--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/util.c	Sat Mar 15 18:41:03 2014 +0100
@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2014 Guido Berhoerster <guido+rantaiwarna@berhoerster.name>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#define	_XOPEN_SOURCE	600
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <errno.h>
+#include <curses.h>
+#include <term.h>
+#include <stdarg.h>
+
+#include "util.h"
+#include "compat.h"
+#include "rantaiwarna.h"
+
+void
+restore_term(void) {
+	if (curses_init) {
+		endwin();
+		curses_init = FALSE;
+		curs_set(1);
+	}
+}
+
+void
+rantaiwarna_err(int eval, const char *fmt, ...)
+{
+	int	saved_errno = errno;
+	va_list	args;
+
+	restore_term();
+
+	fprintf(stderr, "%s: ", progname);
+	va_start(args, fmt);
+	if (fmt != NULL) {
+		vfprintf(stderr, fmt, args);
+		fprintf(stderr, ": ");
+	}
+	va_end(args);
+	fprintf(stderr, "%s\n", strerror(saved_errno));
+
+	exit(eval);
+}
+
+void
+rantaiwarna_errx(int eval, const char *fmt, ...)
+{
+	va_list	args;
+
+	restore_term();
+
+	fprintf(stderr, "%s: ", progname);
+	va_start(args, fmt);
+	if (fmt != NULL) {
+		vfprintf(stderr, fmt, args);
+	}
+	va_end(args);
+	fputc('\n', stderr);
+
+	exit(eval);
+}
+
+void *
+rantaiwarna_malloc(size_t size)
+{
+	void	*ptr;
+
+	ptr = malloc(size);
+	if (ptr == NULL) {
+		rantaiwarna_err(1, NULL);
+	}
+	return (ptr);
+}
+
+void *
+rantaiwarna_calloc(size_t nelem, size_t elsize)
+{
+	void	*ptr;
+
+	ptr = calloc(nelem, elsize);
+	if (ptr == NULL) {
+		rantaiwarna_err(1, NULL);
+	}
+	return (ptr);
+}
+
+uint32_t
+rantaiwarna_rand(uint32_t *seed)
+{
+	uint32_t	x = *seed;
+
+	x ^= x << 13;
+	x ^= x >> 17;
+	x ^= x << 5;
+	*seed = x;
+
+	return (x);
+}