configure

#! /bin/sh
#
# Copyright (c) 2014, 2015, 2016 Ingo Schwarze <schwarze@openbsd.org>
# Copyright (c) 2017 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.

OCONFIGURE_VERSION="0.1.3"

#
# This script outputs two files: config.h and Makefile.configure.
# It tries to read from configure.local, which contains predefined
# values we won't autoconfigure.
#
# If you want to use configure with your project, have your GNUmakefile
# or BSDmakefile---whichever---try to import/include Makefile.configure
# at the beginning of the file.
#
# Like so (note no quotes, no period, etc.):
#
#   include Makefile.configure
#
# If it exists, configure was run; otherwise, it wasn't.
#
# You'll probably want to change parts of this file.  I've noted the
# parts that you'll probably change in the section documentation.
#
# See https://github.com/kristapsdz/oconfigure for more.

set -e

#----------------------------------------------------------------------
# Prepare for running: move aside previous configure runs.
# Output file descriptor usage:
#  1 (stdout): config.h or Makefile.configure
#  2 (stderr): original stderr, usually to the console
#  3: config.log
# You DO NOT want to change this.
#----------------------------------------------------------------------

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

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

#----------------------------------------------------------------------
# Initialize all variables here such that nothing can leak in from the
# environment except for CC and CFLAGS, which we might have passed in.
#----------------------------------------------------------------------

CC=`printf "all:\\n\\t@echo \\\$(CC)\\n" | make -sf -`
CFLAGS=`printf "all:\\n\\t@echo \\\$(CFLAGS)\\n" | make -sf -`
CFLAGS="${CFLAGS} -g -W -Wall -Wextra -Wmissing-prototypes -Wstrict-prototypes"
CFLAGS="${CFLAGS} -Wwrite-strings -Wno-unused-parameter"
LDADD=
CPPFLAGS=
LDFLAGS=
DESTDIR=
PREFIX="/usr/local"
BINDIR=
SBINDIR=
INCLUDEDIR=
LIBDIR=
MANDIR=
SHAREDIR=
INSTALL="install"
INSTALL_PROGRAM=
INSTALL_LIB=
INSTALL_MAN=
INSTALL_DATA=

#----------------------------------------------------------------------
# Allow certain variables to be overriden on the command line.
#----------------------------------------------------------------------

for keyvals in "$@"
do
	key=`echo $keyvals | cut -s -d '=' -f 1`
	if [ -z "$key" ]
	then
		echo "$0: invalid key-value: $keyvals" 1>&2
		exit 1
	fi
	val=`echo $keyvals | cut -d '=' -f 2-`
	case "$key" in
	LDADD)
		LDADD="$val" ;;
	LDFLAGS)
		LDFLAGS="$val" ;;
	CPPFLAGS)
		CPPFLAGS="$val" ;;
	DESTDIR)
		DESTDIR="$val" ;;
	PREFIX)
		PREFIX="$val" ;;
	MANDIR)
		MANDIR="$val" ;;
	LIBDIR)
		LIBDIR="$val" ;;
	BINDIR)
		BINDIR="$val" ;;
	SHAREDIR)
		SHAREDIR="$val" ;;
	SBINDIR)
		SBINDIR="$val" ;;
	INCLUDEDIR)
		INCLUDEDIR="$val" ;;
	*)
		echo "$0: invalid key: $key" 1>&2
		exit 1
	esac
done


#----------------------------------------------------------------------
# These are the values that will be pushed into config.h after we test
# for whether they're supported or not.
# Each of these must have a runtest(), below.
# Please sort by alpha, for clarity.
# You WANT to change this.
#----------------------------------------------------------------------

HAVE_ARC4RANDOM=
HAVE_CAPSICUM=
HAVE_ERR=
HAVE_EXPLICIT_BZERO=
HAVE_GETPROGNAME=
HAVE_INFTIM=
HAVE_MD5=
HAVE_MEMMEM=
HAVE_MEMRCHR=
HAVE_MEMSET_S=
HAVE_PATH_MAX=
HAVE_PLEDGE=
HAVE_PROGRAM_INVOCATION_SHORT_NAME=
HAVE_REALLOCARRAY=
HAVE_RECALLOCARRAY=
HAVE_SANDBOX_INIT=
HAVE_SECCOMP_FILTER=
HAVE_SOCK_NONBLOCK=
HAVE_STRLCAT=
HAVE_STRLCPY=
HAVE_STRTONUM=
HAVE_SYSTRACE=
HAVE___PROGNAME=

#----------------------------------------------------------------------
# Allow configure.local to override all variables, default settings,
# command-line arguments, and tested features, above.
# You PROBABLY DO NOT want to change this.
#----------------------------------------------------------------------

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

#----------------------------------------------------------------------
# Infrastructure for running tests.
# These consists of a series of functions that will attempt to run the
# given test file and record its exit into a HAVE_xxx variable.
# You DO NOT want to change this.
#----------------------------------------------------------------------

