intcmp(1): new tool; npc(1): new tool; scrut(1): new tool; str(1): new tool; strcmp(1): new tool; tests: added POSIX compatibility test and C compiler compatibility test; Makefile: converted to GNUmakefile; README: added README; docs: added docs

tests/posix/test

@@ -0,0 +1,19 @@
+#!/bin/sh
+
+# Copyright (c) 2023 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.
+
+set -e
+
+i=1
+while test -e "$i".test; do
+	printf '%s: %s: Running test...\n' "$0" "$i".test
+	./"$i".test >"$i".result
+	diff 1.expected 1.result
+	printf '%s: %s: Test passed.\n' "$0" "$i".test
+	i="$(printf '%s + %s\n' 1 "$i" | bc)"
+done