#!/bin/sh
#
# Copyright (c) 2014, 2015, 2016 Ingo Schwarze <schwarze@openbsd.org>
#
# 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

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

# Output file descriptor usage:
# 1 (stdout): config.h, Makefile.local
# 2 (stderr): original stderr, usually to the console
# 3: config.log

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

# --- default settings -------------------------------------------------
# Initialize all variables here,
# such that nothing can leak in from the environment.

MANPATH_DEFAULT="/usr/share/man:/usr/X11R6/man:/usr/local/man"
OSNAME=

CC=`printf "all:\\n\\t@echo \\\$(CC)\\n" | env -i make -f -`
CFLAGS="-g -W -Wall -Wmissing-prototypes -Wstrict-prototypes -Wwrite-strings"
CFLAGS="${CFLAGS} -Wno-unused-parameter"
LDADD=
LDFLAGS=
LD_OHASH=
STATIC="-static"

BUILD_CGI=0

HAVE_DIRENT_NAMLEN=
HAVE_EFTYPE=
HAVE_ERR=
HAVE_FTS=
HAVE_GETLINE=
HAVE_GETSUBOPT=
HAVE_ISBLANK=
HAVE_MKDTEMP=
HAVE_OHASH=
HAVE_PLEDGE=
HAVE_PROGNAME=
HAVE_REALLOCARRAY=
HAVE_REWB_BSD=
HAVE_REWB_SYSV=
HAVE_SANDBOX_INIT=
HAVE_STRCASESTR=
HAVE_STRINGLIST=
HAVE_STRLCAT=
HAVE_STRLCPY=
HAVE_STRPTIME=
HAVE_STRSEP=
HAVE_STRTONUM=
HAVE_VASPRINTF=
HAVE_WCHAR=

PREFIX="/usr/local"
BINDIR=
SBINDIR=
INCLUDEDIR=
LIBDIR=
MANDIR=
HOMEBREWDIR=

WWWPREFIX="/var/www"
HTDOCDIR=
CGIBINDIR=

BINM_APROPOS="apropos"
BINM_MAKEWHATIS="makewhatis"
BINM_MAN="man"
BINM_SOELIM="soelim"
BINM_WHATIS="whatis"
MANM_MAN="man"
MANM_MANCONF="man.conf"
MANM_MDOC="mdoc"
MANM_ROFF="roff"
MANM_EQN="eqn"
MANM_TBL="tbl"

INSTALL="install"
INSTALL_PROGRAM=
INSTALL_LIB=
INSTALL_MAN=
INSTALL_DATA=

# --- manual settings from configure.local -----------------------------

if [ -r ./configure.local ]; then
	echo "configure.local: reading..." 1>&2
	echo "configure.local: reading..." 1>&3
	cat ./configure.local 1>&3
	. ./configure.local
else
	echo "configure.local: no (fully automatic configuration)" 1>&2
	echo "configure.local: no (fully automatic configuration)" 1>&3
fi
echo 1>&3

# --- tests for config.h  ----------------------------------------------

COMP="${CC} ${CFLAGS} -Wno-unused -Werror"

# Check whether this HAVE_ setting is manually overridden.
# If yes, use the override, if no, do not decide anything yet.
# Arguments: lower-case test name, manual value
ismanual() {
	[ -z "${2}" ] && return 1
	echo "${1}: manual (${2})" 1>&2
	echo "${1}: manual (${2})" 1>&3
	echo 1>&3
	return 0
}

# Run a single autoconfiguration test.
# In case of success, enable the feature.
# In case of failure, do not decide anything yet.
# Arguments: lower-case test name, upper-case test name, additional CFLAGS
singletest() {
	cat 1>&3 << __HEREDOC__
${1}: testing...
${COMP} ${3} -o test-${1} test-${1}.c
__HEREDOC__

	if ${COMP} ${3} -o "test-${1}" "test-${1}.c" 1>&3 2>&3; then
		echo "${1}: ${CC} succeeded" 1>&3
	else
		echo "${1}: ${CC} failed with $?" 1>&3
		echo 1>&3
		return 1
	fi

	if ./test-${1} 1>&3 2>&3; then
		echo "${1}: yes" 1>&2
		echo "${1}: yes" 1>&3
		echo 1>&3
		eval HAVE_${2}=1
		rm "test-${1}"
		return 0
	else
		echo "${1}: execution failed with $?" 1>&3
		echo 1>&3
		rm "test-${1}"
		return 1
	fi
}

# Run a complete autoconfiguration test, including the check for
# a manual override and disabling the feature on failure.
# Arguments: lower case name, upper case name, additional CFLAGS
runtest() {
	eval _manual=\${HAVE_${2}}
	ismanual "${1}" "${_manual}" && return 0
	singletest "${1}" "${2}" "${3}" && return 0
	echo "${1}: no" 1>&2
	eval HAVE_${2}=0
	return 1
}