COMP="${CC} ${CFLAGS} ${CPPFLAGS} -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 "${3}" ] && return 1
	echo "${1}: manual (HAVE_${2}=${3})" 1>&2
	echo "${1}: manual (HAVE_${2}=${3})" 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, additional LIBS.

singletest() {
	cat 1>&3 << __HEREDOC__
${1}: testing...
${COMP} -DTEST_${2} ${3} -o test-${1} tests.c ${4}
__HEREDOC__

	if ${COMP} -DTEST_${2} ${3} -o "test-${1}" tests.c ${4} 1>&3 2>&3; then
		echo "${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}" "${2}" "${_manual}" && return 0
	singletest "${1}" "${2}" "${3}" "${4}" "${test}" && return 0
	echo "${1}: no" 1>&2
	eval HAVE_${2}=0
	return 1
}

#----------------------------------------------------------------------
# Begin running the tests themselves.
# All of your tests must be defined here.
# Please sort as the HAVE_xxxx values were defined.
# You WANT to change this.
#----------------------------------------------------------------------

runtest arc4random	ARC4RANDOM			  || true
runtest capsicum	CAPSICUM			  || true
runtest err		ERR				  || true
runtest explicit_bzero	EXPLICIT_BZERO			  || true
runtest getprogname	GETPROGNAME			  || true
runtest INFTIM		INFTIM				  || true
runtest md5		MD5				  || true
runtest memmem		MEMMEM			  	  || true
runtest memrchr		MEMRCHR			  	  || true
runtest memset_s	MEMSET_S			  || true
runtest PATH_MAX	PATH_MAX			  || true
runtest pledge		PLEDGE				  || true
runtest program_invocation_short_name	PROGRAM_INVOCATION_SHORT_NAME || true
runtest reallocarray	REALLOCARRAY			  || true
runtest recallocarray	RECALLOCARRAY			  || true
runtest sandbox_init	SANDBOX_INIT	"-Wno-deprecated" || true
runtest seccomp-filter	SECCOMP_FILTER			  || true
runtest SOCK_NONBLOCK	SOCK_NONBLOCK			  || true
runtest strlcat		STRLCAT				  || true
runtest strlcpy		STRLCPY				  || true
runtest strndup		STRNDUP				  || true
runtest strnlen		STRNLEN				  || true
runtest strtonum	STRTONUM			  || true
runtest systrace	SYSTRACE			  || true
runtest zlib		ZLIB		"" "-lz"	  || true
runtest __progname	__PROGNAME			  || true

#----------------------------------------------------------------------
# Output writing: generate the config.h file.
# This file contains all of the HAVE_xxxx variables necessary for
# compiling your source.
# You must include "config.h" BEFORE any other variables.
# You WANT to change this.
#----------------------------------------------------------------------

exec > config.h

# Start with prologue.

cat << __HEREDOC__
#ifdef __cplusplus
#error "Do not use C++: this is a C application."
#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
#if !defined(__BEGIN_DECLS)
# define __BEGIN_DECLS
#endif
#if !defined(__END_DECLS)
# define __END_DECLS
#endif
__HEREDOC__

# For the function declaration variables...

[ ${HAVE_MD5} -eq 0 -o \
  ${HAVE_REALLOCARRAY} -eq 0 -o \
  ${HAVE_RECALLOCARRAY} -eq 0 -o \
  ${HAVE_STRLCAT} -eq 0 -o \
  ${HAVE_STRLCPY} -eq 0 -o \
  ${HAVE_STRNDUP} -eq 0 -o \
  ${HAVE_STRNLEN} -eq 0 ] \
	&& echo "#include <sys/types.h>"

[ ${HAVE_ERR} -eq 0 ] \
	&& echo "#include <stdarg.h>"

# Now we handle our HAVE_xxxx values.
# Most will just be defined as 0 or 1.

[ ${HAVE_PATH_MAX} -eq 0 ] \
	&& echo "#define PATH_MAX 4096"

[ ${HAVE_INFTIM} -eq 0 ] \
	&& echo "#define INFTIM (-1)"

