly added
	COMPATS="$COMPATS compat/imsg-buffer.c"
fi

if [ ${HAVE_QUEUE_H} -eq 0 -o ${HAVE_IMSG} -eq 0 -o ${HAVE_TREE_H} -eq 0 ]; then
	CFLAGS="${CFLAGS} -I ${PWD}/compat"
fi

if [ ${HAVE_VIS} -eq 0 ]; then
	CFLAGS="${CFLAGS} -I ${PWD}/compat/vis"
fi

if [ $HAVE_LIBEVENT2 -eq 1 ]; then
	CFLAGS="$CFLAGS -DHAVE_LIBEVENT2=1"
fi

if [ $NEED_GNU_SOURCE = 1 ]; then
	CFLAGS="$CFLAGS -D_GNU_SOURCE"
fi
if [ $NEED_OPENBSD_SOURCE = 1 ]; then
	CFLAGS="$CFLAGS -D_OPENBSD_SOURCE"
fi
if [ $NEED_LIBBSD_OPENBSD_VIS = 1 ]; then
	CFLAGS="$CFLAGS -DLIBBSD_OPENBSD_VIS"
fi

CFLAGS="-I. ${CFLAGS} ${CDIAGFLAGS}"

exec > config.h
echo "config.h: writing.." >&2

cat <<__HEREDOC__
#ifdef __cplusplus
#error "Do not use C++."
#endif
__HEREDOC__

[ ${HAVE_STRLCAT} -eq 0 -o ${HAVE_STRLCPY} -eq 0 -o ${HAVE_IMSG} -eq 0 ] \
	&& echo "#include <sys/types.h>"
[ ${HAVE_VASPRINTF} -eq 0 ] && echo "#include <stdarg.h>"

if [ ${HAVE_QUEUE_H} -eq 1 ]; then
	echo "#include <sys/queue.h>"
else
	echo "#include <queue.h>"
fi

if [ ${HAVE_TREE_H} -eq 1 ]; then
	echo "#include <sys/tree.h>"
else
	echo "#include <tree.h>"
fi

echo "#include <sys/types.h>"
echo "#include <sys/uio.h>"
echo "#include <stdint.h>"
echo "#include <imsg.h>"
echo "#include <limits.h>"

cat <<__HEREDOC__

#define VERSION			"${VERSION}"
#define DISABLE_SANDBOX		${DISABLE_SANDBOX}
#define HAVE_LANDLOCK		${HAVE_LANDLOCK}

#ifndef SYSCONFDIR
# define SYSCONFDIR		"${SYSCONFDIR}"
#endif

__HEREDOC__

if [ ${HAVE_ENDIAN_H} -eq 1 ]; then
	echo "#include <endian.h>"
elif [ ${HAVE_SYS_ENDIAN_H} -eq 1 ]; then
	echo "#include <sys/endian.h>"
elif [ ${HAVE_MACHINE_ENDIAN} -eq 1 ]; then
	cat <<__HEREDOC__
#include <machine/endian.h>
#include <libkern/OSByteOrder.h>

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

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

# define htobe64(x) OSSwapHostToBigInt64(x)
# define htole64(x) OSSwapHostToLittleInt64(x)
# define be64toh(x) OSSwapBigToHostInt64(x)
# define le64toh(x) OSSwapLittleToHostInt64(x)
__HEREDOC__
fi

[ ${HAVE_ARC4RANDOM_BUF} -eq 0 -o \
  ${HAVE_ASN1_TIME_PARSE} -eq 0 -o \
  ${HAVE_EXPLICIT_BZERO} -eq 0 -o \
  ${HAVE_FREEZERO} -eq 0 -o \
  ${HAVE_GETENTROPY} -eq 0 -o \
  ${HAVE_REALLOCARRAY} -eq 0 -o \
  ${HAVE_RECALLOCARRAY} -eq 0 -o \
  ${HAVE_STRLCAT} -eq 0 -o \
  ${HAVE_STRLCPY} -eq 0 -o \
  ${HAVE_STRTONUM} -eq 0 -o \
  ${HAVE_TIMINGSAFE_MEMCMP} -eq 0 ] && echo "#include <stddef.h>"