# --- library functions ---
runtest dirent-namlen	DIRENT_NAMLEN	|| true
runtest EFTYPE		EFTYPE		|| true
runtest err		ERR		|| true
runtest fts		FTS		|| true
runtest getline		GETLINE		|| true
runtest getsubopt	GETSUBOPT	|| true
runtest isblank		ISBLANK		|| true
runtest mkdtemp		MKDTEMP		|| true
runtest pledge		PLEDGE		|| true
runtest sandbox_init	SANDBOX_INIT	|| true
runtest progname	PROGNAME	|| true
runtest reallocarray	REALLOCARRAY	|| true
runtest rewb-bsd	REWB_BSD	|| true
runtest rewb-sysv	REWB_SYSV	|| true
runtest strcasestr	STRCASESTR	|| true
runtest stringlist	STRINGLIST	|| true
runtest strlcat		STRLCAT		|| true
runtest strlcpy		STRLCPY		|| true
runtest strptime	STRPTIME	|| true
runtest strsep		STRSEP		|| true
runtest strtonum	STRTONUM	|| true
runtest vasprintf	VASPRINTF	|| true
runtest wchar		WCHAR		|| true

# --- ohash ---
if ismanual ohash "${HAVE_OHASH}"; then
	:
elif [ -n "${LD_OHASH}" ]; then
	runtest ohash OHASH "${LD_OHASH}" || true
elif singletest ohash OHASH; then
	:
elif runtest ohash OHASH "-lutil"; then
	LD_OHASH="-lutil"
fi
if [ "${HAVE_OHASH}" -eq 0 ]; then
	LD_OHASH=
fi

# --- LDADD ---
LDADD="${LDADD} ${LD_OHASH} -lz"
echo "LDADD=\"${LDADD}\"" 1>&2
echo "LDADD=\"${LDADD}\"" 1>&3
echo 1>&3

# --- write config.h ---

exec > config.h

cat << __HEREDOC__
#ifdef __cplusplus
#error "Do not use C++.  See the INSTALL file."
#endif

#if !defined(__GNUC__) || (__GNUC__ < 4)
#define __attribute__(x)
#endif

#if defined(__linux__) || defined(__MINT__)
#define _GNU_SOURCE	/* See test-*.c what needs this. */
#endif

__HEREDOC__

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

echo
echo "#define MAN_CONF_FILE \"/etc/${MANM_MANCONF}\""
echo "#define MANPATH_DEFAULT \"${MANPATH_DEFAULT}\""
[ -n "${OSNAME}" ] && echo "#define OSNAME \"${OSNAME}\""
[ -n "${HOMEBREWDIR}" ] && echo "#define HOMEBREWDIR \"${HOMEBREWDIR}\""
[ ${HAVE_EFTYPE} -eq 0 ] && echo "#define EFTYPE EINVAL"

cat << __HEREDOC__
#define HAVE_DIRENT_NAMLEN ${HAVE_DIRENT_NAMLEN}
#define HAVE_ERR ${HAVE_ERR}
#define HAVE_FTS ${HAVE_FTS}
#define HAVE_GETLINE ${HAVE_GETLINE}
#define HAVE_GETSUBOPT ${HAVE_GETSUBOPT}
#define HAVE_ISBLANK ${HAVE_ISBLANK}
#define HAVE_MKDTEMP ${HAVE_MKDTEMP}
#define HAVE_PLEDGE ${HAVE_PLEDGE}
#define HAVE_PROGNAME ${HAVE_PROGNAME}
#define HAVE_REALLOCARRAY ${HAVE_REALLOCARRAY}
#define HAVE_REWB_BSD ${HAVE_REWB_BSD}
#define HAVE_REWB_SYSV ${HAVE_REWB_SYSV}
#define HAVE_SANDBOX_INIT ${HAVE_SANDBOX_INIT}
#define HAVE_STRCASESTR ${HAVE_STRCASESTR}
#define HAVE_STRINGLIST ${HAVE_STRINGLIST}
#define HAVE_STRLCAT ${HAVE_STRLCAT}
#define HAVE_STRLCPY ${HAVE_STRLCPY}
#define HAVE_STRPTIME ${HAVE_STRPTIME}
#define HAVE_STRSEP ${HAVE_STRSEP}
#define HAVE_STRTONUM ${HAVE_STRTONUM}
#define HAVE_VASPRINTF ${HAVE_VASPRINTF}
#define HAVE_WCHAR ${HAVE_WCHAR}
#define HAVE_OHASH ${HAVE_OHASH}

#define BINM_APROPOS "${BINM_APROPOS}"
#define BINM_MAKEWHATIS "${BINM_MAKEWHATIS}"
#define BINM_MAN "${BINM_MAN}"
#define BINM_SOELIM "${BINM_SOELIM}"
#define BINM_WHATIS "${BINM_WHATIS}"

__HEREDOC__

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 *, ...);"
fi

[ ${HAVE_GETLINE} -eq 0 ] && \
	echo "extern	ssize_t	  getline(char **, size_t *, FILE *);"

