#!/usr/bin/env make
# Copyright (c) 2024 DTB <trinity@trinity.moe>
# SPDX-License-Identifier: FSFAP
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice and this
# notice are preserved.  This file is offered as-is, without any warranty.

BIN = build/bin
MAKE = make -B

DEFENDANTS = dj false intcmp strcmp true
.PHONY: all $(DEFENDANTS)
all: $(DEFENDANTS)

$(BIN)/dj:
	$(MAKE) dj

$(BIN)/false:
	$(MAKE) false

$(BIN)/intcmp:
	$(MAKE) intcmp

$(BIN)/strcmp:
	$(MAKE) strcmp

$(BIN)/true:
	$(MAKE) true

dj: $(BIN)/dj $(BIN)/strcmp
	sh -c "! $(BIN)/dj -h"
	# This test is theoretically Linux-dependent; write(2) should return -1 on
	# error.
	# Right now dj(1) interprets the return value of write(2) as the amount of
	# bytes written. This can decrement the stored quantity of bytes written,
	# which is an int, so doesn't underflow but goes negative. dj(1) tries to
	# again to write(2) if an error occurs in which no bytes are written, so in
	# total two write(2)s are attempted and so the written byte quantity is -2.
	# This is a bug and will change, but for now is at least documented.
	sh -ec "\
		$(BIN)/dj -Hi /dev/zero -o /dev/full \
		| xargs -I out $(BIN)/strcmp '1+0 > 0+0; 1024 > -2' out"
	# Read nothing from /dev/null, write nothing to /dev/null.
	sh -ec "\
		$(BIN)/dj -Hi /dev/null -o /dev/null \
		| xargs -I out $(BIN)/strcmp '0+0 > 0+0; 0 > 0' out"

false: $(BIN)/false
	sh -c "! $(BIN)/false"
	sh -c "! $(BIN)/false -h"

intcmp: $(BIN)/intcmp
	$(BIN)/intcmp -e   3 3 3
	$(BIN)/intcmp -g   3 2 1
	$(BIN)/intcmp -l   1 2 3
	$(BIN)/intcmp -ge  3 3 1
	$(BIN)/intcmp -le  1 3 3
	$(BIN)/intcmp -gl  1 2 3
	$(BIN)/intcmp -egl 3 1 1 2
	sh -c "! $(BIN)/intcmp -e   1 2 3"
	sh -c "! $(BIN)/intcmp -g   1 3 3"
	sh -c "! $(BIN)/intcmp -l   3 3 1"
	sh -c "! $(BIN)/intcmp -ge  1 2 3"
	sh -c "! $(BIN)/intcmp -le  3 2 1"
	sh -c "! $(BIN)/intcmp -gl  3 3 3"
	sh -c "! $(BIN)/intcmp -egl foo"

strcmp: $(BIN)/strcmp
	$(BIN)/strcmp equals equals
	sh -c "! $(BIN)/strcmp inequals equals"
	$(BIN)/strcmp - -
	sh -c "! $(BIN)/strcmp -h"
	sh -c "! $(BIN)/strcmp nocmp"

true:
	$(BIN)/true
	$(BIN)/true -h