--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/c/err/err.h	Fri Oct 20 12:36:51 2017 +0200
@@ -0,0 +1,62 @@
+/*
+ * err.h -- formtted error messages (portable version)
+ *
+ * Copyright (c) 2011-2017 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.
+ */
+
+#ifndef ERR_H
+#define ERR_H
+
+#include <stdarg.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if defined(__GNUC__)
+#   define ERR_NORETURN __attribute__ ((noreturn))
+#elif defined(_MSC_VER)
+#   define ERR_NORETURN __declspec(noreturn)
+#endif
+
+void 
+err(int, const char *, ...) ERR_NORETURN;
+
+void
+verr(int, const char *, va_list) ERR_NORETURN;
+
+void
+errx(int, const char *, ...) ERR_NORETURN;
+
+void
+verrx(int, const char *, va_list) ERR_NORETURN;
+
+void
+warn(const char *, ...);
+
+void
+vwarn(const char *, va_list);
+
+void
+warnx(const char *, ...);
+
+void
+vwarnx(const char *, va_list);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ERR_H */