[ ${HAVE_GETSUBOPT} -eq 0 ] && \
	echo "extern	int	  getsubopt(char **, char * const *, char **);"

[ ${HAVE_ISBLANK} -eq 0 ] && \
	echo "extern	int	  isblank(int);"

[ ${HAVE_MKDTEMP} -eq 0 ] && \
	echo "extern	char	 *mkdtemp(char *);"

if [ ${HAVE_PROGNAME} -eq 0 ]; then
	echo "extern 	const char *getprogname(void);"
	echo "extern	void	  setprogname(const char *);"
fi

[ ${HAVE_REALLOCARRAY} -eq 0 ] && \
	echo "extern	void	 *reallocarray(void *, size_t, size_t);"

[ ${HAVE_STRCASESTR} -eq 0 ] && \
	echo "extern	char	 *strcasestr(const char *, const char *);"

[ ${HAVE_STRLCAT} -eq 0 ] && \
	echo "extern	size_t	  strlcat(char *, const char *, size_t);"

[ ${HAVE_STRLCPY} -eq 0 ] && \
	echo "extern	size_t	  strlcpy(char *, const char *, size_t);"

[ ${HAVE_STRSEP} -eq 0 ] && \
	echo "extern	char	 *strsep(char **, const char *);"

[ ${HAVE_STRTONUM} -eq 0 ] && \
	echo "extern	long long strtonum(const char *, long long, long long, const char **);"

[ ${HAVE_VASPRINTF} -eq 0 ] && \
	echo "extern	int	  vasprintf(char **, const char *, va_list);"

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

# --- tests for Makefile.local -----------------------------------------

exec > Makefile.local

[ -z "${BINDIR}"     ] && BINDIR="${PREFIX}/bin"
[ -z "${SBINDIR}"    ] && SBINDIR="${PREFIX}/sbin"
[ -z "${INCLUDEDIR}" ] && INCLUDEDIR="${PREFIX}/include/mandoc"
[ -z "${LIBDIR}"     ] && LIBDIR="${PREFIX}/lib/mandoc"
[ -z "${MANDIR}"     ] && MANDIR="${PREFIX}/man"

[ -z "${HTDOCDIR}"   ] && HTDOCDIR="${WWWPREFIX}/htdocs"
[ -z "${CGIBINDIR}"  ] && CGIBINDIR="${WWWPREFIX}/cgi-bin"

[ -z "${INSTALL_PROGRAM}" ] && INSTALL_PROGRAM="${INSTALL} -m 0555"
[ -z "${INSTALL_LIB}"     ] && INSTALL_LIB="${INSTALL} -m 0444"
[ -z "${INSTALL_MAN}"     ] && INSTALL_MAN="${INSTALL} -m 0444"
[ -z "${INSTALL_DATA}"    ] && INSTALL_DATA="${INSTALL} -m 0444"

BUILD_TARGETS=
[ ${BUILD_CGI} -gt 0 ] && BUILD_TARGETS="cgi-build"
INSTALL_TARGETS=
[ ${BUILD_CGI} -gt 0 ] && INSTALL_TARGETS="cgi-install"

cat << __HEREDOC__
BUILD_TARGETS	= ${BUILD_TARGETS}
INSTALL_TARGETS	= ${INSTALL_TARGETS}
CC		= ${CC}
CFLAGS		= ${CFLAGS}
LDADD		= ${LDADD}
LDFLAGS		= ${LDFLAGS}
STATIC		= ${STATIC}
PREFIX		= ${PREFIX}
BINDIR		= ${BINDIR}
SBINDIR		= ${SBINDIR}
INCLUDEDIR	= ${INCLUDEDIR}
LIBDIR		= ${LIBDIR}
MANDIR		= ${MANDIR}
WWWPREFIX	= ${WWWPREFIX}
HTDOCDIR	= ${HTDOCDIR}
CGIBINDIR	= ${CGIBINDIR}
BINM_APROPOS	= ${BINM_APROPOS}
BINM_MAKEWHATIS	= ${BINM_MAKEWHATIS}
BINM_MAN	= ${BINM_MAN}
BINM_SOELIM	= ${BINM_SOELIM}
BINM_WHATIS	= ${BINM_WHATIS}
MANM_MAN	= ${MANM_MAN}
MANM_MANCONF	= ${MANM_MANCONF}
MANM_MDOC	= ${MANM_MDOC}
MANM_ROFF	= ${MANM_ROFF}
MANM_EQN	= ${MANM_EQN}
MANM_TBL	= ${MANM_TBL}
INSTALL		= ${INSTALL}
INSTALL_PROGRAM	= ${INSTALL_PROGRAM}
INSTALL_LIB	= ${INSTALL_LIB}
INSTALL_MAN	= ${INSTALL_MAN}
INSTALL_DATA	= ${INSTALL_DATA}
__HEREDOC__

echo "Makefile.local: written" 1>&2
echo "Makefile.local: written" 1>&3

exit 0