#!/bin/sh

# This configure script has been written by Han Boetes
# <han@mijncomputer.nl> and is released in public domain.

add_inc()
{
    echo "#define $1" >> config.h
}

note()
{
    echo -n "Looking for $@...  "
    echo    "Looking for $@...  " >&3
}

case $1 in
    -*)
	echo "No help and options available. Just run ./configure"
	exit 0;
	;;
esac


# initial config.h. I think this can be more customizable.

# (Common) compile-time options:
#
#	STARTUP		-- look for and handle initialization file
#	FKEYS		-- add support for function key sequences.
#	XKEYS		-- use termcap function key definitions.
#                          Warning: XKEYS and bsmap mode do _not_ get along.
#	PREFIXREGION	-- enable function "prefix-region"
#	REGEX		-- create regular expression functions

cat << EOF > config.h
#define FKEYS
#define PREFIXREGION
#define REGEX
#define XKEYS
EOF

exec 3> config.log

note 'internal arc4random'
cat << EOF > testfile.c
#include <stdlib.h>
int main(void)
{arc4random();return 0;}
EOF
if gcc testfile.c -o testfile 2>&3; then
    echo Found.
    add_inc HAVE_ARC4RANDOM
else
    echo Not Found.
    note 'external arc4random'
    cat << EOF > testfile.c
#include <stdlib.h>
#include <arc4random.h>
int main(void)
{arc4random();return 0;}
EOF
    if gcc -larc4random testfile.c -o testfile 2>&3; then
	echo Found.
	add_inc HAVE_ARC4RANDOM_EXT
	extralibs="$extralibs -larc4random"
    else
	echo Not Found.
    fi
fi

note 'strtonum'
cat << EOF > testfile.c
#include <stdlib.h>
#include <limits.h>
int main(void)
{strtonum(NULL, 1, 1, NULL);return 0;}
EOF
if gcc testfile.c -o testfile 2>&3; then
    echo 'Found.'
else
    echo 'Not Found, adding.'
    add_inc HAVE_NOSTRTONUM
    extraobjs="$extraobjs strtonum.o"
fi


note 'strlcpy'
cat << EOF > testfile.c
#include <string.h>
int main(void)
{strlcpy(NULL, NULL, 1);return 0;}
EOF
if gcc testfile.c -o testfile 2>&3; then
    echo 'Found.'
else
    echo 'Not Found, adding.'
    add_inc HAVE_NOSTRLCPY
    extraobjs="$extraobjs strlcpy.o"
fi

note 'strlcat'
cat << EOF > testfile.c
#include <string.h>
int main(void)
{strlcat(NULL, NULL, 1);return 0;}
EOF
if gcc -Wall testfile.c -o testfile 2>&3; then
    echo 'Found.'
else
    echo 'Not Found, adding.'
    add_inc HAVE_NOSTRLCAT
    extraobjs="$extraobjs strlcat.o"
fi

note 'fgetln'
cat << EOF > testfile.c
#include <stdio.h>
int main(void)
{fgetln(NULL, NULL);return 0;}
EOF
if gcc -Wall testfile.c -o testfile 2>&3; then
    echo 'Found.'
else
    echo 'Not Found, adding.'
    add_inc HAVE_NOFGETLN
    extraobjs="$extraobjs fgetln.o"
fi

# With -O2 or higher you get a warning for strict-aliasing on
# some versions of gcc.
echo -n 'Testing for strict aliasing...  '
echo 'Testing for strict aliasing...  ' >&3
cat << EOF > testfile.c
int main(void)
{return 0;}
EOF
if gcc -Wno-strict-aliasing testfile.c -o testfile 2>&3; then
    echo 'Works OK.'
    extraflags="$extraflags -Wno-strict-aliasing"
else
    echo 'Fails.'
fi


if [ ! -r /usr/include/term.h ]; then
    note 'term.h'
    for i in pkg local; do
	if [ -e /usr/$i/include/term.h ]; then
	    echo "Found in /usr/$i/include"
	    extralibs="$extralibs -L/usr/$i/lib"
	    extraflags="$extraflags -I/usr/$i/include"
	    break
	fi
	echo 'Not found!'
	echo 'If you know where term.h is, please email the author!'
	exit 1
    done
fi

note 'glibc'
cat << EOF > testfile.c
#include <stdio.h>
int main(void)
{
#ifdef __GLIBC__
garbage that will make gcc fail
#endif
return 0;}
EOF
if gcc -Wall testfile.c -o testfile 2>&3; then
    echo 'Not on this system'
else
    echo 'found, adding base and dirname.'
    extraobjs="$extraobjs dirname.o basename.o"
fi


note 'version'
if ls --version > testfile.o 2>&3; then
    echo 'GNU ls'
    add_inc GNU_LS
else
    echo 'Other ls'
fi


rm testfile*

sed -e "s|@extraflags@|$extraflags|" \
    -e "s|@extralibs@|$extralibs|" \
    -e "s|@extraobjs@|$extraobjs|" \
    Makefile.in > Makefile

echo "OK, now run \`make'."