#!/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.
#	REGEX		-- create regular expression functions

cat << EOF > config.h
#define FKEYS
#define REGEX
#define XKEYS
#ifndef LOGIN_NAME_MAX
#define MAXLOGNAME _POSIX_LOGIN_NAME_MAX
#endif
#ifndef MAXLOGNAME
#define MAXLOGNAME LOGIN_NAME_MAX
#endif
EOF

exec 3> config.log

# Checks to see if GCC defines a given macro and returns true if it does.
gcc_defines()
{
    DEFSTR=$1

    cat << EOF > testfile.c
#include <stdio.h>
int main(void)
{
#ifdef ${DEFSTR}
garbage that will make gcc fail
#endif
return 0;}
EOF
    ! ${CC:-gcc} -Wall testfile.c -o testfile 2>&3
}

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


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

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

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


if [ ! -r /usr/include/term.h ]; then
    note 'term.h'
    if [ -r /usr/include/ncurses/term.h ]; then
	echo "Found in /usr/include/ncurses"
	extraflags="$extraflags -I/usr/include/ncurses"
    else
	for i in pkg local; do
	    if [ -r /usr/$i/include/term.h ]; then
		echo "Found in /usr/$i/include"
		extralibs="$extralibs -L/usr/$i/lib"
		extraflags="$extraflags -I/usr/$i/include"
		break
	    else
		false
	    fi
	done ||
	{
	    echo 'Not found!' >&2
	    echo 'Do you have the ncurses devel package installed?' >&2
	    echo 'If you know where term.h is, please email the author!' >&2
	    exit 1
	}
    fi
fi

note 'base and dirname'
if gcc_defines "__GLIBC__" || gcc_defines "__CYGWIN__" ; then
    echo 'Not present, adding.'
    extraobjs="$extraobjs dirname.o basename.o"
else
    echo 'Present on this system.'
fi

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

note '.exe extension'
cat << EOF > testfile.c
int main(void)
{return 0;}
EOF
if ${CC:-gcc} -Wall testfile.c -o testfile 2>&3; then
    if [ -x testfile.exe ]; then
	echo 'Yes.'
	exe_ext='.exe'
    else
	echo 'No.'
	exe_ext=''
    fi
else
    echo 'Could not test for .exe extension!' >&2
    exit 1
fi

# Suppress DLL auto-import error when linking on Cygwin
if uname -s | grep -q '^CYGWIN' ; then
    extralibs="$extralibs -Wl,--enable-auto-import -Wno-char-subscripts"
fi


rm testfile*

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

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