[ ${HAVE_ARC4RANDOM} -eq 0 ] && echo "#include <stdint.h>"

[ ${HAVE_SETRESGID} -eq 0 -o \
  ${HAVE_SETRESUID} -eq 0 ] && echo "#include <unistd.h>"

if [ ${HAVE_GETENTROPY} -eq 1 ]; then
	echo "#define HAVE_GETENTROPY 1"
else
	echo "#define WITH_OPENSSL 1"
	echo "#define OPENSSL_PRNG_ONLY 1"
fi

if [ ${HAVE_ARC4RANDOM} -eq 0 ]; then
	echo "extern	uint32_t arc4random(void);"
else
	echo "#define HAVE_ARC4RANDOM 1"
fi
if [ ${HAVE_ARC4RANDOM_BUF} -eq 0 ]; then
	echo "extern	void	 arc4random_buf(void *, size_t);"
else
	echo "#define HAVE_ARC4RANDOM_BUF 1"
fi

if [ ${HAVE_ASN1_TIME_TM_CMP} -eq 0 ]; then
	echo "struct tm;"
	echo "extern	int	ASN1_time_tm_cmp(struct tm *, struct tm *);"
else
	echo "#define HAVE_ASN1_TIME_TM_CMP 1"
fi

if [ ${HAVE_ASN1_TIME_TM_CLAMP_NOTAFTER} -eq 0 ]; then
	echo "struct tm;"
	echo "extern	int	ASN1_time_tm_clamp_notafter(struct tm *);"
else
	echo "#define HAVE_ASN1_TIME_TM_CLAMP_NOTAFTER 1"
fi

if [ ${HAVE_ASN1_TIME_PARSE} -eq 0 ]; then
	echo "struct tm;"
	echo "extern	int	ASN1_time_parse(const char *, size_t, struct tm *, int);"
else
	echo "#define HAVE_ASN1_TIME_PARSE 1"
fi

if [ ${HAVE_ERR} -eq 0 ]; then
	echo "extern	void	 err(int, const char*, ...);"
	echo "extern	void	 errx(int, const char*, ...);"
	echo "extern	void	 warn(const char*, ...);"
	echo "extern	void	 warnx(const char*, ...);"
else
	echo "#include <err.h>"
fi
if [ ${HAVE_EXPLICIT_BZERO} -eq 0 ]; then
	echo "extern	void	 explicit_bzero(void*, size_t);"
fi
if [ ${HAVE_FREEZERO} -eq 0 ]; then
	echo "extern	void	 freezero(void*, size_t);"
fi
if [ ${HAVE_GETDTABLECOUNT} -eq 0 ]; then
	echo "extern	int	 getdtablecount(void);"
fi
if [ ${HAVE_GETDTABLESIZE} -eq 0 ]; then
	echo "extern	int	 getdtablesize(void);"
fi
if [ ${HAVE_GETENTROPY} -eq 0 ]; then
	echo "extern	int	 getentropy(void *, size_t);"
fi
if [ ${HAVE_GETPROGNAME} -eq 0 ]; then
	echo "extern	const char *getprogname(void);"
fi
if [ ${HAVE_MEMMEM} -eq 0 ]; then
	echo "extern void *memmem(const void *, size_t, const void *, size_t);"
fi
if [ ${HAVE_REALLOCARRAY} -eq 0 ]; then
	echo "extern	void	*reallocarray(void*, size_t, size_t);"
fi
if [ ${HAVE_RECALLOCARRAY} -eq 0 ]; then
	echo "extern	void	*recallocarray(void*, size_t, size_t, size_t);"
fi
if [ ${HAVE_SETPROCTITLE} -eq 0 ]; then
	echo "extern	void	 setproctitle(const char *fmt, ...);"
fi
if [ ${HAVE_SETRESGID} -eq 0 ]; then
	echo "extern	int	 setresgid(gid_t, gid_t, gid_t);"
fi
if [ ${HAVE_SETRESUID} -eq 0 ]; then
	echo "extern	int	 setresuid(uid_t, uid_t, uid_t);"
fi
if [ ${HAVE_STRLCAT} -eq 0 ]; then
	echo "extern	size_t	 strlcat(char*, const char*, size_t);"
fi
if [ ${HAVE_STRLCPY} -eq 0 ]; then
	echo "extern	size_t	 strlcpy(char*, const char*, size_t);"
fi
if [ ${HAVE_STRTONUM} -eq 0 ]; then
	echo "extern	long long strtonum(const char*, long long, long long, const char**);"
fi
if [ ${HAVE_TIMINGSAFE_MEMCMP} -eq 0 ]; then
	echo "extern	int	timingsafe_memcmp(const void *, const void *, size_t);"
fi
if [ ${HAVE_VASPRINTF} -eq 0 ]; then
	echo "extern	int	 vasprintf(char**, const char*, va_list);"
fi

