--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/utils.c	Sun Dec 19 16:51:57 2010 -0500
@@ -0,0 +1,100 @@
+/*-
+ * Copyright (c) 2010 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by David A. Holland.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <err.h>
+
+#include "utils.h"
+
+void *
+domalloc(size_t len)
+{
+	void *ret;
+
+	ret = malloc(len);
+	if (ret == NULL) {
+		warnx("Out of memory");
+		die();
+	}
+	return ret;
+}
+
+void *
+dorealloc(void *ptr, size_t len)
+{
+	void *ret;
+
+	ret = realloc(ptr, len);
+	if (ret == NULL) {
+		warnx("Out of memory");
+		die();
+	}
+	return ret;
+}
+
+char *
+dostrdup(const char *s)
+{
+	char *ret;
+	size_t len;
+
+	len = strlen(s);
+	ret = domalloc(len+1);
+	strcpy(ret, s);
+	return ret;
+}
+
+char *
+dostrdup2(const char *s, const char *t)
+{
+	char *ret;
+	size_t len;
+
+	len = strlen(s) + strlen(t);
+	ret = domalloc(len+1);
+	strcpy(ret, s);
+	strcat(ret, t);
+	return ret;
+}
+
+char *
+dostrdup3(const char *s, const char *t, const char *u)
+{
+	char *ret;
+	size_t len;
+
+	len = strlen(s) + strlen(t) + strlen(u);
+	ret = domalloc(len+1);
+	strcpy(ret, s);
+	strcat(ret, t);
+	strcat(ret, u);
+	return ret;
+}
+