--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/err.c	Thu Sep 08 18:28:57 2011 +0200
@@ -0,0 +1,114 @@
+/*
+ * err.c -- formtted error messages (portable version)
+ *
+ * Copyright (c) 2011, David Demelier <markand@malikania.fr>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+#include <errno.h>
+
+#include "err.h"
+
+/*
+ * These functions implements at least the same functions that can be found
+ * in the NetBSD err(3) man page without printing the programe name due to
+ * a portability issue.
+ */
+
+void
+err(int val, const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	verr(val, fmt, ap);
+	va_end(ap);
+}
+
+void
+verr(int val, const char *fmt, va_list ap)
+{
+	if (fmt) {
+		vfprintf(stderr, fmt, ap);
+		fprintf(stderr, ": ");
+	}
+
+	fprintf(stderr, "%s\n", strerror(errno));
+	exit(val);
+}
+
+void
+errx(int val, const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	verrx(val, fmt, ap);
+	va_end(ap);
+}
+
+void
+verrx(int val, const char *fmt, va_list ap)
+{
+	if (fmt)
+		vfprintf(stderr, fmt, ap);
+
+	fprintf(stderr, "\n");
+
+	exit(val);
+}
+
+void
+warn(const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	vwarn(fmt, ap);
+	va_end(ap);
+}
+
+void
+vwarn(const char *fmt, va_list ap)
+{
+	if (fmt) {
+		vfprintf(stderr, fmt, ap);
+		fprintf(stderr, ": ");
+	}
+
+	fprintf(stderr, "%s\n", strerror(errno));
+}
+
+void
+warnx(const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	vwarnx(fmt, ap);
+	va_end(ap);
+}
+
+void
+vwarnx(const char *fmt, va_list ap)
+{
+	if (fmt)
+		vfprintf(stderr, fmt, ap);
+
+	fprintf(stderr, "\n");
+}