#! /bin/sh
#
# Copyright (c) 2018-2020 Gavin D. Howard and contributors.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice, this
#   list of conditions and the following disclaimer.
#
# * Redistributions in binary form must reproduce the above copyright notice,
#   this list of conditions and the following disclaimer in the documentation
#   and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#

# Tests the timeconst.bc script from the Linux kernel build.
# You can find the script at kernel/time/timeconst.bc in any Linux repo.
# One such repo is: https://github.com/torvalds/linux

script="$0"
testdir=$(dirname "$script")

if [ "$#" -gt 0 ]; then
	timeconst="$1"
	shift
else
	timeconst="$testdir/scripts/timeconst.bc"
fi

if [ "$#" -gt 0 ]; then
	bc="$1"
	shift
else
	bc="$testdir/../../bin/bc"
fi

out1="$testdir/../.log_bc_timeconst.txt"
out2="$testdir/../.log_bc_timeconst_test.txt"

base=$(basename "$timeconst")

if [ ! -f "$timeconst" ]; then
	printf 'Warning: %s does not exist\n' "$timeconst"
	printf 'Skipping...\n'
	exit 0
fi

printf 'Running %s...' "$base"

nums=$(printf 'for (i = 0; i <= 1000; ++i) { i }\n' | bc)

for i in $nums; do

	printf '%s\n' "$i" | bc -q "$timeconst" > "$out1"

	err="$?"

	if [ "$err" -ne 0 ]; then
		printf '\nOther bc is not GNU compatible. Skipping...\n'
		exit 0
	fi

	printf '%s\n' "$i" | "$bc" "$@" -q "$timeconst" > "$out2"

	diff "$out1" "$out2"

	error="$?"

	if [ "$error" -ne 0 ]; then
		printf '\nFailed on input: %s\n' "$i"
		exit "$error"
	fi

done

rm -f "$out1"
rm -f "$out2"

printf 'pass\n'