cat << __HEREDOC__
#define HAVE_ARC4RANDOM ${HAVE_ARC4RANDOM}
#define HAVE_CAPSICUM ${HAVE_CAPSICUM}
#define HAVE_ERR ${HAVE_ERR}
#define HAVE_EXPLICIT_BZERO ${HAVE_EXPLICIT_BZERO}
#define HAVE_GETPROGNAME ${HAVE_GETPROGNAME}
#define HAVE_INFTIM ${HAVE_INFTIM}
#define HAVE_MD5 ${HAVE_MD5}
#define HAVE_MEMMEM ${HAVE_MEMMEM}
#define HAVE_MEMRCHR ${HAVE_MEMRCHR}
#define HAVE_MEMSET_S ${HAVE_MEMSET_S}
#define HAVE_PATH_MAX ${HAVE_PATH_MAX}
#define HAVE_PLEDGE ${HAVE_PLEDGE}
#define HAVE_PROGRAM_INVOCATION_SHORT_NAME ${HAVE_PROGRAM_INVOCATION_SHORT_NAME}
#define HAVE_REALLOCARRAY ${HAVE_REALLOCARRAY}
#define HAVE_RECALLOCARRAY ${HAVE_RECALLOCARRAY}
#define HAVE_SANDBOX_INIT ${HAVE_SANDBOX_INIT}
#define HAVE_SECCOMP_FILTER ${HAVE_SECCOMP_FILTER}
#define HAVE_SOCK_NONBLOCK ${HAVE_SOCK_NONBLOCK}
#define HAVE_STRLCAT ${HAVE_STRLCAT}
#define HAVE_STRLCPY ${HAVE_STRLCPY}
#define HAVE_STRNDUP ${HAVE_STRNDUP}
#define HAVE_STRNLEN ${HAVE_STRNLEN}
#define HAVE_STRTONUM ${HAVE_STRTONUM}
#define HAVE_SYSTRACE ${HAVE_SYSTRACE}
#define HAVE_ZLIB ${HAVE_ZLIB}
#define HAVE___PROGNAME ${HAVE___PROGNAME}
__HEREDOC__

# Now we do our function declarations for missing functions.

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 *, ...);"
	echo "extern void vwarn(const char *, va_list);"
	echo "extern void vwarnx(const char *, va_list);"
fi

if [ ${HAVE_MD5} -eq 0 ]; then
	echo "#define MD5_BLOCK_LENGTH 64"
	echo "#define MD5_DIGEST_LENGTH 16"
	echo "#define MD5_DIGEST_STRING_LENGTH (MD5_DIGEST_LENGTH * 2 + 1)"
	cat <<!!
typedef struct MD5Context {
	u_int32_t state[4];
	u_int64_t count;
	u_int8_t buffer[MD5_BLOCK_LENGTH];
} MD5_CTX;
!!
	echo "extern void MD5Init(MD5_CTX *);"
	echo "extern void MD5Update(MD5_CTX *, const u_int8_t *, size_t);"
	echo "extern void MD5Pad(MD5_CTX *);"
	echo "extern void MD5Transform(u_int32_t [4], const u_int8_t [MD5_BLOCK_LENGTH]);"
	echo "extern char *MD5End(MD5_CTX *, char *);"
	echo "extern void MD5Final(u_int8_t [MD5_DIGEST_LENGTH], MD5_CTX *);";
fi

if [ ${HAVE_SECCOMP_FILTER} -eq 1 ]; then
	arch=`uname -m 2>/dev/null || echo unknown`
	case "$arch" in
		x86_64)
			echo "#define SECCOMP_AUDIT_ARCH AUDIT_ARCH_X86_64"
			;;
		i*86)
			echo "#define SECCOMP_AUDIT_ARCH AUDIT_ARCH_I386"
			;;
		arm*)
			echo "#define SECCOMP_AUDIT_ARCH AUDIT_ARCH_ARM"
			;;
	esac
fi

if [ ${HAVE_EXPLICIT_BZERO} -eq 0 ]; then
	echo "extern void explicit_bzero(void *, size_t);"
fi

if [ ${HAVE_MEMMEM} -eq 0 ]; then
	echo "void *memmem(const void *, size_t, const void *, size_t);"
fi

if [ ${HAVE_MEMRCHR} -eq 0 ]; then
	echo "void *memrchr(const void *b, int, size_t);"
fi

if [ ${HAVE_GETPROGNAME} -eq 0 ]; then
	echo "extern const char *getprogname(void);"
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_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_STRNDUP} -eq 0 ]; then
	echo "extern char *strndup(const char *, size_t);"
fi

if [ ${HAVE_STRNLEN} -eq 0 ]; then
	echo "extern size_t strnlen(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

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

#----------------------------------------------------------------------
# Now we go to generate our Makefile.configure.
# This file is simply a bunch of Makefile variables.
# They'll work in both GNUmakefile and BSDmakefile.
# You MIGHT want to change this.
#----------------------------------------------------------------------

exec > Makefile.configure

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

[ -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"

cat << __HEREDOC__
CC		= ${CC}
CFLAGS		= ${CFLAGS}
CPPFLAGS	= ${CPPFLAGS}
LDADD		= ${LDADD}
LDFLAGS		= ${LDFLAGS}
STATIC		= ${STATIC}
PREFIX		= ${PREFIX}
BINDIR		= ${BINDIR}
SHAREDIR	= ${SHAREDIR}
SBINDIR		= ${SBINDIR}
INCLUDEDIR	= ${INCLUDEDIR}
LIBDIR		= ${LIBDIR}
MANDIR		= ${MANDIR}
INSTALL		= ${INSTALL}
INSTALL_PROGRAM	= ${INSTALL_PROGRAM}
INSTALL_LIB	= ${INSTALL_LIB}
INSTALL_MAN	= ${INSTALL_MAN}
INSTALL_DATA	= ${INSTALL_DATA}
__HEREDOC__

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

exit 0