if [ ${HAVE_ASN1_TIME_TM_CMP} -eq 0 ]; then
	echo "#include <openssl/asn1.h>"
	echo "struct tm;"
	echo "int ASN1_time_tm_cmp(struct tm *, struct tm *);"
else
	echo "#define HAVE_ASN1_TIME_TM_CMP 1"
fi

if [ ${HAVE_SSL_CTX_UCCM} -eq 0 -o ${HAVE_SSL_CTX_LVM} -eq 0 ]; then
	echo "#include <openssl/ssl.h>"
fi

if [ ${HAVE_SSL_CTX_UCCM} -eq 0 ]; then
	echo "int SSL_CTX_use_certificate_chain_mem(SSL_CTX *, void *, int);"
else
	echo "#define HAVE_SSL_CTX_USE_CERTIFICATE_CHAIN_MEM 1"
fi

if [ ${HAVE_SSL_CTX_LVM} -eq 0 ]; then
	echo "int SSL_CTX_load_verify_mem(SSL_CTX *, void *, int);"
else
	echo "#define HAVE_SSL_CTX_LOAD_VERIFY_MEM 1"
fi

if [ ${HAVE_X509_LOOKUP_MEM} -eq 0 ]; then
	echo "#include <openssl/x509_vfy.h>"
	echo "X509_LOOKUP_METHOD *X509_LOOKUP_mem(void);"
else
	echo "#define HAVE_X509_LOOKUP_MEM 1"
fi

cat <<__HEREDOC__

#ifndef __dead
#define __dead __attribute__((noreturn))
#endif

/* Linux and OpenBSD have LOGIN_NAME_MAX, FreeBSD MAXLOGNAME. */
#ifndef LOGIN_NAME_MAX
# if defined(MAXLOGNAME)
#  define LOGIN_NAME_MAX MAXLOGNAME
# elif defined(_POSIX_LOGIN_NAME_MAX)
#  define LOGIN_NAME_MAX _POSIX_LOGIN_NAME_MAX
# else
#  define LOGIN_NAME_MAX 32
# endif
#endif

#ifndef HOST_NAME_MAX
# if defined(_POSIX_HOST_NAME_MAX)
#  define HOST_NAME_MAX _POSIX_HOST_NAME_MAX
# else
#  define HOST_NAME_MAX 255
# endif
#endif
__HEREDOC__

echo "file config.h: written" 1>&2
echo "file config.h: written" 1>&3

exec > config.mk

[ -z "${BINDIR}" ] && BINDIR="\${PREFIX}/bin"
[ -z "${MANDIR}" ] && MANDIR="\${PREFIX}/man"

cat << __HEREDOC__
CC		= ${CC}
CFLAGS		= ${CFLAGS}
LDFLAGS		= ${LDFLAGS}
LIBS		= ${LIBS}
YACC		= ${YACC}
STATIC		= ${STATIC}
PREFIX		= ${PREFIX}
BINDIR		= ${BINDIR}
MANDIR		= ${MANDIR}

INSTALL		= ${INSTALL}
INSTALL_PROGRAM	= \${INSTALL} -m 0555
INSTALL_LIB	= \${INSTALL} -m 0444
INSTALL_MAN	= \${INSTALL} -m 0444
INSTALL_DATA	= \${INSTALL} -m 0444

COMPATS=	${COMPATS}

VERSION		= ${VERSION}

__HEREDOC__

echo "file config.mk: written" 1>&2
echo "file config.mk: written" 1>&3

echo >&2
echo "Now run \`make' to compile." >&2
echo >&2

exit 0